Composite temporary plugging steering repeated fracturing method suitable for shale gas long horizontal well

Abstract

The invention discloses a composite temporary plugging steering repeated fracturing method suitable for a shale gas long horizontal well, and the method comprises the following steps: performing squeezing construction, and supplementing energy to a pressure failure area of an old well; performing multi-stage steering main fracturing, and dredging old fractures; plugging a hole of a primary fracturing part through a temporary plugging ball, and then performing sand fracturing construction through fracturing fluid, and reconstructing a primary fracturing under-transformation area; enabling the fracturing fluid to carry an in-fracture diverting agent, so as to promote the steering of the fracture, and improve the fracture complexity; after the diverting agent in the fracture reaches the stratum, continuing the sand fracturing construction, and further reconstructing the primary fracturing insufficient and unmodified areas. According to the invention, a tubular column does not need to be tripped in or dragged, the field construction operability is high, the construction period is greatly shortened, the cost is low, the utilization rate of the horizontal section of the shale gas horizontal well can be increased, the shale gas well is recovered or the productivity is increased, low-cost repeated fracturing transformation of the shale gas long horizontal well is met, and the economicbenefits of a shale gas field are increased.

Description

technical field [0001] The invention relates to the technical field of exploration and development of oil and gas fields, in particular to a method suitable for compound temporary plugging and diversion to repeated fracturing of shale gas long horizontal wells. Background technique [0002] In terms of refracturing, the existing technologies are mainly applied to conventional oil and gas wells, rarely applied to unconventional oil and gas fields, and have not been applied to long horizontal shale gas wells. Compared with long horizontal wells, vertical wells have shorter well intervals and need to run pipe strings. The process is complicated, the treatment period is long, and there are problems such as limited displacement, difficult extraction of pipe strings, and complicated procedures. construction requirements. [0003] Application number CN104213894B, titled "Selective Refracturing Technology for Old Oilfield Wells", proposes a selective refracturing technology for old...

AI Technical Summary

Problems solved by technology

[0006] (2) After the initial fracturing of long horizontal wells in shale gas, the cleanliness of the wellbore is low, and mechanical methods will lead to problems such as limited displacement, difficult extraction of pipe strings, and complicated procedures.

[0009] (1) This technology is mainly used in low-permeability gas wells, but not in shale gas wells;

[0010] (2) This technology is mainly used in low-permeability vertical well fracturing construction, and the number of construction sections is small, so it is difficult to meet the construction requirements of long horizontal sections