致密油藏经济有效开发主要指标界限

Main index limits for the economic and effective development of tight oil reservoirs

基于致密油藏开发实践,分析已实施缝网压裂直井和体积压裂水平井2种致密油开发方式下产量变化规律,优化部分经济评价参数,形成了一套适合致密油藏经济参数优选和评价的方法。利用该方法对2种致密油开发方式下不同油价、不同单井日产量的致密油典型区块进行了经济效益评价,依据评价结果建立了在内部收益率为6%、不同油价下单井投资界限与日产量界限图版。应用该图版可有效减少经济评价工作量,快速确定产能区块是否达到经济效益指标。同时通过对投资界限的敏感性分析,明确了油价敏感区间以及单井日产量和投资界限对评价结果的敏感程度。研究成果对致密油探明储量提交、开发方案编制以及油田规划部署等工作中具有很强的指导作用,可以降低产能投资决策风险,保证了致密油产能项目顺利实施。

Based on the development practice of tight oil reservoirs,the production change laws of both fracture⁃network fractured vertical well and volume fractured horizontal well were analyzed,the partial economic evaluating parameters were optimized,and a set of optimizing and evaluating methods for the economic parameters of tight oil reservoirs were established.With the help of this set of methods,the economic benefits were evaluated for the typi⁃cal tight oil blocks with different oil prices and daily productions per well under above the two tight⁃oil developing modes.According to the evaluated results,the chart boards were established for the investment and daily production limits of single well at 6%internal rate of return and different oil prices.By means of the charts,the workload of e⁃conomic evaluation can be effectively reduced,and it can quickly determine whether the productivity block reaches the economic benefit index.At the same time,through the sensitivity analysis of investment limit,the oil price sen⁃sitive interval,and the sensitivity of the single⁃well daily production and investment limit to the evaluated results were clarified respectively.The study achievements have strong guiding roles in the submission of proved reserves of tight oil,preparation of the developing plans and oilfield planning⁃deployment,thus the risk of productivity investment can be reduced and the implementation of tight⁃oil productivity projects can be ensured smoothly.