Technology Research In Deep Heavy Oil Exploitation By Nature Gas Buff-Puff

As the oil and gas exploration and development further in depth, the proportion of the reserve hard to develop increases. The steam injection pressure is difficult to realized and the heat loss is far more when exploit the deep heavy oil .So thermal recovery methods doesn't adapt to these reservoirs. Development by injecting nature gas is possible because it is free of contamination and recoverable. The systematical study in recovery mechanism and technique of deep heavy oil exploration by gas buffing and puffing is vital meaningful.At present, only few technique studies in injecting nature gas buffing and puffing concentrate in the laboratory experiments. Regarding the numerical simulation researches of deep heavy oil reservoir it is barren. Taking LuKeQin oilfield as an example this paper researches influencing factors and rules and parameters optimization design by the numerical simulation technology. These integrated the PVT experiments and swelling experiment indicated that it has obvious viscosity reducing effect when injecting nature gas; the oil volume with gas injection can be 1.056 times of the oil without gas injection. By the experiments data regression, the EOS parameters were obtained, which will be used in numerical simulation; there studied the reservoir basic geological parameters as reservoir depth, permeability, temperature and injection–production parameters as cyclic gas injection, injection rate, shut-in time and other like these. Then it designed the parameters according to the block. Based on seven periods index forecast, it indicated that the recovery percent by injecting nature gas raised 3.42% compared to depletion. So, injecting nature gas is an effective method for heavy oil exploration. Finally, the block production potential was also very considerable, and the first three layers will be potent objects to exploration。...