Analysis chart method for horizontal well landing
A technology for analyzing diagrams and horizontal wells, applied in complex mathematical operations, instruments, character and pattern recognition, etc., which can solve problems affecting horizontal section operations and poor landing trajectory shapes, so as to improve decision-making analysis efficiency, reduce calculation errors, and improve The effect of forecast accuracy
Pending Publication Date: 2021-07-30
CNOOC ENERGY TECH & SERVICES
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Problems solved by technology
Therefore, there are problems such as the difference in personnel experience affecting the prediction accuracy, resulting in poor landing trajectory shape and affecting horizontal section operations.
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[0043] A method for analysis charts of horizontal well landing is carried out according to the following steps:
[0044] a. Comparison of well logging curves
[0045] The morphological characteristics of the LWD curves of the ongoing drilling well and the adjacent well logging curves are compared and analyzed to realize the formation position correction of the ongoing drilling curves relative to the adjacent well curves. Well logging curves are not limited to a specific logging item. In this case, gamma logging curves are used for comparison. figure 1 a is the offset well curve, figure 1 d is the positive drilling curve, taking the positive drilling logging curve as a sample, traversing the different depth positions of adjacent wells for similarity search and comparison, and calculating the Pearson correlation coefficient of the two curves (Formula 1), x i with y i is the sample value of the discrete sequence of different logging curves, and N is the number of sequence sa...
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The invention discloses an analysis chart method for horizontal well landing, and the invention achieves the automatic analysis and prediction of the horizontal well landing operation through a series of algorithms, and reduces the calculation error caused by the experience difference of personnel. According to the invention, the target stratum position of the drilling well is predicted through comparison of multiple adjacent well marker beds, and the target stratum position prediction precision is improved; the invention provides a landing window calculation method, and quantitative calculation is carried out on drilling trajectory control by calculating vertical depths of upper and lower boundaries; according to the analysis chart method for the landing operation of the horizontal well, geological prediction analysis and engineering operation implementation are organically combined, operators with different professional backgrounds can conveniently and rapidly obtain key information of the landing operation, process control over the landing operation is achieved, and decision analysis efficiency is improved.
Description
technical field [0001] The invention relates to the technical field of upstream exploration and development of oil, natural gas, etc., and in particular relates to a method for analysis charts of horizontal well landing. Background technique [0002] Horizontal well borehole trajectory control includes two key well sections, the landing section and the horizontal section. The landing section is the basis of the horizontal section operation, and a good landing operation can reduce drilling risks such as sidetracking due to drilling through the reservoir and substantial adjustment of the wellbore trajectory at the initial stage of the horizontal section. Block operators often employ geosteering drilling techniques to support landing operations to increase their success rates. [0003] The horizontal well landing operation essentially refers to placing the drilling trajectory in the target layer at the correct depth, inclination and azimuth. For this reason, the landing opera...
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Login to View More IPC IPC(8): G06K9/00G06F17/11
CPCG06F17/11G06F2218/08G06F2218/12
Inventor 苑仁国林昕韩雪银谭伟雄陈玉山于忠涛苏朝博罗鹏董潇琳刘卓佟昕航
Owner CNOOC ENERGY TECH & SERVICES