A bridge type concentric constant flow water distributor

Abstract

The present invention discloses a bridge-type concentric constant-flow water distributor, comprising an upper joint, a connecting sleeve and a lower joint connected in sequence, a concentric movable cylinder connected by a positioning platform is provided in the connecting sleeve, the concentric movable cylinder is supported in the lower joint, and the outer part of the concentric movable cylinder is sleeved in the water distributor body; the water distributor body is provided with a water distributor bridge channel consisting of a fixed water nozzle and a water outlet connected with the connecting sleeve and the concentric movable cylinder, a flow stabilizing regulating piece is provided in the fixed water nozzle, and a flow stabilizing spring is installed at the lower end of the flow stabilizing regulating piece; the flow stabilizing spring is automatically adjusted under the impact of water flow pressure to change the opening between the flow stabilizing regulating piece and the fixed water nozzle, so as to control the fluctuation of the stratified water injection flow. The device adopts a flow stabilizing regulating piece design, and when the wellbore pressure fluctuates slightly, the flow stabilizing regulating piece is automatically adjusted, and the stratified flow is slightly adjusted on the basis of the adjustment of the fixed water nozzle, so as to improve the qualified rate of stratified water injection.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield water injection, and in particular relates to a bridge-type concentric constant-current water distributor. Background Art

[0002] In order to solve the problems of the eccentric structure adopted in the previous bridge-type eccentric injection technology, the low success rate of eccentric casting and fishing, the universal shaft adjustment of the water nozzle, the low power transmission efficiency, and the low success rate of measurement and adjustment, the existing technology adopts the injection technology using concentric docking and concentric adjustment, and the water flows into the formation through a throttling, reducing the dirt deposition caused by the water nozzle bypass, which leads to the measurement and adjustment encounter, greatly improving the docking success rate, high measurement and adjustment accuracy, high measurement and adjustment efficiency, with multiple injection levels, adapting to the injection requirements of large well deviation, produced water, and small water volume, which greatly meets the needs of fine injection in oil fields. However, since the injection technology still needs to use downhole mechanical docking, it needs to be equipped with a measurement and adjustment team and instruments for regular testing and adjustment. Affected by factors such as pressure fluctuations in the ground water injection system and changes in the water absorption capacity of the formation, the throttling effect of the water nozzle changes, resulting in a rapid decrease in the injection qualification rate of the injection well, which seriously restricts the effect of stratified water injection development in the reservoir. Summary of the invention

[0003] The purpose of the present invention is to provide a bridge-type concentric constant-flow water distributor, which utilizes the stratified flow constant-flow control technology of the downhole water distributor and adopts a flow-stabilizing regulating plate design. When the wellbore pressure fluctuates slightly, the flow-stabilizing regulating plate is automatically adjusted. On the basis of the fixed water nozzle adjustment, the stratified flow is slightly adjusted to improve the qualified rate of stratified water injection.

[0004] The present invention is achieved through the following technical solutions.

[0005] The present invention provides a bridge-type concentric constant-flow water distributor, comprising an upper joint, a connecting sleeve and a lower joint which are connected in sequence, wherein a concentric movable cylinder connected by a positioning platform is arranged in the connecting sleeve, the concentric movable cylinder is supported in the lower joint, and the outer portion of the concentric movable cylinder is sleeved in a water distributor body; the water distributor body is provided with a water distributor bridge channel which is composed of a fixed water nozzle and a water outlet which are connected with the connecting sleeve and the concentric movable cylinder, a flow stabilizing regulating plate is arranged in the fixed water nozzle, and a flow stabilizing spring is installed at the lower end of the flow stabilizing regulating plate; the flow stabilizing spring is automatically adjusted under the impact of water flow pressure to change the opening between the flow stabilizing regulating plate and the fixed water nozzle, so as to realize the control of the fluctuation of the stratified water injection flow.

[0006] Preferably, the tail portion of the concentric movable cylinder is supported in the lower joint via a support seat.

[0007] Preferably, the support seat is provided with a bridge-type flow hole which is connected to the bridge-type channel of the water distributor.

[0008] Preferably, a positioning anti-reversal groove is provided above the positioning platform for positioning and docking with the measuring and adjusting instrument. The middle section inside the positioning platform is the straightening section, and the concentric movable cylinder is mounted inside it. A sewage flow hole, an adjusting thread, a knife withdrawal groove and a sealing rubber ring are designed in the middle of the positioning platform, and the adjusting thread is docked with the adjusting thread on the concentric movable cylinder.

[0009] Preferably, the fixed water spout comprises a water outlet arranged on the water distributor body, and a fixed water spout front sleeve and a fixed water spout rear sleeve are respectively arranged inside and outside the side walls of the water distributor body corresponding to the upper and lower parts of the water outlet, and a flow stabilizing adjustment plate is arranged between the fixed water spout front sleeve and the fixed water spout rear sleeve; a flow stabilizing spring is fixedly installed on the water distributor body connected to the support seat below the flow stabilizing adjustment plate.

[0010] Preferably, the flow stabilizing regulating plate is provided with a water outlet, the length of which is half the length of the elliptical water outlet of the fixed water nozzle rear sleeve, and the fixed water nozzle front sleeve, the fixed water nozzle rear sleeve and the flow stabilizing regulating plate are aligned at the upper end of the water outlet.

[0011] Preferably, the middle portion of the flow-stabilizing regulating plate is made of ceramic material; the front sleeve of the fixed faucet and the rear sleeve of the fixed faucet are respectively elliptical water outlets, and the two water outlets are completely aligned.

[0012] Preferably, sealing rubber rings are provided on the fixed faucet front sleeve, the upper and lower parts of the fixed faucet rear sleeve and the flow stabilizing regulating plate; retaining rings are provided on the sealing rubber rings at the upper and lower ends of the flow stabilizing regulating plate.

[0013] Preferably, the water outlet on the water distributor body is a crescent-shaped hole on the outside of the water distributor body, and the water distributor body is coaxially arranged with the positioning platform.

[0014] Preferably, the concentric movable cylinder is provided with four adjustment grooves, and the upper and lower ends of the adjustment grooves are respectively provided with positive and reverse release grooves.

[0015] The present invention adopts the above technical solution, which has the following beneficial effects:

[0016] (1) The water distributor is concentrically connected to the adjustment structure to enable it to be used in conjunction with the original downhole test and adjustment instrument.

[0017] (2) The fixed water nozzle of the water distributor is designed with a stratified flow constant flow control structure, which overcomes the problem that the early water distribution needs to be intensified for manual testing and adjustment, solves the problem of stratified flow fluctuations caused by small pressure fluctuations, and reduces the qualified rate of stratified water injection.

[0018] (3) The combination of downhole flow regulation and pressure stabilization control is adopted to improve the flow control effect and achieve constant control of stratified flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of the present application, and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of a bridge-type concentric constant-current water distributor;

[0021] Figure 2 This is a partial enlarged schematic diagram of the water nozzle of the bridge-type concentric constant-flow water distributor;

[0022] Figure 3 This is a schematic diagram of the main structure of a bridge-type concentric constant-flow water distributor;

[0023] Figure 4 It is a schematic diagram of the water outlet structure in the main body of the water distributor;

[0024] Figure 5 It is a schematic diagram of the concentric movable cylinder structure.

[0025] Reference numerals: 1, upper joint; 2, positioning platform; 2-1, positioning anti-reversal groove; 2-2, straightening section; 2-3, sewage discharge hole; 2-4, sealing rubber ring; 2-5, knife back groove; 2-6, adjustment thread; 2-7, support seat sealing rubber ring; 2-8, support seat pin groove; 3-connecting sleeve; 4-concentric movable cylinder; 4-1, reverse release groove; 4-2, forward release groove; 4-3, fluororubber ring; 4-4, adjustment groove; 4-5 , adjusting thread; 4-6, ceramic water nozzle; 4-7, bonding thread; 5, water distributor body; 5-1, first sealing rubber ring; 5-2, second sealing rubber ring; 5-3, metal guide ring; 5-4, ceramic water outlet; 5-5, third sealing rubber ring; 5-6, fourth sealing rubber ring; 6, fixed water nozzle front sleeve; 7, water outlet; 8, fixed water nozzle rear sleeve; 9, flow stabilizing adjustment plate; 10, flow stabilizing spring; 11, support seat; 12, lower joint. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0027] like Figure 1 , Figure 2 As shown, the present invention provides a bridge type concentric constant flow water distributor, comprising an upper joint 1, a positioning platform 2, a connecting sleeve 3, a concentric movable cylinder 4, a water distributor body 5, a fixed water nozzle front sleeve 6, a water outlet 7, a fixed water nozzle rear sleeve 8, a flow stabilizing adjustment sheet 9, a flow stabilizing spring 10, a support seat 11 and a lower joint 12.

[0028] Among them, the connecting sleeve 3 is sleeved on the lower end of the upper joint 1, and the connecting sleeve 3 is threadedly connected to the lower end of the upper joint 1; the water distributor body 5 is sleeved between the connecting sleeve 3 and the lower joint 12, and the water distributor body 5 is threadedly connected to the lower end of the connecting sleeve 3 and the upper end of the lower joint 12, and the support seat 11 is installed in the water distributor body 5 above the lower joint 12, and the support seat 11 is fixed in the water distributor body 5 by pins. The connecting sleeve 3 is provided with a concentric movable cylinder 4 connected by a positioning platform 2, and the positioning platform 2 is plugged into the upper end of the water distributor body 5 and fixed by welding. The concentric movable cylinder 4 is sleeved in the water distributor body 5 and the positioning platform 2, and the water distributor body 5 is threadedly connected to the concentric movable cylinder 4.

[0029] like Figure 3 As shown, the positioning platform 2 is used to position and dock with the measuring and adjusting instrument to complete the test and adjustment process. Four positioning anti-reversal grooves 2-1 are designed to complete the relative rotation of the measuring and adjusting instrument and the positioning platform 2. The positioning platform 2 is provided with a positioning anti-reversal groove 2-1 for positioning and docking with the measuring and adjusting instrument above. The middle section inside the positioning platform 2 is a straightening section 2-2, which is used to fit the concentric movable cylinder 4 inside it, straighten the concentric movable cylinder 4, ensure that the concentric movable cylinder 4 is concentric with the measuring and adjusting instrument, and reduce the measuring and adjusting torque. A sewage flow hole 2-3 is designed in the middle of the positioning platform 2, which is used to discharge impurities inside the positioning platform 2 and for water to enter the bridge channel during measurement and adjustment, thereby reducing the impact on water injection in other layers. An adjusting thread 2-6, a tool withdrawal groove 2-5 and a sealing rubber ring 2-4 are also provided in the middle of the positioning platform 2. The adjusting thread 2-6 is connected with the adjusting thread on the concentric movable cylinder 4 to complete the adjustment of the water nozzle; the sealing rubber ring is used to seal between the positioning platform 2 and the concentric movable cylinder 4 to ensure that there are no impurities in the adjusting thread and protect the thread oil on the adjusting thread; the tool withdrawal groove is used for processing tool withdrawal.

[0030] The water distributor body 5 is provided with a fixed water nozzle and a water outlet 7, wherein the fixed water nozzle comprises a fixed water nozzle front sleeve 6 and a fixed water nozzle rear sleeve 8. Figure 2As shown, a flow-stabilizing regulating piece 9 is provided between the fixed faucet front sleeve 6 and the fixed faucet rear sleeve 8, and a flow-stabilizing spring 10 is provided at the lower end of the flow-stabilizing regulating piece 9. The upper end of the flow-stabilizing spring 10 is connected to the flow-stabilizing regulating piece 9 to realize automatic adjustment of the regulating piece and change the opening of the faucet. The fixed faucet front sleeve 6 is designed in the innermost layer, and the water distributor body is made of ceramic material. Sealing rubber rings are designed at the upper and lower ends of the fixed faucet front sleeve 6 respectively, so as to achieve effective sealing with the concentric movable cylinder 4; a retaining ring is designed on the upper sealing rubber ring. The water distributor body is compressed on the support seat 11 through the inclined surface to ensure the fixation of the fixed faucet front sleeve 6. The middle part of the flow-stabilizing regulating piece 9 is designed with ceramic material, and sealing rubber rings are designed at the upper and lower ends at the same time to ensure that the flow-stabilizing regulating piece 9 is relatively sealed with the fixed faucet front sleeve 6 and the fixed faucet rear sleeve 8. At the same time, metal retaining rings are designed on the outside of the rubber rings. The upper retaining ring is used to fix and limit the position of the positioning platform 2, and the lower metal retaining ring is in contact with the flow-stabilizing spring 10 to prevent the spring from damaging the sealing rubber ring. The fixed faucet rear sleeve 8 is made of ceramic material, and a sealing rubber ring is designed at the upper end to achieve effective sealing with the water distributor body 5. The lower end is supported on the variable diameter platform at the lower end of the water distributor body to achieve the fixed faucet rear sleeve 8 without relative movement; the fixed faucet front sleeve 6 and the fixed faucet rear sleeve 8 are respectively designed with elliptical water outlets, and the two water outlets are completely aligned. The water outlet 7 on the water distributor body 5 completes the water flow into the formation; the water outlet 7 is designed with a metal guide ring and a ceramic water outlet. The metal guide ring reduces the resistance to the water outlet and improves the passability. The ceramic water outlet has good hardness and corrosion resistance, and has a good long-term application effect.

[0031] The flow-stabilizing spring 10 is fixedly installed between the water distributor body 5 and the support seat 11, and the upper end is connected to the flow-stabilizing regulating piece 9 to ensure the sealing of the flow-stabilizing spring 10. The fixed faucet front sleeve 6, the fixed faucet rear sleeve 8, the flow-stabilizing regulating piece 9 and the flow-stabilizing spring 10 constitute a flow-stabilizing control structure. Under the impact of water flow pressure, the flow-stabilizing regulating piece 9 automatically adjusts the flow-stabilizing spring 10 to change the opening between the flow-stabilizing regulating piece 9 and the fixed faucet front sleeve and rear sleeve. When the flow-stabilizing regulating piece 9 is assembled, the flow-stabilizing spring 10 is compressed to generate prestress. At the same time, a water outlet is designed on the flow-stabilizing regulating piece 9, and its length is half the length of the elliptical water outlet of the fixed faucet rear sleeve 8. The upper ends of the water outlets of the fixed faucet front sleeve 6, the fixed faucet rear sleeve 8 and the flow-stabilizing regulating piece 9 are aligned.

[0032] The support seat is designed with a support seat sealing rubber ring 2-7 to achieve effective sealing with the water distributor body 5, and a support seat pin groove 2-8 is designed to fix it to the water distributor body 5 through pins. A bridge-type flow hole is designed on the support seat, which is connected to the bridge channel of the water distributor to achieve flow during the test and reduce inter-layer interference.

[0033] like Figure 4As shown, the water distributor body 5 is provided with two crescent-shaped holes, which are water outlets. A metal guide ring 5-3 is provided on the water outlet, and a ceramic water outlet 5-4 is provided inside the metal guide ring 5-3. The hole is a bridge channel of the water distributor to ensure that the single-layer adjustment process does not affect the normal water injection of other layers. The first, second, third and fourth sealing rubber rings 5-1, 5-2, 5-5 and 5-6 are provided on the water distributor body 5 above and below the water outlet, respectively.

[0034] The water distributor body 5 is connected to the positioning mechanism 2 by welding, and the coaxial design is realized after welding to ensure smooth adjustment of the water nozzle. The water outlet 7, the fixed water nozzle front sleeve 6, the fixed water nozzle rear sleeve 8, and the flow regulating plate 9 jointly establish a water injection channel, which realizes the shortest distance to connect the oil pipe with the oil casing annulus, reducing the blockage problem caused by the excessive length of the water nozzle flow channel.

[0035] like Figure 5 As shown, four adjustment grooves 4-4 are designed on the concentric movable cylinder 4, which are used to dock with the adjustment instrument concentrically and adjust the opening of the fixed water nozzle of the water distributor. The upper and lower ends of the adjustment groove 4-4 are respectively designed with a reverse release groove 4-1 and a forward release groove 4-2, which meet the adjustment of the measuring and adjusting instrument to the end, and smoothly disengage to avoid the instrument from getting stuck. A fluororubber ring 4-3 is designed on the upper section of the concentric movable cylinder 4, which has a self-lubricating function, straightens the concentric movable cylinder 4 in the positioning platform, and reduces the torque during rotation. An adjustment thread 4-5 is also designed on the concentric movable cylinder 4, which matches and docks with the adjustment thread on the positioning platform 2 to complete the rotation adjustment of the concentric movable cylinder 4. A ceramic water nozzle 4-6 is designed at the lower end of the concentric movable cylinder 4, and a bonding thread 4-7 is designed between the ceramic water nozzle and the concentric movable cylinder 4. The bonding thread not only ensures the concentricity between the two, but also improves the bonding effect to avoid loosening and falling off in the later stage. The concentric movable cylinder 4 moves up and down with the adjustment of the downhole regulator, thereby changing the opening of the fixed water nozzle to achieve stratified flow regulation.

[0036] The flow-stabilizing regulating piece design is adopted. When the wellbore pressure fluctuates slightly, the flow-stabilizing regulating piece will automatically adjust. On the basis of the fixed water nozzle adjustment, the stratified flow rate will be slightly adjusted to improve the qualified rate of stratified water injection.

[0037] The concentric movable cylinder 4 is designed with four adjustment grooves for concentrically docking with the regulating instrument to adjust the opening of the water distributor regulating mechanism. The concentric movable cylinder 4 moves up and down with the adjustment of the downhole regulating instrument, thereby changing the opening of the fixed water nozzle and realizing stratified flow regulation. The main structure of the water distributor is designed with two crescent-shaped holes, which are bridge channels of the water distributor to ensure that the single-layer adjustment process does not affect the normal water injection of other layers. The main body of the water distributor is connected to the positioning mechanism by welding. After welding, a coaxial design must be achieved to ensure smooth adjustment of the water nozzle. The positioning structure of the water distributor is designed with two rectangular drainage holes to prevent dirt in the concentric movable cylinder, which may cause obstruction in measurement and adjustment.

[0038] The implementation process of the bridge type concentric constant flow water distributor is specifically described below through an embodiment.

[0039] The above-mentioned bridge-type concentric constant flow water distributor is used in conjunction with the packer to realize the design of the stratified water injection string. The water distributor is designed with a downhole stratified flow constant flow structure. The fixed water nozzle structure is designed with a flow stabilizing adjustment plate, a flow stabilizing spring and other structures. When the fixed water nozzle is used to adjust the outlet opening, the pressure before and after the fixed water nozzle is further adjusted to achieve a stable outlet flow of the water distributor. During the field test, the concentric movable cylinder of the water distributor is first adjusted to adjust the opening of the fixed water nozzle, and then the flow stabilizing adjustment plate of the water distributor automatically adjusts the opening of the fixed water nozzle to further stabilize the stratified flow change and ensure a certain degree of stratified flow stability.

[0040] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present invention, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A bridge-type concentric constant-flow water distributor, comprising an upper joint (1), a connecting sleeve (3) and a lower joint (12) connected in sequence, characterized in that: The connecting sleeve (3) is provided with a concentric movable cylinder (4) connected by a positioning platform (2), the concentric movable cylinder (4) is supported in a lower joint (12), and the concentric movable cylinder (4) is externally sleeved in a water distributor body (5); the water distributor body (5) is provided with a water distributor bridge channel composed of a fixed water nozzle and a water outlet (7) communicating with the connecting sleeve (3) and the concentric movable cylinder (4), a flow stabilizing regulating plate (9) is provided in the fixed water nozzle, and a flow stabilizing spring (10) is installed at the lower end of the flow stabilizing regulating plate (9); The fixed water nozzle comprises a water outlet (7) arranged on the water distributor body (5); a fixed water nozzle front sleeve (6) and a fixed water nozzle rear sleeve (8) are respectively arranged inside and outside the side wall of the water distributor body (5) corresponding to the water outlet (7); a flow stabilizing regulating plate (9) is arranged between the fixed water nozzle front sleeve (6) and the fixed water nozzle rear sleeve (8); the water distributor body (5) and the positioning platform (2) are coaxially designed; the water outlet (7), the fixed water nozzle front sleeve (6), the fixed water nozzle rear sleeve (8) and the flow stabilizing regulating plate (9) jointly establish a water injection channel; The flow stabilizing spring (10) is fixedly mounted on the water distributor body (5) which is connected to the support seat (11) below the flow stabilizing regulating plate (9); The concentric movable cylinder (4) is provided with four adjustment grooves (4-4), and the upper and lower ends of the adjustment grooves (4-4) are respectively provided with positive and reverse release grooves; and are used for concentrically docking with the adjustment instrument to adjust the opening of the fixed water nozzle of the water distributor; The concentric movable cylinder (4) moves up and down as the downhole regulator is adjusted. The concentric movable cylinder of the water distributor is first adjusted to adjust the opening of the fixed water nozzle. Then, the flow stabilizing regulating piece of the water distributor automatically adjusts the opening of the fixed water nozzle. The flow stabilizing spring (10) is automatically adjusted under the impact of water flow pressure to change the opening between the flow stabilizing regulating piece (9) and the fixed water nozzle, thereby controlling the fluctuation of the stratified water injection flow.

2. A bridge type concentric constant flow water distributor according to claim 1, characterized in that: The tail of the concentric movable cylinder (4) is supported in the lower joint (12) via a support seat (11).

3. A bridge type concentric constant flow water distributor according to claim 2, characterized in that: The support seat (11) is provided with a bridge-type flow hole which is in communication with the bridge-type channel of the water distributor.

4. A bridge type concentric constant flow water distributor according to claim 1, characterized in that: A positioning anti-reversal groove (2-1) for positioning and docking with the measuring and adjusting instrument is provided above the positioning platform (2); the middle section inside the positioning platform (2) is a straightening section, and the concentric movable cylinder (4) is sleeved inside the section; a sewage discharge hole (2-3), an adjustment thread (2-6), a knife retreat groove (2-5) and a sealing rubber ring (2-4) are designed in the middle of the positioning platform (2); the adjustment thread (2-6) is docked with the adjustment thread on the concentric movable cylinder (4).

5. A bridge type concentric constant flow water distributor according to claim 1, characterized in that: The flow stabilizing regulating piece (9) is provided with a water outlet, the length of which is half the length of the elliptical water outlet of the fixed water nozzle rear sleeve (8), and the fixed water nozzle front sleeve (6), the fixed water nozzle rear sleeve (8) and the flow stabilizing regulating piece (9) are aligned at the upper end of the water outlet.

6. A bridge type concentric constant flow water distributor according to claim 5, characterized in that: The middle part of the flow stabilizing regulating plate (9) is made of ceramic material; the fixed faucet front sleeve (6) and the fixed faucet rear sleeve (8) are respectively elliptical water outlets, and the two water outlets are completely aligned.

7. A bridge type concentric constant flow water distributor according to claim 1, characterized in that: Sealing rubber rings are provided on the upper and lower parts of the fixed faucet front sleeve (6), the fixed faucet rear sleeve (8) and the flow stabilizing adjustment sheet (9); retaining rings are provided on the sealing rubber rings at the upper and lower ends of the flow stabilizing adjustment sheet (9).

8. A bridge type concentric constant flow water distributor according to claim 1, characterized in that: The water outlet (7) on the water distributor body (5) is a crescent-shaped hole on the outside of the water distributor body (5), and the water distributor body (5) is coaxially arranged with the positioning platform (2).

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