关停井综合治理潜力分析及界限研究
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摘要
在油田开发的过程中,必然由于诸多原因形成大量的关停井。关停井不仅造成大量资产的闲置,而且使油田注采情况变差,储量动用不均衡,直接影响油田生产和采收率的提高。但随着油田开发时间的延长,油田开发已进入高含水后期,由于注采关系的调整,油价的变化,部分关停油井已具备再利用的潜力,因此有必要对部分有潜力的关停油井重新再利用,因此对于关停油井潜力分析和治理界限的研究有其重要性。
对关停油井准确的判断出其潜力所在,将目前具有开发潜力的关停油井充分的再利用起来,更好地提高油田开发的经济效益。本文对杏北油田57口已治理的关停油井进行深入调查及研究,分析了杏北油田关停油井的地质状况及注采情况,总结出了关停油井成因。应用盈亏平衡原理及油藏工程原理建立了经济潜力预测模型,可以计算出油井的关井经济界限,从而准确判断关停油井是否具有再利用的经济潜力;考虑影响开发潜力的因素,建立了关停油井开发潜力预测模型,从而计算出关停油井的继续开发潜力指数,实现对关停油井再利用开发潜力的评价;运用模糊数学评判方法建立了压裂措施选井选层评价模型,对治理的措施井进行选井选层;应用盈亏平衡原理建立了措施效果经济潜力预测模型,从而评价该措施是否可行。
本文应用以上建立评价预测模型,优选出杏北油田典型区块具有再利用潜力的井层。结合关停油井剩余地质储量及注采状况的研究,对可再利用关停油井进行潜力预测评价。对已治理的14口实施压裂措施的关停油井进行潜力预测,其潜力符合率达85.6%,对杏北油田所选10口关停潜力井进行压裂措施后再生产,其治理潜力界限为5t,均具有较好的经济效益。
During the process of development in oil-fields, it has unavoidably caused to plenty of shut down wells for various reasons. Shut down Wells have caused serious problems, such as: many assets is standing idle; the injection and production rate is becoming imbalance; disproportion the drawing up on reserves, est., which has a bad direct effect on the production and recovery of the Oilfield. However, with the development of the Oilfield at Extra High Water Cut Stage, the adjustment of injection-production relation and the alternation of oil price, some of shut down oil wells has reusable potential now, therefore it is necessary and important to find out the value and the regulation limit of them.
In order to judge the potential for shut down oil wells, find out such oil wells bearing reused potential, and improve the economic returns, it is meaningful to study on the reusable potential for shut down oil wells. In the paper, the geologic situation, the injection-production relation and the causes of closing oil wells has been summed up and analyzed through in-depth study on the information of 57 shut down and have been regulated oil wells of Xingbei Oilfield. The prediction model of economic potential is based on the theory of economics profit and loss balance principle and reservoir engineering principle, this model can determine the closing economic limitations of oil wells and predict whether a closed-in oil well has reusable economic potential or not. Reusable potential prediction model is established in order to reuse the potential of shut down oil wells by considering development potential, and this model can realized the evaluation of the reusable potential for shut down oil wells by calculating the redeveloping potential index. The evaluation model of selecting wells and formations for fracturing is based on Fuzzy Mathematics theory, using this method for choosing the well and layer for fracturing. The prediction model of economic potential for the effectiveness of measure is based on the theory of economics profit and loss balance principle, this model can determine the measure of fracturing is feasible or not.
Applying the above prediction models, the paper select out the wells and formations bearing reusable potential of typical block in Xingbei Oilfield. Predicting and evaluating the reusable potential of shut down oil wells based on the results of studying on the remaining reserves and the injection-production relation. Predicting the reusable potential of 14 shut down oil wells which have been implemented measure of fracturing, the results shows the potential to meet the rate of 85.6%, fracturing programs of 10 shut down oil wells which regulation limit was 5t have operated in Xingbei Oilfield, and they had good economic benefits.
对关停油井准确的判断出其潜力所在,将目前具有开发潜力的关停油井充分的再利用起来,更好地提高油田开发的经济效益。本文对杏北油田57口已治理的关停油井进行深入调查及研究,分析了杏北油田关停油井的地质状况及注采情况,总结出了关停油井成因。应用盈亏平衡原理及油藏工程原理建立了经济潜力预测模型,可以计算出油井的关井经济界限,从而准确判断关停油井是否具有再利用的经济潜力;考虑影响开发潜力的因素,建立了关停油井开发潜力预测模型,从而计算出关停油井的继续开发潜力指数,实现对关停油井再利用开发潜力的评价;运用模糊数学评判方法建立了压裂措施选井选层评价模型,对治理的措施井进行选井选层;应用盈亏平衡原理建立了措施效果经济潜力预测模型,从而评价该措施是否可行。
本文应用以上建立评价预测模型,优选出杏北油田典型区块具有再利用潜力的井层。结合关停油井剩余地质储量及注采状况的研究,对可再利用关停油井进行潜力预测评价。对已治理的14口实施压裂措施的关停油井进行潜力预测,其潜力符合率达85.6%,对杏北油田所选10口关停潜力井进行压裂措施后再生产,其治理潜力界限为5t,均具有较好的经济效益。
During the process of development in oil-fields, it has unavoidably caused to plenty of shut down wells for various reasons. Shut down Wells have caused serious problems, such as: many assets is standing idle; the injection and production rate is becoming imbalance; disproportion the drawing up on reserves, est., which has a bad direct effect on the production and recovery of the Oilfield. However, with the development of the Oilfield at Extra High Water Cut Stage, the adjustment of injection-production relation and the alternation of oil price, some of shut down oil wells has reusable potential now, therefore it is necessary and important to find out the value and the regulation limit of them.
In order to judge the potential for shut down oil wells, find out such oil wells bearing reused potential, and improve the economic returns, it is meaningful to study on the reusable potential for shut down oil wells. In the paper, the geologic situation, the injection-production relation and the causes of closing oil wells has been summed up and analyzed through in-depth study on the information of 57 shut down and have been regulated oil wells of Xingbei Oilfield. The prediction model of economic potential is based on the theory of economics profit and loss balance principle and reservoir engineering principle, this model can determine the closing economic limitations of oil wells and predict whether a closed-in oil well has reusable economic potential or not. Reusable potential prediction model is established in order to reuse the potential of shut down oil wells by considering development potential, and this model can realized the evaluation of the reusable potential for shut down oil wells by calculating the redeveloping potential index. The evaluation model of selecting wells and formations for fracturing is based on Fuzzy Mathematics theory, using this method for choosing the well and layer for fracturing. The prediction model of economic potential for the effectiveness of measure is based on the theory of economics profit and loss balance principle, this model can determine the measure of fracturing is feasible or not.
Applying the above prediction models, the paper select out the wells and formations bearing reusable potential of typical block in Xingbei Oilfield. Predicting and evaluating the reusable potential of shut down oil wells based on the results of studying on the remaining reserves and the injection-production relation. Predicting the reusable potential of 14 shut down oil wells which have been implemented measure of fracturing, the results shows the potential to meet the rate of 85.6%, fracturing programs of 10 shut down oil wells which regulation limit was 5t have operated in Xingbei Oilfield, and they had good economic benefits.
引文
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