A CO suitable for tight oil and gas reservoirs 2 Foam Fracturing Methods

Abstract

The invention provides a CO2 foam fracturing method suitable for a compact oil and gas reservoir. The CO2 foam fracturing method comprises the following steps that (1), according to reservoir parameters and the block well pattern well spacing, input parameters are selected accurately, then the production capacity variation situation under different crack lengths and different flow guiding capacityparameters is predicted, the optimal crack length and crack flow guiding are obtained, and thus fracturing construction scale is optimized; (2), according to the technological demand and after-pressing flowback and production demands, a fracturing construction pipe column is determined, by combining with the situation of constructed adjacent wells, construction pressure prediction is conducted, thus the construction displacement is optimized, then related construction parameters are optimized, and single-well optimization design is completed; and (3), a CO2 clean foam fracturing liquid systemis injected into a shaft, and then CO2 foam fracturing construction is conducted. According to the CO2 foam fracturing method, a single well of the 'three-low' compact oil and gas reservoir can be effectively improved, the volume is effectively transformed, stratum energy is increased, quick self-spraying flowback is achieved, the using amount of fracturing liquid is reduced, damage of the liquidto a stratum is reduced, and the single-well productivity is improved.

Description

technical field [0001] The invention relates to a CO suitable for tight oil and gas reservoirs 2 A foam fracturing method belongs to the technical field of oil exploitation. Background technique [0002] Reservoir fracturing, as a key technology for developing tight reservoirs at home and abroad, has been widely used, and conventional fracturing technology has made great breakthroughs. However, the fracturing method is relatively simple, and has not been comprehensively considered from the perspective of geology-reservoir-hydraulic coupling. At the same time, the conventional guar gum fracturing fluid has great damage to the formation, and after cross-linking, it is alkaline and cannot interact with CO. 2 use simultaneously. [0003] Therefore, there is an urgent need in the art to provide a CO suitable for tight oil and gas reservoirs. 2 Foam fracturing method. SUMMARY OF THE INVENTION [0004] In order to solve the above shortcomings and deficiencies, the purpose of...

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Problems solved by technology

[0002] Reservoir fracturing, as a key technology for the development of tight reservoirs at home and abroad, has been widely used, and conventional fracturing technology has made great breakthroughs, but conventional fracturing has low flowback rate, large damage to formation by liquid, and The fracturing method is relatively single, and it has not been considered comprehensively from the perspective of geology-reservoir-hydraulic coupling

At the same time, conventional guar gum fracturing fluids do great damage to formations, and are alkaline after cross-linking, so they cannot interact with CO 2 use simultaneously

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