低油价下致密油资源经济效益评价研究

Evaluation of the tight oil resources economic benefit under the low oil price

美国致密油采用"水平井+体积压裂+工厂化"模式实现了工业化开采,我国致密油开发总体上仍处于准备阶段。在致密油开发的核心技术中,水平井加体积压裂是提升致密油产量的利器。这意味着相比常规石油,致密油的单井投资更为高昂。在低油价下,油气田开发企业的生产经营陷入困境。在成本制约下,致密油开发的经济效益评价至关重要,而压裂水平井水平段的优化设计尤为关键。由致密油压裂水平井全生命周期产能预测模型计算出单井产油量,利用折现现金流量法评价水平井钻井压裂过程中水平段长度和压裂级数对经济效益的影响,得出存在相对最佳的水平段长度和压裂级数范围使得单井经济效益达到最优。实际制订水平井开发方案时,应考虑单井产量、投资、成本和效益的综合影响,制订最优开发方案。

Applying volumetric fracturing of horizontal wells in factory-like mode,the US tight oil resources realized industrial development.Tight oil development in China is still in preparation stage as a whole.In the core technology of tight oil development,volumetric fracturing in horizontal wells is to be powerful tool to increase production which means more expensive single well investment compared with conventional oil.The production and operation of oil and gas field development enterprises are in trouble under the low oil prices.Economic evaluation of tight oil development is particularly critical under cost constraints while optimal design of the horizontal section of fractured horizontal wells is especially crucial.Single well production is yielded from the full life circle productivity prediction model of fractured horizontal well in tight oil reservoirs.Utilizing discounted cash flow method to evaluate how horizontal length and the number of fractures effect economic benefit of tight oil.There is a relatively optimal value of the horizontal length and the number of fractures range to achieve the most excellent economic benefit of single well.The preparation of horizontal development program should consider the factors of output,investment,cost and benefit of single well and optimal development plan should be prepared.