Electric control type intelligent grading well cementation tool

Abstract

The invention belongs to the field of oil and gas well cementation tools, particularly relates to an electric control type intelligent grading well cementation tool, and aims to solve the problems that in the prior art, rubber plug accessories cannot be prevented from being drilled and removed, and pipe column pressure testing cannot be carried out before differential pressure type grading hoop construction. The device comprises a body, a closing sleeve, a circulating hole, a pressure balance valve, a transmission mechanism and a driving mechanism, the closing sleeve is coaxially arranged in the body, moves along the body and is used for shielding or exposing the circulating hole, and the circulating hole is formed in the outer circumferential surface of the body; the closing sleeve is in transmission connection with the transmission mechanism, the transmission mechanism is in driving connection with the driving mechanism, and the pressure balance valve is detachably fixed to the body. Opening and closing of the grading cementing device are achieved in an intelligent control mode, meanwhile, the auxiliary closing mechanism is designed, and when intelligent control closing is not tight, the grading hoop can be closed through the auxiliary closing mechanism.

Description

Technical Field

[0001] The invention belongs to the field of petroleum and natural gas cementing tools, and in particular relates to an electrically controlled intelligent graded cementing tool. Background Art

[0002] At present, the staged cementing technology is widely used in multi-stage cementing construction, which can not only avoid the leakage layer, but also avoid the risk of leakage formation and premature solidification of cement slurry caused by too long return height. The commonly used mechanical staged cementing device needs to be opened with opening accessories, and the closing tool is also needed when closing. Once the tool is not properly combined, opening or closing abnormalities often occur.

[0003] Although the differential pressure grading collar can be opened by wellhead pressure, it needs to be closed by using a closing tool, and the fluctuation of wellbore pressure can easily cause the grading collar to open prematurely. Whether it is mechanical or hydraulic grading collar, it is impossible to avoid drilling out the rubber plug accessories, and the pressure test of the pipe string cannot be carried out before the construction of the differential pressure grading collar.

[0004] Based on this, the present invention provides an electrically controlled intelligent graded cementing tool. Summary of the invention

[0005] In order to solve the above-mentioned problems in the prior art, that is, the prior art cannot avoid drilling out the rubber plug accessories, and the problem that the pipe string pressure test cannot be performed before the construction of the pressure differential grading collar, the present invention provides an electrically controlled intelligent grading cementing tool, which includes a body, a closing sleeve, a circulation hole, a pressure balance valve, a transmission mechanism, and a driving mechanism;

[0006] The two ends of the body are detachably fixedly connected to the connecting sleeve, the closing sleeve is coaxially arranged inside the body and moves along the body to cover or expose the circulation hole, and the circulation hole is opened on the outer circumferential surface of the body;

[0007] The closing sleeve is in transmission connection with the transmission mechanism, and the transmission mechanism is used to drive the closing sleeve to move along the axial direction of the body;

[0008] The transmission mechanism is drivingly connected to the driving mechanism, the driving mechanism is used to provide power for the transmission mechanism, and the driving mechanism is fixed to the body;

[0009] The pressure balancing valve is detachably fixed to the body, and the pressure balancing valve is used to maintain the axial pressure balance of the closing sleeve.

[0010] In some preferred embodiments, the transmission mechanism includes a transmission shaft, a gear transmission sleeve, a gear, a gearbox, a first transmission shaft, a key and a keyway;

[0011] The closing sleeve is coaxially fixed to the transmission shaft, the transmission shaft is spirally meshed with the gear transmission sleeve, the gear transmission sleeve is coaxially fixed to the gear, the gear is coaxially fixed to the output shaft of the gearbox, the input shaft of the gearbox is coaxially fixed to the first transmission shaft, and the first transmission shaft is drivingly connected to the driving mechanism;

[0012] A key is fixed on the outer circumferential surface of the transmission shaft. The key is arranged in a key slot and moves along the key slot. The key slot is provided on the driving mechanism.

[0013] In some preferred embodiments, the drive mechanism includes a motor and a control assembly;

[0014] The output shaft of the motor is coaxially fixed with the first transmission shaft, and the motor is fixed with the body and the control assembly;

[0015] A power supply and a control system are fixed inside the control assembly, and both the power supply and the control system are electrically connected to the motor. The power supply is used to supply power to the motor, and the control system is used to control the rotation direction of the output shaft of the motor. The outer circumferential surface of the control assembly is threadedly connected to the inner circumferential surface of the body.

[0016] The keyway is provided on the outer circumferential surface of the motor.

[0017] In some preferred embodiments, at least one pressure balancing hole is evenly arranged on the outer circumferential surface of the body, and the pressure balancing hole is used to balance the pressure.

[0018] In some preferred embodiments, at least one group of circulation holes are evenly arranged along the outer circumferential surface of the body.

[0019] In some preferred embodiments, a sealing ring is provided between the closing sleeve and the body for sealing.

[0020] In some preferred embodiments, a first sealing mechanism is provided between the pressure balancing valve and the body; a first sealing mechanism is provided between the pressure balancing valve and the transmission shaft; the first sealing mechanism and the second sealing mechanism are used to achieve sealing between the pressure balancing valve, the body and the transmission shaft.

[0021] In some preferred embodiments, the control assembly and the body are limited by a retaining ring.

[0022] In some preferred embodiments, a third sealing mechanism is provided between the control assembly and the body to achieve a sealed connection.

[0023] In some preferred embodiments, a fourth sealing mechanism is provided between the control assembly and the transmission shaft for achieving a sealed connection.

[0024] Beneficial effects of the present invention:

[0025] The electronically controlled intelligent graded cementing tool of the invention integrates pressure control, signal control and mechanical control parts, realizes the opening and closing of the graded cementing device by intelligent control, and designs an auxiliary closing mechanism, that is, when the intelligent control is not closed tightly, the graded hoop can be closed by the auxiliary closing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0027] Figure 1 It is a schematic diagram of the internal structure of an electrically controlled intelligent graded cementing tool of the present invention;

[0028] Figure 2 yes Figure 1 A partial enlarged view of . DETAILED DESCRIPTION

[0029] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the relevant invention are shown in the accompanying drawings.

[0030] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] like Figure 1 As shown, the present invention provides an electrically controlled intelligent staged cementing tool, which includes a body 1, a closing sleeve 2, a circulation hole 1-1, a pressure balance valve 4, a transmission mechanism, and a driving mechanism;

[0032] The two ends of the body 1 are detachably fixedly connected to the connecting sleeves, the closing sleeve 2 is coaxially arranged inside the body 1 and moves along the body 1 to cover or expose the circulation hole 1-1, and the circulation hole 1-1 is opened on the outer circumferential surface of the body 1;

[0033] The closing sleeve 2 is in transmission connection with the transmission mechanism, and the transmission mechanism is used to drive the closing sleeve 2 to move along the axial direction of the body 1;

[0034] The transmission mechanism is drivingly connected to the driving mechanism, the driving mechanism is used to provide power for the transmission mechanism, and the driving mechanism is fixed to the body 1;

[0035] The pressure balancing valve 4 is detachably fixed to the body 1 , and the pressure balancing valve 4 is used to maintain the axial pressure balance of the closing sleeve 2 .

[0036] The method of "the two ends of the main body 1 are detachably fixedly connected to the connecting sleeve" is that threaded holes are provided at the two ends of the main body 1, and the two ends of the main body 1 are detachably fixedly connected to the connecting sleeve through the threaded holes.

[0037] The manner in which “the pressure balancing valve 4 and the body 1 are detachably fixed” is: threaded connection and fixing.

[0038] Among them, one end of the closing sleeve 2 contacts with the step of the body 1, and the step is the axial downward limit position of the closing sleeve 2. The step is Figure 1 The lower end surface of the middle closing sleeve 2 contacts the step surface.

[0039] Among them, under the action of the pressure balance valve 4, the axial pressure of the closing sleeve 2 is always in a balanced state, and no axial force caused by pressure difference is generated on other parts of the tool.

[0040] Among them, the equivalent diameter of the circulation hole 2 is not less than the minimum diameter of the tool, and the circulation holes 2 are evenly distributed around the circumference.

[0041] Before the tool is started, the pipe string connected to the tool can be pressurized to verify the sealing integrity of the pipe string, but the pressurization pressure is allowed to be lower than the start-up pressure.

[0042] For further explanation of the present invention, see Figure 1 , Figure 2 , the transmission mechanism includes a transmission shaft 3, a gear transmission sleeve 5, a gear 6, a gearbox 7, a first transmission shaft 8, a key 3-1 and a keyway 9-1;

[0043] The closing sleeve 2 is coaxially fixed with the transmission shaft 3, the transmission shaft 3 is spirally meshed with the gear transmission sleeve 5, the gear transmission sleeve 5 is coaxially fixed with the gear 6, the gear 6 is coaxially fixed with the output shaft of the gearbox 7, the input shaft of the gearbox 7 is coaxially fixed with the first transmission shaft 8, and the first transmission shaft 8 is drivingly connected with the driving mechanism;

[0044] A key 3 - 1 is fixed to the outer circumferential surface of the transmission shaft 3 , and the key 3 - 1 is arranged in a key slot 9 - 1 and moves along the key slot 9 - 1 , and the key slot 9 - 1 is provided on the driving mechanism.

[0045] The transmission shaft 3 is a spiral transmission shaft, and the other end of the closing sleeve 2 is fixed to the transmission shaft 3 through a shear pin 2-3.

[0046] The manner in which “the gear 6 is coaxially fixed with the output shaft of the gearbox 7” is as follows: the gear 6 is coaxially fixed with the output shaft of the gearbox 7 via the second transmission shaft 6 - 1 .

[0047] For further explanation of the present invention, see Figure 1 , Figure 2 , the driving mechanism includes a motor 9 and a control assembly 10;

[0048] The output shaft of the motor 9 is coaxially fixed with the first transmission shaft 8, and the motor 9 is fixed with the body 1 and the control assembly 10;

[0049] A power supply 10-1 and a control system 10-3 are fixed in the control assembly 10, and the power supply 10-1 and the control system 10-3 are both electrically connected to the motor 9. The power supply 10-1 is used to supply power to the motor 9, and the control system 10-3 is used to control the rotation direction of the output shaft of the motor 9; the outer circumferential surface of the control assembly 10 is threadedly connected to the inner circumferential surface of the body 1;

[0050] The keyway 9 - 1 is provided on the outer circumferential surface of the motor 9 .

[0051] The key 3-1 and the key slot 9-1 are provided for relative rotation between the transmission shaft 3 and the motor 9. The key 3-1 and the transmission shaft 3 are an integrated structure, and its outer surface is an arc, and the inner surface of the key slot 9-1 is an arc concentric with the key 3-1. The key 3-1 on the transmission shaft 3 can move axially along the key slot 9-1, and its stroke is greater than the axial movement stroke of the closing sleeve 2. The initial position of the key 3-1 is located at the lower end of the key slot 9-1, and the end surfaces of the two are flush.

[0052] Among them, the method of "the motor 9 is fixed to the main body 1 and the control assembly 10" is: the motor 9 and the control assembly 10 are designed inside the main body 1 and are fixed together by bolts 10-2 evenly distributed around the circumference.

[0053] Wherein, the power source 10 - 1 is a battery combination evenly distributed in a ring shape.

[0054] For further explanation of the present invention, see Figure 1 At least one pressure balance hole 2-4 is evenly arranged on the outer circumferential surface of the main body 1, and the pressure balance hole 2-4 is used to balance the pressure.

[0055] The pressure balancing valve 4 is fixed to the body 1 by threaded connection and then a bore 2 - 4 is provided to transmit the external liquid pressure to the upper end surface of the closing sleeve 2 to maintain the axial pressure balance of the closing sleeve 2 .

[0056] For further explanation of the present invention, see Figure 1 At least one group of circulation holes 1 - 1 is evenly arranged along the outer circumferential surface of the main body 1 .

[0057] For further explanation of the present invention, see Figure 1 A sealing ring 2-1 is provided between the closing sleeve 2 and the body 1 for sealing.

[0058] For further explanation of the present invention, see Figure 1 A first sealing mechanism 4-1 is provided between the pressure balancing valve 4 and the main body 1; a first sealing mechanism 4-2 is provided between the pressure balancing valve 4 and the transmission shaft 3; the first sealing mechanism 4-1 and the second sealing mechanism 4-2 are used to achieve sealing between the pressure balancing valve 4 and the main body 1 and the transmission shaft 3.

[0059] For further explanation of the present invention, see Figure 1 The control assembly 10 and the main body 1 are limited by a retaining ring 12.

[0060] For further explanation of the present invention, see Figure 1 A third sealing mechanism 11 is provided between the control assembly 10 and the body 1 for achieving a sealed connection.

[0001] For further explanation of the present invention, see Figure 1 A fourth sealing mechanism 13 is provided between the control assembly 10 and the transmission shaft 3 for achieving a sealed connection.

[0002] See also Figure 1 During the use of the present invention, when it is necessary to open the graded cementing device, the wellbore is pressurized to the preset pressure of the controller. After the sensor in the control system 10-3 receives the set pressure signal, the control system connects the forward rotation circuit of the motor 9 to make the motor 9 rotate forward, and at the same time drives the first transmission shaft 8, the second transmission shaft 6-1, the gearbox 7, the gear 6, the gear transmission sleeve 5, and the transmission shaft 3 to work, and the closing sleeve 2 moves upward to expose the circulation hole 1-1. When the closing sleeve 2 reaches the upper limit position, the sensor of the control assembly 10 will receive the axial tension signal. At the same time, the control system 10-3 turns off the power supply 10-1 and the motor 9 stops.

[0003] When it is necessary to close the graded cement injector, the electronic tag is inserted. After the control system 10-3 signal processor receives the electronic signal carried by the electronic tag, the controller connects the motor reversing circuit to reverse the motor 9, and at the same time drives the first transmission shaft 8, the second transmission shaft 6-1, the gearbox 7, the gear 6, the gear transmission sleeve 5, and the transmission shaft 3 to work. When the closing sleeve 2 closes the circulation hole 1-1 and reaches the extreme lower limit position, the control assembly 10 sensor will receive the axial pressure signal. At the same time, the control system 10-3 turns off the power and the motor stops.

[0001] When the closing sleeve 2 fails to close, an auxiliary tool can be put in to press and shear the shear pin 2-3, and the closing sleeve 2 goes down to close the circulation hole 1-1. The auxiliary tool can be a cementing plug.

[0002] The terms "first", "second", etc. are used to distinguish similar objects rather than to describe or indicate a particular order or sequence.

[0003] The term "comprise" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus / device.

[0004] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An electrically controlled intelligent graded cementing tool, characterized in that: The tool comprises a body (1), a closing sleeve (2), a circulation hole (1-1), a pressure balance valve (4), a transmission mechanism, and a driving mechanism; The two ends of the body (1) are detachably fixedly connected to the connecting sleeve, the closing sleeve (2) is coaxially arranged inside the body (1) and moves along the body (1) to cover or expose the circulation hole (1-1), and the circulation hole (1-1) is opened on the outer circumferential surface of the body (1); The closing sleeve (2) is in transmission connection with the transmission mechanism, and the transmission mechanism is used to drive the closing sleeve (2) to move along the axial direction of the body (1); The transmission mechanism is drivingly connected to the drive mechanism, the drive mechanism is used to provide power for the transmission mechanism, and the drive mechanism is fixed to the body (1); The pressure balancing valve (4) is detachably fixed to the body (1), and the pressure balancing valve (4) is used to maintain the axial pressure balance of the closing sleeve (2).

2. The electrically controlled intelligent staged cementing tool according to claim 1, characterized in that: The transmission mechanism comprises a transmission shaft (3), a gear transmission sleeve (5), a gear (6), a gearbox (7), a first transmission shaft (8), a key (3-1) and a keyway (9-1); The closing sleeve (2) is coaxially fixed to the transmission shaft (3), the transmission shaft (3) is spirally meshed with the gear transmission sleeve (5), the gear transmission sleeve (5) is coaxially fixed to the gear (6), the gear (6) is coaxially fixed to the output shaft of the gearbox (7), the input shaft of the gearbox (7) is coaxially fixed to the first transmission shaft (8), and the first transmission shaft (8) is drivingly connected to the driving mechanism; A key (3-1) is fixed on the outer circumferential surface of the transmission shaft (3); the key (3-1) is arranged in a key slot (9-1) and moves along the key slot; and the key slot (9-1) is provided on the driving mechanism.

3. The electrically controlled intelligent staged cementing tool according to claim 2, characterized in that: The driving mechanism comprises a motor (9) and a control assembly (10); The output shaft of the motor (9) is coaxially fixed to the first transmission shaft (8), and the motor (9) is fixed to the body (1) and the control assembly (10); A power source (10-1) and a control system (10-3) are fixed in the control assembly (10); the power source (10-1) and the control system (10-3) are both electrically connected to the motor (9); the power source (10-1) is used to supply power to the motor (9); and the control system (10-3) is used to control the rotation direction of the output shaft of the motor (9); the outer circumferential surface of the control assembly (10) is threadedly connected to the inner circumferential surface of the body (1); The keyway (9-1) is provided on the outer circumferential surface of the motor (9).

4. The electrically controlled intelligent graded cementing tool according to claim 3, characterized in that: At least one pressure balancing hole (2-4) is evenly arranged on the outer circumferential surface of the body (1), and the pressure balancing hole (2-4) is used for balancing pressure.

5. The electrically controlled intelligent staged cementing tool according to claim 1, characterized in that: At least one group of circulation holes (1-1) is evenly arranged along the outer circumferential surface of the body (1).

6. The electrically controlled intelligent staged cementing tool according to claim 1, characterized in that: A sealing ring (2-1) is provided between the closing sleeve (2) and the main body (1) for sealing.

7. The electrically controlled intelligent staged cementing tool according to claim 2, characterized in that: A first sealing mechanism (4-1) is provided between the pressure balancing valve (4) and the body (1); a first sealing mechanism (4-2) is provided between the pressure balancing valve (4) and the transmission shaft (3); the first sealing mechanism (4-1) and the second sealing mechanism (4-2) are used to achieve sealing between the pressure balancing valve (4), the body (1) and the transmission shaft (3).

8. The electrically controlled intelligent staged cementing tool according to claim 3, characterized in that: The control assembly (10) and the main body (1) are limited by a retaining ring (12).

9. The electrically controlled intelligent staged cementing tool according to claim 8, characterized in that: A third sealing mechanism (11) is provided between the control assembly (10) and the body (1) for achieving a sealed connection.

10. The electrically controlled intelligent staged cementing tool according to claim 9, characterized in that: A fourth sealing mechanism (13) is provided between the control assembly (10) and the transmission shaft (3) for achieving a sealed connection.

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