Concentric water distributor for oilfield water injection

Abstract

The utility model provides a concentric water distributor for oilfield water injection, which solves the problems that the traditional eccentric water distributor adopts an eccentric water nozzle structure, the fit clearance between a movable water nozzle and a fixed water nozzle is easily abraded by sand grains, the flow regulation precision is low, the formation pressure is higher than the shaft pressure when injection is stopped, fluid containing silt easily reversely permeates into the water distributor, and the water injection efficiency is low. And a water nozzle or a driving mechanism is blocked. The strip-hole-shaped water outlet hole extending in the vertical direction is formed in the second pipeline and the shell, the opening degree of the water outlet hole is adjusted through the plugging barrel capable of moving vertically, the size of the water outlet hole can be flexibly adjusted according to actual requirements, the precision and efficiency of water injection flow adjustment are improved, the opening degree of the water outlet hole is adjusted through the plugging barrel, and the water injection efficiency is improved. The influence of sand abrasion can be reduced, and accurate flow adjustment is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to oilfield exploitation technical field especially is a kind of concentric water distributor for oilfield injection. BACKGROUND

[0002] In the development process of oilfield injection, layered injection technology is one of the key means to improve oil recovery. As the core downhole tool of layered injection system, concentric water distributor realizes quantitative injection of different oil layers by adjusting the opening degree of water nozzle, thereby balancing the injection profile and relieving interlayer contradictions.

[0003] However, the traditional eccentric water distributor adopts eccentric nozzle structure, and the cooperation gap between the movable nozzle and the fixed nozzle is easily worn by sand particles, resulting in low flow regulation accuracy. When injection is stopped, the formation pressure is higher than the wellbore pressure, and the sand-containing fluid is easily reverse-seeped into the water distributor, blocking the nozzle or driving mechanism. UTILITY MODEL CONTENTS

[0004] To solve the problem of the traditional eccentric water distributor in the background art, the utility model provides a concentric water distributor for oilfield injection.

[0005] The technical scheme of the utility model is: a concentric water distributor for oilfield injection, comprising a plurality of housings, the housings are arranged in an upper and lower interval, the top end of the housing is fixedly connected with a female buckle, the housing is connected with the male buckle end of the upper oil pipe through the female buckle, the bottom end of the housing is fixedly connected with a male buckle, and the housing is connected with the female buckle end of the lower oil pipe through the male buckle.

[0006] A ceramic sleeve coaxial with the housing is fixedly embedded in the housing, the ceramic sleeve comprises a first pipeline and a second pipeline in communication with each other, the first pipeline is located above the second pipeline, and the inner diameter of the first pipeline is smaller than that of the second pipeline, and the second pipeline is symmetrically provided with two water outlet holes in the side wall of the housing, which are arranged in an inside-out penetrating manner; a regulating sleeve capable of sliding up and down is coaxially arranged in the first pipeline, the bottom of the regulating sleeve penetrates into the second pipeline and is coaxially provided with a plugging cylinder, the plugging cylinder is sealingly slid in the second pipeline, and the plugging cylinder can adjust the opening degree of the water outlet hole when sliding up and down.

[0007] Preferably, an internal thread groove is formed in the inner side wall of the top end of the second pipeline, an external thread sleeve is fixedly sleeved on the regulating sleeve, and the external thread sleeve is threadedly arranged on the inner wall of the second pipeline through the internal thread groove.

[0008] Preferably, the housing is provided with a drive mechanism, which is used to drive the adjusting sleeve to rotate, so as to drive the sealing cylinder to move up and down through the internal thread groove and the external thread sleeve. The drive mechanism includes a lifting rod passing through the housing and the oil pipe axis, and the top of the lifting rod passes through the ground and is connected to the lifting system on the ground derrick.

[0009] The bottom end of the lifting rod is equipped with a drive motor, and the output shaft of the drive motor is fixedly equipped with a connector. The connector is symmetrically equipped with two locking blocks that can extend and retract inwards.

[0010] The top of the adjusting sleeve has multiple through slots that are open inside and out and extend in the vertical direction. The multiple through slots are spaced apart along the circumferential direction of the adjusting sleeve. The locking block can be inserted into the through slot when it is extended, and the locking block slides up and down in the through slot. When the locking block is extended and inserted into the through slot, the drive motor drives the connector to rotate. The torque is transmitted through the rigid engagement between the locking block and the through slot, which drives the adjusting sleeve and the external threaded sleeve to rotate.

[0011] Preferably, the outer diameter of the lifting rod and the connector is smaller than the inner diameter of the adjusting sleeve and the sealing cylinder.

[0012] Preferably, the bottom end of the adjusting sleeve is rotatably connected to the top end of the sealing cylinder. Two positioning rings are fixedly provided on the outer circumferential surface of the bottom end of the adjusting sleeve, and a fixing ring is fixedly provided on the inner side wall of the top end of the sealing cylinder. The fixing ring is rotatably sleeved on the bottom end of the adjusting sleeve and is located between the two positioning rings.

[0013] The inner wall of the bottom end of the second pipe is provided with multiple protrusions along its extension direction. The multiple protrusions are evenly distributed along the circumferential direction of the second pipe, and the sealing cylinder is provided with multiple sliding grooves that are adapted to the protrusions.

[0014] Advantages of this utility model: (1) This utility model sets a strip-shaped water outlet hole extending in the vertical direction on the second pipe and the shell, and uses a plugging cylinder that can move up and down to adjust the opening of the water outlet hole. The size of the water outlet hole can be flexibly adjusted according to actual needs, which improves the accuracy and efficiency of water injection flow regulation. Using the plugging cylinder to adjust the opening of the water outlet hole can reduce the impact of sand wear and ensure accurate flow regulation. When the injection stops, since the plugging cylinder seals the water outlet hole, the muddy fluid is not easy to seep back into the water distributor, avoiding the blockage of the water nozzle or drive mechanism, and improving the stability and reliability of the equipment.

[0015] (2) In this utility model, the internal thread groove and the external thread sleeve form a helical pair, which converts the linear thrust into rotational torque, thereby reducing the load applied when driving the adjusting sleeve and the sealing cylinder to move up and down, so as to facilitate driving under such harsh conditions deep underground.

[0016] (3) In this utility model, by setting a positioning ring on the adjusting sleeve and a fixing ring on the sealing cylinder, the sealing cylinder can be prevented from rotating with the adjusting sleeve. By setting multiple protrusions on the inner side wall of the second pipe and opening a sliding groove on the sealing cylinder that matches the protrusions, the protrusions and the sliding groove can guide the sealing cylinder to slide horizontally up and down, changing the original rotation into horizontal sliding. This can reduce the friction between the sealing cylinder and the ceramic sleeve and prevent the sealing performance from decreasing due to long-term use of the sealing cylinder and the ceramic sleeve, thus preventing water leakage. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This utility model Figure 1 Overall structural front section view;

[0020] Figure 3 This utility model Figure 1 Schematic diagram of the structure of the adjusting sleeve;

[0021] Figure 4 This utility model Figure 1 A schematic diagram of the structure of the central sealing cylinder.

[0022] In the diagram: 1. Shell; 11. Female thread; 12. Male thread; 2. Ceramic sleeve; 21. First pipe; 22. Second pipe; 3. Water outlet; 4. Adjusting sleeve; 41. Positioning ring; 5. Sealing sleeve; 51. Fixing ring; 6. Internal thread groove; 7. External thread sleeve; 81. Lifting rod; 82. Connector; 83. Locking block; 84. Through groove; 9. Raised strip; 10. Sliding groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1: A concentric water distributor for oilfield water injection, such as...Figures 1-4 As shown, the device includes multiple housings 1, each housing 1 being a cylindrical hollow pipe structure extending vertically. The multiple housings 1 are spaced vertically and connected in series with oil pipes. The multiple housings 1 and the interior of the oil pipes form a water injection channel. The top of the water injection channel is connected to a water injection pump. Specifically, a female thread 11 is fixedly connected to the top of the housing 1 for connecting with the male thread end of the upper oil pipe, and a male thread 12 is fixedly connected to the bottom of the housing 1 for connecting with the female thread end of the lower oil pipe, ensuring the continuity of the water injection channel.

[0025] A ceramic sleeve 2 is fixedly embedded within the housing 1 and is coaxially arranged therewith. The inner cavity of the ceramic sleeve 2 is a stepped composite flow channel. The ceramic sleeve 2 includes a first pipe 21 and a second pipe 22 that are interconnected. The first pipe 21 is located above the second pipe 22, and the inner diameter of the first pipe 21 is smaller than that of the second pipe 22. The second pipe 22 and the side wall of the housing 1 have two water outlet holes 3 that are symmetrically arranged and are open to both the inside and outside. The water outlet holes 3 are strip-shaped holes that extend in the vertical direction. An adjusting sleeve 4 that can slide up and down is coaxially arranged inside the first pipe 21. The bottom of the adjusting sleeve 4 passes through the second pipe 2. 2. A sealing cylinder 5 is coaxially provided. The sealing cylinder 5 slides up and down to seal inside the second pipe 22. The sealing cylinder 5 can adjust the opening of the water outlet 3 when sliding up and down, and can flexibly adjust the size of the water outlet according to actual needs, which improves the accuracy and efficiency of water injection flow regulation. Using the sealing cylinder 5 to adjust the opening of the water outlet 3 can reduce the impact of sand abrasion and ensure accurate flow regulation. When the injection stops, because the sealing cylinder 5 seals the water outlet 3, the muddy fluid is not easy to seep back into the water distributor, avoiding the blockage of the water nozzle or drive mechanism, and improving the stability and reliability of the equipment.

[0026] The inner wall of the top end of the second pipe 22 is provided with an internal threaded groove 6. An external threaded sleeve 7 is fixedly sleeved on the adjusting sleeve 4. The external threaded sleeve 7 is threaded onto the inner wall of the second pipe 22 through the internal threaded groove 6. The internal threaded groove 6 and the external threaded sleeve 7 form a helical pair, which converts the linear thrust into rotational torque. This can reduce the load applied when driving the adjusting sleeve 4 and the sealing cylinder 5 to move up and down, so as to facilitate driving under such harsh conditions deep underground.

[0027] The housing 1 contains a drive mechanism to drive the adjusting sleeve 4 to rotate, thereby moving the sealing sleeve 5 up and down through the internal threaded groove 6 and the external threaded sleeve 7, changing the size of the water outlet 3 or completely closing the water outlet 3. Specifically, the drive mechanism includes a lifting rod 81 passing through the housing 1 and the oil pipe axis. The lifting rod 81 consists of multiple stainless steel pipes connected vertically in series. The top of the lifting rod 81 extends out of the ground and connects to the hoisting system on the ground derrick. The hoisting system consists of a winch, a hoisting cable, and a crane, which can move the lifting rod 81 up and down to control the water distributors at different depths. For those skilled in the art, the hoisting system is well-known technology and will not be described in detail. The bottom of the lifting rod 81 is equipped with a drive motor (not shown in the figure). The lifting rod 81 contains a cable electrically connected to the drive motor for remote control of the drive motor. The output shaft of the drive motor is fixedly equipped with a connector 82, on which are symmetrically arranged... There are two extendable and retractable locking blocks 83. Specifically, a spring (not shown in the figure) is provided inside the connector 82. The spring is located between the tail of the locking block 83 and the inner cavity of the connector 82. Under normal conditions, it is in a compressed state. When the locking block 83 has no resistance, the spring pushes the locking block 83 to extend outward. When the locking block 83 encounters resistance, the locking block 83 further compresses the spring and retracts into the connector 82. The top of the adjusting sleeve 4 has multiple through slots 84 that are open inside and out and extend in the vertical direction. The multiple through slots 84 are arranged at intervals along the circumferential direction of the adjusting sleeve 4. The locking block 83 can be inserted into the through slot 84 when it is extended, and the locking block 83 slides up and down in the through slot 84. When the locking block 83 extends and is inserted into the through slot 84, the drive motor drives the connector 82 to rotate. The torque is transmitted through the rigid engagement between the locking block 83 and the through slot 84, which drives the adjusting sleeve 4 and the external threaded sleeve 7 to rotate, so that the sealing cylinder 5 moves up and down along the inner wall of the second pipe 22, and precisely adjusts the opening of the water outlet 3.

[0028] The outer diameter of the lifting rod 81 and the connector 82 is smaller than the inner diameter of the adjusting sleeve 4 and the sealing sleeve 5, which allows the lifting rod 81 and the connector 82 to move up and down within the housings of multiple tubing and concentric water distributors, thereby controlling the concentric water distributors at different depths within the formation. This significantly improves the applicability of the concentric water distributor in deep wells, horizontal wells, and corrosive well conditions, and enables precise and efficient control of water injection into multiple oil layers.

[0029] The bottom end of the adjusting sleeve 4 is rotatably connected to the top end of the sealing cylinder 5. Specifically, two positioning rings 41 are fixedly provided on the outer circumferential surface of the bottom end of the adjusting sleeve 4, and a fixing ring 51 is fixedly provided on the inner side wall of the top end of the sealing cylinder 5. The fixing ring 51 is rotatably sleeved on the bottom end of the adjusting sleeve 4 and is located between the two positioning rings 41, so that the sealing cylinder 5 can not rotate with the adjusting sleeve 4. The inner side wall of the bottom end of the second pipe 22 is provided with multiple protrusions 9 arranged along its extension direction. The multiple protrusions 9 are evenly distributed along the circumferential direction of the second pipe 22. The sealing cylinder 5 is provided with multiple sliding grooves 10 that are adapted to the protrusions 9. The protrusions 9 and the sliding grooves 10 can guide the sealing cylinder 5 to slide horizontally up and down, changing the original rotation into horizontal sliding. This can reduce the friction between the sealing cylinder 5 and the ceramic sleeve 2 and prevent the sealing performance from decreasing due to long-term use of the sealing cylinder 5 and the ceramic sleeve 2, thus preventing water leakage.

[0030] Working principle: During the water injection process, the ground water pump pressurizes the water, which flows through the oil pipe into the housing 1, and then through the first pipe 21 and the second pipe 22 in sequence, injecting the water into the target oil layer from the outlet hole 3. When flow adjustment is required, the lifting system moves the connector 82 at the bottom of the lifting rod 81 to the concentric water distribution housing at the specified depth, so that the locking block 83 on the connector 82 extends and inserts into the through groove 84 of the adjusting sleeve 4. Then, the ground sends a command, and the drive motor drives the connector 82 to rotate through the lifting rod 81. The torque is transmitted through the rigid engagement of the locking block 83 and the through groove 84, which drives the adjusting sleeve 4 and the external threaded sleeve 7 to rotate, so that the sealing cylinder 5 moves up and down along the inner wall of the second pipe 22 to precisely adjust the opening of the outlet hole 3. When it is necessary to close the outlet hole 3, the drive motor is controlled to move the sealing cylinder 5 down to completely cover the outlet hole 3, thus closing the outlet hole 3.

[0031] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims and not by the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A concentric water distributor for oilfield water injection, characterized in that: It includes multiple housings (1), with multiple housings (1) arranged vertically at intervals. The top of each housing (1) is fixedly connected to a female buckle (11), and the housing (1) is connected to the male end of the upper oil pipe through the female buckle (11). The bottom of each housing (1) is fixedly connected to a male buckle (12), and the housing (1) is connected to the female end of the lower oil pipe through the male buckle (12). A ceramic sleeve (2) is fixedly embedded in the housing (1) and is coaxially arranged therewith. The ceramic sleeve (2) includes a first pipe (21) and a second pipe (22) that are interconnected. The first pipe (21) is located above the second pipe (22), and the inner diameter of the first pipe (21) is smaller than that of the second pipe (22). The second pipe (22) and the side wall of the housing (1) are symmetrically provided with two water outlet holes (3) that are open to the inside and outside. An adjusting sleeve (4) that can slide up and down is coaxially arranged in the first pipe (21). The bottom of the adjusting sleeve (4) is inserted into the second pipe (22) and a sealing cylinder (5) is coaxially arranged. The sealing cylinder (5) slides up and down to seal in the second pipe (22). The sealing cylinder (5) can adjust the opening of the water outlet hole (3) when it slides up and down.

2. The concentric water distributor for oilfield water injection according to claim 1, characterized in that: The inner wall of the top end of the second pipe (22) is provided with an internal thread groove (6), and an external thread sleeve (7) is fixedly fitted on the adjusting sleeve (4). The external thread sleeve (7) is threaded onto the inner wall of the second pipe (22) through the internal thread groove (6).

3. A concentric water distributor for oilfield water injection according to claim 2, characterized in that: The housing (1) is equipped with a drive mechanism, which is used to drive the adjusting sleeve (4) to rotate, so as to drive the sealing cylinder (5) to move up and down through the internal thread groove (6) and the external thread sleeve (7). The drive mechanism includes a lifting rod (81) that passes through the housing (1) and the oil pipe axis. The top of the lifting rod (81) passes through the ground and is connected to the lifting system on the ground derrick. The bottom end of the lifting rod (81) is equipped with a drive motor, and the output shaft of the drive motor is fixedly equipped with a connector (82). Two locking blocks (83) that can extend and retract inward and outward are symmetrically provided on the connector (82). The top of the adjusting sleeve (4) is provided with multiple through slots (84) that are open inside and out and extend in the vertical direction. The multiple through slots (84) are arranged at intervals along the circumferential direction of the adjusting sleeve (4). The locking block (83) can be inserted into the through slot (84) when it is extended, and the locking block (83) slides up and down in the through slot (84). When the locking block (83) extends and is inserted into the through slot (84), the drive motor drives the connector (82) to rotate. Through the rigid engagement between the locking block (83) and the through slot (84), the torque is transmitted, which drives the adjusting sleeve (4) and the external threaded sleeve (7) to rotate.

4. A concentric water distributor for oilfield water injection according to claim 3, characterized in that: The outer diameter of the lifting rod (81) and the connector (82) is smaller than the inner diameter of the adjusting sleeve (4) and the sealing sleeve (5).

5. A concentric water distributor for oilfield water injection according to claim 3, characterized in that: The bottom end of the adjusting sleeve (4) is rotatably connected to the top end of the sealing cylinder (5). Two positioning rings (41) are fixedly provided on the outer circumferential surface of the bottom end of the adjusting sleeve (4) and spaced apart vertically. A fixing ring (51) is fixedly provided on the inner side wall of the top end of the sealing cylinder (5). The fixing ring (51) is rotatably sleeved on the bottom end of the adjusting sleeve (4) and is located between the two positioning rings (41). The inner wall of the bottom end of the second pipe (22) is provided with a number of protrusions (9) arranged along its extension direction. The protrusions (9) are evenly arranged along the circumferential direction of the second pipe (22). The sealing cylinder (5) is provided with a number of sliding grooves (10) that are compatible with the protrusions (9).

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