Automatic pressure release valve and oil well reinforcing device

Abstract

The utility model provides an automatic pressure release valve and an oil well reinforcing device, and belongs to the technical field of underground casing damage repair. The automatic pressure release valve comprises a valve body and a valve plug, a valve cavity used for being communicated with a lower hydraulic anchor is arranged in the valve body, the valve body is provided with a sliding way communicated with the valve cavity and a drainage channel communicated with the sliding way, the valve plug is installed in the corresponding sliding way in a sliding mode, and the part, between the drainage channel and the valve cavity, of the sliding way is a sealing matching section. The end, close to the valve cavity, of the valve plug is provided with an elastic piece used for applying outward acting force along the sliding way to the valve plug. The oil well reinforcing device comprises an inner pipe assembly and an outer pipe assembly, wherein the inner pipe assembly is provided with the automatic pressure release valve. After the automatic pressure release valve in the inner pipe assembly moves out of the outer pipe assembly, the inside and the outside of the inner pipe assembly can be automatically communicated, so that the inside and outside pressure difference at the inner pipe assembly caused by the liquid level height difference is prevented, and anchor flukes of the upper hydraulic anchor and the lower hydraulic anchor are prevented from accidentally stretching out.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of downhole casing damage repair, in particular to an automatic pressure relief valve and an oil well reinforcing device. BACKGROUND

[0002] With the extension of oilfield development time, the downhole conditions will become more and more complex, specifically manifested in the deformation of the perforation section casing, and the number of broken wells is increasing year by year, which seriously affects the normal development of the oilfield.

[0003] The deformation of the perforation section casing and the broken well are mainly treated by the small casing suspension secondary cementing process. This process needs to drill a channel at the deformation of the perforation section casing or the broken well first, then lower the small casing, and then inject cement slurry into the annular space between the small casing and the original well casing. After the cement slurry solidifies, the secondary cementing is completed. This process has a long construction period and high construction cost. In order to ensure the cementing quality, a larger space must be left between the small casing and the original well casing, resulting in a smaller inner diameter of the small casing, which affects the later maintenance operation.

[0004] The Chinese invention patent application with the application publication number CN115217432A and the application publication date October 21, 2022 discloses a long well section patch reinforcing device. The device includes an outer pipe assembly and an inner pipe assembly. The outer pipe assembly includes a hanging pipe, an upper setting pipe, an upper metal seal, a patch pipe, a lower metal seal, and a lower setting pipe. The inner pipe assembly includes a release, an upper hydraulic anchor, a hydraulic booster, a lower hydraulic anchor, and a plug. When the upper metal seal is set on the well casing, the release is locked on the hanging pipe, the upper and lower hydraulic anchors are anchored on the upper setting pipe and the patch pipe respectively, and the hydraulic booster generates a pulling force on both ends of the upper metal seal to achieve the setting of the upper metal seal. When the lower metal seal is set on the well casing, the upper and lower hydraulic anchors are anchored on the patch pipe and the lower setting pipe respectively, and the hydraulic booster generates a pulling force on both ends of the lower metal seal to achieve the setting of the lower metal seal.

[0005] The above-mentioned device does not need to use cement for cementing, thus reducing the construction cost and shortening the construction period. Moreover, a larger space is not needed between the patch pipe and the original well casing, so the inner diameter of the patch pipe can be larger, which is beneficial to the later maintenance operation.

[0006] The upper hydraulic anchor and the lower hydraulic anchor in the device have flukes, and the flukes can realize anchoring operation after being extended. Whether the flukes are extended depends on the internal and external pressure difference at the upper hydraulic anchor and the lower hydraulic anchor. When the internal pressure at the upper hydraulic anchor and the lower hydraulic anchor is greater than the external pressure, the flukes will be extended. In the process of construction by using the device, the running tool is connected with the oil pipe, and water needs to be injected into the inner tube assembly through the oil pipe to provide the internal pressure. The liquid level in the original well casing determines the external pressure of the inner tube assembly. However, the original liquid level in the original well casing cannot be accurately determined. Therefore, in order to facilitate the control of the internal and external pressure difference, the original well casing and the oil pipe need to be filled with water and the liquid level needs to be to the well mouth before construction. In this way, the liquid level in the oil pipe is also at the well mouth, and the internal and external pressure at the upper hydraulic anchor and the lower hydraulic anchor is balanced when there is no additional pressure.

[0007] After completion of the setting, the oil pipe needs to be pulled out. Since the oil pipe occupies the space in the original well casing when the oil pipe is in the original well casing, the liquid level in the original well casing will decrease in the process of pulling the oil pipe upward. The liquid level in the oil pipe is always at the well mouth, so the liquid level in the oil pipe will be higher than the liquid level in the original well casing, and the height difference of the liquid level will gradually increase. Therefore, the internal and external pressure difference at the upper hydraulic anchor and the lower hydraulic anchor will also become larger, which causes the flukes to be unexpectedly extended in the process of pulling the oil pipe upward, and thus a construction accident is likely to occur. Practical new type content

[0008] One of the purposes of the present utility model is to provide an automatic pressure relief valve to solve the technical problem that the flukes will be unexpectedly extended in the process of pulling the oil pipe upward after completion of the setting in the prior art.

[0009] Another purpose of the present utility model is to provide an oil well reinforcing device to solve the technical problem that the flukes will be unexpectedly extended in the process of pulling the oil pipe upward after completion of the setting in the prior art.

[0010] To achieve the above-mentioned purposes, the technical scheme of an automatic pressure relief valve provided by the present utility model is as follows:

[0011] An automatic pressure relief valve comprises a valve body and a valve plug. The valve body is provided with a valve cavity for being communicated with a lower hydraulic anchor. The valve body is provided with a sliding channel communicated with the valve cavity and a relief passage communicated with the sliding channel. The valve plug is slidably installed in the corresponding sliding channel. The part of the sliding channel between the relief passage and the valve cavity is a sealing fitting section. An elastic member for applying an outward force along the sliding channel to the valve plug is arranged at one end of the valve plug close to the valve cavity. The valve plug has a sealing position for sealing fitting with the sealing fitting section after entering the sealing fitting section. When the automatic pressure relief valve is located in an outer tube assembly, the valve plug can be kept in the sealing position under the transverse limitation of the outer tube assembly. The valve plug also has a relief position for exiting the sealing fitting section under the action of the elastic member when the automatic pressure relief valve is moved out of the outer tube assembly, so that the relief passage is communicated with the valve cavity.

[0012] As a further improvement, the slide further comprises a guiding section for guiding the valve plug after the valve plug exits the sealing fitting section, the guiding section being located at the end of the sealing fitting section away from the valve cavity.

[0013] As a further improvement, the inner diameter of the guiding section is larger than the inner diameter of the sealing fitting section, a stop step being formed between the guiding section and the sealing fitting section, and a fitting step being provided on the valve plug for stop fitting with the stop step when the valve plug is in the sealing position.

[0014] As a further improvement, a limiting member is fixedly provided on the valve body for limiting the valve plug in the outward direction along the slide, and a limiting groove with the groove depth direction being the same as the moving direction of the valve plug is provided on the end face of the end of the valve plug away from the valve cavity, the limiting member stop fitting with the groove bottom of the limiting groove when the valve plug is in the drainage position.

[0015] As a further improvement, a mounting groove is provided on the valve body for mounting the limiting member, the groove depth of the mounting groove being greater than or equal to the thickness of the limiting member so that the limiting member does not protrude from the outer peripheral surface of the valve body.

[0016] As a further improvement, a guiding slope is provided on the end of the valve plug away from the valve cavity for fitting with the outer pipe assembly during the process that the inner pipe assembly enters the outer pipe assembly so that the valve plug is retracted into the slide.

[0017] As a further improvement, two valve plugs are oppositely provided on the valve body, and the elastic member is provided between the two valve plugs and top pressing fitting with the two valve plugs.

[0018] As a further improvement, the valve cavity is a flat hole structure.

[0019] As a further improvement, the cross-sectional shape of the valve cavity is a waist shape.

[0020] The automatic pressure relief valve belongs to an open-type invention and creation.

[0021] To achieve the above object, the utility model provides a kind of oil well reinforcing device technical scheme:

[0022] A kind of oil well reinforcing device, including outer tube assembly and inner tube assembly, inner tube assembly includes from top to bottom setting and releases, upper hydraulic anchor, hydraulic booster, lower hydraulic anchor and plug, lower hydraulic anchor and plug are provided with automatic pressure relief valve between, automatic pressure relief valve includes valve body and valve plug, valve body is equipped with the valve cavity for being communicated with lower hydraulic anchor, valve body is equipped with the slide way being communicated with valve cavity, the flow channel being communicated with slide way, valve plug is slidably installed in corresponding slide way, the part of slide way between flow channel and valve cavity is sealing fit section, the end of valve plug close to valve cavity is provided with the elastic member for exerting the force along slide way outward to valve plug, valve plug has the sealing position that enters sealing fit section and sealing fit with sealing fit section, when automatic pressure relief valve is located in outer tube assembly, valve plug can be kept in sealing position under the transverse location of outer tube assembly, valve plug also has the flow position that when automatic pressure relief valve moves out of outer tube assembly, exit sealing fit section under the action of elastic member, so that flow channel is communicated with valve cavity.

[0023] As further improvement, slide way also includes guiding section for guiding valve plug after valve plug exits sealing fit section, and guiding section is located at the end of sealing fit section away from valve cavity.

[0024] As further improvement, the inner diameter of guiding section is greater than the inner diameter of sealing fit section, and a stop step is formed between guiding section and sealing fit section, and a cooperation step is arranged on valve plug for stop cooperation with stop step when valve plug is in sealing position.

[0025] As further improvement, a limiting member is fixedly arranged on valve body for limiting valve plug in outward direction along slide way, and a limiting groove is arranged on the end face of valve plug away from valve cavity, and the groove depth direction of limiting groove is same as the moving direction of valve plug, and limiting member and groove bottom of limiting groove stop cooperate when valve plug is in flow position.

[0026] As further improvement, an installation groove is arranged on valve body for installing limiting member, and the groove depth of installation groove is greater than or equal to the thickness of limiting member so that limiting member does not protrude from the outer peripheral surface of valve body.

[0027] As further improvement, a guide inclined surface is arranged on the end of valve plug away from valve cavity for cooperating with outer tube assembly to make valve plug retract into slide way during the process that inner tube assembly enters outer tube assembly.

[0028] As further improvement, two valve plugs are relatively arranged on valve body, and elastic member is arranged between two valve plugs and top pressing cooperates with two valve plugs.

[0029] As further improvement, valve cavity is flat hole structure.

[0030] As a further improvement, the cross-sectional shape of the valve chamber is hourglass-shaped.

[0031] The oil well reinforcing device is an improvement on the prior art.When the automatic pressure relief valve in the oil well reinforcing device is located in the outer pipe assembly, the valve plug cannot move outward due to the limitation of the outer pipe assembly, so the valve plug of the automatic pressure relief valve is always in the sealing position, thereby ensuring that the inner pipe assembly has good sealing effect during the pressing process and the pressure leakage does not occur, so that the setting operation can be smoothly completed. When the automatic pressure relief valve is moved out of the outer pipe assembly, the valve plug is no longer limited by the outer pipe assembly, so both valve plugs move away from the valve chamber to the flow position under the action of the spring, at this time the inner pipe assembly is connected inside and outside, the liquid in the inner pipe assembly can flow into the space between the original well casing and the oil pipe, thereby ensuring that the liquid level in the oil pipe and the original well casing can always be kept flat during the process of lifting the oil pipe, preventing the internal and external pressure difference at the inner pipe assembly caused by the liquid level difference, avoiding the accidental extension of the anchor claws of the upper and lower hydraulic anchors. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 FIG. 1 is a structural schematic view of an outer pipe assembly of an embodiment 1 of the oil well reinforcing device in the utility model;

[0033] Figure 2 FIG. 2 is a structural schematic view of an inner pipe assembly of the embodiment 1 of the oil well reinforcing device in the utility model;

[0034] Figure 3 FIG. 3 is a structural schematic view of an automatic pressure relief valve of the embodiment 1 of the oil well reinforcing device in the utility model;

[0035] Figure 4 FIG. 4 is a sectional view along A-A of the embodiment 1 of the oil well reinforcing device in the utility model; Figure 3

[0036] Figure 5 FIG. 5 is a sectional view of the automatic pressure relief valve of the embodiment 1 of the oil well reinforcing device in the utility model after removing the valve plug.

[0037] FIG. 6 is a legend of the drawings.

[0038] 1. Lifting pipe; 2. Upper sealing sleeve pipe; 3. First sealer; 4. Upper reinforcing pipe; 5. Second sealer; 6. Lower reinforcing pipe; 7. Third sealer; 8. Lower sealing sleeve pipe; 9. Release mechanism; 10. Upper hydraulic anchor; 11. Hydraulic booster; 12. Lower hydraulic anchor; 13. Automatic pressure relief valve; 1301. Valve body; 1302. Valve cavity; 1303. Outer conical surface; 1304. Inner conical surface; 1305. Slide rail; 13051 13052. Sealing section; 13053. Guide section; 1306. Drainage channel; 1307. Valve plug; 13071. Large diameter section; 13072. Small diameter section; 13073. Fitting step; 13074. Limiting groove; 1308. Spring; 1309. Stopping step; 1310. Limiting element; 1311. Mounting groove; 1312. Inclined surface; 1313. Sealing ring; 14. Plug; 15. Opening; 16. Oil pipe. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to the embodiments.

[0040] To address the problems in the prior art, the basic concept of this utility model is to connect the inner and outer parts of the inner tube assembly after the outer tube assembly is pulled upwards from the inner tube assembly, so that the liquid inside the inner tube assembly can flow outwards, ensuring that the pressure difference between the inside and outside is equal, thereby preventing the anchor tooth from accidentally protruding.

[0041] Specific embodiment 1 of the oil well reinforcement device provided by this utility model:

[0042] An oil well reinforcement device includes an outer tube assembly and an inner tube assembly.

[0043] See appendix Figure 1 The outer tube assembly includes, from top to bottom, a lifting tube 1, an upper sealing sleeve tube 2, a first sealer 3, an upper reinforcing tube 4, a second sealer 5, a lower reinforcing tube 6, a third sealer 7, and a lower sealing sleeve tube 8, connected in sequence.

[0044] See appendix Figure 2 The inner pipe assembly includes, from top to bottom, a release handle 9, an upper hydraulic anchor 10, a hydraulic booster 11, a lower hydraulic anchor 12, an automatic pressure relief valve 13, and a plug 14. The specific structure of the outer pipe assembly and the inner pipe assembly, excluding the automatic pressure relief valve 13, can be found in the outer and inner pipe assemblies in Chinese invention patent application CN115217432A, and will not be elaborated upon here.

[0045] See appendix Figure 3 Appendix Figure 4 and attached Figure 5The automatic pressure relief valve 13 comprises a valve body 1301, the valve body 1301 is provided with a valve cavity 1302 penetratingly in the up-down direction, the valve cavity 1302 is a slit hole structure, specifically, the cross-sectional shape of the valve cavity 1302 is a waist shape. One end of the valve body 1301 in the up-down direction is provided with an outer taper surface 1303, and the other end is provided with an inner taper surface 1304, and the outer taper surface 1303 and the inner taper surface 1304 are both formed with a threaded structure. The end of the valve body 1301 provided with the inner taper surface 1304 is connected with the lower hydraulic anchor 12, and the valve cavity 1302 is communicated with the inner cavity of the lower hydraulic anchor 12; the end of the valve body 1301 provided with the outer taper surface 1303 is connected with the cap-shaped plug 14, and the valve cavity 1302 is blocked by the plug 14.

[0046] For the convenience of description, the opening direction of the valve cavity 1302, that is, the up-down direction, is taken as the first direction in the embodiment, the cross-sectional shape of the valve cavity 1302 is a waist shape, the length direction of the waist shape is the second direction, and the width direction of the waist shape is the third direction.

[0047] The valve body 1301 is coaxially provided with two sliding channels 1305, the axes of the two sliding channels 1305 are in the same direction as the third direction, and the inward end of the sliding channel 1305 is communicated with the valve cavity 1302. Since the size of the valve cavity 1302 in the second direction is larger, the diameter of the sliding channel 1305 can be larger. The valve body 1301 is also provided with a waist-shaped flow channel 1306, the flow channel 1306 is provided with four, and each sliding channel 1305 corresponds to two, the flow channel 1306 communicates the corresponding sliding channel 1305 with the outer surface of the valve body 1301, the extension directions of the two flow channels 1306 corresponding to each sliding channel 1305 are in the same direction as the second direction, and the two flow channels 1306 corresponding to each sliding channel 1305 are arranged along the second direction.

[0048] The automatic pressure relief valve 13 further comprises valve plugs 1307 arranged in the sliding channels 1305, the ends of the two valve plugs 1307 facing the valve cavity 1302 are opposite, and a resilient member is arranged between the two valve plugs 1307, which is specifically a spring 1308 in the embodiment, the two ends of the spring 1308 are respectively in pressure contact with the end portions of the two valve plugs 1307, and the end portions of the valve plugs 1307 are provided with accommodating grooves for accommodating the spring 1308. The spring 1308 penetrates the valve cavity 1302 in the third direction, but since the cross-sectional shape of the valve cavity 1302 is a waist shape, the liquid in the valve cavity 1302 can flow from both sides of the spring 1308, so the spring 1308 will not block the flow of the liquid in the valve cavity 1302. In other embodiments, the resilient member can also be a rubber air bag.

[0049] The slide 1305 comprises a sealing fitting section 13051 and a guiding section 13052, wherein the sealing fitting section 13051 is the part of the slide 1305 between the corresponding leakage passage 1306 and the valve cavity 1302, the guiding section 13052 is located at the end of the sealing fitting section 13051 away from the valve cavity 1302, and the inner diameter of the guiding section 13052 is larger than that of the sealing fitting section 13051, so that a stop step 1309 is formed between the guiding section 13052 and the sealing fitting section 13051. The leakage passage 1306 is in communication with the guiding section 13052 of the corresponding slide 1305 in particular.

[0050] The valve plug 1307 is shaped to match the shape of the slide 1305, and comprises a large-diameter section 13071 and a small-diameter section 13072, wherein the small-diameter section 13072 corresponds to the sealing fitting section 13051, and the large-diameter section 13071 corresponds to the guiding section 13052. Two sealing rings 1313 are arranged on the small-diameter section 13072, so that the small-diameter section 13072 can form a sealing fit with the sealing fitting section 13051 when the small-diameter section 13072 extends into the sealing fitting section 13051. The large-diameter section 13071 is guided to fit with the guiding section 13052, so that the valve plug 1307 can be guided to move in the third direction. A fitting step 13073 is formed between the large-diameter section 13071 and the small-diameter section 13072, which can be stopped from fitting with the stop step 1309 after the valve plug 1307 is retracted into the slide 1305.

[0051] The valve body 1301 is fixedly provided with a limiting piece 1310 on both sides in the second direction, the limiting piece 1310 is a long strip structure, and the valve body 1301 is provided with a mounting groove 1311 at the corresponding position for mounting the limiting piece 1310, the groove depth direction of the mounting groove 1311 is in the same direction as the second direction, and the groove depth of the mounting groove 1311 is equal to the thickness of the limiting piece 1310 in the second direction, so that the limiting piece 1310 does not protrude from the outer surface of the valve body 1301. The length direction of the limiting piece 1310 is in the same direction as the first direction, both ends of the length direction of the limiting piece 1310 are fixedly connected with the valve body 1301 by bolts, and the middle position of the limiting piece 1310 in the length direction is located at the mouth of the corresponding slide 1305.

[0052] The valve plug 1307 is provided with a limiting groove 13074 on the end face away from the valve cavity 1302, the groove depth direction of the limiting groove 13074 is in the same direction as the second direction, and the groove depth of the limiting groove 13074 is greater than the size of the limiting piece 1310 in the second direction. After the valve plug 1307 moves away from the valve cavity 1302, the groove bottom of the limiting groove 13074 can be in contact with the limiting piece 1310 and prevent the valve plug 1307 from further moving under the limiting action of the limiting piece 1310.

[0053] The upper and lower sides of the valve plug 1307 away from the one end of the valve cavity 1302 are also provided with guide bevels 1312, which can facilitate the valve plug 1307 to retract into the corresponding slide 1305 during the process of assembling the inner tube assembly into the outer tube assembly. In other embodiments, the valve plug 1307 can also not be provided with the guide bevel 1312, which requires the valve plug 1307 to be continuously pressed during the process of assembling the inner tube assembly into the outer tube assembly.

[0054] In use, the valve plug 1307 has two working positions, which are the sealing position and the flow position respectively.

[0055] When the inner tube assembly is located in the outer tube assembly, especially when the automatic pressure relief valve 13 is located in the outer tube assembly, the valve plug 1307 is located in the sealing position, at this time the valve plug 1307 is completely located in the corresponding slide 1305, the small diameter section 13072 of the valve plug 1307 is in sealing fit with the sealing fit section 13051, cutting off the connection between the flow channel 1306 and the valve cavity 1302. Moreover, since the automatic pressure relief valve 13 is located in the outer tube assembly, the inner wall of the outer tube assembly forms a limiting effect on the valve plug 1307, the matching step 13073 on the valve plug 1307 is always in stop fit with the stop step 1309 on the valve body 1301, so that the valve plug 1307 always remains in the sealing position, ensuring better sealing of the inner tube assembly. During the process that the valve plug 1307 is in the sealing position, the spring 1308 is always in a compressed state.

[0056] When the automatic pressure relief valve 13 moves out of the outer tube assembly, due to the loss of the limitation of the outer tube assembly, both valve plugs 1307 of the automatic pressure relief valve 13 will move away from the valve cavity 1302 under the action of the spring 1308, and finally make the groove bottom wall of the limiting groove 13074 in stop fit with the limiting piece 1310, at this time the valve plug 1307 is in the flow position. When the valve plug 1307 is in the flow position, the small diameter section 13072 of the valve plug 1307 exits from the sealing fit section 13051, the flow channel 1306 is connected with the valve cavity 1302 through the sealing fit section 13051, then the liquid in the inner tube assembly can flow out through the flow channel 1306.

[0057] Before construction, the inner tube assembly and the outer tube assembly are assembled, the release hand 9 assembly is connected with the oil pipe 16, and the lifting pipe 1 in the outer tube assembly is matched with the release hand 9 in the inner tube assembly, so that the outer tube assembly is lowered into the well together with the inner tube assembly. After the pipe string is lowered to the designed depth, the space between the original well casing and the oil pipe 16 is filled with water, and then water is injected into the oil pipe 16 to pressurize, so that the upper hydraulic anchor 10 is anchored at the upper setting casing 2, and the lower hydraulic anchor 12 is anchored at the upper reinforcing pipe 4. Continue to pressurize, so that the hydraulic tensioner 11 exerts tension on the upper and lower ends of the first sealer 3 to achieve the setting of the first sealer 3.

[0058] After the setting of the first packer 3 is completed, the pressure is released, the anchor teeth of the upper hydraulic anchor 10 and the lower hydraulic anchor 12 are retracted, and the cooperation between the releasing hand 9 and the hanging pipe 1 is released. Since the setting of the first packer 3 has been completed, the outer pipe assembly will not sink after the cooperation between the releasing hand 9 and the hanging pipe 1. The inner pipe assembly is lowered again, and the upper hydraulic anchor 10 is anchored at the upper reinforcing pipe 4, and the lower hydraulic anchor 12 is anchored at the lower reinforcing pipe 6, and the setting of the second packer 5 is performed. After the setting of the second packer 5 is completed, the pressure is released again, and the inner pipe assembly is lowered, so that the upper hydraulic anchor 10 is anchored at the lower reinforcing pipe 6, and the lower hydraulic anchor 12 is anchored at the lower setting sleeve 8, so as to perform the setting of the third packer 7. After the setting of the third packer 7 is completed, the pressure is released again.

[0059] When the automatic pressure relief valve 13 is located in the outer pipe assembly, the valve plug 1307 of the automatic pressure relief valve 13 is always in the sealing position, so that the inner pipe assembly has good sealing effect during the pressure test, and the pressure leakage does not occur, so that the setting operation is smoothly completed.

[0060] After the setting of the three packers is completed, the tubing 16 is lifted, and the inner pipe assembly is lifted together with the tubing 16. When the automatic pressure relief valve 13 moves out of the outer pipe assembly, the valve plug 1307 is no longer limited in the transverse direction of the outer pipe assembly, so that the two valve plugs 1307 move away from the valve cavity 1302 under the action of the spring 1308 to the drainage position. At this time, the inner pipe assembly is in communication with the outside, and the liquid in the inner pipe assembly can flow into the space between the original well casing and the tubing 16, so that the liquid level in the tubing 16 and the original well casing can always be kept flat during the lifting of the tubing 16, so as to prevent the inner and outer pressure difference at the inner pipe assembly caused by the liquid level difference, and avoid the accidental extension of the anchor claws of the upper hydraulic anchor 10 and the lower hydraulic anchor 12.

[0061] Before construction, the opening 15 can be processed in advance on the upper reinforcing pipe 4 and the lower reinforcing pipe 6, so that the downhole perforation after the setting is completed is not needed, and the construction cost is effectively reduced, and the construction period is shortened.

[0062] In one embodiment of the embodiment, four oil layers can be separated by three packers. In other embodiments, the number of packers can be increased or decreased as needed. The setting distance of a single packer is 100 mm, and the stroke of the hydraulic booster 11 is 500 mm. In theory, the hydraulic booster 11 can satisfy the setting of at least four packers at a time. In order to be able to set more packers, the reverse pressure of 3-5 MPa can be applied during the field construction. The reverse pressure refers to the pressure applied to the space between the original well casing and the tubing 16, so that the stroke of the hydraulic booster 11 is restored.

[0063] A specific embodiment 2 of the oil well reinforcing device provided by the utility model:

[0064] The embodiment is based on the embodiment 1, and different from the embodiment 1 is that only one valve plug is arranged in the embodiment, one end of the spring is in abutting pressure with the end of the valve plug close to the valve cavity, and the other end of the spring is in abutting pressure with the inner side wall of the valve cavity opposite to the valve plug.

[0065] In other embodiments, three or four valve plugs can be arranged as required, which will not be repeated here.

[0066] The specific embodiment 3 of the oil well reinforcing device provided by the utility model:

[0067] The embodiment is based on the embodiment 1, and different from the embodiment 1 is that the valve cavity in the embodiment is a blind hole processed on the valve body, and specifically, the upper end of the valve cavity is open and communicates with the lower hydraulic anchor, and the lower end of the valve cavity is closed, and the plug is no longer arranged in the embodiment.

[0068] The specific embodiment 4 of the oil well reinforcing device provided by the utility model:

[0069] The embodiment is based on the embodiment 1, and different from the embodiment 1 is that the limiting piece in the embodiment is a limiting block, and two limiting blocks are arranged, one end of the two limiting blocks is fixedly connected on the valve body through bolts, and the other end of the two limiting blocks overhangs the mouth of the slide, and when the valve plug is in the flow releasing position, the groove bottom of the limiting groove is in abutting stop cooperation with the limiting block.

[0070] In other embodiments, three or four limiting blocks can be uniformly arranged around the mouth of the slide, and the shape of the limiting groove can also be changed accordingly.

[0071] In the embodiment, the mounting groove is still arranged on the valve body to hide the limiting block, so that the limiting block does not protrude from the outer circumferential surface of the valve body. When the thickness of the limiting piece is thin, the limiting groove can also be not arranged.

[0072] The specific embodiment 5 of the oil well reinforcing device provided by the utility model:

[0073] The embodiment is based on the embodiment 1, and different from the embodiment 1 is that the automatic pressure relief valve in the embodiment is not arranged with a limiting piece, and the two ends of the spring in the embodiment are respectively welded and fixed with the two valve plugs, so that the spring is used to prevent the valve plug from directly exiting from the corresponding slide.

[0074] In other embodiments, a steel cable can be fixedly connected between the two valve plugs, so that the two valve plugs can be prevented from exiting from the corresponding slide under the action of the steel cable after the two valve plugs are ejected.

[0075] The specific embodiment 6 of the oil well reinforcing device provided by the utility model:

[0076] The embodiment is based on the embodiment 1, and different from the embodiment 1 is that the slide and the valve plug are equal-diameter structures in the embodiment, and the slide can still guide the valve plug.

[0077] The specific embodiment 7 of the oil well reinforcing device is provided in the utility model.

[0078] The embodiment is based on the embodiment 1, and different from the embodiment 1 is that the valve plug is an equal-diameter structure in the embodiment, and the slide will not guide the valve plug after the valve plug exits the sealing fitting section of the slide.

[0079] The limiting piece can not be arranged in the embodiment, and the valve plug in the flow discharge position can directly exit the corresponding slide, the valve plug is made of a soluble alloy in the embodiment, and the valve plug can be dissolved in the well, and normal operation of the oil well is not affected.

[0080] The specific embodiment 8 of the oil well reinforcing device is provided in the utility model.

[0081] The embodiment is based on the embodiment 1, and different from the embodiment 1 is that the valve cavity is also a flat-hole structure, and the specific shape is a round rectangular shape.

[0082] The specific embodiment 9 of the oil well reinforcing device is provided in the utility model.

[0083] The embodiment is based on the embodiment 1, and different from the embodiment 1 is that the valve cavity is a round-hole structure in the embodiment.

[0084] The specific embodiment of the automatic pressure relief valve is provided in the utility model.

[0085] The automatic pressure relief valve is the automatic pressure relief valve in any one of the specific embodiments 1-9 of the oil well reinforcing device, and details are not repeated here.

[0086] Finally, it needs to be explained that the preferred embodiments described above are only for the utility model, and are not used to limit the utility model, although the utility model is described in detail with reference to the foregoing embodiments, and for the person skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified without creative labor, or some technical features can be replaced. Any modification, equivalent replacement, improvement and the like within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An automatic pressure relief valve characterized by, The automatic pressure relief valve comprises a valve body and a valve plug. The valve body is provided with a valve cavity for communicating with a lower hydraulic anchor. The valve body is provided with a sliding channel communicating with the valve cavity and a discharge channel communicating with the sliding channel. The valve plug is slidably installed in the corresponding sliding channel. The part of the sliding channel between the discharge channel and the valve cavity is a sealing fitting section. The end of the valve plug close to the valve cavity is provided with an elastic member for applying an outward force along the sliding channel to the valve plug. The valve plug has a sealing position for sealing fitting with the sealing fitting section after entering the sealing fitting section. The valve plug can be kept in the sealing position under the transverse limitation of the outer pipe assembly when the automatic pressure relief valve is located in the outer pipe assembly. The valve plug also has a discharge position for exiting the sealing fitting section under the action of the elastic member so as to make the discharge channel communicate with the valve cavity when the automatic pressure relief valve is moved out of the outer pipe assembly.

2. The automatic pressure relief valve according to claim 1, wherein The sliding channel further comprises a guide section for guiding the valve plug after the valve plug exits the sealing fitting section. The guide section is located at the end of the sealing fitting section away from the valve cavity.

3. The automatic pressure relief valve according to claim 2, wherein The inner diameter of the guide section is larger than that of the sealing fitting section. A stop step is formed between the guide section and the sealing fitting section. The valve plug is provided with a fitting step for stop fitting with the stop step when the valve plug is in the sealing position.

4. The pressure relief valve of any one of claims 1 to 3, wherein the valve body is formed of a material having a yield strength of at least 300 MPa. The valve body is fixedly provided with a limiting member for limiting the valve plug in the outward direction along the sliding channel. The end face of the end of the valve plug away from the valve cavity is provided with a limiting groove with the groove depth direction being the same as the moving direction of the valve plug. The limiting member stop fits with the groove bottom of the limiting groove when the valve plug is in the discharge position.

5. The pressure relief valve of claim 4, wherein, The valve body is provided with a mounting groove for mounting the limiting member. The groove depth of the mounting groove is greater than or equal to the thickness of the limiting member so that the limiting member does not protrude from the outer peripheral surface of the valve body.

6. The pressure relief valve of any one of claims 1-3, wherein the valve body is formed of a material having a yield strength of at least 50 ksi. The end of the valve plug away from the valve cavity is provided with a guide inclined surface for cooperating with the outer pipe assembly to make the valve plug retract into the sliding channel during the process that the inner pipe assembly enters the outer pipe assembly.

7. The pressure relief valve of any one of claims 1-3, wherein the valve body is formed of a material having a yield strength of at least 50 ksi. The valve plug is oppositely arranged on the valve body. The elastic member is arranged between the two valve plugs and top-press fits with the two valve plugs.

8. The pressure relief valve of any one of claims 1-3, wherein the valve is automatic. The valve cavity is a flat hole structure.

9. The automatic pressure relief valve of claim 8, wherein, The cross-sectional shape of the valve cavity is a waist shape.

10. An oil well hardening device, comprising an outer pipe assembly and an inner pipe assembly, the inner pipe assembly comprising, from top to bottom, a release mechanism, an upper hydraulic anchor, a hydraulic booster, a lower hydraulic anchor, and a plug, characterized in that, The automatic pressure relief valve according to any one of claims 1-9 is arranged between the lower hydraulic anchor and the plug.

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