Adaptability Evaluation Of Water Injection Process And Matching Technology Research In Haian Oilfield

The most of the domestic oil field is given priority to water flooding development at present,and most of them are non-homogeneous multi-layer oil field,the interlayer and between layer and layer reservoir permeability are quite different,if layers water flooding of general pattern be implemented,it will be exposed between the layer and the plane and three major contradictions. Within the implementation of separate layer water injection is a kind of measure to solve the contradictory between interlayer and plane.Haian oilfield is mainly composed of Lijiazhuang block and Yuanjiazhuang block and red double block and Zhujiazhuang block and Jijiazhuang block and Xuejiazhuang block,the Haian oilfield second concave depressions rambling concave and QUTANG in composition. The Haian oilfield field porosity distribution in the range of15.2%to25.4%, average20.9%; permeability range between0.19～214×10-3μm2average of33.8×10-structure and physical property parameter in acidic volcanic reservoir. The the the ground crude average density0.8941t/m3; ground oil viscosity (50℃) an average of49.9mPa.s formation oil viscosity5.86mPa.s; average sulfur content of0.42%; freezing point average of42℃. Fu Ⅲ formation water NaHCO3(Yuan1-15wells), the salinity34945.32mg/L. Combination of the above stratigraphy and fluid properties shows that Haian oilfield oilfield is a the hypotonic hypercoagulable high salinity reservoirs. Haian oilfield consists of Dainan group and the Sanduo group and Fu three group, mainly mining layer of Fu three upper and lower, therefore it is very necessary to implement tiered water injection development.However, with the ongoing water injection, water injection pressure rising, Haian oilfield applications the conventional eccentric dispensing process packer only valid for128days, resulting in a shorter string is valid; Furthermore conventional eccentric dispensing process and pulling deployment of low efficiency of the test error, can not meet the small displacement dispensing accuracy requirements of the Haian oilfield. Haian oilfield illite/smectite layer, illite, kaolinite, chlorite contents were higher, which is a major factor in the sensitivity injury, due to the injection of water ion concentration and water velocity and other reasons, caused the formation damage to affect the permeability of the formation. Coupled with the characteristics of the oilfield hypotonic high pour point oil, with the increase in the amount of injection, injection forefront of the oil-water transition zone will generate flow resistance-Jamin effect, at room temperature, water injection interested in formation caused by "cold" Damage, wax, bitumen quality precipitation, clogging water injection channel. In response to these problems, so the dispensing process and supporting technology research is urgently needed to carry out Haian oilfield.First of all, Haian oilfield geology and separate injection technology have been analyzed and evaluated, analyzed due to the cause of the short injection and the separate injection technology limitations.Through survey of Daqing, Shengli, Dagang, Jiangsu oilfields separate injection technology and matched technology, preferably several separate injection technology can be used to Haian oilfield, through study of the working principle of these technology, the applicable conditions and cost, combined characteristics of Haian oilfield oilfield strata and water injection actual situation, systematic study of the separate injection technology and the matched testing and deployment of technology, formed on the basis of a bridge type eccentric separate injection technology, and developed into a bridge eccentric integrated subdivision injection technology, the deep well anchored (MCHR kava packer and bridge eccentric water distributor) separate injection technology, inclined concentric dual injection technology, and so on, a variety of well conditions Haian oilfield separate injection technology. Through a large number of laboratory experiments, the study identified the HRAC retarded acid, FAC-1multi-hydrogen acid as the the Haian oilfield main acid formulations, formed a the Haian oilfield series acidizing technology; liquid retarded acid site formed a low damage integrated processing technology, has achieved remarkable results. Understanding on water wells fracturing mechanism of augmented injection,for Haian oilfield characteristics of low permeability strata, preferably clean fracturing fluid fracturing wells as Haian oilfield preferred liquid, the fracturing fluid rheology, harmful, conductivity, suspended sand ability to aid compatibility, broken plastic, fluid loss and surface tension performance tests, and fracturing parameters were optimized.