Window opening and sidetrack drilling short-radius horizontal well and reverse circulation well cementing and water plugging method

Abstract

The invention relates to secondary productivity development of old wells and shut-down wells in oil fields and provides a window opening and sidetrack drilling short-radius horizontal well and reverse circulation well cementing and water plugging method. The method mainly includes the following six steps that: 1) a window opening point is selected; 2) a well trajectory is designed; 3) a whipstock is positioned and set; 4) casing window cutting operation is performed; 5) well trajectory control is performed; and 6) well completion operation is performed. The method of the invention can be applied to the secondary development of a part of low-yield wells and scrapped shut-down wells, can effectively obtain stored oil and residual oil in dead corners in uncontrolled areas of old wells, and can restore and improve single well production and ultimate recovery efficiency.

Description

technical field [0001] The invention belongs to the field of oilfield directional drilling, and relates to a window-opening sidetracking short-radius horizontal well and a reverse circulation cementing water blocking method used for secondary productivity development of old oilfield wells and shut-in wells, and covers a casing windowing process, In the fields of horizontal well technology, small hole drilling technology, well completion technology, reverse circulation cementing technology and the like, the invention can effectively improve the recovery rate of some low-yield wells and scrapped shut-in wells in oil areas. Background technique [0002] After years of exploration and development, there are usually a large number of low-yielding wells and shut-in old wells in oilfields, and most shut-down old wells still have remaining oil-rich areas. In order to effectively obtain the oil storage and residual oil in the uncontrolled area of ​​the old well and improve the overal...

AI Technical Summary

Problems solved by technology

In order to effectively obtain the oil storage and residual oil in the uncontrolled area of ​​old wells and improve the overall oil recovery rate of the oilfield, most of the conventional directional wells with small holes combined with positive circulation cementing technology are used for secondary development, which is difficult and risky

In addition, because conventional directional wells directly drill into water layers, water flooding accidents in production layers are prone to occur after well completion, resulting in reduced productivity or zero output, which pushes up production costs

[0003] In order to overcome the problems existing in the prior art, the present invention proposes a method of sidetracking short-radius horizontal wells with window opening and reverse circulation cementing water plugging method, which can not only make full use of the existing old well boreholes to reduce production costs, but also revive the dead The original well pattern is maintained and improved, the sidetracking point is selected below the water layer and the reverse circulation cementing is implemented to seal the water layer, so as to effectively solve the problem of interference to productivity caused by the upper water layer channeling after completion

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