Study On Acidification Technology Of Sandstone In BZ25-1 Oilfield

Acidification has been widely used in the offshore oil field, BZ25-1offshore oilfield in China is currently the larger oil fields have been developed, the success of its main reservoir acidification River Street is the key to its cost reduction and efficiency.From the BZ25-1oilfield geological reservoir data to start, through literature research, pick soil acid, boric acid fluoride, hydrogen-acid three kinds of liquid system as the research object, By indoor laboratory physical simulation, select the most suitable acid systems BZ25-1oilfield, Mathematical model of the actual acidizing acid radial flow along the borehole in the "two-three mineral acid" acidification based on the model and its discrete and calculated as follows:(1) demonstrates the feasibility BZ25-1of acidizing. Through research abroad sandstone acidizing technology advances and more commonly used in several domestic acidification means to analyze reservoir properties and deposition of Shahe Street BZ25-1oilfield reservoir, confirmed acidizing can be carried out in BZ25-1field.(2) To study the acidification BZ25-1oil reservoir characterization and adaptation. Min experimentally derived by five potential harm BZ25-1Oilfield mainly for strong water sensitivity, a certain velocity sensitivity and acid sensitivity, reservoir loose structure, acidification could easily lead to fines migration of clay, sand. Deep shall plugging acidification.(3) indoor physical simulation laboratory, screening for BZ25-1oilfield acid system. Pick unearthed acid, boric acid fluoride, hydrogen-acid three kinds of liquid system as the research object, and evaluate a variety of acidification is preferred additives.(4) Establish a "two three mineral acid" acidification model and numerical solution. Experimental results show that the core acidification preferred acid system borofluoric system and more hydrogen acid system, but considering the actual needs of the mine, still build sandstone soil sour model. Mathematical model of the actual acidizing acid radial flow along the borehole in the "two-three mineral acid," based on the theory and its discrete and calculations.(5) explain the simulation results are given for the process parameters BZ25-1oilfield acidification.A more complete Shahejie reservoir acidizing process and related simulation and design methods presented in this paper, can guide the design and field applications, the use of the model can be calculated for the oilfield acidification process parameters. The actual construction parameters should also be further adjusted according to the site.