Test adapter substitute and test wellhead

Abstract

The invention relates to the technical field of injection and production well testing, in particular to a testing adapter substitute and a testing wellhead. The test conversion connector comprises the main body, the first connecting piece and the second connecting piece, the first connecting piece is arranged on the lower portion of the main body in a surrounding mode, and the first connecting piece is clamped in the test wellhead, so that the test conversion connector is connected with the test wellhead in the mode that the first connecting piece is clamped in the test wellhead; screw thread connection is not needed; due to the fact that at least part of the outer wall of the first connecting piece is attached to the inner wall of the testing wellhead, the sealing performance between the testing adapter substitute and the testing wellhead is guaranteed. The main body is provided with the switching channel communicated with the test wellhead, the second connecting piece is arranged at the top of the main body and used for being connected with the sealing pipeline, and the sealing pipeline is communicated with the switching channel, so that the connecting channel through which the test instrument can penetrate is formed, and the test instrument extends into the well from the connecting channel; and the injection-production well can be tested.

Description

Technical Field

[0001] The present invention relates to the technical field of injection-production well testing, and particularly to a test adapter and a test wellhead. Background Art

[0002] The influencing factors of the single-well gas injection-production capacity include: the size and structure of the injection-production string, the formation pressure and the test wellhead pressure, the minimum liquid-carrying capacity, the erosion flow rate, the formation critical sand production pressure difference, etc. In order to understand the above factors, it is necessary to test the injection-production well. When testing the injection-production well, in order to connect the test wellhead and the external test equipment, a test adapter needs to be installed at the test wellhead. In the prior art, for the test wellhead of the injection-production well with a general size, the test wellhead and the test adapter can be connected by screw threads. However, for the test wellhead of the injection-production well with a larger size, if screw thread connection is adopted, the construction intensity is high, it is easy to get stuck, and the screw threads are easily damaged. Therefore, there is an urgent need for a test adapter suitable for large-size injection-production wells. Summary of the Invention

[0003] The present application provides a test adapter and a test wellhead, which to a certain extent solve the technical problem that in the related art, for the test wellhead of a large-size injection-production well, if screw thread connection is adopted, it is easy to get stuck and the screw threads are easily damaged.

[0004] In a first aspect, an embodiment of the present application provides a test adapter, including:

[0005] A main body having a conversion channel for communicating with the test wellhead;

[0006] A first connecting member surrounding the lower part of the main body, the first connecting member being clamped in the test wellhead, and at least part of the outer wall of the first connecting member being attached to the inner wall of the test wellhead;

[0007] A second connecting member disposed at the top of the main body, the second connecting member being used for connecting a sealing pipeline, and the sealing pipeline being communicated with the conversion channel.

[0008] In some embodiments, the first connecting portion includes a connecting portion and a limiting portion, both the connecting portion and the limiting portion surround the main body, the limiting portion is disposed above the connecting portion and extends out of the connecting portion; the outer wall of the connecting portion is attached to the inner wall of the test wellhead, and the part of the limiting portion extending out of the connecting portion abuts against the upper part of the test wellhead.

[0009] In some embodiments, the outer wall of the connecting portion is inclined towards the central axis of the conversion channel.

[0010] In some embodiments, the first connecting portion further includes a first sealing ring. An outer wall of the first connecting member is provided with a first installation groove. The first sealing ring is installed in the first installation groove and is in close contact with an inner wall of the test wellhead.

[0011] In some embodiments, the second connecting member includes a connecting sleeve. The connecting sleeve is disposed at a top of the main body. The connecting sleeve communicates with the conversion channel, and there is an installation portion between an inner wall of the connecting sleeve and an inner wall of the conversion channel. The installation portion is used for assembling the sealing pipeline.

[0012] In some embodiments, the second connecting member includes at least one second sealing ring. The inner wall of the connecting sleeve is provided with at least one second installation groove corresponding to the second sealing ring one by one. The second sealing ring is installed in the corresponding second installation groove and is in close contact with an outer wall of the sealing pipeline.

[0013] In some embodiments, the main body includes a connected connecting section and a transition section. The connecting section is disposed below the transition section. The first connecting member surrounds an outer wall of the connecting section. The first connecting member is disposed at a top of the transition section.

[0014] In some embodiments, an inner diameter of the conversion channel is 90 mm - 160 mm.

[0015] In a second aspect, an embodiment of the present application further provides a test wellhead, including the above-mentioned test conversion joint.

[0016] In some embodiments, the test wellhead further includes a pressing member. One end of the pressing member is connected to an outer wall of the test wellhead, and the other end presses the limiting portion.

[0017] Advantages of the present application are as follows:

[0018] A test conversion joint and a test wellhead provided by the present application include a main body, a first connecting member, and a second connecting member. Since the first connecting member surrounds a lower portion of the main body and the first connecting member is clamped in the test wellhead, that is, the test conversion joint provided by the present application is connected to the test wellhead by clamping the first connecting member in the test wellhead, thereby eliminating the need for screw connection and reducing the construction intensity. Since an outer wall of at least a part of the first connecting member fits with an inner wall of the test wellhead, the sealing performance between the test conversion joint and the test wellhead is ensured. Since the main body has a conversion channel for communicating with the test wellhead, the second connecting member is disposed at a top of the main body, the second connecting member is used for connecting the sealing pipeline, and the sealing pipeline communicates with the conversion channel, thereby forming a connection channel through which a test instrument can pass. The test instrument extends into the well through this connection channel, and thus the injection-production well can be tested. Description of the Drawings

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention.

[0020] Figure 1 It is a schematic structural diagram of the test adapter provided by the embodiment of the present application.

[0021] Figure 2 For Figure 1 It is a top view of the middle baffle.

[0022] Explanation of reference numerals:

[0023] 1 - Test adapter, 100 - Main body, 110 - Conversion channel, 120 - Connection section, 130 - Transition section, 200 - First connector, 210 - Connection part, 220 - Limiting part, 230 - First installation groove, 240 - Third installation groove, 300 - Second connector, 310 - Connection sleeve, 320 - Second installation groove, 400 - Baffle, 410 - Fork, 420 - Slot, 430 - Through hole, 2 - Test wellhead, 3 - Compression part, 31 - Connecting rod, 32 - Compression rod. Specific embodiments

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0025] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If this specific posture changes, the directional indications will also change accordingly.

[0026] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In addition, in the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. Additionally, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or is unachievable, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0028] Some oil layers as a whole have the characteristics of layered composite massive oil and gas reservoirs. Classified by trap origin, they are all "fault-blocked ridge-shaped fault-nose structure oil and gas reservoirs". Classified by the spatial distribution of oil, gas and water, they belong to "gas-cap edge-water oil-ring oil and gas reservoirs", and there is a unified oil, gas and water interface and pressure system within the fault block. Specifically, in terms of the oil, gas and water distribution with a single layer as the unit, various forms can be seen, such as gas-cap edge (bottom) water oil layers, edge (bottom) oil layers, layered pure oil and gas layers, sand body pinch-out blocked oil and gas layers, physical property (mainly tight sand layers) blocked oil and gas layers, etc.

[0029] Gas storage injection-production wells generally have the characteristics of large injection and production volumes. It is necessary to complete the injection-gas-production conversion of injection-production wells within an extremely short time and achieve the purpose of peak shaving and ensuring supply. The influencing factors of the single-well injection and production gas capacity include: the size and structure of the injection-production string, formation pressure and test wellhead pressure, minimum liquid-carrying capacity, erosion flow rate, formation critical sand production pressure difference, etc. For the test wellhead of general-sized injection-production wells, a string with a diameter of 139 mm is used. According to the test of general-sized injection-production wells, it can be obtained that in the initial stage of gas injection when the formation pressure is relatively low, the production pressure difference is controlled within 2.5 MPa, and the gas injection capacity is controlled at about 100 - 160×104 m3; in the middle stage of gas injection when the formation pressure is at a certain level, the production pressure difference is controlled within 2.5 MPa, and the gas injection capacity is 120 - 200×104 m3; in the final stage of gas injection when the formation pressure is at a certain level, the production pressure difference is controlled within 1.0 MPa, and the gas injection capacity is 60 - 160×104 m3.

[0030] After scientific research and deployment, it can be known that for large-sized horizontal wells, a string with a diameter of 177.8 mm is used for injection and production. The daily gas production capacity of a single well can be as high as 2 million cubic meters. Under the same formation conditions, compared with horizontal wells with a string diameter of 139 mm, the daily peak shaving capacity of a single well can be increased by 1.5 to 1.8 times, and it can play a very important role in peak shaving and ensuring supply in the construction of gas storage. To master the formation pressure, flowing pressure, injection and production capacity, etc. of large-sized wells, it is necessary to test large-sized wells.

[0031] In the prior art, for the test wellhead of injection-production wells with general sizes, the test wellhead and the test adapter can be connected by screw threads. However, for the test wellhead of injection-production wells with larger sizes, if screw-thread connection is adopted, it is easy to get stuck and the screw threads of the production tree test wellhead are likely to be damaged. With the prominent advantages of large-size wells, the proportion of large-size wells in gas storage facilities will gradually increase, and the testing requirements will also increase significantly. Since large-size wells are emerging things, there is no test adapter applicable to large-size injection-production wells in the market, resulting in the inability to test large-size wells, which is extremely disadvantageous for understanding the production conditions of large-size wells. Therefore, there is an urgent need for a test adapter applicable to large-size injection-production wells.

[0032] To solve the problems in the prior art to a certain extent and better play the role of peak shaving and ensuring gas supply in gas storage facilities, the embodiment of the present application provides a test adapter. By means of clamping, the test adapter is connected to the test wellhead, thus eliminating the need for screw-thread connection and avoiding the situations of screw-thread jamming and damage, and ensuring the efficiency of the testing operation.

[0033] The following describes the embodiment of the present application with reference to the drawings:

[0034] Combined Figure 1 and Figure 2 The embodiment of the present application provides a test adapter 1 installed on a test wellhead 2, which includes a main body 100, a first connecting member 200 and a second connecting member 300. The main body 100 has a conversion channel 110 for communicating with the test wellhead. The first connecting member 200 is disposed around the lower part of the main body 100, and the second connecting member 300 is disposed on the top of the main body 100. The first connecting member 200 is used to connect with the test wellhead, and the second connecting member 300 is used to connect a sealing pipeline. The conversion channel 110 is communicated with both the sealing pipeline and the test wellhead.

[0035] The first connecting member 200 is clamped in the test wellhead, that is, the test adapter 1 provided by the present application is clamped in the test wellhead through the first connecting member 200 to realize connection with the test wellhead, thus eliminating the need for screw-thread connection and protecting the test wellhead from being damaged. At least part of the outer wall of the first connecting member 200 fits with the inner wall of the test wellhead, so as to achieve a certain sealing effect and improve the air leakage situation during the testing process.

[0036] Specifically, the lower end of the conversion channel 110 is used to communicate with the test wellhead, and the upper end is used to communicate with the sealing pipeline. A connection channel is formed between the sealing pipeline and the conversion channel 110, so that the test instrument connected to the cable can extend into the well through this connection channel to perform testing operations on the injection-production well. The sealing pipeline can seal and protect the test instrument.

[0037] In some embodiments, in order to enable the main body 100 to be perpendicular to the test wellhead and stably installed on the test wellhead, the first connection part 210 includes a connection part 210 and a limiting part 220. Both the connection part 210 and the limiting part 220 surround the main body 100. The limiting part 220 is arranged above the connection part 210 and extends out of the connection part 210. The outer wall of the connection part 210 fits against the inner wall of the test wellhead 2, and a part of the limiting part 220 that extends out of the connection part 210 abuts against the upper part of the test wellhead 2. That is, under the limitation of the limiting part 220, the main body 100 can be stably installed on the test wellhead, and since the limiting part 220 abuts against the upper part of the test wellhead, it can be ensured that the main body 100 is perpendicular to the test wellhead.

[0038] In some embodiments, since the inner wall of the test wellhead is slightly inclined, in order to ensure that at least a part of the outer wall of the first connecting piece 200 can be arranged in a fitting manner with the inner wall of the test wellhead, the outer wall of the connection part 210 is inclined towards the central axis of the conversion channel 110. Specifically, the inclination angle of the outer wall of the connection part 210 is 15° - 30°.

[0039] In some embodiments, in order to further improve the sealing effect between the outer wall of the first connecting piece 200 and the inner wall of the test wellhead, and the sealing performance between the test conversion joint 1 and the test wellhead, the first connection part 210 further includes a first sealing ring (not shown). A first installation groove 230 is formed on the outer wall of the first connecting piece 200, and the first sealing ring is installed in the first installation groove 230 and is in close contact with the inner wall of the test wellhead, thereby realizing the sealing between the test conversion joint 1 and the test wellhead. The sealing performance of the first sealing ring is better than the thread sealing in the prior art, and it is more safe and environmentally friendly.

[0040] In some embodiments, the second connecting piece 300 includes a connecting sleeve 310. The connecting sleeve 310 is arranged at the top of the main body 100. The connecting sleeve 310 is communicated with the conversion channel 110, and there is an installation part between the inner wall of the connecting sleeve 310 and the inner wall of the conversion channel 110 for assembling a sealing pipeline. When the sealing pipeline is assembled to the installation part, the outer wall of the sealing pipeline fits against the inner wall of the connecting sleeve 310, thereby realizing the communication between the sealing pipeline and the conversion channel 110. The connecting sleeve 310 and the conversion channel 110 can be coaxially arranged.

[0041] In some embodiments, in order to ensure the sealing performance between the sealing pipeline and the connecting sleeve 310, the second connecting piece 300 further includes at least one second sealing ring (not shown). At least one second installation groove 320 corresponding to the second sealing ring is arranged on the inner wall of the connecting sleeve 310. The second sealing ring is installed in the corresponding second installation groove 320 and is in close contact with the outer wall of the sealing pipeline, thereby realizing the sealing between the sealing pipeline and the connecting sleeve 310.

[0042] One, two or more second sealing rings can be provided, which can be set according to the actual situation, and there is no limit to this. When the number of second sealing rings is greater than one, the adjacent second sealing rings are arranged at intervals.

[0043] In some embodiments, during the process of the testing instrument being lifted upward by the cable after the test is completed, due to the relatively high air pressure in the test wellhead 2, it is easy to cause the cable to break due to the upward impact, and the testing instrument falls into the well. To improve this situation, a third installation groove 240 is formed in the inner wall of the first connector 200. The adapter also includes a baffle 400 and a retaining fork 410. The baffle 400 is arranged in the third installation groove 240. The baffle 400 is provided with a through hole 430 for the testing instrument to pass through, and a retaining groove 420 is provided on the upper surface of the baffle 400. The retaining groove 420 communicates with the through hole 430. One end of the retaining fork 410 is rotatably arranged on the baffle 400 so that the other end of the baffle 400 abuts against or separates from the retaining groove 420.

[0044] Under natural conditions, the other end of the retaining fork 410 abuts against the retaining groove 420 under the action of gravity, that is, the retaining fork 410 is in a horizontal state, thereby blocking the through hole 430, and the testing instrument cannot be lowered into the well through the through hole 430. Therefore, when the testing instrument needs to be lowered into the well, the retaining fork 410 is manually rotated to make the retaining fork 410 vertically arranged, and the through hole 430 is opened, and the testing instrument can be lowered into the well through the through hole 430. After the testing instrument passes through, the retaining fork 410 naturally returns to the horizontal state; when the testing instrument is lifted upward from the well, the retaining fork 410 is automatically knocked open to pass through the through hole 430 of the baffle 400. After the testing instrument passes through, the retaining fork 410 returns to the horizontal state again. Since the retaining fork 410 blocks the through hole 430, the testing instrument cannot be lowered into the well through the through hole 430, thereby avoiding the accidental falling of the testing instrument during the rising process.

[0045] It should be noted that the retaining fork 410 does not completely cover the through hole 430. When the retaining fork 410 is in a horizontal state, there are gaps inside the retaining fork 410 and on both sides of the retaining fork 410. Since the cable is relatively thin, the cable can pass through the through hole 430 whether the retaining fork 410 is in a horizontal or vertical state.

[0046] In some embodiments, in order to keep a gap between the sealing pipe and the test wellhead, the main body 100 includes a connected connecting section 120 and a transition section 130. The connecting section 120 is arranged below the transition section 130. The first connector 200 surrounds the outer wall of the connecting section 120, and the first connector 200 is arranged at the top of the transition section 130. That is, the transition section 130 separates the sealing pipe and the test wellhead to avoid mutual interference.

[0047] In some embodiments, the inner diameter of the conversion channel 110 is mm - mm to adapt to testing instruments of different sizes and improve the versatility of the test adapter 1.

[0048] A test adapter 1 provided by the present application includes a main body 100, a first connecting member 200, and a second connecting member 300. Since the first connecting member 200 surrounds the lower part of the main body 100 and the first connecting member 200 is clamped in the test wellhead, that is, the test adapter 1 provided by the present application is connected to the test wellhead by clamping the first connecting member 200 in the test wellhead, thus eliminating the need for threaded connection and reducing the construction intensity. Since at least part of the outer wall of the first connecting member 200 fits the inner wall of the test wellhead, the sealing performance between the test adapter 1 and the test wellhead is ensured. Since the main body 100 has a conversion channel 110 for communicating with the test wellhead, the second connecting member 300 is arranged at the top of the main body 100. The second connecting member 300 is used to connect a sealing pipeline, and the sealing pipeline communicates with the conversion channel 110, thereby forming a connecting channel through which a test instrument can pass. The test instrument extends into the well through this connecting channel, and then the injection-production well can be tested.

[0049] During the test, by using the test adapter 1 provided by the present application, the test instrument can be connected to the test wellhead of the large-size well gas production tree during the test, and the test wellhead is sealed under the action of the first sealing ring, ensuring sealing and no air leakage during the test, creating conditions for the test of the large-size well, normally testing the large-size well, understanding the production situation of the large-size well, injecting gas reasonably and producing gas scientifically, and giving full play to the peak shaving and supply guarantee function of the large-size well.

[0050] Based on the same inventive concept, an embodiment of the present application also provides a test wellhead 2, including the above test adapter 1. The beneficial effects of the test wellhead 2 provided by the embodiment of the present application are the same as those of the above test adapter 1 and will not be elaborated here.

[0051] In some embodiments, in order to enhance the installation stability of the test adapter 1, the test wellhead 2 further includes a pressing member 3. One end of the pressing member 3 is connected to the outer wall of the test wellhead 2, and the other end presses the limiting portion 220, so that the test adapter 1 is stably installed in the test wellhead 2.

[0052] In some embodiments, the pressing member 3 includes a connecting rod 31 and a pressing rod 32 arranged vertically. The connecting rod 31 is connected to the outer wall of the test wellhead 2, and the pressing rod 32 presses on the limiting portion 220.

[0053] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concept. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0054] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A test adapter, which is installed at a test wellhead, Characterized in that, Comprising: A main body having a conversion channel for communicating with the test wellhead; A first connecting member surrounding the lower part of the main body, the first connecting member being clamped in the test wellhead, and at least part of the outer wall of the first connecting member being in contact with the inner wall of the test wellhead; A second connecting member provided at the top of the main body, the second connecting member being used to connect a sealing pipe, and the sealing pipe communicating with the conversion channel.

2. The test adapter according to claim 1, Characterized in that, The first connecting portion includes a connecting portion and a limiting portion, both the connecting portion and the limiting portion surround the main body, the limiting portion is provided above the connecting portion and extends out of the connecting portion; the outer wall of the connecting portion is in contact with the inner wall of the test wellhead, and the part of the limiting portion extending out of the connecting portion abuts against the upper part of the test wellhead.

3. The test adapter according to claim 1, Characterized in that, The first connecting portion further includes a first sealing ring, the outer wall of the first connecting member is provided with a first installation groove, the first sealing ring is installed in the first installation groove and is in close contact with the inner wall of the test wellhead.

4. The test adapter according to any one of claims 1-3, Characterized in that, The second connecting member includes a connecting sleeve, the connecting sleeve is provided at the top of the main body, the connecting sleeve communicates with the conversion channel, and there is an installation portion between the inner wall of the connecting sleeve and the inner wall of the conversion channel for assembling the sealing pipe.

5. The test adapter according to claim 4, Characterized in that, The second connecting member includes at least one second sealing ring, the inner wall of the connecting sleeve is provided with at least one second installation groove corresponding to the second sealing ring one by one, the second sealing ring is installed in the corresponding second installation groove and is in close contact with the outer wall of the sealing pipe.

6. The test adapter according to claim 1, Characterized in that, A third installation groove is formed in the inner wall of the first connecting member, the adapter further includes a baffle and a retaining fork, the baffle is arranged in the third installation groove, the baffle has a through hole for a test instrument to pass through, and a retaining groove is formed on the upper surface of the baffle, and one end of the retaining fork is rotatably arranged on the baffle so that the other end of the baffle abuts against or separates from the retaining groove.

7. The test adapter according to claim 1, Characterized in that, The main body includes a connected connecting section and a transition section, the connecting section is arranged below the transition section, the first connecting member surrounds the outer wall of the connecting section, the first connecting member is arranged at the top of the transition section, and the third installation groove is formed in the transition section.

8. The test adapter according to claim 1, Characterized in that, The inner diameter of the conversion channel is 90mm - 160mm.

9. A test wellhead, Characterized in that, Comprising the test adapter according to any one of claims 2-8.

10. The test wellhead according to claim 1, Characterized in that, The test wellhead further includes a pressing member, one end of the pressing member is connected to the outer wall of the test wellhead, and the other end presses the limiting portion.

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