Application of wide field electromagnetic method fracturing monitoring technology in tight sandstone gas reservoir:A case study of Jinqiu Gas Field in central Sichuan
The wide area electromagnetic method fracturing monitoring technology obtains the electromagnetic time difference anomaly by monitoring the electromagnetic response caused by the electrical change after the fracturing fluid is injected into the formation,reflects the sweep range of the fracturing fluid,and then analyzes the characteristics of the fracture network.This paper introduces the basic principle and monitoring method of wide area electromagnetic method fracturing monitoring.Taking JinqiuGas Field in central Sichuan as an example,in order to find out the effect of fracturing transformation,wide area electromagnetic method fracturing monitoring is carried out to solve the problem that the fracture morphology and propagation law are difficult to describe accurately.The monitoring results show that:l)The total length of fracturing fractures on both sides of the Jinqiu gas field is more than 300 m,and theaffected area is large.The overall transformation effect is good,but there is a strong heterogeneity between the clusters.2)During the fracturing of tight sandstone,several main fractures are generated,and then they continue to expand and extend along the direction of the main fracture.Finally,the fracturing fractures show a number of peak-like protrusions,and the larger the porosity and brittleness index,the easier the fracture propagation and the larger the sweep length.3)The fracture characteristics are related to the construction parameters such as cluster hole,segment length,cluster spacing,liquid strength and sand strength.The reasonable cluster spacing of Jinqiu gas field is 9～10 m,the reasonable segment length is 80～100 m,the reasonable liquid strength is 16.5 m3/m,and the reasonable sand strength is 5.0～6.0 t/m,which guides the optimization and adjustment of the later fracturing construction technology.
wide field electromagnetic methodfracturing monitoringsweep rangereal-time guidanceprocess optimization
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