Abstract
Abstract Based on the theoretical study and field application of volume stimulation in horizontal wells over the past 10 years, the core connotation of volume stimulation was further interpreted. The implementation methods, design models and key issues were analyzed, and the future development direction was put forward. The research shows that the multi-cluster limited entry technique can achieve homogenous growth of multiple fractures. The hybrid stimulation of “breaking by rock gel stimulation + carrying proppant by slick water” plus small-particle proppant can reduce the fracture complexity near the well bore and increase stimulated reservoir volume (SRV) in the far-field. The requirement of fracture conductivity in unconventional formations can be met by shear-sustained fractures and proppant-transporting slick water. The optimum well spacing between a child well and a parent well should be determined by the stimulation modes, injection volume and pressure drawdown. Reconstructing seepage field, stress field and stimulation targets is crucial for improving the stimulation results in a horizontal well. Reducing cluster spacing and well spacing is the basis for establishing development modes of fracture-controlled reserves. Fracturing-design decision system based on “spatial-mode stimulation” and geology-engineering integration is an important research direction for volume stimulation techniques.
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