Xinjiang Oilfield Handling Heavy Flooding In A Block-level Quantitative Evaluation Criteria Established

Evaluation of waterflooding on heavy oil exploited by steam stimulation is a worldwide poser. Conventional reservoir has had a evaluation criterion, but so far the waterflooding level criterion of heavy oil hasn’t been formed. Depended on heavy oil reservoir in shallow layer of H well field in Xinjiang field, this article has deeply studied factors influence on waterflooding of heavy oil exploited by steam stimulation, waterflooding mechanism and the response of petrophysics, the measure of logging qualitative identification of waterflooding layer,the quantitative evaluation parameter of waterflooding, finally, the quantitative waterflooding level criterion has been formed.Be aimed at the geologic characteristic of lithology complication and anisotropy intensity of heavy oil reservoir in shallow layer of H well field in Xinjiang field. Conbinated the steam absorbed intensity data with dynamic data, Factors on the waterflooding,such as the steam overlapping, physical property difference, bed thickness and steam injection quantity are studied. Based on the experiment research of rock matrix dissolution change in different temperature zone under the condition of high temperature, the law of change containing porosity and permeability in oil layer and waterflooding layer which are lied in wide spacing, medium spacing, and close spacing. Utilizing the logging data and dynamic production data, the logging response between weak waterflooding¬ waterflooding and medium waterflooding&strong waterflooding are identified. Porosity model is formed in different rock type. Based on the mercury intrusion data, reservoirs are divided in four types according to the flow unit theory, permeability model and bound water saturation model in different type of reservoir are formed. Because fluidity of heavy oil is weak and steam huff and puff is circle, displacement efficiency is the best approach for being divided the waterflooding level. Based on the dynamic data and well test data, clue of forming the waterflooding level criterion is proposed, displacement efficiency boundary of the oil layer, weak waterflooding layer, medium waterflooding layer, strong waterflooding layer is determinate. Conception of this article offers a new method for the evaluation of heavy oil waterflooding.