Experimental Evaluation of Water Control Agents in Low Permeability Reservoirs with Fractures
Several water control agents, including preformed particle gel, emulsion microspheres, continuous chromium gel and underground starch graft copolymer gel, were evaluated in the lab.Properties such as the gelation time and strength of the gel, as well as the expansion of particles and microspheres, were tested at a high temperature.Also, the injection pressure, plugging strength and resistance factor were measured using artificial low permeability cores with fractures.The results showed that, for particle-type water control agents, the particle size and distribution are crucial factors affecting plugging.The particle size should adapt to the fracture width.Also, for continuous chromium gel, when the concentration of added polymer was higher, so were the viscosity and plugging strength.However, a high polymer concentration will lead to poor injectivity and high cost.Therefore, a balance must be found between plugging and strength.The starch graft copolymer can be generated underground, is easy to inject into formations, and exhibits good plugging properties.The results showed that the underground starch graft gel is more suitable for water control in low permeability formations with fractures.
preformed particle gel emulsion microspheres chromium gel starch graft fractures
Fenglan Zhao Shujun Cao Jirui Hou
Research Institute of Enhanced Oil Recovery, China University of Petroleum, Beijing 102249, P.R.China;Key laboratory of Enhanced Oil Recovery, CNPC, Beijing 102249,P.R.China;Key Laboratory of Petroleum Engineering, Ministry of Education, Beijing, 102249, P.R.China
国内会议
青岛
英文
125-129
2013-06-26（万方平台首次上网日期，不代表论文的发表时间）