| 唐巨鹏,余泓浩,张昕,崔翰博.油页岩原位注热开采储层有效热解区变化规律分析[J].计算力学学报,2023,40(3):440~446 |
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| 油页岩原位注热开采储层有效热解区变化规律分析 |
| Analysis on variation of effective pyrolysis zones in reservoir by in-situ heat injection production of oil shale |
| 投稿时间：2021-10-30 修订日期：2021-12-14 |
| DOI：10.7511/jslx20211030001 |
| 中文关键词: 油页岩 原位开采 对流加热 温度 压力 应力 |
| 英文关键词:oil shale in-situ mining convective heating temperature pressure stress |
| 基金项目:国家自然科学基金面上项目（51874165）；辽宁省兴辽英才计划项目（XLYC1902106）资助. |
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| 中文摘要: |
| 针对油页岩原位注热开采过程中储层有效热解区变化规律不清，实际热解效果无法准确判断难题，采用数值模拟方法，以抚顺油页岩储层为研究对象，建立了油页岩原位注热开采热流固耦合力学模型，与前人结果对比，验证了模型可靠性。重点考察水力压裂裂缝通道短路问题，分析得到了油页岩原位注热开采过程中储层有效热解区、储层有效热解区中地应力、注汽压力及沉降量随注热时间变化规律。结果表明，过热蒸汽沿水力压裂裂缝流动不会出现裂缝通道短路现象，过热蒸汽可通过水力压裂裂缝加速油页岩储层热解；采用过热蒸汽对流加热油页岩储层效率高，只需1年能使96%的油页岩储层达到热解所需温度；油页岩储层有效热解区中部形成应力集中区，最大地应力为21.6 MPa；热解后靠近注热井处岩层发生沉降，热解2年后最大沉降量达0.85 m。所得结论对现场油页岩原位注热开采有参考意义。 |
| 英文摘要: |
| Aiming at dealing with the unclear change law of the effective pyrolysis zone of the reservoir during the in-situ heat injection production of oil shale, and the difficulties in assessing the actual pyrolysis effect, a numerical simulation method is used to study the Fushun oil shale reservoir, and the oil shale in-situ is established.The thermal-fluid-solid coupling mechanics model of heat injection production is compared with previous results to verify the reliability of the model.The analysis has obtained the effective pyrolysis area of the reservoir and the in-situ stress, steam injection pressure and subsidence in the effective pyrolysis area of the oil shale during the in-situ heat injection production process with the heat injection time.The result shows:The superheated steam flowing along the hydraulic fracturing fractures will not cause short circuit of the fracture channels, and the superheated steam can accelerate the pyrolysis of the oil shale reservoir through the hydraulic fracturing fractures.Using superheated steam convection to heat oil shale reservoirs is highly efficient.It only takes 1 year to make 96% of the oil shale reservoirs reach the required temperature for pyrolysis.During the pyrolysis process, a stress concentration zone is formed in the middle of the effective pyrolysis zone of the oil shale reservoir, and the maximum in-situ stress is 21.6 MPa.After pyrolysis, the rock formation near the heat injection well has subsided, and the maximum subsidence reached 0.85 m after 2 years of pyrolysis.The conclusions obtained provide guidance for in-situ heat injection production of oil shale on site. |
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