B6 Reservoir Development Effect Evaluation And Countermeasures Research

Many old oilfields in our country have entered the development period phase of high water cut one after another, there will usually exist many increasingly problems including high water cut, high degression, waterflood effect becomes poor, imperfect of injection-production system, esp. In order to make these oilfields to develop efficiently and continually, it is necessary to carry out effect assessment, then design scientific adjustment.In the study of the effect of water flood field, mostly taken a development site period, using water cut and recovery degree relations, production decline rule, formation pressure maintain level, the rationality of injection-production patterns nets, finally water drive process such indicators do some qualitative evaluation. With the production and the change of scheme, oilfield development effect also is in produce change, so combining the geological condition and the process of production to have a comprehensive evaluation is necessary.B6 reservoir has developed over 30 years, oilfield has reached 73.56% comprehensive moisture content and entered the development period phase of high water cut, the increasing oil measures have worse effect. The composite decline rates reached 5.65% at present, development level is defined as catepory, belongs to the "medium" type. Oilfield development is facing with high water cut, high degressive adverse situation. Based on the real reservoir B6, synthesize waterflooding characteristic curve, production decline curve, reservoir numerical simulation method and some production dynamic index to give it a comprehensive evaluation, forecast reservoir future trends. And integrating with reservoir recovery empirical formulation of flooding sandstone oilfield, the potential of recoverable reserve is forecasted. Meanwhile, the reservoir numerical model established, based on good reserves fitting and historical fitting, giving the quantitative description of remaining oil distribution.Combining the studying achievements in B6 reservoir, based on the current plan, from well-net array, formation pressure keep level and injection-production ratio these three aspects restructured reservoir plan. Under the new scheme, the oil reservoir development indexes getting a large improvement, giving good guidance for the actual production of B6 reservoir.