低渗油藏裂缝封堵剂用量计算

Calculation of fracture plugging agent quantity in low permeability reservoir

王硕亮 张媛 董烈 陈文斌

中国地质大学（北京）能源学院，北京 100083 中国石油大庆油田有限责任公司勘探开发研究院，黑龙江 大庆 163712 中国石油长庆油田公司超低渗透油藏研究中心，陕西 西安 710018

School of Energy Resources, China University of Geosciences, Beijing 100083, China Research Institute of Exploration and Development, Daqing Oilfield Company Limited, PetroChina, Daqing 163712, China Research Center of Ultra-Low Permeability Reservoir, Changqing Oilfield Company, PetroChina, Xi′an 710018, China

低渗油藏压裂投产时形成的人工裂缝与天然裂缝共存，造成角井水淹严重而边井注水不见效，为增大水驱波及系数，调剖堵水是经常采用的增产手段。然而目前该类油藏的调剖堵水效果较差，成功率较低。综合分析发现，影响调剖堵水效果的关键问题是传统调堵方案设计中未考虑堵剂由裂缝向基质的滤失，方案设计的堵剂用量偏小。文中在渗流理论的基础上，建立了裂缝系统与基质系统的渗流方程，考虑不同储层物性和堵剂性能条件下的堵剂滤失，推导出不同条件下的堵剂总量与滤失量的比例，可用于指导具体调剖堵水方案设计，得到最佳堵剂用量。通过现场实施效果验证，该方法可较大幅度地改善调堵技术效果。

Coexistence of artificial fracture and natural fracture created during fracturing in low permeability reservoir results in the serious flooding of angle well and the poor effect on side wells water injection. In order to increase the sweep efficiency of water flooding, profile control and water plugging is a measure that is frequently used. However, the current effect of profile control and water plugging is poor and the success rate is low. Study finds out that the deciding factor of affecting the effect of profile control and water plugging is the problem of plugging agent filtration from fracture towards matrix in traditional profile control and water plugging program design. The plugging agent quantity is always small. Flow equations of fracture system and matrix system are established and the analytical solution of plugging agent filtration considered different reservoir properties and different plugging agent properties is derived through the using of classic filtration theory in this paper. Proportion of total quantity of plugging agent and filtration rate is obtained at different conditions, which can guide the design of profile control and water plugging program and can calculate the best plugging agent quantity. Through the actual implementation of the effect, the proposed method can greatly improve increase the effect of water plugging.

10.6056/dkyqt201303026