Calculating method for SAGD (Steam-Assisted Gravity Drainage) double-horizontal well drilling electromagnetic distance measurement guide

Abstract

The invention relates to a calculating method for SAGD (Steam-Assisted Gravity Drainage) double-horizontal well drilling electromagnetic distance measurement guide, which mainly comprises the steps of acquired data processing, calculation of rotating magnetic short section far-field magnetic induction intensity, inclination measurement and calculation of well hole track, neighboring well paralleldistance calculation, and the like. In the extracting process of unconventional oil and gas resources, such as thickened oil, natural gas hydrate, and the like, the precise control on the SAGD double-horizontal well horizontal section distance is one of the key technical links. In the invention, as for the application background, an approach for combining an inclination measurement and calculation method of the well hole track and drilling electromagnetic detection is adopted for monitoring a space relative position relationship of the double-horizontal well horizontal section in real time. Firstly, the distance of the double-horizontal well horizontal sections is obtained by utilizing a magnetic signal generated by a rotating magnetic short section received by a probe; and then, the calculating method which can confirm the relative orientation of the double-horizontal well horizontal section is invented by utilizing the inclination measurement and calculation of the well hole track and the drilling electromagnetic detection signal. The invention not only can be applied to the SAGD double-horizontal well guide drilling well detection but also can be applied to multiwell collision preventing and three-dimensional hinder-crossing monitoring calculation.

Description

technical field [0001] The invention relates to an electromagnetic detection and calculation method while drilling for the spacing between adjacent wells of dual horizontal wells, which is one of the technical keys for steerable drilling control of SAGD dual horizontal wells, and belongs to the technical field of petroleum engineering. Background technique [0002] In the exploitation of oil, natural gas and coalbed methane, the drilling trajectories of complex structure wells such as double horizontal wells, connecting wells and U-shaped wells are complex, and the directional control is difficult, requiring accurate detection of the distance between adjacent wells while drilling. At present, the commonly used measurement-while-drilling tools in China cannot directly measure the distance of adjacent wells, so it is difficult to meet the special requirements of detection while drilling the distance of adjacent wells in complex structure wells. In addition, although foreign co...

AI Technical Summary

Problems solved by technology

At present, the measurement-while-drilling tools commonly used in China cannot directly measure the distance between adjacent wells, so it is difficult to meet the special requirements of detection-while-drilling for the distance between adjacent wells in wells with complex structures

In addition, although foreign countries have developed an electromagnetic guidance system while drilling that can basically meet the above requirements, its core technology is still kept secret and monopolized.

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