Karamay Six, Nine Districts Of Shallow Heavy Oil Thermal Chemical Recovery Technology Research,

The six and nine section shallow layer heavy oil reservoir of Kelamayi Oil Field lie in the west-north edge of Zhungeer Basin, 40km away from the north-east of Kelamayi City. The oil field lie on top wall override fringe of the Ke-Wu Rupture, belong to rupture screening type monocline pool, pool incline to east-west, angle of inclination is from 4°to 9°, the structure is simple. Distribution of oil layer is controlled by structure and lithology, the west boundary of the oil layer is controlled by west Xibaibai Rupture, the other is controlled by lithology, the primary oil rock is middle-pack sandstone, glutenite and pebbled sandstone, have no active flank water and bottom water. The distribution of oil layer in the oil reservoir is stable, the average deposition thickness is 100m, effective thickness of oil layer is 5 -30m, oil layer coefficient is 0.57.The six and nine section shallow layer heavy oil reservoir mostly dispersed over Qigu Group of upper Jurassic . Qigu Group strata deposition thickness is 60-200m, average thickness is 100m, belong to fluvial facies which is composed of pray-taupe pack sandstone nip mudstone. Particle size of deposition change greatly, bad sorting. From above to below divide into G1, G2, G3 three sand group, oil layer mostly focus on G2 oil layer, G2 oil layer reservoir have good conditions , average porosity is 30%, middle buial depth is 150-500m, permeability is 0. l-10Mm2. Effective thickness of oil layer is 5-30m, average oil saturation is 64%, original oil layer temperature is 17-19. 2℃. The plane difference ofoil viscosities is large, on the ground when 20 ℃ viscosity of gas-free crude oil is from2000 to 2000000mPa. s.In view of the property of the heavy oil reserve and the property of the crude oil, as well as the available oil production technologies, combining the property of thermo- chemical oil recovery technique, a large number of experi- ments have been carried out. Inaccordance with the property of the sixth and ninth region and the property of the crude oil and the available chemical emulsification agent, speci- fic performance evaluation indices have been presented. Base on the indoors experiments, the typical optimized reservoir feature, construct physical model, both the physical and numerical model of difference throughput means and different gas-driving mode have been carried out. Taken the simulating result and the practical production of the sixth and ninth region into account, the thermochemical oil recovery techni- que has been optimized. By the end of 2002, altogether 303 wells has been implemented with the emulsification agent throughput. The efficiency is 65%, and the average increased oil of single well cycle is 124t, and the gas-oil ratio has been increased by 0.1; the field has carried out the chemical emulsification agent slug driving into execution with 4 wells, and the efficiency is 100%, the gas oil ratio of the producing wells has reach 0. 03 as well. The total crude oil has increased to 39, 427t after the wells had been treated by the both thermochemical oil recovery technique, and the production value has achieved Y304, 376, 000, the input-output ratio is 1:4. 86 as a result. In a word, the thermochemical oil recovery technique is simple and low-cost and the construction is convenient. It is suitable to be carried out cosmically in the field.