Auxiliary windowing process for performing oriented blasting perforation on thick-walled casing

Abstract

The invention relates to auxiliary windowing process for performing oriented blasting perforation on a thick-walled casing, belonging to the technical field of casing windowing side-drilling. The technical scheme is characterized by comprising the following step: deeply putting down a windowing whipstock to a pre-set windowing well section within the thick-walled casing and fixing the whipstock into the thick-walled casing; connecting a large-diameter special-made oriented windowing perforator to the lower end of a cable, deeply putting the perforator down above the windowing whipstock, rotating the cable such that an oriented oblique surface of the perforator is attached to a support oblique surface of the windowing whipstock such that a perforator hole in the surface of the large-diameter special-made oriented windowing perforator is aligned at the pre-set windowing position; controlling the large-diameter special-made oriented windowing perforator by the cable to perform high-density perforation on the thick-walled casing at the pre-set windowing position, forming dense holes in the thick-walled casing and cement ring-rock stratums in order to damage strength of the thick-walledcasing and cement rings. The thick-walled casing is drilled broken rapidly and efficient by use of a windowing milling awl in order to form an effective side-drilling window. Therefore, it is no longer difficult to perform windowing and side-drilling operation on the high-strength thick-walled casing. Operation is simple and reliable.

Description

technical field [0001] The invention relates to a casing auxiliary window opening process used in oil and gas field drilling and workover construction operations, and belongs to the field of casing window sidetracking technology. Background technique [0002] Casing window sidetracking technology is a new drilling and workover technology with development potential. It is an important means to develop remaining oil and gas reservoirs in special formations and improve oil and gas recovery. Casing window sidetracking technology mainly includes skewers Window opening and casing section milling window, among which the oblique device window is most widely used. Windowing of the oblique device is to fix a oblique device at the predetermined window opening position and azimuth of the original well, forcing the windowing bit to drill and mill towards the side of the casing, forming a window on the casing wall that can be drilled to the outside of the casing. The window opening metho...

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Problems solved by technology

[0003] The purpose of the present invention is: in order to solve the problems of long window opening period, high window opening difficulty, low window opening success rate, and serious wear of the milling cone bit in the sidetracking construction of high-strength thick-walled casing, so as to improve the high-strength The success rate of sidetracking with thick-walled casing window opening meets the needs of oilfield development in the middle and late stages. A directional blasting and perforating auxiliary window opening process for thick-walled casing is provided.

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