Deep horizontal well drilling track regulating method

An adjustment method and horizontal well technology, applied in directional drilling, wellbore/well components, earthwork drilling and production, etc., can solve the difficulties of reservoir prediction and well location deployment, the difficulty of geological tracking and steering while drilling, and the risk of gas well reaching production High-level issues, to achieve significant economic and social benefits, improve development efficiency, popularize and apply significant effects

Active Publication Date: 2015-10-14
CHINA PETROCHEMICAL CORP +4
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Problems solved by technology

However, for ultra-deep horizontal wells, it is not only difficult to predict reservoirs and deploy wells,

Method used

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  • Deep horizontal well drilling track regulating method
  • Deep horizontal well drilling track regulating method
  • Deep horizontal well drilling track regulating method

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[0033] The horizontal section of the horizontal well is defined by the first target point and the second target point. Drilling into the target layer, that is, before reaching the first target point is called before entering the target, and after reaching the first target point is called after entering the target. The method for adjusting the drilling trajectory of a deep horizontal well according to the present invention generally includes the following processes:

[0034] ① Optimize and adjust the trajectory of horizontal wells before entering the target through prediction of reservoir depth while drilling. Of course, the prediction of reservoir depth while drilling can also be combined with the approach control of marker layers. A landmark layer refers to a layer or a group of rock layers with obvious and unique characteristics that can be traced or compared as a strata.

[0035] ②By "searching for dolomite, long-through high-quality reservoirs, controlling the difference betw...

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Abstract

The invention discloses a deep horizontal well drilling track regulating method, which comprises the following steps of: before the drilling of a drilling well, using an adjacent well speed field for predicting the main formation limit depth of the drilling well; before the drilling to a target layer, virtualizing the drilling well into a pilot well; obtaining the actual formation limit depth of the drilling well and a quarto well logging curve while drilling; correcting the deep formation limit at the main formation depth obtained before the drilling according to the obtained actual formation limit depth, and obtaining a corrected marking layer depth; performing the putting into a seismic profile according to the obtained quarto well logging curve in accordance with the marking layer so as to reverse the speed field of the drilling well; predicting the depth of the target layer of the drilling well according to the speed field of the drilling well; and regulating the drilling track set in the last time if the difference of the current predicted depth of the target layer and the depth of the target layer predicted in the last time is greater than the preset deviation threshold. The method has the advantages that the Yuanba horizontal well track optimization and regulation are effectively guided, and the effective reservoir drilling ratio is improved.

Description

technical field [0001] The invention relates to a method for controlling the drilling trajectory of a horizontal well, in particular to a method for adjusting the drilling trajectory of a deep horizontal well. Background technique [0002] The Changxing Formation gas pool in the Yuanba gas field is a lithologic gas pool with ultra-deep layers, edge (bottom) water locally, and controlled by reefs and shoals. The research shows that the reefs and shoals of the Changxing Formation are small and scattered, the overall reservoir is thin, the vertical and horizontal heterogeneity is strong, the connectivity is poor, and the thickness plane changes greatly; the gas-water relationship in the gas reservoir is complex, and different reefs and shoals are not unified The gas-water interface is a relatively independent gas-water system; the production and well-controlled reserves of vertical wells generally do not meet the economic limit requirements, and the gas field development plan d...

Claims

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Application Information

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IPC IPC(8): E21B7/04E21B47/04E21B47/00
Inventor 刘言张继果彭光明潘晓东何莹冉飞简高明王平李昌峰陈清贵李建荣温善志衡小明
Owner CHINA PETROCHEMICAL CORP
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