A method for joint calculation of the distance from the borehole to the formation boundary in horizontal wells with multivariate data

Abstract

The invention provides a method for utilizing multivariate data to achieve the joint calculation of the distance from a borehole to a stratum boundary in a horizontal well. The method comprises the steps of 1, collecting and preprocessing the multivariate logging data; 2, utilizing the logging data for interface identification, and automatically conducting horizon division; 3, utilizing azimuth imaging data to calculate the borehole-stratum relative inclination angle and azimuth angle at the position cross an interface, and calculating the boundary distance according to the inclination angle;4, establishing an inversion model, and calculating the borehole-boundary distance of the position away from the boundary section by section; 5, summarizing inclination angle data at the boundary andinversion layer boundary distance data of the position away from the boundary, and obtaining the borehole-boundary distance of each measurement point of the horizontal well according to nonlinear interpolation. By means of the method, the borehole-stratum boundary distance information can be obtained from the logging data, so that the method is a data processing technology urgently needed in production; meanwhile, the detection advantages of various types of logging data are fully exerted and comprehensively utilized and complement one other, and the efficiency of utilizing the logging data isimproved.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a technique for jointly calculating the distance from a wellbore to a stratum boundary with multiple data in a horizontal well. Background technique [0002] With the massive exploitation of oil, the monolithic oil and gas reservoirs gradually decreased, and the complex and difficult-to-move oil and gas reservoirs gradually increased. At the end of the 20th century, in order to meet the development needs of the petroleum industry, especially to improve drilling efficiency and reservoir recovery, water Hirai geosteering technology has gradually developed. In the early 1980s, with the maturity of directional well technology and the application of new downhole tools and instruments, horizontal well drilling entered a period of vigorous development. Logging while drilling has become an important means of reservoir evaluation for highly deviated wells, horizontal wells a...

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Problems solved by technology

[0005] However, in the environment of horizontal wells and highly deviated wells, the LWD curve is affected by various environmental factors, and the measured data cannot directly obtain the distance from the borehole to the formation.

[0006] In fact, well logging data is affected by multiple environments, and the measured value itself does not directly indicate the distance between the wellbore and the layer boundary. It is difficult to determine the distance between the wellbore and the layer boundary in engineering applications, which affects the optimization of the geosteering well trajectory and the later calculation of reserves.

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