A test device and method for testing the fluid conductivity of a grommet seal

Abstract

The application discloses a kind of test devices for testing the electric conductivity of sealing fluid isolation of rubber ring, comprising: upper joint, lower joint, shell, insulation test seal head, test pin and insulation test sheath;Upper joint and lower joint are inserted into shell, and upper joint and lower joint are arranged along the shell axial interval;Insulation test seal head is located in shell and insulation test sheath is sleeved between shell and insulation test seal head;Wherein, insulation test sheath, shell and insulation test seal head are concentrically arranged;One end of test pin is inserted into shell and insulation test sheath;The other end of test pin extends to the outside of shell.The application also discloses a kind of test method for testing the electric conductivity of sealing fluid isolation of rubber ring.The test device of the application is simple to disassemble, easy to operate, can provide more reliable data support for the optimization adjustment of tool sealing assembly design scheme, avoid the waste of funds caused by blind processing, provide theoretical guarantee for next step research and development of downhole docking device.

Description

Technical Field

[0001] This invention relates to the field of oilfield water injection tools, specifically to a test apparatus for testing the ability of rubber ring seals to isolate fluid conductivity and a method for testing the ability of rubber ring seals to isolate fluid conductivity using the test apparatus. Background Technology

[0002] Water injection in oilfields involves using injection equipment to inject qualified water from injection wells into the oil-bearing formation to maintain formation pressure. Water injection is a crucial method for replenishing formation energy and enhancing oil recovery during oilfield development. The level of water injection well management technology directly determines the success of oilfield development and, consequently, the lifespan of the oilfield.

[0003] Currently, in conventional cable-operated intelligent injection systems, armored cables are required above the tool section to ensure communication and power supply to the ground. These armored cables are susceptible to breakage or insulation damage, which could lead to short circuits or open circuits in the entire injection string, resulting in repeated work. Furthermore, when lifting the injection string, the armored cables are cumbersome to disassemble due to the need for cable clamps to secure them to the tubing, leading to low labor efficiency.

[0004] The above phenomena are the main reasons for the low success rate of intelligent injection sub-grouting construction and the long well occupation and construction periods. Therefore, it is necessary to study the in-pipe wet-joint cable-controlled intelligent injection sub-grouting process and to develop downhole cable connectors and their supporting tools. The connector adopts the wet-joint principle, sealing both sides of the conductive material with a sealing ring on the insulating material to form a wet-joint space. The conductive materials contact each other in this space to complete power supply and data transmission. During the research and development process, it is necessary to optimize the combination of insulating materials and sealing components, and determine the final design scheme based on the test results. If a prototype is manufactured for each combination method, it will lead to a large waste of materials and funds.

[0005] Currently, there is no corresponding experimental device to simulate wet docking conditions to provide theoretical support for the design of docking devices, and this problem urgently needs to be solved. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a test apparatus for testing the fluid conductivity isolation properties of rubber ring seals and a method for testing the fluid conductivity isolation properties of rubber ring seals using this test apparatus.

[0007] The present invention discloses a test device for testing the fluid conductivity isolation of a rubber ring seal, comprising: an upper connector, a lower connector, a housing, an insulation test sealing head, a test pin, and an insulation test outer sleeve;

[0008] The upper connector and the lower connector are inserted into the housing, and the upper connector and the lower connector are spaced apart along the axial direction of the housing;

[0009] One end of the housing is sealed to the upper connector, and the other end is sealed to the lower connector;

[0010] The insulation test sealing head is located inside the housing, and the insulation test outer sleeve is fitted between the housing and the insulation test sealing head; wherein, the insulation test outer sleeve, the housing, and the insulation test sealing head are concentrically arranged;

[0011] One end of the test pin is inserted into the housing and the insulating test jacket; the other end of the test pin extends to the outside of the housing.

[0012] Furthermore, the test apparatus also includes a pressure upper connector, which is a hollow tubular component; wherein the lower end of the pressure upper connector is threadedly connected to the upper end of the upper connector.

[0013] Furthermore, the shell is a hollow cylindrical shell;

[0014] The housing includes an outer shell and a cylindrical inner shell fitted inside the outer shell; wherein the outer shell and the inner shell are concentrically arranged, and the outer shell and the inner shell are partially connected;

[0015] A bridge-like channel is formed between the outer shell and the inner shell, and a semi-annular space is formed within the bridge-like channel; the semi-annular space extends along the axial direction of the shell.

[0016] The inner shell is located inside the outer shell, and extends to both ends of the outer shell to form an upper insertion port and a lower insertion port;

[0017] The lower end of the inner shell extends into the interior of the shell into a ring-shaped platform.

[0018] Furthermore, the lower end of the upper connector is inserted into the socket on the shell and extends to one end of the semi-annular space; the lower end of the upper connector is provided with a water-permeable hole so that liquid can enter the semi-annular space through the water-permeable hole.

[0019] Furthermore, the upper connector is provided with a rubber ring groove in the circumference for placing the sealing ring; after the upper connector is inserted into the housing, the sealing ring in the rubber ring groove contacts the housing to form a sealed connection.

[0020] Furthermore, the outer diameter of the end of the insulating test jacket is smaller than the outer diameter of the middle portion between the ends of the insulating test jacket; the middle portion and the end form a first stepped surface;

[0021] When the insulation test jacket is placed inside the housing, the first stepped surface is placed on the annular platform.

[0022] Furthermore, an annular boss extends from the upper end of the insulation test sealing head, and the annular boss is located at the upper end of the insulation test outer sleeve when the insulation test sealing head and the insulation test outer sleeve are assembled.

[0023] The upper and lower ends of the insulation test sealing head are provided with rubber ring grooves for placing the sealing ring, so that the insulation test sealing head is sealed to the insulation test outer sleeve.

[0024] Furthermore, a sealing piston is fitted onto the end of the insulating test jacket to form a sealed connection between the end of the insulating test jacket and the housing.

[0025] Furthermore, the sealing piston is an annular sealing plug, and both the inner and outer surfaces of the sealing piston are provided with rubber ring grooves for placing the sealing ring, so that a sealed connection is formed between the end of the insulating test jacket and the housing.

[0026] Furthermore, the upper end of the lower connector is inserted into the lower end of the outer shell of the housing and the upper end of the lower connector contacts one end of the semi-annular space; the upper end of the lower connector is provided with a water-permeable hole so that liquid can enter the lower connector from the semi-annular space through the water-permeable hole.

[0027] Furthermore, the lower connector is provided with a rubber ring groove in the circumference for placing the sealing ring; after the lower connector is inserted into the housing, the sealing ring in the rubber ring groove contacts the housing to form a sealed connection.

[0028] This invention also discloses a method for testing the fluid conductivity isolation property of a rubber ring seal, comprising the following steps:

[0029] 1) Assemble the test apparatus as described above and fill it with conductive fluid;

[0030] 2) After connecting the upper pressure fitting to the lower pressure fitting, pressurize the inside of the test device through the pressure testing pump so that the pressure is transmitted into the inside of the test device;

[0031] 3) Once the required test pressure is reached, one test head of the test gauge is connected to the test pin of the test device, and the other test head is connected to the housing of the test device to test the insulation between the insulation test sealing head and the insulation test outer jacket.

[0032] Further, step 1) includes:

[0033] A1: Connect the lower connector to the housing;

[0034] A2: Fit the sealing pistons onto both ends of the insulating test jacket and insert the insulating test jacket and sealing pistons into the housing;

[0035] A3: One end of the test pin is screwed into the insulating test jacket through the housing;

[0036] A4: Place the device assembled in step A3 vertically and pour conductive fluid into the insulating test jacket;

[0037] A5: Insert the insulation test sealing head into the insulation test outer sleeve, and connect the upper connector and the pressure upper connector.

[0038] Furthermore, step 2) also includes: turning on the pressure test pump so that the conductive fluid flows sequentially through the water inlet of the upper connector, the bridge channel of the shell and the water inlet of the lower connector, and finally fills the test device.

[0039] By adopting the above technical solution, the present invention has at least the following beneficial effects:

[0040] The test apparatus of the present invention is used to test the sealing performance of the rubber rings and can simulate downhole conditions to test whether a water film will form between the two sealing rubber rings (when the conductive fluid is water), thereby causing a short circuit;

[0041] The experimental device of this invention is easy to disassemble and operate, and can provide reliable data support for the optimization and adjustment of the tool sealing component design scheme, avoiding the waste of funds caused by blind processing, and providing theoretical support for the next step of developing downhole docking devices. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the structure of the test device for testing the fluid conductivity isolation property of the rubber ring seal according to an embodiment of the present invention;

[0044] Figure 2a and Figure 2b These are schematic diagrams and cross-sectional views of the upper connector of the test device according to an embodiment of the present invention;

[0045] Figure 3a , Figure 3b , Figure 3c and Figure 3d This is a schematic diagram of the housing structure according to an embodiment of the present invention;

[0046] Figure 4 This is a schematic diagram of the structure of the insulation test sealing head according to an embodiment of the present invention;

[0047] Figure 5 This is a schematic diagram of the structure of the sealing piston according to an embodiment of the present invention;

[0048] Figure 6a and Figure 6b This is a schematic diagram of the structure of the test pin according to an embodiment of the present invention;

[0049] Figure 7 This is a schematic diagram of the lower connector structure according to an embodiment of the present invention;

[0050] Figure 8 This is a schematic diagram of the structure of the insulating test jacket according to an embodiment of the present invention.

[0051] [List of Labels in the Attached Image]

[0052] 1. Upper connector for pressure testing; 2. Upper connector for pressure testing; 3. O-ring seal; 4. Housing; 5. Insulation test sealing head; 6. Sealing piston; 7. Test pin; 8. Lower connector for pressure testing; 9. Insulation test outer jacket.

[0053] Rubber ring groove 2-1, water permeable hole 2-2, upper end of upper connector 2-3, lower end of upper connector 2-4, middle part of upper connector 2-5;

[0054] 4-1 pin hole, 4-2 bridge channel, 4-3 annular platform, 4-4 inner shell, 4-5 connecting part, 4-6 lower insertion port, 4-7 first inlet, 4-9 upper insertion port, 4-11 outer shell;

[0055] Annular boss 5-1, rubber ring groove 5-2;

[0056] 6-1 groove for rubber ring;

[0057] 7-1 Rubber ring groove, 7-2 Connecting buckle, 7-3 Conductive pin, 7-4 Tightening nut;

[0058] Water-permeable hole 8-1, rubber ring groove 8-2;

[0059] Insertion hole 9-1, middle part of insulating test jacket 9-2, lower end of insulating test jacket 9-3, upper end of insulating test jacket 9-4, first step surface 9-5;

[0060] T - upper end; B - lower end; Detailed Implementation

[0061] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to specific examples and the accompanying drawings.

[0062] It should be noted that all uses of "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of the present invention. Subsequent embodiments will not explain this in detail.

[0063] See Figure 1 As shown, this embodiment provides a test device for testing the conductivity of a rubber ring seal insulating fluids, including: an upper connector 2, a lower connector 8, a housing 4, an insulation test sealing head 5, a test pin 7, and an insulation test outer jacket 9;

[0064] The upper connector 2 and the lower connector 8 are inserted into the housing 4, and the upper connector 2 and the lower connector 8 are spaced apart along the axial direction of the housing 4;

[0065] One end of the housing 4 is sealed to the upper connector 2, and the other end is sealed to the lower connector 8;

[0066] The insulation test sealing head 5 is fitted inside the housing 4 and the insulation test outer sleeve 9 is fitted between the housing 4 and the insulation test sealing head 5; wherein the insulation test outer sleeve 9, the housing 4 and the insulation test sealing head 5 are arranged concentrically.

[0067] One end of the test pin 7 is inserted into the housing 4 and the insulating test jacket 9; the other end of the test pin 7 extends to the outside of the housing 4.

[0068] Please continue to refer to Figure 1 The test apparatus also includes a pressure upper connector 1, which is a hollow tubular component; wherein, the lower end of the pressure upper connector 1 is threadedly connected to the upper end of the upper connector 2.

[0069] Specifically, the upper connector 2 is inserted into the upper end of the housing 4, and the lower connector 8 is inserted into the lower end of the housing 4; the upper connector 2 and the lower connector 8 are spaced apart along the axial direction of the housing 4. One end of the test pin 7 is first inserted into the side wall of the housing 4, and then into the side wall of the insulating test jacket 9. The other end of the test pin 7 extends out of the outer side of the housing 4 to facilitate connection with the test head of the megohmmeter.

[0070] Specifically, the upper pressure connector 1 is a hollow tubular component, and the protruding part on the side is a hollow cylindrical component. The upper pressure connector 1 and the upper connector 2 are connected by a threaded connection. After the upper pressure connector 1 is connected to the lower pressure connector 8 through the protruding part on the side, pressure is applied by a pump, allowing the pressure to be transmitted into the interior of the testing device.

[0071] It should be noted that the upper connector 2 of the test apparatus is the upper part, and the lower connector 8 is the lower part. In the following descriptions, the terms "upper end," "lower end," "upper part," and "lower part" for various components will all be used in this context. Figure 1 The orientation of the structure shown is described, specifically, arrow T indicates the upper end; arrow B indicates the lower end.

[0072] In an optional embodiment, the shell 4 is a hollow cylindrical shell 4; the shell 4 includes an outer shell 4-11 and a cylindrical inner shell 4-4 fitted inside the outer shell 4-11; wherein the outer shell 4-11 and the inner shell 4-4 are concentrically arranged and partially connected; a bridge-type channel 4-2 is formed between the outer shell 4-11 and the inner shell 4-4, and a semi-annular space is formed within the bridge-type channel 4-2; the semi-annular space extends axially along the shell 4; the upper end of the inner shell 4-4 is shorter than the upper end of the outer shell 4-11; the lower end of the inner shell 4-4 is shorter than the lower end of the outer shell 4-11; and the lower end of the inner shell 4-4 extends into the shell 4 to form an annular platform 4-3.

[0073] Specifically, such as Figures 3a-3d The shell 4 shown is a hollow cylindrical shell 4. In other preferred embodiments, shells 4 of other shapes that can achieve the technical effects of the present invention are also included within the scope of the present invention.

[0074] Specifically, such as Figure 3b As shown, the housing 4 includes a cylindrical outer shell 4-11 and a cylindrical inner shell 4-4 fitted inside the outer shell 4-11; the outer shell 4-11 and the inner shell 4-4 are concentrically arranged, and the outer diameter of the inner shell 4-4 is smaller than the inner diameter of the outer shell 4-11. The inner shell 4-4 and the outer shell 4-11 are connected by a connecting part 4-5, so that the inner shell 4-4 and the outer shell 4-11 are connected as a whole. A bridge-type channel 4-2 (e.g., ...) is also formed between the inner shell 4-4 and the outer shell 4-11. Figure 3d As shown, the bridge channel 4-2 is an axially extending space between the inner shell 4-4 and the outer shell 4-11, extending axially along the inner shell 4-4. Therefore, the bridge channel 4-2 includes a first inlet 4-7 (e.g., Figure 3c (Shown) and a first outlet (not shown). The bridge channels 4-2 form a semi-annular space that can be filled with conductive fluid when it is filled. In this embodiment, there are two bridge channels 4-2. In other preferred embodiments, the number of bridge channels 4-2 can be adapted.

[0075] Specifically, such as Figure 3c As shown, the lower end of the inner shell 4-4 extends into the housing 4 with an annular platform 4-3, while the lower end of the inner shell 4-4 has no other structure. The purpose of the annular platform 4-3 is to limit the insulating test jacket 9 inserted into the housing 4, so that the insulating test jacket 9 will not move downward and detach from the housing 4.

[0076] Specifically, such as Figure 3aAs shown, there is a pin hole 4-1 in the middle of the outer wall of the outer shell 4-11 of the housing 4. The pin hole 4-1 passes through the outer shell 4-11 and the inner shell 4-4, providing a connection channel for connecting the test pin 7, so that one of the test pins 7 can be inserted into the housing 4 and connected to the insulating test jacket 9.

[0077] Specifically, such as Figure 3c As shown, the upper end of the inner shell 4-4 is shorter than the upper end of the outer shell 4-11, thus forming an upper insertion port 4-9 at the upper end of the outer shell 4; the lower end of the inner shell 4-4 is shorter than the lower end of the outer shell 4-11, thus forming a lower insertion port 4-6 at the lower end of the outer shell 4.

[0078] The lower connector 8 is connected to the housing 4 by a threaded connection.

[0079] In an optional embodiment, the lower end of the upper connector is inserted into the upper end of the outer shell 4-11 of the housing 4, and the lower end of the upper connector contacts one end of the semi-annular space; a water-permeable hole 2-2 is provided at the lower end of the upper connector so that liquid can enter the semi-annular space through the water-permeable hole 2-2. The upper connector 2 is circumferentially provided with a rubber ring groove 2-1 for placing the sealing ring; after the upper connector 2 is inserted into the housing 4, the sealing ring in the rubber ring groove 2-1 contacts the housing 4 to form a sealed connection.

[0080] Specifically, such as Figure 2b As shown, the upper connector 2 is a cylindrical hollow component and includes an upper end 2-3, a lower end 2-4, and a middle portion 2-5 connecting the upper end 2-3 and the lower end 2-4. The outer diameters of both the upper end 2-3 and the lower end 2-4 are smaller than the outer diameter of the middle portion 2-5. In this embodiment, as... Figure 2a As shown, a rubber ring groove 2-1 is provided in the middle of the upper connector for placing an O-ring seal 3. In other preferred embodiments, the number of rubber ring grooves 2-1 can be two or more. In this embodiment, the lower end 2-4 of the upper connector has six water-permeable holes 2-2 for water permeation. In other preferred embodiments, the number of water-permeable holes 2-2 can be changed, for example, by increasing or decreasing the number of water-permeable holes 2-2 according to the required water permeability, water permeability rate, or the size of the upper connector 2.

[0081] Specifically, after the upper connector 2 is inserted into the upper insertion port 4-9 of the housing 4, the sealing ring in the rubber ring groove 2-1 contacts the inner wall of the housing 4 to form a sealed connection.

[0082] In an optional embodiment, the upper end of the lower connector 8 is inserted into the lower end of the outer shell 4-11 of the housing 4, and the upper end of the lower connector 8 contacts one end of the semi-annular space; a water-permeable hole 8-1 is provided at the upper end of the lower connector 8 so that liquid can enter the lower connector 8 from the semi-annular space through the water-permeable hole 8-1. A rubber ring groove 8-2 for placing a sealing ring is provided circumferentially for the lower connector 8; after the lower connector 8 is inserted into the housing 4, the sealing ring in the rubber ring groove 8-2 contacts the housing 4 to form a sealed connection.

[0083] Specifically, such as Figure 7 As shown, the lower connector 8 has a structure basically the same as the upper connector 2. The lower connector 8 is a cylindrical hollow component and includes an upper end, a lower end, and a middle section connecting the upper and lower ends. The outer diameters of the upper and lower ends of the lower connector 8 are both smaller than the outer diameter of the middle section of the lower connector 8. In this embodiment, a rubber ring groove 8-2 is provided in the middle section of the lower connector 8 for placing an "O"-ring seal 3. In other preferred embodiments, the number of rubber ring grooves 8-2 can be two or more. In this embodiment, the upper part of the lower connector 8 has six water-permeable holes 8-1 for allowing conductive fluid to pass through. The water-permeable holes 8-1 allow conductive fluid to enter the internal cavity of the lower connector 8, ultimately filling the entire sealed space with conductive fluid.

[0084] In other preferred embodiments, the number of permeable holes 8-1 can be changed, for example by increasing or decreasing the number of permeable holes 8-1 according to the required water permeability, water permeability rate or the size of the lower connector 8.

[0085] In an optional embodiment, the outer diameter of the end of the insulating test jacket 9 is smaller than the outer diameter of the middle part between the ends of the insulating test jacket 9; the middle part and the end form a first stepped surface; wherein, when the insulating test jacket 9 is placed inside the housing 4, the first stepped surface is placed on the annular platform 4-3.

[0086] Specifically, such as Figure 8 As shown, the insulating test jacket 9 is a hollow tubular component with a thinner outer wall at both ends and a thicker middle. The inner wall of the insulating test jacket 9 is a tubular structure with a uniform diameter. The middle part 9-2 of the insulating test jacket and the lower end 9-3 of the insulating test jacket form a first stepped surface 9-5, and the middle part 9-2 of the insulating test jacket and the upper end 9-4 of the insulating test jacket form a second stepped surface. During the assembly of the testing device, the insulating test jacket 9 is placed inside the housing 4, with the first stepped surface 9-5 contacting the annular platform 4-3, and gravity is used to hold the insulating test jacket 9 in place within the housing 4.

[0087] There is a pin hole in the middle of the insulating test jacket 9, which penetrates one side wall of the insulating test jacket 9. The pin hole is used to connect the test pin 7. The test pin 7 is connected through the thread inside the pin hole.

[0088] In an optional embodiment, an annular boss 5-1 extends from the upper end of the insulation test sealing head 5. The annular boss 5-1 is placed on the upper end of the insulation test outer sleeve 9 when the insulation test sealing head 5 is assembled with the insulation test outer sleeve 9. Both the upper and lower ends of the insulation test sealing head 5 are provided with rubber ring grooves 5-2 for placing the sealing ring, so that the insulation test sealing head 5 and the insulation test outer sleeve 9 are sealed together.

[0089] Specifically, such as Figure 4 As shown, the insulation test sealing head 5 is a solid cylindrical component, thicker at both ends and thinner in the middle. There are two rubber ring grooves 5-2 on the upper and lower outer sides of the insulation test sealing head 5, used to place O-rings, ensuring a sealed connection between the insulation test sealing head 5 and the insulation test outer sleeve 9. During testing, when the pressure pump injects conductive fluid, it ensures that no conductive fluid passes through the contact point between the insulation test sealing head 5 and the insulation test outer sleeve 9, maintaining insulation between them. The annular boss 5-1 on the top of the insulation test sealing head 5 is used to suspend and fix the insulation test sealing head 5. The annular boss 5-1 is engaged with the top of the insulation test outer sleeve 9 (e.g., ...). Figure 1 As shown in the figure, the insulation test sealing head 5 is held in place by gravity within the housing 4.

[0090] In an optional embodiment, a sealing piston 6 is fitted onto the end of the insulating test jacket 9 to form a sealed connection between the end of the insulating test jacket 9 and the housing 4. The sealing piston 6 is an annular sealing plug, and both the inner and outer surfaces of the sealing piston 6 are provided with rubber ring grooves 6-1 for placing the sealing ring, so that a sealed connection is formed between the end of the insulating test jacket 9 and the housing 4.

[0091] Specifically, such as Figure 5 As shown, the sealing piston 6 is annular, with two grooves 6-1 on both its inner and outer surfaces for holding O-rings 3. The two sealing pistons 6 are respectively fitted onto the upper and lower ends of the insulating test jacket 9. Since both the inner and outer surfaces of the sealing piston 6 are equipped with O-rings 3, the contact surfaces between the sealing piston 6 and the insulating test jacket 9 and the housing 4 are in sealed contact. This prevents conductive fluid from flowing between the housing 4 and the insulating test jacket 9, achieving the purpose of insulation between them. The insulating test jacket 9 and the insulating test sealing head 5 are in contact through the O-rings 3.

[0092] In the optional solutions of this embodiment, such as Figure 6a , Figure 6bThe test pin 7 shown has a conductive pin 7-3 on both the top and bottom. The front end of the pin is rounded. The lower part of the conductive pin 7-3 is a regular hexagonal tightening nut 7-4, which is used to cooperate with a wrench to make the test pin 7 and the insulating test jacket 9 tightly connected. The lower part of the tightening nut 7-4 has two rubber ring grooves 7-1, which are used to place the "O" ring sealing ring 3. Below the rubber ring grooves 7-1 is the connecting thread 7-2, which is used to connect the insulating test jacket 9.

[0093] This embodiment provides a method for testing the fluid conductivity isolation property of a rubber ring seal, including the following steps:

[0094] 1) Assemble the test apparatus and fill it with conductive fluid;

[0095] 2) After connecting the upper pressure fitting to the lower pressure fitting, pressurize the inside of the test device through the pressure testing pump so that the pressure is transmitted into the inside of the test device;

[0096] 3) Once the required test pressure is reached, one test head of the test gauge is connected to the test pin of the test device, and the other test head is connected to the housing of the test device to test the insulation between the insulation test sealing head and the insulation test outer jacket.

[0097] Preferably, the assembly test apparatus in step 1) includes:

[0098] A1: Connect the lower connector to the housing;

[0099] A2: Fit the sealing pistons onto both ends of the insulating test jacket and install the insulating test jacket and sealing pistons together into the housing;

[0100] A3: One end of the test pin is screwed into the insulating test jacket through the housing;

[0101] A4: Place the device assembled in step A3 vertically and manually pour conductive fluid into the insulating test jacket;

[0102] A5: Insert the insulation test sealing head into the insulation test outer sleeve, and connect the upper connector and the pressure upper connector;

[0103] The purpose of filling the annulus with conductive fluid before installing the insulation test sealing head is to ensure that the annulus between the insulation test sealing head and the insulation test outer sleeve is filled with conductive fluid.

[0104] Preferably, step 2) further includes: turning on the pressure testing pump and injecting conductive fluid into the device. The conductive fluid flows sequentially through the water permeable hole 2-2 of the upper connector 2, the bridge-type channel 4-2 of the housing 4, and the water permeable hole 8-1 of the lower connector 8. Preferably, the conductive fluid is water. In other preferred embodiments, other conductive fluids may also be used.

[0105] Water is used in the following exemplary description.

[0106] Before using this device, first connect the lower connector 8 to the housing 4, then fit the sealing pistons 6 onto both ends of the insulating test jacket 9, and install the insulating test jacket 9 into the housing 4. Next, screw one end of the test pin 7 into the screw hole of the insulating test jacket 9 through the housing 4. Place the device vertically, manually fill the insulating test jacket 9 with water, then install the insulating test sealing head 5 into the insulating test jacket. Connect the upper connector 2 and the pressure testing upper connector, tightening the threads with pipe wrenches. After connecting the pressure testing upper connector to the pressure testing lower connector, turn on the pressure testing pump and inject conductive fluid into the device. The conductive fluid flows through the water permeable hole 2-2 of the upper connector 2, the bridge-type channel 4-2 of the housing 4, and the water permeable hole 2-2 of the lower connector 8, finally filling the entire sealed space and continuing to pressurize to the required test pressure.

[0107] Because the O-ring is made of rubber, an insulating material, the housing 4, the insulation test sealing head 5, and the sealing piston 6 are insulators to each other. When the entire sealed space is filled with water, one test head of a megohmmeter is clamped to the test pin 7, and the other test head is placed on the body 4 to test the insulation between the insulation test sealing head 5 and the insulation test outer sleeve 9. If the resistance value shows "0", it indicates that a conductive water film exists between the insulation test sealing head 5 and the insulation test outer sleeve 9, making them no longer insulated; if the resistance value shows "∞", it indicates that no conductive water film has formed between the insulation test sealing head 5 and the insulation test outer sleeve 9, and they remain insulated.

[0108] The test apparatus of the present invention is used to test the sealing performance of the rubber rings and can simulate downhole conditions to test whether a water film will form between the two sealing rubber rings, thereby causing a short circuit.

[0109] The experimental device of this invention is easy to disassemble and operate, and can provide reliable data support for the optimization and adjustment of the tool sealing component design scheme, avoiding the waste of funds caused by blind processing, and providing theoretical support for the next step of developing downhole docking devices.

[0110] It should be noted that the components or steps in the above embodiments can be interchanged, substituted, added, or deleted. Therefore, the combinations formed by these reasonable permutations and transformations should also fall within the protection scope of this invention, and the protection scope of this invention should not be limited to the above embodiments.

[0111] The above are exemplary embodiments disclosed in this invention. The order of the disclosed embodiments is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. However, it should be noted that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the disclosed embodiments of this invention (including the claims) is limited to these examples. Various changes and modifications can be made without departing from the scope defined by the claims. The functions, steps, and / or actions of the methods according to the disclosed embodiments described herein do not need to be performed in any particular order. Furthermore, although the elements disclosed in the embodiments of this invention may be described or claimed individually, they may be understood as multiple unless explicitly limited to a singular.

[0112] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention (including the claims) is limited to these examples. Within the framework of the invention, technical features of the above embodiments or different embodiments can be combined, and many other variations of the different aspects of the invention as described above exist, which are not provided in the details for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A test apparatus for testing the conductivity of a rubber ring seal against fluid, characterized in that, include: Upper connector, lower connector, housing, insulation test sealing head, test pin, and insulation test outer sleeve; The upper connector and the lower connector are inserted into the housing, and the upper connector and the lower connector are spaced apart along the axial direction of the housing; One end of the housing is sealed to the upper connector, and the other end is sealed to the lower connector. The housing is a hollow cylindrical housing. The housing includes an outer shell and a cylindrical inner shell fitted inside the outer shell. The outer shell and the inner shell are concentrically arranged and partially connected. A bridge-type channel is formed between the outer shell and the inner shell, and a semi-annular space is formed within the bridge-type channel. The semi-annular space extends axially along the housing. The upper end of the lower connector is inserted into the lower end of the outer shell of the housing, and the upper end of the lower connector contacts one end of the semi-annular space. A water-permeable hole is provided at the upper end of the lower connector so that liquid can enter the lower connector from the semi-annular space through the water-permeable hole. A rubber ring groove for placing a sealing ring is provided circumferentially on the lower connector. After the lower connector is inserted into the housing, the sealing ring in the rubber ring groove contacts the housing to form a sealed connection. The insulation test sealing head is located inside the housing, and the insulation test outer sleeve is fitted between the housing and the insulation test sealing head; wherein, the insulation test outer sleeve, the housing, and the insulation test sealing head are concentrically arranged; One end of the test pin is inserted into the housing and the insulating test jacket; the other end of the test pin extends to the outside of the housing.

2. The test apparatus for testing the fluid conductivity isolation property of a rubber ring seal according to claim 1, characterized in that, The testing apparatus also includes a pressure-pressurizing upper connector, which is a hollow tubular component; and the lower end of the pressure-pressurizing upper connector is threadedly connected to the upper end of the upper connector.

3. The test apparatus for testing the fluid conductivity isolation property of a rubber ring seal according to claim 1, characterized in that, The inner shell is located inside the outer shell, and extends to both ends of the outer shell to form an upper insertion port and a lower insertion port; The lower end of the inner shell extends into the interior of the shell into a ring-shaped platform.

4. The test apparatus for testing the fluid conductivity isolation property of a rubber ring seal according to claim 3, characterized in that, The lower end of the upper connector is inserted into the upper socket and extends to one end of the semi-annular space; the lower end of the upper connector is provided with a water-permeable hole so that liquid can enter the semi-annular space through the water-permeable hole.

5. The test apparatus for testing the fluid conductivity isolation property of a rubber ring seal according to claim 4, characterized in that, The upper connector is provided with a rubber ring groove for placing the sealing ring in the circumferential direction; after the upper connector is inserted into the housing, the sealing ring in the rubber ring groove contacts the housing to form a sealed connection.

6. The test apparatus for testing the fluid conductivity isolation property of a rubber ring seal according to claim 3, characterized in that, The outer diameter of one end of the insulating test jacket is smaller than the outer diameter of the middle portion between the ends of the insulating test jacket; the middle portion and the end form a first stepped surface; When the insulation test jacket is placed inside the housing, the first stepped surface is placed on the annular platform.

7. The test apparatus for testing the fluid conductivity isolation property of a rubber ring seal according to claim 6, characterized in that, An annular protrusion extends from the upper end of the insulation test sealing head, and the annular protrusion is located at the upper end of the insulation test outer sleeve when the insulation test sealing head and the insulation test outer sleeve are assembled. The upper and lower ends of the insulation test sealing head are provided with rubber ring grooves for placing the sealing ring, so that the insulation test sealing head is sealed to the insulation test outer sleeve.

8. The test apparatus for testing the fluid conductivity isolation property of a rubber ring seal according to claim 6, characterized in that, A sealing piston is fitted at the end of the insulating test jacket to form a sealed connection between the end of the insulating test jacket and the housing.

9. The test apparatus for testing the fluid conductivity isolation property of a rubber ring seal according to claim 8, characterized in that, The sealing piston is an annular sealing plug, and both the inner and outer surfaces of the sealing piston are provided with rubber ring grooves for placing the sealing ring, so that a sealed connection is formed between the end of the insulating test jacket and the housing.

10. A method for testing the conductivity of a rubber ring seal against fluid, characterized in that, Includes the following steps: 1) Assemble the test apparatus as described in any one of claims 1-9 and fill it with conductive fluid; 2) After connecting the upper pressure fitting to the lower pressure fitting, pressurize the inside of the test device through the pressure testing pump so that the pressure is transmitted into the inside of the test device; 3) Once the required test pressure is reached, one test head of the test gauge is connected to the test pin of the test device, and the other test head is connected to the housing of the test device to test the insulation between the insulation test sealing head and the insulation test outer jacket.

11. The method for testing the fluid conductivity isolation property of a rubber ring seal according to claim 10, characterized in that, Step 1) includes: A1: Connect the lower connector to the housing; A2: Fit the sealing pistons onto both ends of the insulating test jacket and insert the insulating test jacket and sealing pistons into the housing; A3: One end of the test pin is screwed into the insulating test jacket through the housing; A4: Place the device assembled in step A3 vertically and pour conductive fluid into the insulating test jacket; A5: Insert the insulation test sealing head into the insulation test outer sleeve, and connect the upper connector and the pressure upper connector.

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