Application of temporary plugging and balanced fracturing technology in the reservoir stimulation of Linxing deep coalbed

Abstract:

In the Linxing Block， multiple coalbed series with strong heterogeneity are vertically developped in directional wells. Conventional fracturing technology fails to achieve uniform reservoir stimulation， leading to over-expansion of high-permeability intervals and insufficient stimulation of low-permeability intervals， which seriously affects development efficiency. By reasonably optimizing the fracturing design parameters of Well LX36-XXD in the block， soluble knot-type temporary plugging balls were used to realize temporary plugging fracturing. After temporary plugging， the construction pressure increased significantly， verifying the rationality of the fracturing scheme design. The fracture morphology simulation showed that after adding temporary plugging agents， both No.8 and No.9 coal seams were effectively stimulated， with obvious temporary plugging balanced fracturing effects. The effective stimulated reservoir volume （SRV） increased by 18.2%， and the initial production reached 0.8×10?m3/d. This verifies the adaptability of temporary plugging balanced fracturing to reservoirs with strong heterogeneity， demonstrating significant technical advantages. It provides an important technical reference for the efficient development of deep coalbed methane， and its promotion value in tight-cut fracturing of horizontal wells can be further explored in the future.