Stress testing device

Abstract

The invention provides a stress testing device. The stress testing device comprises a booster pump, a main pipeline, a pressure gauge, a first branch, a first stop valve, a second branch, a second stop valve, a testing kettle and a stress testing component. One end of the main pipeline is connected with the booster pump. The pressure gauge is arranged on the main pipeline. And the first branch and the second branch are connected with the other end of the main pipeline. The first stop valve is arranged on the first branch. The second stop valve is arranged on the second branch. The test kettle comprises a first cavity and a second cavity, cement paste is arranged in the first cavity, water is arranged in the second cavity, the first branch is connected with the first cavity, the second branch is connected with the second cavity, when the numerical value of the pressure gauge needs to be read, the first stop valve is opened, the second stop valve is closed, and when pressure needs to be injected into the second cavity, the second stop valve is opened. Closing the first stop valve and opening the second stop valve. The stress testing component is used for measuring the stress of the cement paste. The problem that a pressurizing pipeline of an existing experimental device is complex is solved.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas well cementing operation experimental devices, and in particular to a stress testing device. Background Art

[0002] Cement sheath refers to the cement stone formed by cement slurry in the annular space, which is used to wrap the casing and form a ring. After the cementing operation, the casing and the formation will be bonded together by the cement sheath. Accurate calculation of the stress on the cement sheath is a key link in the strength design of the cement sheath, which is related to the long-term isolation of the cement sheath and even the integrity of the wellbore.

[0003] After the cement slurry is injected, the cement slurry is in a liquid state. At this time, the forces in the casing-cement slurry-formation system are the liquid column pressure of the cement slurry, the radial stress at the interface between the casing and the cement ring, and the formation pressure. When the cement slurry gradually changes from a liquid state to a plastic state and finally becomes a cement ring, the cement slurry column pressure will disappear, and the forces on the cement ring are the radial stress at the casing-cement ring interface and the formation pressure. Many theoretical calculation models have been established to study how the radial stress at the casing-cement ring interface changes after being transmitted to the cement ring and the formation interface through the cement ring.

[0004] In order to verify the correctness of the theoretical calculation model, the prestressed simulation experimental device disclosed in Chinese patent CN118327546A can be used, which includes an upper cover, a shell, a first casing, a second casing and a plurality of pressure pumps. The upper cover is covered on the shell. A first annulus is formed between the first casing and the second casing. After cement is injected into the first annulus, a cement ring is formed. A strain sensor is installed on the outer wall of the second casing to detect the strain of the first annulus filled with cement. The device can be used to measure the strain of the first annulus.

[0005] However, the device uses multiple booster pumps to provide pressure for the experiment to perform stress testing, which makes the layout of the pipeline more complicated and the cost is high. Therefore, the existing experimental device has the problem of complex booster pipelines. Summary of the invention

[0006] The purpose of the present application is to provide a stress testing device with simplified pipeline layout, including a booster pump, a main line, a pressure gauge, a first branch, a first stop valve, a second branch, a second stop valve, a test kettle and a stress testing component. One end of the main line is connected to the booster pump. The pressure gauge is arranged on the main line. The first branch is connected to the other end of the main line. The first stop valve is arranged on the first branch. The second branch is connected to the other end of the main line. The second stop valve is arranged on the second branch.

[0007] The test kettle comprises a first cavity and a second cavity, wherein cement slurry is arranged in the first cavity, water is arranged in the second cavity, the first branch is connected to the first cavity, and the second branch is connected to the second cavity, wherein when the value of the pressure gauge needs to be read, the first stop valve is opened and the second stop valve is closed, and when pressure needs to be injected into the second cavity, the first stop valve is closed and the second stop valve is opened. The stress test component is used to measure the stress of the cement slurry, and the stress test component is connected to the test kettle.

[0008] Optionally, the test kettle includes a kettle cover, a sleeve, a kettle body and a base, the kettle cover is connected to the kettle body, the kettle body is connected to the base, the first branch and the second branch are connected to the kettle cover, two ends of the sleeve respectively abut the kettle cover and the base, the sleeve is arranged in the kettle body, the first cavity is arranged between the sleeve and the kettle body, and the second cavity is arranged in the sleeve.

[0009] Optionally, the kettle cover includes a first boss, the kettle body includes a first cutout, and the first boss is embedded in the first cutout.

[0010] Optionally, the test kettle further includes a first upper sealing ring, the first incision is located at the top of the kettle body, and the first upper sealing ring is sandwiched between the first boss and the first incision.

[0011] Optionally, the test kettle further includes a first fastener, the kettle cover includes a kettle cover body, the kettle cover body is connected to the first boss, and the first fastener connects the kettle cover body and the kettle body.

[0012] Optionally, the base includes a second boss, the kettle body includes a second cutout, and the second boss is embedded in the second cutout.

[0013] Optionally, the test kettle further includes a first lower sealing ring, the second incision is arranged at the bottom end of the kettle body, the second boss and the base are coaxially arranged, and the first lower sealing ring is clamped between the second boss and the second incision.

[0014] Optionally, the stress testing component includes a pressure sensor, a pressure detection device and an electric wire, two ends of the electric wire are respectively connected to the pressure sensor and the pressure detection device, the electric wire is passed through the kettle cover, and the pressure sensor is set in the cement slurry.

[0015] Optionally, the test kettle further includes a second upper sealing ring, the kettle cover includes a first groove, the top end of the sleeve is embedded in the first groove, and the second upper sealing ring is clamped between the first groove and the top end of the sleeve.

[0016] Optionally, the test kettle also includes a second lower sealing ring, the base includes a second groove, the second lower sealing ring is embedded in the second groove, the bottom end of the sleeve is embedded in the second groove, and the second lower sealing ring is clamped between the second groove and the bottom end of the sleeve.

[0017] The beneficial effects of the present application are as follows: by setting a booster pump, a main line, a pressure gauge, a first branch, a first stop valve, a second branch, a second stop valve, a test kettle and a stress test component. One end of the main line is connected to the booster pump. The pressure gauge is arranged on the main line. The first branch is connected to the other end of the main line. The first stop valve is arranged on the first branch. The second branch is connected to the other end of the main line. The second stop valve is arranged on the second branch. The test kettle includes a first cavity and a second cavity, cement slurry is arranged in the first cavity, water is arranged in the second cavity, the first branch is connected to the first cavity, and the second branch is connected to the second cavity, wherein, when it is necessary to read the value of the pressure gauge, the first stop valve is opened and the second stop valve is closed, and when it is necessary to inject pressure into the second cavity, the first stop valve is closed and the second stop valve is opened. The stress test component is used to measure the stress of the cement slurry, and the stress test component is connected to the test kettle.

[0018] By setting the first branch and the second branch, setting the first stop valve on the first branch and the second stop valve on the second branch, when it is necessary to read the value of the pressure gauge, the first stop valve is opened and the second stop valve is closed, and when it is necessary to inject pressure into the second cavity, the second stop valve is opened and the first stop valve is closed. The pressure required for cement sheath stress testing can be provided by using a booster pump, which simplifies the layout of the pipeline and reduces the overall cost of the stress testing device.

[0019] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application and implement it according to the contents of the specification, the present application is described in detail below with reference to the preferred embodiments of the present application and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an application cross-sectional view of a stress testing device in one embodiment of the present application;

[0021] Figure 2 It is a cross-sectional exploded view of a test kettle in one embodiment of the present application.

[0022] Wherein, the reference numerals are:

[0023] 100 Booster Pump

[0024] 101 Main Road

[0025] 102 Pressure gauge

[0026] 103 First Branch Road

[0027] 104 first stop valve

[0028] 105 Second Branch Road

[0029] 106 Second stop valve

[0030] 107 Test kettle

[0031] 1070 cauldron cover

[0032] 10700 First Boss

[0033] 107000 First Groove

[0034] 107001 The third groove

[0035] 10701 cauldron cover body

[0036] 1071 casing

[0037] 1072 Kettle

[0038] 10720 First incision

[0039] 107200 Fourth groove

[0040] 10721 Second Incision

[0041] 107210 Sixth groove

[0042] 1073 Base

[0043] 10730 Second Boss

[0044] 107300 Second groove

[0045] 107301 Fifth groove

[0046] 10731 Base body

[0047] 1074 First Fastener

[0048] 1075 Second fastener

[0049] 1076 First upper sealing ring

[0050] 1077 First lower sealing ring

[0051] 1078 Second upper sealing ring

[0052] 1079 Second lower sealing ring

[0053] 1083 Third stop valve

[0054] 108 Stress Test Components

[0055] 1080 Pressure Sensor

[0056] 1081 Pressure detection device

[0057] 1082 Wire

[0058] 109 Pressure relief valve

[0059] 2 Cement slurry

[0060] 3 Water DETAILED DESCRIPTION

[0061] The following is an explanation of the implementation of the present application by means of specific embodiments. People familiar with the technology can easily understand other advantages and effects of the present application from the contents disclosed in this specification.

[0062] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments. In order to enable those skilled in the art to better understand the present application scheme, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only embodiments of a part of the present application, not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in the field without making creative work should fall within the scope of protection of the present application.

[0063] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0064] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0065] Please refer to Figure 1 and Figure 2 In this embodiment, a stress testing device is provided, including a booster pump 100, a main line 101, a pressure gauge 102, a first branch 103, a first stop valve 104, a second branch 105, a second stop valve 106, a test kettle 107 and a stress testing component 108. One end of the main line 101 is connected to the booster pump 100. The pressure gauge 102 is arranged on the main line 101. The first branch 103 is connected to the other end of the main line 101. The first stop valve 104 is arranged on the first branch 103. The second branch 105 is connected to the other end of the main line 101. The second stop valve 106 is arranged on the second branch 105.

[0066] Please refer to Figure 1 and Figure 2 The test kettle 107 includes a first cavity and a second cavity, wherein cement slurry 2 is arranged in the first cavity, and water 3 is arranged in the second cavity, wherein the first branch 103 is connected to the first cavity, and the second branch 105 is connected to the second cavity, wherein when the value of the pressure gauge 102 needs to be read, the first stop valve 104 is opened and the second stop valve 106 is closed, and when pressure needs to be injected into the second cavity, the first stop valve 104 is closed and the second stop valve 106 is opened. The stress test component 108 is used to measure the stress of the cement slurry 2. The stress test component 108 is connected to the test kettle 107.

[0067] Please refer to Figure 1 and Figure 2 By setting the first branch 103 and the second branch 105, the first stop valve 104 is set on the first branch 103, and the second stop valve 106 is set on the second branch 105. When it is necessary to read the value of the pressure gauge 102, the first stop valve 104 is opened and the second stop valve 106 is closed. When it is necessary to inject pressure into the second cavity, the second stop valve 106 is opened and the first stop valve 104 is closed. One booster pump 100 can provide the pressure required for cement sheath stress testing, which simplifies the layout of the pipeline and reduces the overall cost of the stress testing device.

[0068] Please refer to Figure 1 and Figure 2, the booster pump 100 can be a gas booster pump. One end of the main line 101 can be connected to the booster pump 100 by means of flange connection, threaded connection or welding connection. The other end of the main line 101 can be connected to the first branch 103 and the second branch 105 at the same connection point P. The pressure gauge 102 can be connected to the main line 101 by means of plug-in, flange connection, threaded connection or welding connection. The other end of the main line 101 can be connected to the first branch 103 and the second branch 105 by means of flange connection, threaded connection or welding connection. The first branch 103 and the second branch 105 can be connected to the test kettle 107, and the first branch 103 and the second branch 105 are connected to the first cavity and the second cavity respectively. For the specific connection method of the stress test component 108 and the test kettle 107, please refer to the subsequent content of the embodiment.

[0069] like Figure 1 As shown, the first stop valve 104 can be connected to the first branch 103 by means of flange connection, threaded connection or welding connection. The second stop valve 106 can be connected to the second branch 105 by means of flange connection, threaded connection or welding connection. The first cavity can be an annular cavity, and the second cavity can be a cylindrical cavity.

[0070] like Figure 1 As shown, when the first stop valve 104 is opened and the second stop valve 106 is closed, the second cavity and the main line 101 are not connected, and the pressure measured by the pressure gauge 102 is the pressure in the first cavity. When the first stop valve 104 is closed and the second stop valve 106 is opened, the first cavity and the main line 101 are not connected, and the booster pump 100 can inject pressure into the second cavity to increase the pressure of the water 3 in the second cavity. The injection pressure can be achieved by injecting air into the second cavity by the booster pump 100. In order to ensure the safety of the pipeline, a pressure relief valve 109 can also be set at the second branch 105 and point P respectively. The pressure relief valve 109 can be a liquefied petroleum gas safety valve model A42F-16C of Shanghai Huxuan Valve Manufacturing Co., Ltd.

[0071] Please also refer to Figure 1 and Figure 2Optionally, the test kettle 107 includes a kettle cover 1070, a sleeve 1071, a kettle body 1072 and a base 1073, the kettle cover 1070 is connected to the kettle body 1072, the kettle body 1072 is connected to the base 1073, the first branch 103 and the second branch 105 are connected to the kettle cover 1070, the two ends of the sleeve 1071 respectively abut the kettle cover 1070 and the base 1073, the sleeve 1071 is arranged in the kettle body 1072, the first cavity is arranged between the sleeve 1071 and the kettle body 1072, and the second cavity is arranged in the sleeve 1071. The kettle cover 1070 and the base 1073 can be disc-shaped. The kettle cover 1070 and the kettle body 1072 can be connected by screwing. For example, the kettle cover 1070 may be connected to the kettle body 1072 via a first fastener 1074, and the base 1073 may be connected to the kettle body 1072 via a second fastener 1075. The first fastener 1074 and the second fastener 1075 may be bolts.

[0072] Please also refer to Figure 1 and Figure 2 The first branch 103 and the second branch 105 can be connected to the kettle cover 1070 by threaded connection. The sleeve 1071 and the kettle body 1072 can be coaxial and spaced apart. The first cavity can be an annular space between the outer side of the sleeve 1071 and the inner side of the kettle body 1072. The second cavity can be the inner cavity of the sleeve 1071. The top and bottom ends of the sleeve 1071 can be respectively against the first boss 10700 and the second boss 10730.

[0073] Please also refer to Figure 1 and Figure 2 Optionally, the kettle cover 1070 includes a first boss 10700, and the kettle body 1072 includes a first notch 10720, and the first boss 10700 is embedded in the first notch 10720. In this way, the side wall of the first notch 10720 can be used to support the kettle cover 1070 from the radial direction of the kettle cover 1070, so there is no need to set a blocking part on the kettle cover 1070 to resist the outer side of the kettle body 1072, thereby reducing the radial size of the kettle cover 1070 and saving materials for making the kettle cover 1070. The first notch 10720 can be formed by cutting off a ring-shaped material from the inner side of the top of the kettle body 1072, that is, the first notch 10720 can be a cylindrical step. The longitudinal section of the first notch 10720 can be L-shaped. The diameter of the first notch 10720 is the same as the diameter of the first boss 10700. The depth of the first cutout 10720 is the same as the height of the first boss 10700 .

[0074] Please also refer to Figure 1 and Figure 2Optionally, the test kettle 107 further includes a first upper sealing ring 1076, the first cutout 10720 is located at the top of the kettle body 1072, and the first upper sealing ring 1076 is sandwiched between the first boss 10700 and the first cutout 10720. This arrangement can prevent the first upper sealing ring 1076 from falling out. Because the upper and lower sides of the first upper sealing ring 1076 are respectively supported by the first boss 10700 and the first cutout 10720, the first upper sealing ring 1076 will not fall down.

[0075] Please also refer to Figure 1 and Figure 2 , a third groove 107001 may be provided on the first boss 10700, and a fourth groove 107200 may be provided on the first notch 10720. The third groove 107001 and the fourth groove 107200 may be coaxially provided, and the shape and size of the cross section of the third groove 107001 and the shape and size of the cross section of the fourth groove 107200 are the same. The direction of the third groove 107001 and the fourth groove 107200 may be annular, and the cross section of the third groove 107001 and the fourth groove 107200 may be rectangular. The first upper sealing ring 1076 may be embedded in the annular space enclosed by the third groove 107001 and the fourth groove 107200.

[0076] Please also refer to Figure 1 and Figure 2 Optionally, the test kettle 107 further includes a first fastener 1074, the kettle cover 1070 includes a kettle cover body 10701, the kettle cover body 10701 is connected to the first boss 10700, and the first fastener 1074 connects the kettle cover body 10701 and the kettle body 1072. The first boss 10700 is arranged to protrude from the lower end surface of the kettle cover body 10701. The kettle cover body 10701 and the first boss 10700 can be integrally formed and connected. The kettle cover body 10701 has a small thickness, and the first fastener 1074 is connected to the kettle cover body 10701, so that the length of the first fastener 1074 exposed from the kettle cover body 10701 is longer, so that the connection depth of the first fastener 1074 and the kettle body 1072 is deeper, so that the connection between the kettle cover 1070 and the kettle body 1072 is more secure. The first boss 10700 can be coaxially arranged with the kettle cover body 10701.

[0077] Please also refer to Figure 1 and Figure 2Optionally, the base 1073 includes a second boss 10730, the kettle body 1072 includes a second cutout 10721, and the second boss 10730 is inserted into the second cutout 10721. In this way, the side wall of the second cutout 10721 can be used to support the base 1073 from the radial direction of the base 1073, so there is no need to set a blocking part on the base 1073 to resist the outer side of the kettle body 1072, thereby reducing the radial size of the base 1073 and saving the material used to make the base 1073.

[0078] Please also refer to Figure 1 and Figure 2 , the second incision 10721 may be formed by cutting off a circular ring-shaped material from the inner side of the bottom end of the kettle body 1072, that is, the second incision 10721 may be a cylindrical step. The longitudinal section of the second incision 10721 may be L-shaped. The diameter of the second incision 10721 is the same as the diameter of the second boss 10730. The depth of the second incision 10721 is the same as the height of the second boss 10730. The base 1073 may include a base body 10731, and the second boss 10730 may be integrally connected to the base body 10731. The second boss 10730 may protrude from the upper surface of the base body 10731. The base body 10731 may be connected to the kettle body 1072 by a second fastener 1075, so that the connection between the base 1073 and the kettle body 1072 is more secure.

[0079] Please also refer to Figure 1 and Figure 2 Optionally, the test kettle 107 further includes a first lower sealing ring 1077, a second cutout 10721 is disposed at the bottom end of the kettle body 1072, a second boss 10730 and a base 1073 are disposed coaxially, and the first lower sealing ring 1077 is sandwiched between the second boss 10730 and the second cutout 10721. This arrangement allows the first lower sealing ring 1077 to be closer to the first cavity, reduces the penetration depth of the gas used for pressurization into the gap between the base 1073 and the kettle body 1072, and reduces the force generated by the gas to separate the base 1073 and the kettle body 1072.

[0080] Please also refer to Figure 1 and Figure 2 , a fifth groove 107301 may be provided on the base 1073, and a sixth groove 107210 may be provided on the second cutout 10721. The fifth groove 107301 may be provided on the second boss 10730. The shape and size of the cross section of the fifth groove 107301 and the shape and size of the cross section of the sixth groove 107210 may be the same. The fifth groove 107301 and the sixth groove 107210 may be annular in direction, and the cross section may be rectangular. The first lower sealing ring 1077 may be embedded in the annular space enclosed by the fifth groove 107301 and the sixth groove 107210.

[0081] Please also refer to Figure 1 and Figure 2 Optionally, the stress testing component 108 includes a pressure sensor 1080, a pressure detection device 1081 and a wire 1082, the two ends of the wire 1082 are respectively connected to the pressure sensor 1080 and the pressure detection device 1081, the wire 1082 is passed through the kettle cover 1070, and the pressure sensor 1080 is set in the cement slurry 2. The wire 1082 is passed through the kettle cover 1070, that is, the wire 1082, the first branch 103 and the second branch 105 can all be connected to the kettle cover 1070, and there is no need to set a through hole in the kettle body 1072 or the base 1073 to allow the wire 1082, the first branch 103 or the second branch 105 to pass through, which simplifies the processing technology of setting the through hole for allowing the wire 1082, the first branch 103 or the second branch 105 to pass through.

[0082] Please also refer to Figure 1 and Figure 2 , a sealing hole may be provided on the kettle cover 1070 to allow the wire 1082 to pass through. Two additional sealing holes may be provided on the kettle cover 1070 to be sealed and connected to the first branch 103 and the second branch 105 respectively. The wire 1082, the first branch 103 and the second branch 105 may be connected to the first boss 10700. The pressure sensor 1080 may be a strain gauge or an IPT series pressure sensor for oil drilling instruments of Kulite Company of the United States or a differential pressure transmitter model PPM-T127J of Changsha Titanium Electronic Equipment Co., Ltd. The pressure sensor 1080 is used to measure the stress of the cement slurry 2.

[0083] like Figure 1 As shown, the number of the pressure sensors 1080 can be at least four, and two pressure sensors 1080 can be respectively arranged in the cement slurry 2 on the left and right sides of the casing 1071. The two wires 1082 of the two pressure sensors 1080 on the left can be combined into one and pass through the sealing hole on the left side of the kettle cover 1070, and the two wires 1082 of the two pressure sensors 1080 on the right can be combined into one and pass through the sealing hole on the right side of the kettle cover 1070. The wires 1082 of the four pressure sensors 1080 can finally be combined into one and connected to the pressure detection device 1081.

[0084] Please also refer to Figure 1 and Figure 2Optionally, the test kettle 107 further includes a second upper sealing ring 1078, the kettle cover 1070 includes a first groove 107000, the top end of the sleeve 1071 is embedded in the first groove 107000, and the second upper sealing ring 1078 is sandwiched between the first groove 107000 and the top end of the sleeve 1071. In this way, when the sleeve 1071 is bent and deformed along its radial direction, the second upper sealing ring 1078 can be squeezed upward, so that the sleeve 1071 and the kettle cover 1070 are more tightly sealed. The longitudinal section of the first groove 107000 can be rectangular, and the direction of the first groove 107000 is annular. The first groove 107000 can be set on the first boss 10700. The center circle diameter of the first groove 107000 is smaller than the center circle diameter of the third groove 107001.

[0085] Please also refer to Figure 1 and Figure 2 Optionally, the test kettle 107 further includes a second lower sealing ring 1079, the base 1073 includes a second groove 107300, the second lower sealing ring 1079 is embedded in the second groove 107300, the bottom end of the sleeve 1071 is embedded in the second groove 107300, and the second lower sealing ring 1079 is sandwiched between the second groove 107300 and the bottom end of the sleeve 1071. In this way, when the sleeve 1071 is bent and deformed in its radial direction, the second lower sealing ring 1079 can be pressed downward, so that the sleeve 1071 and the base 1073 are more tightly sealed.

[0086] like Figure 2 As shown, the longitudinal section of the second groove 107300 is rectangular, and the direction of the second groove 107300 is annular. The first groove 107000, the second groove 107300 and the sleeve 1071 can be coaxially arranged. The second groove 107300 can be arranged on the second boss 10730. The center circle diameter of the second groove 107300 is smaller than the center circle diameter of the fifth groove 107301.

[0087] Please also refer to Figure 1 and Figure 2 The first upper sealing ring 1076, the first lower sealing ring 1077, the second upper sealing ring 1078 and the second lower sealing ring 1079 can be made of rubber such as nitrile rubber, hydrogenated nitrile rubber or polyurethane rubber. The material of the test kettle 107 can be metal, such as stainless steel. The main line 101, the first branch line 103 and the second branch line 105 can be seamless steel pipes or stainless steel pipes.

[0088] like Figure 1As shown, a third stop valve 1083 can be set on the right side of point P. During the cement ring stress test, cement slurry 2 can be injected into the first cavity and water 3 can be injected into the second cavity. Then the first stop valve 104 is closed and the second stop valve 106 and the third stop valve 1083 are opened. The booster pump 100 is used to inject gas into the second cavity to increase the pressure of the water 3 in the second cavity. At this time, the static pressure of the liquid column of the casing 1071 that the cement slurry 2 is subjected to during the setting process can be simulated.

[0089] like Figure 1 As shown, open the first stop valve 104 and the third stop valve 1083 and close the second stop valve 106, adjust the first stop valve 104 and the third stop valve 1083, observe the value displayed by the pressure gauge 102, and pump gas into the first cavity to increase the static pressure of the cement slurry 2 in the first cavity. At this time, the static pressure of the mud liquid column that the cement slurry 2 is subjected to in the underground in the actual working condition can be simulated. The pressure sensor 1080 can transmit the measured stress of the cement slurry 2 to the pressure detection device 1081. The pressure detection device 1081 can be a petroleum casing hydrostatic tester with a model number of SUP_TGS_70 of Jinan Simingte Technology Co., Ltd. The booster pump 100 can be a gas booster pump with a model number of B-100 of Jinan Simingte Technology Co., Ltd.

[0090] like Figure 1 As shown, the first stop valve 104, the second stop valve 106 and the third stop valve 1083 can be manual, electric, pneumatic or hydraulic stop valves. The specifications (such as nominal diameter, nominal pressure and working temperature, etc.) of the first stop valve 104, the second stop valve 106 and the third stop valve 1083 can be the same, for example, they can all be J41 H-type national standard stop valves of Shanghai Gaochuan Valve Co., Ltd. When the first stop valve 104, the second stop valve 106 and the third stop valve 1083 are electric, pneumatic or hydraulic, they can be controlled by a controller. The pressure gauge 102 can be a mechanical pressure gauge or an electric pressure gauge. The value of the pressure gauge 102 can be manually copied or read by a controller. The pressure gauge 102 can be a diaphragm pressure gauge of Fuyang Wanxing Instrument Co., Ltd.

[0091] The stress testing device provided in the embodiment of the present application is introduced in detail above. For those skilled in the art, according to the idea of ​​the embodiment of the present application, there will be some changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation of the present application. All equivalent modifications or changes made according to the spirit and technical ideas of the present application should still be covered by the claims of the present application.

Claims

1. A stress testing device, characterized in that: include: Booster pump; A main pipeline, one end of which is connected to the booster pump; A pressure gauge, which is arranged on the main pipe; A first branch line connected to the other end of the main line; a first stop valve, which is arranged on the first branch; A second branch line connected to the other end of the main line; a second stop valve, which is arranged on the second branch; A test kettle, comprising a first cavity and a second cavity, wherein cement slurry is arranged in the first cavity, water is arranged in the second cavity, the first branch is connected to the first cavity, and the second branch is connected to the second cavity, wherein when the value of the pressure gauge needs to be read, the first stop valve is opened and the second stop valve is closed, and when pressure needs to be injected into the second cavity, the first stop valve is closed and the second stop valve is opened; as well as A stress testing component is used to measure the stress of the cement slurry, and the stress testing component is connected to the testing kettle.

2. The stress testing device according to claim 1, characterized in that: The test kettle comprises a kettle cover, a sleeve, a kettle body and a base, the kettle cover is connected to the kettle body, the kettle body is connected to the base, the first branch and the second branch are connected to the kettle cover, two ends of the sleeve respectively abut the kettle cover and the base, the sleeve is arranged in the kettle body, the first cavity is arranged between the sleeve and the kettle body, and the second cavity is arranged in the sleeve.

3. The stress testing device according to claim 2, characterized in that: The kettle cover comprises a first boss, the kettle body comprises a first cutout, and the first boss is embedded in the first cutout.

4. The stress testing device according to claim 3, characterized in that: The test kettle further includes a first upper sealing ring, the first cutout is located at the top of the kettle body, and the first upper sealing ring is sandwiched between the first boss and the first cutout.

5. The stress testing device according to claim 3, characterized in that: The test kettle further includes a first fastener, the kettle cover includes a kettle cover body, the kettle cover body is connected to the first boss, and the first fastener connects the kettle cover body and the kettle body.

6. The stress testing device according to claim 2, characterized in that: The base includes a second boss, the kettle body includes a second cutout, and the second boss is embedded in the second cutout.

7. The stress testing device according to claim 6, characterized in that: The test kettle also includes a first lower sealing ring, the second cutout is arranged at the bottom end of the kettle body, the second boss and the base are coaxially arranged, and the first lower sealing ring is sandwiched between the second boss and the second cutout.

8. The stress testing device according to claim 2, characterized in that: The stress testing component includes a pressure sensor, a pressure detection device and an electric wire. The two ends of the electric wire are respectively connected to the pressure sensor and the pressure detection device. The electric wire is passed through the kettle cover, and the pressure sensor is set in the cement slurry.

9. The stress testing device according to claim 2, characterized in that: The test kettle further includes a second upper sealing ring, the kettle cover includes a first groove, the top end of the sleeve is embedded in the first groove, and the second upper sealing ring is sandwiched between the first groove and the top end of the sleeve.

10. The stress testing device according to claim 2, characterized in that: The test kettle also includes a second lower sealing ring, the base includes a second groove, the second lower sealing ring is embedded in the second groove, the bottom end of the sleeve is embedded in the second groove, and the second lower sealing ring is clamped between the second groove and the bottom end of the sleeve.

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