Water injection well layered pressure precision measuring device

Abstract

The utility model discloses water injection well layered pressure precision measuring device relates to the technical field of measuring instrument for oilfield water injection well, the utility model discloses a sleeve is equipped with the sealing ring on the sleeve, and the sleeve is equipped with two groups on the sealing ring, the sleeve is equipped with the liquid outlet hole in the symmetry of two sides between two groups sealing rings, the lower extreme of sleeve is equipped with the flow inlet, the upper extreme fixed connection of sleeve has the pull -out head, and the lower extreme of sleeve is screwed and has the filter sleeve. The utility model discloses the filter sleeve that sets up, can filter the liquid in the flow inlet, prevents the measuring accuracy of pressure sensor from the impurity in liquid, thereby can be more accurate to the layered pressure measurement of water injection well, through the rotation of waterproof motor drive U -shaped cleaning support together with the bristle, can clean the impurity on the filter sleeve filter screen, prevent filter sleeve blockage, through the screwing of connecting bolt, can dismantle U -shaped cleaning support and filter sleeve and clean or replace.

Description

Technical Field

[0001] This utility model belongs to the technical field of measuring instruments for oilfield water injection wells, and in particular relates to a device for precise measurement of stratified pressure in water injection wells. Background Technology

[0002] A water injection well is a well used to inject water into an oil reservoir. During oilfield development, water is injected into the reservoir through specialized water injection wells to maintain or restore reservoir pressure, providing a strong driving force to improve the reservoir's extraction rate and recovery rate. To better understand and analyze the pressure changes in different layers of the water injection well and achieve rational water injection to improve recovery, it is necessary to measure the layered pressure of the water injection well. A search revealed that patent application number 02224753.X discloses a pressure and flow measurement device for layered water injection wells in oilfields. This device includes an outer casing with an outlet orifice. One end of the outer casing has a pull-out head, and the outer side of the outer casing has a locking head and a sealing ring. The locking head is connected to the pull-out head via a locking pin. The other end of the outer casing has an inlet orifice, a water injection nozzle, a pressure sensor, and a flow sensor arranged sequentially. The pressure sensor and flow sensor are connected to a controller, and a power supply connected to the controller is located at the rear end of the controller.

[0003] However, during actual use, the applicant found that when measuring the pressure of the injection well, the lower end of the outer casing lacked a filter structure, which could not filter the liquid entering the inner casing from the inlet hole. This caused impurities in the liquid to enter the inner casing along with the liquid, which in turn affected the measurement results of the pressure sensor inside the outer casing, making the measurement results inaccurate. In view of this, we propose a precise measurement device for the layered pressure of the injection well. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0005] This utility model relates to a precise pressure measurement device for stratified water injection wells, comprising an outer casing, on which a sealing ring is fitted, and two sets of sealing rings are arranged vertically on the outer casing. Symmetrical outlet holes are opened on both sides of the outer casing between the two sets of sealing rings. An inlet hole is opened at the lower end of the outer casing. A puller head is fixedly connected to the upper end of the outer casing. A filter sleeve is threadedly connected to the lower end of the outer casing. A pressure sensor is fixedly installed inside the outer casing. A water injection nozzle is fixedly installed in the outer casing below the pressure sensor. A controller is fixedly installed in the outer casing above the pressure sensor. A waterproof motor is embedded in the outer casing below the pressure sensor. The output end of the waterproof motor is connected to a U-shaped cleaning bracket via a rotating shaft. Brush bristles are fixedly installed on the inner walls of both ends of the U-shaped cleaning bracket.

[0006] Preferably, the output end of the waterproof motor is coaxially connected to the upper end of the rotating shaft, and the filter sleeve has a through hole in the middle to avoid the rotating shaft.

[0007] Preferably, the U-shaped cleaning bracket has a rectangular protrusion in the middle, and the lower end of the rotating shaft has a rectangular groove that mates with the rectangular protrusion. The U-shaped cleaning bracket is fixed to the lower end of the rotating shaft by connecting bolts.

[0008] Preferably, the upper end of the connecting bolt passes through the rectangular protrusion and is screwed into the threaded hole at the lower part of the rotating shaft.

[0009] Preferably, the bristles clean along the filter screen provided on the lower outer wall of the filter sleeve, and the interior of the filter sleeve is connected to the interior of the outer sleeve through the inlet hole.

[0010] Preferably, the lower end of the outer sleeve has an external thread, and the upper end of the filter sleeve has an internal thread that mates with the external thread.

[0011] This utility model has the following beneficial effects:

[0012] This utility model of a precise pressure measuring device for stratified water injection wells uses a filter sleeve to filter the liquid entering the inlet hole, preventing impurities in the liquid from affecting the measurement accuracy of the pressure sensor. This makes the measurement of stratified pressure in the water injection well more accurate. A waterproof motor drives the U-shaped cleaning bracket and brush to rotate, which can clean the impurities on the filter screen of the filter sleeve and prevent the filter sleeve from becoming clogged. By unscrewing the connecting bolts, the U-shaped cleaning bracket and filter sleeve can be disassembled for cleaning or replacement. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments 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.

[0014] Figure 1 This is a schematic diagram of the external structure of the precision pressure measurement device for water injection wells according to this utility model;

[0015] Figure 2 This is a schematic diagram of the internal structure of the precision pressure measurement device for water injection wells according to this utility model;

[0016] Figure 3 This utility model relates to a precise pressure measurement device for stratified water injection wells. Figure 2 Enlarged view of the structure at point A in the middle;

[0017] Figure 4 This is a schematic diagram of the U-shaped cleaning bracket in the precision pressure measurement device for water injection wells of this utility model.

[0018] The attached diagram lists the components represented by each number as follows:

[0019] 1. Outer sleeve; 11. Liquid outlet; 12. Inlet; 2. Sealing ring; 3. Pull-out head; 4. Filter sleeve; 41. Through hole; 5. U-shaped cleaning bracket; 51. Brush bristles; 52. Rectangular protrusion; 6. Controller; 7. Pressure sensor; 71. Water inlet nozzle; 8. Waterproof motor; 9. Rotating shaft; 10. Connecting bolts. Detailed Implementation

[0020] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-4 As shown, this utility model provides a technical solution:

[0022] The water injection well stratified pressure precision measurement device includes an outer casing 1, on which a sealing ring 2 is fitted. Two sets of sealing rings 2 are arranged vertically on the outer casing 1. Symmetrical outlet holes 11 are opened on both sides of the outer casing 1 between the two sets of sealing rings 2. An inlet hole 12 is opened at the lower end of the outer casing 1. A puller head 3 is fixedly connected to the upper end of the outer casing 1. A filter sleeve 4 is threadedly connected to the lower end of the outer casing 1. An external thread is opened at the lower end of the outer casing 1, and an internal thread is opened at the upper end of the filter sleeve 4 to mate with the external thread. The interior of the filter sleeve 4 communicates with the interior of the outer casing 1 through the inlet hole 12. A pressure sensor 7 is fixedly installed inside the outer casing 1. Below the pressure sensor 7... A water inlet 71 is fixed inside the outer casing 1. A controller 6 is fixedly installed inside the outer casing 1 above the pressure sensor 7. A power supply for power supply is embedded in the upper part of the outer casing 1. The controller 6 includes a processor, an analog-to-digital converter, a data storage device, and an output interface. The analog-to-digital converter, the data storage device, and the output interface are respectively connected to the processor. The pressure sensor 7 is connected to the analog-to-digital converter through a wire. The controller 6 is electrically connected to the power supply. Through the filter sleeve 4, the liquid entering the inlet hole 12 can be filtered to prevent impurities in the liquid from affecting the measurement accuracy of the pressure sensor 7, thereby making the measurement of the stratified pressure of the water injection well more accurate.

[0023] A waterproof motor 8 is embedded in the outer sleeve 1 below the pressure sensor 7. The output end of the waterproof motor 8 is connected to a U-shaped cleaning bracket 5 via a rotating shaft 9. The output end of the waterproof motor 8 is coaxially connected to the upper end of the rotating shaft 9. A through hole 41 is provided in the middle of the filter sleeve 4 to avoid the rotating shaft 9. Brush bristles 51 are fixedly provided on the inner walls of both ends of the U-shaped cleaning bracket 5. A rectangular protrusion 52 is provided in the middle of the U-shaped cleaning bracket 5. A rectangular groove that mates with the rectangular protrusion 52 is provided at the lower end of the rotating shaft 9. The connecting bolt 10 is fixed to the lower end of the rotating shaft 9. The upper end of the connecting bolt 10 passes through the rectangular protrusion 52 and is screwed into the threaded hole at the lower part of the rotating shaft 9. The bristles 51 clean along the filter screen set on the lower outer wall of the filter sleeve 4. The U-shaped cleaning bracket 5 and the bristles 51 are rotated by the waterproof motor 8, which can clean the impurities on the filter screen of the filter sleeve 4 and prevent the filter sleeve 4 from being blocked. By unscrewing the connecting bolt 10, the U-shaped cleaning bracket 5 and the filter sleeve 4 can be disassembled for cleaning or replacement.

[0024] Working principle: During use, the liquid is filtered through the filter sleeve 4 and enters the outer sleeve 1 through the inlet hole 12. The liquid in the outer sleeve 1 is controlled by the water inlet 71 and then enters the pressure sensor 7. It is then discharged through the outlet hole 11. The pressure sensor 7 is subjected to the hydraulic pressure after being blocked by the water inlet 71 and outputs a pressure signal to the digital-to-analog converter inside the controller 6. The digital-to-analog converter receives the pressure signal and converts it into a digital signal. After being processed by the processor inside the controller 6, it is stored in the data memory inside the controller 6. During the measurement process, the waterproof motor 8 can drive the rotating shaft 9 to rotate. The rotation of the rotating shaft 9 can drive the U-shaped cleaning bracket 5 and the brush 51 to rotate. The brush 51 cleans the filter screen of the filter sleeve 4 to prevent the filter screen from being blocked by impurities. When the measurement task is completed and data needs to be played back, the processor outputs the data stored in the data memory through the output interface on the controller 6. This output signal can be used by the playback instrument to draw pressure-time curves and flow-time curves, or it can be output to a computer for further analysis.

[0025] The text shows and describes the basic principles, main features and advantages of this utility model. The standard parts used in this utility model can all be purchased from the market, and the irregular parts can be customized according to the description and drawings. The specific connection methods of each part can all adopt conventional methods such as bolts, rivets and welding that are mature in the prior art. The machinery, parts and equipment can all adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art. This part will not be described in detail in the text.

[0026] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0027] The above are merely preferred embodiments of the present utility model and do not limit the present utility model. Any modifications to the technical solutions described in the foregoing embodiments or equivalent substitutions of some of the technical features shall fall within the protection scope of the present utility model.

Claims

1. A precise pressure measuring device for stratified water injection wells, comprising an outer casing (1), wherein a sealing ring (2) is fitted on the outer casing (1), and two sets of sealing rings (2) are arranged vertically on the outer casing (1), and liquid outlet holes (11) are symmetrically opened on both sides of the outer casing (1) between the two sets of sealing rings (2), and an inlet hole (12) is opened at the lower end of the outer casing (1), and a puller head (3) is fixedly connected to the upper end of the outer casing (1), characterized in that: The lower end of the outer jacket (1) is threaded with a filter sleeve (4). A pressure sensor (7) is fixedly installed inside the outer jacket (1). A water inlet (71) is fixed in the outer jacket (1) below the pressure sensor (7). A controller (6) is fixedly installed in the outer jacket (1) above the pressure sensor (7). A waterproof motor (8) is embedded in the outer jacket (1) below the pressure sensor (7). The output end of the waterproof motor (8) is connected to a U-shaped cleaning bracket (5) through a rotating shaft (9). Brush bristles (51) are fixedly installed on the inner walls of both ends of the U-shaped cleaning bracket (5).

2. The precise pressure measurement device for stratified water injection wells according to claim 1, characterized in that, The output end of the waterproof motor (8) is coaxially connected to the upper end of the rotating shaft (9), and the filter sleeve (4) has a through hole (41) in the middle to avoid the rotating shaft (9).

3. The precise pressure measurement device for stratified water injection wells according to claim 1, characterized in that, The U-shaped cleaning bracket (5) has a rectangular protrusion (52) in the middle, and the lower end of the rotating shaft (9) has a rectangular groove that matches the rectangular protrusion (52). The U-shaped cleaning bracket (5) is fixed to the lower end of the rotating shaft (9) by connecting bolts (10).

4. The precise pressure measurement device for stratified water injection wells according to claim 3, characterized in that, The upper end of the connecting bolt (10) passes through the rectangular protrusion (52) and is screwed into the threaded hole at the bottom of the rotating shaft (9).

5. The precise pressure measurement device for stratified water injection wells according to claim 1, characterized in that, The bristles (51) clean along the filter screen provided on the lower outer wall of the filter sleeve (4), and the interior of the filter sleeve (4) is connected to the interior of the outer sleeve (1) through the inlet hole (12).

6. The precise pressure measurement device for stratified water injection wells according to claim 1, characterized in that, The lower end of the outer sleeve (1) is provided with an external thread, and the upper end of the filter sleeve (4) is provided with an internal thread that mates with the external thread.

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