Shale gas horizontal well bridge plug separation and ball throwing segmented fracturing process

Abstract

The invention discloses a shale gas horizontal well bridge plug separation and ball throwing segmented fracturing process, which concretely comprises the following steps of: 1, draining, exploring and washing a well tube; 2, performing clustering perforation on a first segment; 3, performing fracturing construction on a first cluster; 4, throwing balls for sealing the first cluster; 5, repeatedly performing the fracturing construction, ball throwing and sealing steps in the third step and the fourth step on a second cluster, a third cluster to an N-th cluster; 6, sealing the first segment by a lower bridge plug, and performing clustering perforation on a second segment; 7, sequentially and repeatedly performing fracturing construction, ball throwing, sealing and lower bridge plug sealing steps in the third, fourth, fifth and sixth steps on the second segment to the N-th segment; and 8, performing sweeping grinding. The process method has the advantages that the design is reasonable; the construction cost is low; the optimum flowing passage of shale gas can be realized by adopting the process method; high economic return is obtained at high speed and high yield; and the fractures can be limited to the most economic positions.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field exploitation, and in particular relates to shale gas development technology, in particular to a shale gas horizontal well bridge plug separation and ball-throwing segmental fracturing process. Background technique [0002] In my country, shale gas reserves are very rich, according to statistics, the reserves reach 30*10 12 m 3 , great development potential. Shale gas reservoirs must be fractured to form economically valuable oil and gas reservoirs. The development of horizontal wells and horizontal well staged fracturing technology has become the main development technology at present. In the prior art, one is to use bridge plugs to separate multi-cluster perforation fracturing technology. The disadvantage of this technology is that it is difficult to ensure that each cluster is depressed after clustering, the effect on reservoir stimulation is limited, and it is difficult to achie...

AI Technical Summary

Problems solved by technology

In the prior art, one is to use bridge plugs to separate multi-cluster perforation fracturing technology. The disadvantage of this technology is that it is difficult to ensure that each cluster is depressed after clustering, the effect on reservoir stimulation is limited, and it is difficult to achieve high production after fracturing. the goal of

The second is to only use the ball-pitching staged fracturing process, which also has the following disadvantages: 1. This process requires all the reservoirs to be shot at one time, and it is impossible to confirm the construction well section, let alone optimize the design; 2. If sand plugging occurs, use After blasting, sand washing, etc., the plugged reservoir balls will fall into the wellbore, making it impossible to carry out the next staged fracturing construction

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