Derrick for testing oil and method of installing same

Abstract

The present application relates to a kind of derrick for oil testing and its installation method, it is related to oil and gas well testing technical field, for solving the inconvenient transportation problem of the derrick for oil testing existing.For solving the inconvenient transportation problem of the derrick for oil testing existing.Derrick includes derrick base, with wellhead and the Christmas tree that is detachably connected on wellhead;And first oil cylinder frame, detachably set on derrick base;And second oil cylinder frame, detachably set on first oil cylinder frame;Wherein, derrick base, first oil cylinder frame and second oil cylinder frame can be transported separately, when it is transported to site, sequentially assembled from bottom to top.The derrick is set into split structure in the present application, i.e.derrick is assembled from derrick base, first oil cylinder frame and second oil cylinder frame three parts on site.Derrick can be split into three sections for transportation, thereby improving the convenience of derrick transportation.

Description

Technical Field

[0001] This invention relates to the field of oil and gas well testing equipment technology, and in particular to a derrick for oil testing and its installation method. Background Technology

[0002] Oil testing is a means of testing the stable production of an oil reservoir and obtaining important data. As one of the key pieces of equipment for oil testing, the derrick used for oil testing is affected not only by factors such as the load of the oil testing operation, environmental wind load, and operation cycle, but also by factors such as the complex terrain conditions of the oil testing site, transportation and installation efficiency, safety, and convenience.

[0003] In related technologies, the derricks used for oil testing are fixed-shape mast-type derricks with fixed arms, which are huge in size and inconvenient to install and move, especially in mountainous and rugged terrain. This increases the time required to transport the derrick and affects on-site oil testing operations.

[0004] In other words, the derricks used for oil testing in the relevant technologies have the problem of inconvenient transportation. Summary of the Invention

[0005] This invention provides a derrick for oil testing and its installation method, which solves the problem of inconvenient transportation of derricks used for oil testing.

[0006] The present invention provides a derrick for oil testing, comprising a derrick base detachably connected to a wellhead and a wellhead tree installed on the wellhead; a first cylinder frame detachably mounted on the derrick base; and a second cylinder frame detachably mounted on the first cylinder frame; wherein the derrick base, the first cylinder frame and the second cylinder frame can be transported separately, and after being transported to the site, they are assembled sequentially from bottom to top.

[0007] In one embodiment, the derrick base includes: a support assembly detachably connected to a first cylinder frame; a support leg assembly pivotally connected to the support assembly for supporting the support assembly; and a connecting assembly disposed on the support leg assembly for detachable connection to the wellhead and the wellhead.

[0008] In one embodiment, the support assembly includes: a load-bearing plate pivotally connected to the support assembly; and a connecting plate disposed on the load-bearing plate, the connecting plate being detachably connected to the first cylinder frame.

[0009] In one embodiment, the load-bearing plate includes: an outer annular plate; and

[0010] A first connecting seat is located at the bottom of the outer annular plate and is pivotally connected to the support leg assembly; and an inner support plate is located inside the outer annular plate.

[0011] In one embodiment, the inner support plate is provided with weight-reducing holes to reduce the weight of the load-bearing plate.

[0012] In one embodiment, the support leg assembly includes: a plurality of legs spaced apart at the bottom end of the support base assembly and pivotally connected to the support base assembly, the plurality of legs simultaneously supporting the support base assembly; a plurality of second connecting seats, each corresponding to one of the plurality of legs; and a plurality of leg rods, one end of which is pivotally connected to the support base assembly, and the other end of which is pivotally connected to each of the plurality of second connecting seats; wherein a locking member is provided between a single leg rod and its corresponding second connecting seat, or a locking member is provided at the connection point between a single leg rod and its corresponding second connecting seat, the locking member being used to lock the rotation angle β between the single leg rod and its corresponding second connecting seat.

[0013] In one embodiment, when a locking element is provided at the connection between a single outrigger rod and its corresponding second connecting seat, the outrigger rod has a first connecting through hole, and the second connecting seat has a second connecting through hole. The first connecting through hole and the second connecting through hole coincide. The locking element includes a locking bolt and a locking nut. The locking bolt passes through the first connecting through hole and the second connecting through hole in sequence and is threadedly connected to the locking nut. Tightening the locking nut can lock the rotation angle β.

[0014] In one embodiment, the support leg assembly includes: three legs spaced apart at the bottom end of the support base assembly and pivotally connected to the support base assembly, with the multiple legs simultaneously supporting the support base assembly; three second connecting seats, each corresponding to one of the multiple legs; and three leg rods, one end of which is pivotally connected to the support base assembly, and the other end of which is pivotally connected to each of the multiple second connecting seats; wherein a locking member is provided between a single leg rod and its corresponding second connecting seat, or a locking member is provided at the connection point between a single leg rod and its corresponding second connecting seat, the locking member being used to lock the rotation angle β between the single leg rod and its corresponding second connecting seat.

[0015] In one embodiment, the support leg assembly further includes multiple support leg adjustment modules, which are respectively disposed at the bottom of multiple support legs, and the support leg adjustment modules can adjust the height of the corresponding support legs.

[0016] In one embodiment, the outrigger adjustment module includes: a screw, one end of which passes through and is threadedly connected to the bottom end of the outrigger; and a rotating disk, which is fixedly connected to the other end of the screw and is located below the outrigger; wherein rotating the rotating disk can adjust the height of the corresponding outrigger.

[0017] In one embodiment, the connecting assembly includes a first connecting structure for detachable connection with the wellhead. The first connecting structure includes: a plurality of third connecting seats, each corresponding to a plurality of outriggers; and a plurality of first tension ropes, one end of which is pivotally connected to the plurality of third connecting seats and the other end of which is detachably connected to the wellhead.

[0018] In one embodiment, the connecting assembly includes a second connecting structure for detachable connection to the wellhead. The second connecting structure includes multiple second tension ropes, which are respectively disposed between two adjacent outriggers among a plurality of outriggers.

[0019] The present invention also provides a method for installing a derrick for oil testing, comprising the following steps:

[0020] Step 1: Initially fix the derrick base;

[0021] Step two: Fixing the derrick base to the wellhead;

[0022] Step 3: Assembly of the first hydraulic cylinder frame and the derrick base;

[0023] Step four: Assembly of the second cylinder bracket and the first cylinder bracket.

[0024] Compared with existing technologies, the advantages of this invention lie in its modular design of the derrick, which is assembled on-site from three parts: the derrick base, the first hydraulic cylinder frame, and the second hydraulic cylinder frame. This allows the derrick to be disassembled into three sections for transportation, improving the convenience of derrick transportation and avoiding the transportation inconvenience caused by mast-type derricks in related technologies. Furthermore, the derrick in this application is hoisted in three sections, installed sequentially from bottom to top, resulting in a lighter lifting weight. This avoids the hoisting inconvenience caused by mast-type derricks in related technologies, thereby improving the efficiency of on-site derrick assembly and disassembly while reducing the risk of on-site hoisting, meeting the requirements of safe on-site operations. In addition, because the derrick is designed as a three-section modular structure, the hoisting equipment can be used for segmented hoisting, allowing for the selection of lightweight hoisting equipment, thus saving on-site installation costs. Attached Figure Description

[0025] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0026] Figure 1 This is a schematic diagram of the structural composition of the derrick in an embodiment of the present invention;

[0027] Figure 2 yes Figure 1 A three-dimensional structural diagram of the base of the central derrick;

[0028] Figure 3yes Figure 2 A partial enlarged view of point A at the top of the derrick base;

[0029] Figure 4 yes Figure 2 A partial enlarged view of point B at the bottom end of the derrick base;

[0030] Figure 5 yes Figure 1 A schematic diagram of the structural components of the first hydraulic cylinder bracket;

[0031] Figure 6 yes Figure 1 A bottom view of the first hydraulic cylinder bracket;

[0032] Figure 7 yes Figure 1 A schematic diagram of the structure of the second hydraulic cylinder bracket.

[0033] Figure label:

[0034] 10. Derrick base; 11. Support seat assembly; 111. Load-bearing plate; 1111. Outer annular plate; 1112. First connecting seat; 1113. Inner support plate; 1114. Weight reduction hole; 112. Connecting plate; 12. Support leg assembly; 121. Outrigger; 122. Second connecting seat; 123. Outrigger tie rod; 124. Locking element; 125. Outrigger adjustment module; 1251. Screw; 1252. Rotary disc; 13. Connection components; 131, First connection structure; 1311, Third connection seat; 1312, First tension rope; 132, Second connection structure; 1321, Second tension rope; 20, First cylinder frame; 21, Cylinder frame connecting flange seat; 22, Lower cylinder frame square steel support structure; 23, Lower cylinder frame support leg; 30, Second cylinder frame; 31, Upper cylinder frame square steel support structure; 32, Upper cylinder frame support leg; 100, Derrick. Detailed Implementation

[0035] The invention will now be further described with reference to the accompanying drawings.

[0036] like Figure 1 As shown, the present invention provides a derrick 100 for oil testing, comprising a derrick base 10, a first cylinder bracket 20, and a second cylinder bracket 30. The derrick base 10 is detachably connected to the wellhead and a Christmas tree installed on the wellhead. The first cylinder bracket 20 is detachably mounted on the derrick base 10, and the second cylinder bracket 30 is detachably mounted on the first cylinder bracket 20. The derrick base 10, the first cylinder bracket 20, and the second cylinder bracket 30 can be transported separately, and after being transported to the site, they are assembled sequentially from bottom to top.

[0037] In the above configuration, the derrick 100 is designed as a split structure, meaning it is assembled on-site from three parts: the derrick base 10, the first hydraulic cylinder frame 20, and the second hydraulic cylinder frame 30. This allows the derrick 100 to be disassembled into three sections for transport, improving the convenience of derrick transportation and avoiding the transportation inconvenience caused by mast-type derricks in related technologies. Furthermore, the derrick 100 in this application is hoisted in three sections, installed sequentially from bottom to top, resulting in a lighter lifting weight. This avoids the hoisting inconvenience caused by mast-type derricks in related technologies, thereby improving the efficiency of on-site derrick assembly and disassembly while reducing the risk of on-site hoisting, meeting the requirements for safe on-site operations. Additionally, because the derrick 100 is designed as a three-section split structure, the hoisting equipment can be used for segmented hoisting, allowing the selection of lightweight hoisting equipment, thus saving on-site installation costs.

[0038] Specifically, such as Figure 2 and Figure 3 As shown, in one embodiment, the derrick base 10 includes a support seat assembly 11, a support leg assembly 12, and a connecting assembly 13. The support seat assembly 11 is detachably connected to the first cylinder frame 20, the support leg assembly 12 is pivotally connected to the support seat assembly 11 and serves to support the support seat assembly 11, and the connecting assembly 13 is disposed on the support leg assembly 12 and serves to be detachably connected to the wellhead and the wellhead.

[0039] In the above configuration, the support leg assembly 12 is pivotally connected to the support base assembly 11. This allows the support leg assembly 12 to be folded out from the support base assembly 11 to support the support base assembly 11 when the derrick 100 is in use. When the derrick 100 is not in use, the support leg assembly 12 can be folded into the support base assembly 11. This facilitates the storage and transportation of the derrick base 10, thereby improving the convenience of transporting the derrick 100.

[0040] Specifically, such as Figure 2 and Figure 3 As shown, in one embodiment, the support base assembly 11 includes a load-bearing plate 111 and a connecting plate 112. The load-bearing plate 111 is pivotally connected to the support base assembly 11; the connecting plate 112 is disposed on the load-bearing plate 111 and is detachably connected to the first hydraulic cylinder frame 20.

[0041] In the above configuration, the load-bearing plate 111 supports the weight of the first cylinder bracket 20, the second cylinder bracket 30, and the cylinders mounted thereon. The connecting plate 112 is used to securely connect the first cylinder bracket 20 mounted thereon. This ensures that the derrick 100 can be installed correctly, thereby ensuring that the on-site oil testing operation can proceed normally.

[0042] Specifically, such as Figure 2 and Figure 3As shown, in one embodiment, the connecting plate 112 is welded to the load-bearing plate 111.

[0043] Specifically, such as Figure 2 and Figure 3 As shown, in one embodiment, the load-bearing plate 111 includes an outer annular plate 1111, a first connecting seat 1112, and an inner support plate 1113. The first connecting seat 1112 is disposed at the bottom of the outer annular plate 1111 and is pivotally connected to the support leg assembly 12. The inner support plate 1113 is disposed inside the outer annular plate 1111.

[0044] In the above configuration, the first connecting seat 1112 increases the connection strength between the outer annular plate 1111 and the support leg assembly 12, thereby meeting the strength requirements of the support seat assembly 11. The inner support plate 1113 strengthens the outer annular plate 1111, thus meeting the strength requirements of the support seat assembly 11.

[0045] Specifically, such as Figure 2 and Figure 3 As shown, in one embodiment, the inner support plate 1113 is provided with weight-reducing holes 1114 to reduce the weight of the load-bearing plate 111. This reduces the overall weight of the derrick base 10, thereby improving the ease of transportation of the derrick base 10.

[0046] Specifically, such as Figure 2 and Figure 3 As shown, in one embodiment, the outer annular plate 1111 has a triangular ring structure. The three corners of the outer annular plate 1111 are ground smooth. This prevents the corners from scratching personnel on site, thus meeting the requirements for safe transportation.

[0047] Specifically, such as Figure 2 and Figure 3 As shown, in one embodiment, the inner support plate 1113 is a triangular plate, and the three corners of the triangular plate are welded to the inner part of the outer annular plate 1111.

[0048] Specifically, such as Figure 2 and Figure 3 As shown, in one embodiment, the above-mentioned triangular plate is provided with a plurality of hollow holes as weight reduction holes 1114.

[0049] Specifically, such as Figure 2 and Figure 3As shown, in one embodiment, the support leg assembly 12 includes three legs 121 and three second connecting seats 122. The three legs 121 are spaced apart at the bottom end of the support base assembly 11 and pivotally connected to it, with the multiple legs 121 simultaneously supporting the support base assembly 11. The three second connecting seats 122 are correspondingly disposed on the multiple legs 121. One end of each of the three leg rods 123 is pivotally connected to the support base assembly 11, and the other end is pivotally connected to each of the multiple second connecting seats 122. A locking member 124 is provided at the connection point between a single leg rod 123 and its corresponding second connecting seat 122, the locking member 124 being used to lock the rotation angle β between the single leg rod 123 and its corresponding second connecting seat 122.

[0050] In the above configuration, the three outriggers 121 form a triangular support frame, which provides triangular support for the support base assembly 11. This improves the stability and reliability of the outrigger assembly 12, thereby enhancing the stability and reliability of the derrick 100. Outrigger tie rods 123 are provided to adjust the rotation angle β between a single outrigger tie rod 123 and its corresponding second connecting seat 122. This allows for initial adjustment of the support height of the derrick base 10, enabling the derrick 100 to be adjusted according to the length of the oil testing tool string.

[0051] In addition, the three outrigger rods 123 can be adjusted individually by their respective rotation angles β. This allows the derrick base 10 to be leveled according to different ground inclinations, thus meeting the leveling requirements of the derrick 100.

[0052] Specifically, such as Figure 1 As shown, in one embodiment, the rotation angle β ranges from 110° to 135°.

[0053] Of course, in alternative embodiments not shown in the accompanying drawings, a locking member 124 is provided between the individual outrigger rod 123 and its corresponding second connecting seat 122, the locking member 124 being used to lock the rotation angle β between the individual outrigger rod 123 and its corresponding second connecting seat 122.

[0054] In alternative embodiments not shown in the accompanying drawings, the support leg assembly 12 includes two legs 121, and correspondingly provides two second connecting seats 122, two leg pull rods 123, and two locking members 124. The two legs 121 are symmetrically arranged along the central axis of the support assembly 11.

[0055] In alternative embodiments not shown in the accompanying drawings, the support leg assembly 12 includes four or more legs 121, and correspondingly provides four or more second connecting seats 122, four or more leg pull rods 123, and four or more locking members 124. The four or more legs 121 are evenly distributed along the central axis of the support assembly 11.

[0056] Specifically, such as Figure 2 and Figure 3 As shown, in one embodiment, the outrigger rod 123 has a first connecting through hole, and the second connecting seat 122 has a second connecting through hole. The first connecting through hole and the second connecting through hole coincide. The locking member 124 includes a locking bolt and a locking nut. The locking bolt passes through the first connecting through hole and the second connecting through hole in sequence and is threadedly connected to the locking nut. Tightening the locking nut can lock the rotation angle β.

[0057] It should be noted that when the locking nut is tightened, the locking nut presses against the second connecting seat 122, and the rotation angle β is locked by the friction between the locking nut and the second connecting seat 122.

[0058] Specifically, such as Figure 2 and Figure 3 As shown, in one embodiment, the support leg assembly 12 further includes three support leg adjustment modules 125, which are respectively disposed at the bottom of the three support legs 121. The support leg adjustment modules 125 can adjust the height of the corresponding support leg 121.

[0059] In the above configuration, the outrigger adjustment module 125 is used to fine-tune the vertical height of the corresponding outrigger 121, which, in conjunction with the initial adjustment of the outrigger tie rod 123, ensures that the derrick base 10 can meet the accuracy requirements for leveling and height adjustment of the derrick 100.

[0060] Specifically, such as Figure 4 As shown, in one embodiment, the outrigger adjustment module 125 includes a screw 1251 and a rotating disk 1252. One end of the screw 1251 passes through and is threadedly connected to the bottom end of the outrigger 121. The rotating disk 1252 is fixedly connected to the other end of the screw 1251 and is located below the outrigger 121. Rotating the rotating disk 1252 adjusts the height of the corresponding outrigger 121.

[0061] Specifically, such as Figure 4 As shown, in one embodiment, a tooling hole is provided on the outer periphery of the rotary disk 1252 for connecting with a rotating tool. The rotary disk 1252 can be rotated in the forward or reverse direction by rotating the tool, thereby fine-tuning the vertical height of the support leg 121.

[0062] Specifically, such as Figure 1 and Figure 2 As shown, in one embodiment, the connecting assembly 13 includes a first connecting structure 131 for detachable connection to the wellhead. The first connecting structure 131 includes three third connecting seats 1311 and three first tension ropes 1312. The three third connecting seats 1311 are correspondingly disposed on the multiple outriggers 121. Their other ends are detachably connected to the wellhead.

[0063] Specifically, such as Figure 1 and Figure 2 As shown, in one embodiment, the connecting assembly 13 includes a second connecting structure 132 for detachable connection with the wellhead. The second connecting structure 132 includes three second tension ropes 1321, which are respectively disposed between two adjacent outriggers 121 of the three outriggers 121.

[0064] The present invention also provides a method for installing a derrick, the method being used to install the aforementioned derrick for oil testing, comprising the following steps:

[0065] Step 1: Initially fix the derrick base;

[0066] Step two: Fixing the derrick base to the wellhead;

[0067] Step 3: Assembly of the first hydraulic cylinder frame and the derrick base;

[0068] Step four: Assembly of the second cylinder bracket and the first cylinder bracket.

[0069] The following is combined Figures 1 to 7 Let me describe a more specific embodiment of this application:

[0070] The present invention provides a quick-moving and quick-installing derrick 100 for oil testing, which includes a derrick base 10, a lower section hydraulic cylinder frame (first hydraulic cylinder frame 20), an upper section hydraulic cylinder frame (second hydraulic cylinder frame 30), the upper section hydraulic cylinder frame and the lower section hydraulic cylinder frame are connected together by bolts, the derrick base 10 is provided with a base connecting flange seat (connecting plate 112), and the lower section hydraulic cylinder frame is provided with a hydraulic cylinder frame connecting flange seat 21. The connection between the lower section hydraulic cylinder frame and the derrick base 10 is completed through the base connecting flange seat and the hydraulic cylinder frame connecting flange seat 21.

[0071] Specifically, the derrick base 10 has an equilateral triangular structure, with all components distributed along its three sides in equilateral triangular patterns. The derrick base 10 also includes outriggers 121. The Christmas tree tension rope (first tension rope 1312) is connected to the outrigger 121 via a pin hole structure (pivotal connection), allowing for the fixation of the Christmas tree. One end of the outrigger tension rope (second tension rope 1321) is connected to the outrigger 121 via a pin hole, and the other end is fixed to the wellhead via a connecting bolt, connecting the triangular support to the wellhead. Adjusting the outrigger tension rope allows for the tensioning and fixing of the triangular support. This structural design speeds up the installation of the derrick 100, saving installation time. Furthermore, the outrigger 121 is connected to the outrigger adjustment module 125 via a mortise and tenon structure. The outrigger adjustment module 125 achieves lifting and lowering via a large-pitch thread and can be rotated and adjusted using tools such as steel bars with a diameter less than 20mm (rotary fixtures). The three outriggers 121 are connected to the outrigger rods 123 via a pin structure, allowing the outriggers 121 to rotate to a limited extent. The outrigger adjustment module 125 can also adjust the height of the retracted outriggers. This structure can be folded during the transportation of the derrick 100, greatly reducing the space occupied.

[0072] Specifically, the outrigger 121 is connected to the outer annular plate 1111 via the first connecting seat 1112, and the outrigger rod 123 is connected to the outrigger 121 via a pin hole structure (pivotal connection). The outrigger rod 123 is also connected to the first connecting seat 1112 via a pin hole structure. This support method can effectively support the entire derrick structure and ensure its stability.

[0073] Specifically, the lower cylinder bracket is an equilateral triangle structure. The square steel support structure 22 of the lower cylinder bracket protects the cylinder extension shaft, and the lower cylinder bracket legs 23 are used for fixed connection with the triangular bracket. The square steel support structure 22 and the lower cylinder bracket legs 23 are connected by welding. Both the square steel support structure 22 and the lower cylinder bracket legs 23 are made of 120×120×8 square steel (see...). Figure 5 and Figure 6 ).

[0074] Specifically, the upper cylinder frame has an equilateral triangular structure. The square steel support structure 31 of the upper cylinder frame protects the cylinder body. The upper cylinder frame legs 32 are used for connecting and fixing the cylinder. The square steel support structure 31 and the upper cylinder frame legs 32 are welded together. Both the square steel support structure 31 and the upper cylinder frame legs 32 are welded from 120×120×8 square steel. A cylinder connection flange connection hole is pre-drilled at the top of the upper cylinder frame. The cylinder is connected via the cylinder flange and bolts (see...). Figure 7 ).

[0075] In this invention, a pluggable square pin is used to open and retract the outriggers. The square pin is located on the top of the outrigger 121 and is connected to the first connecting seat 1112. The outrigger can be folded by removing the square pin. After the outrigger is unfolded, the directional pin is inserted to open the outrigger, which meets the volume requirements for road transportation. The height of the three outriggers is adjustable to meet the leveling requirements of the derrick. The derrick is erected by connecting the pins and the tension rope, which improves the efficiency of the transfer and installation of the derrick for oil testing.

[0076] It should be noted that the top of the support leg 121 is pivotally connected to the first connecting seat 1112, and the square pin here only serves to lock the rotational position of the top of the support leg 121 and the first connecting seat 1112.

[0077] Specifically, this application also provides a more specific method for installing a derrick, including the following steps:

[0078] Step 1: Open the outriggers in the derrick base, and adjust the opening angle of the outriggers using the outrigger rods and outrigger seats to initially fix the derrick base.

[0079] Step 2: Connect the derrick base and the wellhead using adjustable outrigger ropes to secure the derrick base and wellhead.

[0080] Step 3: Adjust the height of the derrick using the outrigger adjustment module. On the construction site, tools such as steel bars with a diameter of less than 20mm can be used to rotate and adjust the derrick to the appropriate height.

[0081] Step 4: Connect and fix the lower section of the hydraulic cylinder frame to the derrick base using M26 bolts via the base connecting flange seat and the cylinder frame connecting flange seat.

[0082] Step 5: Connect the upper cylinder bracket to the lower cylinder bracket using M26 bolts.

[0083] Although the invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A derrick for use in well testing, characterized in that include: The derrick base is detachably connected to the wellhead and the Christmas tree installed on the wellhead; as well as The first hydraulic cylinder bracket is detachably mounted on the derrick base; as well as The second cylinder bracket is detachably mounted on the first cylinder bracket; The derrick base, the first cylinder frame, and the second cylinder frame can be transported separately and assembled sequentially from bottom to top after being transported to the site. The derrick base includes: a support seat assembly detachably connected to the first cylinder frame; a support leg assembly pivotally connected to the support seat assembly for supporting the support seat assembly; and a connecting assembly disposed on the support leg assembly for detachably connecting to the wellhead and the wellhead. The support leg assembly includes: a plurality of legs spaced apart at the bottom end of the support base assembly and pivotally connected to the support base assembly, the plurality of legs simultaneously supporting the support base assembly; a plurality of second connecting seats corresponding to the plurality of legs; and a plurality of leg pull rods, one end of which is pivotally connected to the support base assembly, and the other end of which is pivotally connected to the plurality of second connecting seats corresponding to each other. A locking element is provided between a single outrigger rod and its corresponding second connecting seat, or a locking element is provided at the connection between a single outrigger rod and its corresponding second connecting seat. The locking element is used to lock the rotation angle β between the single outrigger rod and its corresponding second connecting seat. The connecting assembly includes a first connecting structure for detachable connection with the oil wellhead. The first connecting structure includes: a plurality of third connecting seats, each corresponding to one of the plurality of outriggers; and a plurality of first tension ropes, one end of which is pivotally connected to one of the plurality of third connecting seats, and the other end of which is detachably connected to the oil wellhead. The connecting assembly further includes a second connecting structure for detachable connection with the wellhead. The second connecting structure includes multiple second tension ropes, which are respectively disposed between two adjacent outriggers among the multiple outriggers.

2. The mast for testing oil wells according to claim 1, characterized in that, The support assembly includes: The load-bearing plate is pivotally connected to the support assembly; and A connecting plate is disposed on the load-bearing plate, and the connecting plate is detachably connected to the first hydraulic cylinder frame.

3. The mast for testing oil wells according to claim 2, characterized in that, The load-bearing plate includes: Outer annular plate; and A first connecting seat is disposed at the bottom of the outer annular plate, and the first connecting seat is pivotally connected to the support leg assembly; and An inner support plate is disposed within the outer annular plate.

4. The mast for testing a well of claim 3, wherein, The inner support plate is provided with weight-reducing holes to reduce the weight of the load-bearing plate.

5. The mast for testing oil wells of claim 1, wherein, When a locking element is provided at the connection between a single outrigger rod and its corresponding second connecting seat, the outrigger rod has a first connecting through hole, and the second connecting seat has a second connecting through hole. The first connecting through hole and the second connecting through hole coincide. The locking element includes a locking bolt and a locking nut. The locking bolt passes through the first connecting through hole and the second connecting through hole in sequence and is threadedly connected to the locking nut. Tightening the locking nut can lock the rotation angle β.

6. The mast for testing a well of claim 1, wherein, The support leg assembly includes: Three support legs are spaced apart at the bottom end of the support assembly and pivotally connected to the support assembly, the multiple support legs simultaneously supporting the support assembly; and Three second connecting seats are respectively arranged on the plurality of legs; and The three outrigger rods are pivotally connected at one end to the support base assembly, and at the other end to the three second connecting seats respectively. A locking element is provided between a single outrigger rod and its corresponding second connecting seat, or a locking element is provided at the connection between a single outrigger rod and its corresponding second connecting seat. The locking element is used to lock the rotation angle β between the single outrigger rod and its corresponding second connecting seat.

7. The mast for testing a well of claim 1, wherein, The support leg assembly also includes multiple support leg adjustment modules, which are respectively disposed at the bottom of the multiple support legs. The support leg adjustment modules can adjust the height of the corresponding support leg.

8. The mast for testing a well of claim 7, wherein, The outrigger adjustment module includes: A screw, one end of which passes through the bottom end of the support leg and is threadedly connected thereto; and A rotating disk is fixedly connected to the other end of the screw, and the rotating disk is located below the support leg; The height of the corresponding support leg can be adjusted by rotating the rotating disk.

9. A method of installing a derrick, characterized by, The installation method is used to install the derrick for oil testing as described in any one of claims 1 to 8, and includes the following steps: Step 1: Initially fix the derrick base; Step two: fixing the derrick base to the wellhead; Step 3: Assembly of the first hydraulic cylinder frame and the derrick base; Step four: Assembly of the second cylinder bracket with the first cylinder bracket.

Images