Horizontal segment core natural fracture parameter characterization method and system
A technology for natural fractures and parameter characterization, which is applied in earth-moving drilling, surveying, wellbore/well components, etc. It can solve the problems of high cost, difficult to achieve directional coring, underutilized data, etc., to reduce risk costs. Effect
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Embodiment 1
[0053] combine Figure 5A As shown, the crack 401 and the extending direction 403 of the horizontal section form a The inclination azimuth of the horizontal well is ∠α 1 . To calculate the fracture direction φ 1 , it is first necessary to determine which direction the fracture is inclined to in the horizontal section.
[0054] combine Figure 5B As shown, establish a coordinate system in which the horizontal section extension direction 403 is the horizontal axis, and the crack 401 passes through the origin of the coordinate system. At this time, the crack 401 or the extension line of the crack 401 falls into the first and third quadrants, so it is determined that the crack tends to extend to the horizontal section. direction;
[0055] according to Figure 5A It can be seen that Therefore, α can be 1 , Substituting into the first formula in formula (1) to calculate the fracture direction φ of the natural fracture 1 ,Right now
[0056] In addition, there are two ...
Embodiment 2
[0059] combine Figure 6A As shown, the crack 401 and the extending direction 403 of the horizontal section form a The inclination azimuth of the horizontal well is ∠α 2 .
[0060] combine Figure 6B As shown, since the crack 401 or the extension line of the crack 401 falls into the first and third quadrants, the crack tends to extend in the direction of the horizontal section;
[0061] according to Figure 6A It can be seen that Therefore, put α 2 , Substituting into the second formula in formula (1) to calculate the fracture direction φ of the natural fracture 2 ,Right now
[0062] In addition, there is another special case, when the crack 401 is perpendicular to the extending direction 403 of the horizontal section, that is, the crack 401 forms an angle of 90° with the extending direction 403 of the horizontal section, if the Then α can be 2 , Substituting into the second formula in formula (1) to calculate the fracture direction φ of the natural fracture ...
Embodiment 3
[0064] combine Figure 7A As shown, the crack 401 and the extending direction 403 of the horizontal section form a The inclination azimuth of the horizontal well is ∠α 3 .
[0065] combine Figure 7B As shown, since the crack 401 or the extension line of the crack 401 falls into the second and fourth quadrants, it is determined that the crack is inclined to the initial direction of the horizontal section.
[0066] Such as Figure 7A as shown, should be less than 360°, so the α 3 , Substituting into the third formula in formula (1) to calculate the fracture direction φ of the natural fracture 3 ,Right now
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