论文部分内容阅读
为避免层间连通,许多位于水层或压力衰竭层上方几米处的潜在产层均未实施压裂处理或不再深入探查。这使产量无法优化,且往往损失一部分可采储量。现场已成功地试验了几项控制地层裂缝高度生长的技术。所用压裂液为低粘(20~50cP)水基或油基压裂液。一般做法是控制不同时段的排量和支撑剂浓度,并在前置液中使用缝高控制材料。试验一律填充约5t支撑剂,追踪到的总缝高生长小于15m。压后测试表明,在渗透率小到0.1md的地层内裂缝长度达90m。实施现场压裂前使用数值模型进行压裂模拟有助于设计出最优的压裂方案。现已成功地实施了10次处理,没有发现有压裂缝高大于计算机模拟缝高的情况。
To avoid interlayer connectivity, many of the potential pay zones that lie a few meters above the water or pressure depleted layers are not fractured or go deep into exploration. This does not optimize production and often loses some of the recoverable reserves. Several techniques have been successfully tested for controlling the height growth of formation fractures. The fracturing fluid used is low viscosity (20 ~ 50cP) water-based or oil-based fracturing fluid. The common practice is to control the displacement and proppant concentration over time and to use seam height control material in the pre-fluid. The test will be filled with about 5t proppant, the total height of the tracked growth less than 15m. Post-press tests show that the fracture length in formations with permeability as small as 0.1 md can reach 90 m. The use of a numerical model for fracturing simulation prior to site fracturing can help to design the optimum fracturing scheme. It has been successfully implemented 10 times, did not find any cracks higher than the computer simulation of seam height.