Fast and fine geological orientation method for shale gas horizontal well

A fine geology, horizontal well technology, applied in drilling equipment and methods, directional drilling, earthwork drilling, etc., can solve the problems of poor universality, unfavorable replication and promotion, etc., and achieve obvious effects.

Active Publication Date: 2017-06-20
CHINA PETROLEUM & CHEM CORP +3
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Problems solved by technology

[0002] The currently popular geosteering method is mainly based on the comparison results of the drilled well data and the well to be steered to guide the drill bit to travel through the target interval. Geological modeling is mostly two-dimensional. The steering method is applicab...

Method used

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  • Fast and fine geological orientation method for shale gas horizontal well
  • Fast and fine geological orientation method for shale gas horizontal well
  • Fast and fine geological orientation method for shale gas horizontal well

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Embodiment Construction

[0049] The invention firstly collects data, determines the guideline comparison standard well and reference well, determines the guideline marker layer and predicts the target point, and then divides the whole guideline real-time tracking process into geological modeling, formation comparison, determination and adjustment of target point, and control of the horizontal section well. There are four parts of the eye track, and the effect evaluation is performed after the guidance is completed.

[0050] The present invention will be described in detail below with reference to the accompanying drawings.

[0051] refer to figure 1 , figure 2 , image 3 , concrete steps and workflow of the present invention are as follows:

[0052] The first step: collect data, determine the steering comparison standard well and reference well

[0053] 1) Pre-drilling data collection, including the geological structure map of the well area, the drilling logging and mud logging data of adjacent w...

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Abstract

The invention relates to a fast and fine geological orientation method for a shale gas horizontal well. Materials are collected, an orientation comparing standard well and a reference well are determined, and an orientation sign layer and a target spot predicting scheme are determined; a well zone two-dimensional geological orientation model and a well zone three-dimensional geological orientation model are built and regulated, and a two-dimensional vertical section and the three-dimensional geological orientation model of a well to be oriented are amended in time; by means of the characteristics of lithological characters, well deflection, while-drilling gamma and the like of the well to be oriented, the standard well and the reference well, stratum comparing is conducted; the position where a drill is located is judged through three figures, one table and the like; whether the position where the drill is located is in a high-quality shale gas layer section or not is evaluated while drilling; whether an initial geological model is applicable or not is judged; through an equal-thickness comparing method a target spot A is determined and regulated, a target spot B is predicted, and a track of a borehole in a horizontal section is controlled; and the pass-through rate of a high-quality shale gas layer is calculated according to the statistic drilling-meeting thicknesses of a shale reservoir and a high-quality shale reservoir, whether the track is controlled to reach the target spot B or not is judged, and the fast geological orientation effect is evaluated. Fast orientation is achieved, the application range is wide, and application and popularization are easy.

Description

technical field [0001] The invention belongs to the technical field of horizontal well drilling for shale gas exploration and development, and in particular relates to a fast and precise geosteering method for shale gas horizontal wells. Background technique [0002] The currently popular geosteering method is mainly based on the comparison results of the drilled well data and the well to be steered to guide the drill bit to travel through the target interval. Geological modeling is mostly two-dimensional. The steering method is applicable to specific blocks or specific formations and is universal. Poor performance is not conducive to replication and promotion in other work areas. There is an urgent need to study a geosteering method that is easy to operate and easy to popularize and apply in the field in China. [0003] CN105464592A discloses a geosteering method for a shale gas horizontal well, which includes the following steps: according to the lithology and electrical c...

Claims

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Application Information

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IPC IPC(8): E21B7/04
CPCE21B7/046
Inventor 杨国圣胡德高刘尧文王振兴潘军廖勇冯爱国何文斌徐向叶应贵叶鑫卢坤辉谭淙文赵红燕陈四平石元会
Owner CHINA PETROLEUM & CHEM CORP
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