页岩气水平井产量影响因素分析

发布时间：2018-11-29 10:54

【摘要】：中国是全球第3个商业化开发页岩气的国家,到2030年页岩气规划产量为800×10~8~1 000×10~8 m~3,展现出良好的发展前景。长宁—威远和昭通国家级页岩气示范区页岩气开发效果显示,目前该区页岩气水平井平均测试产量达到19×10~4 m~3/d,但测试产量却高低参差不齐。为此,从地质和工程两个方面分析了上述示范区页岩气水平井产量影响因素,提出了不同区块水平井提高单井产量的技术方向;根据含气量差异将优质页岩段进一步细分为4类储层,评价水平井Ⅰ类储层钻遇率;依据天然裂缝发育程度、主应力非均质性、脆性指数等工程参数来评价储层改造条件;建立压裂加液量、加砂量、施工排量和返排率与测试产量之间的相关关系;评价压裂形成裂缝复杂程度。研究结果表明:①长宁区块Ⅰ类储层钻遇率高于威远和昭通区块,且当水平井Ⅰ类储层钻遇率大于50%,可保障气井测试页岩气产量高于15×10~4 m~3/d、预计单井最终可采储量(EUR)高于8 000×10~4 m~3;②昭通区块储层改造条件和压裂形成的裂缝复杂程度均优于长宁和威远区块,但加砂量和施工排量等压裂施工参数偏低,制约了前者水平井的测试产量。结论认为,昭通和威远区块进一步提高Ⅰ类储层钻遇率、昭通区块进一步优化压裂施工参数是提高上述示范区页岩气水平井单井产量的主要技术方向。
[Abstract]:China is the third country in the world to commercialize the development of shale gas. The planned output of shale gas by 2030 is 800 脳 10 ~ (8) ~ 8 脳 10 ~ (8) m ~ (-3), which shows a good prospect of development. The results of shale gas development in Changning-Weiyuan and Zhaotong National Shale Gas demonstration areas show that the average tested output of shale gas horizontal wells in this area is 19 脳 10 ~ 4 mm ~ 3 / d, but the test output is not uniform. Therefore, the factors affecting the production of shale gas horizontal wells in the demonstration area are analyzed from the geological and engineering aspects, and the technical direction of improving the single well production of horizontal wells in different blocks is put forward. According to the difference of gas content, the high quality shale segment is further subdivided into 4 types of reservoirs, and the drilling rate of horizontal well type I reservoir is evaluated, and the conditions of reservoir reconstruction are evaluated according to the engineering parameters such as the degree of development of natural fractures, the heterogeneity of principal stress and brittleness index, etc. The correlation between fracturing fluid addition, sand loading, production discharge rate and test production is established, and the complexity of fracturing formation is evaluated. The results show that: 1 the drilling rate of type I reservoir in Changning block is higher than that of Weiyuan and Zhaotong blocks, and when the drilling rate of horizontal well type I reservoir is greater than 50, the shale gas production of gas well testing can be guaranteed to be more than 15 脳 10 ~ (4) mm ~ (3) / d. The final recoverable reserves (EUR) of single well is estimated to be more than 8 000 脳 10 ~ (4) m ~ (3); (2) the reservoir reconstruction conditions and fracture complexity of Zhaotong block are better than those of Changning and Weiyuan blocks, but the fracturing operation parameters such as sand addition and operation displacement are low, which restricts the testing production of the former horizontal well. It is concluded that further improvement of drilling rate of type I reservoirs in Zhaotong and Weiyuan blocks and further optimization of fracturing operation parameters in Zhaotong block are the main technical directions for increasing single well production of shale gas horizontal wells in these demonstration areas.
【作者单位】：中国石油勘探开发研究院;
【基金】：国家科技重大专项“大型油气田及煤层气开发”(编号:2016ZX05062) 中国石油天然气股份有限公司科学研究与技术开发项目“页岩气钻采工程现场试验”(编号:2014F-4701-03)
【分类号】：TE37

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