Cross arm nipple assembly of oil well drilling tool

Abstract

An oil well drilling tool cross arm short section assembly relates to the field of oil drilling tools and comprises a drilling tool cross arm short section and a cross arm rod, the drilling tool cross arm short section further comprises an upper connector, a cross arm body and a lower connector, the upper connector, the cross arm body and the lower connector are sequentially connected, a flow guide hole is formed in the cross arm body in the axial direction and axially penetrates through the two axial ends of the cross arm body, and the cross arm rod is connected with the flow guide hole. The cross arm body is provided with a cross arm hole in the radial direction, the cross arm hole horizontally penetrates through the cross arm body through the axis, the cross section shape of the cross arm body corresponds to the cross section shape of the cross arm hole, and after the cross arm body is inserted into the cross arm hole, the cross arm can bear a drilling tool cross arm short section in a balanced mode. The tendency of interference and conflict with other operation activities in a narrow wellbay operation space can be reduced, the operation intensity is reduced, the operation efficiency is improved, and the safety, the reliability and the stability of hanging and matching of a drilling tool and a drilling rod can be ensured in production by adopting an inner insertion matching connection mode with a drilling tool cross arm short section.

Description

Technical Field

[0001] The utility model relates to the field of petroleum drilling tools, in particular to a cross arm short section assembly of oil well drilling tools. Background Art

[0002] In offshore oilfield production, the oil well casing in the production well is very susceptible to corrosion by seawater and harmful substances due to the strong metal corrosion of seawater and marine geological environment. In production, it is necessary to replace these corroded oil well casings in time. Before removing and salvaging the replacement section of the oil well casing in the replacement operation, it is necessary to cut the section of the oil well casing downhole. The cutting operation is carried out by sending a cutter downhole while drilling. With the gradual improvement of the requirements for the efficiency of oil well casing cutting and the in-depth development of oil well casing cutting technology, the functional structure of downhole oil well casing cutting tools has been continuously improved, and the comprehensive performance has been fully improved. However, at the same time, the oil well casing cutting tools have also shown a heavy trend. Not only the structure volume has increased significantly, but also the overall weight has increased significantly. Therefore, the use of standard diameter drill pipes to connect and send these oil well casing cutting tools for downhole operations can no longer meet the requirements of safety production and technical regulations. For this reason, large diameter drill pipes are used in current production to replace standard diameter drill pipes to connect and send cutting tools for downhole operations. However, due to the large difference in specifications, the large-diameter drill pipe cannot be connected with the wellhead slip, so when connecting or splitting the pipe string, the wellhead chuck with a U-shaped notch can only be used to temporarily hang the drill pipe. This wellhead chuck is not only large in size and heavy in weight, but also has too high intensity of repeated movement in the limited well platform operation space, low operating efficiency, and may conflict with other production operations. In addition, the outer circumference of the drill pipe is used for the clamping connection, and there is also the risk of deformation of the U-shaped notch and mismatch of the drill pipe, which may cause the downhole drill pipe to be unbalanced and tilted or even fall off and fall into the well, causing production accidents. Therefore, it is necessary to research and develop a wellhead hanging tool that is reliable and easy to use and matches the large-diameter drill pipe to improve the efficiency of connecting and splitting the pipe string. Utility Model Content

[0003] The utility model aims to provide an oil well drilling tool cross arm short section assembly, which adopts a cross arm and an inner hole interpolation matching structure to suspend the drilling tool drill rod, thereby reducing the operation intensity, improving the operation efficiency, and ensuring the safety, reliability and stability of the drilling tool drill rod hanging matching.

[0004] A cross arm pup joint assembly for oil well drilling tools comprises: a drilling tool cross arm pup joint and a shoulder rod, wherein the drilling tool cross arm pup joint further comprises: an upper joint, a cross arm body and a lower joint; the upper joint, the cross arm body and the lower joint are connected in sequence, and connection structures are respectively arranged at the upper end of the upper joint and the lower end of the lower joint, so that the drilling tool cross arm pup joint can be connected and connected to the drilling tool drill rod, the cross arm body is axially provided with a guide hole, the guide hole axially passes through the two ends of the cross arm body, and radially provided with a cross arm hole, the cross arm hole passes through the cross arm body horizontally through the axis; the shoulder rod is a load-bearing rod body, and the cross-sectional shape of the rod body corresponds to the cross-sectional shape of the cross arm hole. After the shoulder rod is inserted into the cross arm hole, the shoulder rod can balance the load on the drilling tool cross arm pup joint.

[0005] The oil well drilling tool cross arm short section assembly is preferably equipped with a control handle at one end of the cross arm, and is also equipped with a fixed baffle. The minimum plate diameter of the fixed baffle is larger than the maximum hole diameter of the cross arm hole, which provides safety protection for operators and reduces production safety risks.

[0006] The oil well drilling tool cross arm short section assembly is preferably provided with a limit baffle at the other end of the shoulder bar opposite to the end where the fixed baffle is set, the minimum plate diameter of the limit baffle is larger than the maximum hole diameter of the cross arm hole, and is detachably connected and installed on the rod body of the shoulder bar. After removing the limit baffle, the control handle can be operated to insert the shoulder bar into the cross arm hole or withdraw it from the cross arm hole. After installing the limit baffle, the limit baffle can cooperate with the fixed baffle to limit the shoulder bar in two directions, so as to avoid or prevent the shoulder bar from falling off from one end of the cross arm hole in the working state, causing serious oil field production accidents.

[0007] In the oil well drilling tool cross arm short section assembly, the shoulder rod and the cross arm hole are preferably inserted into each other in a cross-sectional circular limiting manner, that is, when the shoulder rod is inserted into the cross arm hole, relative rotation cannot occur between the shoulder rod and the cross arm body, thereby ensuring the stability of the shoulder rod in bearing the drilling tool cross arm short section.

[0008] The beneficial effect of the utility model is to provide an oil well drilling tool cross arm short section assembly, which can connect the drill tool cross arm short sections alternately between the pipe strings of the drill tool drill pipe, and can use a compact, small and light-weight stretch rod to immediately cooperate with the drill tool cross arm short section connected to the corresponding section to hang the drill tool drill pipe when connecting or disassembling any pipe string, thereby reducing the tendency of interference and conflict with other production operations in the narrow well platform operating space, reducing the operation intensity and improving the operation efficiency. In particular, the stretch rod and the drill tool cross arm short section adopt an interpolation connection method, which can fully enable the stretch rod to carry the drill tool drill pipe in a balanced and stable manner, avoiding the production safety risk that the drill tool cross arm short section may accidentally fall off the stretch rod and fall into the well, and can fully guarantee the safety, reliability and stability of the drilling tool drill pipe hanging cooperation in production applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is the structural diagram of the drilling tool cross arm short section.

[0010] Figure 2 for Figure 1 Sectional view of the AA section.

[0011] Figure 3 This is the structure diagram of the tie rod.

[0012] Figure 4 for Figure 3 Cross-sectional view of the middle BB section.

[0013] Among them: 1 is the arm, 2 is the upper joint, 3 is the cross arm body, 4 is the lower joint, 5 is the fixed baffle, 6 is the limit baffle, 7 is the control handle, 8 is the guide hole, and 9 is the cross arm hole. DETAILED DESCRIPTION

[0014] Furthermore, the technical solution for which protection is sought in the present utility model is described in detail in conjunction with specific embodiments and their accompanying drawings.

[0015] A cross arm short section assembly of an oil well drilling tool, such as Figures 1 to 4As shown, it is composed of a shoulder rod 1, an upper joint 2, a cross arm body 3 and a lower joint 4; the shoulder rod 1 is a cylindrical straight rod body with column-notched planes on both sides corresponding to the radial direction, one end of the rod body is a control end, and the other end is an insertion end, a control handle 7 is connected and installed on the end head of the control end and a fixed baffle 5 is fixedly welded, the control handle 7 is a circular ring handle, the fixed baffle 5 is a circular plate body, a limit baffle 6 is equipped at the insertion end, the limit baffle 6 is also a circular plate body, and is installed on the shoulder rod 1 by bolt connection; the upper joint 2, the cross arm body 3 and the lower joint 4 are threadedly connected in sequence from top to bottom to form a cross arm short section of the drilling tool, a connecting internal thread is provided at the upper end of the upper joint 2, and a connecting internal thread is provided at the lower joint The lower end of the head 4 is provided with a connecting external thread, and the cross arm body 3 is provided with a cross arm hole 9, and the cross arm hole 9 passes through the cross arm body 3 horizontally through the axis, and the cross-sectional shape corresponds to the cross-sectional shape of the rod body of the shoulder rod 1, so that the shoulder rod 1 can be inserted into the cross arm hole 9 and limit the relative rotation between the shoulder rod 1 and the cross arm body 3. The maximum aperture of the cross arm hole 9 is smaller than the disk diameter of the fixed baffle 5 and the limiting baffle 6, respectively. At the same time, two guide holes 8 are also provided on the cross arm body 3, and the two guide holes 8 are respectively arranged on the radial sides of the cross arm hole 9 along the axial direction, passing through the axial ends of the cross arm body 3, and connecting the upper joint 2 with the central water hole on the lower joint 4.

[0016] In actual production, when the oil well drilling tool cross arm short section assembly described in this embodiment is used to cut the oil well casing, the cutting tool is first connected to the drilling tool drill pipe, and a drilling tool cross arm short section is connected and installed at the upper end of the drilling tool drill pipe. Then, the drilling tool cross arm short section is connected to the square drill pipe, and the drilling tool drill pipe is suspended and sent into the well by the derrick traveling carriage. When the drilling tool drill pipe is put into the well as a whole and the drilling tool cross arm short section reaches the wellhead surface, the drilling tool drill pipe is stopped from being sent down, and the arm 1 is inserted into the cross arm body 3. After confirming that the cross arm hole 9 is inserted into the cross arm hole 9 opened on the well, the limit stopper 6 is installed to the insertion end of the cross arm 1, and then the drilling tool drill pipe is slowly sent down until the cross arm 1 is cross-armed at the wellhead and laid flat on the wellhead platform, so that the cross arm 1 can balance the drilling tool drill pipe by cooperating with the drilling tool cross arm short section, and the drilling tool drill pipe is hung on the wellhead of the oil well; after that, the connection between the square drill rod and the drilling tool cross arm short section is released, and then another drilling tool cross arm short section and another drill string are connected to the wellhead. The square drill rods are connected in sequence, and the combined component of the drill tool cross arm short section and the drill string is hoisted to the wellhead by the derrick traveling carriage, and the lower end of the drill string is connected to the drill tool cross arm short section at the wellhead of the oil well, and the drill rod of the drill tool is lightly lifted, and the shoulder rod 1 is disassembled and pulled out from the cross arm hole 9, and the bearing function of the shoulder rod 1 is released, and the drill rod of the drill tool is continuously sent down by the derrick traveling carriage until another drill string is completely entered into the well and another drill tool cross arm short section reaches the wellhead surface, and the sending down is stopped again. The drill pipe of the drilling tool is also suspended on the wellhead of the oil well by using the support rod 1. Thereafter, the above operations are repeated in sequence, and the drill pipe cross arm short section and the structural components of the drill string are continuously connected to the drill pipe of the drilling tool and thrown into the well until the cutting tool reaches the cutting operation area underground. The cutting tool can be started to cut the oil well casing. Since the diversion hole 8 opened on the cross arm body 3 can keep the fluid flow channel of the drilling tool pipe continuously unobstructed, the underground cutting operation can be ensured to be completed smoothly. After the cutting operation is completed, the drilling tool drill pipe is hoisted by the derrick traveling carriage. When one of the pipe strings is out of the well as a whole and the drill tool cross arm short section connected to the pipe string reaches the wellhead surface, the hoisting is stopped, and the carrying rod 1 is used to cooperate with the drill tool cross arm short section to suspend the drill tool drill pipe on the wellhead platform, and then the connection between the pipe string and the drill tool cross arm short section is released and the pipe string is disassembled and removed from the square drill pipe. Thereafter, the drill tool cross arm short section on the wellhead surface is connected to the square drill pipe, and the drilling tool drill pipe is continued to be hoisted by the derrick traveling carriage. When the next pipe string and the drill tool cross arm short section connected thereto are lifted out of the well, the above operation is repeated to disassemble and remove the pipe string, and this cycle is repeated until all the drilling tool drill pipes are lifted out of the well, thus completing the downhole cutting operation of the oil well casing.

Claims

1. An oil well drilling tool cross arm short section assembly, characterized in that: include: A drilling tool cross arm short section and a shoulder bar (1), wherein the drilling tool cross arm short section further comprises: an upper joint (2), a cross arm body (3) and a lower joint (4); the upper joint (2), the cross arm body (3) and the lower joint (4) are connected in sequence, and a connection structure is respectively provided at the upper end of the upper joint (2) and the lower end of the lower joint (4); the cross arm body (3) is provided with a guide hole (8) in the axial direction, and the guide hole (8) axially penetrates through both ends of the cross arm body (3); a cross arm hole (9) is provided in the radial direction, and the cross arm hole (9) passes through the cross arm body (3) horizontally through the axis; the shoulder bar (1) is a load-bearing rod body, and the cross-sectional shape of the rod body corresponds to the cross-sectional shape of the cross arm hole (9); after the shoulder bar (1) is inserted into the cross arm hole (9), the shoulder bar (1) can be made to balance the bearing of the drilling tool cross arm short section.

2. The oil well drilling tool cross arm short section assembly according to claim 1, characterized in that: A control handle (7) is installed at one end of the crossbar (1), and a fixed baffle (5) is also provided in combination, wherein the minimum plate diameter of the fixed baffle (5) is greater than the maximum hole diameter of the crossbar hole (9).

3. The oil well drilling tool cross arm short section assembly as claimed in claim 2, characterized in that: A limit baffle (6) is provided at the other end of the carrying bar (1) opposite to the end where the fixed baffle (5) is provided, the minimum plate diameter of the limit baffle (6) being larger than the maximum hole diameter of the cross arm hole (9), and the limit baffle (6) is connected and installed on the rod body of the carrying bar (1) in a detachable manner.

4. The oil well drilling tool cross arm short section assembly according to any one of claims 1 to 3, characterized in that: The shoulder bar (1) and the cross arm hole (9) are plug-fitted into each other in a cross-section circumferential limiting manner.

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