Anti-spitting and anti-spraying water distributor

Abstract

The water distributor comprises a working barrel, a main body, a connecting sleeve and a lower connector, the main body is sleeved with an upper magnetic ring, a lower magnetic ring, a piston and an upper sealing gasket, the main body is in threaded connection with a limiting ring, the main body is arranged in the working barrel, and a sealing cavity is formed by the main body, the working barrel and the piston; the upper magnetic ring and the lower magnetic ring are located in a sealing cavity, the main body is connected with the centralizing body in a welded mode, the pressure relief rod is arranged in an eccentric hole of the main body, the fixing ring is connected with the main body through threads, the lower sealing gasket is arranged in the fixing ring and the standby cap, the working barrel is connected with the connecting sleeve through threads, and the connecting sleeve is connected with the lower connector through threads. And the guide sleeve is connected with the lower joint through a screw. The anti-spitting and anti-spraying water distributor has the characteristics that the pipe lifting column does not spray a pipe, and the anti-spitting function is not invalid, so that the safety of construction operation can be ensured, and the environment-friendly requirement can be met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oilfield production tools, in particular to a kind of anti-spitting anti-blowout water distributor. BACKGROUND

[0002] Water distributor is a special downhole tool used in stratified water injection operation in the field of oil exploitation, which can realize stratified water distribution by being matched with packer to quantitatively inject water into different oil layers under the same well bottom pressure, and control the injection volume of each injection layer by adjusting the size of water distribution nozzle, thereby improving the oil recovery rate. However, when the injection string stops injection, well flushing or testing operation, the liquid in the formation containing sand and impurities flows back into the wellbore and string, which easily blocks the core component, i.e. water nozzle, resulting in the failure to complete water distribution task when injecting water again, and also causing erosion and wear to the precise components (such as spring and valve core) inside the water distributor, affecting its service life and reliability, and also disturbing the formation flow field, making the subsequent testing and logging data inaccurate.

[0003] The Chinese utility model patent with publication number CN205532529U published on August 31, 2016 discloses a piston control type anti-return spit eccentric water distributor, which comprises a water distribution main body, a bias hole for installing a plug and a water injection hole communicating with the bias hole are arranged on the water distribution main body, and a piston and a spring are sleeved outside the water distribution main body to control the opening and closing of the water injection hole. When injecting water, the injected water acts on the piston after passing through the plug nozzle and the water injection hole of the water distribution main body, pushes the piston downward, and compresses the spring. When the pushing force is greater than the upward force of the spring, the piston starts to move downward, opens the water injection passage, and the injected water enters the oil sleeve annulus and is injected into the formation. After pressure relief or well shut-in, there is no pressure in the oil pipe, at this time, the piston is not subjected to downward pushing force, but only subjected to the upward force of the spring, the piston moves upward to reset, the water injection passage is closed, the water distributor is sealed, and the return of the formation spit into the water distributor or the string is prevented.

[0004] The water distributor has anti-return spit function, but after the piston moves upward to reset and the water injection passage is closed, the oil sleeve is not connected, the well fluid fills the oil pipe, the pressure in the oil pipe rises, and the well fluid is brought to the ground with the pipe string when the pipe string is lifted, which forms a jet pipe problem and causes environmental pollution. Another problem is that when the water distributor works in the well for a long time, the injection pressure is high, the piston is always in a downward state to compress the spring, and the spring is compressed and fatigued during the injection operation period. The spring is corroded and scaled by the well fluid, resulting in insufficient elasticity of the spring after the injection string stops injection, the piston cannot move upward to reset, and the anti-return spit function fails. SUMMARY

[0005] The main purpose of the present application is to provide a kind of anti-spitting anti-blowout water distributor, solve the problem that the existing anti-return spit water distributor cannot prevent the jet pipe when lifting the pipe string and the anti-return spit function is easy to fail.

[0006] To achieve the above object, the technical scheme adopted by the present application is: The anti-backflow and anti-blowout water distributor comprises a working cylinder, a main body, a connecting sleeve, a lower joint, characterized in that: the outer part of the main body is sleeved with an upper magnetic ring, a lower magnetic ring, a piston and an upper sealing gasket, the main body is connected with a limiting ring through screw threads, the main body is arranged in the working cylinder, the main body, the working cylinder and the piston form a sealed cavity, the upper magnetic ring and the lower magnetic ring are arranged in the sealed cavity, the main body is welded with a centralizer, the pressure relief rod is arranged in the eccentric hole of the main body, the fixing ring is connected with the main body through screw threads, the lower sealing gasket is arranged in the fixing ring and the backup cap, the working cylinder is connected with the connecting sleeve through screw threads, the connecting sleeve is connected with the lower joint through screw threads, and the guide sleeve is connected with the lower joint through a screw.

[0007] Preferably, the main body, the working cylinder, the piston and the upper sealing gasket are sealed by a sealing element, the working cylinder, the piston and the upper sealing gasket are sealed by a sealing element, the main body and the pressure relief rod and the fixing ring are sealed by a sealing element, the pressure relief rod and the fixing ring are sealed by the lower sealing gasket, and the connecting sleeve and the lower joint are sealed by a sealing element.

[0008] Preferably, the working cylinder and the main body are provided with liquid inlet holes in the middle part, and the connecting sleeve is provided with a liquid inlet hole in the middle part, and the lower part of the main body is provided with a liquid inlet hole, so that when water injection is performed, the liquid is injected into the stratum through the two liquid inlet holes, when the pipe string is pulled out, the well bore liquid pushes the pressure relief rod to go up through the two liquid inlet holes, the oil sleeve is communicated, the well bore liquid in the oil pipe flows back to the well bore, and the problem of the blowout pipe is solved.

[0009] The working principle of the present application is as follows: When water injection is performed, the eccentric hole of the main body is assembled with a plug, the lower end surface of the plug pushes the pressure relief rod to go down, the pressure relief rod and the fixing ring are sealed by the lower sealing gasket, the channel of the liquid inlet hole of the connecting sleeve and the main body is closed, the well bore liquid is injected into the oil pipe, the pressure in the oil pipe is increased, the well bore liquid pushes the piston to go up through the liquid inlet hole of the main body, the liquid inlet hole of the working cylinder is opened, the well bore liquid is injected into the stratum through the liquid inlet hole of the working cylinder, and the water injection is realized; when the water injection pipe string is stopped, well flushing or testing is performed, the pressure of the well bore liquid in the oil pipe is decreased, the pushing force of the piston is decreased, the lower magnetic ring goes down according to the same-pole repulsion principle of the upper magnetic ring and the lower magnetic ring, pushes the piston to go down to the position of the upper sealing gasket, and the liquid inlet hole of the working cylinder is closed, so that the well bore liquid in the stratum cannot enter the water distributor, and the anti-backflow function is realized.

[0010] When the pipe string is pulled out, the plug is first fished out, the well bore liquid in the well bore enters the liquid inlet hole of the connecting sleeve and the main body, and pushes the pressure relief rod to go up according to the pressure of the well bore; when the pressure relief rod goes up to the upper end surface of the eccentric hole of the main body, the pressure relief rod and the fixing ring are not in a sealed state, the oil sleeve is communicated, along with the pulling out of the oil pipe, the well bore liquid in the oil pipe string flows into the well bore, the well bore liquid in the oil pipe string is gradually decreased, and after the pipe string is pulled out to the ground, there is no well bore liquid, so that the environmental pollution is avoided, and the anti-blowout pipe function is realized.

[0011] Compared with the prior art, the present application has the following beneficial effects: The anti-backflow function of the present application adopts the structure that the main body and the working cylinder form a sealed cavity, which is not in contact with the well fluid and does not scale or rust. The upper magnetic ring and the lower magnetic ring are arranged in the sealed cavity, and the magnetic ring same-pole repulsion principle is used to push the piston to close the liquid inlet hole of the working cylinder. This can solve the problem that the conventional anti-backflow water distributor adopts a spring to push the piston to seal, which is easy to scale and corrode, causing the piston to fail to reset and the anti-backflow function to fail. In addition, the stability of the upper magnetic ring, the lower magnetic ring and the piston is ensured, and the service cycle of the water distributor in the well is prolonged. The blowout prevention function adopts a pressure relief rod and a fixed ring sealing structure. During water injection operation, the channel of the connecting sleeve and the main body liquid inlet hole is closed, which can ensure the conventional water injection operation of the water distributor. During pipe column operation, the pressure relief rod is pushed upward by the wellbore pressure, the oil sleeve is connected, the well fluid in the tubing string flows into the wellbore, and there is no well fluid after the pipe column is pulled out of the ground, which will not cause environmental pollution and realize the blowout prevention function. This function solves the problem of blowout of the well fluid under pressure during pipe column operation, which can ensure the safety of the operation and meet the environmental protection requirements.

[0012] In summary, the present application has significant use effects and can produce obvious beneficial effects. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 Figure 1 is a schematic diagram of the overall structure of the anti-backflow and blowout water distributor of the present application during water injection operation; Figure 2 Figure 2 is a schematic diagram of the overall structure of the anti-backflow and blowout water distributor of the present application during pipe column operation; Figure 3 Figure 3 is a schematic diagram of the main body of the anti-backflow and blowout water distributor of the present application; In the figure: 1, working cylinder; 2, centralizer; 3, main body; 4, limiting ring; 5, pressure relief rod; 501, fixed ring; 502, lower sealing gasket; 503, backup cap; 6, connecting sleeve; 7, guide sleeve; 8, lower joint; 9, upper magnetic ring; 10, lower magnetic ring; 11, piston; 12, upper sealing gasket; 13, screw. DETAILED DESCRIPTION

[0014] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in conjunction with specific embodiments.

[0015] For example, Figure 1As shown, an anti-spitting and anti-spraying water distributor includes a working cylinder 1, a main body 3, a connecting sleeve 6, and a lower joint 8. The outer sleeve of the main body 3 is provided with an upper magnetic ring 9, a lower magnetic ring 10, a piston 11, and an upper sealing gasket 12. The main body 3 is connected to the limit ring 4 by a thread. The main body 3 is placed inside the working cylinder 1. The main body 3 and the working cylinder 1 and the piston 11 form a sealed cavity. The upper magnetic ring 9 and the lower magnetic ring 10 are in the sealed cavity. The main body 3 is welded to the centralizing body 2. The pressure relief rod 5 is placed inside the side hole of the main body 3. The fixing ring 501 is connected to the main body 3 by a thread. The lower sealing gasket 502 is placed inside the fixing ring 501 and the spare cap 503. The working cylinder 1 is connected to the connecting sleeve 6 by a thread. The connecting sleeve 6 is connected to the lower joint 8 by a thread. The guide sleeve 7 It is connected to the lower joint 8 by screws 13, the main body 3 and the working cylinder 1, the piston 11, and the upper sealing gasket 12 are sealed by seals, the working cylinder 1 and the piston 11 and the upper sealing gasket 12 are sealed by seals, the main body 3 and the pressure relief rod 5 and the fixing ring 501 are sealed by seals, the pressure relief rod 5 and the fixing ring 501 are sealed by the lower sealing gasket 502, the connecting sleeve 6 and the lower joint 8 are sealed by seals, the working cylinder 1 and the main body 3 are provided with liquid inlet holes in the middle, and water is injected into the formation through the two liquid inlet holes during water injection operations, the connecting sleeve 6 is provided with a liquid inlet hole in the middle, and the main body 3 is provided with a liquid inlet hole at the bottom. When the tubing is lifted, the well fluid in the wellbore pushes the pressure relief rod 5 upward through the two liquid inlet holes, the oil casing is connected, and the well fluid in the oil pipe flows back to the wellbore, solving the nozzle problem.

[0016] During water injection operation, a plug will be installed in the side hole of the main body 3, and the lower end face of the plug will push the pressure relief rod 5 downward. The pressure relief rod 5 and the fixing ring 501 are sealed by the lower sealing gasket 502, closing the channel between the connecting sleeve 6 and the liquid inlet hole of the main body 3, and injecting well fluid into the oil pipe. The pressure in the oil pipe increases, and the well fluid pushes the piston 11 upward through the liquid inlet hole of the main body 3. The liquid inlet hole of the working cylinder 1 is opened, and the well fluid is injected into the formation through the liquid inlet hole of the working cylinder 1 to realize water injection operation. When the water injection string stops injection, well washing or testing operation, the well fluid pressure in the oil pipe drops, and the thrust of the piston 11 decreases. Utilizing the principle of like-pole repulsion between the upper magnetic ring 9 and the lower magnetic ring 10, the lower magnetic ring 10 moves downward, pushing the piston 11 downward to the end face of the upper sealing gasket 12, closing the liquid inlet hole of the working cylinder 1, and the formation well fluid will not enter the water distributor, realizing the anti-backflow function.

[0017] When the tubing is pulled out, the plug is first fished out, and the well fluid in the wellbore enters the connecting sleeve 6 and the liquid inlet hole of the main body 3, and the pressure relief rod 5 is pushed upward by the wellbore pressure. When the pressure relief rod 5 moves up to the upper end face of the side hole of the main body 3, the pressure relief rod 5 and the fixing ring 501 are no longer in a sealed state, and the oil casing is connected. As the oil pipe is pulled out, the well fluid in the oil tubing string flows into the wellbore, and the well fluid in the oil tubing string will gradually decrease. After the tubing is pulled out of the ground, there is no well fluid, and no environmental pollution is caused, thus realizing the function of the blowout preventer.

[0018] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. Those skilled in the art should understand that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. An anti-spitting and anti-spraying water distributor, comprising a working cylinder (1), a main body (3), a connecting sleeve (6), and a lower joint (8), characterized in that: The main body (3) is externally sleeved with an upper magnetic ring (9), a lower magnetic ring (10), a piston (11), and an upper sealing gasket (12); the main body (3) is connected to the limiting ring (4) by threads; the main body (3) is placed inside the working cylinder (1); the main body (3), the working cylinder (1), and the piston (11) form a sealed cavity; the upper magnetic ring (9) and the lower magnetic ring (10) are in the sealed cavity; the main body (3) is welded to the straightening body (2); the pressure relief rod (5) is placed inside the side hole of the main body (3); the fixing ring (501) is connected to the main body (3) by threads; the lower sealing gasket (502) is placed inside the fixing ring (501) and the spare cap (503); the working cylinder (1) is connected to the connecting sleeve (6) by threads; the connecting sleeve (6) is connected to the lower joint (8) by threads; and the guide sleeve (7) is connected to the lower joint (8) by screws (13).

2. The anti-spitting and anti-spraying water distributor according to claim 1, characterized in that: The main body (3) is sealed with the working cylinder (1), the piston (11), and the upper sealing gasket (12) by a sealing member; the working cylinder (1) is sealed with the piston (11), and the upper sealing gasket (12) by a sealing member; the main body (3) is sealed with the pressure relief rod (5) and the fixing ring (501) by a sealing member; the pressure relief rod (5) and the fixing ring (501) are sealed by a lower sealing gasket (502); and the connecting sleeve (6) and the lower joint (8) are sealed by a sealing member.

3. The anti-spitting and anti-spraying water distributor according to claim 1, characterized in that: The working cylinder (1) and the main body (3) are provided with liquid inlet holes in the middle, and water is injected into the formation through the two liquid inlet holes during water injection operation. The connecting sleeve (6) is provided with a liquid inlet hole in the middle, and the main body (3) is provided with a liquid inlet hole at the bottom. When the pipe string is lifted, the wellbore fluid pushes the pressure relief rod (5) upward through the two liquid inlet holes, the oil casing is connected, and the wellbore fluid in the oil pipe flows back into the wellbore, thereby solving the nozzle problem.

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