Method for controlling drilling track of flagstone oil and gas reservoir horizontal well

Abstract

The invention discloses a method for controlling the drilling track of a flagstone oil and gas reservoir horizontal well, and belongs to the field of petroleum and natural gas exploitation. The methodfor controlling the drilling track of the flagstone oil and gas reservoir horizontal well includes the steps that after a target oil layer is determined, a drilling tool assembly and gamma well logging equipment arranged at the rear end of a drill bit are tripped in, and whether the drill bit drills in the target oil layer or not is judged according to the value domain of a gamma curve detected by the gamma well logging equipment; after the drill bit drills in the target oil layer, the drill bit is controlled to alternately drill at a first designated angle and a second designated angle according to the value domain of the gamma curve detected by the gamma well logging equipment until the drill bit penetrates out of the target oil layer; and each of the first designated angle and the second designated angle is the acute angle between the drilling track of the drill bit and the axis of the target oil layer. By means of the method, the well track can be located in the middle of the target oil layer, and on the premise of saving time and labor, the exploitation efficiency of oil and gas can be improved.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas exploitation, in particular to a method for controlling the drilling track of a horizontal well in a thin sandstone oil and gas reservoir. Background technique [0002] Thin sandstone oil and gas reservoirs refer to oil and gas layers with a thickness less than 3m, and the oil and gas layers are mostly horizontal oil and gas layers. With the deepening of exploration and development of oil and gas fields in my country, thin sandstone reservoirs have become exploration targets. The horizontal well drilling trajectory control method is the key to ensure the success of horizontal well drilling. Therefore, it is very necessary to provide a horizontal well drilling trajectory control method for thin sandstone oil and gas reservoirs. [0003] In the related technology, according to the geological interpretation of the seismic section obtained from the geological well in the oil field to be explo...

AI Technical Summary

Problems solved by technology

[0005] In the related technology, the specific position of the target oil layer and the drill bit can only be estimated based on the delayed mud logging data or data obtained by the comprehensive mud logging tool, which makes the drilling trajectory easy to deviate from the target oil layer

Images