Certain downhole operations involve placement of elements in a downhole environment, where the element performs its function, and is then removed. For example, elements such as ball/ball seat assemblies and fracture (frac) plugs are downhole elements used to seal off lower zones in a borehole in order to carry out a hydraulic fracturing process (also referred to in the art as “fracking”) to break up different zones of reservoir rock. After the fracking operation, the ball/ball seat or plugs are then removed to allow fluid flow to or from the fractured rock.
Balls and/or ball seats, and frac plugs, can be formed of a corrodible material so that they need not be physically removed intact from the downhole environment. In this way, when the operation involving the ball/ball seat or frac plug is completed, the ball, ball seat, and/or frac plug is dissolved away. Otherwise, the downhole article may have to remain in the hole for a longer period than is necessary for the operation.
To facilitate removal, such elements can be formed of a material that reacts with the ambient downhole environment so that they need not be physically removed by, for example, a mechanical operation, but instead corrode or dissolve under downhole conditions. However, while corrosion rates of, for example, an alloy used to prepare such a corrodible article can be controlled by adjusting alloy composition, an alternative way of controlling the corrosion rate of a downhole article is desirable.
The above and other deficiencies of the prior art are overcome by, in an embodiment, a method of removing a downhole assembly includes contacting, in the presence of an electrolyte, a first article including a first material and acting as an anode, and a second article including a second material having a lower reactivity than the first material and acting as a cathode, the downhole assembly including the first article in electrical contact with the second article, wherein at least a portion of the first article is corroded in the electrolyte.
In another embodiment, a method of producing an electrical potential in a downhole assembly includes contacting, with an electrolyte, a first article, the first article including a first material and acting as an anode, and a second article, the second article including a second material having a lower reactivity than the material of the first article and acting as a cathode, with a conductive element to form a circuit.
In another embodiment, a downhole assembly includes a first article including a first material and acting as an anode, and a second article including a second material having a lower reactivity than the first material and acting as a cathode, the first and second articles being electrically connected by a conductive element to form a circuit, wherein in the presence of an electrolyte, the downhole assembly produces an electrical potential, and at least a portion of the first article is corroded.
Referring now to the drawings wherein like elements are numbered alike in the several Figures:
Disclosed herein is a method of controlling the corrosion of a downhole article. The downhole device includes an assembly of two subunits, a first subunit prepared from a first material, and a second subunit prepared from a second material, the first material having a higher galvanic activity (i.e., is more reactive) than the second material. The first and second materials can each be, for example, a different metal from the galvanic series. The first and second materials contact each other in the presence of an electrolyte, such as for example brine. The first subunit is, for example, a ball, made of a corrodible, high reactivity metal such as magnesium, which is anodic, and the second subunit is, for example, a ball seat made of a non-corrodible, relatively low reactivity metal (as compared to the high reactivity metal used to form the ball) such as nickel, iron, cobalt, etc, which is cathodic. Alternatively, in an embodiment, the first subunit is, for example, a ball seat, and the second, a ball. In an embodiment, by selecting the activities of the materials of the two subunits to have a greater or lesser difference in corrosion potentials, the high reactivity material corrodes at a faster or slower rate, respectively.
To initiate galvanic corrosion, electrical coupling of the anodic high reactivity metal and cathodic low reactivity metal is required, and an electrolyte is also present and is at once in contact with both the anode and cathode. In an embodiment, electrically coupling these subunits initiates galvanic corrosion. Where the higher reactivity component (e.g., the ball) is covered with a coating of an oxidation product of the high reactivity metal (such as Mg(OH)2 where the high reactivity metal is magnesium or an alloy thereof), a direct current electrical potential can be applied to (or generated by) the anodic and cathodic subunits via the electrical connection, to initiate the corrosion of the subunit made of high reactivity metal (e.g., the ball). The direct current source can be, for example, a battery placed downhole or at the surface, and electrically connected to the article.
Conversely, when these dissimilar metals are brought into electrical contact in the presence of an electrolyte, an electrochemical potential is generated between the anodic high reactivity metal subunit (i.e., the ball in the above example) and the cathodic low reactivity metal subunit (e.g., a ball seat). The greater the difference in corrosion potential between the dissimilar metals, the greater the electrical potential generated. In such an arrangement, the cathodic subunit is protected from corrosion by the anodic subunit, where the anodic subunit corrodes as a sacrificial anode. Corrosion of metal subunits in brines and other electrolytes can be reduced by coupling them to more active metals. For example, a steel article electrically coupled to a magnesium article in the presence of brine is less prone to corrosion than a steel article not in electrical contact with a magnesium article.
Electrically coupling the anodic ball and the cathodic ball seat with an electrolyte also produces an electrical potential useful to power a downhole device, such as, for example, a device for downhole signaling or sensing.
A method of removing a downhole assembly thus includes contacting, in the presence of an electrolyte, a first article comprising a first material and acting as an anode, and a second article comprising a second material having a lower reactivity than the material of the first article and acting as a cathode, the downhole assembly including the first article in electrical contact with the second article, wherein at least a portion of the first article is corroded in the electrolyte.
The first material includes any material suitable for use in a downhole environment, provided the first material is corrodible in the downhole environment relative to a second material having a different reactivity. In an embodiment, the first material comprises a magnesium alloy. Magnesium alloys include any such alloy which is corrodible in a corrosive environment including those typically encountered downhole, such as an aqueous environment which includes salt (i.e., brine), or an acidic or corrosive agent such as hydrogen sulfide, hydrochloric acid, or other such corrosive agents. Magnesium alloys suitable for use include alloys of magnesium with aluminum (Al), cadmium (Cd), calcium (Ca), cobalt (Co), copper (Cu), iron (Fe), manganese (Mn), nickel (Ni), silicon (Si), silver (Ag), strontium (Sr), thorium (Th), zinc (Zn), zirconium (Zr), or a combination comprising at least one of these elements. Particularly useful alloys include magnesium alloy particles including those prepared from magnesium alloyed with Ni, W, Co, Cu, Fe, or other metals. Alloying or trace elements can be included in varying amounts to adjust the corrosion rate of the magnesium. For example, four of these elements (cadmium, calcium, silver, and zinc) have to mild-to-moderate accelerating effects on corrosion rates, whereas four others (copper, cobalt, iron, and nickel) have a still greater accelerating effect on corrosion. Exemplary commercially available magnesium alloys which include different combinations of the above alloying elements to achieve different degrees of corrosion resistance include but are not limited to, for example, those alloyed with aluminum, strontium, and manganese such as AJ62, AJ50x, AJ51x, and AJ52x alloys, and those alloyed with aluminum, zinc, and manganese which include AZ91A-E alloys.
It will be appreciated that alloys having corrosion rates greater than those of the above exemplary alloys are contemplated as being useful herein. For example, nickel has been found to be useful in decreasing the corrosion resistance (i.e., increasing the corrosion rate) of magnesium alloys when included in amounts less than or equal to about 0.5 wt %, specifically less than or equal to about 0.4 wt %, and more specifically less than or equal to about 0.3 wt %, to provide a useful corrosion rate for the corrodible downhole article.
The above magnesium alloys are useful for forming the first article, and are formed into the desired shape and size by casting, forging and machining Alternatively, powders of magnesium or the magnesium alloy are useful for forming the first article. The magnesium alloy powder generally has a particle size of from about 50 to about 250 micrometers (μm), and more specifically about 60 to about 140 μm. The powder is further coated using a method such as chemical vapor deposition, anodization or the like, or admixed by physical method such as cryo-milling, ball milling, or the like, with a metal or metal oxide such as Al, Ni, W, Co, Cu, Fe, oxides of one of these metals, or the like. Such coated magnesium powders are referred to herein as controlled electrolytic materials (CEM). The CEM is then molded or compressed into the desired shape by, for example, cold compression using an isostatic press at about 40 to about 80 ksi (about 275 to about 550 MPa), followed by extrusion, forging, or sintering, or machining, to provide a core having the desired shape and dimensions.
It will be understood that the magnesium alloy or CEM, will thus have any corrosion rate necessary to achieve the desired performance of the article. In a specific embodiment, the magnesium alloy or CEM used to form the core has a corrosion rate of about 0.1 to about 150 mg/cm2/hour, specifically about 1 to about 15 mg/cm2/hour using aqueous 3 wt % KCl at 200° F. (93° C.).
The first article optionally has a non-metallic coating on a surface of the first article. The coating includes a soluble glass, a soluble polymer, or a metal oxide or hydroxide coating (including an anodized coating). In an embodiment, the non-metallic coating is an oxidation product of the metal of the first article, particularly where the first article comprises an active metal (relative to the second article). For example, where the first article comprises magnesium alloy, the non-metallic coating can be magnesium hydroxide formed by an anodic process. Alternatively, a hard metal oxide coating such as aluminum oxide can be applied to the surface of the first article by a deposition process.
The non-metallic coating is removed by ambient conditions downhole, or by application of an electric potential. For example, where the coating is a soluble material such as a soluble glass or polymer, the coating dissolves in the ambient downhole fluids, such as water, brine, distillates, or the like, to expose the underlying first material. Alternatively, where a metal oxide or hydroxide is used, an electrical contact can be established between the first and second articles, and an electrical potential applied to perform electrolysis on the coating and induce corrosion.
The second material is, in an embodiment, any metal having a lower reactivity than the first material, based on, for example, the saltwater galvanic series. The second material is also resistant to corrosion by a corrosive material. As used herein, “resistant” means the second material is not etched or corroded by any corrosive downhole conditions encountered (i.e., brine, hydrogen sulfide, etc., at pressures greater than atmospheric pressure, and at temperatures in excess of 50° C.).
By selecting the reactivity of the first and second materials to have a greater or lesser difference in their corrosion potentials, the high reactivity material (e.g., high reactivity metal) corrodes at a faster or slower rate, respectively. Generally, for metals in the galvanic series, the order of metals, from more noble (i.e., less active and more cathodic) to less noble (i.e., more active, and more anodic) includes for example steel, tungsten, chromium, nickel, cobalt, copper, iron, aluminum, zinc, and magnesium. The second material includes steel, tungsten, chromium, nickel, copper, iron, aluminum, zinc, alloys thereof, or a combination comprising at least one of the foregoing, where the first material is magnesium or an alloy thereof. In a specific embodiment, the first material is a magnesium alloy, and the second material is steel, nickel, cobalt, or copper.
In an embodiment, the second article is entirely fabricated of the second material, or the second article includes a layer of the second material. Here, a layer includes a single layer, or multiple layers of the same or different materials. Where layers are used, the underlying material is a metal, ceramic, or the like, and in an embodiment is, for example, fabricated from the first material such that it is separated from the first material of the first article by the layer(s) of second material.
The first article and second article are not limited to any particular shape or function. In an embodiment, the first and second articles are used together in a fitted assembly. For example, in one embodiment, the first article is CEM ball, and the second article is a ball seat. Alternatively, the first article is a CEM ball seat, and the second article is a ball. In another embodiment, the first article is a CEM fracture plug and the second is the housing for the fracture plug. In an embodiment, the first article is a CEM ball or frac plug, and the second article is the ball seat or housing (respectively), where this arrangement allows for greater adaptability of a system in which a variety of non-fixed articles (e.g., a ball) are all be used with one type of fixed article (such as a ball seat). Where desired, a portion of the fixed article (e.g., ball seat) is formed of a CEM coated with a more noble (second) metal such as zinc, aluminum, or nickel, so that the fixed article is removed by removing the second metal coating, and corroding the underlying CEM.
In an embodiment, the first article comprises a non-corrodible core comprising the second material and at least partially penetrating the first article, and a corrodible surrounding structure comprising the first material, wherein only the surrounding structure is corroded. The first article in this way is partially composed of the first material and second material. For example, the first article is a ball or elongated structure having one or more non-corrodible cores inserted part way into the article, or running axially or along a chord through the center of or off-center (respectively) of the ball or structure. Any dimension of the first article can be penetrated; in one embodiment, the longest dimension is traversed by the core. Thus, in an embodiment, the first article includes a low reactivity core (e.g., nickel) partially penetrating the first article, and a corrodible surrounding structure (e.g., a magnesium alloy or CEM).
In a non-limiting example, the first article is a corrodible ball formed of a magnesium alloy or CEM, having one or more nickel cores or screws inserted into it. This arrangement provides for close contact of the first and second materials, where the corrosion of the first article is accelerated by placing the article downhole and electrically connecting one or more of the nickel screws with the magnesium alloy ball. Conversely, the first article is a corrodible seat having one or more non-corrodible cores partially or fully penetrating (e.g., screwed) radially into the side. The presence of these cores provides additional contact between the first and second materials, and facilitates electrical contact with a second article (e.g., a ball where the first article is a seat, or vice versa).
In another embodiment, the first article comprises a corrodible core comprising the first material and at least partially penetrating the first article, and a non-corrodible surrounding structure comprising the second material, wherein only the core is corroded. The first article in this way includes a corrodible core penetrating through a long axis or diameter of the first article, and a non-corrodible surrounding structure. Application of a controlled corrosion to such first articles would then result in only the core being corroded, leaving a channel through the ball. In a non-limiting example, the first article is a non-corrodible ball made of a low reactivity material (e.g., of aluminum or nickel), with one or more high reactivity (e.g., magnesium alloy) cores penetrating (e.g., screwed into or formed) therethrough.
Conversely, the first article is the seat having a corrodible core penetrating (e.g., screwed) radially through the side, where the corrosion and removal of the corrodible core opens to the underlying sidewall and any features (e.g., channels, etc) beneath. In this way, the ball (or seat) is used to allow a partial flow. In further embodiments, the core comprises more than one metal in successive layers, each having a different reactivity. This arrangement can be used to selectively increase the flow, such as by forming the first article of concentric layers of increasingly noble metals (on the galvanic scale, such as layers of different magnesium alloys, which are corrodible relative to the surrounding structure), which would allow a gradual increase in the size of the channel as additional layers are corroded.
The electrolyte includes an aqueous or non-aqueous electrolyte, depending on the application and controllability of ambient conditions. A non-aqueous electrolyte includes an ionic liquid, a molten salt, an ionic liquid dissolved in an oil, or a salt dissolved in a polar aprotic solvent such as ethylene carbonate, propylene carbonate, dimethylformamide, dimethylacetamide, gamma-butyrolactone, or other such solvents. However, where the article is a downhole element, controlling the ambient conditions to exclude moisture is not practical, and hence, under such conditions, the electrolyte is an aqueous electrolyte. Aqueous electrolytes include water or a salt dissolved in water, such as brine, an acid, or a combination comprising at least one of the foregoing.
In a method of controlling corrosion in a downhole environment, corroding the first article by the electrolyte is accomplished by electrically contacting the first and second articles in the presence of the electrolyte, optionally by inducing the corrosion by applying a potential to the first and second articles in the presence of the electrolyte. A direct current electrical potential can thus be applied to the anode and cathode (second and first articles, respectively, where the first and second articles are electrically insulated from one another and the cell is being run in reverse) via the electrical connection, to initiate the corrosion in the first article. The source of the direct current for this process can be, for example, a moving sleeve within the article, in which the sleeve is mechanically coupled to a power source (a battery, magneto, or a small generator which generates a current by induction).
In another embodiment, the downhole assembly, when electrically connected to provide a complete electrical circuit, produces electrical current by forming a galvanic cell in which the first and second articles (i.e., anode and cathode, comprising the first and second metals, respectively, where the cell is being run forward) are electrically connected by a bridging circuit in the presence of the electrolyte. The first and second articles are not in direct electrical contact with each other but are in electrical contact through (i.e., in common electrical contact with) an electrolyte, or where in physical contact are separated by, for example an insulating material such as a coating of Mg(OH)2 or a non-conductive O-ring to prevent a short circuit of the cell. Such an arrangement is sufficient to provide power to run a device such as for example, a transmitter or sensor, or other such device. Thus, a method of producing an electrical potential in a downhole assembly includes contacting, with an electrolyte, a first article, the first article comprising a first metal and acting as an anode; and a second article, the second article comprising a second metal having a lower reactivity than the metal of the first article and acting as a cathode. The anode and cathode are in common electrical contact with each other via a conductive element (e.g., an electric load, such as a sensor or heater) to form a circuit.
A downhole assembly includes a first article comprising a first material, and a second article comprising a second material having a lower reactivity than the material of the first article and acting as a cathode, the first and second articles being electrically connected by a conductive element (e.g., electric load) to form a circuit, wherein in the presence of an electrolyte, the downhole assembly produces an electrical potential, and at least a portion of the first article is corroded.
Different exemplary embodiments of the downhole assembly are further described in the Figures.
In another embodiment, shown in
In another embodiment,
In another example,
In another embodiment, the axial core 321 can be made of the first metal, while the outer core 322 can be made of the second metal, where the axial core 321 corrodes leaving the outer core 322. Similarly, in another embodiment, the axial core 321 can be made of the second metal, while the outer core 322 can be made of the first metal, where the outer core 322 corrodes leaving the axial core 321. In these embodiments, axial core 321 and outer core 322 remain in constant electrical contact. Because any Mg(OH)2 coating on the first metal is incomplete, electrolyte contacts both the axial and outer cores 321 and 322, respectively. In the embodiment, the part of the article made of the more reactive first metal will corrode faster, and the material of the seating portion 311 therefore does not govern the galvanic interaction.
It is noted that axial core 321 and outer core 322 remain in constant electrical contact. Because any Mg(OH)2 coating on the first metal is incomplete, electrolyte contacts both the axial core 321 and the outer core 322. In this embodiment, the part of the article (e.g., the ball) made of the more active first metal will corrode faster, and the material of the seating portion 311 therefore does not affect the corrosion of the axial or outer cores 321 or 322.
In another embodiment, a frack plug of the first metal and having a ball or check valve of the first metal has a cap of an additional active material, such as a reactive magnesium alloy powder that is more reactive than the first metal, placed on top of the plug. In this way, the corrosion of the additional active material by contact with the less reactive frack plug/ball/check valve allows access to the ball or check valve.
While one or more embodiments have been shown and described, modifications and substitutions may be made thereto without departing from the spirit and scope of the invention. Accordingly, it is to be understood that the present invention has been described by way of illustrations and not limitation.
All ranges disclosed herein are inclusive of the endpoints, and the endpoints are independently combinable with each other. The suffix “(s)” as used herein is intended to include both the singular and the plural of the term that it modifies, thereby including at least one of that term (e.g., the colorant(s) includes at least one colorants). “Optional” or “optionally” means that the subsequently described event or circumstance can or cannot occur, and that the description includes instances where the event occurs and instances where it does not. As used herein, “combination” is inclusive of blends, mixtures, alloys, reaction products, and the like. All references are incorporated herein by reference.
The use of the terms “a” and “an” and “the” and similar referents in the context of describing the invention (especially in the context of the following claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. Further, it should further be noted that the terms “first,” “second,” and the like herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The modifier “about” used in connection with a quantity is inclusive of the stated value and has the meaning dictated by the context (e.g., it includes the degree of error associated with measurement of the particular quantity).
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