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- Title
考虑非达西效应的边水气藏水平井见水时间预测模型.
- Authors
石军太; 张龙龙; 羊新州; 洪舒娜; 李星浩; 李文斌; 鲁家国
- Abstract
The production of horizontal wells in edge-water gas reservoirs declines after water breakthrough. Accurately predicting the time of water breakthrough is conducive to choosing reasonable development and production allocation methods, and improving the recovery rate of edge-water gas reservoirs. Considering factors such as water invasion rate, reservoir dip angle, and non-Darcy effect of gas phase, a prediction model for water breakthrough time of horizontal wells in edge water gas reservoirs is established; The water exposure time of the factors is compared, and the sensitivity analysis of the influencing factors is carried out. The results show that: in the process of water invasion, the speed of water quality point moving to the bottom of the well is the superposition of water invasion speed and tongue advance speed, and there is a critical boundary that can divide the water quality point migration process into pure water invasion stage and water invasion superimposed tongue. The calculation results of the prediction model are basically consistent with the actual water breakthrough time, and the relative error is -5.9%, which verifies the reliability of the model; the factors that have a positive impact on the water breakthrough time are the effective thickness of the reservoir, the dip angle of the reservoir, and the length of the horizontal well. and the initial distance between the horizontal well and the gas-water boundary, the negative impact factors are the water invasion rate and gas well production, and the gas phase non-Darcy effect has little impact; the main factors affecting the water breakthrough time of horizontal wells are gas wells in order from strong to weak Production, water invasion rate, initial distance between horizontal well and gas-water boundary, effective reservoir thickness, reservoir dip and horizontal well length. The results provide a basis for rational production allocation and enhanced oil recovery of horizontal wells in edge-water gas reservoirs.
- Subjects
GAS reservoirs; WATER quality; THERMAL oil recovery; NATURAL gas geology; GAS fields
- Publication
Journal of Northeast Petroleum University, 2022, Vol 46, Issue 1, p104
- ISSN
2095-4107
- Publication type
Article
- DOI
10.3969/j.issn.2095-4107.2022.01.009