Method for evaluating reserves at late steam huff and puff under SEC criterion

Abstract

The present invention provides a method for evaluating reserves at late steam huff and puff under the SEC criterion. The method comprises: obtaining historical production data of a target block, and plotting a relation diagram between the stage yield and the time; according to the plotted relation diagram between the cumulative oil yield and the cumulative gasoline ratio, obtaining a linear regression equation of the cumulative gasoline ratio and the cumulative oil yield; collecting economic parameters of the target block, and obtaining the economic limit gasoline ratio and the economic limit yield of the target block; and according to the linear regression equation of the cumulative gasoline ratio and the cumulative oil yield, and the economic limit gasoline ratio and the economic limit yield, obtaining a decline rate of the target block, according to the decline rate of the target block, using the index decline method to evaluate the reserve of the target block, and finishing evaluation on the reserves at late steam huff and puff under the SEC criterion. According to the method for evaluating reserves at late steam huff and puff under the SEC criterion, the obtained results are more practical.

Description

technical field [0001] The invention relates to an evaluation method, in particular to a reserve evaluation method in the later stage of steam stimulation under the SEC criterion, and belongs to the technical field of petroleum exploitation. Background technique [0002] SEC (The United States Securities and Exchange Commission) is the abbreviation of the United States Securities and Exchange Commission. It is the management agency of oil companies listed in the United States. It has formulated the guidelines for the evaluation of oil and gas reserves (SEC guidelines). Oil companies listed in the United States must conduct reserve assessments in accordance with SEC guidelines. [0003] According to the SEC guidelines, dynamic methods are used for reserve evaluation of developed thermally recovered heavy oil reservoirs, mainly including decline curve analysis method and reservoir numerical simulation method. [0004] The decline curve analysis method is a commonly used metho...

AI Technical Summary

Problems solved by technology

To use this technology accurately, the oil production rate and time must have an obvious decreasing trend. However, for the reservoirs in the late stage of steam huff and puff, due to the adoption of combined group steam injection, interwell or interlayer replacement, and development mode conversion, multi-stage production is formed. Jumping decline or relatively stable and rising phenomenon, the value of the decline rate generally refers to the decline rate of the previous stable mining period of the evaluation block, and the decline rate during this period cannot well reflect the development law of the evaluation block in the later stage of throughput development. The decline curve analysis method has great limitations in reserve evaluation

[0005] Reservoir numerical simulation method is based on oilfield history matching and using existing operating technology to predict. There is a certain degree of uncertainty in the production dynamics of the target block simulated by the reservoir numerical simulation method, and the evaluation time is long

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