The present invention relates to wellbore tools. More specifically, the invention relates to a debris collection tool utilizing magnets to collect metallic debris in a wellbore.
Many operations in an oil or gas well often produce a variety of debris in the wellbore. For example, milling operations may produce metallic mill cuttings, which may not be completely removed by simple circulation of fluid in the wellbore. Retrieval tools containing magnets have been used to collect magnetic debris in wellbores. Magnetic retrieval tools typically have magnets disposed on the exterior of the tool. Having the magnets continuously attracting metallic objects is problematic because there are times when it is desired for the tool to be non-attractive to debris, such as during run-in. Some tools have electromagnets that can be turned on and off remotely from the surface. These are unreliable and may require a source of power downhole. Additionally, having magnets exposed even when not in use increases the chance of damage and malfunction.
There is a need, therefore, for an improved magnetic debris retrieval tool for retrieving debris from the wellbore.
The present disclosure generally relates to a debris collection tool that can be used in a wellbore. In one embodiment, a debris collection tool includes a mandrel having a longitudinal flowbore therethrough and an inner sleeve disposed around the mandrel. A first array of magnets is arranged on the inner sleeve. A second array of magnets is disposed around the inner sleeve. The debris collection tool further includes an adaptor sleeve concentric with the mandrel and a linkage coupling the adaptor sleeve with the inner sleeve.
In another embodiment, a debris collection tool includes a mandrel having a longitudinal flowbore therethrough and an inner sleeve disposed around the mandrel. A first array of magnets is arranged on the inner sleeve. The first array of magnets includes a plurality of inner magnets disposed around a circumference of the inner sleeve. The inner sleeve has a longitudinal groove between two adjacent magnets of the first array of magnets. The debris collection tool further includes a second array of magnets disposed around the inner sleeve. The second array of magnets includes an annular arrangement of magnets between a pair of axially spaced end bands and a bridge between two circumferentially adjacent magnets. The bridge is configured to project into the longitudinal groove.
In another embodiment, a magnet assembly includes first and second annular end bands and an annular arrangement of magnets disposed between the first and second annular end bands. The first and second annular end bands include substantially a non-magnetic material. The magnet assembly further includes a plurality of bridges. Each bridge is disposed between the first and second annular end bands and between circumferentially adjacent magnets of the annular arrangement of magnets. The bridges include substantially a magnetic material.
In another embodiment, a controller for a wellbore tool includes a first housing defining a first chamber, and a second housing coupled to the first housing and defining a second chamber. The controller further includes a valve block separating the first and second chambers. A piston is axially movable within the first chamber. A sleeve is coupled to the piston, and extends from the first chamber into the second chamber through the valve block. A fastener is coupled to sleeve and coupled to the second housing. The controller further includes a central longitudinal flowbore through the sleeve and the piston. A first bore through the valve block fluidically couples an annulus between the sleeve and the first housing with the second chamber, and a check valve is associated with the first bore. A second bore through the valve block fluidically couples an annulus between the sleeve and the first housing with the second chamber, and a stop valve is associated with the second bore.
So that the manner in which the above recited features of the present disclosure can be understood in detail, a more particular description of the disclosure, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only exemplary embodiments and are therefore not to be considered limiting of its scope, may admit to other equally effective embodiments.
To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements that are common to the figures. It is contemplated that elements and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
The present disclosure relates to a debris collection tool for retrieving metallic debris from a wellbore. The debris collection tool may have magnets, and may use magnetic fields to attract metallic debris. The debris collection tool may be switched between an inactive configuration, in which the magnetic fields emanating from the debris collection tool are relatively weak, and an activated configuration, in which the magnetic fields emanating from the debris collection tool are relatively strong.
The debris collection tool may include components or materials that are deemed to be “magnetic” or “non-magnetic.” A materials that is termed “non-magnetic” has a low relative magnetic permeability, whereas a material that is termed “magnetic” has a high relative magnetic permeability. Magnetic permeability is a measure of the ability of a material to support the formation of magnetic fields. Relative magnetic permeability is the ratio of the magnetic permeability of the particular material to the magnetic permeability of free space (i.e. a vacuum), and is denoted by the equation:
μr=μ/μ0
where μr is the relative magnetic permeability of the material, μ is the actual magnetic permeability of the material, and μ0 is the actual magnetic permeability of free space.
Table 1 provides some example values of relative magnetic permeability for selected materials.
Table 1 shows that 99.95% pure iron annealed in hydrogen has a higher relative magnetic permeability than 99.8% pure iron, which has a higher relative magnetic permeability than nickel, which has a higher relative magnetic permeability than aluminum and wood. Thus, as used herein, the terms “magnetic” and “non-magnetic” may be considered as relative terms.
In some embodiments the upper housing 1002 may be omitted. In some embodiments the upper centralizer 1004 may be omitted. In some embodiments the lower housing 1016 may be omitted. In some embodiments, the lower centralizer 1018 may be omitted. The debris collection tool 1000 may be configured to be connected to other tools and/or a workstring at the bulkhead 1006 or, if present, the upper housing 1002. The debris collection tool 1000 may have a central longitudinal flowbore 1020 that continues from an upper end of the upper housing 1002, through the mandrel 1008, and down to a lower end of the lower housing 1016. The debris collection tool 1000 may be configured to be connected to other tools and/or a workstring at the lower bonnet 1014 or, if present, the lower housing 1016.
Each pair of circumferentially adjacent outer magnets 1038 of a ring 1036 of outer magnets 1038 may be separated by a bridge 1040. Each outer magnet 1038 may be circumferentially adjacent to a bridge 1040 at the outer magnet's 1038 North pole and another bridge 1040 at the outer magnet's 1038 South pole. Hence the ring 1036 of outer magnets 1038 may include a circumferentially aligned sequence of components in which the components form an alternating sequence of outer magnet 1038, bridge 1040, outer magnet 1038, bridge 1040, and so on. Each bridge 1040 may be formed from a magnetic material, such as a grade of steel that has a relatively high relative magnetic permeability. In some embodiments, one or more bridge 1040 may be sized to extend radially inwardly of the ring 1036 of outer magnets 1038.
Successive rings 1036 of outer magnets 1038 may be axially aligned to form the outer magnet array 1024. Each outer magnet 1038 within a ring 1036 of outer magnets 1038 may be axially aligned with a corresponding outer magnet 1038 of an adjacent ring 1036 of outer magnets 1038. Hence, the outer magnets 1038 may be aligned in rows in addition to being aligned circumferentially. Additionally, each bridge 1040 within a ring 1036 of outer magnets 1038 may be axially aligned with a corresponding bridge 1040 of an adjacent ring 1036 of outer magnets 1038. Hence, the bridges 1040 may be aligned in rows in addition to being aligned circumferentially.
Each outer magnet 1038 may include a magnetic material. Some example magnetic materials may include, without limitation, ceramic ferrite, neodymium iron boron, samarium cobalt, and aluminum nickel cobalt. The magnetic material may be encased in a non-magnetic material, such as stainless steel, for the physical and chemical protection of the magnetic material.
In some embodiments, the adaptor sleeve 1044 may be coupled to an adaptor assembly 1060. In some embodiments, the adaptor assembly 1060 may be omitted. In some embodiments, the adaptor assembly 1060 may be configured to couple the adaptor sleeve 1044 to a tool positioned close to the debris collection tool 1000. The tool positioned close to the debris collection tool 1000 may be a controller, such as any of the controllers 1106 depicted in
As illustrated in
The inner magnets 1076 may be arranged such that the poles of each inner magnet 1076 are aligned with a circumference of the corresponding ring 1078 of inner magnets 1076 to which each magnet belongs. The inner magnets 1076 may be arranged within each ring 1078 such that the North pole of one inner magnet 1076 is facing the North pole of a neighboring inner magnet 1076. Similarly, the South pole of one inner magnet 1076 may be facing the South pole of another neighboring inner magnet 1076.
Each inner magnet 1076 may include a magnetic material. Some example magnetic materials may include, without limitation, ceramic ferrite, neodymium iron boron, samarium cobalt, and aluminum nickel cobalt. The magnetic material may be encased in a non-magnetic material, such as stainless steel, for the physical and chemical protection of the magnetic material.
The adaptor piston 1062 may have one or more seal 1081 that contacts an inner wall 1082 of the upper housing 1002. The upper housing 1002 and/or the upper centralizer 1004 may have one or more port 1084 that fluidically couples an interior portion 1086 of the upper housing 1002 with an exterior of the upper housing 1002. The adaptor piston 1062 may be positioned below the port 1084. Thus, the adaptor piston 1062 may separate the interior portion 1086 of the upper housing that has a direct fluidic connection with an exterior of the upper housing 1002 from an activation chamber 1088 that does not have a direct fluidic connection with an exterior of the upper housing 1002.
Still with
A yoke 1056 of a linkage 1046 assembly is shown coupled to the adaptor sleeve 1044, and situated in the activation chamber 1088 of the upper housing 1002. In some embodiments, as shown in
In
As shown in
The lower bonnet 1014 may be constructed out of a non-magnetic material, such as a stainless steel. A lower shield 1026 is shown within an upper portion of the lower bonnet 1014. In some embodiments, the lower shield 1026 may be omitted. When present, the lower shield 1026 may be constructed out of a magnetic material, such as a magnetic grade of steel. In some embodiments, the lower shield 1026 may be sized to have a length corresponding to a length of a ring 1078 of inner magnets 1076. In some embodiments, the lower shield 1026 may be sized to have a length that is greater than a length of a ring 1078 of inner magnets 1076. An annular gap between an inner surface of the lower shield 1026 and an outer surface of the inner sleeve 1042 may be sized such that the annular gap may accommodate a ring 1078 of inner magnets 1076. When a ring 1078 of inner magnets 1076 is radially aligned with the lower shield 1026, the lower shield 1026 may inhibit the transmission of a magnetic field from the ring 1078 of inner magnets 1076 through the lower bonnet 1014. Thus, magnetic debris will not be prone to accumulate around the lower bonnet 1014, thereby mitigating a risk of the debris collection tool 1000 becoming stuck in a wellbore due to debris accumulation around the lower bonnet 1014.
As shown in
In some embodiments, a first ring 1078 of inner magnets 1076 may be positioned within the lower shield 1026. In some embodiments, the inner magnet array 1048 may have one ring 1078 of inner magnets 1076 additional to the number of rings 1036 of outer magnets 1038 of the outer magnet array 1024. Hence, a debris collection tool 1000 may include n rings 1036 of outer magnets 1038 and n+1 rings 1078 of inner magnets 1076. In some embodiments, each outer magnet 1038 of the outer magnet array 1024 may be adjacent to, and radially aligned with, a corresponding inner magnet 1076 of the inner magnet array 1048. Thus, each outer magnet 1038 of a first ring 1036 of outer magnets 1038 may be radially adjacent to a corresponding inner magnet 1076 of a second ring 1078 of inner magnets 1076, and so on, such that each outer magnet 1038 of the last (nA) ring 1036 of outer magnets 1038 may be radially adjacent to a corresponding inner magnet 1076 of the last (n+1th) ring 1078 of inner magnets 1076.
Returning to
The annular space between the lower bonnet 1014 and the mandrel 1008 may be exposed to a pressure external to the debris collection tool 1000 through port 1102. The floating piston 1028 may move within the annular space between the lower bonnet 1014 and the mandrel 1008 in order to balance a pressure within the sealed compartment with a pressure external to the debris collection tool 1000. Further, in
With reference to
Still referring to
With reference to
As illustrated in
For the purposes of illustration, the ring 1036 of outer magnets 1038 in
Consistent with the ring 1078 of inner magnets 1076 in
As illustrated in
As shown in
In use, the debris collection tool 1000 may be coupled to a workstring. In some embodiments, the debris collection tool 1000 may be coupled to a workstring to which one or more additional tool may be coupled. The additional tool(s) may include, without limitation, any one or more of a cutting tool, a scraping tool, a perforating tool, a drilling tool, a milling tool, a motor, an explosive tool, a jetting tool, a filter tool, a circulation diverting tool, a packer, a packer setting tool, a bridge plug, a bridge plug setting tool, a liner expansion tool, a cementing tool, a pressure testing tool, an inflow testing tool, a pressure surge mitigation tool, a seat for a ball or dart, a catcher for a ball or dart, a fishing tool, a disconnect tool, a data gathering tool, a data recording tool, a telemetry tool, or combination(s) thereof.
The workstring with the debris collection tool 1000 may be inserted into a wellbore. As shown in
As described above, the debris collection tool 1000 may be transitioned to the activated configuration by the application of pressure in the central longitudinal flowbore 1020. Such pressurizing may be achieved by pumping a fluid through the workstring into the central longitudinal flowbore 1020. The pressurizing may be assisted by pumping the fluid through a nozzle below the debris collection tool 1000, such that the flow of the fluid through the nozzle creates a back pressure that is experienced in the central longitudinal flowbore 1020. The pressurizing may be assisted by landing a blocking object, such as a ball or a dart, on a seat below the activation chamber 1088 of the debris collection tool 1000. The seat may be part of the debris collection tool 1000, or may be positioned below the debris collection tool 1000. The blocking object may substantially obstruct the passage of fluid therearound, and thus further pumping of fluid after the blocking object lands on the seat will increase the pressure in the workstring and in the longitudinal flowbore of the debris collection tool 1000.
Once transitioned into the activated configuration, the debris collection tool 1000 may now attract magnetic particles 1158 to the debris collection zone 1096, as shown in
The debris collection tool 1000 may be coupled to a controller for use in a wellbore 1156.
In some embodiments, the controller 1106 may selectively prevent or allow movement of the adaptor sleeve 1044, thereby selectively preventing or allowing the debris collection tool 1000 to transition between inactive and activated configurations. The controller 1106 may switch between preventing and allowing the debris collection tool 1000 to transition between inactive and activated configurations upon being triggered. In some embodiments, the controller 1106 may be triggered by landing a dropped object on a seat, such as per a controller depicted in U.S. Pat. No. 8,540,035, the disclosure of which is incorporated herein by reference.
In some embodiments, the controller 1106 may be triggered by telemetry of a signal. The signal may be conveyed to the controller 1106 by any one of: a RFID tag; electronically through a wire; electromagnetically; acoustically through a fluid, such as a fluid pressure pulse; acoustically through the workstring or a casing of a wellbore 1156; fluid flow modulation; workstring manipulation, such as rotation and/or axial movement; or combination(s) thereof. The controller 1106 may operate similarly to any of the controllers depicted in U.S. Pat. Nos. 8,540,035; 9,115,573; 9,382,769; and 10,087,725; the disclosures of which are incorporated herein by reference.
Hence, the debris collection tool 1000 may be maintained in the inactive configuration by the controller 1106 even if the debris collection tool 1000 experiences a pressure in the longitudinal flowbore that otherwise would be sufficient to trigger the debris collection tool 1000 to transition into the activated configuration. Therefore, the controller 1106 may prevent premature activation of the debris collection tool 1000 while other operations (such as cutting, scraping, milling, packer setting, pressure testing, fishing, etc.) are being conducted using the workstring and any other tools coupled to the workstring. When it is desired to activate the debris collection tool 1000, the controller 1106 may be prompted by any of the techniques described above and in the above-cited references to permit upward movement of the adaptor sleeve 1044, and any attached components of the adaptor assembly 1060. Then, the application of sufficient pressure in the longitudinal flowbore of the debris collection tool 1000 may activate the debris collection tool 1000, as described above.
Turning to
The piston housing 1112 may have a piston chamber 1118. A control piston 1120 may be located inside the piston chamber 1118. One or more seal 1121 may inhibit the passage of fluid between the control piston 1120 and an inner wall of the piston chamber 1118. The control piston 1120 may be positioned proximate to a lower end of the piston chamber 1118. A biasing member 1122, such as a spring, may inhibit the control piston 1120 from moving axially away from the lower end of the piston chamber 1118. The control piston 1120 may be coupled to a piston sleeve 1124 that extends from the control piston 1120, through the piston chamber 1118, and into the block housing 1110. In some embodiments, the control piston 1120 and the piston sleeve 1124 may be integrally formed. The control piston 1120 may be coupled to an extension sleeve 1126 that extends from the control piston 1120 into the bottom sub 1116. In some embodiments, the control piston 1120 and the extension sleeve 1126 may be integrally formed. The adaptor sleeve 1044 of the debris collection tool 1000 may be coupled to the extension sleeve 1126. The adaptor sleeve 1044 may be coupled to the extension sleeve 1126 in a similar manner to the coupling between the adaptor sleeve 1044 and the adaptor skirt 1064, illustrated in
In some alternative embodiments, the adaptor sleeve 1044 may be coupled to the adaptor extension 1068, and the adaptor extension 1068 may be coupled to the extension sleeve 1126. The adaptor sleeve 1044 may be coupled to the adaptor extension 1068 in a similar manner to the coupling between the adaptor sleeve 1044 and the adaptor skirt 1064, illustrated in
As illustrated in
As illustrated in
The portion of the piston chamber 1118 above the control piston 1120 and between an external surface of the piston sleeve 1124 and an internal surface of the piston housing 1112, may contain a control fluid, such as a hydraulic oil. The piston chamber 1118 may be bounded at an upper end by a valve block 1130 of the block housing 1110. The valve block 1130 may separate the piston chamber 1118 from an upper chamber 1134 of the block housing 1110. A transfer bore 1132 in the valve block 1130 may provide a fluid pathway between the piston chamber 1118 and the upper chamber 1134. The transfer bore 1132 may have a check valve 1136. The check valve 1136 may allow the passage of control fluid from the piston chamber 1118 to the upper chamber 1134, but inhibit the passage of control fluid from the upper chamber 1134 to the piston chamber 1118. A reset bore 1138 in the valve block 1130 may provide a fluid pathway between the piston chamber 1118 and the upper chamber 1134. The reset bore 1138 may have a stop valve 1140. The stop valve 1140 may be adjustable to selectively allow or inhibit the passage of control fluid from the piston chamber 1118 to the upper chamber 1134, and the passage of control fluid from the upper chamber 1134 to the piston chamber 1118. In some embodiments, the stop valve 1140 may be a removable plug.
The upper chamber 1134 may contain a balance piston 1142. The balance piston 1142 may be sealed against an inner surface of the block housing 1110 and an outer surface of the piston sleeve 1124 that extends through the block housing 1110, and therefore separates the upper chamber 1134 into upper and lower portions. Hence, the transfer bore 1132 and the reset bore 1138 of the valve block 1130 may be fluidically coupled with the lower portion of the upper chamber 1134. The block housing 1110 may have a port 1144 that allows the pressure of fluid external to the block housing 1110 to be communicated to the upper portion of the upper chamber 1134.
A piston block 1146 may be coupled to and around the piston sleeve 1124 within the upper chamber 1134. The piston block 1146 may be configured to move axially as a result of the piston sleeve 1124 moving axially. The piston block 1146 may be temporarily retained in a first position by a fastener 1148, such as a latch, locking dog, collet, snap ring, shear ring, shear screw, shear pin, or the like. The fastener 1148 may temporarily secure the piston block 1146 to the block housing 1110. Thus, the piston block 1146, piston sleeve 1124, control piston 1120, and extension sleeve 1126 may be temporarily inhibited from moving axially. As a result of this, the adaptor sleeve 1044 may be temporarily inhibited from moving axially, and therefore the debris collection tool 1000 may be temporarily maintained in the inactive configuration. In some embodiments, the fastener 1148 may be omitted. Nevertheless, the piston block 1146, piston sleeve 1124, control piston 1120, and extension sleeve 1126 may be temporarily inhibited from moving axially upward because of a downward force produced by the biasing member 1122 and the pressure of the control fluid in the piston chamber 1118. Hence, in use, when coupled to a workstring, the debris collection tool 1000 may be maintained in the inactive configuration while the workstring and other tools coupled to the workstring may be operated by fluid pressures that otherwise would transition the debris collection tool 1000 to the activated configuration. Thus, the debris collection may be selectively transitioned from the inactive configuration to the active configuration.
In order to transition the debris collection tool 1000 to the activated configuration, an activation pressure may be applied in the central longitudinal flowbore 1020 of the debris collection tool 1000. As described above, pressure applied in the central longitudinal flowbore 1020 of the debris collection tool 1000 may be communicated around the adaptor sleeve 1044 to the activation chamber 1088. The pressure in the activation chamber 1088 may be communicated to the bottom of the control piston 1120 of the controller 1106, resulting in the control piston 1120 experiencing an upwardly-directed force. This upwardly-directed force may be counteracted by the downward force produced by the biasing member 1122 and the pressure of the control fluid in the piston chamber 1118. In embodiments that include the fastener 1148, the upwardly-directed force on the control piston 1120 is also resisted by the fastener 1148. By increasing the pressure in the central longitudinal flowbore 1020 of the debris collection tool 1000, the pressure in the activation chamber 1088 increases. Thus the pressure on the bottom of the control piston 1120 of the controller 1106 increases, and the upwardly-directed force on the control piston 1120 increases accordingly. When the upwardly-directed force on the control piston 1120 exceeds the resistance provided by the downward force produced by the biasing member 1122 and the pressure of the control fluid in the piston chamber 1118 plus the force required to defeat the fastener 1148 (if present), such as a shear force, the control piston 1120 may begin to move upward.
When the control piston 1120 moves upward, control fluid in the piston chamber 1118 flows through the transfer bore 1132, through the check valve 1136, and into the lower portion of the upper chamber 1134. The balance piston 1142 may therefore move upward, and some of the fluid in the upper portion of the upper chamber 1134 may be vented to an exterior of the controller 1106 through the port 1144. Because the control piston 1120 moves upward, the piston sleeve 1124 and piston block 1146 also move upward. Additionally, the extension sleeve 1126 moves upward, as does the adaptor sleeve 1044 of the debris collection tool 1000 to which the extension sleeve 1126 is coupled. As described above, this results in the linkage 1046 moving upward, and thus the inner sleeve 1042 and inner magnet array 1048 of the debris collection tool 1000 also move upward. Hence, the debris collection tool 1000 transitions from the inactive configuration to the activated configuration.
Per the preceding description,
When the controller 1106 and debris collection tool 1000 are retrieved from a wellbore 1156, the debris collection tool 1000 may be transitioned back to the inactive configuration to allow for the accumulated debris to be released, and to allow for the debris collection tool 1000 to be run anew into the wellbore 1156. Furthermore, the controller 1106 may be reset.
As shown in
To reset the controller 1106 and transition the debris collection tool 1000 back to an inactive configuration, a flow path may be established for the control fluid to travel from the lower portion of the upper chamber 1134 to the piston chamber 1118, thereby releasing the control piston 1120 from the hydraulic lock. The establishment of the fluid flow path may be achieved by adjustment of the stop valve 1140 to open the flow path through the reset bore 1138. In some embodiments, the stop valve 1140 may be switched from a closed condition to an open condition. In some embodiments, the stop valve 1140 may be removed. In some embodiments, the stop valve 1140 may be partially removed, sufficiently to open the flow path through the reset bore 1138. Upon opening the flow path through the reset bore 1138, the biasing member 1122 may push the control piston 1120 downward, and control fluid may flow through the reset bore 1138 from the lower portion of the upper chamber 1134 into the piston chamber 1118. When the control piston 1120 has reached the end of its travel, the stop valve 1140 may be adjusted to close the flow path through the reset bore 1138.
Downward movement of the control piston 1120 results in downward movement of the piston block 1146. When the control piston 1120 has reached the end of its travel, a replacement fastener 1148 may be inserted into the piston block 1146. In some embodiments, the replacement fastener 1148 may be omitted. Downward movement of the control piston 1120 also results in downward movement of the extension sleeve 1126, and hence downward movement of the adaptor sleeve 1044 and the linkage 1046 of the debris collection tool 1000. Thus, the inner sleeve 1042 and inner magnet array 1048 of the debris collection tool 1000 also move downward. Hence, the debris collection tool 1000 transitions from the activated configuration to the inactive configuration. Debris accumulated around the debris collection tool 1000 may be cleared from the debris collection tool 1000, and the debris collection tool 1000 may then be run back into the wellbore 1156, if required.
Various embodiments have been described of a debris collection tool and other apparatus associated with a debris collection tool. In one embodiment, a debris collection tool may include a mandrel having a longitudinal flowbore therethrough and an inner sleeve disposed around the mandrel. A first array of magnets may be arranged on the inner sleeve. A second array of magnets may be disposed around the inner sleeve. The debris collection tool further may include an adaptor sleeve concentric with the mandrel and a linkage coupling the adaptor sleeve with the inner sleeve.
In another embodiment, a debris collection tool may include a mandrel having a longitudinal flowbore therethrough and an inner sleeve disposed around the mandrel. A first array of magnets may be arranged on the inner sleeve. The first array of magnets may include a plurality of inner magnets disposed around a circumference of the inner sleeve. The inner sleeve may have a longitudinal groove between two adjacent magnets of the first array of magnets. The debris collection tool further may include a second array of magnets disposed around the inner sleeve. The second array of magnets may include an annular arrangement of magnets between a pair of axially spaced end bands and may include a bridge between two circumferentially adjacent magnets. The bridge may be configured to project into the longitudinal groove. In some embodiments, the debris collection tool further may include an adaptor sleeve concentric with the mandrel and a linkage coupling the adaptor sleeve with the inner sleeve.
In another embodiment, a magnet assembly may include first and second annular end bands and may include an annular arrangement of magnets disposed between the first and second annular end bands. The first and second annular end bands may include substantially a non-magnetic material. The magnet assembly further may include a plurality of bridges. Each bridge may be disposed between the first and second annular end bands and between circumferentially adjacent magnets of the annular arrangement of magnets. The bridges may include substantially a magnetic material.
In another embodiment, a controller for a wellbore tool may include a first housing defining a first chamber, and a second housing coupled to the first housing and defining a second chamber. The controller further may include a valve block separating the first and second chambers. A piston may be axially movable within the first chamber. A sleeve may be coupled to the piston, and may extend from the first chamber into the second chamber through the valve block. A fastener may be coupled to sleeve and may be coupled to the second housing. The controller further may include a central longitudinal flowbore through the sleeve and the piston. A first bore through the valve block may fluidically couple an annulus between the sleeve and the first housing with the second chamber, and a check valve may be associated with the first bore. A second bore through the valve block may fluidically couple an annulus between the sleeve and the first housing with the second chamber, and a stop valve may be associated with the second bore.
While the foregoing is directed to embodiments of the present disclosure, other and further embodiments of the disclosure may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
This application is related to U.S. patent application Ser. No. 16/805,941, filed on Mar. 2, 2020, which is herein incorporated by reference in its entirety.