A device for reducing drag and centering in the circumferential direction
A centering device, a technology in the circumferential direction, applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problem of inconsistent perforation depth and diameter, affecting production effect, and insufficient maximum potential of perforating bullets Play and other issues to achieve the effect of solving the problem of frictional resistance
Active Publication Date: 2017-05-24
大庆华翰邦石油科技有限公司
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AI Technical Summary
Problems solved by technology
At present, there is no more effective method to reduce the large frictional resistance between the pipe string and the casing when it rotates around the axis
[0005] 3. Due to the inclination or deformation of the casing, the perforating string is not at the center of the casing for perforation, the maximum potential of each bullet is not fully utilized, and the depth and diameter of the perforation are inconsistent, which affects the later production Effect
However, this device has no central hole, and cannot realize the function of rotating around the axis
Method used
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[0023] Such as Figure 1 to Figure 3 As shown, the present invention is a drag reducing and centering device in the circumferential direction, which includes a male joint 1 and a female joint 2 connected to each other through threads, and the outer ends of the male joint 1 and the female joint 2 are respectively connected with the perforating gun 3, A through hole 4 is provided at the center of the male joint 1 and the female joint 2, and a rotating body 5 that can rotate around the axis of the male joint 1 and the female joint 1 is installed between the male joint 1 and the female joint 2. The rotating body 5 The first bearing 6 that is concentric with the axis of the male joint 1 is set on the male joint 1. At least three rolling bearings 7 are arranged on the rotating body 5. The rolling bearings 7 are installed on the rotating body 5 through a pin shaft 8. The axes of the rolling bearings 7 are perpendicular to the male joint. The axis and radial line of the joint 1, and t...
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The invention discloses a device for achieving resistance decrement and centering in the peripheral direction. The device comprises a male connector and a female connector which are connected with each other through threads. The outer end of the male connector and the outer end of the female connector are connected with perforating guns respectively. Through holes are formed in the center of the male connector and the center of the female connector. A rotator capable of rotating around of the axis of the male connector and the axis of the female connector is arranged between the male connector and the female connector and is arranged on the male connector through a first bearing concentric with the axis of the male connector in a sleeved mode. Six rolling bearings are installed on the rotator through pin rolls, and the outer edges of the rolling bearings protrude out of the outer edge of the male connector and the outer edge of the female connector. By the application of the device for achieving resistance decrement and centering in the peripheral direction, when the perforating pipe column is lowered to a target layer in an oil well casing pipe, the problems that frictional resistance is generated between the perforating pipe column and the casing pipe in the lowering process in the traditional technology, the perforating pipe column can not rotate around the axis and the perforating pipe column can not be kept located in the center of the casing pipe all the time are effectively solved.
Description
technical field [0001] The invention relates to the technical field of perforation and completion of oil and gas wells, in particular to a drag reducing and centering device in the circumferential direction. Background technique [0002] At present, in the conventional perforating and completion operation of oil and gas wells, the perforating string connected by one or more perforating guns is first lowered into the oil well casing, and reaches the target layer for perforation. During the lowering of the pipe string, the following problems exist: [0003] 1. Due to the inclination or deformation of the casing, the pipe string is deflected in the casing, and sliding friction resistance is generated with the inner wall of the casing. The larger the casing inclination, the greater the sliding resistance during lowering. [0004] 2. During the perforation operation of horizontal wells and high-inclination directional wells, the pipe string not only needs to slide in the casing,...
Claims
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IPC IPC(8): E21B43/119
Inventor 马新民马子贺雷跃生
Owner 大庆华翰邦石油科技有限公司