Stepped displacement fracturing pump casting method based on combined type perforation

Abstract

The invention discloses a stepped displacement fracturing pump casting method based on combined type perforation. The stepped displacement fracturing pump casting method comprises the steps that (1) after perforation, quick water fracturing liquid is subjected to pump casting in a stepped displacement mode; (2) guar gum fracturing liquid containing a supporting agent is subjected to pump casting;(3) clear water is subjected to pump casting for replacement; (4) the supporting agent ratio is increased, and guar gum fracturing liquid containing the supporting agent is subjected to pump casting;(5) then clear water is subjected to pump casting again, and thus sand-containing liquid and the clear water are alternatively subjected to pump casting till the ratio of the supporting agent reaches20%; and (6) finally, a large amount of clear water is subjected to pump casting till the supporting agent conducts complete replacement in cracks. According to the stepped displacement fracturing pump casting method based on combined type perforation, combined-type-structural-perforation-containing shafts are further included, the situation that complex crack networks are formed in unconventionaloil-gas reservoirs with the large burial depths is facilitated, the scale of the hydraulic cracks is effectively increased, and thus the purpose that the permeability is artificially increased is achieved.

Description

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AI Technical Summary

Benefits of technology

The present in this new technology improves the efficiency at which fluids are injected into underground formations by reducing pressure drop caused when fluid flows through small cracks or fault zones around them. This results in more efficient production from these areas compared to traditional methods like drilling multiple bore holes that require expensive equipment.

Problems solved by technology

This patents describes various techniques aimed towards creation of new ways of breaking up rocks underground without causing damage from exploitation processes like drilling operations. These techniques include perpendicular orientation multiple piercing tools called periscopes (PCH) which can provide better control over fracturcings during excavation campaigns. Additionally, certain proposals exist about how these techniques could enhance the fissile petroleum resource prospects while addressing challenges associated with traditional mineral oil and tight strata gas resersqueezing schemes.

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