考虑变启动压力和压敏效应的蒸汽吞吐产能计算新方法  

A New Method for Steam Stimulation Productivity Calculation by Considering Variable Starting Pressure and Pressure-Sensitivity

作　　者：张宇 李承龙[3] Zhang Yu;Li Chenglong(Daqing Normal University,Daqing,Heilongjiang 163712,China;Northeast Petroleum University,Daqing,Heilongjiang 163000,China;PetroChina Daqing Oilfield Company,Ltd,Daqing,Heilongjiang 163712,China)

机构地区：[1]大庆师范学院,黑龙江大庆163712 [2]东北石油大学,黑龙江大庆163000 [3]中国石油大庆油田有限责任公司,黑龙江大庆163712

出　　处：《特种油气藏》2020年第1期89-95,共7页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项“外围油田改善开发效果及提高采收率技术研究与应用”（2016E-0209）、“低渗、特低渗复杂油藏规模有效动用关键技术”（2017ZX05013-006）

摘　　要：低渗透稠油油藏受压敏效应影响,启动压力、渗透率及孔隙度发生变化,严重影响产量。目前已有吞吐产能预测模型未考虑压敏效应的影响,计算结果与实际情况偏差较大,适用性较差。针对上述问题,基于低渗透稠油油藏流体渗流理论,结合平面径向流压力分布规律及地层温度分布规律,应用压敏效应公式,推导了考虑变启动压力和压敏效应的低渗透稠油油藏蒸汽吞吐直井和水平井产能预测模型,并将研究成果应用于胜利油田A区块。结果表明:试验区3口水平井实际累计产油量为4695 t,模型计算累计产油量为4893 t,误差为4.22%;12口直井实际累计产油量为3868 t,模型计算累计产油量为4080 t,误差为5.46%,模型精度较高。研究成果可用于评价低渗透稠油油藏产能,为油藏有效开发提供理论基础。The pressure-sensitivity of low-permeability reservoir leads to variable starting pressure,permeability and porosity,which seriously influence the production of low-permeability heavy-oil reservoir.At present,the pressure-sensitivity effect has not been taken into consideration for the available productivity forecast models of steam stimulation,which shows a significant deviation and poor applicability.Based on the fluid seepage theory of low-permeability heavy-oil reservoir,lateral radial flow pressure distribution pattern and formation temperature distribution pattern,the pressure-sensitivity equation was used to deduce a productivity forecast model for horizontal and vertical wells in the low-permeability heavy-oil reservoir by considering starting pressure and pressure-sensitivity.Then it was applied to a certain block in Shengli Oilfield.Research indicates that the actual cumulative oil production of 3 horizontal wells in the pilot test area is 4695 t,the forecasted cumulative oil production is 4893 t and the corresponding forecast error is only 4.22%.The actual cumulative oil production of 12 vertical wells in the pilot test area is 3868 t,the forecasted cumulative oil production is 4080 t and the corresponding forecast error is only 5.46%.This research can be applied to evaluate the productivity of low-permeability heavy-oil reservoirs and could also provide a theoretical basis for the efficient development.

关 键 词：低渗透 稠油 压敏效应 变启动压力 产能预测模型 胜利油田 

分 类 号：TE349[石油与天然气工程—油气田开发工程]