Radial horizontal well orienting device and method for operating same

Abstract

The invention discloses a radial horizontal well orienting device and a method for operating the same. The radial horizontal well orienting device and the method are designed for achieving the purpose of arranging a plurality of casing windows on a string at one step. The radial horizontal well orienting device is characterized in that an oil string and a steering rod are connected with a steering barrel of the device, the steering rod is connected with a steering gear, and guide pins of the steering barrel are inserted into guide slide grooves of the steering rod; when the oil string is lifted upwardly and placed downwardly and the steering barrel is driven to move up and down, the guide pins generate lateral thrust in the guide slide grooves, and the steering gear is pushed to realize a steering effect. The radial horizontal well orienting device and the method have the advantages that the radial horizontal well orienting device and the method are mainly applied to radial horizontal well operation for drilling a plurality of wells on the same oil layer, the complicated oriented windows can be arranged on a radial well without cable or down-hole electric device descending, well descending, azimuth measuring and multi-azimuth radial horizontal well orienting can be completed at one step only by the aid of the simple mechanical device, positioning and orienting are accurate, an operation procedure is simple, the operation cost is low, and the operation efficiency and accuracy are high.

Description

technical field [0001] The invention relates to a radial horizontal well directional device and an operation method thereof, belonging to the technical field of oil drilling and production. Background technique [0002] Radial horizontal drilling, also known as ultra-short radius horizontal well, was first produced in the 1980s. This technology was proposed on the basis of coiled tubing technology, equipped with special key drilling tools (mainly including jet drill bit, trajectory control device, steering gear, etc.) etc.), in the reservoir section of the main wellbore that has been drilled, one layer to multiple radially branched micro wellbores can be drilled. It can turn from vertical to horizontal in the vertical wellbore with a radius of 0.3m or less, and can avoid the process of frequent deflection, orientation and complex wellbore trajectory control required by the conventional large, medium and small curvature radius drilling horizontal well technology , to ensure ...

AI Technical Summary

Problems solved by technology

[0004] The main disadvantage of this technology is: after completing a wellbore, it is necessary to unbolt the anchor, and rotate the tubing on the ground to orient the downhole steering gear. Since the length of the tubing between the surface and the downhole steering gear is thousands of meters or even thousands of meters, the direction is difficult to control. The angle is difficult to grasp (in actual operation, the error is usually not more than 5°), and every time it rotates, the gyroscope needs to be lowered to measure the orientation. The process is cumbersome, the orientation is not accurate, and the operation efficiency is low.

[0005] In recent years, with the development of radial and horizontal well technology, its operation methods and drilling tools have been greatly improved. The following cable method is used to control the rotation of the downhole motor to determine the orientation. However, these devices have complex structures, high manufacturing costs, and poor stability. It is easy to fail in complex downhole environment, and the operation process is increased and the efficiency is reduced by lowering the cable

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