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A Downhole Pulling Device Used in Wireline Logging to Avoid Pressure Differential Stuck

A traction device and wireline logging technology, applied in wellbore/well components, measurement, construction, etc., can solve problems such as logging failure and inability to continue to run down, and achieve easy installation and operation, simple structure, and avoidance of pressure difference. card effect

Active Publication Date: 2022-04-22
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In wireline logging of directional wells, more mud cakes will be attached to the borehole wall of the open hole section. The instrument is stuck in the well section and cannot be lowered further, resulting in logging failure

Method used

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  • A Downhole Pulling Device Used in Wireline Logging to Avoid Pressure Differential Stuck
  • A Downhole Pulling Device Used in Wireline Logging to Avoid Pressure Differential Stuck
  • A Downhole Pulling Device Used in Wireline Logging to Avoid Pressure Differential Stuck

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0021] Such as figure 1 , figure 2 , image 3 , Figure 4 , shown, a kind of downhole traction device that is used for wireline logging to avoid differential pressure to get stuck, comprises end cap (1), end cap screw (2), logging cable (3), motor (4), motor shaft ( 5), motor gear (6), reduction gear (7), gear shaft (8), incomplete gear (9), deep groove ball bearing (10), rack (11), sensor (12), swing plate ( 13), push rod (14), swing rod (15), base (16), swing rod support (17), support screw (18), fastening screw (19), base screw (20) and Slotted cylindrical head screw (21); the sensor (12) transmits the signal to the motor (4) after touching the well wall or mud cake, and the motor (4) starts and transmits the power through the motor shaft (5) through the key connectio...

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Abstract

The invention relates to a downhole traction device for cable logging in the oil drilling industry to avoid pressure differential jamming, which includes a motor, a motor gear, a reduction gear, an incomplete gear, a rack, a push rod, a swing rod, a swing plate, a sensor, and the like. When the sensor comes into contact with the well wall or mud cake, it transmits a signal to the motor. The logging cable provides power for the motor to drive the motor gear to rotate. Both the motor gear and the reduction gear are bevel gears, which are driven by meshing. The uniform rotation of the incomplete gear coaxial with the reduction gear makes the rack reciprocate. Through the push rod transmission, the pendulum rod uses the pendulum piece to act on the well wall or mud cake, so that the traction device is far away from the well wall or mud cake. Avoid the differential pressure of the logging device from getting stuck. The invention has the advantages of simple structure, low cost and novel creativity. The combination of incomplete gears, racks, push rods, swing rods and swing plates ensures the distance between the device and the mud cake, which is beneficial to avoid jamming due to differential pressure and ensure the completion of wireline logging.

Description

technical field [0001] The invention relates to the technical field of downhole tools in oil and gas fields, and relates to a downhole traction device used for cable logging to avoid pressure differential jamming. Background technique [0002] In order to obtain the actual downhole structure and various wellbore data in time, as well as obtain downhole actual information to ensure the smooth progress of subsequent drilling and production work, well logging is required. [0003] In wireline logging of directional wells, more mud cakes will be attached to the borehole wall of the open hole section. The instrument was stuck in the well section and could not be lowered further, resulting in logging failure. Therefore, preventing the logging instrument from getting stuck in the mud cake is an important condition to avoid the logging tool getting stuck due to the pressure difference. Well logging went smoothly. Contents of the invention [0004] The purpose of the present inv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/017E21B47/00
CPCE21B47/00
Inventor 毛良杰胡正惠聂荣国
Owner SOUTHWEST PETROLEUM UNIV