The Shunan Jialingjiang Group Reservoir Reconstruction And Applied Research

Being the attributes of low permeability and low porosity, the carbonate reservoir of fracture-pore type in Jialingjiang Formation in south Sichuan is often difficult to produce commercial value output if there is no acid-treatment in reservoir for increasing production. The key to successful acidizing treatment is the compatibleness of acid technicology with reservoir attributes. The mineral composition of reservoir rock in different geologic structures, different wells or strata is often variable. And the reaction abilities of minerals in reservoir rock with acidizing fluids have big difference. Making use of experiment and simulation methods, in this paper, a series of investigates on compatibility of acidizing treatment with reservoir in Jialingjiang Formation have been carried out. After being studied in depth, important outcomes and conclusions are drawn as follows.Reservoir rock in Jialingjiang Formation has higher elasticity modulus. It means that the solidness of rock is big. It is very difficult to create wide fracture using hydraulic fracture within such kind of reservoir rock because higher elasticity modulus of reservoir will limit the width of fracture and then result in huge resistance.The methods of injecting gelling acid by single-stage and injecting micelle acid by single-stage with low delivery rate are not visibly effective for improve the flow conductivity of acid etching fracture. No matter gelling acid or micelle acid, it is very effective to inject alternately acid and active water by multi-stage combined routine closed acid fracturing for improve the flow conductivity of acid etching fractures.The notable outcome is that appropriate acid fluid system and technology have been optimized for different reservoir in Jialingjiang Formation. Such as anti-mud acid and micelle acid system for reservoir with high content of mud, anhydrox acid system for reservoir with high content of gyps, and that anti-mud acid and anhydrox acid system for reservoir with high contents both mud and gyps. For T1j21- T1j1 reservoirs in Tongfuchang structure, the way of routine acid fracturing combined closed acidizing has obvious treating effective. For T1j2 3 reservoirs in Maliuchang structure, the alternate injection of micelle acid and active water combined routine closed acid fracturing is a quite valid treatment for increasing production. For T1j41 - T1j33 reservoirs in Yibing buried structure, the alternate injection of gelling acid and active water combined routine closed acid fracturing is a most compatible way for reservoir treatment.