A graded cementing tool continuous performance test system and test method

Abstract

The application discloses a kind of hierarchical cementing tool continuous performance test system and test method, the system includes: liquid supply device, rubber plug containing device, the tool containing cylinder of being tested, gravity plug and closing rubber plug;Wherein, rubber plug containing device includes: end cap, rubber plug containing cavity piece, two stop lever assemblies and three loose joints;End cap is detachably connected with rubber plug containing cavity piece;Three through holes are opened in rubber plug containing cavity piece, and three loose joints are embedded in through hole;Two mounting holes are opened between adjacent two through holes of rubber plug containing cavity piece, and two stop lever assemblies are installed in mounting hole;Rubber plug containing cavity piece is detachably connected with the tool containing cylinder of being tested, and the tool containing cylinder of being tested is used to contain hierarchical cementing tool being tested, and rubber plug containing cavity piece is detachably connected with hierarchical cementing tool being tested;In untested state, gravity plug and closing rubber plug are located in rubber plug containing cavity piece, and gravity plug and closing rubber plug are respectively limited by the stop lever of stop lever assembly.

Description

Technical Field

[0001] This invention relates to the field of tools used in drilling, completion, and cementing engineering of oil and gas wells, and particularly to a continuous performance testing system and method for graded cementing tools. Background Technology

[0002] Staged cementing tools, also known as staged clamps or dual-stage clamps, are special devices that divide cementing operations into two stages. They are primarily used in cementing operations where the amount of cement injected in a single operation is too large, the formation cannot withstand excessive hydraulic column pressure, special formations need to be isolated, annular air leakage must be prevented after cementing, the temperature difference between the upper and lower sections of the cemented section is large, and the properties of the cement slurry are difficult to adjust. Before leaving the factory, prototype staged cementing tools undergo overall sealing tests, circulation hole opening tests, circulation hole closing tests, and post-circulation hole closing sealing tests to verify their reliability. Summary of the Invention

[0003] In order to enable continuous high-temperature performance testing of graded cementing tools and solve the problems of discontinuous testing, cumbersome operation, only room temperature testing, long cycle and low efficiency of existing graded cementing tool prototypes, this invention provides a continuous performance testing system and method for graded cementing tools.

[0004] In a first aspect, embodiments of the present invention provide a staged cementing tool continuous performance testing system, which may include: a fluid supply device, a rubber plug receiving device, a test tool receiving cylinder, a gravity plug, and a closing rubber plug;

[0005] The rubber plug receiving device may include: an end cap, a rubber plug cavity, two stopper assemblies, and three unions; the end cap is detachably connected to the upper end of the rubber plug cavity; the rubber plug cavity has three through holes in the vertical direction, and the three unions are embedded in the through holes; the rubber plug cavity has two mounting holes between two adjacent through holes in the vertical direction, and the two stopper assemblies are installed in the mounting holes; the lower end of the rubber plug cavity is detachably connected to the test tool receiving cylinder, the test tool receiving cylinder is used to receive the test stage cementing tool, and the lower end of the rubber plug cavity is detachably connected to the upper end of the test stage cementing tool;

[0006] In the untested state, the gravity plug and the closing rubber plug are located within the rubber plug cavity, and the gravity plug and the closing rubber plug are respectively limited by the stop lever of the stop lever assembly.

[0007] In an optional embodiment, the above-described testing system may further include: a connecting joint and a locking connecting ring located between the rubber stopper cavity and the test tool receiving cylinder;

[0008] The upper end of the connecting joint is detachably connected to the rubber stopper cavity.

[0009] The connecting joint has a boss in the middle, and the locking connecting ring is sleeved on the outside of the boss. The connecting joint is detachably connected to the test tool receiving cylinder through the boss and the locking connecting ring.

[0010] The lower end of the connecting joint extends into the interior of the test tool housing and is detachably connected to the upper end of the test graded cementing tool.

[0011] In another optional embodiment, the upper end of the connecting joint is threadedly connected to the rubber plug cavity; the lower end of the connecting joint is threadedly connected to the upper end of the tested graded cementing tool.

[0012] The upper end of the boss is provided with an external thread, the lower end of the locking connecting ring is provided with an internal thread, and the upper end of the test tool receiving cylinder is provided with an external thread; the locking connecting ring is nested on the outside of the boss and the test tool receiving cylinder, and the connecting joint and the test grade cementing tool are threadedly connected through the locking connecting ring.

[0013] In another optional embodiment, the above-described testing system may further include: a lower connector, which is detachably connected to the lower end of the test tool receiving cylinder, for closing the lower end of the test tool receiving cylinder.

[0014] In another optional embodiment, the above-described testing system may further include: a heating belt, an insulation layer, a temperature sensor, and a thermometer;

[0015] The heating band is wrapped around the outside of the housing of the test tool, the insulation layer is wrapped around the outside of the heating band, and the temperature sensor is located between the heating band and the insulation layer and is electrically connected to the thermometer.

[0016] In another alternative embodiment, the closing rubber plug is located above the gravity plug, the gravity plug is limited by the lower stop assembly, and the closing rubber plug is limited by the upper stop assembly.

[0017] In another optional embodiment, the liquid supply device may include: a liquid storage tank, a safety valve, a pressure testing pump, a check valve, a pressure gauge, and three throttle valves;

[0018] The liquid storage tank, the safety valve, the pressure testing pump, the check valve, and the three throttle valves are connected in sequence through pipelines, and the three throttle valves are respectively connected to the union joint; the pressure gauge is located on the pipeline between the check valve and the three throttle valves.

[0019] In another alternative embodiment, the above-described testing system may further include: a fixed support; the test tool receiving cylinder is mounted on the fixed support.

[0020] In a second aspect, embodiments of the present invention provide a method for continuous performance testing of graded cementing tools, wherein the graded cementing tool under test is tested according to the continuous performance testing system for graded cementing tools described in the first aspect, and the method may include:

[0021] The cementing tool to be tested is connected to the lower end of the rubber plug cavity of the rubber plug receiving device, and the cementing tool to be tested is placed in the receiving cylinder of the tool to be tested.

[0022] Open the end cap of the rubber stopper receiving device, open the lower stopper assembly so that the stopper in the lower stopper assembly extends into the cavity of the rubber stopper cavity, and insert the gravity stopper; open the upper stopper assembly so that the stopper in the upper stopper assembly extends into the cavity of the rubber stopper cavity, insert the closing rubber stopper and close the end cap;

[0023] Open the lower stop assembly to allow the stop rod in the lower stop assembly to exit the chamber of the rubber plug cavity and release the gravity plug, so that the gravity plug falls into the opening seat of the cementing tool under test under gravity; close the throttle valve connected to the upper union and the throttle valve connected to the lower union of the rubber plug receiving device, open the test pump of the fluid supply device and inject fluid into the cementing tool under test through the throttle valve connected to the middle union of the rubber plug receiving device. When the pressure reaches the opening pressure, the closing sleeve, closing seat and opening seat in the cementing tool under test move down so that the first circulation hole on the closing sleeve and the second circulation hole on the tool body in the cementing tool under test are aligned, and the opening pressure is recorded.

[0024] Close the throttle valves connected to the two unions at the bottom of the rubber plug receiving device, open the upper stop rod assembly to allow the stop rod in the upper stop rod assembly to exit the chamber of the rubber plug receiving component and release the closing rubber plug; turn on the pressure test pump of the liquid supply device and inject liquid into the cementing tool under test through the throttle valve connected to the union at the top of the rubber plug receiving device. The liquid pushes the closing rubber plug downward and acts on the closing seat. When the pressure reaches the closing pressure, the closing seat drives the closing sleeve downward so that the first circulation hole and the second circulation hole are misaligned and the closing pressure is recorded.

[0025] In another optional embodiment, with the staged cementing tool continuous performance testing system including a connecting joint and a locking connecting ring, the staged cementing tool to be tested is connected to the lower end of the connecting joint, and the staged cementing tool to be tested is placed in the test tool receiving cylinder; and the locking connecting ring is used to lock the connecting joint to the rubber plug cavity.

[0026] In another alternative embodiment, after inserting the closing rubber plug and closing the end cap, the following may also be included:

[0027] Close the throttle valves connected to the two upper unions of the rubber stopper receiving device, open the throttle valve connected to the lower union of the rubber stopper receiving device, turn on the test pump of the liquid supply device and inject high-temperature heat transfer oil into the receiving cylinder of the test tool through the throttle valve connected to the lower union, then turn on the heating belt and heat to the set temperature.

[0028] In another alternative embodiment, after recording the shut-off pressure, the process may further include: continuing to inject fluid into the tested staged cementing tool, pressurizing it, and testing the sealing performance of the tested staged cementing tool after the circulation hole is closed.

[0029] The beneficial effects of the above-mentioned technical solutions provided in the embodiments of the present invention include at least the following:

[0030] This invention provides a continuous performance testing system and method for graded cementing tools. The testing system uses a preset method to pre-place gravity plugs and closing rubber plugs in the cavity of the rubber plug container, releases them step by step, and continuously tests them. It can continuously test the opening pressure, closing pressure, and pressure bearing capacity of graded cementing tools of different sizes, solving the technical problems of discontinuous testing, cumbersome operation, long testing cycle, and low efficiency of existing systems or testing tools.

[0031] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0032] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0033] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0034] Figure 1This is one of the (overall) structural diagrams of the staged cementing tool continuous performance testing system provided in this embodiment of the invention;

[0035] Figure 2 This is the second structural diagram of the staged cementing tool continuous performance testing system (test preparation stage) provided in this embodiment of the invention;

[0036] Figure 3 This is the third structural diagram of the staged cementing tool continuous performance testing system (opening test stage) provided in this embodiment of the invention;

[0037] Figure 4 This is the fourth structural diagram of the staged cementing tool continuous performance testing system (closed-up test stage) provided in this embodiment of the invention;

[0038] Figure 5 This is a structural diagram of the staged cementing tool provided in this embodiment of the invention;

[0039] Figure 6 This is a structural diagram of the stop lever assembly (initial state of the stop lever) provided in an embodiment of the present invention;

[0040] Figure 7 This is a structural diagram of the stop lever assembly (stop lever open state) provided in an embodiment of the present invention;

[0041] Figure 8 This is a flowchart of the continuous performance testing method for graded cementing tools provided in this embodiment of the invention;

[0042] 1-Fluid supply device; 2-Rubber stopper receiving device; 3-Test tool receiving cylinder; 4-Gravity plug; 5-Closing rubber stopper; 6-Connecting joint; 7-Locking connecting ring; 8-Lower joint; 9-Fixed bracket; 31-Heating belt; 32-Insulation layer; 33-Thermometer; 10-Tested cementing tool; 11-Storage tank; 12-Safety valve; 13-Testing pump; 14-Check valve; 15-Pressure gauge; 16-Throttle valve; 21-End cap; 22-Rubber stopper cavity component; 23-Stop rod assembly; 24- 61-Boss; 101-Tool body; 102-Close seat; 103-Close sleeve; 104-Open seat; 105-Tool lower connector; 106-First circulation hole; 107-Second circulation hole; 161-First throttle valve; 162-Second throttle valve; 163-Third throttle valve; 221-Through hole; 222-Mounting hole; 231-First stop lever assembly; 232-Second stop lever assembly; 241-First swivel joint; 242-Second swivel joint; 243-Third swivel joint. Detailed Implementation

[0043] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0044] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "far," "near," "front," and "rear," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] The inventors discovered during practical work that, firstly, due to limitations of indoor testing equipment, only one test could be performed at a time. After each test, the test connector needed to be disassembled to insert a gravity plug or close the rubber plug before proceeding to the next test, which was cumbersome and could easily damage the threads of the prototype. Secondly, if high-temperature testing was required, after each test, the tool needed to cool down before disassembly and reassembly could proceed to the next test, resulting in a long waiting period and low efficiency. In view of the above problems, this invention was proposed to provide a continuous performance testing system and method for graded cementing tools that overcomes or at least partially solves the aforementioned problems.

[0047] This invention provides a staged cementing tool continuous performance testing system, referring to... Figures 1-4As shown, the testing system may include: a liquid supply device 1, a rubber stopper receiving device 2, a test tool receiving cylinder 3, a gravity stopper 4, and a closing rubber stopper 5; wherein, the rubber stopper receiving device 2 includes: an end cap 21, a rubber stopper cavity 22, two stopper assemblies 23, and three unions 24; the end cap 21 is detachably connected to the upper end of the rubber stopper cavity 22; the rubber stopper cavity 22 has three through holes 221 in the vertical direction, and the three unions 24 are embedded in the through holes 221; two adjacent through holes in the rubber stopper cavity 22 in the vertical direction Two mounting holes 222 are provided between 221, and two stop rod assemblies 23 are installed in the mounting holes 222. The lower end of the rubber plug cavity 22 is detachably connected to the test tool receiving cylinder 3, which is used to receive the test stage cementing tool 10, and the lower end of the rubber plug cavity 22 is detachably connected to the upper end of the test stage cementing tool 10. In the untested state, the gravity plug 4 and the closing rubber plug 5 are located in the rubber plug cavity 22, and the gravity plug 4 and the closing rubber plug 5 are respectively limited by the stop rod of the stop rod assembly 23.

[0048] It should be noted that the staged cementing tool (staged cementing tool prototype) tested in this embodiment of the invention is existing equipment. To more clearly illustrate the testing process of the staged cementing tool in the testing system and method, the continuous performance test of the staged cementing tool is described here again. (Refer to...) Figure 5 As shown, the tested staged cementing tool 10 may include: a tool body 101, a tool lower connector 105 connected to the lower end of the tool body 101, and a closing sleeve 103 located inside the tool body 101, an opening seat 104 and a closing seat 102 located inside and below the closing sleeve 103, with the closing seat 102 located above the opening seat 104. The closing sleeve 103 has a first circulation hole 106, and the tool body 101 has a second circulation hole 107. In the initial state (untested state), the first circulation hole 106 is located above the second circulation hole 107. It should be further noted that in this embodiment, the various components within the tool body can be connected to the tool body via shear pins. Under pressure reaching a set condition, the shear pins are sheared to achieve sliding / lowering. This embodiment of the invention does not specifically limit this aspect.

[0049] Reference Figure 1 As shown, the three unions 24, from top to bottom, can be a first union 241, a second union 242, and a third union 243; the two stop lever assemblies 23, from top to bottom, can be a first stop lever assembly 231 and a second stop lever assembly 232, combined with... Figure 6 and Figure 7As shown, in this embodiment, the length of the stop lever in the stop lever assembly within the rubber stopper cavity 22 can be adjusted by rotating the turntable on the outside of the stop lever assembly. The aforementioned through hole can serve as the liquid inlet of the cavity, and a union-structured pipe connector can be fitted onto it for easy threaded connection with the throttle valve.

[0050] The testing process of the staged cementing tool continuous performance testing system described in this embodiment of the invention is as follows:

[0051] (1) Experimental preparation stage

[0052] Connect the cementing tool 10 to be tested to the lower end of the rubber plug cavity 22 of the rubber plug receiving device 2, and place the cementing tool 10 to be tested inside the tool receiving cylinder 3; open the end cap 21 of the rubber plug receiving device 2, open the second stop rod assembly 232 so that the stop rod of the second stop rod assembly 232 extends into the cavity of the rubber plug cavity 22, and put in the gravity plug 4; then open the first stop rod assembly 231 so that the stop rod of the first stop rod assembly 231 extends into the cavity of the rubber plug cavity 22, put in the closing rubber plug 5, and then close the end cap 21; finally connect the test pipeline and check the sealing of each valve.

[0053] (2) Test of opening circulation holes of the cementing tool under test

[0054] Open the second stop assembly 232 to disengage the stop lever in the second stop assembly 232 from the chamber of the rubber plug cavity 22 and release the gravity plug 4 so that the gravity plug 4 falls into the opening seat 104 of the cementing tool 10 under the action of gravity; close the throttle valve (first throttle valve 161) connected to the first union 241 of the rubber plug receiving device 2 and the throttle valve (third throttle valve 163) connected to the third union 243; open the fluid supply device 1 and inject fluid into the cementing tool 10 under the test through the throttle valve (second throttle valve 162) connected to the second union 242 of the rubber plug receiving device 2; pressurize; when the pressure reaches the opening pressure, the closing sleeve 103, closing seat 102 and opening seat 104 in the cementing tool 10 under the test move down so that the first circulation hole 106 on the closing sleeve 103 and the second circulation hole 107 on the tool body 101 in the cementing tool 10 under the test are aligned, and the opening pressure is recorded.

[0055] (3) Test of the closed circulation hole of the cementing tool under test

[0056] Close the throttle valves (second throttle valve 162 and third throttle valve 163) connected to the second union 242 and third union 243 at the lower part of the plug receiving device 2, respectively. Open the first stop rod assembly 231 so that the stop rod in the first stop rod assembly 231 exits the chamber of the plug receiving cavity 22 and releases the closing plug 5. Open the liquid supply device 1 and inject liquid into the tested stage cementing tool 10 through the throttle valve (first throttle valve 161) connected to the first union 241 at the upper part of the plug receiving device 2. The liquid pushes the closing plug 5 down and acts on the closing seat 102, pressurizing it. When the pressure reaches the closing pressure, the closing seat 102 drives the closing sleeve down so that the first circulation hole 106 and the second circulation hole 107 are staggered and the circulation holes are closed, and the closing pressure is recorded.

[0057] The continuous performance testing system for graded cementing tools provided in this embodiment of the invention uses a preset method to pre-place the gravity plug and the closing rubber plug in the cavity of the rubber plug container, releases them step by step and tests them continuously. There is no need to repeatedly disassemble and install them during the testing process. It can continuously test the opening pressure, closing pressure and pressure bearing capacity performance of graded cementing tools of different sizes, and solves the technical problems of discontinuous testing, cumbersome operation and long testing cycle and low efficiency of existing systems or testing tools.

[0058] In an optional embodiment, refer to Figures 1-4 As shown, the above-mentioned testing system may further include: a connecting joint 6 and a locking connecting ring 7 located between the rubber plug cavity 22 and the test tool receiving cylinder 3; the upper end of the connecting joint 6 is detachably connected to the rubber plug cavity 22; a boss 61 is provided in the middle of the connecting joint 6, and the locking connecting ring 7 is sleeved on the outside of the boss 61; the connecting joint 6 is detachably connected to the test tool receiving cylinder 3 through the boss 61 and the locking connecting ring 7; the lower end of the connecting joint 6 extends into the interior of the test tool receiving cylinder 3 and is detachably connected to the upper end of the test stage cementing tool 10.

[0059] The connecting joint and locking connecting ring described in the embodiments of the present invention can realize the detachable connection between the rubber plug cavity and the test tool housing, and the connecting joint can be used to detachably connect with the test grade cementing tool, so as to facilitate the stable installation of the test grade cementing tool and its sealed placement in the test tool housing.

[0060] In another specific embodiment, refer to Figures 1-4As shown, the upper end of the connecting joint 6 is threaded to the rubber plug cavity 22; the lower end of the connecting joint 6 is threaded to the upper end of the cementing tool 10 under test; the upper end of the boss 61 is provided with an external thread, the lower end of the locking connecting ring 7 is provided with an internal thread, and the upper end of the tool receiving cylinder 3 under test is provided with an external thread; the locking connecting ring 7 is nested on the outside of the boss 61 and the tool receiving cylinder 3 under test, and the connecting joint 6 and the cementing tool 10 under test are threaded together by the locking connecting ring 7.

[0061] In another alternative embodiment, refer to Figures 1-4 As shown, the above-mentioned testing system may further include: a lower connector 8, which is detachably connected to the lower end of the test tool receiving cylinder 3, for closing the lower end of the test tool receiving cylinder 3. In this embodiment, closing the lower end of the test tool receiving cylinder through the lower connector allows the liquid injected during the test to be discharged, so that after testing one prototype, other test prototypes can be repeatedly tested to achieve the purpose of multiple cyclic tests.

[0062] In another alternative embodiment, refer to Figures 1-4 As shown, the above-mentioned testing system may also include: a heating belt 31, an insulation layer 32, a temperature sensor (not shown in the figure), and a thermometer 33; the heating belt 31 is wrapped around the outside of the test tool receiving cylinder 3, the insulation layer 32 is wrapped around the outside of the heating belt 31, and the temperature sensor is located between the heating belt 31 and the insulation layer 32 and is electrically connected to the thermometer 33.

[0063] In this embodiment of the invention, by setting a heating belt and an insulation layer on the outside of the housing of the test tool, the housing of the test tool is heated at high temperature. This allows the test grade cementing tool (test prototype) to be tested at different temperatures to simulate the underground high-temperature environment and achieve the purpose of high-temperature testing.

[0064] It should be noted here that, in combination Figure 1 As shown, the test preparation stage of the test process of the continuous performance test system for graded cementing tools is adjusted accordingly. That is, before placing the graded cementing tool 10 to be tested, the first throttle valve 161 and the second throttle valve 162 are closed, the third throttle valve 163 is opened, the fluid supply device 1 is turned on and high-temperature heat transfer oil is injected into the housing 3 of the tool to be tested through the third throttle valve 163, and the heating belt 31 is turned on to slowly heat to the set temperature.

[0065] In another alternative embodiment, refer to Figures 1-4As shown, the closing plug 5 is located above the gravity plug 4. The gravity plug 4 is limited by the lower stop assembly 23, and the closing plug 5 is limited by the upper stop assembly 23. In this embodiment of the invention, the gravity plug 4 is limited by the stop in the second stop assembly 232, and the closing plug 5 is limited by the stop in the first stop assembly 231.

[0066] In another alternative embodiment, refer to Figures 1-4 As shown, the fluid supply device 1 may include: a storage tank 11, a safety valve 12, a pressure testing pump 13, a check valve 14, a pressure gauge 15, and three throttle valves 16; the storage tank 11, safety valve 12, pressure testing pump 13, check valve 14, and three throttle valves 16 are sequentially connected by pipelines, and the three throttle valves 16 are respectively connected to the union joint 24; the pressure gauge 15 is located on the pipeline between the check valve 14 and the three throttle valves 16. In this embodiment of the invention, the throttle valves can control the flow direction of the fluid, and the pressure gauges can record the pressure at each stage. In this embodiment of the invention, the fluid supply device can inject high-temperature heat transfer oil into the housing of the tool under test or inject liquid into the cementing tool under test.

[0067] In another alternative embodiment, refer to Figures 1-4 As shown, the above-mentioned testing system may further include: a fixed bracket 9; the test tool receiving cylinder 3 is mounted on the fixed bracket 9. In this embodiment, the fixed bracket serves as a support for the test tool receiving cylinder and the rubber stopper receiving device in the entire testing system, so as to support and fix the test tool receiving cylinder and the rubber stopper receiving device.

[0068] Based on the same inventive concept, this invention also provides a method for continuous performance testing of graded cementing tools. This method tests the graded cementing tool under test using the aforementioned continuous performance testing system for graded cementing tools, referring to... Figure 8 As shown, the testing method may include the following steps:

[0069] Step S81: Connect the cementing tool 10 to be tested to the lower end of the rubber plug cavity 22 of the rubber plug receiving device 2, and place the cementing tool 10 to be tested inside the tool receiving cylinder 3.

[0070] In this step, with the staged cementing tool continuous performance testing system including the connecting joint 6 and the locking connecting ring 7, the staged cementing tool 10 to be tested is connected to the lower end of the connecting joint 6, and the staged cementing tool 10 to be tested is placed inside the test tool receiving cylinder 3; and the locking connecting ring 7 is used to lock the connecting joint 6 to the rubber plug cavity 22.

[0071] Step S83, refer to Figure 2As shown, open the end cap 21 of the rubber stopper receiving device 2, open the lower stopper assembly 23 (second stopper assembly 232) so that the stopper in the lower stopper assembly 23 (second stopper assembly 232) extends into the cavity of the rubber stopper cavity 22, and insert the gravity stopper 4; open the upper stopper assembly 23 (first stopper assembly 231) so that the stopper in the upper stopper assembly 23 (first stopper assembly 231) extends into the cavity of the rubber stopper cavity 22, insert the closing rubber stopper 5 and close the end cap 21.

[0072] Step S85, refer to Figure 3 As shown, the lower stop assembly 23 (second stop assembly 232) is opened to allow the stop rod in the lower stop assembly 23 (second stop assembly 232) to exit the chamber of the rubber plug cavity 22 and release the gravity plug 4, so that the gravity plug 4 falls into the opening seat 104 of the cementing tool 10 under the action of gravity; the throttle valve 16 (first throttle valve 161) connected to the upper union 24 (first union 241) of the rubber plug receiving device 2 and the throttle valve 16 (third throttle valve 163) connected to the lower union (third union 243) are closed, opening... The test pump 13 of the liquid supply device 1 injects liquid into the cementing tool 10 under test through the throttle valve 16 (second throttle valve 162) connected to the middle union 24 (second union 242) of the rubber plug receiving device 2. When the pressure reaches the opening pressure, the closing sleeve 103, closing seat 102 and opening seat 104 in the cementing tool 10 under test move down so that the first circulation hole 106 on the closing sleeve 103 and the second circulation hole 107 on the tool body 101 in the cementing tool 10 under test are aligned, and the opening pressure is recorded.

[0073] Step S87, refer to Figure 4 As shown, the throttle valves 16 (second throttle valve 162 and third throttle valve 163) connected to the two lower unions 24 (second union 242 and third union 243) of the rubber plug receiving device 2 are closed, and the upper stop rod assembly 23 (first stop rod assembly 231) is opened to allow the stop rod in the upper stop rod assembly 23 (first stop rod assembly 231) to exit the chamber of the rubber plug receiving cavity 22 and release the closing rubber plug 5; the test pump 13 of the liquid supply device 1 is turned on and liquid is injected into the cementing tool 10 under test through the throttle valve 16 (first throttle valve 161) connected to the upper union 24 (first union 241) of the rubber plug receiving device 2. The liquid pushes the closing rubber plug 5 downward and acts on the closing seat 102. When the pressure reaches the closing pressure, the closing seat 102 drives the closing sleeve 103 downward so that the first circulation hole 106 and the second circulation hole 107 are misaligned and the closing pressure is recorded.

[0074] In another optional embodiment, after inserting the closing rubber stopper 5 and closing the end cap 21, the following steps may be included: Step S84, closing the throttle valves 16 (first throttle valve 161 and second throttle valve 162) connected to the upper two unions 24 (first union 241 and second union 242) of the rubber stopper receiving device 2, and opening the throttle valve 16 (third throttle valve 163) connected to the lower union 24 (third union 243) of the rubber stopper receiving device 2, and turning on the test pressure pump 13 of the liquid supply device 1 to inject high-temperature heat transfer oil into the test tool receiving cylinder 3 through the throttle valve 16 (third throttle valve 163) connected to the lower union 24 (third union 243), and then turning on the heating belt 31 and heating to the set temperature.

[0075] In another alternative embodiment, refer to Figure 7 As shown, after recording the closing pressure, the process may further include: step S88, continuing to inject liquid into the staged cementing tool 10 under test, pressurizing and testing the sealing performance of the staged cementing tool 10 under test after the circulation hole is closed.

[0076] The specific beneficial effects of the testing method provided in the embodiments of the present invention can be referred to the relevant description of the testing system, and will not be repeated here.

[0077] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. This disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims. Thus, if these modifications and variations of the invention fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A continuous performance testing system for graded cementing tools, characterized in that, include: Liquid supply device, rubber stopper receiving device, test tool receiving cylinder, gravity stopper and closing rubber stopper; The rubber plug receiving device includes: an end cap, a rubber plug cavity, two stopper assemblies, and three unions; the end cap is detachably connected to the upper end of the rubber plug cavity; the rubber plug cavity has three through holes in the vertical direction, and the three unions are embedded in the through holes; the rubber plug cavity has two mounting holes between two adjacent through holes in the vertical direction, and the two stopper assemblies are installed in the mounting holes; the lower end of the rubber plug cavity is detachably connected to the test tool receiving cylinder, the test tool receiving cylinder is used to receive the test stage cementing tool, and the lower end of the rubber plug cavity is detachably connected to the upper end of the test stage cementing tool; In the untested state, the gravity plug and the closing rubber plug are located within the rubber plug cavity, with the closing rubber plug positioned above the gravity plug. The gravity plug is limited by the lower stop assembly, and the closing rubber plug is limited by the upper stop assembly.

2. The testing system according to claim 1, characterized in that, Also includes: A connecting joint and a locking ring located between the rubber stopper cavity and the test tool receiving cylinder; The upper end of the connecting joint is detachably connected to the rubber stopper cavity. The connecting joint has a boss in the middle, and the locking connecting ring is sleeved on the outside of the boss. The connecting joint is detachably connected to the test tool receiving cylinder through the boss and the locking connecting ring. The lower end of the connecting joint extends into the interior of the test tool housing and is detachably connected to the upper end of the test graded cementing tool.

3. The testing system according to claim 2, characterized in that, The upper end of the connecting joint is threaded to the rubber plug cavity; the lower end of the connecting joint is threaded to the upper end of the tested graded cementing tool. The upper end of the boss is provided with an external thread, the lower end of the locking connecting ring is provided with an internal thread, and the upper end of the test tool receiving cylinder is provided with an external thread; the locking connecting ring is nested on the outside of the boss and the test tool receiving cylinder, and the connecting joint and the test grade cementing tool are threadedly connected through the locking connecting ring.

4. The testing system according to claim 1, characterized in that, Also includes: The lower connector is detachably connected to the lower end of the test tool receiving cylinder and is used to close the lower end of the test tool receiving cylinder.

5. The testing system according to any one of claims 1 to 4, characterized in that, Also includes: Heating belt, insulation layer, temperature sensor and thermometer; The heating band is wrapped around the outside of the housing of the test tool, the insulation layer is wrapped around the outside of the heating band, and the temperature sensor is located between the heating band and the insulation layer and is electrically connected to the thermometer.

6. The testing system according to claim 1, characterized in that, The liquid supply device includes: a liquid storage tank, a safety valve, a pressure testing pump, a check valve, a pressure gauge, and three throttle valves; The liquid storage tank, the safety valve, the pressure testing pump, the check valve, and the three throttle valves are connected in sequence through pipelines, and the three throttle valves are respectively connected to the union joint; the pressure gauge is located on the pipeline between the check valve and the three throttle valves.

7. The testing system according to any one of claims 1 to 4 or claim 6, characterized in that, Also includes: Fixed bracket; the test tool receiving cylinder is mounted on the fixed bracket.

8. A method for continuous performance testing of graded cementing tools, characterized in that, The continuous performance testing system for graded cementing tools according to any one of claims 1 to 7 tests the graded cementing tool under test, comprising: The cementing tool to be tested is connected to the lower end of the rubber plug cavity of the rubber plug receiving device, and the cementing tool to be tested is placed in the receiving cylinder of the tool to be tested. Open the end cap of the rubber stopper receiving device, open the lower stopper assembly so that the stopper in the lower stopper assembly extends into the cavity of the rubber stopper cavity, and insert the gravity stopper; open the upper stopper assembly so that the stopper in the upper stopper assembly extends into the cavity of the rubber stopper cavity, insert the closing rubber stopper and close the end cap; Open the lower stop assembly to allow the stop rod in the lower stop assembly to exit the chamber of the rubber plug cavity and release the gravity plug, so that the gravity plug falls into the opening seat of the cementing tool under test under gravity; close the throttle valve connected to the upper union and the throttle valve connected to the lower union of the rubber plug receiving device, open the test pump of the fluid supply device and inject fluid into the cementing tool under test through the throttle valve connected to the middle union of the rubber plug receiving device. When the pressure reaches the opening pressure, the closing sleeve, closing seat and opening seat in the cementing tool under test move down so that the first circulation hole on the closing sleeve and the second circulation hole on the tool body in the cementing tool under test are aligned, and the opening pressure is recorded. Close the throttle valves connected to the two unions at the bottom of the rubber plug receiving device, open the upper stop rod assembly to allow the stop rod in the upper stop rod assembly to exit the chamber of the rubber plug receiving component and release the closing rubber plug; turn on the pressure test pump of the liquid supply device and inject liquid into the cementing tool under test through the throttle valve connected to the union at the top of the rubber plug receiving device. The liquid pushes the closing rubber plug downward and acts on the closing seat. When the pressure reaches the closing pressure, the closing seat drives the closing sleeve downward so that the first circulation hole and the second circulation hole are misaligned and the closing pressure is recorded.

9. The test method according to claim 8, characterized in that, With the staged cementing tool continuous performance testing system including a connecting joint and a locking connecting ring, the staged cementing tool to be tested is connected to the lower end of the connecting joint, and the staged cementing tool to be tested is placed in the test tool receiving cylinder; and the locking connecting ring is used to lock the connecting joint to the rubber plug cavity.

10. The test method according to claim 8 or 9, characterized in that, After inserting the closing rubber plug and closing the end cap, the process further includes: Close the throttle valves connected to the two upper unions of the rubber stopper receiving device, open the throttle valve connected to the lower union of the rubber stopper receiving device, turn on the test pump of the liquid supply device and inject high-temperature heat transfer oil into the receiving cylinder of the test tool through the throttle valve connected to the lower union, then turn on the heating belt and heat to the set temperature.

11. The test method according to claim 8 or 9, characterized in that, After recording the shutdown pressure, it also includes: Continue injecting liquid into the tested staged cementing tool, pressurize it, and test the sealing performance of the tested staged cementing tool after the circulation hole is closed.

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