Mechanical control mechanism for underground double-control injection allocator

Abstract

The mechanical control mechanism comprises a mechanical measuring and adjusting part body, the two ends of the mechanical measuring and adjusting part body are connected with an outer pipe A and an outer pipe B, a mounting base and an end cover are installed in the outer pipe A, and a center channel is formed in the mounting base, the end cover and the mechanical measuring and adjusting part body; a mounting channel and an electric control liquid inlet channel are further arranged outside the center channel, the mounting channel is communicated with the center channel and communicated with the electric control liquid inlet channel through an electric control liquid inlet, a mechanical control liquid inlet is further formed in the mechanical testing and adjusting part body, the mounting channel is communicated with the outside through a mechanical control liquid outlet, and a driven gear is arranged in the middle of the mounting channel. The two ends of the driven gear are connected with trapezoidal thread transmission screws, the two trapezoidal thread transmission screws are connected with a piston A and a piston B, a driving sleeve and a driving gear are arranged in the center channel, and the driving gear is meshed with the driven gear. The problems existing in a mechanical testing and adjusting part in an underground double-control intelligent injection allocation device of an oil field injection well are solved.

Description

TECHNICAL FIELD

[0001] The application relates to a mechanical control mechanism for a downhole double-control injection allocator, and belongs to the technical field of downhole instruments in oilfields. BACKGROUND

[0002] Due to the special geographical environment, the installation and construction cost of equipment of a single well is extremely high, and the rework cost caused by equipment failure is extremely high. Therefore, the downhole intelligent injection allocator commonly used in offshore oilfields generally requires both electric control function and external gauge control function, and the two functions are realized through an electric control module and a mechanical gauge control part on the instrument. When the electric control function of the instrument is normal, the injection medium of the layer is injected into the formation through the flow control mechanism in the electric control module. When the electric control function fails, the user lowers a direct-reading gauge from the tubing and connects it to the interface reserved on the mechanical gauge control part of the downhole intelligent injection allocator, and controls the flow regulating mechanism on the mechanical gauge control part by controlling the action of the direct-reading gauge, so as to control the size of the injection flow of the layer.

[0003] Through the above-mentioned double-control function, when the electric control part of the downhole intelligent injection allocator fails, the user can also use the previous conventional gauge control mode to lower a direct-reading gauge from the tubing to control the downhole layer flow. Avoiding the complete failure of the injection function of the well due to the failure of the downhole intelligent injection allocator, thereby bringing huge repair operation cost.

[0004] The direct-reading gauge commonly used in oilfields is divided into eccentric and concentric types, which are suitable for eccentric and concentric mechanical water distributors respectively. Due to the excessive length of the guide length required inside the eccentric water distributor and the unreliable docking problem, the structure of the mechanical gauge control part of the existing double-control intelligent injection allocator adopts a similar structure to the concentric mechanical injection allocator. However, this structure will cause the center space of the instrument to be too large, and the space left for the instrument to install components such as motors, circuit boards and sensors is too small, which brings great difficulty to the design of the subsequent electric control module. In addition, the adjustable nozzle part of the concentric mechanical injection allocator has a large diameter, which makes it difficult to achieve fine adjustment of the water flow, and the transmission thread size inside the large-diameter nozzle adjusting mechanism is also large, which requires a higher torque for the direct-reading gauge. SUMMARY

[0005] The purpose of the present application is to provide a mechanical control mechanism for a downhole double-control injection allocator. To solve the problems existing in the mechanical gauge control part of the downhole double-control intelligent injection allocator in an oil injection well.

[0006] The technical scheme of the present application is: a mechanical control mechanism for a downhole double-control injection allocator, comprising a mechanical measuring and adjusting part body located above an electric control module, outer pipes A and B connected to the outer walls of the two ends of the mechanical measuring and adjusting part body, a mounting seat and an end cap loaded into the outer pipe A from top to bottom, the end cap abutting against the upper end surface of the mechanical measuring and adjusting part body, a central passage eccentrically arranged inside the mounting seat, the end cap and the mechanical measuring and adjusting part body, an installation channel and an electric control liquid inlet channel further arranged inside the mounting seat, the end cap and the mechanical measuring and adjusting part body outside the central passage, the installation channel upper end in communication with the central passage, and also in communication with the electric control liquid inlet channel through the electric control liquid inlet on the mounting seat, the electric control liquid inlet channel connected to the electric control module, the installation channel blocked by a plug, the mechanical control liquid inlet further arranged on the mechanical measuring and adjusting part body above the plug to connect the central passage and the installation channel, the mechanical control liquid outlet further arranged on the outer wall of the mechanical measuring and adjusting part body above the mechanical control liquid inlet to connect the installation channel, a driven gear arranged in the middle of the installation channel, trapezoidal thread transmission screws fixedly connected to the upper and lower end surfaces of the driven gear, pistons A and B connected to the two trapezoidal thread transmission screws, a mounting chamber arranged in the middle of the central passage, a driving sleeve and a driving gear nested together arranged in the mounting chamber, the driving gear engaged with the driven gear, a plurality of driving grooves uniformly distributed on the circumference of the driving sleeve, and a plurality of anti-rotation grooves uniformly distributed on the circumference of the mounting seat at the upper end of the central passage.

[0007] In the aforementioned mechanical control mechanism for a downhole double-control injection allocator, the outer periphery of the mechanical measuring and adjusting part body is a stepped structure, the middle outer diameter is greater than the upper and lower end outer diameters, and the upper and lower ends of the outer periphery of the mechanical measuring and adjusting part body are threadedly connected to the inner holes of the outer pipes A and B; a plug is threadedly connected to the end of the installation channel of the mechanical measuring and adjusting part body.

[0008] In the aforementioned mechanical control mechanism for a downhole double-control injection allocator, the upper and lower end surfaces of the driven gear are provided with outwardly extending mounting portions, the transmission screws are fixed to the mounting portions by fixed screws, and the shaft sleeves A and thrust bearings are further sleeved on the mounting portions.

[0009] In the aforementioned mechanical control mechanism for a downhole double-control injection allocator, the driving sleeve, the driving gear and the driven gear are fixedly installed inside the mounting seat by the end cap, and the end cap is fixedly connected to the mounting seat by the connecting screws.

[0010] In the aforementioned mechanical control mechanism for a downhole double-control injection allocator, the mounting seat is fixedly connected to the mechanical measuring and adjusting part body by the fixed bolts.

[0011] The mechanical control mechanism for the downhole double-control injection allocator comprises a ceramic water nozzle installed at the mechanical control outlet of the installation channel, the end of the ceramic water nozzle abutting against the body of the mechanical measuring and adjusting part, a sealing seat arranged at the upper end of the ceramic water nozzle, and the ceramic water nozzle and the sealing seat being sleeved on the outer periphery of the piston B.

[0012] The mechanical control mechanism for the downhole double-control injection allocator comprises a guide sleeve arranged in the installation channel below the driven gear, a sliding groove arranged on the inner wall of the installation channel of the guide sleeve and the mounting seat, and an outwardly protruding guide part arranged on the outer periphery of the piston A and the piston B and clamped into the sliding groove.

[0013] The mechanical control mechanism for the downhole double-control injection allocator comprises a shaft sleeve B arranged on the outer periphery of the driving gear.

[0014] The present application has the following advantages compared with the prior art:

[0015] (1) The mechanical measuring and adjusting part and the direct-reading measuring and adjusting instrument interface part are designed in the same way as the concentric mechanical injection allocator, which is beneficial to controlling the overall instrument length and retaining the advantages of the concentric mechanical injection allocator and the direct-reading measuring and adjusting instrument in easy downhole connection.

[0016] (2) Two-stage gear transmission is adopted to successfully transmit the driving torque on the traditional concentric direct-reading measuring and adjusting instrument to the eccentric adjustable water nozzle part, and the eccentric adjustable water nozzle design is realized on the basis of the concentric connection structure. Due to the eccentric arrangement of the adjustable water nozzle, the outer diameter size of this part is greatly reduced compared with the outer diameter size of the adjustable water nozzle part of the traditional concentric mechanical injection allocator, which is beneficial to fine control of the flow. At the same time, the internal transmission thread size of the adjustable water nozzle is also greatly reduced, which reduces the torque size requirement of the matched direct-reading measuring and adjusting instrument.

[0017] (3) The internal channel of the instrument is arranged eccentrically, and a deeper installation space can be left on one side of the instrument in the radial direction for the installation of various components in the subsequent electric control module, and the selection and related design difficulty of various components in the electric control module are greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The figure is a structural schematic diagram of the present application;

[0019] Figure 2 The figure is a sectional view of the structural schematic diagram of the present application; Figure 1

[0020] Figure 3 The figure is a structural schematic diagram of a concentric direct-reading measuring and adjusting instrument;

[0021] Figure 4 The figure is a schematic diagram of a direct-reading measuring and adjusting instrument controlling a mechanical measuring and adjusting part;

[0022] ​Figure 5 This is a schematic diagram showing the state when the mechanical measurement and adjustment section controls the flow rate to be fully shut off.

[0023] Figure 6 A schematic diagram showing the flow rate and injection status of the mechanical measurement and adjustment section.

[0024] Reference numerals: 1-Outer tube A, 2-Mounting seat, 3-Piston A, 4-Trapezoidal threaded drive screw, 5-Fixing screw, 6-Sleeve A, 7-Thrust bearing, 8-Driven gear, 9-End cover, 10-Guide sleeve, 11-Sealing seat, 12-Ceramic water nozzle, 13-Piston B, 14-Plug, 15-Fixing bolt, 16-Sealing tube, 17-Outer tube B, 18-Mechanical adjustment part body, 19-Connecting screw, 20-Driving gear, 21-Sleeve B, 22-Drive sleeve, 23-Anti-rotation groove, 24-Drive groove, 25-Electrically controlled liquid inlet, 26-Mechanically controlled liquid outlet, 27-Mechanically controlled liquid inlet, 28-Central channel, 29-Mounting channel, 30-Slide groove, 31-Guide part, 32-Electrically controlled liquid inlet channel. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0026] The embodiment of the application discloses a mechanical control mechanism for a downhole double-control injection allocator, which comprises a mechanical measuring and adjusting part body 18 located above an electric control module, outer pipes A1 and B17 fixedly connected to the outer walls of the two ends of the mechanical measuring and adjusting part body 18, a mounting seat 2 and an end cover 9 loaded into the outer pipe A1 from top to bottom, the end cover 9 abutting against the upper end surface of the mechanical measuring and adjusting part body 18, a central passage 28 eccentrically arranged in the mounting seat 2, the end cover 9 and the mechanical measuring and adjusting part body 18, a sealing pipe 16 connected to the end of the mechanical measuring and adjusting part body 18 in the central passage 28, an installation passage 29 and an electric control liquid inlet passage 32 further arranged in the mounting seat 2, the end cover 9 and the mechanical measuring and adjusting part body 18 outside the central passage 28, the upper end of the installation passage 29 in communication with the central passage 28, the upper end of the installation passage 29 in communication with the electric control liquid inlet passage 30 through an electric control liquid inlet 25 on the mounting seat 2, the end of the electric control liquid inlet passage 30 connected to the electric control module, the end of the installation passage 28 plugged by a plug 14, the mechanical control liquid inlet 27 arranged above the mechanical measuring and adjusting part body 18 on the plug 14, the mechanical control liquid inlet 27 in communication with the installation passage 29, the mechanical control liquid outlet 26 further arranged on the outer wall of the mechanical measuring and adjusting part body 18 above the mechanical control liquid inlet 27, the mechanical control liquid outlet 26 in communication with the installation passage 29, so that the installation passage 29 is in communication with the external environment, a driven gear 8 arranged in the installation passage 28, the trapezoidal thread transmission screw 4 fixedly connected to the upper and lower end surfaces of the driven gear 8, the piston A3 and B13 movably sleeved on the two trapezoidal thread transmission screws 4, a ring-shaped installation chamber arranged in the central passage 28, the driving sleeve 22 and the driving gear 20 nested in the installation chamber, the driving gear 20 engaged with the driven gear 8, a plurality of driving grooves 24 uniformly distributed on the circumference of the driving sleeve 22, and a plurality of anti-rotation grooves 23 uniformly distributed on the circumference of the mounting seat 2 at the upper end of the central passage 28.

[0027] The outer periphery of the mechanical measuring and adjusting part body 18 is in a stepped structure, the outer diameter of the middle part is larger than that of the upper and lower ends, the outer periphery of the mechanical measuring and adjusting part body 18 is provided with external threads at the upper and lower ends, the external threads are respectively connected with the inner hole threads of the outer pipes A1 and B17, and the surfaces of the outer pipes A1 and B17 are flush with the outer surface of the middle part of the mechanical measuring and adjusting part body 18 after connection.

[0028] The upper and lower end surfaces of the driven gear 8 are provided with outwardly extending installation parts, the transmission screw 4 is fixed on the installation part through the fixed screw 5, and the shaft sleeve A6 and the thrust bearing 7 are further sleeved on the installation part, so that the accuracy and smoothness of transmission are ensured.

[0029] The driving sleeve 22, the driving gear 20 and the driven gear 8 are fixedly installed in the inside of the mounting base 2 through the end cover 9, wherein the driving sleeve 22 and the driving gear 20 are limited by the end cover 9 and are clamped into the installation chamber of the central passage 28, and the space between the tail end of the installation passage 29 of the mounting base 2 and the end cover 9 is used for installing the driven gear 8, the driven gear 8 is limited and fixed by the mounting base 2 and the end cover 9 at both ends.

[0030] The end cover 9 is fixedly connected with the mounting base 2 through the connecting screw 19, and the mounting base 2 is fixedly connected with the mechanical measuring and adjusting part body 18 through the fixed bolt 15, so that the several main components constituting the mechanical control mechanism are fixedly connected together.

[0031] The ceramic water nozzle 12 is installed at the mechanical control liquid outlet 26 of the installation passage 29, the tail end of the ceramic water nozzle 12 abuts against the mechanical measuring and adjusting part body 18, the upper end of the ceramic water nozzle 12 is provided with the sealing seat 11, the ceramic water nozzle 12 and the sealing seat 11 are sleeved on the outer periphery of the piston B13, the opening size of the ceramic water nozzle 12 is adjusted through the linear motion of the piston B13, and sealing is realized through the sealing seat 11.

[0032] The guide sleeve 10 is arranged in the installation passage 29 below the driven gear 8, the tail end of the guide sleeve 10 abuts against the sealing seat 11, the guide sleeve 10 and the inner wall of the installation passage 29 of the mounting base 2 are each provided with the sliding groove 30, the outer periphery of the piston A3 and the piston B13 is each provided with the outward protruding guide portion 31, the guide portion 31 is clamped into the sliding groove 30, and through the cooperation of the guide portion 31 and the sliding groove 30, when the trapezoidal thread transmission screw 4 rotates, the piston A3 and the piston B13 are driven to move linearly along the sliding groove 30, so that the rotary motion is converted into the linear motion of the piston.

[0033] The shaft sleeve B21 is arranged on the outer periphery of the driving gear 20, so as to ensure the accuracy and smoothness of the transmission of the driving gear 20.

[0034] The technical scheme of the present application is constructed as follows: the mechanical measuring and adjusting part is located at the upper portion of the electric control module of the downhole intelligent injection allocator, and the two are connected through the outer pipe B17. The central passage 28 reserved in the mechanical measuring and adjusting part is also arranged eccentrically, the eccentric distance is consistent with the electric control part, the central passages 28 of the mechanical measuring and adjusting part and the electric control module can be completely aligned after the two are connected, no step is generated at the joint, and the straight-reading type measuring and adjusting instrument can smoothly pass through.

[0035] Two movable plunger valves are installed in the inside of the mechanical measuring and adjusting part, and the two movable plunger valves are respectively connected with the piston A3 and the piston B13 through the connecting pipes A4 and B5. Figure 1The left and right movement of the piston A3 and the piston B13 realizes the opening and closing of the valve and the control of the opening and closing size. The left and right movement of the piston A3 and the piston B13 is driven by the rotation of the trapezoidal thread transmission screw rod 4. The left and right trapezoidal thread transmission screw rods 4 are fixed together through the fixing screw 5 and the driven gear 8. The rotation of the driven gear 8 drives the transmission screw rod 4 to rotate. The stainless steel thrust bearing 7 and the shaft sleeve 6 are respectively installed on the two sides of the driven gear 8, which ensures the accuracy and smoothness of the transmission. The rotation of the driven gear 8 is driven by the driving gear 20, which is installed on the central channel 28 of the mechanical adjustment part. The driving sleeve 22 installed on the central channel 28 is fixedly connected with the driving gear 20. The rotation of the driving sleeve 22 drives the driving gear 20 to rotate. The driving sleeve 22, the driving gear 20, the driven gear 8 and other components are fixedly installed in the installation seat 2 through the end cover 9. The installation seat 2 is fixedly connected to the mechanical adjustment part body 18 through two bolts 15. The upper end of the installation seat 2 is processed with four anti-rotation grooves 23 uniformly distributed in the circumference. The driving sleeve 22 is processed with four driving grooves 24 uniformly distributed in the circumference. The size of the anti-rotation groove 23, the size of the driving groove 24 and the spacing between them are matched with the corresponding size of the positioning claw, the size of the driving claw and the spacing between them of the commonly used concentric direct reading type adjustment instrument (see the attached Figure 3 When the concentric direct reading type adjustment instrument is lowered into the well and the positioning claw is opened and seated on the mechanical adjustment part (see the attached Figure 3 When the concentric direct reading type adjustment instrument is lowered into the well and the positioning claw is opened and seated on the mechanical adjustment part (see the attached Figure 5 The piston A3 and the piston B13 will move to the left side at the same time in the mechanical adjustment process of the mechanical adjustment part. The piston A3 will close the electric control liquid inlet 25 first. At this time, the piston B13 is still in the state of closing the mechanical liquid outlet 26 (see the attached Figure 6 The user can accurately control the injection flow size of the layer by controlling the opening size of the mechanical liquid outlet 26 of the layer.

[0036] The downhole intelligent injection distributor adopting the scheme has two injection channels in total, which are an injection channel controlled by an electric control module of the downhole intelligent injection distributor and an injection channel controlled by a downreadable downhole measuring and adjusting instrument (mechanical control) through another downhole operation. The electric control liquid inlet 25 is located in the mechanical measuring and adjusting part, and the electric control liquid inlet 25 is kept open during the normal working process of the downhole intelligent injection distributor. The injection medium in the oil pipe is bent by 90 degrees through the electric control liquid inlet 25 and then enters the electric control liquid channel 32, and then passes through the mechanical measuring and adjusting part to enter the electric control module, and the injection amount is adjusted through the control of the electric control module. When the electric control injection module fails, the downreadable concentric measuring and adjusting instrument is downhole, and the interface on the mechanical measuring and adjusting part is connected to drive the related transmission mechanism on the mechanical measuring and adjusting part to act. Two interlocked plunger valves are installed on the mechanical measuring and adjusting part, which can realize the closing of the original electric control injection channel during the action process, and eliminate the influence of the injection channel on the subsequent mechanical measuring and adjusting part on the accurate adjustment of the injection amount. Another injection channel on the mechanical measuring and adjusting part can realize the accurate adjustment of the injection amount of the layer under the control of the external downreadable measuring and adjusting instrument.

Claims

1. A mechanical control mechanism for a downhole dual-control injection device, characterized in that: The mechanical measurement and adjustment part (18) is located above the electronic control module. The outer walls of the two ends of the mechanical measurement and adjustment part (18) are connected to outer tubes A (1) and B (17). A mounting base (2) and an end cap (9) are installed in the outer tube A (1) from top to bottom. The end cap (9) abuts against the upper surface of the mechanical measurement and adjustment part (18). A central channel (28) is eccentrically arranged inside the mounting base (2), the end cap (9) and the mechanical measurement and adjustment part (18). The mounting base (2), end cap (9), and mechanical adjustment part body (18) on the outside are also provided with an installation channel (29) and an electronically controlled liquid inlet channel (32). The upper end of the installation channel (29) is connected to the central channel (28), and at the same time, it is connected to the electronically controlled liquid inlet channel (30) through the electronically controlled liquid inlet (25) on the mounting base (2). The end of the electronically controlled liquid inlet channel (30) is connected to the electronic control module. The end of the installation channel (28) is sealed by a plug (14). The upper mechanical adjustment part body (18) is also provided with a mechanical control liquid inlet (27) to connect the central channel (28) and the installation channel (29). The outer wall of the mechanical adjustment part body (18) above the mechanical control liquid inlet (27) is also provided with a mechanical control liquid outlet (26) to connect with the installation channel (29). A driven gear (8) is provided in the middle of the installation channel (28). Trapezoidal threaded transmission screws are fixedly connected to the upper and lower end faces of the driven gear (8). 4) Two trapezoidal threaded drive screws (4) are connected to piston A (3) and piston B (13). The middle of the central channel (28) is provided with an installation chamber. The installation chamber is provided with a drive sleeve (22) and a drive gear (20) nested together. The drive gear (20) meshes with the driven gear (8). Multiple drive grooves (24) are evenly distributed on the circumference of the drive sleeve (22). Multiple anti-rotation grooves (23) are evenly distributed on the circumference of the mounting seat (2) at the upper end of the central channel (28).

2. The mechanical control mechanism for a downhole dual-control injection device according to claim 1, characterized in that: The outer periphery of the mechanical measurement and adjustment part body (18) is a stepped structure, with the outer diameter in the middle being larger than the outer diameters at the upper and lower ends. The upper and lower ends of the outer periphery of the mechanical measurement and adjustment part body (18) are threadedly connected to the inner holes of the outer tube A (1) and the outer tube B (17), respectively. The end of the installation channel (29) on the mechanical measurement and adjustment part body (18) is threadedly connected to a plug (14).

3. The mechanical control mechanism for a downhole dual-control injection device according to claim 1, characterized in that: The driven gear (8) has an outwardly extending mounting part on its upper and lower end faces. The transmission screw (4) is fixed on the mounting part by a fixing screw (5). The mounting part is also fitted with a bushing A (6) and a thrust bearing (7).

4. The mechanical control mechanism for a downhole dual-control injection device according to claim 1, characterized in that: The drive sleeve (22), the driving gear (20), and the driven gear (8) are fixedly installed inside the mounting base (2) by the end cover (9), and the end cover (9) is fixed together with the mounting base (2) by the connecting screw (19).

5. The mechanical control mechanism for a downhole dual-control injection device according to claim 1, characterized in that: The mounting base (2) is fixedly connected to the mechanical measurement and adjustment part body (18) by fixing bolts (15).

6. The mechanical control mechanism for a downhole dual-control injection device according to claim 1, characterized in that: A ceramic water nozzle (12) is installed at the mechanical control outlet (26) of the installation channel (29). The end of the ceramic water nozzle (12) abuts against the main body (18) of the mechanical adjustment part. A sealing seat (11) is provided at the upper end of the ceramic water nozzle (12). The ceramic water nozzle (12) and the sealing seat (11) are sleeved on the outer periphery of the piston B (13).

7. The mechanical control mechanism for a downhole dual-control injection device according to claim 1, characterized in that: A guide sleeve (10) is provided in the mounting channel (29) below the driven gear (8). The guide sleeve (10) and the inner wall of the mounting channel (29) of the mounting base (2) are both provided with a sliding groove (30). The outer periphery of piston A (3) and piston B (13) are both provided with an outwardly protruding guide part (31), which is inserted into the sliding groove (30).

8. The mechanical control mechanism for a downhole dual-control injection device according to claim 1, characterized in that: A bushing B (21) is provided on the outer periphery of the drive gear (20).

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