The present disclosure relates to, but is not limited to, the technical field of electrical connection of logging while drilling instruments, in particular to a connecting structure for drill collars of logging while drilling instruments and drill collar sub male and female joints.
In the research and development of the logging while drilling instruments (for formation pressure measurement and sampling while drilling), a drill collar connector is required to establish electrical connection and liquid connection between two drill collar subs. There are generally two ways to realize the electrical connection. One way is to install plug and socket respectively in the centers of the connecting parts of the two instruments. The other way is to install a conductive ring on the stepped surface of the drill collar at which the male and female joints are butted. As for the above two types of connection, the conductive slip ring is directly installed on and integrated with the drill collar connector, thereby the volume of the drill collar connector is relatively large, and it is difficult to replace the conductive slip ring.
The following is an overview of the subject matters described in detail in this disclosure. This summary is not intended to limit the scope of protection of the claims.
The present disclosure provides a connecting structure for a drill collar of a logging while drilling instrument, which includes a male connecting joint and a female connecting joint matched with each other. The male connecting joint and the female connecting joint are rotatable relative to each other. Electrical passages are respectively arranged in the male connecting joint and the female connecting joint. One of the male connecting joint and the female connecting joint is provided with a multi-core coaxial electrical male connector connected with the electrical passage, and the other is correspondingly provided with a multi-core coaxial electrical female connector connected with the electrical passage. The male connecting joint is coaxially nested in the female connecting joint. The multi-core coaxial electrical male connector is inserted into and fitted to the multi-core coaxial electrical female connector.
The present disclosure further provides a drill collar sub male joint, which includes a male joint body provided with an electrical passage therein. An opened groove is arranged at the front end of the male joint body, and a male connecting joint is arranged in the opened groove. A multi-core coaxial electrical female connector connected with the electrical passage is arranged in the male connecting joint.
The present disclosure further provides a drill collar sub female joint, which includes a female joint body provided with an electrical passage therein. An opened groove is arranged at the front end of the female joint body, and a female connecting joint is arranged in the opened groove. A multi-core coaxial electrical male connector connected with the electrical passage is arranged in the female connecting joint.
Other features and advantages of the present disclosure will be set forth in the following description, and partly become apparent from the description, or be understood by implementing the present disclosure. The purposes and other advantages of the present disclosure can be achieved and obtained by means of the structures specifically indicated in the description, claims and drawings.
The drawings, provided for further understanding of the technical schemes of the present disclosure and constituting a part of the description, are used for explaining the technical schemes of the present disclosure in combination with the embodiments, and do not limit the technical schemes of the present disclosure.
In order to make the objects, technical schemes and advantages of the present disclosure clearer, the embodiments will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other arbitrarily if there is no conflict.
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In some embodiments, a multi-core coaxial electrical male connector 5 may be provided in the male connecting joint 1, and a multi-core coaxial electrical female connector 4 may be correspondingly provided in the female connecting joint 2.
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In this disclosure, by mating the multi-core coaxial electrical male connector 5 and the multi-core coaxial electrical female connector 4, the electrical connection of the drill collar of the logging while drilling instrument is realized. The conductive slip rings are arranged in the multi-core coaxial electrical male connector 5 and the multi-core coaxial electrical female connector 4, thus the volume and weight of the male connecting joint 1 and the female connecting joint 2 are reduced, and the assembly is easy to carry out with no need for identifying the position by rotation. Additionally, in the present disclosure, by replacing the multi-core coaxial electrical male connector 5 and the multi-core coaxial electrical female connector 4, the number of conductive slip rings can be modified so as to increase or decrease the number of cores for electrical connection. Besides, the multi-core coaxial electrical male connector 5 and the multi-core coaxial electrical female connector 4 can be replaced separately, thereby reducing the maintenance cost.
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In an embodiment, the male connector 101 is inserted into the opened groove of the female connector 201 to coaxially nest the male connecting joint 1 with the female connecting joint 2.
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In an embodiment, the male connecting joint 1 and the female connecting joint 2 are respectively provided at their outer sides with grooves for the passage of mud, ensuring that the mud passes through the drill collar sub male and female joints smoothly.
Optionally, a plurality of first conductive slip rings are provided at an outer wall of the multi-core coaxial electrical male connector at intervals, and a plurality of second conductive slip rings are correspondingly provided at an inner wall of the multi-core coaxial electrical female connector, and the multi-core coaxial electrical male connector is inserted into and fitted to the multi-core coaxial electrical female connector so as to electrically connect the first conductive slip rings with the second conductive slip rings.
Optionally, electrical connection pipes connected with the electrical passages are respectively provided at the rear ends of the male connecting joint and the female connecting joint, and a sub male connector or sub female connector is provided at the rear end of the electrical connection pipe.
Optionally, a sealing ring is provided at the outer wall of the electrical connection pipe.
Optionally, grooves are respectively provided at the outer sides of the male connecting joint and the female connecting joint for the passage of mud.
Optionally, liquid passages are respectively arranged in the male connecting joint and the female connecting joint, a first annular connecting groove communicated with the liquid passage being provided in the outer wall of the male connecting joint, a second annular groove communicated with the liquid passage being provided in the inner wall of the female connecting joint, the male connecting joint is coaxially nested in the female connecting joint, so that the first annular connecting groove is connected with the second annular connecting groove.
Optionally, liquid connection pipes communicated with the liquid passages are respectively provided at the rear ends of the male connecting joint and the female connecting joint.
Optionally, a sealing surface protection sleeve is sleeved on the outer side of the front end of the male connecting joint.
Optionally, the female connecting joint is provided with a female connector and the male connecting joint is provided with a male connector, the multi-core coaxial electrical male connector being installed in an opened groove at the front end of the female connector, the multi-core coaxial electrical female connector being installed in an opened groove at the front end of the male connector, the male connector being inserted into the opened groove of the female connector to realize coaxial nesting of the male connecting joint and the female connecting joint.
Optionally, a mounting sleeve is arranged in the female connecting joint, and the multi-core coaxial electrical male connector is inserted into the mounting sleeve.
Optionally, a buffer spring is arranged between the female connector and the multi-core coaxial electrical male connector.
In the present disclosure, by matching the multi-core coaxial electrical male connector with the multi-core coaxial electrical female connector, the electrical connection of the drill collar of the logging while drilling instrument is achieved. Furthermore, the multi-core coaxial electrical male connector and the multi-core coaxial electrical female connector can rotate relative to each other without affecting the electrical connection.
In the present disclosure, by arranging the conductive slip rings on the multi-core coaxial electrical male connector and the multi-core coaxial electrical female connector, the volume and weight of the male connecting joint and the female connecting joint are reduced. Also, the assembly is facilitated and there is no need to identify the position by rotation.
In the present disclosure, by replacing the multi-core coaxial electrical male connector and the multi-core coaxial electrical female connector, the number of conductive slip rings can be changed and the number of electrically connected cores can be increased or decreased. Besides, the multi-core coaxial electrical male connector and the multi-core coaxial electrical female connector can be separately replaced, thereby reducing the maintenance cost.
In the present disclosure, by connecting the first annular connecting groove and the second annular connecting groove, the communication between the liquid passages is realized, so that the male connecting joint and the female connecting joint can rotate relative to each other without affecting the liquid communication.
While the embodiments of the present disclosure are described above, the above embodiments are merely described for ease of understanding the present disclosure, and are not intended to limit the present disclosure. Any modifications and variations can be made, in the forms and details, to the embodiments by a person skilled in the art to which the present disclosure pertains without departing from the spirit and scope of the present disclosure. The patent protection scope of the present disclosure shall be defined by the appended claims.
Number | Date | Country | Kind |
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201910122743.9 | Feb 2019 | CN | national |
The present application is a U.S. National Phase Entry of International PCT Application No. PCT/CN2019/080953 having an international filing date of Apr. 2, 2019, which claims priority to Chinese patent application No. 201910122743.9 filed to the CNIPA on Feb. 19, 2019. The present application claims priority and the benefit of the above-identified applications and the above-identified applications are incorporated by reference herein in their entirety.
Filing Document | Filing Date | Country | Kind |
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PCT/CN2019/080953 | 4/2/2019 | WO | 00 |