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

A window sidetracking and short-radius technology, applied in directional drilling, wellbore/well components, earthwork drilling and production, etc., can solve problems such as high production costs, high risks, and water flooding accidents in production zones

Inactive Publication Date: 2015-08-12
BEIJING YILONG HENGYE PETROLEUM ENG TECH
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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 p...

Method used

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

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Embodiment Construction

[0024] The following takes the K202S well as an example to specifically describe the construction flow of the process of the present invention.

[0025] 1. Selection of window opening point

[0026] Considering the geological conditions of the KAM oilfield block, the mining method, the window opening method, and the vertical distribution of oil and water, it is preferred that the forging-milling window position of Well K202S is 1154-1167m, and the window length is only 13m. During the on-site construction, the actual window opening point is located at 1160m.

[0027] 2. Wellbore Trajectory Design

[0028] The basic data of wellbore trajectory design of Well K202S are shown in Table 1. The specific conditions are as follows: First, from the 1163m oblique depth at the opening point to the 1186m oblique depth, conventional drilling tools are used for compound drilling along the inclined plane of the oblique device, and the build rate is 0; 21.30° / 30m, which is mainly due to th...

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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...

Claims

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Application Information

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IPC IPC(8): E21B29/06E21B7/04E21B33/13
Inventor 杜东波张建军
Owner BEIJING YILONG HENGYE PETROLEUM ENG TECH
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