Hydrostatic pressure test device and test method for quickly dismounting and mounting self-tightening seal

Abstract

The invention discloses a hydrostatic pressure test device and test method for quick disassembly and assembly and self-tightening sealing, and belongs to the technical field of floating equipment of oil cementing tools, the hydrostatic pressure test device comprises a tank body, an upper sealing cover and a lower sealing cover which are in sealed connection with one another, and the side wall of the top and the side wall of the bottom of the tank body are detachably connected with an upper quick cover and a lower quick cover; the upper sealing cover is connected with a quick exhaust valve communicated with the sealing cavity, and the side wall, close to the lower quick cover, of the tank body is connected with a high-pressure water injection valve and a water injection and drainage valve which are communicated with the sealing cavity. According to the invention, the lower quick cover, the upper quick cover and the tank body adopt a tooth-meshed structure, and can be separated or buckled only by rotating a small angle, so that the technical problem that floating equipment is complicated to disassemble and assemble in a static pressure test in the prior art is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of floating equipment of petroleum cementing tools, and in particular relates to a hydrostatic pressure test device for a quick disassembly and assembly of a self-tightening seal, and also relates to a hydrostatic pressure test method for a quick disassembly and assembly of a self-tightening seal. Background Art

[0002] Water pressure test is widely used in daily life, including water pressure flaw detection, pressure resistance and burst test of small valves, pressure vessels, various metal and non-metallic pipes; water pressure strength and sealing performance test of various oil tools; pressure detection and calibration of pressure instruments; pressure resistance and burst test of fire-fighting equipment such as fire hoses and fire extinguishers. The working principle of floating equipment is based on the principle of buoyancy. Floating hoops and floating shoes are usually made of low-density materials and can float on the surface of mud, thereby sealing the wellbore and preventing mud from leaking out. During the cementing process, the floating equipment moves with the rise or fall of the mud column, ensuring the sealing of the wellbore. Floating equipment is widely used in oil cementing. They are mainly used in cementing operations of oil and gas wells to ensure the stability of the well wall and the sealing of the mud. By utilizing the principle of buoyancy, the floating equipment can adapt to the changes in the liquid level in the well, provide a reliable sealing effect, and thus ensure the success of the cementing operation.

[0003] The floating equipment in the oil cementing tool needs to be tested by hydrostatic pressure test. Figure 3 As shown, most of the current industry adopts radial sealing of the pipe body and adopts super-large gap sealing elements; some also adopt oil field-grade elastic elements. These sealing methods all use threaded mechanisms and use external force to force the seal. For large-sized products, it is very difficult to use thread force and disassemble and assemble; and the dedicated radial sealing element has a certain adaptability range for the annular gap between the product and the tank body, the test cost will also increase, and the versatility is also poor. Summary of the invention

[0004] The first purpose of the present invention is to provide a quick disassembly and assembly self-tightening and sealing hydrostatic pressure test device, which solves the technical problem of complex disassembly and assembly of floating equipment in the hydrostatic pressure test in the prior art.

[0005] The second object of the present invention is to provide a hydrostatic pressure test method for quick disassembly and assembly of a self-tightening seal.

[0006] The first technical solution adopted by the present invention is a hydrostatic pressure test device with quick disassembly and self-tightening sealing, comprising a tank body, an upper sealing cover is sealingly connected to the top opening of the tank body, a lower sealing cover is sealingly connected to the bottom opening of the tank body, a sealed cavity is formed between the upper sealing cover, the tank body and the lower sealing cover, an upper quick cover is detachably connected to the top side wall of the tank body, the upper quick cover abuts against the upper sealing cover, a lower quick cover is detachably connected to the bottom side wall of the tank body, the lower quick cover is fixed to the lower sealing cover by fasteners, and a base is fixed to the bottom of the lower quick cover by fasteners; wherein, the upper sealing cover is connected to a quick exhaust valve communicated with the sealed cavity, and the side wall of the tank body close to the lower quick cover is connected to a high-pressure water injection valve and a water injection and drainage valve communicated with the sealed cavity.

[0007] The first technical solution of the present invention is also characterized in that: The side walls of the tank body near the top and bottom, and the inner walls of the upper quick cover and the lower quick cover are all provided with a plurality of grooves, and a bulge is formed between two adjacent grooves; The grooves on the inner walls of the upper and lower quick covers correspond one to one with the protrusions on the side walls of the tank body near the top and bottom; or, the protrusions on the inner walls of the upper and lower quick covers correspond one to one with the grooves on the side walls of the tank body near the top and bottom.

[0008] A plurality of O-rings a are nested on the side wall of the lower sealing cover, and the lower sealing cover is sealed and connected to the inner wall of the tank body through the O-rings a; a plurality of O-rings b are nested on the side wall of the upper sealing cover, and the upper sealing cover is sealed and connected to the inner wall of the tank body through the O-rings b.

[0009] A plurality of annular sealing grooves are formed on the top surface of the lower sealing cover, and end face sealing rubber gaskets are sleeved in the plurality of annular sealing grooves.

[0010] A threaded through hole is opened at the center of the upper quick cover, a pre-tightening nut is threadedly connected to the threaded through hole, and the bottom end of the pre-tightening nut abuts against the upper sealing cover.

[0011] The base is also provided with a leakage observation port which runs through the center of the lower quick cover and the lower sealing cover.

[0012] The second technical solution adopted by the present invention is a hydrostatic test method for a quick disassembly and assembly self-tightening seal, which adopts the above-mentioned hydrostatic test device for quick disassembly and assembly self-tightening seal, and specifically comprises the following steps: S1, install the test product on the end face sealing rubber pad of the lower sealing cover, and install the auxiliary pad on the top of the test product; S2, buckle the tank body with the lower quick cover, and install the upper sealing cover and the upper quick cover; S3, rotate the pre-tightening nut to assist pre-pressure, open the quick exhaust valve and the water injection and drainage valve, inject tap water from the water injection and drainage valve, and close the water injection and drainage valve and the quick exhaust valve when water overflows from the quick exhaust valve; S4, open the high-pressure water injection valve and inject high-pressure water, observe the pressure gauge value, when the pressure gauge value reaches the test requirement, stop injecting water and close the high-pressure water injection valve, and check for leakage after maintaining the pressure; S5, open the water filling and draining valve, introduce compressed air from the high-pressure water filling valve, quickly drain the water in the tank, rotate the pre-tightening nut and the upper quick cover, remove the auxiliary gasket, lift off the tank and the test product, and complete the static pressure test.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The prior art uses radial circumferential surface sealing, which requires specially designed sealing elements and has high testing costs. The present invention uses the test product end face sealing and uses ordinary end face sealing rubber gaskets, so the testing costs are relatively low. The sealing force of the prior art is provided by manually rotating the threaded sleeve, while the present invention uses the deadweight of the test product and the water pressure in the tank body. The greater the deadweight and the greater the water pressure, the greater the sealing force. The prior art requires rotating the threaded sleeve for disassembly and assembly, while the lower quick cover, the upper quick cover and the tank body of the present invention adopt a gear-engaging structure, which can be disengaged or engaged by just turning a small angle. The prior art applies a greater internal pressure to the test product than the external pressure of the product, which is an expansion force, which has a peeling effect on the metal shell and cement of the test product and is harmful to the product performance. The pressure applied to the product by the present invention is a clamping force, which will not have an adverse effect on the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the hydrostatic pressure testing device with quick disassembly and self-tightening seal of the present invention; Figure 2 It is a structural schematic diagram of a toothed quick buckle in a hydrostatic pressure test device for quick disassembly and assembly of a self-tightening seal of the present invention; Figure 3 The utility model is a hydrostatic pressure testing device for floating equipment in the prior art.

[0015] In the figure, 1. base, 2. lower quick cover, 3. lower sealing cover, 4. O-ring a, 5. end face sealing rubber gasket, 6. test product, 7. auxiliary pad, 8. tank body, 9. upper sealing cover, 10. upper quick cover, 11. pre-tightening nut, 12. quick exhaust valve, 13. O-ring b, 14. high-pressure water injection valve, 15. water injection and drainage valve, 16. leakage observation port. DETAILED DESCRIPTION

[0016] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0017] Example 1 like Figure 1As shown, the hydrostatic pressure test device with quick disassembly and self-tightening seal disclosed in the present invention comprises a tank body 8, the top opening of the tank body 8 is sealedly connected with an upper sealing cover 9, the bottom opening of the tank body 8 is sealedly connected with a lower sealing cover 3, a sealed cavity is formed between the upper sealing cover 9, the tank body 8 and the lower sealing cover 3, in the hydrostatic pressure test, the test product 6 is placed in the sealed cavity, water is injected into the cavity to increase pressure, the top side wall of the tank body 8 is detachably connected with an upper quick cover 10, the upper quick cover 10 is in contact with the upper sealing cover 9, the bottom side wall of the tank body 8 is detachably connected with a lower quick cover 2, the lower quick cover 2 is fixed to the lower sealing cover 3 by fasteners Then, the bottom of the lower quick cover 2 is fixedly connected to the base 1 by fasteners; wherein, the upper sealing cover 9 is connected to a quick exhaust valve 12 connected to the sealing cavity, the quick exhaust valve 12 is mainly used to exhaust the air inside the tank body, and is a key component to ensure the safety of the water pressure test, the side wall of the tank body 8 close to the lower quick cover 2 is connected to a high-pressure water injection valve 14 and a water injection and drainage valve 15 connected to the sealing cavity, and the base 1 is also provided with a leakage observation port 16 that runs through the center of the lower quick cover 2 and the lower sealing cover 3, and the leakage observation port 16 is mainly used to use an endoscopic probe to probe from the leakage observation port 16 to carefully observe the leakage situation.

[0018] Example 2 like Figure 2 As shown, on the basis of Example 1, the side walls of the tank body 8 near the top and bottom, the inner walls of the upper quick cover 10 and the lower quick cover 2 are all provided with a plurality of grooves, and a bulge is formed between two adjacent grooves; The grooves on the inner walls of the upper quick cover 10 and the lower quick cover 2 correspond one-to-one to the protrusions on the side walls of the tank body 8 near the top and the bottom; or, the protrusions on the inner walls of the upper quick cover 10 and the lower quick cover 2 correspond one-to-one to the grooves on the side walls of the tank body 8 near the top and the bottom.

[0019] The tank body 8 adopts a tooth-engaging quick end cover. As long as the inner and outer teeth are aligned, it can be fastened. When the inner and outer teeth are staggered, it can be opened. This structure can not only withstand a large load, but also achieve quick opening and closing. It is more convenient than the threaded structure and avoids the time-consuming and laborious disassembly and assembly of the threaded connection. Specifically: by rotating the upper quick cover 10 to install or remove it from the tank body 8, by rotating the tank body 8, it is installed or removed from the lower quick cover 2. Example 3 On the basis of Example 1, a plurality of O-rings a4 are nested on the side wall of the lower sealing cover 3, and the lower sealing cover 3 is sealed to the inner wall of the tank body 8 through the O-ring a4, which can ensure that the lower end of the tank body 8 is airtight; a plurality of O-rings b13 are nested on the side wall of the upper sealing cover 9, and the upper sealing cover 9 is sealed to the inner wall of the tank body 8 through the O-ring b13, which can ensure that the upper end of the tank body 8 is airtight.

[0020] Furthermore, a plurality of annular sealing grooves are formed on the top surface of the lower sealing cover 3, and end face sealing rubber gaskets 5 are sleeved in the plurality of annular sealing grooves. The annular end face of the test product 6 is used as the sealing surface, the end face sealing rubber gasket 5 is used as the sealing element, and the dead weight of the test product 6 and the pressure of the water in the tank body 8 are used as the sealing force. The greater the dead weight and the greater the internal water pressure, the greater the sealing force and the better the sealing effect. The plurality of annular sealing grooves are to accommodate test products 6 of different diameters.

[0021] Furthermore, a threaded through hole is opened at the center of the upper quick cover 10 , and a pre-tightening nut 11 is threadedly connected to the threaded through hole, and the bottom end of the pre-tightening nut 11 abuts against the upper sealing cover 9 .

[0022] The pre-tightening nut 11 is used to compensate for the insufficient initial sealing force and is installed last. When the initial sealing force is insufficient, just gently rotate the pre-tightening nut 11. The pre-tightening nut 11 applies pressure to the upper sealing cover 9. For large-sized and heavy test products 6, the pre-tightening nut 11 does not need to be rotated and can only be used as a hanger.

[0023] The present invention also discloses a hydrostatic pressure test method for a quick disassembly and assembly self-tightening seal, which uses the above-mentioned hydrostatic pressure test device for a quick disassembly and assembly self-tightening seal, and specifically comprises the following steps: S1, install the test product 6 on the end face sealing rubber pad 5 of the lower sealing cover 3, and install the auxiliary pad 7 on the top of the test product 6; specifically, the test product 6 is placed vertically and uprightly into the annular sealing groove of the lower sealing cover 3 with the end facing downward and the head facing upward. The top of the test product 6 is equipped with the auxiliary pad 7, which is used to compensate for the height of the test product. After the test product 6 and the auxiliary pad 7 are properly placed, they can be hoisted into the tank body 8; S2, buckle the tank body 8 with the lower quick cover 2, install the upper sealing cover 9 and the upper quick cover 10; hoist the tank body 8 vertically and upright into the lower quick cover 2, and gently rotate it at an angle, so that the protrusion or groove of the lower quick cover 2 and the protrusion or groove of the tank body 8 can be engaged, and the installation of the upper quick cover 10 and the tank body 8 is similar; S3, rotating the pre-tightening nut 11 to assist pre-compression, opening the quick exhaust valve 12 and the water injection and drainage valve 15, injecting tap water from the water injection and drainage valve 15, and closing the water injection and drainage valve 15 and the quick exhaust valve 12 after water overflows from the quick exhaust valve 12; S4, open the high-pressure water injection valve 14 and inject high-pressure water, observe the value of the pressure gauge, stop injecting water when the value of the pressure gauge reaches the test requirement, close the high-pressure water injection valve 14, and check for leakage after maintaining the pressure; specifically, observe whether there is leakage, or use an endoscope probe to probe from the leakage observation port 16 to carefully observe the leakage; the pressure maintenance time is generally several minutes according to the standard; S5, open the water injection and drainage valve 15, introduce compressed air from the high-pressure water injection valve 14, quickly drain the water in the tank body 8, rotate the pre-tightening nut 11 and the upper quick cover 10, remove the auxiliary cushion block 7, and lift off the tank body 8 and the test product 6. At this time, the test product 6 can be easily taken out, the end face sealing rubber gasket 5 can be checked or replaced, and the O-ring a4 can be checked in preparation for another test.

Claims

1. A quick disassembly and assembly self-tightening seal hydrostatic pressure test device, characterized in that: The invention comprises a tank body (8), wherein the top opening of the tank body (8) is sealedly connected to an upper sealing cover (9), and the bottom opening of the tank body (8) is sealedly connected to a lower sealing cover (3); a sealed cavity is formed between the upper sealing cover (9), the tank body (8) and the lower sealing cover (3); the top side wall of the tank body (8) is detachably connected to an upper quick cover (10), the upper quick cover (10) abuts against the upper sealing cover (9), and the bottom side wall of the tank body (8) is detachably connected to a lower quick cover (2); the lower quick cover (2) is fixedly connected to the lower sealing cover (3) via fasteners, and the bottom of the lower quick cover (2) is fixedly connected to a base (1) via fasteners; wherein the upper sealing cover (9) is connected to a quick exhaust valve (12) communicating with the sealed cavity, and the side wall of the tank body (8) close to the lower quick cover (2) is connected to a high-pressure water injection valve (14) and a water injection and drainage valve (15) communicating with the sealed cavity.

2. The quick disassembly and self-tightening sealing hydrostatic pressure testing device according to claim 1 is characterized in that: The side walls of the tank body (8) close to the top and bottom, the upper quick cover (10) and the inner wall of the lower quick cover (2) are all provided with a plurality of grooves, and a bulge is formed between two adjacent grooves; The grooves on the inner walls of the upper quick cover (10) and the lower quick cover (2) correspond one-to-one with the protrusions on the side walls of the tank body (8) near the top and the bottom; or, the protrusions on the inner walls of the upper quick cover (10) and the lower quick cover (2) correspond one-to-one with the grooves on the side walls of the tank body (8) near the top and the bottom.

3. The hydrostatic pressure testing device with quick disassembly and self-tightening seal according to claim 1, characterized in that: A plurality of O-rings a (4) are embedded in the side wall of the lower sealing cover (3), and the lower sealing cover (3) is sealedly connected to the inner wall of the tank body (8) via the O-rings a (4); a plurality of O-rings b (13) are embedded in the side wall of the upper sealing cover (9), and the upper sealing cover (9) is sealedly connected to the inner wall of the tank body (8) via the O-rings b (13).

4. The quick disassembly and self-tightening sealing hydrostatic pressure testing device according to claim 1 is characterized in that: The top surface of the lower sealing cover (3) is provided with a plurality of annular sealing grooves, and end face sealing rubber gaskets (5) are sleeved in the plurality of annular sealing grooves.

5. The hydrostatic pressure testing device with quick disassembly and self-tightening seal according to claim 4, characterized in that: A threaded through hole is formed at the center of the upper quick cover (10), a pre-tightening nut (11) is threadedly connected to the threaded through hole, and the bottom end of the pre-tightening nut (11) abuts against the upper sealing cover (9).

6. The quick disassembly and self-tightening sealing hydrostatic pressure testing device according to claim 1 is characterized in that: The base (1) is also provided with a leakage observation port (16) which passes through the centre of the lower quick cover (2) and the lower sealing cover (3).

7. A method for hydrostatic testing of a quick disassembly self-tightening seal, using a hydrostatic testing device for a quick disassembly self-tightening seal as claimed in claim 5, characterized in that: The specific steps include: S1, install the test product (6) on the end face sealing rubber pad (5) of the lower sealing cover (3), and install the auxiliary pad (7) on the top of the test product (6); S2, snapping the tank body (8) together with the lower quick cover (2), and installing the upper sealing cover (9) and the upper quick cover (10); S3, rotating the pre-tightening nut (11) to assist pre-pressure, opening the quick exhaust valve (12) and the water injection and drainage valve (15), injecting tap water from the water injection and drainage valve (15), and closing the water injection and drainage valve (15) and the quick exhaust valve (12) after water overflows from the quick exhaust valve (12); S4, open the high-pressure water injection valve (14) and inject high-pressure water, observe the value of the pressure gauge, stop injecting water when the value of the pressure gauge reaches the test requirement, close the high-pressure water injection valve (14), maintain the pressure, and check for leakage through the leakage observation port (16); S5, open the water filling and draining valve (15), introduce compressed air from the high-pressure water filling valve (14), quickly drain the water in the tank body (8), rotate the pre-tightening nut (11) and the upper quick cover (10), remove the auxiliary cushion block (7), lift off the tank body (8) and the test product (6), and complete the static pressure test.

Images