An Unsteady Productivity Prediction Method of Multi-fractured
Horizontal Well in Tight Volcanic Rock Reservoir

doi:10.11885/j.issn.1674-5086.2013.11.26.04

Abstract

Abstract:

The technology of multi-fractured horizontal well is the one of the most effective methods to develop tight volcanic rock reservoir. Through the research on the unsteady productivity prediction model of multi-fractured horizontal well in tight volcanic rock reservoirs，the productivity characteristics of multi-fractured horizontal well can be effectively predicted and the contributions of many factors to productivity can be confirmed，both of which can guide the development of gas reservoir. The porous flow from tight volcanic rock formation to multi-fractured horizontal well can be divided into three stages. In consideration of the characteristics and mechanism of porous flow in different regions and at different stages，three coupled jingxingequations，the equations of porous flow from matrix to fracture，from fracture near wellbore region and from new wellbore region to wellbore，are created. Meanwhile，based on elliptic seepage theory and superposition principle in conditions of multi-well interference，through the theories of conformal transformation and equivalent wellbore diameter，an unsteady productivity prediction model of multi-fractured horizontal well in tight volcanic rock reservoir is constructed. This new model is utilized in gas field and sensitivity analysis of many coefficients is conducted. The calculation results suggest that the primary productivity of multi-fractured horizontal well in tight volcanic rock formation is high，and gas productivity declines gradually as time goes by. The characteristics of productivity are high productivity and high decline rate at preliminary stage，and low productivity，low decline rate and nearly constant productivity at late stage. All influencing factors，threshold pressure gradient， compaction coefficient and slippage factor，are found to have an optimal value spectrum through sensitivity analysis.

Key words: tight volcanic rock reservoir, multi-fractured horizontal well, unsteady state, productivity prediction

Wang Qiang1，2, Tong Min1, Wu Zhanguo3, Wei Yi1. An Unsteady Productivity Prediction Method of Multi-fractured Horizontal Well in Tight Volcanic Rock Reservoir[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2013.11.26.04.

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An Unsteady Productivity Prediction Method of Multi-fractured Horizontal Well in Tight Volcanic Rock Reservoir

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