Method for realizing accurate oriented perforating by cable transmission

Abstract

The invention relates to a method for realizing accurate oriented perforating by cable transmission, and is applied to the orientation perforating of a casing pipe well of an oil field during well completion. The method comprises the following steps of: sinking a positioning device and setting; sinking a gyro inclinometer, and measuring the accurate orientation of a guiding key on the upper part in the positioning device; sinking a perforating gun, orienting accurately, and perforating; and lifting the positioning device and the perforating gun to realize accurate oriented perforating construction by the cable transmission. The method has the advantages that: the oriented perforating of a well of which the maximum well oblique angle of the whole well exceeds 15 degrees and a well oblique angle of a perforating section is less than 30 degrees is realized; the period of perforating construction is reduced to 8 hours from 30 hours for the oriented perforating by oil pipe transmission, and the construction efficiency is improved; and the oil pipe transmission is replaced by the cable transmission, so the labor intensity is reduced.

Description

technical field [0001] The invention relates to the technical field of oilfield well completion, in particular to a method for azimuth perforation in cased well completion, which is a method for realizing directional perforation in oil wells with a well inclination angle between 15° and 30°. Background technique [0002] There are two existing directional perforation techniques: when the maximum inclination angle of the whole well is less than 15°, directional perforation is realized through tubing transmission, gyro inclinometer measurement of azimuth, ground rotating tubing, etc. directional perforation is achieved through tubing transmission, eccentric weight orientation, etc. [0003] The directional perforating technology for vertical wells is relatively mature. The principle is to measure the direction of the downhole perforating gun through the gyro inclinometer, and rotate the tubing on the ground to drive the perforating gun to the designed position. The main steps...

AI Technical Summary

Problems solved by technology

This directional perforation method has two disadvantages: ①The resistance of the tubing to rotate at the wellhead is relatively large, and it cannot be applied when the maximum inclination angle exceeds 15°; ②The tubing transmission process is too complicated, the construction period is long, and the economic benefit is poor

This directional perforation method has two disadvantages: ①The radius of the wellbore is small, the torque provided by the deflector is small, the inclination angle is less than 30°, and the continuous length of the perforating gun is more than 10m, the positioning cannot be realized; ②The tubing transmission process is too complicated, Long construction period and poor economic benefits

For directional perforating wells in Changqing, the inclination angle of the oil layer section is generally less than 10°, but the maximum inclination angle of the whole well is generally 10-35°, and the continuous length of the perforating gun is generally 12-20m. Oriented perforation with central weight can not meet the needs of directional perforation in Changqing Oilfield

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