A multi-round CO2 huff and puff evaluation method for heavy oil reservoirs with edge and bottom water
An edge-bottom water reservoir and evaluation method technology, which is applied in the field of multiple rounds of CO2 huff and puff evaluation in heavy oil edge-bottom water reservoirs, can solve problems such as difficult weight assignment, unreasonable evaluation results, and difficult calculation of evaluation matrices
Active Publication Date: 2019-08-23
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology
[0004] Aiming at problems such as difficult assignment of weights, difficult calculation of evaluation matrix, and unreasonable evaluation results caused by incomplete field data, the purpose of the present invention is to provide a multi-round CO 2 The throughput evaluation method can propose a reasonable evaluation boundary, so as to solve these unreasonable problems
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[0093] This embodiment provides a heavy oil side bottom water reservoir with multiple rounds of CO 2 For the evaluation method of throughput, multiple rounds of CO2 in heavy oil reservoirs with edge and bottom water were carried out on 37 horizontal wells with relatively complete dynamic and static data. 2 Throughput evaluation, including the following steps:
[0094] Step 1: Measure the actual parameters of various factors in the actual reservoir, and based on this, establish a reservoir model to simulate the oil production of throughput recovery and non-thump recovery, and obtain the increased oil production of throughput; the oil production obtained by simulation of throughput recovery - Proposed oil production from production without puffing = increased oil production through puffing.
[0095] Step 2, taking the increase in oil throughput as the evaluation correlation object, using the formula (I) to calculate the correction weight A of each factor i :
[0096]
[00...
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The invention provides an assessment method of multicycle carbon dioxide huff-puff for thickened oil edge-bottom water reservoir. The assessment method has the steps that actual parameter of each factor in real reservoir is measured as gist, reservoir model is established, huff-puff mine oil production and non-huff-puff mine oil production are simulated and obtained, huff-puff oil increment is obtained; huff-puff oil increment is used as evaluating association object, amendment weight of each factor is calculated and computing method of membership is established, evaluation matrix of modeling scheme and real scheme is obtained, amendment weight of each factor is reunited, average value of synthesis score of all factor with each modeling scheme and real scheme and Cj are calculated and sorted. The assessment method can solve the problem of difficult evaluation of weight brought from incomplete in-situ data, difficult calculation of evaluation matrix, short gist of evaluation limit and unreasonable evaluation result, and has significance for directing and conducting reasonable evaluation of multicycle carbon dioxide huff-puff for thickened oil edge-bottom water reservoir.
Description
technical field [0001] The invention belongs to heavy oil CO 2 In the technical field of huff and puff effect evaluation, it relates to a multi-round CO 2 Throughput evaluation method. Background technique [0002] heavy oil CO 2 Huff and puff technology is a production adjustment measure to enhance the ultimate recovery of crude oil in heavy oil reservoirs. Due to its short implementation time, quick results, water control, no damage to formations, and no pollution, it has become an ordinary heavy oil It is an effective method to solve the problem of rapid rise of water cut in the development process of reservoirs, especially heavy oil reservoirs with edge and bottom water. Therefore, CO 2 The throughput effect evaluation method becomes the primary problem to be solved by this technology. [0003] Among the conventional effect evaluation methods, the fuzzy comprehensive evaluation method is most commonly used. This is because the geological conditions and development m...
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IPC IPC(8): G06F17/50G06Q10/06G06Q50/02E21B43/16
CPCE21B43/164G06F30/20G06Q10/0639G06Q50/02
Inventor 刘同敬刘睿第五鹏祥周建成杰江礼武王佳杜山山廖书宇
Owner CHINA UNIV OF PETROLEUM (BEIJING)