Open Access

ARTICLE

Experimental Evaluation of Water Control Agents in Low permeability Reservoir with Fractures

Zhao Fenglan^1,2,3, Hou Jirui^1,2,3, Cao Shujun^1,2,3

1 Research Institute of Enhanced Oil Recovery, China university of petroleum Beijing 102249.
2 Key laboratory of Enhanced Oil Recovery, CNPC Beijing 102249.
3 Key Laboratory of petroleum Engineering, Ministry of Education, Beijing, 102249.

Structural Longevity 2013, 9(3), 143-151. https://doi.org/10.3970/sl.2013.009.143

Abstract

Several water control agents, including pre-linked gel particles, emulsion microspheres, continuous chromium gel with different viscosity and underground starch graft copolymer gel were evaluated in lab. The properties such as gelation time and gel strength of gel, and expansion of particles and microspheres were tested at high temperature. Also, the injection pressure, plugging strength and resistance factor were measured using the artificial low permeability cores with fractures.
It was shown that, for the particle type water control (pre-linked gel particles and emulsion microspheres), the particle size and distribution are crucial characters for the plugging property. The particle size should be must be adaptable with the fracture width, not be too big or small, which is very difficult to control. Also, for the continuous chromium with different viscosity, the added polymer concentration higher, the viscosity is higher, with higher plugging strength. Meantime, high polymer concentration will lead to poor injectivity (high viscosity on ground) and high cost. Therefore the plugging and strength should be coordinated. The starch graft copolymer can be generated underground, which on ground is thin solution. So it is easy to be injected into formation and has good plugging property. The results show that the underground starch gel is more suitable to be used for water control in low permeability formation.

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Keywords

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