A multifunctional intermediate control joint

Abstract

The present invention discloses a multifunctional intermediate control joint, which specifically relates to the technical field of oil extraction. The technical solution is: to provide a multifunctional intermediate control joint, wherein the control short section, joint and control long section of the joint are connected by connecting rings and elastic nuts, and the control short section and control long section are fixed with connecting blocks, and a selective firing switch is provided in the joint to solve the problem of casing jamming the fracturing tool; further solve the single firing problem of the intermediate control joint; and further solve the compatibility problem of the connecting components with the perforating gun and the sealing tool. The beneficial effects of the present invention are: since the elastic nut and the connecting ring are made of elastic material, the entire intermediate control joint is flexible, and it can pass more easily when encountering an arc at the bottom of the well; secondly, the present invention is provided with a selective firing switch, which can simultaneously control the operation of the perforating gun and the sealing tool, which is more convenient and quick; the plug-in connection and threaded connection of the connecting block greatly improve the installation efficiency of the product.

Description

Technical Field

[0001] The invention relates to the field of petroleum exploitation, and in particular to a multifunctional intermediate control joint. Background Art

[0002] Bridge-shooting joint work is an important part of oil exploration. This technology uses cable-transmitted pumping perforators and bridge plugs to temporarily isolate the fractured well section, and perforate the unfractured well section to provide channel conditions for fluid injection into the bottom layer for hydraulic fracturing. Hydraulic fracturing is currently the main application method of fracturing to increase production in China, and the market prospects are huge and broad. Therefore, the necessary tools for hydraulic fracturing technology, such as perforating guns, sealing tools, bridge plugs, and connecting components, have very broad application prospects and huge potential markets.

[0003] The prior art has the following deficiencies:

[0004] 1. When lowering or lifting perforating guns and other fracturing tools in horizontal wells, the casing may get stuck in the fracturing tools when there is an arc in the wellbore;

[0005] 2. The ignition selection system can only identify a single ignition system and does not have any compatibility or ability to identify other products;

[0006] 3. The existing connection parts have a single connection method, which is just threaded connection. At the same time, the connection parts are only the connection between the perforating guns, and cannot connect the perforating guns and the setting tools. The compatibility of the connection parts is poor;

[0007] Therefore, it is necessary to invent a multifunctional intermediate control joint. Summary of the invention

[0008] To this end, the present invention provides a multifunctional intermediate control joint to solve the problems existing in the prior art. The control short section, joint and control long section of the joint are connected by connecting rings and elastic nuts, and the control short section and control long section are fixed with connecting blocks, and a selective firing switch is provided in the joint to solve the problem of casing jamming the fracturing tool; further solve the single firing problem of the intermediate control joint; and further solve the compatibility problem of the connecting components with the perforating gun and the setting tool.

[0009] In view of the above technical problems, the present invention provides the following technical solutions: a multifunctional intermediate control joint, comprising a central control short section, a central control long section, a first connecting ring, a second connecting ring and a joint, and also comprising a connecting block and an elastic nut, wherein the connecting block is fixedly installed on the end of the central control short section and the central control long section away from the joint, and has a connecting function; the elastic nut is provided with threads on the inner and outer sides, the outer sides of both ends of the joint are provided with external threads, and the inner sides of the ends of the central control short section and the central control long section close to the joint are provided with internal threads; the first connecting ring and the second connecting ring are buckled on the joint, and the elastic nut is arranged on the joint; the central control short section and the central control long section are arranged on the elastic nut, and fit tightly with the joint, the first connecting ring and the second connecting ring.

[0010] Preferably, the connection block is provided with two annular grooves and an external thread, and the external thread is arranged in the middle of the two annular grooves.

[0011] Preferably, a sealing ring is provided on the outer wall of the connecting block, and the sealing ring is a rotating sealing ring.

[0012] Preferably, the joint is a hollow variable outer diameter ring, in which a three-core terminal and a selection switch are sequentially connected in series, an elastic connector is installed inside the short section of the central control, the left end of the elastic connector is connected to the selection switch, a waterproof assembly is installed inside the long section of the central control, and a three-core terminal is installed at the right end of the waterproof assembly.

[0013] Preferably, the first connecting ring and the second connecting ring are each composed of two half variable outer diameter circular rings, and the maximum outer diameter of the two half variable outer diameter circular rings is equal to the maximum outer diameter of the joint, and the second outer diameter is equal to the outer diameter of the elastic nut.

[0014] Preferably, a sub-end groove and a female end groove are provided at both ends of the connection block, and a connector is fixedly installed inside the sub-end groove.

[0015] Preferably, a socket is provided at the side end of the central control section.

[0016] Preferably, a buckle groove is provided at the side end of the joint.

[0017] Preferably, the short center control section and the long center control section are made of special alloy steel.

[0018] Preferably, the inner diameters of the sub-end groove and the female-end groove are the same.

[0019] The beneficial effects of the present invention are:

[0020] 1. The elastic nut and the connecting ring in the present invention can play the role of sealing the joint, the short middle control joint and the long middle control joint, preventing the downhole fluid from entering the middle control joint. At the same time, since the elastic nut and the connecting ring are made of elastic material, the entire middle control joint is flexible, and it can pass more easily when encountering an arc at the bottom of the well, which greatly improves the passability of other tools connected to the middle control joint and makes it less likely to get stuck in the casing.

[0021] 2. In the present invention, since a selective firing switch is provided in the joint, the perforating gun can be controlled to perform perforation and the sealing tool can be controlled to eject the bridge plug during hydraulic fracturing and other operations, which is more convenient and quick.

[0022] 3. The connecting block is fixedly installed at both ends of the short center control section and the long center control section. Both ends of the connecting block adopt plug-in connection and threaded rotation connection. The connecting block has the function of convenient plug-in connection with the perforating gun or the sealing tool, thereby improving the installation efficiency of the product. A sealing ring is installed on the outer wall of the connecting block. The sealing ring has the function of improving the sealing of the product. The sealing ring is provided with a rotating sealing ring, which can be used with different connection methods as needed to reduce the operating cost. Sub-end grooves and female end grooves are provided at both ends of the connecting block. The sub-end grooves and female end grooves have the function of connecting the perforating gun. A connecting head is fixedly installed inside the sub-end groove. The connecting head has the function of connecting the perforating gun. Plug-in connection, threaded rotation connection, and sealing ring are adopted to improve the sealing, installation efficiency, reuse rate, stability and compatibility of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the intermediate control joint of the present invention;

[0024] Figure 2 It is a schematic diagram of the overall structure of the intermediate control joint of the present invention;

[0025] Figure 3 It is a front view of the sealing ring of the present invention;

[0026] Figure 4 It is an exploded view of the intermediate control joint of the present invention.

[0027] In the figure: central control short section 1, first connecting ring 11, second connecting ring 14, joint 12, buckle groove 13, elastic nut 2, sealing ring 21, connecting block 22, annular groove 221 / 222, external thread 223, sub-end groove 23, connecting head 24, central control long section 3, jack 31, female end groove 32, waterproof assembly 4, three-core terminal 5, selector switch 6, elastic connector 7. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0029] See attached Figure 1-Figure 4

[0030] The present invention provides a multifunctional intermediate control joint, comprising a central control short section 1, a central control long section 3, a first connecting ring 11, a second connecting ring 14 and a joint 12, and further comprising a connecting block 22 and an elastic nut 2, wherein the connecting block 22 is fixedly mounted on one end of the central control short section 1 and the central control long section 3 away from the joint 12, the elastic nut 2 is provided with threads on the inner and outer sides, the outer sides of both ends of the joint 12 are provided with external threads, and the inner sides of one end of the central control short section 1 and the central control long section 3 close to the joint are provided with internal threads; the connecting block 22 can be plug-in connected or rotatably connected with the upper and lower perforating guns; the first connecting ring 11 and the second connecting ring 14 are sleeved on both ends of the joint 12, the elastic nut 2 is arranged on the joint 12, the central control short section 1 and the central control long section 3 are arranged on the elastic nut, and are tightly fitted with the joint 12, the first connecting ring 11 and the second connecting ring 14;

[0031] Furthermore, the connecting block 22 is provided with two annular grooves 221 / 222 and an external thread 223. The external thread 223 is arranged in the middle of the two annular grooves. The groove depth of the annular groove 222 is deeper than that of the annular groove 221. This arrangement can be well connected to the perforating gun. If necessary, dual connection of threaded connection and plug-in connection can be achieved, which greatly enhances the stability of the connection of the intermediate control joint.

[0032] Furthermore, the connector 12 is a hollow variable outer diameter ring, in which a three-core terminal 5 and a selector switch 6 are sequentially connected in series;

[0033] Furthermore, an elastic connector 7 is installed inside the central control short section 1, and the left end of the elastic connector 7 is connected to the selection switch 6. A waterproof assembly 4 is installed inside the central control long section 3, and a three-core terminal 5 is installed at the right end of the waterproof assembly 4. The elastic connector 7 is connected to the sealing tool or the perforating gun, and plays the role of adaptive connection. The selection switch 6 is composed of large-scale digital circuits and control software, which can realize the intelligent selection of the perforating gun, automatic identification of detonator types, signal faults, grounding faults and other inspection functions, and is the core structure of the control system. The waterproof assembly 4 is used to prevent the downhole liquid from entering the control system under normal pressure and affecting the selection switch 6 to cause a short circuit. At the same time, it can also prevent the perforating gun from blasting and generating shock waves to impact the internal structure of the control unit during operation, thereby strengthening the protection of the selection switch 6. The three-core terminal 5 is used to connect the waterproof assembly 4 and the selection switch 6, and plays the role of adaptive connection. Secondly, since the central control short section 1 and the central control long section 3 are hollow cylindrical objects, it is convenient for cables or connectors to pass through;

[0034] Furthermore, the first connecting ring 11 and the second connecting ring 14 are composed of two half variable outer diameter circular rings, and the maximum outer diameter of the two half variable outer diameter circular rings is equal to the maximum outer diameter of the joint 12, and the second outer diameter is equal to the outer diameter of the elastic nut 2.

[0035] Furthermore, a sealing ring 21 can be installed on the outer wall of the connecting block 22, and the external thread 223 can also be a special external thread, the pitch of the special external thread is 10mm, and the difference between the outer diameter and the inner diameter is 20mm. The sealing ring 21 can also be a special rotating sealing ring corresponding to the special thread, so that the sealing ring 21 can be set in the screw groove of the external thread 223; because the connecting block 22 is also provided with a groove 221 / 222, when plugging and unplugging the perforating gun or the setting tool, the protrusion of the perforating gun can be stuck in the groove of the connecting block 22, that is, space is saved and sealing can be achieved; at the same time, if the perforating gun or the setting tool is When the tool is rotatably connected with the connection block, the sealing ring 21 can be placed in the innermost groove 222 of the plug block 22, thereby playing a sealing role; the two ends of the connection block 22 are also provided with a sub-end groove 23 and a female end groove 32, and the connector 24 is fixedly installed inside the sub-end groove 23. The sealing ring 21 can be set with a number of layers as needed, preferably consistent with the number of layers of the external thread, so that the reuse rate of the product can be improved, so that the product can ensure the sealing performance while also improving the practicality. The sub-end groove 23 and the female end groove 32 have the function of connecting the perforating gun or the setting tool, and the connector 24 has the function of connecting the perforating gun or the setting tool;

[0036] Furthermore, the inner half of the elastic nut 2 is provided with an internal thread, and the inner diameter of the half and the inner diameter of the other half may be different, so that the elastic nut 2 stops being screwed in when it is screwed into a certain position, which has a limiting effect. At the same time, since the elastic nut 2 is connected to the joint 12, the outer side of the elastic nut also has an internal thread. In order to prevent the elastic nut 2 from rotating due to the friction when the central control long section 3 or the central control short circuit 1 is screwed onto the elastic nut 2, the inner diameter of the elastic nut 2 is set to different inner diameters, and the inner diameter of the elastic nut 12 is set to be larger than the inner diameter not connected to the joint 12. This can prevent the elastic nut 2 from rotating and can also play a role in sealing the joint.

[0037] Furthermore, a socket 31 is provided at the side end of the central control section 3, and the socket 31 has the function of conveniently connecting an ignition device (such as a selective ignition switch), thereby improving the compatibility of the product;

[0038] Furthermore, a buckle groove 13 is provided at the side end of the joint 12, and the buckle groove 13 has the function of facilitating the rotation of the built-in initiator 12;

[0039] Furthermore, the central control short section 1 and the central control long section 3 are set to special alloy steel, which is 40% lighter than the old material, but the material strength is not reduced at all. The lighter weight can be more convenient for front-line workers to use, easy to carry and install;

[0040] Furthermore, the inner diameters of the sub-end groove 23 and the female-end groove 32 are the same;

[0041] Furthermore, the socket 31 is set to be hexagonal, and the socket 31 is connected to the outside world in a plug-in manner, which facilitates the plug-in and pull-out of the ignition device and improves the compatibility of the product;

[0042] Furthermore, the outer diameters of the central control short section 1 and the central control long section 3 are the same, which facilitates the transportation and installation of the central control short section 1 and the central control long section 3 and improves the installation efficiency of the product;

[0043] Furthermore, the first connecting ring 11 and the second connecting ring 14 are made of an elastic material, which may be fluororubber, nitrile rubber or fluorocarbon rubber, or a rubber prepared according to a specific operation, such as a mixture of silicone rubber, fluororubber and polyurethane, or raw rubber, a vulcanization system, a reinforcing agent, a protective system and a plasticizer may be added as needed;

[0044] Further, the elastic nut 2 is made of the same material as the first connecting ring 11 and the second connecting ring 14. Two holes are provided on the large circular sector surface of the first connecting ring 11 and the second connecting ring 14, and corresponding threaded holes are provided on the circular surface of the joint 12. When assembling the intermediate control joint, the first connecting ring 11 and the second connecting ring 14 are respectively connected to the two sides of the joint by bolts;

[0045] The use process of the present invention is as follows: the first step is to connect the three-core terminal 5 of the selective switch 6 in the connector 12 as needed, and other control circuits can also be added as needed; the second step is to connect the two elastic nuts 2 to the two ends of the connector 12 respectively. Since the inner diameters of the elastic nuts 2 are different, when the elastic nuts are screwed into the two ends of the connector 12, they must be screwed into a specific position due to the change in the inner diameter; the third step is to buckle the first connecting ring 11 and the second connecting ring 14 on the connector 12, and adjust their positions so that they are not separated from the side wall of the connector 12 and the elastic nuts 2. gap, and then screw the four fan-shaped connecting rings into the side wall of the joint 12; the fourth step, install the elastic connector 7 inside the central control short section 1, install the waterproof assembly 4 inside the central control long section 3, and then connect the left end of the elastic connector 7 to the control circuit assembly 6, and install the three-core terminal 5 on the right end of the waterproof assembly 4; the fifth step, screw the central control short section 1 and the central control long section 3 into the elastic nuts on the joint 12 respectively, until the joint 12, the connecting ring, the central control short section 1 and the central control long section 3 are tightly fitted; the last step, connect the multifunctional intermediate joint to the perforating gun or the sealing tool through the connecting block 22.

[0046] Since the elastic connector 7 and the waterproof assembly 4 have certain elasticity, they can better fit with the elastic nut 2, thereby producing better sealing. Therefore, the multifunctional intermediate joint of the present invention has better waterproofness and more stable connection or ignition performance.

[0047] The above is only a preferred embodiment of the present invention. Any person skilled in the art may modify the present invention by using the above technical solution or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent replacement made according to the technical solution of the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A multifunctional intermediate control joint, comprising a short central control joint (1), a long central control joint (3), a first connecting ring (11), a second connecting ring (14) and a joint (12), characterized in that: It also includes a connecting block (22) and an elastic nut (2), wherein the connecting block (22) is fixedly mounted on one end of the central control short section (1) and the central control long section (3) away from the joint (12) and has a connecting function; the elastic nut (2) is provided with threads on the inside and outside, and both ends of the joint (12) are provided with external threads on the outside, and the inner sides of one end of the central control short section (1) and the central control long section (3) close to the joint (12) are provided with internal threads; the first connecting ring (11) and the second connecting ring (14) are snap-fitted on the joint (12), and the elastic nut (2) is arranged on the joint (12); the central control short section (1) and the central control long section (3) are arranged on the elastic The elastic nut (2) is mounted on the central control section (1) and is tightly fitted with the joint (12), the first connecting ring (11) and the second connecting ring (14); the joint (12) is a hollow variable outer diameter circular ring, in which a three-core terminal (5) and a selector switch (6) are arranged in series in sequence; an elastic connector (7) is installed inside the central control section (1), and the left end of the elastic connector (7) is connected to the selector switch (6); a waterproof assembly (4) is installed inside the central control section (3), and the right end of the waterproof assembly (4) is installed with a three-core terminal (5); the elastic nut (2) and the first connecting ring (11) and the second connecting ring (14) are made of elastic material.

2. The multifunctional intermediate control joint according to claim 1, characterized in that: The connection block (22) is provided with two annular grooves (221 / 222) and an external thread (223), and the external thread (223) is arranged in the middle of the two annular grooves (221 / 222).

3. The multifunctional intermediate control joint according to claim 1, characterized in that: A sealing ring (21) is provided on the outer wall of the connection block (22), and the sealing ring (21) is a rotating sealing ring.

4. The multifunctional intermediate control joint according to claim 1, characterized in that: The connecting block (22) has a sub-end groove (23) and a female end groove (32) at both ends, and a connecting head (24) is fixedly installed inside the sub-end groove (23).

5. The multifunctional intermediate control joint according to claim 1, characterized in that: The side end of the central control long section (3) is provided with a plug hole (31).

6. The multifunctional intermediate control joint according to claim 1, characterized in that: A buckle groove (13) is provided at the side end of the joint (12).

7. The multifunctional intermediate control joint according to claim 1, characterized in that: The central control short section (1) and the central control long section (3) are made of special alloy steel.

8. The multifunctional intermediate control joint according to claim 4, characterized in that: The inner diameters of the sub-end groove (23) and the female-end groove (32) are the same.

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