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Well track optimization and risk prevention method

A wellbore trajectory and risk technology, which is applied in wellbore/well components, earthwork drilling, directional drilling, etc., can solve problems such as difficulty and reduced effectiveness of measured data, so as to improve drilling safety and reduce the occurrence of complex situations Effect

Pending Publication Date: 2022-04-12
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

However, in strata with complex fractures, it is necessary to obtain the strength parameters of the rock body and fracture surface through experiments at different intervals, which is difficult to obtain through experiments, and when large-scale fractures are drilled, lost circulation or collapse will lead to the validity of measured data. reduce

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  • Well track optimization and risk prevention method

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Embodiment Construction

[0053] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0054] Step 1: For a certain well area, the seismic data of the well block are collected and processed with high resolution to obtain the characteristics of formation fractures, including fracture distribution information and fracture scale information, and divide the fractures into different grades according to the fracture scale information; 10 meters belong to class I cracks; 1 to 10 meters belong to class II cracks; less than 1 meter belongs to class III cracks;

[0055] Step 2: According to the real drilling data of the block, analyze the vertical depth intervals that are prone to complex situations, and now focus on one of the intervals [1000,1100], specifically as follows figure 2 The risk range and risk space shown;

[0056] Step three: image 3 It is a schematic diagram of the objects to be optimized, different types of comparison...

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Abstract

The invention discloses a borehole trajectory optimization and risk prevention method, and belongs to the technical field of petroleum and natural gas drilling. The method is characterized by comprising the following steps: firstly, collecting and processing seismic data of a to-be-drilled well block, and identifying and grading cracks; meanwhile, well drilling complex conditions and occurrence vertical depth intervals are counted according to real drilling data of the blocks; marking the vertical depth interval as a risk interval of a to-be-drilled well, further establishing a risk space, and determining equations of an object to be optimized and a comparison object in the space under a three-dimensional coordinate system; and finally, comparing the calculated minimum distance between the to-be-optimized object and the comparison object with the safe distance, optimizing the well track, and taking risk prevention measures. According to the method, the fractures are graded and regularized, the risk is identified through the position relation between the well track and the fractures, and the well drilling safety and the well drilling efficiency are improved by optimizing and taking precautionary measures.

Description

technical field [0001] The invention belongs to the technical field of oil and natural gas drilling, and in particular relates to a wellbore trajectory optimization and risk prevention method. Background technique [0002] Wellbore trajectory optimization is an important part of drilling engineering. With the exploration and development of oil and gas, technical difficulty and stratum complexity increase, and drilling complex situations occur frequently, resulting in increased drilling costs and drilling cycles. In order to achieve safe and efficient drilling operations, it is necessary to further design and optimize the wellbore trajectory in combination with formation characteristics. At present, scholars at home and abroad mainly use seismic data to describe formation characteristics, and use techniques such as compressed sensing to re-identify small-scale fractures in formations. When drilling through fractures, it is necessary to optimize the wellbore trajectory with ri...

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Application Information

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IPC IPC(8): G06Q50/02G06Q10/04G06Q10/06E21B7/04E21B33/13E21B33/138
Inventor 曾德智王熙周苗鹏罗江金龙易浩周效民程地奎
Owner SOUTHWEST PETROLEUM UNIV
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