Special horizontal well track control method for oil reservoir with top water and edge water

A technology of wellbore trajectory and control method, applied in the field of oil drilling, can solve problems such as difficulty in preventing side and top water channeling, unable to meet the needs of safe development of oil wells and oil fields, etc., so as to prevent side and top water from invading oil layers and improve cementing quality Effect

Inactive Publication Date: 2009-05-06
CNPC GREATWALL DRILLING ENG
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AI Technical Summary

Problems solved by technology

The main problem of this kind of conventional wellbore trajectory is that it is difficult to prevent water channeling on the side and top, and it cannot meet the needs of safe development of oil wells and oilfields in the later stage

Method used

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  • Special horizontal well track control method for oil reservoir with top water and edge water

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Effect test

Embodiment

[0007] Embodiment: The horizontal well 84 and level 13 of the side-top water reservoir in block Du 84 of an oilfield adopt the above-mentioned wellbore trajectory control method of the present invention. The main parameters are as follows: well depth 1317m, maximum well deviation 100.6°, displacement 753.79m, horizontal Section 382m; control point slope depth 812m, vertical depth 678m, entrance target point slope depth 941m, vertical depth 660m, height difference 18m; maximum full angle change rate 11.19° / 30m, maximum full angle change rate from control point to entrance target point 11.9° / 30m.

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Abstract

The invention relates to a method for controlling a track of a well hole of a special horizontal well of an edge-top water reservoir. The method comprises the following steps: a fishhook-shaped well hole track is adopted in the drilling construction process of the horizontal well and a sidetrack horizontal well of the edge-top water reservoir; the well hole is drilled to mudstone of the lower part of the reservoir; well completion in the middle part of the mudstone realizes effective packing of the edge-top water of the upper part and ensures the safe drilling of the horizontal well section of the lower part. The method has main advantages that as a technical sleeve runs to a mudstone layer, the method can effectively prevent the edge-top water from invading an oil layer and can improve the well fixing quality of the technical sleeve in the middle well completion; and as the track of the well hole of the horizontal well is smooth, the normal running of the sleeve and a sieve tube is ensured.

Description

Technical field: [0001] The invention relates to a technique used for drilling construction of horizontal wells and sidetracking horizontal wells in oilfields, especially side-top water reservoirs, and belongs to the petroleum drilling technology category. Background technique: [0002] Edge water reservoir is one of the reservoir types often encountered in the field of oilfield development. Whether the wellbore trajectory of this type of reservoir is reasonable or not has a great influence on the production status of the oil well after it is put into production and the development effect of the reservoir. At present, when drilling horizontal wells or sidetracking horizontal wells in such reservoirs, the wellbore trajectory is usually similar to a semi-circular arc, directly drilling into the oil layer, and the deflection section of the wellbore uses three or four sections or even more. The trajectory well deviation gradually increases to the target well deviation. The mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/04
Inventor 许国荣李景辉刘青云唐亮律水净白东青张铁张微
Owner CNPC GREATWALL DRILLING ENG
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