延长油田超低渗透油藏水平井分段压裂开采参数优化研究及应用
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摘要
文章基于超低渗透水平井分段压裂大型物理平板模型,进行不同压裂规模、压力驱替下的实验研究。研究结果表明,随着驱替压差的增加,压力梯度升高,相同驱替压差下,裂缝越长,压力梯度越高,增加压裂规模可提高储层动用,在此基础上,针对直井与水平井联合开采井网,对井网形式、水平井长度、裂缝分布形态及导流能力等参数进行了优化,定量表征了对开发效果的影响程度,得到延长油田W区块长9储层800 m水平段采用6~7条裂缝,半长为0. 6倍井距,导流能力为30 D·cm时为最优裂缝布置,最佳井网为水平井采油+直井注水+裂缝交错排列,采用间断型纺锤形布缝时补充能量效果最好,矿场应用后增油效果显著,该研究对延长油田超低渗透储层水平井分段压裂开采参数优选具有重要的理论和矿场意义。
Based on the large physical plate model of stage fracturing in ultra-low permeability horizontal wells,experimental research was done under different fracturing scales and pressure displacement. The research results show that,with the increase in displacement differential pressure and pressure gradient,under the same displacement pressure difference,the longer the crack,the higher the pressure gradient,increasing the fracturing scale can improve the reserve recovery. Based on this,in view of the vertical well and horizontal well combined development pattern, optimization of well pattern, horizontal well length,fracture flow conductivity distribution form and parameters are done,the influence on development effects been quantified. 800 meters long horizontal section in Reservoir 9 at W block Yanchang oil field is decided to have 6-7 fractures,the half length is 0. 6 times well spacing,conductivity 30 d. cm.The optimal well network is horizontal well oil recovery + vertical well water injection + staggered fracture arrangement. The energy replenishment effect is the best when discontinuous spindle-shaped crack pattern adopted. This study is important for the optimization of stage fracturing parameters in ultra-low permeability reservoirs.
Based on the large physical plate model of stage fracturing in ultra-low permeability horizontal wells,experimental research was done under different fracturing scales and pressure displacement. The research results show that,with the increase in displacement differential pressure and pressure gradient,under the same displacement pressure difference,the longer the crack,the higher the pressure gradient,increasing the fracturing scale can improve the reserve recovery. Based on this,in view of the vertical well and horizontal well combined development pattern, optimization of well pattern, horizontal well length,fracture flow conductivity distribution form and parameters are done,the influence on development effects been quantified. 800 meters long horizontal section in Reservoir 9 at W block Yanchang oil field is decided to have 6-7 fractures,the half length is 0. 6 times well spacing,conductivity 30 d. cm.The optimal well network is horizontal well oil recovery + vertical well water injection + staggered fracture arrangement. The energy replenishment effect is the best when discontinuous spindle-shaped crack pattern adopted. This study is important for the optimization of stage fracturing parameters in ultra-low permeability reservoirs.
引文
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[3]赵继勇,樊建明,何永宏,等.超低渗透-致密油藏水平井开发注采参数优化实践-以鄂尔多斯盆地长庆油田为例[J].石油勘探与开发,2015,42(1):69-72.
[4]任龙,苏玉亮,鲁明晶,等.超低渗油藏分段多簇压裂水平井裂缝参数优化[J].西安石油大学学报(自然科学版),2015,30(4):49-51.
[5]焦红岩.水平井压裂参数优化设计研究[J].石油化工高等学校学报,2014,27(1):35-41.
[6]钟家峻,廖新武,赵秀娟,等. BZ25-1低渗透油田压裂水平井参数优化[J].断块油气田,2013,20(6)791-793.
[7]王欢,廖新维,赵晓亮,等.超低渗透油藏分段多簇压裂水平井产能影响因素与渗流规律-以鄂尔多斯盆地长8超低渗透油藏为例[J].油气地质与采收率,2014,21(6):107-110.
[8]石立华,王卫忠,王苛宇,等.特低-超低渗透油藏分段压裂水平井开采参数优化研究及应用[J].兰州大学学报(自然科学版),2018,54(2):156-158.
[9]党海龙,石立华,刘滨,等.延长油田超低渗透油藏水平井分段压裂产量计算模型研究[J].钻采工艺,2017,40(3):51-53.