Constant-flow water distributor

Abstract

The utility model discloses a constant-flow water distributor, which belongs to the technical field of oilfield water injection and comprises a measuring and adjusting system, a constant-flow system and an auxiliary system. The testing and adjusting system is in butt joint with the testing and adjusting instrument to complete underground testing and adjusting; the constant flow system enables the injection flow to be still kept relatively stable when the injection pressure environment fluctuates within a certain range; the auxiliary system is used for limiting and positioning the testing and adjusting system and the constant flow system. The constant flow valve has the advantages that when the water injection pressure environment fluctuates slightly, the constant flow valve advances and retreats to automatically adjust the gap of the water injection runner, so that the water injection flow is kept relatively stable, the purpose of stable water injection is achieved, a water nozzle does not need to be measured, adjusted or replaced again, the measuring and adjusting workload is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of oilfield water injection, and particularly relates to a constant flow water distributor. Background Art

[0002] With the advancement of oil well exploitation and the strengthening of water injection, the workload of fine water injection in oilfields gradually increases, and the requirement for the stability of injection flow is also getting higher and higher. Currently, the commonly used solution in oilfields is to adopt the combined process of water injection packers for separate production and concentric (eccentric) water distributors. The most important technical defect of this solution is that in a specific pressure environment, for flow measurement and adjustment positioning, to achieve stable water injection, it is necessary to maintain the relative stability of the pressure environment. Once the relative stability of the pressure environment is broken, the injection flow will fluctuate greatly, and it is necessary to re-measure and adjust or replace the water nozzle, resulting in a relatively large measurement and adjustment workload. Summary of the Invention

[0003] In view of the defects existing in the above-mentioned prior art, the purpose of the utility model is to provide a constant flow water distributor to overcome the above-mentioned technical drawbacks.

[0004] The technical solution adopted by the utility model to solve its problems is as follows:

[0005] A constant flow water distributor includes a measurement and adjustment system, a constant flow system, and an auxiliary system; the measurement and adjustment system is docked with a measurement and adjustment instrument to complete downhole measurement and adjustment; the constant flow system enables the injection flow to remain relatively stable when the injection pressure environment fluctuates within a certain range; the auxiliary system is used to limit and position the measurement and adjustment system and the constant flow system.

[0006] Further, the measurement and adjustment system includes a support cylinder, a measurement and adjustment cylinder, a fixing ring, a movable ring, and a measurement and adjustment rod.

[0007] Further, the constant flow system includes a constant flow cylinder, a constant flow valve, a spring cap, a spring, and a spring seat.

[0008] Further, the auxiliary system includes a joint, a connecting cylinder, a positioning rod, a bridge joint, a bridge connecting pipe, a lower joint, and a limit bolt.

[0009] Further, the upper joint is provided with internal threads for connecting the upper tubing. The upper part of the inner cavity of the upper joint is milled with longitudinal flow channels. The upper part of the connecting cylinder is threadedly connected to the upper joint, and the lower part of the connecting cylinder is threadedly connected to the lower joint. The connecting cylinder is phase-locked with the bridge joint through a limit bolt. The lower part of the lower joint is machined with internal tubing threads for connecting with the lower tubing or tools. The inner cavity of the lower joint is machined with a longitudinal bridge channel for downward flow of water injection. The lower part of the measuring and adjusting cylinder is threadedly connected to the upper part of the lower joint. The upper inner cavity of the measuring and adjusting cylinder houses a fixing ring. The lower inner cavity of the measuring and adjusting cylinder is machined with trapezoidal adjusting threads. The measuring and adjusting cylinder is machined with a longitudinal bridge channel, and the bridge channel is communicated with the longitudinal bridge channel on the bridge joint through a bridge connecting pipe. The upper part of the measuring and adjusting rod is cemented with a movable ring. The lower part of the measuring and adjusting rod is provided with a clamping groove for docking with the driving mechanism of the measuring and adjusting instrument. The middle part of the measuring and adjusting rod is machined with trapezoidal external threads for connecting with the trapezoidal internal adjusting threads of the measuring and adjusting cylinder. When the measuring and adjusting rod is driven to rotate, it can drive the movable ring to change its axial position. The fixing ring is located in the upper inner cavity of the measuring and adjusting cylinder and is limited by the spring seat and the measuring and adjusting cylinder. The fixing ring is provided with a waist-shaped measuring hole. The upper part of the bridge joint is limited by the support cylinder, the lower part of the bridge joint is limited by the spring seat, and is circumferentially positioned with the support cylinder through a positioning rod. The bridge joint is circumferentially positioned with the connecting cylinder through a limit bolt. The constant flow cylinder is located in the longitudinal channel at a certain circumferential position on the bridge joint, and houses a constant flow valve, a spring cap and a spring. The spring cap is threadedly connected to the constant flow valve. The constant flow cylinder is provided with lateral flow holes. The middle part of the connecting cylinder is machined with a water injection hole. The bridge joint is also provided with a flow hole. The lateral flow holes on the constant flow cylinder are communicated with the flow hole on the bridge joint and the water injection hole on the connecting cylinder. The lower part of the constant flow valve is in clearance fit with the inner wall of the constant flow cylinder through a small taper. The lower part of the constant flow valve is threadedly connected to the spring cap. The top of the constant flow valve is limited by the support cylinder in its limit position. The spring is located in the space surrounded by the spring seat, the constant flow cylinder and the spring cap, and supports the spring cap and the constant flow valve. The lower part of the support cylinder is limited by the bridge joint, the upper part of the support cylinder is limited by the bottom step of the upper joint, and is circumferentially positioned with the bridge joint through a positioning rod.

[0010] The utility model adopts the above technical solutions and has the following beneficial effects:

[0011] A constant flow water distributor used in the field of oilfield water injection proposed by the utility model can automatically adjust the gap of the water injection flow channel through the advancement and retraction of the constant flow valve when the water injection pressure environment fluctuates slightly, so that the water injection flow rate remains relatively stable, achieving the purpose of stable water injection, without the need to re-measure and adjust or replace the water nozzle, reducing the measuring and adjusting workload and improving the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall cross-section of the present utility model.

[0013] Figure 2 It is a schematic diagram of the measuring and adjusting principle of the present utility model.

[0014] Figure 3This is a schematic diagram of the constant current principle of the present utility model. Specific embodiments

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. The described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0016] Embodiment: As Figure 1 shown, the present utility model provides a constant current water distributor, which includes a measurement and adjustment system, a constant current system, and an auxiliary system; the measurement and adjustment system is responsible for docking with the measurement and adjustment instrument to complete downhole measurement and adjustment; the constant current system enables the injection flow rate to remain relatively stable when the injection pressure environment fluctuates within a certain range; the auxiliary system is the basis for the attachment of the above two systems and is responsible for mechanical functions such as limiting, positioning, and connection.

[0017] The upper joint 1 is provided with internal pipe threads at the top for connecting the upper tubing. The upper part of the inner cavity of the upper joint 1 is milled with longitudinal flow channels, so that even if the central hole is occupied by the measuring and adjusting instrument, normal flow-through water injection can still be carried out. The upper part of the connecting cylinder 3 is threadedly connected to the upper joint 1, and the lower part is threadedly connected to the lower joint 16. The middle part of the connecting cylinder 3 is processed with a water injection hole, which is aligned with the flow-through hole on the bridge joint 10 accommodated in the inner cavity and the flow-through hole on the fixed flow cylinder 5. The connecting cylinder 3 is phase-locked with the bridge joint 10 through the limit bolt 17. The lower part of the lower joint 16 is processed with internal tubing threads to be connected to the lower tubing or tool. The inner cavity of the lower joint 16 is processed with a longitudinal bridge channel, so that even if the central hole is occupied by the measuring and adjusting instrument, downward flow-through water injection can still be carried out through the bridge channel. The lower part of the measuring and adjusting cylinder 12 is threadedly connected to the internal threads of the upper part of the lower joint 16. The upper inner cavity of the measuring and adjusting cylinder 12 accommodates the fixed ring 13, and the lower inner cavity is processed with trapezoidal adjusting threads. The measuring and adjusting cylinder 12 is processed with a longitudinal bridge channel, and this bridge channel is communicated with the longitudinal bridge channel on the bridge joint 10 through the bridge connecting pipe 11. The upper part of the measuring and adjusting rod 15 is strongly glued with the movable ring 14, the lower part is processed with a clamping groove to be docked with the driving mechanism of the measuring and adjusting instrument, and the middle part is processed with trapezoidal external threads to be connected to the trapezoidal internal adjusting threads of the measuring and adjusting cylinder 12. When the measuring and adjusting rod 15 is driven to rotate, it can drive the movable ring 14 to change the axial position. The fixed ring 13 is located in the upper inner cavity of the measuring and adjusting cylinder 12 and is limited by the spring seat 9 and the measuring and adjusting cylinder 12. The fixed ring 13 is provided with a waist-shaped measuring and adjusting hole. The upper part of the bridge joint 10 is limited by the support cylinder 2, the lower part is limited by the spring seat 9, and is circumferentially positioned with the support cylinder 2 through the positioning rod 4, and is also circumferentially positioned with the connecting cylinder 3 through the limit bolt 17. The fixed flow cylinder 5 is located in the longitudinal channel at a certain circumferential position on the bridge joint 10, and it accommodates the fixed flow valve 6, the spring cap 7 and the spring 8. The spring cap 7 is threadedly connected to the fixed flow valve 6. The fixed flow cylinder 5 is provided with a lateral flow-through hole, which is communicated with the flow-through hole on the bridge joint 10 and the water injection hole on the connecting cylinder 3. The lower part of the fixed flow valve 6 is in clearance fit with the inner wall of the fixed flow cylinder through an extremely small taper. The lower part of the fixed flow valve 6 is threadedly connected to the spring cap 7, and the top is limited by the support cylinder 2 to the limit position. The spring 8 is located in the space surrounded by the spring seat 9, the fixed flow cylinder 5 and the spring cap 7, and supports the spring cap 7 and the fixed flow valve 6. The lower part of the support cylinder 2 is limited by the bridge joint 10, the upper part is limited by the bottom step of the upper joint 1, and is circumferentially positioned with the bridge joint 10 through the positioning rod 4.

[0018] The measuring and adjusting principle of the present utility model is as Figure 2As shown in the figure: Under a certain injection pressure environment, the flow measurement and adjustment instrument passes through the fixed flow distributor. The support arm of the flow measurement and adjustment instrument is clamped into the card slot at the upper part of the support cylinder 2. Since the support cylinder 2 is circumferentially positioned with the bridge joint 10 through the positioning rod 4, and the bridge joint 10 is circumferentially positioned with the connecting cylinder 3 through the limit bolt 17, the body of the flow measurement and adjustment instrument is circumferentially positioned relative to the fixed flow distributor. The driving mechanism of the flow measurement and adjustment instrument is clamped into the card slot at the lower end of the flow measurement rod 15. The driving mechanism of the flow measurement and adjustment instrument rotates to drive the flow measurement rod 15 and the movable ring 14 strongly bonded to the flow measurement rod 15 to rotate together, exposing a certain area of the deployment hole on the fixed ring 13. Through relevant measurement means, the injection flow rate is adjusted to reach the design value under this pressure environment, and the measurement and adjustment are completed.

[0019] The fixed flow principle of the present utility model is as Figure 3 shown in the figure: The injected water enters from the inner cavity of the support cylinder 2, passes through the deployment hole on the fixed ring 13 and enters the annular space formed by the flow measurement cylinder 12 and the connecting cylinder 3, and then continues to pass through the spring seat 9, the fixed flow cylinder 5, and the bridge joint 10 in sequence, and finally passes through the water injection hole on the connecting cylinder 3 to penetrate the fixed flow distributor and be injected into the target layer. During the water injection process, the water injection pressure Pz in the oil pipe acts on the upper end face of the fixed flow valve 6, and the reaction pressure Pd of the target layer (the pressure of the target layer itself) acts on the lower end face of the fixed flow valve 6. The injection pressure difference is Pc = Pz - Pd. When the injection pressure Pz increases within a certain range, the injection pressure difference Pc increases. The fixed flow valve 6 automatically moves downward under the action of the injection pressure difference Pc, and the annular flow-through gap between the lower part of the fixed flow valve 6 and the fixed flow cylinder 5 decreases to maintain the stability of the flow rate; conversely, when the injection pressure Pz decreases within a certain range, the injection pressure difference Pc decreases. The fixed flow valve 6 automatically moves upward under the action of the injection pressure difference Pc, and the annular flow-through gap between the lower part of the fixed flow valve 6 and the fixed flow cylinder 5 increases to maintain the stability of the flow rate; when the injection pressure Pz remains unchanged and the reaction pressure of the target layer increases within a certain range, the injection pressure difference Pc decreases. The fixed flow valve 6 automatically moves upward under the action of the injection pressure difference Pc, and the annular flow-through gap between the lower part of the fixed flow valve 6 and the fixed flow cylinder 5 increases to maintain the stability of the flow rate; thus, it is ensured that when the injection pressure environment fluctuates within a certain range, the injection flow rate is relatively stable.

[0020] Explanation of relevant terms:

[0021] Water injection: A process of injecting high-pressure water into the target formation through surface pumping equipment via relevant process pipe strings to supplement the pressure deficit of the corresponding oil layer in the target formation.

[0022] Flow distributor: A downhole tool that controls the injection volume of the target injection layer and provides an injection channel.

[0023] Measurement and adjustment: A process of using a flow measurement and adjustment instrument to control the downhole flow distributor on the ground and test the target injection layer.

[0024] 4. Flow stability: It doesn't mean that the flow is absolutely unchanged, but rather that its variation range is very small, within the allowable error range of the process requirements.

[0025] Of course, the above embodiments are only for explaining the technical concept and characteristics of the present invention. The purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit and essence of the main technical solution of the present invention should be covered within the protection scope of the present invention.

Claims

1. A constant flow water distributor, characterized in that: It includes a measurement and adjustment system, a constant flow system and an auxiliary system; the measurement and adjustment system is connected to the measurement and adjustment instrument to complete downhole measurement and adjustment; the constant flow system ensures that the injection flow rate remains relatively stable when the injection pressure environment fluctuates within a certain range; the auxiliary system is used to limit and position the measurement and adjustment system and the constant flow system.

2. A constant flow water distributor according to claim 1, characterized in that: The measuring and adjusting system comprises a supporting tube (2), a measuring and adjusting tube (12), a fixing ring (13), a movable ring (14) and a measuring and adjusting rod (15).

3. A constant flow water distributor according to claim 1 or 2, characterized in that: The constant flow system comprises a constant flow cylinder (5), a constant flow valve (6), a spring cap (7), a spring (8) and a spring seat (9).

4. A constant flow water distributor according to claim 1 or 2, characterized in that: The auxiliary system comprises a joint (1), a connecting tube (3), a positioning rod (4), a bridge joint (10), a bridge tube (11), a lower joint (16), and a limiting bolt (17).

5. A constant flow water distributor according to claim 4, characterized in that: The upper joint (1) is provided with an internal thread for connecting to an upper oil pipe. The upper inner cavity of the upper joint (1) is milled with a longitudinal flow groove. The upper part of the connecting tube (3) is threadedly connected to the upper joint (1). The lower part of the connecting tube (3) is threadedly connected to the lower joint (16). The connecting tube (3) is phase-locked with the bridge joint (10) through a limit bolt (17). The lower part of the lower joint (16) is machined with an internal thread of an oil pipe for connecting to a lower oil pipe or a tool. The inner cavity of the lower joint (16) is machined with a longitudinal bridge channel for downward flow injection. The lower part of the measuring and adjusting tube (12) is threadedly connected to the upper part of the lower joint (16). The upper inner cavity of the measuring and adjusting tube (12) contains a fixing ring (13). The lower inner cavity of the measuring and adjusting tube (12) is The cavity is processed with a trapezoidal adjustment thread, and a longitudinal bridge channel is processed on the measuring and adjusting tube (12), and the bridge channel is connected with the longitudinal bridge channel on the bridge joint (10) through the bridge tube (11); a movable ring (14) is glued to the upper part of the measuring and adjusting rod (15), and a clamping groove is provided at the lower part of the measuring and adjusting rod (15) for docking with the driving mechanism of the measuring and adjusting instrument; a trapezoidal external thread is processed on the middle part of the measuring and adjusting rod (15) for connecting with the trapezoidal internal adjustment thread of the measuring and adjusting tube (12); when the measuring and adjusting rod (15) is driven to rotate, the movable ring (14) can be driven to change the axial position; the fixed ring (13) is located in the upper inner cavity of the measuring and adjusting tube (12), and is limited by the spring seat (9) and the measuring and adjusting tube (12), and is fixed The fixed ring (13) is provided with a waist-shaped measuring and adjusting hole; the upper part of the bridge joint (10) is limited by the support tube (2), the lower part of the bridge joint (10) is limited by the spring seat (9), and is circumferentially positioned with the support tube (2) through the positioning rod (4), and the bridge joint (10) is circumferentially positioned with the connecting tube (3) through the limiting bolt (17); the constant flow tube (5) is located in a longitudinal channel at a certain circumferential position on the bridge joint (10), and contains a constant flow valve (6), a spring cap (7) and a spring (8), and the spring cap (7) is threadedly connected to the constant flow valve (6); the constant flow tube (5) is provided with a lateral flow hole, the middle part of the connecting tube (3) is processed with a water injection hole, and the bridge joint (10) is also provided with a flow hole, and the constant flow tube (5) is provided with a water injection hole. The lateral flow holes on the flow tube (5) are connected to the flow holes on the bridge joint (10) and the water injection holes on the connecting tube (3); the lower part of the constant flow valve (6) is matched with the inner wall clearance of the constant flow tube (5) through a small taper, the lower part of the constant flow valve (6) is threadedly connected to the spring cap (7), and the top of the constant flow valve (6) is limited to an extreme position by the support tube (2); the spring (8) is located in a space surrounded by the spring seat (9), the constant flow tube (5) and the spring cap (7), and supports the spring cap (7) and the constant flow valve (6); the lower part of the support tube (2) is limited by the bridge joint (10), and the upper part of the support tube (2) is limited by the bottom step of the upper joint (1), and is circumferentially positioned with the bridge joint (10) through the positioning rod (4).

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