Fixed-point multi-stage fracturing method for improving longitudinal transformation degree of dense thick layer

Abstract

The invention discloses a fixed-point multi-stage fracturing method for improving the longitudinal transformation degree of a dense thick layer. According to the development condition of a reservoir interlayer, temporary plugging fracturing is adopted to realize fixed-point multi-stage fracturing for longitudinal full use of the dense thick layer, and in combination with a fracturing construction curve and dipole acoustic wave tests before and after fracturing, transformation of the dense thick layer and independent cracking and extension of each section of crack are realized. Compared with a conventional volume fracturing technology, the transformation cost can be effectively reduced, and the method has important significance for efficient development of the dense thick layer and is expected to be developed into a main body transformation technology of an ultra-low-permeability III-type dense thick layer.

Description

technical field [0001] The invention relates to the technical field of fracturing reconstruction of oil and gas wells, in particular to a fixed-point multi-stage fracturing method for increasing the degree of longitudinal stimulation of dense thick layers. Background technique [0002] With the continuous deepening of the development of Changqing Oilfield, the proportion of ultra-low permeability Type III tight thick layers has increased. The oil layers of this type of reservoirs are relatively thick, but their physical properties are poor and vertical production is difficult. In the early stage, mature multi-stage sand fracturing was adopted The output of stimulation, oil testing, and production is low; at present, the main body adopts the idea of ​​"concentrated perforation + large-scale fracturing", but fracture simulation and monitoring show that the reservoir has not been fully developed vertically, and the stimulation effect needs to be improved. At the same time, large...

AI Technical Summary

Problems solved by technology

[0002] With the continuous deepening of the development of Changqing Oilfield, the proportion of ultra-low permeability Type III tight thick layers has increased. The oil layers of this type of reservoirs are relatively thick, but their physical properties are poor and vertical production is difficult. In the early stage, mature multi-stage sand fracturing was adopted The output of stimulation, oil testing, and production is low; at present, the main body adopts the idea of ​​"concentrated perforation + large-scale fracturing", but fracture simulation and monitoring show that the reservoir has not been fully developed vertically, and the stimulation effect needs to be improved. At the same time, large-scale stimulation Leading to a substantial increase in renovation costs, there is greater pressure to improve efficiency and reduce costs

Images