多元热流体多轮次吞吐周期注入强度优化方法

Optimization method for injection intensity of multi thermal fluid huff and puff in multiple cycles

多元热流体吞吐热采作为一种海上稠油热采开发技术,已在渤海稠油油田开发中进行了多轮次吞吐试验。通过理论分析和数值模拟方法,合理表征了多元热流体吞吐技术机理,引入变异系数概念,得出影响多轮次吞吐效果的主要因素为注入强度、转周时机、注入温度、周期递增率。基于典型油田的油藏特征,以周期产出投入比为评价指标,形成不同累产油和存气率条件的计算样本,回归得到多元热流体吞吐井多周期最佳注入强度,用影响热采效果的主要因素对优化进行校正,绘制成优化图版,准确高效地得到合理注入参数,提高多轮次吞吐热采效果。

As one of the offshore heavy oil thermal exploitation technology, the multi thermal fluid stimulation technology had been carried out in the development of heavy oil in Bohai oilfield. By the theoretical analysis and numerical simulation method, we reason-ably characterized the mechanism of multi thermal fluid huff and puff, introduced the concept of coefficient of variation, and ob-tained the main factors affecting the effect of multiple rounds of throughput, which were the injection strength, shift opportunity, in-jection temperature, and periodic increasing rate. Based on the reservoir characteristics of the typical oil field, and with the evalua-tion index of the rate of cycle output and input, we got the sample data of different cumulative oil production and gas retention condi-tions, and regressed the optimum injection strength in multiple cycles of multi thermal fluid huff and puff wells. Then we corrected the optimization by using the main factors influencing the thermal recovery effect, drew the optimized version to obtain the reason-able injection parameters accurately and efficiently, and improved the thermal recovery effect of huff and puff in multiple rounds.