A miscible flooding concentric adjustable water distributor

Abstract

The utility model discloses a mixed phase drive concentric adjustable water distributor, which comprises the following steps: the upper joint lower end and the fixed core upper end are connected through threads, the valve seat is sleeved on the outside of the upper joint and the fixed core, the valve seat is connected with the upper joint through a pin, the sleeve inner wall is a inverted conical corrugated core structure, which is sleeved on the lower part of the fixed core, the adjusting core outer wall is a inverted conical corrugated core structure, which is sleeved on the lower part of the sleeve through a bearing to form an annulus, the rotating core is connected with the middle part of the adjusting core through a trapezoidal thread, and the lower joint upper end is connected with the sleeve bottom through threads. The utility model solves the problems of adjustable injection in the downhole layering, effective prevention of the injection of the medicine return, and reduction of the chemical agent adhesion loss rate.

Description

Technical Field

[0001] This utility model relates to the field of mixed-phase drive concentric adjustable water distributor. Background Technology

[0002] Currently, most stratified chemical flooding wells in oilfields use downhole eccentric injectors, which cannot monitor the entire process during stratified injection. Furthermore, during drop-out testing, it is often necessary to repeatedly add water nozzles until the water volume reaches the injector's requirements, especially in wells with more than three strata, resulting in a large workload and low efficiency in on-site drop-out testing. However, by adopting an integrated measurement and adjustment sub-injection process, which communicates with the surface intelligent control system via cable, real-time monitoring of parameters such as flow rate and pressure can be achieved, enabling simultaneous measurement and adjustment, significantly reducing the workload. The adjustable downhole water distributor in miscible flooding wells is the most critical tool in the integrated measurement and adjustment string. It can adjust the injection core through an electromagnetic concentric measurement and adjustment instrument to control the injection volume. In oilfield chemical flooding blocks, the proportion of sub-injection in wells with three or more strata accounts for more than 50%, and the demand for multiple sub-injection production in chemical flooding wells will increase. The existing concentric adjustable water distributor cannot meet the needs of low-flow, low-shear injection. This concentric adjustable water distributor for miscible flooding can meet the requirements of low-shear injection, reduce the viscosity loss rate of chemical agents, realize simultaneous testing and adjustment, and improve the testing efficiency of stratified chemical flooding wells. Utility Model Content

[0003] The purpose of this invention is to provide a concentric adjustable water distributor for mixed-phase flooding, which solves the problems of adjustable downhole stratified injection, effective prevention of injected chemical backflow, and reduction of chemical viscosity loss rate.

[0004] To achieve the purpose of this utility model, a mixed-phase driven concentric adjustable water distributor is provided, comprising: an upper connector, a fixed core, a valve seat, a sleeve, an adjusting core, a rotating core, and a lower connector. The lower end of the upper connector and the upper end of the fixed core are connected by threads. The valve seat is sleeved on the outside of the upper connector and the fixed core and is connected to the upper connector by a pin. The inner wall of the sleeve is an inverted conical corrugated core structure and is sleeved on the lower part of the fixed core. The outer wall of the adjusting core is an inverted conical corrugated core structure and is sleeved on the lower part of the sleeve by a bearing to form an annular space. The rotating core is connected to the middle part of the adjusting core by a trapezoidal thread. The upper end of the lower connector is connected to the bottom of the sleeve by threads.

[0005] As a preferred embodiment of this utility model, a spring is fitted into the gap between the lower end of the upper connector and the fixed core and the valve seat to form a water outlet.

[0006] As a preferred embodiment of this utility model, the sleeve has symmetrical water inlet holes in the middle and pin holes at the lower end; the outer surface of the adjusting core has an annular arc groove and the upper part has symmetrical long grooves, and multiple annular grooves are provided between the adjusting core and the sleeve.

[0007] As a preferred technical solution of this utility model, it includes a stabilizing pin, which is fixed by passing through the pin hole of the sleeve and forming a limiting position with the long groove.

[0008] As a preferred technical solution of this utility model, the inner wall of the fixed core is provided with a type I spline groove and a pressure-through hole at the bottom end; the inner wall of the rotating core is provided with a type II spline groove, a symmetrical pressure relief hole in the middle, and a flow passage hole at the bottom.

[0009] As a preferred technical solution of this utility model, it includes a pressure ring and a C-shaped sealing ring. The pressure ring is threadedly connected to the inner wall of the lower connector, and the C-shaped sealing ring is sleeved between the pressure ring and the lower connector.

[0010] As a preferred technical solution of this utility model, the fixed core, the sleeve and the adjusting core are sealed by multiple sets of O-rings.

[0011] Compared with existing technologies, this utility model provides a concentric adjustable water distributor for miscible flooding, which has the following advantages: This concentric adjustable water distributor for miscible flooding is lowered into the designed downhole position along with the stratified injection tubing. After the packer is seated, it isolates the injection layers. When the packer is pressurized and seated, the valve seat and sleeve abut against and block the inlet. The injection pressure passes through the flow hole at the bottom of the rotating core, and then through the annular groove between the sleeve and the adjusting core, entering the inlet of the sleeve. The water pressure generates an upward thrust, pushing the valve seat and spring. When the water pressure is greater than the shear force of the pin on the valve seat, the pin shears off. When stratified injection is required, it needs to be used with a dedicated electromagnetic concentric measuring and adjusting instrument. The measuring and adjusting instrument mainly consists of a three-parameter tester (temperature, flow rate, and pressure), a positioning gripper, and a rotary adjusting mechanism. During stratified injection, a dedicated electromagnetic concentric measuring and adjusting instrument is lowered into the tubing via cable to the designed depth of the mixed-phase drive concentric adjustable water distributor. The ground control system sends a signal via cable, causing the positioning claws to open and engage in a type I spline groove on the inner wall of the fixed core. The rotating adjustment mechanism engages in a type II spline groove on the inner wall of the rotating core. The ground control system sends a signal to cause the rotating adjustment mechanism to rotate forward or backward. The rotating adjustment mechanism drives the rotating core to rotate, causing the adjusting core to move up and down along the sleeve, thereby adjusting the size of the annular space between the sleeve and the adjusting core. The long groove on the upper part of the adjusting core engages with the stabilizing pin. The adjusting core acts as a limiter when moving up and down. During chemical injection, the chemical enters the annular groove between the sleeve and the adjusting core through the flow hole at the bottom of the rotating core, and then enters the water inlet of the sleeve. The injection pressure pushes the valve seat and spring upward through the water inlet of the sleeve and the pressure transmission hole on the fixed core, exposing the water inlet. The chemical is then injected into the formation through the water inlet between the valve seat and the sleeve. According to the designed injection volume, the ground control box of the electromagnetic concentric measuring and adjusting instrument transmits flow, pressure, and temperature data via cable, and controls the size of the annular groove between the adjusting core and the sleeve in real time, thereby controlling the flow rate and achieving simultaneous measurement and adjustment. Multiple evenly distributed annular arc grooves on the outer surface of the adjusting core reduce the shear rate of the chemical agent, resulting in a low viscosity loss rate of the chemical agent solution, effectively preserving the viscosity of the chemical agent, thus not affecting the oil displacement effect of the chemical agent viscosity during injection. When injection stops, the valve seat automatically closes the outlet under the action of the spring, preventing the injected liquid from flowing back into the oil pipe. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the annular groove structure of this utility model;

[0014] Figure 3 This is a schematic diagram of the structure of the fixing core of this utility model;

[0015] Figure 4 This is a schematic diagram of the structure of a spline groove of this utility model;

[0016] Figure 5 This is a schematic diagram of the structure of the adjusting core of this utility model;

[0017] Figure 6 This is a schematic diagram of the structure of the long groove of this utility model;

[0018] Figure 7 This is a schematic diagram of the rotating core of this utility model;

[0019] Figure 8 This is a schematic diagram of the structure of the Type II spline groove of this utility model.

[0020] 1 is the upper connector, 2 is the fixed core, 3 is the valve seat, 4 is the sleeve, 5 is the adjusting core, 6 is the rotating core, 7 is the lower connector, 8 is the pin, 9 is the bearing, 10 is the spring, 11 is the stabilizing pin, 12 is the pressure ring, 13 is the C-type metal sealing ring, 111 is the water inlet, 161 is the long groove, 162 is the annular groove, 201 is the type I spline groove, 202 is the pressure transmission hole, 171 is the type II spline groove, 172 is the pressure relief hole, and 173 is the flow passage hole. Detailed Implementation

[0021] 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.

[0022] See Figures 1-8 This utility model provides a mixed-phase driven concentric adjustable water distributor, including: an upper connector 1, a fixed core 2, a valve seat 3, a sleeve 4, an adjusting core 5, a rotating core 6, and a lower connector 7. The lower end of the upper connector 1 and the upper end of the fixed core 2 are connected by threads. The valve seat 3 is sleeved on the outside of the upper connector 1 and the fixed core 2 and is connected to the upper connector 1 by a pin 8. The inner wall of the sleeve 4 is an inverted conical corrugated core structure and is sleeved on the lower part of the fixed core 2. The outer wall of the adjusting core 5 is an inverted conical corrugated core structure and is sleeved on the lower part of the sleeve 4 through a bearing 9 to form an annular space. The rotating core 6 is connected to the middle part of the adjusting core 5 by a trapezoidal thread. The upper end of the lower connector 7 is connected to the bottom of the sleeve 4 by threads.

[0023] In one embodiment of this utility model, a spring 10 is fitted into the gap between the lower end of the upper connector 1 and the fixed core 2 and the valve seat 3 to form a water outlet.

[0024] In one embodiment of this utility model, the sleeve 4 is provided with symmetrical water inlet holes 111 in the middle and pin holes at the lower end; the outer surface of the adjusting core 5 is provided with an annular arc groove and the upper part is provided with symmetrical long grooves 161, and multiple annular grooves 162 are provided between the adjusting core 5 and the sleeve 4.

[0025] In one embodiment of the present invention, a stabilizing pin 11 is included, which passes through the pin hole of the sleeve 4 for fixation and forms a limiting position with the long groove 161.

[0026] In one embodiment of the present invention, the inner wall of the fixed core 2 is provided with a type 1 spline groove 201 and a pressure hole 202 at the bottom end; the inner wall of the rotating core 6 is provided with a type 2 spline groove 171, a symmetrical pressure relief hole 172 in the middle, and a flow passage hole 173 at the bottom.

[0027] In one embodiment of this utility model, a pressure ring 12 and a C-shaped sealing ring 13 are included. The pressure ring 12 is threadedly connected to the inner wall of the lower connector 7, and the C-shaped sealing ring 13 is sleeved between the pressure ring 12 and the lower connector 7.

[0028] In one embodiment of this utility model, the fixed core 2, the sleeve 4 and the adjusting core 5 are sealed by multiple sets of O-rings.

[0029] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A mixed-phase driven concentric adjustable water distributor, characterized in that, include: The upper connector (1), fixed core (2), valve seat (3), sleeve (4), adjusting core (5), rotating core (6) and lower connector (7) are connected by threads at the lower end of the upper connector (1) and the upper end of the fixed core (2). The valve seat (3) is sleeved on the outside of the upper connector (1) and the fixed core (2). The valve seat (3) is connected to the upper connector (1) by a pin (8). The inner wall of the sleeve (4) is an inverted conical corrugated core structure and is sleeved on the lower part of the fixed core (2). The outer wall of the adjusting core (5) is an inverted conical corrugated core structure and is sleeved on the lower part of the sleeve (4) through a bearing (9) to form an annular space. The rotating core (6) is connected to the middle part of the adjusting core (5) by a trapezoidal thread. The upper end of the lower connector (7) is connected to the bottom of the sleeve (4) by threads.

2. The mixed-phase drive concentric adjustable water distributor according to claim 1, characterized in that: A spring (10) is fitted into the gap between the lower end of the upper connector (1), the fixed core (2), and the valve seat (3) to form a water outlet.

3. The mixed-phase drive concentric adjustable water distributor according to claim 1, characterized in that: The sleeve (4) has symmetrical water inlet holes (111) in the middle and pin holes at the lower end; the outer surface of the adjusting core (5) has an annular arc groove and a symmetrical long groove (161) at the upper part, and multiple annular grooves (162) are provided between the adjusting core (5) and the sleeve (4).

4. A mixed-phase drive concentric adjustable water distributor according to claim 3, characterized in that: It includes a stabilizing pin (11), which is fixed by passing through the pin hole of the sleeve (4) and forming a limit with the long groove (161).

5. A mixed-phase drive concentric adjustable water distributor according to claim 1, characterized in that: The inner wall of the fixed core (2) is provided with a type I spline groove (201) and a pressure hole (202) at the bottom end; the inner wall of the rotating core (6) is provided with a type II spline groove (171), a symmetrical pressure relief hole (172) in the middle, and a flow passage hole (173) at the bottom.

6. A mixed-phase drive concentric adjustable water distributor according to claim 1, characterized in that: It includes a pressure ring (12) and a C-shaped sealing ring (13). The pressure ring (12) is connected to the inner wall of the lower connector (7) by a thread, and the C-shaped sealing ring (13) is sleeved between the pressure ring (12) and the lower connector (7).

7. A mixed-phase drive concentric adjustable water distributor according to claim 1, characterized in that: The fixed core (2), sleeve (4) and adjusting core (5) are sealed by multiple sets of O-rings.

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