Thick layer glutenite horizontal well three-dimensional seam net fracturing optimization method

Abstract

The invention discloses a three-dimensional fracture network fracturing optimization method for horizontal wells in thick glutenite, and belongs to the technical field of hydraulic fracturing in oil and gas fields. First, optimize the wellbore trajectory, fracture spacing, number of segments, and plane fracture length of the horizontal well, and divide the affected area of ​​the reservoir into upper target area, intermediate target area and lower target area according to the layout of horizontal wells. Through reasonable optimization, According to the well factory development model, deploy as many horizontal well groups as possible on one platform to form a surface well factory; then optimize the length of the longitudinal fracture; finally optimize the height of the longitudinal fracture. In the end, a set of layer series and multi-layer development will be realized, considering the matching of fracture parameters between wells in the same layer on the plane and between layers in the vertical direction, establishing three-dimensional volumetric fractures, and maximizing the degree of reserve control. The method reduces the occupied area, reduces the high cost of land acquisition, is convenient for centralized drilling and fracturing management, avoids the communication of different horizontal wells during the fracturing construction process, and has a good production stimulation effect.

Description

Technical field [0001] The invention belongs to the technical field of oil and gas field hydraulic fracturing, and relates to a three-dimensional fracture network fracturing optimization method for a thick glutenite horizontal well. Background technique [0002] In the development process of low-permeability glutenite reservoirs, due to low permeability and small porosity, effective seepage channels are often not formed. Coupled with the water sensitivity of mineral components in the rock formation, clay minerals swell and block the pore bellows after encountering water. As a result, the output of oil and gas wells is rapidly reduced, which cannot meet the basic requirements of economic development. In response to this problem, horizontal well multi-stage staged fracturing is currently one of the most effective stimulation measures at home and abroad. Through artificial fractures, multi-stage fracturing is performed along the horizontal section to form seepage channels and fractu...

AI Technical Summary

Problems solved by technology

However, when the glutenite is thicker, in the development process, no matter extending the length of the horizontal section to increase the number of fracturing stages, or increasing the fracturing scale to extend the length of propped fractures, the reserves of the oil and gas reservoir cannot be effectively controlled. The reserves are low and the sweeping range is small, the limit seepage radius of a single well is far from sweeping the upper and lower boundaries of the oil and gas reservoir, the degree of reserves production is low, and it is difficult to realize the effective production of vertical thickness

In this case, the horizontal well layout optimization scheme adopted is firstly that the horizontal wells are mostly dispersed in multiple platforms, which occupy a large area, require high land acquisition costs, and the distance between platforms is far away, making it difficult to concentrate drilling and pressurization. Second, different horizontal wells communicate with each other during fracturing construction, and the fracture network formed does not conform to the original optimal design, which reduces the stimulation effect

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