Downhole wet connector tooling device and oiling method

Abstract

The present application relates to a kind of downhole wet joint tooling device and oil injection method, downhole wet joint tooling device includes wet joint female head and tooling assembly, wet joint female head includes shell, outer capsule and inner capsule, outer capsule is fixed in shell, and the internal space of outer capsule is divided into independent outer oil cavity, inner oil cavity and outer capsule oil cavity, inner capsule is fixed in the outer capsule oil cavity, and inner capsule is communicated with inner oil cavity, outer capsule oil cavity and outer oil cavity are communicated, tooling assembly includes the oil injection tooling with pin and oil supplement tooling.Oil injection method includes the mode that wet joint female head is first injected under vacuum, then inner capsule is supplemented with oil using oil supplement tooling in conventional environment.The present application realizes internal and external pressure balance by the deformation of inner capsule, avoids the problem that joint is easily broken to cause jet or overflow when wet joint female head is docked due to sharp change of pressure.

Description

Technical Field

[0001] This invention relates to the field of downhole joint technology, specifically to a downhole wet joint tooling device and oil injection method. Background Technology

[0002] With the continuous development of oil and gas exploration and development technologies, downhole wet joint tools have made great strides. The pressure-balanced capsule structure is now commonly used to meet the docking needs of wet joints downhole.

[0003] The existing female wet connector uses a pressure-balanced capsule structure, which increases the oil storage space and allows for sufficient internal pressure compensation. This effectively prevents the sealing ring from rupturing due to rapid pressure changes during docking, which could lead to insulation degradation and logging failure, making the instrument more suitable for use under high-temperature and high-pressure conditions. However, the existing wet connector requires oil filling at the factory, and the oil filling effect is not good. After oil filling with the existing connector, the oil in the instrument's balancer chamber can spray or overflow under pressure during connector disassembly, which can easily cause inaccurate pre-pressure in the balancer chamber. The sprayed oil can also easily contaminate the equipment, and may also cause injury to the operator and environmental pollution. Summary of the Invention

[0004] The purpose of this invention is to provide a downhole wet joint tooling device and an oil injection method to solve the problems of poor oil injection effect of the oil injection joint in the prior art, and the oil in the instrument balancer cavity is prone to spraying or overflowing under pressure after oil injection.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention provides a downhole wet joint tooling device, comprising:

[0007] A wet connector female includes a shell, an outer capsule, and an inner capsule. One end of the shell is provided with an oil inlet. The outer capsule is fixed inside the shell, and the internal space of the outer capsule is divided into an outer oil cavity, an inner oil cavity, and an outer capsule oil cavity by a frame structure along the direction from the oil inlet end of the wet connector female to the other end. The inner capsule is fixed inside the outer capsule oil cavity and is connected to the inner oil cavity. An internal flow channel connecting the outer capsule oil cavity and the outer oil cavity is provided on the frame structure.

[0008] The tooling assembly includes a separate oil injection tooling and a refill tooling. The oil injection tooling has an oil injection pin, on which a first oil injection hole and a second oil injection hole are respectively opened along the direction from its tip to its end. The first oil injection hole is interconnected with the inner oil cavity, and the second oil injection hole is interconnected with the outer oil cavity. The refill tooling has a refill pin, on which a refill hole is opened, and the refill hole is interconnected with the inner oil cavity.

[0009] Furthermore, the oiling fixture has an oiling pin, on which a first oiling hole and a second oiling hole are respectively opened along the direction from its tip to its end. The first oiling hole is interconnected with the inner oil cavity, and the second oiling hole is interconnected with the outer oil cavity. The oil replenishing fixture has an oil replenishing pin, on which an oil replenishing hole is opened. The oil replenishing hole is interconnected with the inner oil cavity.

[0010] Furthermore, the oil injection fixture includes an oil injection base platform and a plurality of oil injection pins. An oil injection sealing cavity is formed inside the oil injection base platform. An oil injection inlet communicating with the oil injection sealing cavity is opened on one side of the platform. The plurality of oil injection pins are fixed on the other side of the platform. The oil injection pins have a hollow cavity structure and are interconnected with the oil injection sealing cavity. The first oil injection hole and the second oil injection hole are both opened on the outer wall of the oil injection pin.

[0011] Furthermore, the oiling fixture includes an oiling base platform and several oiling pins. An oiling sealing cavity is formed inside the oiling base platform. An oiling inlet communicating with the oiling sealing cavity is opened on one side of the platform. Several oiling pins are fixed on the other side of the platform. The oiling pins have a hollow cavity structure and are interconnected with the oiling sealing cavity. The oiling hole is opened on the outer wall of the oiling pin.

[0012] Furthermore, a conductive copper sleeve is horizontally arranged inside the inner oil cavity. A sliding cavity is formed inside the conductive copper sleeve, and a sliding opening is formed on the end of the conductive copper sleeve near the outer oil cavity. A piston is arranged inside the sliding opening, and the piston is slidably disposed between the outer oil cavity and the inner oil cavity. The other end of the conductive copper sleeve is fixedly connected to the inner capsule. A spring is arranged inside the conductive copper sleeve. One end of the spring is fixed inside the conductive copper sleeve, and the other end of the spring is connected to the piston.

[0013] Furthermore, the frame structure has a horizontal sliding hole on the wall between the outer oil cavity and the inner oil cavity. The piston is slidably disposed in the sliding hole, and the spring is in an uncompressed state. One end of the piston is placed in the conductive copper sleeve, and the other end of the piston is placed at the oil inlet. The frame structure has a horizontal fixing hole on the wall between the outer capsule oil cavity and the inner oil cavity. One end of the inner capsule is fixed in the fixing hole, and the fixed end of the inner capsule is interconnected with the inner oil cavity.

[0014] Furthermore, sealing rings are provided in the oil inlet, the sliding hole, and the fixing hole.

[0015] Furthermore, the outer capsule and the shell are fitted together, and the outer wall of the outer capsule is fixed to the inner wall of the shell. A conductive copper core is provided at the end of the shell away from the oil inlet, and the conductive copper core is connected to the end of the inner capsule away from the conductive copper sleeve.

[0016] Furthermore, the shell has a columnar structure, and several inner capsules are arranged along the circumference of the shell inside the outer capsule. Each inner capsule corresponds to a set of conductive copper sleeve structures, and several inner capsules correspond one-to-one with several oil injection pins or oil replenishment pins.

[0017] Based on the above-mentioned downhole wet joint tooling device, the present invention also provides an oil injection method, including:

[0018] Place the wet connector female into the vacuum tank, and simultaneously insert the oil filling tool into the wet connector female;

[0019] The vacuum tank is evacuated as a whole, and then the vacuum tank is filled with oil as a whole. The oil filling of the outer capsule and the inner capsule is completed based on the pressure difference inside and outside the wet connector.

[0020] Remove the wet connector female head and the oiling tool. After cleaning the wet connector female head, insert the oil replenishing tool again and replenish the inner capsule with oil through the oil replenishing tool. Let A be the volume formed after the inner capsule is filled with oil, then A < oil replenishment amount < 2A.

[0021] The present invention, by adopting the above technical solution, has the following beneficial effects:

[0022] By setting a double-layer capsule structure for the wet connector female head, and equipping it with matching oil injection and replenishment fixtures, the wet connector female head is first oiled under vacuum. The first and second oil injection holes on the oil injection pins are used to inject oil into the outer and inner capsules respectively. After reaching the preset value, the inner capsule is replenished with oil under normal conditions to achieve a slightly full state, ensuring that the inner capsule is filled with insulating oil. When the wet connector female head is connected, the insulating oil in the inner oil cavity is compressed and enters the inner capsule, causing the inner capsule to expand and deform outwards. This pressure is transmitted to the outer capsule, increasing the pressure of the insulating oil inside the outer capsule. The deformation of the inner capsule achieves pressure balance between the inside and outside, preventing the joint from rupturing due to rapid pressure changes during connection, which could lead to spraying or overflow. Attached Figure Description

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. In the drawings:

[0024] Figure 1 This is a schematic diagram of the oil injection state structure of a downhole wet joint tooling device provided in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the oil replenishment state structure of a downhole wet joint tooling device provided in an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the overall structure of the wet connector female head of a downhole wet connector tooling device provided in an embodiment of the present invention.

[0027] The markings in the attached diagram are as follows:

[0028] 1. Wet connector female; 11. Housing; 111. Oil inlet; 12. Outer capsule; 13. Inner capsule; 14. Frame structure; 15. Outer oil cavity; 16. Inner oil cavity; 17. Outer capsule oil cavity; 18. Internal flow channel; 2. Tooling assembly; 21. Oil filling tool; 211. Oil filling pin; 212. First oil filling hole; 213. Second oil filling hole; 214. Oil filling base platform; 22. Oil replenishment tool; 221. Oil replenishment pin; 222. Oil replenishment hole; 223. Oil replenishment base platform; 3. Conductive copper; 31. Piston; 32. Spring; 4. Sealing ring; 5. Conductive copper core. Detailed Implementation

[0029] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0030] Traditional oil injection connectors have poor oil injection performance, and the oil in the instrument balancer chamber is prone to spraying or overflowing under pressure after injection. This invention provides a downhole wet connector tooling device and oil injection method, including a wet connector female head and tooling components. The wet connector female head includes a shell, an outer capsule, and an inner capsule. The outer capsule is fixed inside the shell, and its internal space is sequentially divided into an outer oil cavity, an inner oil cavity, and an outer capsule oil cavity along the direction from the injection end to the other end of the wet connector female head by a frame structure. The inner capsule is fixed inside the outer capsule oil cavity and is connected to the inner oil cavity. An internal flow channel connecting the outer capsule oil cavity and the outer oil cavity is provided on the frame structure. The tooling components include an oil injection tooling and an oil replenishment tooling with a pin. The method involves first injecting oil into the wet connector female head under vacuum, and then replenishing oil to the inner capsule under normal conditions using an oil replenishing tool. This achieves internal and external pressure balance through the deformation of the inner capsule, avoiding the problem of joint rupture and spraying or overflow caused by rapid pressure changes during wet connector female head docking.

[0031] The present invention will be described in detail below through embodiments.

[0032] Example

[0033] like Figures 1-3 As shown, the present invention provides a downhole wet joint tooling device including a wet joint female head 1 and a tooling assembly 2, the specific configuration of which is as follows:

[0034] The wet connector female head 1 includes a housing 11, an outer capsule 12, and an inner capsule 13. One end of the housing 11 has an oil inlet 111. The outer capsule 12 is fixed inside the housing 11, and its internal space is sequentially divided into an outer oil cavity 15, an inner oil cavity 16, and an outer capsule oil cavity 17 along the direction from the oil inlet end to the other end of the wet connector female head 1 by a frame structure 14. The inner capsule 13 is fixed inside the outer capsule oil cavity 17, and is connected to the inner oil cavity 16. An internal flow channel 18 connecting the outer capsule oil cavity 17 and the outer oil cavity 15 is provided on the frame structure 14. The tooling assembly 2 includes a separate oil filling tool 21 and a refill tool 22. The oil filling tool 21 has an oil filling pin 211, on which a first oil filling hole 212 and a second oil filling hole 213 are respectively opened along the direction from its tip to its end. The first oil injection hole 212 is interconnected with the inner oil cavity 16, and the second oil injection hole 213 is interconnected with the outer oil cavity 15. The oil replenishment fixture 22 has an oil replenishment pin 221, on which an oil replenishment hole 222 is opened, and the oil replenishment hole 222 is interconnected with the inner oil cavity 16.

[0035] Furthermore, the oiling fixture 21 includes an oiling base platform 214 and several oiling pins 211. An oiling sealing cavity is formed within the oiling base platform 214, and an oiling inlet communicating with the oiling sealing cavity is provided on one side of the platform. Several oiling pins 211 are fixed to the other side of the platform. Each oiling pin 211 has a hollow cavity structure and is interconnected with the oiling sealing cavity. The first oiling hole 212 and the second oiling hole 213 are both located on the outer wall of the oiling pin 211.

[0036] Furthermore, the oiling fixture 22 includes an oiling base platform 223 and several oiling pins 221. An oiling sealing cavity is formed within the oiling base platform 223, and an oiling inlet communicating with the oiling sealing cavity is provided on one side of the platform. Several oiling pins 221 are fixed to the other side of the platform. Each oiling pin 221 has a hollow structure and is interconnected with the oiling sealing cavity. Oiling holes 222 are formed on the outer wall of the oiling pins 221.

[0037] With the above structure, the first oil injection hole 212 and the second oil injection hole 213 on the oil injection pin 211 are used to inject oil into the outer capsule 12 and the inner capsule 13 respectively. After reaching the preset value, the inner capsule 13 only needs to be replenished with oil using the oil replenishing tool 22 under normal conditions to make it slightly full, so as to ensure that the inner capsule 13 is filled with insulating oil. Thus, the internal and external pressure balance can be achieved through the deformation of the inner capsule 13.

[0038] Furthermore, a conductive copper sleeve 3 is horizontally disposed within the inner oil cavity 16. A sliding cavity is formed inside the conductive copper sleeve 3, and a sliding opening is formed at the end of the conductive copper sleeve 3 near the outer oil cavity 15. A piston 31 is disposed within the sliding opening, and the piston 31 is slidably disposed between the outer oil cavity 15 and the inner oil cavity 16. The other end of the conductive copper sleeve 3 is fixedly connected to the inner capsule 13. A spring 32 is disposed within the conductive copper sleeve 3, one end of the spring 32 is fixed within the conductive copper sleeve 3, and the other end of the spring 32 is connected to the piston 31.

[0039] Furthermore, a horizontal sliding hole is provided on the frame structure 14 between the outer oil cavity 15 and the inner oil cavity 16. The piston 31 is slidably disposed in the sliding hole, and the spring 32 is in an uncompressed state. One end of the piston 31 is placed inside the conductive copper sleeve 3, and the other end of the piston 31 is placed at the oil inlet 111. A horizontal fixing hole is provided on the frame structure 14 between the outer capsule oil cavity 17 and the inner oil cavity 16. One end of the inner capsule 13 is fixed in the fixing hole, and the fixed end of the inner capsule 13 is interconnected with the inner oil cavity 16. Sealing rings 4 are provided in the oil inlet 111, the sliding hole, and the fixing hole.

[0040] With the above structure, when oil is injected or replenished, the pin of the oil injection tool 21 or the oil replenishment tool 22 is inserted along the oil injection port 111 and pushes the piston 31 to move into the conductive copper sleeve 3, so that the first oil injection hole 212 or the oil replenishment hole 222 is placed inside the conductive copper sleeve 3, and the second oil injection hole 213 is placed inside the outer oil cavity 15. During the oil injection or replenishment process, the insulating oil enters the conductive copper sleeve 3 through the first oil injection hole 212 or the oil replenishment hole 222, and after being compressed by the piston 31, it flows from the sliding port of the conductive copper sleeve 3 or the gap between the conductive copper sleeve 3 and the plug 31 to the inner oil cavity 16, and then enters the inner capsule 13. The insulating oil enters the outer capsule oil cavity 17 through the outer oil cavity 15 and the internal flow channel 18. The process involves first injecting oil into the wet connector female 1 under vacuum, and then replenishing the inner bladder 13 with oil using the oil replenishing fixture 22 under normal conditions. This ensures that the inner bladder 13 is slightly filled with insulating oil. Here, "slightly filled" means that if the volume formed after oil injection in the inner bladder is A, then A < oil replenishment amount < 2A. Furthermore, when the oil injection fixture 21 or the oil replenishing fixture 22 is withdrawn, the piston 31, under the reset action of the spring 32, seals the oil injection port 111 and isolates it from the outside environment.

[0041] Furthermore, the outer capsule 12 and the shell 11 are fitted together, and the outer wall of the outer capsule 12 is fixed to the inner wall of the shell 11. A conductive copper core 5 is provided at the end of the shell 11 away from the oil inlet 111, and the conductive copper core 5 is connected to the end of the inner capsule 13 away from the conductive copper sleeve 3.

[0042] Furthermore, the shell 11 has a columnar structure, and several inner capsules 13 are arranged in the outer capsule 12 along the circumference of the shell 11. Each inner capsule 13 corresponds to a set of conductive copper sleeve 3 structures, and several inner capsules 13 correspond one-to-one with several oil injection pins 211 or oil replenishment pins 221.

[0043] Based on the above-mentioned downhole wet joint tooling device, the present invention also provides an oil injection method, including:

[0044] Place the wet connector female 1 into the vacuum tank, and at the same time insert the oil filling tool 21 into the wet connector female 1;

[0045] The vacuum tank is evacuated as a whole, and then the vacuum tank is filled with oil as a whole. The oil filling of the outer capsule 12 and the inner capsule 13 is completed based on the pressure difference inside and outside the wet connector 1.

[0046] Remove the wet connector female head 1 and remove the oiling tool 21. After cleaning the wet connector female head 1, insert the oil replenishing tool 22 and replenish the inner capsule 13 with oil through the oil replenishing tool 22. Let the volume formed after the inner capsule 13 is filled with oil be A, then A < oil replenishment amount < 2A.

[0047] In the present invention, a downhole wet joint tooling device and oil injection method are provided. When the wet joint female head 1 is connected, the insulating oil in the inner oil cavity 16 is compressed and enters the inner capsule 13, causing the inner capsule 13 to expand and deform outward. The pressure is transmitted to the outer capsule 12 outside the inner capsule 13, which increases the pressure of the insulating oil in the outer capsule 12. Thus, the deformation of the inner capsule 13 achieves the balance of internal and external pressure, avoiding the problem of joint rupture and jetting or overflow caused by rapid pressure changes when the wet joint female head 1 is connected.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tooling device for a downhole wet joint, characterized in that, The downhole wet joint tooling includes: A wet connector female includes a shell, an outer capsule, and an inner capsule. One end of the shell is provided with an oil inlet. The outer capsule is fixed inside the shell, and the internal space of the outer capsule is divided into an outer oil cavity, an inner oil cavity, and an outer capsule oil cavity by a frame structure along the direction from the oil inlet end of the wet connector female to the other end. The inner capsule is fixed inside the outer capsule oil cavity and is connected to the inner oil cavity. An internal flow channel connecting the outer capsule oil cavity and the outer oil cavity is provided on the frame structure. The tooling assembly includes a separate oiling tool and a replenishing tool. The oiling tool has an oiling pin, and the oiling pin has a first oiling hole and a second oiling hole respectively opened along the direction from its tip to its end. The first oiling hole is interconnected with the inner oil cavity, and the second oiling hole is interconnected with the outer oil cavity. The replenishing tool has a replenishing pin, and the replenishing pin has a replenishing hole opened on it. The replenishing hole is interconnected with the inner oil cavity. The oil injection fixture includes an oil injection base platform and several oil injection pins. An oil injection sealing cavity is formed inside the oil injection base platform. An oil injection inlet communicating with the oil injection sealing cavity is opened on one side of the oil injection base platform. Several oil injection pins are fixed on the other side of the oil injection base platform. The oil injection pins have a hollow structure and are interconnected with the oil injection sealing cavity. The first oil injection hole and the second oil injection hole are both opened on the outer wall of the oil injection pin. The oiling fixture includes an oiling base platform and several oiling pins. An oiling sealing cavity is formed inside the oiling base platform. An oiling inlet communicating with the oiling sealing cavity is opened on one side of the platform. Several oiling pins are fixed on the other side of the platform. The oiling pins have a hollow structure and are interconnected with the oiling sealing cavity. The oiling hole is opened on the outer wall of the oiling pin.

2. The downhole wet joint tooling device according to claim 1, characterized in that: A conductive copper sleeve is horizontally arranged inside the inner oil cavity. A sliding cavity is formed inside the conductive copper sleeve, and a sliding opening is formed on the end of the conductive copper sleeve near the outer oil cavity. A piston is arranged in the sliding opening, and the piston is slidably disposed between the outer oil cavity and the inner oil cavity. The other end of the conductive copper sleeve is fixedly connected to the inner capsule. A spring is arranged inside the conductive copper sleeve. One end of the spring is fixed inside the conductive copper sleeve, and the other end of the spring is connected to the piston.

3. The downhole wet joint tooling device according to claim 2, characterized in that: The frame structure has a horizontal sliding hole on the wall between the outer oil cavity and the inner oil cavity. The piston is slidably disposed in the sliding hole, and the spring is in an uncompressed state. One end of the piston is placed in the conductive copper sleeve, and the other end of the piston is placed at the oil inlet. The frame structure has a horizontal fixing hole on the wall between the outer capsule oil cavity and the inner oil cavity. One end of the inner capsule is fixed in the fixing hole, and the fixed end of the inner capsule is interconnected with the inner oil cavity.

4. The downhole wet joint tooling device according to claim 3, characterized in that: The oil inlet, the sliding hole, and the fixing hole are all equipped with sealing rings.

5. The downhole wet joint tooling device according to claim 4, characterized in that: The outer capsule and the shell are fitted together, and the outer wall of the outer capsule is fixed to the inner wall of the shell. A conductive copper core is provided at the end of the shell away from the oil inlet, and the conductive copper core is connected to the end of the inner capsule away from the conductive copper sleeve.

6. The downhole wet joint tooling device according to claim 5, characterized in that: The shell has a columnar structure, and several inner capsules are arranged along the circumference of the shell inside the outer capsule. Each inner capsule corresponds to a set of conductive copper sleeve structures, and several inner capsules correspond one-to-one with several oil injection pins or oil replenishment pins.

7. An oil injection method, employing the downhole wet joint tooling device as described in any one of claims 1-6, characterized in that, The oil injection method includes: Place the wet connector female into the vacuum tank, and simultaneously insert the oil filling tool into the wet connector female; The vacuum tank is evacuated as a whole, and then the vacuum tank is filled with oil as a whole. The oil filling of the outer capsule and the inner capsule is completed based on the pressure difference inside and outside the wet connector. Remove the wet connector female head and the oiling tool. After cleaning the wet connector female head, insert the oil replenishing tool again and replenish the inner capsule with oil through the oil replenishing tool. Let A be the volume formed after the inner capsule is filled with oil, then A < oil replenishment amount < 2A.

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