Dissolution control delay repeatable pressure test fracturing valve

Abstract

The utility model belongs to the technical field of oil field fracturing, and particularly relates to a dissolution control delay repeatable pressure test fracturing valve which comprises a sliding sleeve, the sliding sleeve is composed of an upper connector, a sleeve and a lower connector, a shearing ring is arranged in the lower connector, a first mounting hole is formed in the surface of the shearing ring, and a second mounting hole is formed in the surface of the sleeve. A first mounting hole is formed in the sliding sleeve, a shear pin is arranged in the first mounting hole, a mandrel is inserted into one end of the shear pin, a piston is in threaded connection with one end of the mandrel, and a delayed fracturing assembly is mounted in the sliding sleeve. According to the utility model, on the basis that the device is opened after the delay pressure test time is controlled only by dissolving in the earlier stage, the functions of secondary pressure test and opening pressure control through the adjustable pin are added, the device has the function of testing the high-pressure sealing performance of the oil pipe, the functions of pressure test and fracturing are integrated, and the construction risk of a project is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to oilfield fracturing technical field, concretely is a kind of dissolving control delay repeatable pressure test fracturing valve. BACKGROUND

[0002] In oilfield development, in order to improve the flow environment of oil in the ground, so that oil well production increases, generally need to carry out fracturing operation, oilfield fracturing wants to test pressure mainly to ensure safety and construction effect. In the fracturing process, high pressure will be used to inject fracturing fluid into formation, test pressure can check the sealing property and integrity of equipment and oil casing in advance, prevent the safety accident caused by equipment or oil pipe rupture, leakage during construction, like avoiding high-pressure liquid jet injury personnel and equipment, also avoid working fluid leakage to cause formation damage.

[0003] At present, the operation site construction pipe column is checked for the sealing performance in oil casing, and two methods are adopted: the first method is to lower the conventional pressure opening valve, and directly test pressure on the construction pipe column, but the test pressure is limited by the conventional pressure opening valve in the well, and the test pressure is usually lower than the pressure resistance of the pipe column, and the second method is not to lower the pressure opening valve, and directly test pressure on the site pipe column, after test pressure is qualified, lower the perforating pipe column at the bottom end of the original pipe column, and carry out perforation, after perforation, the perforating pipe column is lifted, and then subsequent fracturing operation is carried out.

[0004] The first defect of the two checking methods is that the test pressure is usually lower than the pressure resistance of the pipe column, and the pressure limit of the pipe column cannot be completely tested, and the second method needs to increase the number of downhole pipe column, and the labor intensity of the site worker is increased, and the increase of the number of downhole also increases the construction risk of various uncertainties. UTILITY MODEL CONTENT

[0005] In order to make up for the deficiency of prior art, solve the technical problems proposed above, the utility model provides a kind of dissolving control delay repeatable pressure test fracturing valve.

[0006] The utility model discloses a kind of dissolved control delay repeatable pressure test fracturing valves, including sliding sleeve, the sliding sleeve is composed of upper joint, sleeve and lower joint, the inside of the sleeve is provided with shear ring, the surface of the shear ring is provided with mounting hole one, the inside of the mounting hole one is provided with shear pin, the one end of the shear pin is inserted with mandrel, the one end of the mandrel is threadedly connected with piston, delay fracturing assembly is installed in the sliding sleeve, and the delay fracturing assembly includes channel, fracturing pressure transmission channel and mounting hole two, the channel is set in the inside of upper joint, the inside of the channel is detachably fixed with rupture disc, dissolution delay piece and pressure transmission plug from inside to outside in sequence, the surface of the pressure transmission plug is provided with pressure transmission hole, the fracturing pressure transmission channel is set on the surface of upper joint, and the fracturing pressure transmission channel is used to establish fluid flow channel between channel and piston, the mounting hole two is set on the surface of sleeve, and the inside of the mounting hole two is detachably fixed with rupture cap.

[0007] Preferably, the opposite end of the upper joint and the sleeve is threadedly connected, the opposite end of the sleeve and the lower joint is threadedly connected, and the end of the lower joint away from the sleeve is tapped to form a male thread, which is used to connect with the oil pipe.

[0008] Preferably, the outside of the piston and the inside of the sleeve form a vacuum cavity.

[0009] Preferably, the rupture disc, the dissolution delay piece and the pressure transmission plug are threadedly connected with the channel respectively, and the rupture cap is threadedly connected with the mounting hole two.

[0010] Preferably, the outer wall of the rupture disc, the dissolution delay piece and the pressure transmission plug is fixedly provided with sealing ring three, sealing ring four and sealing ring five respectively.

[0011] Preferably, the outer wall of the piston is fixedly connected with wear-preventing correction ring one and wear-preventing correction ring two.

[0012] Preferably, the outer wall of the piston is tapped to form back ring one, back ring three and back ring two.

[0013] Preferably, the inside of the back ring one, the back ring three and the back ring two is fixedly provided with sealing ring one, sealing ring six and sealing ring two.

[0014] Preferably, the surface of the sleeve is tapped to form mounting hole three, the outer wall of the lower joint is tapped to form threaded hole, the inside of the mounting hole three is inserted with fixing screw, and the fixing screw is threadedly connected with the threaded hole.

[0015] The utility model has the advantages that:

[0016] 1.The utility model discloses on the basis of opening after the single dissolution control delay pressure test time in the early stage, adds the function of two -stage pressure test and the pin control opening pressure through adjustable, has the function of high -pressure sealing performance test to the oil pipe, integrates pressure test and fracturing function, reduces the operation step, reduces the construction risk of project.

[0017] 2.The utility model discloses simple structure, and the break disc and pin of opening pressure can be adjusted and replaced at any time according to the well condition on the spot, and the sliding sleeve length is short, and the downhole accident risk is low, and easy to handle. ACCURACY

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description only some embodiments of the utility model, for those skilled in the art, under the premise of not paying the creative labor, still can obtain other drawings according to these drawings.

[0019] Fig. 1 is the overall structure schematic diagram of the utility model;

[0020] Fig. 2 is the upper joint local structure schematic diagram of the utility model.

[0021] In the drawing: 1, upper joint;2, sleeve;3, piston;4, lower joint;5, shear ring;6, mandrel;7, break disc;8, dissolution delay piece;9, pressure transmission plug;10, break cap;11, back ring one;12, back ring three;13, back ring two;14, anti -wear correction ring one;15, anti -wear correction ring two;16, shear pin;17, sealing ring one;18, sealing ring;19, sealing ring two;20, sealing ring three;21, sealing ring four;22, sealing ring five;23, fixed screw. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the utility model will be clearly and completely described in the following combined with the drawings in the embodiments of the utility model, obviously, the described embodiments only some embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without making creative labor belong to the range of protection of the utility model.

[0023] Please refer to the shown in figure 1-2, a kind of solution control delay repeatable pressure test fracturing valve, including sliding sleeve, sliding sleeve is by upper connector 1, sleeve 2 and lower connector 4 It is formed, the inside of lower connector 4 is provided with shear ring 5, the surface of shear ring 5 is provided with mounting hole one, the inside of mounting hole one is provided with shear pin 16, one end of shear pin 16 is inserted with mandrel 6, one end of mandrel 6 is threadedly connected with piston 3, sliding sleeve is installed with delay fracturing assembly, delay fracturing assembly includes channel, fracturing pressure transmission channel and mounting hole two, channel is set in the inside of upper connector 1, the inside of channel is sequentially detachably fixed with rupture disc 7, dissolving delay piece 8 and pressure transmission plug 9 from inside to outside, the surface of pressure transmission plug 9 is provided with pressure transmission hole, fracturing pressure transmission channel is set in the surface of upper connector 1, fracturing pressure transmission channel is used to establish fluid flow channel between channel and piston 3, mounting hole two is set in the surface of sleeve 2, the inside of mounting hole two is detachably fixed with rupture cap 10, dissolving delay piece 8 adopts soluble metal material, it needs to be selected according to well condition, downhole temperature, fracturing fluid type etc. Different soluble metal, generally uses soluble magnesium alloy and soluble aluminum alloy material.

[0024] Specifically, shear pin 16 can be replaced according to demand, so as to adjust the opening pressure, the inner diameter of sliding sleeve is consistent with the inner diameter of the casing in the field operation, and piston 3 and mandrel 6 are annular, which ensures that the conventional cementing tool can pass through, shear ring 5 is used to resist lower connector 4, and is inserted with mandrel 6 through shear pin 16, which limits piston 3 and mandrel 6 connected with piston 3, channel is used to install rupture disc 7, dissolving delay piece 8 and pressure transmission plug 9, rupture disc 7 is ruptured by the pressure difference between channel and the inside of rupture disc 7, dissolving delay piece 8 is delayed by the dissolving time of metal in fracturing fluid, when the delay piece is dissolved, pressure transmission hole and fracturing pressure transmission channel are opened, so that the pressure is transmitted to shear pin 16 through piston 3 and mandrel 6, when the pressure is greater than the shear value of shear pin 16, shear pin 16 is broken, piston 3 and mandrel 6 are pushed to move downward, when piston 3 moves to the position, rupture cap 10 is exposed, the pressure acts on the inside of rupture cap 10, when the pressure is greater than the rupture pressure of rupture cap 10, rupture cap 10 is opened, and fracturing is opened.

[0025] The opposite end of upper connector 1 and sleeve 2 is threadedly connected, the opposite end of sleeve 2 and lower connector 4 is threadedly connected, the end of lower connector 4 away from sleeve 2 is threaded and provided with male thread, which is used to connect with oil pipe.

[0026] Specifically, by the way of threaded connection, upper connector 1, sleeve 2 and lower connector 4 can be disassembled and combined.

[0027] The piston 3 and the sleeve 2 form a vacuum cavity.

[0028] Specifically, the piston 3 is used to prevent liquid from flowing between the piston 3 and the sleeve 2.

[0029] The rupture disc 7, the dissolution delay piece 8 and the pressure transmission plug 9 are respectively screwed with the channel, the rupture cap 10 is screwed with the mounting hole two, and the outer walls of the rupture disc 7, the dissolution delay piece 8 and the pressure transmission plug 9 are respectively fixedly provided with the sealing ring three 20, the sealing ring four 21 and the sealing ring five 22.

[0030] Specifically, the rupture disc 7, the dissolution delay piece 8 and the pressure transmission plug 9 can be replaced by screwing after use, realizing the reuse of the device, and the sealing ring three 20, the sealing ring four 21 and the sealing ring five 22 are used to improve the sealing of the rupture disc 7, the dissolution delay piece 8 and the pressure transmission plug 9 and the channel, preventing liquid leakage.

[0031] The outer wall of the piston 3 is fixedly connected with the anti-wear correction ring one 14 and the anti-wear correction ring two 15.

[0032] Specifically, the anti-wear correction ring one 14 and the anti-wear correction ring two 15 are used to control the moving position of the piston 3.

[0033] The outer wall of the piston 3 is provided with the back ring one 11, the back ring three 12 and the back ring two 13, and the inner parts of the back ring one 11, the back ring three 12 and the back ring two 13 are fixedly provided with the sealing ring one 17, the sealing ring six 18 and the sealing ring two 19.

[0034] Specifically, the back ring one 11, the back ring three 12 and the back ring two 13 are used to install the sealing ring one 17, the sealing ring six 18 and the sealing ring two 19, and the sealing ring one 17, the sealing ring six 18 and the sealing ring two 19 are used to improve the sealing between the piston 3 and the sliding sleeve.

[0035] The surface of the sleeve 2 is provided with a mounting hole three, the outer wall of the lower connector 4 is provided with a threaded hole by tapping, the inner part of the mounting hole three is inserted with a fixed screw 23, and the fixed screw 23 is screwed with the threaded hole.

[0036] Specifically, after the sleeve 2 is screwed with the lower connector 4, the stability of the connection between the two can be increased by the fixed screw 23.

[0037] The working principle is that the sliding sleeve is placed into the designated position in the well according to the normal running procedure, and after the relevant procedures before activation are completed, the hydraulic activation of the sliding sleeve is started, first, the liquid pressure is applied in the upper joint 1 and the piston 3, when the pressure reaches the breaking pressure of the rupture disc 7, the rupture disc 7 is broken, the fracturing fluid enters the inside of the rupture disc 7, the delay disc 8 is dissolved in contact with the fracturing fluid, when it is completely dissolved, the pressure transmission hole of the pressure transmission plug 9 is exposed, the fracturing fluid enters, passes through the pressure transmission hole of the pressure transmission plug 9 and the fracturing pressure transmission channel of the upper joint 1, and the pressure is transmitted to the piston 3, when the pressure is greater than the shear value of the shear pin 16, the shear pin 16 is broken, the piston 3 and the mandrel 6 are pushed to move downward together, the piston 3 position is controlled by the anti-wear correction ring 1 4 and the anti-wear correction ring 2 15, when the piston 3 moves to the position, the rupture cap 10 is exposed, the pressure acts on the inside of the rupture cap 10, when the pressure is greater than the breaking pressure of the rupture cap 10, the rupture cap 10 is opened, and the fracturing is started.

[0038] The device is mainly used for the first-stage fracturing of an oil and gas well, avoids the first-stage perforation, can perform overall pressure testing on the whole well oil casing before the first-stage perforation, ensures the safety of the whole construction system during the fracturing construction, then opens the fracturing valve for subsequent fracturing after the pressure testing is qualified.

[0039] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0040] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application.

Claims

1. A dissolution controlled delayed pressure fracturing valve comprising a sliding sleeve, characterized in that: The sleeve is composed of an upper joint (1), a sleeve (2) and a lower joint (4), the inside of the lower joint (4) is provided with a shear ring (5), the surface of the shear ring (5) is provided with a mounting hole one, the inside of the mounting hole one is provided with a shear pin (16), one end of the shear pin (16) is inserted with a mandrel (6), one end of the mandrel (6) is threadedly connected with a piston (3), a delayed fracturing assembly is installed in the sleeve, the delayed fracturing assembly comprises a channel, a fracturing pressure transmission channel and a mounting hole two, the channel is arranged in the inside of the upper joint (1), the inside of the channel is sequentially and detachably fixed with a rupture disc (7), a dissolution delay piece (8) and a pressure transmission plug (9) from inside to outside, the surface of the pressure transmission plug (9) is provided with a pressure transmission hole, the fracturing pressure transmission channel is arranged on the surface of the upper joint (1), the fracturing pressure transmission channel is used for establishing a fluid flow channel between the channel and the piston (3), and the mounting hole two is arranged on the surface of the sleeve (2), and the inside of the mounting hole two is detachably fixed with a rupture cap (10).

2. The dissolution controlled, time-delayed, pressure-repeating fracturing valve of claim 1, wherein: The opposite end of the upper joint (1) and the sleeve (2) is threadedly connected, the opposite end of the sleeve (2) and the lower joint (4) is threadedly connected, and the end, away from the sleeve (2), of the lower joint (4) is provided with a male thread by tapping, and the male thread is used for being connected with the oil pipe.

3. The dissolution controlled, time-delayed, pressure- repressurizable fracturing valve of claim 1, wherein: The outside of the piston (3) and the inside of the sleeve (2) form a vacuum cavity.

4. The dissolution controlled, time-delayed, pressure- repressurizable fracturing valve of claim 1, wherein: The rupture disc (7), the dissolution delay piece (8) and the pressure transmission plug (9) are respectively threadedly connected with the channel, and the rupture cap (10) is threadedly connected with the mounting hole two.

5. The dissolution controlled, time-delayed, pressure- repressurizable fracturing valve of claim 1, wherein: The outer wall of the rupture disc (7), the dissolution delay piece (8) and the pressure transmission plug (9) is respectively fixedly provided with a sealing ring three (20), a sealing ring four (21) and a sealing ring five (22).

6. The dissolution control delay repeatable pressure testing fracturing valve according to claim 1, wherein: The outer wall of the piston (3) is fixedly connected with an anti-abrasion correction ring one (14) and an anti-abrasion correction ring two (15).

7. The dissolution controlled, time-delayed, pressure- repressurizable fracturing valve of claim 1, wherein: The outer wall of the piston (3) is provided with a back ring one (11), a back ring three (12) and a back ring two (13).

8. The dissolution controlled, time-delayed, pressure- repressurizable fracturing valve of claim 7, wherein: The inside of the back ring one (11), the back ring three (12) and the back ring two (13) is fixedly provided with a sealing ring one (17), a sealing ring six (18) and a sealing ring two (19).

9. The dissolution controlled, time-delayed, pressure- reversible fracturing valve of claim 1, wherein: The surface of the sleeve (2) is provided with a mounting hole three, the outer wall of the lower joint (4) is tapped to form a threaded hole, the inside of the mounting hole three is inserted with a fixing screw (23), and the fixing screw (23) is threadedly connected with the threaded hole.

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