Bedrock yield contribution rate calculation method considering multi-scale cracks
A calculation method and technology of contribution rate, applied in calculation, computer-aided design, design optimization/simulation, etc., can solve problems such as uncertain contribution rate of fractures at all levels, rapid decline in gas well production, etc.
Pending Publication Date: 2021-06-15
中海石油(中国)有限公司海南分公司
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[0002] There are multi-level fractures in fractured gas reservoirs, so all levels of fractures contribute to the productivity of gas wells. In the actual production process, only the total gas production of each level can be checked, and the actual fracture distribution and scale cannot be checked. information to determine the contribution rate of cracks at all levels
For fractured gas reservoirs, the early gas volume mainly comes from large-scale fractures, but the gas volume in large-scale fractures will be produced quickly, resulting in a rapid decline in gas well production
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Embodiment 1
[0047] Taking an actual bedrock gas well as an example, a method for calculating the contribution rate of bedrock production considering multi-scale fractures includes the following steps:
[0048] S1: Use CT scanning to directly obtain real digital cores, or use information such as fracture density, fracture length, fracture opening, and porosity in bedrock samples to establish randomly distributed equivalent digital cores. In this embodiment, the equivalent digital rock core under the core scale is established based on the crack information obtained by statistics (the crack opening is 0.05 mm, the average crack length is 31.4 mm, the crack density is 0.5 / cm, and the crack dip angle is 60°), and the following is obtained: figure 1 Fractures shown are randomly distributed digital cores.
[0049] S2: Based on the digital core, perform flow simulation, and obtain the porosity φ at the core scale according to the following sub-steps m , equivalent permeability k mand the shape ...
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The invention discloses a bedrock yield contribution rate calculation method considering multi-scale cracks. The bedrock yield contribution rate calculation method comprises the following steps: collecting crack information of a rock core scale, establishing a digital rock core under the rock core scale, performing flow simulation based on the digital rock core, and obtaining porosity, equivalent permeability and shape factors under the rock core scale; collecting crack information of a logging scale, establishing a bed rock block model under the logging scale, supplementing a source item of which the fluid channeling rate is qm to a matrix, and obtaining porosity, equivalent permeability and a shape factor under the logging scale based on the bed rock block model; and acquiring crack information of gas well scales, establishing a gas well control range model, supplementing a source item with the fluid channeling quantity of qn for a matrix, and calculating the yield Q of a gas well through finite element flow simulation, so as to calculate the gas production contribution rate of the crack under each scale. According to the method, the gas production contribution rate of the fractures under all levels of scales can be obtained, and a theoretical basis is provided for guiding development of fractured gas reservoirs.
Description
technical field [0001] The invention relates to the technical field of oil and gas development, in particular to a calculation method for bedrock production contribution rate considering multi-scale fractures. Background technique [0002] There are multi-level fractures in fractured gas reservoirs, so all levels of fractures contribute to the productivity of gas wells. In the actual production process, only the total gas production of each level can be checked, and the actual fracture distribution and scale cannot be checked. The information determines the contribution rate of cracks at all levels. For fractured gas reservoirs, the early gas volume mainly comes from large-scale fractures, but the gas volume in large-scale fractures will be produced quickly, resulting in a rapid decline in gas well production. Therefore, finding a method that can quantitatively evaluate the contribution rate of fractures at all levels to the production of gas wells can effectively analyze t...
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IPC IPC(8): G06Q50/02G06F30/28G06F113/08G06F119/14
CPCG06Q50/02G06F30/28G06F2113/08G06F2119/14
Inventor 裴健翔郭书生吴木旺梁豪廖高龙姜洪丰
Owner 中海石油(中国)有限公司海南分公司
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