Three-dimensional horizontal well borehole trajectory design method

Abstract

The invention relates to a three-dimensional horizontal well borehole track design method in borehole track design in petroleum drilling. The three-dimensional horizontal well borehole track design method comprises the steps of pre-drilling design and while-drilling design of a drilling borehole track. According to the main technical method, the borehole track section composition is changed into six-section track composition namely the straight-increasing-stabilizing-torque-increasing (torque-increasing)-leveling, the direction is adjusted to the direction of a designed target point connectingline in advance by a certain well section or vertical depth, and the last whipstock section is designed to be a well section with a small build-up rate. And theincreasing and increasing (twisting) well sections in the six sections of tracks are calculated through an inclined plane arc method. Through the six-section well track design of straight-augmentation-stability-augmentation (torsion)-augmentation-leveling , the three-dimensional horizontal well track can be designed, and the well track designed through the method is beneficial to overcoming the uncertainty of the oil deposit vertical depth and the target-front build-up rate, the field well track control capacity is improved, and the smooth implementation of three-dimensional horizontal well construction is ensured.

Description

technical field [0001] The invention relates to the wellbore track design in the technical field of petroleum drilling, in particular to the pre-drilling design and drilling-while-drilling design of the wellbore track. Background technique [0002] In recent years, subject to the limitation of the drilling ground site and the purpose of special oil reservoir exploration and development, the demand for 3D horizontal wells is increasing, and drilling operations are increasing. The development practice has proved that 3D horizontal well drilling technology can solve the limited surface engineering It is one of the effective technologies for efficient development of low porosity and low permeability oil and gas reservoirs. The use of three-dimensional horizontal well groups is conducive to maximizing the exposure of oil and gas layers, increasing the drainage area of ​​oil and gas reservoirs, improving the quality of well pattern deployment, thereby increasing the recovery of oi...

AI Technical Summary

Problems solved by technology

[0003] The borehole trajectory design and control technology of 3D horizontal wells is different from that of 2D horizontal wells. 3D horizontal wells have strict requirements on the inclination angle and azimuth angle of the target well. It is equivalent to adding constraints on the mathematical model, thus increasing the difficulty and complexity of the problem, often bringing certain resistance to design and site construction

Both the borehole curvature and device angle of the cylindrical spiral method and the natural parameter method are changing. If the borehole curvature and device angle of each well section are constantly changing during field construction, the difficulty of wellbore trajectory control will be greatly increased. Therefore, Not suitable for selection

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