High-temperature and high-pressure testing shaft with replaceable inner pipe
By designing a replaceable inner tube type high temperature and high pressure test wellbore, the combination of the center rod and the conversion joint is used to solve the problem of strong specificity of the existing test equipment, and the unified testing of a variety of downhole tools is achieved, and the flexibility and efficiency of the test equipment are improved.
Patent Information
- Application Number
- CN202311598410.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-28
- Publication Date
- 2025-05-30
AI Technical Summary
The existing test equipment has the problem of strong specificity and cannot use a set of test equipment to perform performance testing of multiple downhole tools.
A replaceable inner tube type high temperature and high pressure test wellbore is designed. Through the combination of the center rod and the conversion joint, it can be used to test the underground tools of different sizes. There is a cavity between the wellbore and the underground tool, which supports multiple pressurization methods.
It realizes unified testing of downhole tools of different sizes, saving design and R&D costs, and improving the efficiency and flexibility of testing equipment.
Smart Images
Figure CN120063674A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of oil and gas industry drilling and production operations, and in particular to a replaceable inner tube type high-temperature and high-pressure test wellbore. Background Art
[0002] With the development of the oil and gas industry, the focus of oil and gas exploration and development has gradually shifted to deep wells and ultra-deep wells. The main technologies of wellbore engineering are developing in the direction of drilling deeper, faster, and safer. The key is to research and develop tools that can withstand high temperatures and high pressures, and to develop downhole tools with high temperature and high pressure resistance, large torque, and long life. Conducting indoor tests and evaluations of downhole tools can provide scientific test data for the design and research and development of downhole tools, timely discover problems existing in the tools, and ensure the quality and safety of downhole tools.
[0003] There are many specifications and models of downhole tools. Some downhole tools of different sizes need to be matched with corresponding size test equipment for testing. In addition, some downhole tools with slips will cause damage to the inner wall of the test equipment during testing. After several repeated tests, new test equipment needs to be replaced, which greatly increases the construction cost.
[0004] Such as Figure 1 shown, the existing test equipment is a sleeve customized according to the size of the downhole tool. The downhole tool to be tested is placed into the sleeve through the upper opening, and then an external device is used to pressurize and heat the sleeve; a corresponding sleeve needs to be customized for each type of downhole tool tested.
[0005] In summary, the existing test equipment has strong specificity and cannot use a set of test equipment to test the performance of multiple downhole tools. Summary of the Invention
[0006] The present invention provides a replaceable inner tube type high-temperature and high-pressure test wellbore to alleviate the problem that the existing test equipment has strong specificity and cannot use a set of test equipment to test the performance of multiple downhole tools.
[0007] In order to alleviate the above technical problems, the technical solution provided by the present invention lies in:
[0008] A replaceable inner tube type high-temperature and high-pressure test wellbore includes a test device; the test device includes a central rod, a transition joint, and a wellbore; the transition joint is arranged inside the wellbore; the central rod is arranged inside the wellbore and extends out from the upper part of the wellbore; the upper part of the transition joint is inserted into the central rod; the lower part of the transition joint is inserted into the downhole tool; there is a cavity between the wellbore and the downhole tool.
[0009] Furthermore, the test device further includes a head arranged at the upper part of the wellbore and a sealing plug arranged at the lower part of the wellbore; the central rod is inserted into the head; the head is inserted into the wellbore through a clamp; the sealing plug is inserted into the wellbore through a threaded lock ring.
[0010] Further, an electromagnetic heating sleeve is provided on the outer wall of the wellbore.
[0011] Further, the test device further includes a first pressure port, a second pressure port, and a third pressure port; the first pressure port and the second pressure port are in communication with the cavity and are used to apply pressure to the outside of the downhole tool; the third pressure port is provided on the upper part of the central rod and is used to apply pressure to the inside of the downhole tool.
[0012] Further, the central rod and the adapter are vertically through.
[0013] Further, a protective tube is further provided in the cavity between the central rod and the wellbore; the upper part of the protective tube has a protruding end; the protruding end is clamped with the table surface on the upper part of the wellbore.
[0014] Further, the outer wall of the protective tube has a boss extending outward; the boss is slidably connected to the inner wall of the wellbore.
[0015] Further, the head is provided with a coolant inlet and a coolant outlet; there is a cavity at the connection between the head and the wellbore; the coolant flows through the coolant inlet, the cavity, and the coolant outlet in sequence.
[0016] Further, the test device further includes a temperature sensor; the temperature sensor is inserted into the lower part of the sealing plug and extends upward from the sealing plug.
[0017] A test system includes the replaceable inner-tube type high-temperature and high-pressure test wellbore described above.
[0018] The beneficial effects of the present invention are analyzed as follows:
[0019] A replaceable inner-tube type high-temperature and high-pressure test wellbore includes a test device; the test device includes a central rod, an adapter, and a wellbore; the adapter is arranged inside the wellbore; the central rod is arranged inside the wellbore and extends out from the upper part of the wellbore; the upper part of the adapter is inserted into the central rod; the lower part of the adapter is inserted into the downhole tool; there is a cavity between the wellbore and the downhole tool.
[0020] Put the downhole tool to be tested into the wellbore, and then connect the central rod with the downhole tool through the adapter. After the connection of the downhole tool is completed, subsequent test experiments can be carried out.
[0021] The method of connecting the downhole tool with the central rod by using the adapter can install various downhole tools with different sizes in the test device of this solution for test experiments, without designing special test tools for different downhole tools, saving the costs of design and research and development. Description of the Drawings
[0022] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the related art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0023] Figure 1 Is a cross-sectional schematic diagram of the prior art;
[0024] Figure 2 Is a cross-sectional schematic diagram of the present invention;
[0025] Figure 3 Is a cross-sectional schematic diagram of a downhole tool installed;
[0026] Figure 4 Is Figure 2 A partial enlarged schematic diagram of A in
[0027] Figure 5 Is Figure 2 A partial enlarged schematic diagram of B in
[0028] Figure 6 Is an axonometric schematic diagram of a clamp.
[0029] Icon:
[0030] 100 - Test device; 110 - Central rod; 111 - Third pressure port; 120 - Adapter; 130 - Wellbore; 131 - First pressure port; 132 - Second pressure port; 133 - Tabletop; 140 - Head; 141 - Clamp; 142 - Coolant inlet; 143 - Coolant outlet; 150 - Sealing plug; 151 - Threaded lock ring; 160 - Electromagnetic heating sleeve; 170 - Protection tube; 171 - Raised end; 172 - Boss; 180 - Temperature sensor;
[0031] 200 - Downhole tool. Specific embodiments
[0032] Example 1
[0033] Existing test equipment has strong specificity and cannot use a set of test equipment to perform performance tests on multiple downhole tools 200.
[0034] In view of this, the present invention provides a replaceable inner-tube type high-temperature and high-pressure test wellbore, including a test device 100; the test device 100 includes a central rod 110, a conversion joint 120, and a wellbore 130; the conversion joint 120 is arranged inside the wellbore 130; the central rod 110 is arranged inside the wellbore 130 and extends from the upper part of the wellbore 130; the upper part of the conversion joint 120 is inserted into the central rod 110; the lower part of the conversion joint 120 is inserted into the downhole tool 200; there is a cavity between the wellbore 130 and the downhole tool 200.
[0035] Place the downhole tool 200 to be tested into the wellbore 130, and then connect the central rod 110 to the downhole tool 200 through the conversion joint 120. After the connection of the downhole tool is completed, subsequent test experiments can be carried out.
[0036] The method of using the conversion joint 120 to connect the downhole tool 200 to the central rod 110 can install various downhole tools 200 with different sizes in the test device 100 of this solution for test experiments, without designing special test tools for different downhole tools, saving the costs of design and research and development.
[0037] The following will combine Figures 2 to 6 to describe in detail the shape and structure of the replaceable inner-tube type high-temperature and high-pressure test wellbore provided in this embodiment:
[0038] The replaceable inner-tube type high-temperature and high-pressure test wellbore provided by the present invention includes a test device 100; the test device 100 includes a central rod 110, a conversion joint 120, and a wellbore 130; the conversion joint 120 is arranged inside the wellbore 130; the central rod 110 is arranged inside the wellbore 130 and extends from the upper part of the wellbore 130; the upper part of the conversion joint 120 is inserted into the central rod 110; the lower part of the conversion joint 120 is inserted into the downhole tool 200; there is a cavity between the wellbore 130 and the downhole tool 200.
[0039] Specifically, in order to improve the sealing effect, the conversion joint 120 and the downhole tool 200 are connected by a tapered pipe thread; the wellbore 130 is made of high-temperature and high-pressure resistant steel.
[0040] Regarding the shape and structure of the test device 100, as Figure 2 、 Figure 3 and Figure 4 shown:
[0041] The test device 100 further includes a head 140 arranged at the upper part of the wellbore 130 and a sealing plug 150 arranged at the lower part of the wellbore 130; the central rod 110 is inserted into the head 140; the head 140 is inserted into the wellbore 130 through a clamp 141; the sealing plug 150 is inserted into the wellbore 130 through a threaded lock ring 151.
[0042] Specifically, the head 140 is made of high temperature and high pressure resistant steel; Figure 2 and Figure 4 As shown, in order to improve the sealing effect of the connection, a plurality of annular sealing rings are further provided at the connection between the end cap 140 and the wellbore 130. The outer walls of the end cap 140 and the wellbore 130 are provided with protrusions extending outward. The clamp 141 is composed of two annular bodies separated in the radial direction. The inner wall of the clamp 141 is hollow and provided with a groove extending outward. In the connected state, the groove of the clamp 141 is clamped with the protrusion of the end cap 140 and the wellbore 130, and the two annular bodies are fastened by screws provided on the side of the clamp 141, thereby locking the end cap 140 and the wellbore 130.
[0043] like Figure 2 As shown, the sealing plug 150 is inserted into the bottom of the wellbore 130, the threaded locking ring 151 is arranged between the sealing plug 150 and the wellbore 130, the threaded locking ring 151 is connected to the wellbore 130 through threads, and the upper part of the sealing plug 150 is provided with a table extending outward, and in the connected state, the table of the sealing plug 150 is in close contact with the inner wall of the wellbore 130;
[0044] In order to improve the sealing effect, a sealing ring is further provided between the lower part of the table and the upper part of the threaded locking ring 151 and between the center rod 110 and the head 140;
[0045] In order to prevent the threaded locking ring 151 from loosening, a lifting ring is further provided at the lower portion of the threaded locking ring 151 , and the lifting ring is threadedly connected to the lower portion of the sealing plug 150 . After the lifting ring is locked, the lifting ring is in close contact with the threaded locking ring 151 .
[0046] like Figure 2 and Figure 3 As shown, an electromagnetic heating sleeve 160 is provided on the outer wall of the wellbore 130 .
[0047] Specifically, the electromagnetic heating sleeve 160 is disposed around the wellbore 130 , and is powered by an external AC power supply. In order to enhance the effect of heat conduction, the inner wall of the electromagnetic heating sleeve 160 is in close contact with the outer wall of the wellbore 130 .
[0048] like Figure 5 and Figure 6 As shown, the testing device 100 also includes a first pressurizing port 131, a second pressurizing port 132 and a third pressurizing port 111; the first pressurizing port 131 and the second pressurizing port 132 are connected to the cavity and are used to apply pressure to the outside of the downhole tool; the third pressurizing port 111 is arranged on the upper part of the center rod 110, and is used to apply pressure to the inside of the downhole tool; the center rod 110 and the conversion joint 120 are connected up and down.
[0049] Specifically, the first pressure port 131 is arranged at the connection between the upper part of the wellbore 130 and the head 140. The lower part of the head 140 has a groove communicating with the first pressure port 131 (due to the perspective in the figure, the groove is not shown). The liquid enters the cavity through the groove from the first pressure port 131.
[0050] The second pressure port 132 is arranged at the lower part of the wellbore 130, and the second pressure port 132 communicates with the wellbore 130.
[0051] The third pressure port 111 is arranged at the upper part of the central pipe. The fluid injected from the third pressure port 111 flows through the adapter 120 to the inside of the downhole tool 200.
[0052] The purpose of doing this is that due to the variety of downhole tools 200, some of the downhole tools 200 are tubular structures with closed bottoms. Therefore, pressure needs to be applied to the inside of the downhole tools 200 during testing. And compared with the original pressurization method, the internal and external pressurization mode is closer to the actual working state, and the test results are more accurate.
[0053] Such as Figure 5 and Figure 6 As shown, a protection pipe 170 is also arranged in the cavity between the central rod 110 and the wellbore 130. The upper part of the protection pipe 170 has a protruding end 171. The protruding end 171 is clamped with the table 133 at the upper part of the wellbore 130. The outer wall of the protection pipe 170 has a convex platform 172 extending outward. The convex platform 172 is slidably connected with the inner wall of the wellbore 130.
[0054] Specifically, according to the external dimensions of the downhole tool 200 to be tested, the protection pipe 170 has a variety of size specifications to adapt to the corresponding size of the downhole tool 200. In the connected state, the protruding end 171 at the upper part of the protection pipe 170 is clamped on the table 133 at the upper part of the wellbore 130. The protection pipe 170 is firmly connected to the wellbore 130 by the cooperation of the convex surface at the lower part of the head 140 and the concave surface at the upper part of the protection pipe 170. And multiple groups of sealing rings are also arranged at the position where the protruding end 171 contacts the wellbore 130.
[0055] In addition, grooves are arranged at the upper parts of the wellbore 130 and the protection pipe 170, and a protruding block corresponding to the groove is arranged at the lower part of the head 140. In the installed state, the head 140 can fix the protection pipe 170. For example, when testing a torque anchor, the slips of the torque anchor (referring to a downhole tool 200) will bite into the inner wall of the protection pipe 170. Rotating the central rod 110 can test the anchoring torque of the torque anchor. At this time, the protection pipe needs to be fixed and cannot rotate.
[0056] This device can be used in a vertical position or a horizontal position. When used in a horizontal position, the boss 172 is slidably connected to the inner wall of the wellbore 130, which can center the device to be tested and keep the whole device stable, avoiding the lower part of the protection tube 170 from shaking during pressurization and causing damage to the device due to bumping. Preferably, the material hardness of the protection tube 170 is less than that of the wellbore 130. The protection tube 170 can be made of high-temperature and high-pressure resistant steel. The protection tube 170 is a load-bearing component and needs to bear pressure, torque, the anchoring force of the tool anchor claws, etc. during use.
[0057] As Figure 5 shown, the head 140 is provided with a coolant inlet 142 and a coolant outlet 143; there is a cavity at the connection between the head 140 and the wellbore 130; the coolant flows through the coolant inlet 142, the cavity and the coolant outlet 143 in sequence.
[0058] Specifically, a cavity is provided at the connection between the head 140 and the wellbore 130. Two symmetric through holes are arranged along the axial direction of the upper part of the head 140. The two through holes are communicated with the cavity. One opening is the coolant inlet 142, and the other opening is the coolant outlet 143. During high-temperature and high-pressure tests, the coolant is injected into the cavity from the coolant inlet 142 and then flows out through the coolant outlet 143 for circulation; by circulating the coolant in the cavity, the temperature at the connection between the head 140 and the wellbore 130 can be reduced, the influence of high temperature on the seal can be reduced, and thus the sealing effect can be improved.
[0059] As Figure 2 shown, the test device 100 further includes a temperature sensor 180; the temperature sensor 180 is inserted into the lower part of the sealing plug 150 and extends upward to the upper part of the sealing plug 150.
[0060] Specifically, the upper end of the temperature sensor 180 is close to the upper end face of the sealing plug 150. After heating up, the temperature inside the wellbore 130 is measured by detecting the temperature of the upper part of the sealing plug 150. After the temperature reaches a predetermined value, constant-temperature heating starts. The temperature sensor 180 and the electromagnetic heating sleeve 160 cooperate to achieve intermittent heating, maintain the temperature, and save energy.
[0061] The specific operation steps of the present invention are as follows:
[0062] Step 1, assemble the wellbore 130 and the sealing plug 150, and place the protection tube 170 into the wellbore 130;
[0063] Step 2, connect the downhole tool 200 to the center rod 110 through the adapter 120, and insert the center rod 110 into the head 140;
[0064] Step 3, assemble the head 140 and the wellbore 130 through the clamp 141;
[0065] Step 4: Connect the external liquid injection device to the first pressure port 131, the second pressure port 132, and the third pressure port 111 respectively for liquid injection. After the liquid injection is completed, start the electromagnetic heating sleeve 160;
[0066] Step 5: Measure the temperature through the temperature sensor 180. When the temperature reaches the predetermined value, maintain the temperature. Perform a performance test on the tool 200 by pressurizing, lifting, or rotating the central rod at the pressure port. After the test is completed, turn off the electromagnetic heating sleeve 160;
[0067] Step 6: Let it stand for a period of time, then measure the temperature through the temperature sensor 180. After reaching the safe value, remove the clamp 141, take out the downhole tool 200, and detect the state of the downhole tool 200.
[0068] The present invention can achieve the following beneficial effects:
[0069] The test wellbore provided by the present invention can detect downhole tools 200 with different sizes and specifications, solving the problem that existing test equipment has strong specificity and cannot use a set of test equipment to perform performance tests on multiple downhole tools 200; and a protection tube 170 is also provided inside the wellbore 130. Some downhole tools 200 are equipped with anchoring devices, slips, or anchor teeth. When pressurizing the inside of the downhole tool 200, the slips or anchor teeth will protrude from the outer surface of the tool and bite into the inner wall of the protection tube 170. After the packer is set, pressurize from the second pressure port 132 below to test the ability of the packer rubber barrel to withstand the lower liquid pressure. Since the rubber barrel completely seals the inside of the protection tube 170, the lower liquid pressure pushes the packer upward. At this time, the slips or anchor teeth play a key role in anchoring the packer on the inner wall of the protection tube and preventing the packer from moving upward. If a downhole tool with poor quality is tested, slipping may occur, causing the slips or anchor teeth that bite into the inner wall of the protection tube 170 to slip (generate displacement), thereby damaging the inner wall of the protection tube 170. By providing a replaceable protection tube 170, the service life of the equipment is improved.
[0070] Embodiment 2
[0071] This embodiment includes the replaceable inner tube type high-temperature and high-pressure test wellbore described in Embodiment 1, and thus has all the beneficial effects of the replaceable inner tube type high-temperature and high-pressure test wellbore in Embodiment 1, which will not be elaborated here.
[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the various embodiments of the present invention.
Claims
1. A replaceable inner-tube type high-temperature and high-pressure test wellbore, characterized in that: it includes a test device (100); the test device (100) includes a central rod (110), a transition joint (120), and a wellbore (130); the transition joint (120) is arranged inside the wellbore (130); the central rod (110) is arranged inside the wellbore (130) and extends out from the upper part of the wellbore (130); the upper part of the transition joint (120) is inserted into the central rod (110); the lower part of the transition joint (120) is inserted into a downhole tool (200); there is a cavity between the wellbore (130) and the downhole tool (200).
2. The replaceable inner-tube type high-temperature and high-pressure test wellbore according to claim 1, characterized in that: the test device (100) further includes a head (140) arranged at the upper part of the wellbore (130) and a sealing plug (150) arranged at the lower part of the wellbore (130); the central rod (110) is inserted into the head (140); the head (140) is inserted into the wellbore (130) through a clamp (141); the sealing plug (150) is inserted into the wellbore (130) through a threaded locking ring (151).
3. The replaceable inner-tube type high-temperature and high-pressure test wellbore according to claim 2, characterized in that: an electromagnetic heating sleeve (160) is arranged on the outer wall of the wellbore (130).
4. The replaceable inner-tube type high-temperature and high-pressure test wellbore according to claim 3, characterized in that: the test device (100) further includes a first pressure port (131), a second pressure port (132), and a third pressure port (111); the first pressure port (131) and the second pressure port (132) communicate with the cavity and are used to apply pressure to the outside of the downhole tool (200); the third pressure port (111) is arranged at the upper part of the central rod (110) and is used to apply pressure to the inside of the downhole tool (200).
5. The replaceable inner-tube type high-temperature and high-pressure test wellbore according to claim 4, characterized in that: the central rod (110) and the transition joint (120) are vertically through.
6. The replaceable inner-tube type high-temperature and high-pressure test wellbore according to claim 5, characterized in that: a protection tube (170) is further arranged in the cavity between the central rod (110) and the wellbore (130); the upper part of the protection tube (170) has a convex end (171); the convex end (171) is clamped with a table surface (133) at the upper part of the wellbore (130).
7. The replaceable inner-tube type high-temperature and high-pressure test wellbore according to claim 6, characterized in that: the outer wall of the protection tube (170) has a convex platform (172) extending outwards; the convex platform (172) is slidably connected with the inner wall of the wellbore (130).
8. The replaceable inner-tube type high-temperature and high-pressure test wellbore according to claim 7, characterized in that: the head (140) is provided with a coolant inlet (142) and a coolant outlet (143); There is a cavity at the connection between the head (140) and the wellbore (130); The coolant flows through the coolant inlet (142), the cavity, and the coolant outlet (143) in sequence.
9. The replaceable inner-tube type high-temperature and high-pressure test wellbore according to claim 8, characterized in that: The test device (100) further includes a temperature sensor (180); The temperature sensor (180) is inserted into the lower part of the sealing plug (150) and extends upward to the upper part of the sealing plug (150).
10. A test system, characterized in that, it includes the replaceable inner-tube type high-temperature and high-pressure test wellbore according to any one of claims 1-9.