缝网压裂井增能吞吐三维岩心物理模拟实验研究

发布时间：2018-05-12 01:05

本文选题：扶余油层 + 储层物性　；参考：《东北石油大学》2017年硕士论文

【摘要】：葡南油田扶余油层属于低孔特低渗储层,前期开发过程采用了缝网压裂技术,进行压裂开发。随生产时间的延长,地层能量消耗较大,无法得到有效补充,产量递减较快,采出程度较低,这严重制约和影响到油田开发效果和经济效益。为此,必须寻求进一步挖掘油层剩余潜力和提高原油采收率技术措施。考虑到扶余油层岩石孔隙较小,存在较强的毛管力和储层渗透率较低,无法有效补充地层能量,具有渗吸采油提高原油采收率和吞吐的潜力。针对矿场实际需求,本文以自生CO2增能吞吐技术和优化渗吸液性能提高渗吸采收率为目标,以油田化学、油层物理和胶体表面化学为理论指导,以化学分析、仪器检测和物理模拟为技术手段,以葡南油田扶余油层为研究平台,从储层岩石物性与流体性质研究、增能剂体系性能评价、渗吸液体系筛选及性能评价、人造岩心制作工艺、裂缝岩石渗吸效果及其影响因素研究、缝网压裂仿真模型裂缝参数对增能渗吸效果及其影响因素研究等方面着手,开展了缝网压裂井增能吞吐三维岩心物模实验。结果表明,随油藏压力升高,CY表面活性剂渗吸采收率增加。随注入速度增大,渗吸采收率呈现出“先增加后减小”变化趋势。随渗吸液注入段塞尺寸增加,渗吸采收率增加,但增幅减小。随憋压时间延长,渗吸采收率增加,但增幅逐渐减小;随交替注入次数增加,渗吸采收率增加,但增幅逐渐减小。随仿真模型主缝长度和分支缝条数增加,渗吸采收率增加,但增幅逐渐减小。随“增能剂+渗吸液”组合实施时油井含水率增大,采收率增幅逐渐下降。随“增能剂+渗吸液”组合的注入量和焖井时间逐渐增大,采收率增幅呈逐渐上升趋势,但幅度逐渐减小。随“增能剂+渗吸液”组合的注入速度和段塞尺寸增加,采收率增幅呈先升后降趋势。
[Abstract]:Fuyu reservoir in Punan Oilfield belongs to low porosity and low permeability reservoir. With the prolongation of production time, the formation energy consumption is large, which can not be effectively replenished, the production decreases rapidly and the recovery degree is low, which seriously restricts and affects the development effect and economic benefit of oil field. Therefore, it is necessary to further explore the remaining potential of the reservoir and improve the oil recovery technical measures. Considering that the rock porosity of Fuyu reservoir is small, the reservoir permeability and capillary force are low, and the formation energy can not be effectively replenished, it has the potential of oil permeability and oil recovery to improve oil recovery and huff and puff. In order to meet the actual demand of mine field, this paper aims at the technology of in-situ CO2 energy stimulation and puff, and optimizes the performance of permeation and liquid absorption to improve the permeability and recovery, and takes the theory of oil field chemistry, reservoir physics and colloid surface chemistry as the theoretical guidance, and takes chemical analysis as the basis. Based on the research platform of Fuyu reservoir in Punan Oilfield, the instrument test and physical simulation are used to study the physical and fluid properties of reservoir rock, the performance evaluation of energy enhancer system, the screening and performance evaluation of permeating and absorbing system, and the artificial core making process. Based on the study of permeability absorption effect of fractured rock and its influencing factors, and the research of fracture parameters of fracture mesh fracturing simulation model on the energy increasing permeability effect and its influencing factors, the three-dimensional core model experiment of energy increasing, huff and puff in fracture mesh fracturing well is carried out. The results show that the permeability and oil recovery of CY surfactant increase with the increase of reservoir pressure. With the increase of injection rate, the permeability recovery shows a trend of "increase first and then decrease". With the increase of slug size, the permeability recovery factor increases, but the increase decreases. With the increase of pressure holding time, the permeability recovery increased, but the increase gradually decreased, and with the increase of alternate injection times, the permeation recovery increased, but the increase gradually decreased. With the increase of the length of the main seam and the number of branch cracks in the simulation model, the absorption recovery factor increases, but the increase decreases gradually. The oil well water cut increases and the oil recovery increases gradually with the combination of "energy enhancer permeating and absorbing liquid". With the increase of injection rate and braised well time of the combination of "energy enhancer permeation and absorption", the increase of recovery factor is gradually increasing, but the amplitude is gradually decreasing. With the increase of injection rate and slug size of the combination of "energy enhancer osmosis and absorbent", the oil recovery increased first and then decreased.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE311;TE357

【参考文献】