Non-contact intelligent oil pipe joint tool

Abstract

A non-contact intelligent oil pipe joint tool belongs to the technical field of non-contact oil pipe joint tools and comprises a double-male-head standard oil pipe, an upper joint, a lower joint and a hollow steel pipe, the hollow steel pipe is arranged in the double-male-head standard oil pipe, and the upper end of the double-male-head standard oil pipe is in threaded connection with the upper joint. The lower end of the double-male-head standard oil pipe is in threaded connection with a lower connector, and the upper portion and the lower portion of a hollow steel pipe penetrate into an upper connector and the lower connector respectively and are sealed at penetrating points. A single-core cable is arranged in a hollow steel pipe, the two ends of the cable form non-contact coupling structures in an upper connector and a lower connector respectively and are sealed, a non-contact intelligent oil pipe is obtained, the upper connector of one oil pipe and the lower connector of the other oil pipe are mechanically connected and sealed, and the oil pipes are connected to form a pipeline. And meanwhile, the upper joint and the lower joint complete electrical non-contact coupling, so that the single-core cable arranged in the hollow steel pipe is electrically connected. The invention effectively solves the problem that the conventional cable-controlled layered water injection technology is difficult to implement under-pressure operation.

Description

Technical Field

[0001] The invention belongs to the technical field of non-contact intelligent oil pipe joint tools for oil field stratified water injection, and in particular relates to a non-contact intelligent oil pipe joint tool. Background Art

[0002] Water injection is the most economical and effective way to maintain formation energy and improve oil field recovery in water-driven oilfield development. In the process of water injection development, stratified water injection technology plays an important role in balancing the use of various oil layers and improving the use of poor oil layers, realizing stratified exploitation of multi-layer oil reservoirs, and providing technical support to ensure that the domestic water-driven development crude oil production remains above 80% of the total production. The continuous development of new water injection technology has made domestic stratified water injection technology always in the world's leading position.

[0003] Domestic oil fields began to carry out research on stratified water injection technology in the 1960s. Oilfield water injection has gradually developed from the early general water injection to stratified water injection and subdivided layer system water injection. The stratified injection process has gone through the hollow stratified injection process, eccentric stratified injection process, bridge eccentric stratified injection process, and concentric integrated stratified injection process. The technical problems that appeared in different water injection development stages have been effectively solved. However, as the development of oil fields has entered the stage of fine water injection, new problems have emerged: due to the constraints of testing equipment and testing forces, the field testing efficiency of the downhole casting and fishing testing process supporting conventional downhole stratified water injection technology is difficult to significantly improve. In order to effectively solve the problem of low downhole testing efficiency, the bridge-type eccentric measurement and adjustment linkage stratified water injection process technology and the bridge-type concentric stratified water injection process technology without casting and fishing have been developed successively, thus realizing the efficient water injection development of oil fields.

[0004] Since some water injection wells in oil fields are affected by factors such as well depth, borehole trajectory, corrosion and scaling, and water injection sensitivity, many technical problems such as short sealing validity period of downhole packers, low success rate and efficiency of testing and debugging, short validity period of data, and low success rate of well repair operations have emerged. Therefore, the fourth-generation intelligent stratified water injection technology (including ground intelligent control multi-tube injection technology and cable-controlled stratified water injection technology) has been developed, which has five technical advantages: ① Oilfield water well testing, sealing verification, and deployment operations do not require the use of test vehicles and pump tankers; ② It can obtain "interference-free" data downhole in real time and for a long time; ③ Through the unified time calibration on the ground, strictly realize the synchronous measurement and adjustment of multi-layer sections; ④ The power consumption and capacity of the motor drive are not limited, and the problems such as plugging can be continuously deployed and effectively handled; ⑤ It can realize wireless remote monitoring and control, and timely and efficiently implement the reservoir water injection plan. The field application is basically stable, and the real-time monitoring and remote control of water injection parameters are realized, which effectively solves the above technical problems.

[0005] Before the application of this innovative achievement, the cable-controlled stratified water injection technology, because its communication cable is placed outside the oil pipe, is clamped on the oil pipe with a cable clip and lowered into the well along with the water injection string. Based on this, when the string is lowered during the on-site construction of the water well in the high-pressure block, the wellhead cannot be completely sealed, and it is difficult to achieve water well pressure operation. Because the water injection development oil field is long-term water injection to maintain the formation energy in order to maintain the high and stable production of the oil well, most water well construction operations must be carried out under pressure. For the water injection wells in the high-pressure block, it is necessary to stop the injection and release the pressure before the conventional well repair operation, and the pressure relief cycle is long, ranging from two to three months to half a year. It not only releases the formation energy, but also increases the water treatment volume, and seriously affects the production of the oil wells in the block. The built-in cable-controlled stratified water injection technology can effectively solve the above problems and achieve water well pressure operation. The non-contact intelligent oil pipe joint tool is a key technology in the built-in cable-controlled stratified water injection technology. Summary of the invention

[0006] In order to solve the above-mentioned problems, the present invention proposes: a non-contact intelligent oil pipe joint tool, including a double male standard oil pipe, an upper joint, a lower joint and a hollow steel pipe, the double male standard oil pipe has a hollow steel pipe built in, which is attached to one side of the inner wall of the oil pipe, the upper end of a double male standard oil pipe is threadedly connected to the upper joint, the lower end of the double male standard oil pipe is threadedly connected to the lower joint, the hollow steel pipe is respectively inserted into the upper joint and the lower joint from top to bottom, and is sealed at the insertion point; a single-core cable is built in the hollow steel pipe, and the two ends of the cable form a non-contact coupling structure in the upper joint and the lower joint respectively and are sealed to obtain a non-contact intelligent oil pipe, the two non-contact intelligent oil pipes are butt-jointed, the upper joint of one oil pipe and the lower joint of the other oil pipe are mechanically connected and sealed, so that the oil pipes are connected to form a pipeline, and at the same time, the upper joint and the lower joint complete electrical non-contact coupling, so that the single-core cable built in the hollow steel pipe completes electrical connection.

[0007] Furthermore, the upper joint includes an upper joint shell, a first non-contact coupling component, a first spring component and an upper joint base. The upper joint base is connected and sealed with a double male standard oil pipe buckle. The upper joint shell is connected to the upper joint base through threads and sealed through an O-ring. The hollow steel pipe is inserted from the right side of the upper joint base and is welded and sealed in the left end face welding groove; one end of the first spring component cooperates with the stop of the upper joint base and is fastened by radial screws, and the other end of the first spring component cooperates with the stop of the first non-contact coupling component and is fastened by radial screws; the single-core cable inside the hollow steel pipe extends out of the steel pipe, passes through the first spring component, enters the first non-contact coupling component and is sealed.

[0008] Furthermore, the lower joint includes a lower joint base, a second spring assembly, a second non-contact coupling assembly, a lower joint center tube and a straightening protection sleeve. The lower joint base is connected and sealed with a double male standard oil pipe buckle. The lower joint center tube is connected to the lower joint base through threads and sealed through an O-ring. The hollow steel pipe is inserted from the left side of the lower joint base and is welded and sealed in the right end face welding groove. One end of the second spring assembly and the straightening protection sleeve cooperate with the stop of the lower joint base and are fastened by radial screws. The other end of the second spring assembly cooperates with the stop of the second non-contact coupling assembly and is fastened by radial screws. After the single-core cable inside the hollow steel pipe extends out of the steel pipe, it passes through the second spring assembly, enters the second non-contact coupling assembly and is sealed.

[0009] Further, the upper joint of one oil pipe and the lower joint of another oil pipe are mechanically connected and sealed, and the upper joint shell and the lower joint base are connected by radial pins and sealed by O-rings.

[0010] Furthermore, the center tube of the lower joint is matched with the axial hole of the upper joint base body of the third oil pipe and is sealed by an O-ring.

[0011] Further, the first non-contact coupling component and the second non-contact coupling component are non-contact coupling components with the same structure.

[0012] Furthermore, the non-contact coupling component includes an iron core protection shell, an iron core, a sealing ring and a pressing plate. The iron core protection shell cooperates with the iron core shaft hole, and the fitting gap is sealed by an O-ring; the iron core cooperates with the sealing ring shaft hole, and the fitting gap is sealed by an O-ring; a coupling coil is embedded in the internal cavity of the iron core, and the two ends of the coil are respectively passed through two holes on the left end face of the iron core protection shell, one wire end is welded and sealed to the iron core protection shell body, and the other wire end is covered with a rubber sleeve and passed through the sealing hole, and is sealed by the rubber sleeve on the end face of the pressing plate. The non-contact coupling component realizes end face compression contact through spring force.

[0013] Furthermore, the first spring assembly and the second spring assembly are spring assemblies with the same structure.

[0014] Furthermore, the spring assembly includes a spring connecting ring and a spring, and the spring connecting ring and the spring are welded to form a mechanical connection interface between the spring assembly and other components.

[0015] The beneficial effects of the present invention are as follows: the patent of the present invention is mainly used for the built-in cable-controlled stratified water injection technology in water-driven oil fields. The key technology of the present invention is the non-contact intelligent oil pipe joint tool, which can effectively solve the problem that conventional cable-controlled stratified water injection technology is difficult to implement pressurized operation. Pressurized operation has the advantages of protecting formation energy, reducing water treatment volume, stabilizing oil well production, and maximizing comprehensive benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the single oil pipe transformation structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the butt connection of two oil pipes according to the present invention;

[0018] Figure 3 This is a structural diagram of the intelligent oil pipe upper joint of the present invention;

[0019] Figure 4 This is a structural diagram of the intelligent oil pipe lower joint of the present invention;

[0020] Figure 5 It is a structural diagram of the non-contact coupling component of the present invention;

[0021] Figure 6 This is a structural diagram of the spring assembly of the present invention.

[0022] Wherein, the accompanying drawings are marked as follows:

[0023] 1. Double male standard oil pipe, 2. Upper joint, 3. Lower joint, 4. Hollow steel pipe, 21. Upper joint shell, 22. First non-contact coupling component, 23. Spring assembly, 24. Upper joint base, 31. Lower joint base, 32. Spring assembly, 33. Second non-contact coupling component, 34. Lower joint center tube, 35. Righting protection sleeve, 221. Core protection shell, 222. Core, 223. Sealing ring, 224. Pressing piece, 231. Spring connecting ring, 232. Spring. DETAILED DESCRIPTION

[0024] In order to make the technical means and objectives of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments. A non-contact intelligent oil pipe joint tool, such as Figure 1-Figure 6 As shown, it includes: a double male standard oil pipe 1, an upper joint 2, a lower joint 3, a hollow steel pipe 4, an upper joint shell 21, a first non-contact coupling component 22, a first spring component 23, an upper joint base 24, a lower joint base 31, a second spring component 32, a second non-contact coupling component 33, a lower joint center tube 34, a straightening protection sleeve 35, an iron core protection shell 221, an iron core 222, a sealing ring 223, a pressing piece 224, a spring connecting ring 231, and a spring 232.

[0025] The design concept of the non-contact intelligent oil pipe joint is as follows: a double-male standard oil pipe 1 is modified, a hollow steel pipe 4 is built inside the oil pipe, attached to one side of the inner wall of the oil pipe and straightened; the upper end of the standard oil pipe 1 is threadedly connected to the upper joint 2, and the lower end is threadedly connected to the lower joint 3; the hollow steel pipe 4 is inserted into the upper joint 2 and the lower joint 3 from top to bottom, and sealed at the insertion point; a single-core cable is built inside the hollow steel pipe 4, and the two ends of the cable form a non-contact coupling structure inside the upper joint 2 and the lower joint 3 respectively and are sealed, thereby completing the modification of the non-contact intelligent oil pipe (see Figure 1 ).

[0026] When two non-contact intelligent oil pipes are connected, the upper joint 2 of the lower oil pipe and the lower joint 3 of the upper oil pipe can be mechanically connected and sealed, so that the oil pipes are connected to form a pipeline; at the same time, the upper joint 2 and the lower joint 3 complete the electrical non-contact coupling, so that the single-core cable built into the hollow steel pipe 4 completes the electrical connection (see Figure 2 ).

[0027] The connection relationship of each component in the intelligent oil pipe upper joint structure is as follows: the upper joint base 24 is connected and sealed with the male oil pipe buckle of the standard oil pipe 1; the upper joint shell 21 is connected with the upper joint base 24 through threads and sealed by an O-ring; the hollow steel pipe 4 is inserted from the right side of the upper joint base 24, and is welded and connected in the left end face welding groove and sealed; one end of the first spring component 23 is matched with the stopper of the upper joint base 24 and fastened by radial screws, and the other end is matched with the stopper of the first non-contact coupling component 22 and fastened by radial screws; the single-core cable inside the hollow steel pipe 4 extends out of the steel pipe, passes through the first spring component 23, enters the first non-contact coupling component 22 and is sealed (see Figure 3 ).

[0028] The connection relationship of each component in the intelligent oil pipe lower joint structure is as follows: the lower joint base 31 is connected to the male oil pipe buckle of the standard oil pipe 1 and sealed; the lower joint center pipe 34 is connected to the lower joint base 31 through threads and sealed through an O-ring; the hollow steel pipe 4 is inserted from the left side of the lower joint base 31, and is welded and connected in the welding groove on the right end face and sealed; one end of the second spring component 32 and the straightening protection sleeve 35 are matched with the stopper of the lower joint base 31 and fastened by radial screws, and the other end of the second spring component 32 is matched with the stopper of the second non-contact coupling component 33 and fastened by radial screws; the single-core cable inside the hollow steel pipe 4 extends out of the steel pipe, passes through the inside of the second spring component 32, enters the inside of the second non-contact coupling component 33 and is sealed (see Figure 4 ).

[0029] Figure 3 , Figure 4 The non-contact components 22, 33 in the embodiment can be used interchangeably, and the first spring components 23, 32 can be used interchangeably.

[0030] The connection relationship between the non-contact intelligent oil pipe upper joint 2 and the lower joint when they are connected is: the upper joint shell 21 and the lower joint base 31 are connected by radial pins, which can transmit force and torque, and are sealed by O-rings; the lower joint center tube 34 cooperates with the axial hole of the upper joint base 24 and is sealed by O-rings; the non-contact component 22 and the non-contact component 33 achieve end face compression contact through spring force.

[0031] The connection relationship of each component in the structure of the contactless coupling component is: the core protection shell 221 is matched with the axial hole of the core 222, and the matching gap is sealed by an O-ring; the core 222 is matched with the axial hole of the sealing ring 223, and the matching gap is sealed by an O-ring; the coupling coil is embedded in the internal cavity of the core 222, and the two ends of the coil are respectively passed through the two holes on the left end face of the core protection shell 221, one wire end is welded and sealed with the body of the core protection shell 221, and the other wire end is covered with a rubber sleeve and passed through the sealing hole, and is sealed by the rubber sleeve on the end face of the pressing piece 224 (see Figure 5 ).

[0032] In the spring assembly structure, the spring connecting ring 231 and the spring 232 are welded to form a mechanical connection interface between the spring 232 and other components (see Figure 6 ).

[0033] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A non-contact intelligent oil pipe joint tool, It is characterized in that The invention comprises a double male standard oil pipe (1), an upper joint (2), a lower joint (3) and a hollow steel pipe (4). The double male standard oil pipe (1) has a hollow steel pipe (4) built inside and attached to one side of the inner wall of the oil pipe. The upper end of the double male standard oil pipe (1) is threadedly connected to the upper joint (2), and the lower end of the double male standard oil pipe (1) is threadedly connected to the lower joint (3). The hollow steel pipe (4) is respectively inserted into the upper joint (2) and the lower joint (3) from top to bottom and sealed at the insertion point. ) has a single-core cable built inside, and both ends of the cable form a non-contact coupling structure inside the upper joint (2) and the lower joint (3) and are sealed, respectively, to obtain a non-contact intelligent oil pipe. The two non-contact intelligent oil pipes are butt-jointed, and the upper joint (2) of one oil pipe and the lower joint (3) of the other oil pipe are mechanically connected and sealed, so that the oil pipes are connected to form a pipeline. At the same time, the upper joint (2) and the lower joint (3) complete electrical non-contact coupling, so that the single-core cable built inside the hollow steel pipe (4) completes electrical connection.

2. The non-contact intelligent oil pipe joint tool according to claim 1, It is characterized in that The upper joint (2) comprises an upper joint shell (21), a first non-contact coupling component (22), a first spring component (23) and an upper joint base (24); the upper joint base (24) is connected and sealed with a pipe buckle of a double male standard oil pipe (1); the upper joint shell (21) is connected to the upper joint base (24) by threads and sealed by an O-ring; the hollow steel pipe (4) is inserted from the right side of the upper joint base (24) and welded and sealed in the left end face welding groove; one end of the first spring component (23) is matched with the stopper of the upper joint base (24) and is fastened by radial screws; the other end of the first spring component (23) is matched with the stopper of the first non-contact coupling component (22) and is fastened by radial screws; the single-core cable inside the hollow steel pipe (4) extends out of the steel pipe, passes through the first spring component (23), enters the first non-contact coupling component (22) and is sealed.

3. The non-contact intelligent oil pipe joint tool as claimed in claim 2, It is characterized in that The lower joint (3) comprises a lower joint base (31), a second spring assembly (32), a second non-contact coupling assembly (33), a lower joint center tube (34) and a straightening protection sleeve (35); the lower joint base (31) is connected and sealed with a pipe buckle of a double male standard oil pipe (1); the lower joint center tube (34) is connected to the lower joint base (31) through threads and sealed through an O-ring; the hollow steel pipe (4) is inserted from the left side of the lower joint base (31) and welded and sealed in the right end face welding groove; one end of the second spring assembly (32) and the straightening protection sleeve (35) are matched with the stopper of the lower joint base (31) and are fastened by radial screws; the other end of the second spring assembly (32) is matched with the stopper of the second non-contact coupling assembly (33) and is fastened by radial screws; after the single-core cable inside the hollow steel pipe (4) extends out of the steel pipe, it passes through the inside of the second spring assembly (32), enters the inside of the second non-contact coupling assembly (33) and is sealed.

4. The non-contact intelligent oil pipe joint tool as claimed in claim 3, It is characterized in that An upper joint (2) of one oil pipe and a lower joint (3) of another oil pipe are mechanically connected and sealed, and an upper joint housing (21) and a lower joint base (31) are connected via radial pins and sealed via an O-ring.

5. The non-contact intelligent oil pipe joint tool as claimed in claim 4, It is characterized in that The central tube (34) of the lower joint (3) matches the axial hole of the upper joint base (24) of the third oil pipe and is sealed by an O-ring.

6. The non-contact intelligent oil pipe joint tool as claimed in claim 5, It is characterized in that The first non-contact coupling component (22) and the second non-contact coupling component (33) are non-contact coupling components with the same structure.

7. The non-contact intelligent oil pipe joint tool according to claim 6, It is characterized in that The non-contact coupling component comprises an iron core protection shell (221), an iron core (222), a sealing ring (223) and a pressing plate (224); the iron core protection shell (221) is matched with the axial hole of the iron core (222), and the matching gap is sealed by an O-ring; the iron core (222) is matched with the axial hole of the sealing ring (223), and the matching gap is sealed by an O-ring; a coupling coil is embedded in the inner cavity of the iron core (222), and the two ends of the coil are respectively passed through two holes on the left end face of the iron core protection shell (221); one wire end is welded and sealed to the body of the iron core protection shell (221); the other wire end is covered with a rubber sleeve and passed through the sealing hole, and is sealed by the rubber sleeve on the end face of the pressing plate (224); the non-contact coupling component realizes end face pressing contact by spring force.

8. The non-contact intelligent oil pipe joint tool as claimed in claim 7, It is characterized in that The first spring assembly (23) and the second spring assembly (32) are spring assemblies with the same structure.

9. The non-contact intelligent oil pipe joint tool as claimed in claim 8, It is characterized in that The spring assembly comprises a spring connecting ring (231) and a spring (232); the spring connecting ring (231) and the spring (232) are connected by welding to form a mechanical connection interface between the spring assembly and other components.

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