Mechanical switch unlocking device of stratum isolation valve

Abstract

The invention relates to the technical field of well completion equipment, and discloses a mechanical switch unlocking device of a stratum isolation valve, which comprises an upper sleeve, a lower sleeve and a ratchet wheel cylinder, the ratchet wheel cylinder is provided with a ratchet wheel groove position, a rotating pin sleeve is axially and fixedly arranged between the lower sleeve and the ratchet wheel cylinder, and a sliding pin is arranged on the rotating pin sleeve. The sliding pin is arranged in the ratchet wheel groove in a penetrating mode. The ratchet wheel groove position comprises an upper groove, a lower groove and an unlocking groove, an upper guide-in inclined face is arranged between the upper groove, a lower guide-in inclined face is arranged between the lower groove, the ratchet wheel cylinder reciprocates up and down, so that the sliding pin reciprocates between the upper groove and the lower groove for transposition, and when the sliding pin is shifted to the unlocking groove, the ratchet wheel cylinder moves downwards for transmission. The mechanical switch unlocking device of the stratum isolation valve has the advantages of being simple in structure, good in operation stability, safe and reliable, and can stably cope with the complex underground working environment.

Description

Technical Field

[0001] The invention relates to the technical field of well completion equipment, and in particular to a mechanical switch unlocking device of a formation isolation valve. Background Art

[0002] At present, there are many complex fault-block oil reservoirs in the Beibu Gulf Basin, and abnormally high-pressure systems are common, which faces severe well control safety risks. The existing downhole tool transmission mechanisms on the market are mainly composed of actuator springs, one-way actuator rods and rupture disks. However, the formation pressure coefficient range is large, and the springs are unreliable. There is a risk of premature unlocking or failure to unlock when using the above-mentioned mechanisms. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a mechanical switch unlocking device for a formation isolation valve which has a simple structure, good operating stability, is safe and reliable, and can stably cope with complex underground working environments.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: A mechanical switch unlocking device for a formation isolation valve, comprising an upper casing and a lower casing connected to each other, wherein a ratchet cylinder is arranged in the inner space after the upper casing and the lower casing are fixedly connected, a ratchet slot is arranged on the ratchet cylinder, a rotating pin sleeve is axially fixedly arranged between the lower casing and the ratchet cylinder, the rotating pin sleeve is located at the outer periphery of the ratchet slot, a sliding pin is arranged on the rotating pin sleeve, and the sliding pin is inserted into the ratchet slot; The ratchet slot includes an upper groove, a lower groove and an unlocking groove. An upper guide slope is provided between any two adjacent groups of upper grooves, and a lower guide slope is provided between any two adjacent groups of lower grooves. The ratchet cylinder reciprocates up and down, so that the sliding pin reciprocates and changes position between the upper groove and the lower groove, driving the rotating pin sleeve to rotate. When the sliding pin changes position to the unlocking groove, the ratchet cylinder moves downward for transmission.

[0005] As a further improvement of the above technical solution: An anti-rotation pin is arranged on the upper sleeve, and the anti-rotation pin is passed through the unlocking groove.

[0006] The number of groups of the sliding pins, the unlocking grooves and the anti-rotation pins is set to two, and the two groups of sliding pins are arranged relative to each other at 180°, the two groups of unlocking grooves are arranged relative to each other at 180°, and the two groups of anti-rotation pins are arranged relative to each other at 180°.

[0007] The lower end of the upper sleeve is threadedly connected to the inner part of the upper end of the lower sleeve.

[0008] The inner wall of the lower sleeve is provided with a step portion for supporting the rotating pin sleeve, and the lower end of the upper sleeve abuts against the rotating pin sleeve so that the rotating pin sleeve is axially fixed in the lower sleeve.

[0009] Compared with the prior art, the advantages of the present invention are: The mechanical switch unlocking device of the formation isolation valve of the present invention comprises an upper casing, a lower casing and a ratchet cylinder, wherein a ratchet groove is provided on the ratchet cylinder, a rotating pin sleeve is provided between the lower casing and the ratchet cylinder, and a sliding pin on the rotating pin sleeve is penetrated in the ratchet groove. By lifting and lowering the ratchet cylinder, during the reciprocating motion of the ratchet cylinder, the sliding pin can reciprocate in the ratchet groove to achieve position change, and finally reach the unlocking groove. The lowering depth of the ratchet cylinder is increased to achieve transmission connection with the downhole tool. The mechanical structure transmission of the ratchet groove is adopted to replace the scheme with unreliable spring factors in the prior art, and the function of reciprocating movement of the sliding pin in the ratchet groove for position change and unlocking transmission is realized. The structure is simple, the operation stability is good, and the safety and reliability are good, and the sliding pin can stably cope with the complex working environment such as pressure and temperature in the downhole. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the cross-sectional structure of the mechanical switch unlocking device of the formation isolation valve.

[0011] Figure 2 Enlarged cross-sectional detail of the rotating pin bushing and sliding pin.

[0012] Figure 3 Schematic diagram of the disassembly of the internal structure of the upper casing and the lower casing.

[0013] Figure 4 A detailed enlarged view of the ratchet slot.

[0014] Figure 5 It is a schematic diagram of the half-section structure of the upper casing and the rotating pin sleeve.

[0015] Legend: 1. Upper sleeve; 2. Lower sleeve; 201. Step portion; 3. Ratchet cylinder; 4. Ratchet slot; 401. Upper groove; 402. Lower groove; 403. Unlocking groove; 404. Upper guide slope; 405. Lower guide slope; 5. Rotating pin sleeve; 6. Sliding pin; 7. Anti-rotation pin. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] like Figures 1 to 5As shown, the mechanical switch unlocking device of the formation isolation valve of this embodiment comprises an upper casing 1 and a lower casing 2 connected to each other, a ratchet cylinder 3 is arranged in the internal space after the upper casing 1 and the lower casing 2 are fixedly connected, a ratchet groove 4 is opened on the ratchet cylinder 3, a rotating pin sleeve 5 is axially fixedly arranged between the lower casing 2 and the ratchet cylinder 3, the rotating pin sleeve 5 is located at the outer periphery of the ratchet groove 4, a sliding pin 6 is arranged on the rotating pin sleeve 5, and the sliding pin 6 is penetrated in the ratchet groove 4; the ratchet groove Position 4 includes an upper groove 401, a lower groove 402 and an unlocking groove 403. An upper guide slope 404 is provided between any two adjacent groups of upper grooves 401, and a lower guide slope 405 is provided between any two adjacent groups of lower grooves 402. The ratchet cylinder 3 reciprocates up and down, so that the sliding pin 6 reciprocates and changes position between the upper groove 401 and the lower groove 402, driving the rotating pin sleeve 5 to rotate. When the sliding pin 6 changes position to the unlocking groove 403, the ratchet cylinder 3 moves downward for transmission. The mechanical switch unlocking device of the formation isolation valve comprises an upper casing 1, a lower casing 2 and a ratchet cylinder 3, wherein a ratchet slot 4 is provided on the ratchet cylinder 3, a rotating pin sleeve 5 is provided between the lower casing 2 and the ratchet cylinder 3, and a sliding pin 6 on the rotating pin sleeve 5 is penetrated in the ratchet slot 4. By lifting and lowering the ratchet cylinder 3, during the reciprocating motion of the ratchet cylinder 3, the sliding pin 6 can reciprocate in the ratchet slot 4 to achieve position change, and finally reach the unlocking groove 403. The lowering depth of the ratchet cylinder 3 is increased to achieve transmission connection with the downhole tool. The mechanical structure transmission of the ratchet slot 4 is adopted to replace the scheme with unreliable spring factors in the prior art, so as to realize the function of reciprocating movement and position change of the sliding pin 6 in the ratchet slot 4 and unlocking transmission. The structure is simple, the operation stability is good, and the safety and reliability are good. The sliding pin 6 can stably cope with the complex working environment such as pressure and temperature in the downhole.

[0018] Preferably, an anti-rotation pin 7 is provided on the upper sleeve 1, and the anti-rotation pin 7 is inserted into the unlocking groove 403. Figure 4 As shown, the unlocking groove 403 is longer in the vertical direction, and the anti-rotation pin 7 is inserted into the unlocking groove 403. When the ratchet cylinder 3 moves up and down, the anti-rotation pin 7 always moves up and down relatively along the unlocking groove 403. The ratchet cylinder 3 does not provide a rotational torque for the anti-rotation pin 7, so the upper sleeve 1 and the ratchet cylinder 3 remain circumferentially fixed.

[0019] Preferably, the number of groups of sliding pins 6, unlocking grooves 403 and anti-rotation pins 7 is set to two groups, and the two groups of sliding pins 6 are arranged 180° relative to each other, the two groups of unlocking grooves 403 are arranged 180° relative to each other, and the two groups of anti-rotation pins 7 are arranged 180° relative to each other.

[0020] Preferably, the lower end of the upper casing 1 is threadedly connected to the upper end of the lower casing 2. In this embodiment, the upper casing 1 and the lower casing 2 are connected by mutual engagement of the threads, which has the advantages of high reliability, good seismic performance, convenient and quick assembly and disassembly, can withstand large tensile and shear forces, and adapt to the complex working environment of pressure, temperature, etc. in the well.

[0021] Preferably, the inner wall of the lower sleeve 2 is provided with a step portion 201 for supporting the rotating pin sleeve 5, and the lower end of the upper sleeve 1 abuts against the rotating pin sleeve 5, so that the rotating pin sleeve 5 is axially fixed in the lower sleeve 2. In this embodiment, the upper sleeve 1 is threadedly connected to the lower sleeve 2, so the lower sleeve 2 is also circumferentially fixed with the ratchet cylinder 3, and the rotating pin sleeve 5 and the ratchet cylinder 3 are clearance-matched. When the ratchet cylinder 3 reciprocates up and down, the sliding pin 6 on the rotating pin sleeve 5 will abut and slide with the upper guide inclined surface 404 and the lower guide inclined surface 405, which can provide a rotational torque for the sliding pin 6, thereby driving the rotating pin sleeve 5 to rotate on the step portion 201. When the sliding pin 6 is shifted to the unlocking groove 403, the anti-rotation pin 7 and the sliding pin 6 will overlap in the vertical direction (such as Figure 5 As shown), at this time, the ratchet cylinder 3 is lowered, so that the downward movement depth of the ratchet cylinder 3 increases, and the lower end of the ratchet cylinder 3 is connected to the downhole tool in a transmission manner.

[0022] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. For those skilled in the art, improvements and changes obtained without departing from the technical concept of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A mechanical switch unlocking device for a formation isolation valve, characterized in that: The invention comprises an upper sleeve (1) and a lower sleeve (2) connected to each other, wherein a ratchet cylinder (3) is arranged in the internal space after the upper sleeve (1) and the lower sleeve (2) are fixedly connected, and a ratchet slot (4) is provided on the ratchet cylinder (3), and a rotating pin sleeve (5) is axially fixedly arranged between the lower sleeve (2) and the ratchet cylinder (3), and the rotating pin sleeve (5) is located on the outer periphery of the ratchet slot (4), and a sliding pin (6) is arranged on the rotating pin sleeve (5), and the sliding pin (6) is inserted into the ratchet slot (4); The ratchet slot (4) comprises an upper groove (401), a lower groove (402) and an unlocking groove (403); an upper guide slope (404) is provided between any two adjacent groups of upper grooves (401); a lower guide slope (405) is provided between any two adjacent groups of lower grooves (402); the ratchet cylinder (3) reciprocates up and down, causing the sliding pin (6) to reciprocate and shift between the upper groove (401) and the lower groove (402), driving the rotating pin sleeve (5) to rotate; when the sliding pin (6) shifts to the unlocking groove (403), the ratchet cylinder (3) moves downward for transmission.

2. The mechanical switch unlocking device of the formation isolation valve according to claim 1 is characterized in that: An anti-rotation pin (7) is provided on the upper sleeve (1), and the anti-rotation pin (7) is inserted into the unlocking groove (403).

3. The mechanical switch unlocking device of the formation isolation valve according to claim 2 is characterized in that: The number of groups of the sliding pins (6), the unlocking grooves (403) and the anti-rotation pins (7) is set to two, and the two groups of sliding pins (6) are arranged relative to each other at 180 degrees, the two groups of unlocking grooves (403) are arranged relative to each other at 180 degrees, and the two groups of anti-rotation pins (7) are arranged relative to each other at 180 degrees.

4. The mechanical switch unlocking device of the formation isolation valve according to claim 3 is characterized in that: The lower end of the upper sleeve (1) is threadedly connected to the interior of the upper end of the lower sleeve (2).

5. The mechanical switch unlocking device of the formation isolation valve according to claim 4 is characterized in that: The inner wall of the lower sleeve (2) is provided with a step portion (201) for supporting the rotating pin sleeve (5), and the lower end of the upper sleeve (1) abuts against the rotating pin sleeve (5) so that the rotating pin sleeve (5) is axially fixed in the lower sleeve (2).

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