考虑应力阻隔和干扰效应的分段多簇压裂诱导应力计算模型
|
摘要
针对水平井分段多簇压裂过程中段内多条裂缝同步扩展的形成特点,考虑裂缝间存在的应力阻隔效应和应力干扰效应,分析了段内各条裂缝诱导应力的影响范围以及其相对于不同位置处的有效净压力,建立了水平井分段多簇压裂段内不同位置处诱导应力计算模型.通过研究得出如下认识:第N段压裂之前段内各点受到的诱导应力为之前各段最后一条裂缝产生的诱导应力的叠加,第N段压裂过程中段内各点受到的诱导应力是与其相邻的裂缝产生的;最小水平地应力方向的诱导应力抵消了一部分缝内净压力,应根据应力阻隔和应力干扰效应以及之前各段压裂诱导应力的分布计算每条裂缝相对于左右两侧地层的有效净压力以及诱导应力.考虑多条裂缝同步扩展时的应力阻隔和应力干扰效应以及有效净压力变化的分段多簇压裂诱导应力计算模型更为符合实际的工况情况,具有较高的精度,能够为水平井分段多簇压裂优化设计提供更为准确的理论指导.
A induced stress calculation model of different positions in staged multi-cluster fractures in horizontal wells was established by analyzed the size of induced stress of fractures and the corresponding effective net pressure in different positions, in view of the formation characteristics of multi-fracture extend synchronously in the process of staged multi-cluster fracturing in horizontal wells and the stress resistance and stress interference between fractures. The results show that: the induced stress of the last fracture in every fracturing stage which is fractured before, will add up to the next fracturing stage. The induced stress in every fracturing stage is generated with its adjacent fracture. The induced stress in the direction of minimum horizontal stress can offset a small part of fracture net pressure, the effective net pressure and induced stress created by previous fracturing in the position of every fracture which is relative to each sides of the formation should be calculated according to the stress resistance and stress interference in staged multi-cluster fracturing, and the distribution of every induced stress in fracturing stages. This induced stress calculation model with high precision can conform to the actual situation more closely, and provide more theoretical guidance during the optimization means and methods of staged multi-cluster fracturing in horizontal wells.
A induced stress calculation model of different positions in staged multi-cluster fractures in horizontal wells was established by analyzed the size of induced stress of fractures and the corresponding effective net pressure in different positions, in view of the formation characteristics of multi-fracture extend synchronously in the process of staged multi-cluster fracturing in horizontal wells and the stress resistance and stress interference between fractures. The results show that: the induced stress of the last fracture in every fracturing stage which is fractured before, will add up to the next fracturing stage. The induced stress in every fracturing stage is generated with its adjacent fracture. The induced stress in the direction of minimum horizontal stress can offset a small part of fracture net pressure, the effective net pressure and induced stress created by previous fracturing in the position of every fracture which is relative to each sides of the formation should be calculated according to the stress resistance and stress interference in staged multi-cluster fracturing, and the distribution of every induced stress in fracturing stages. This induced stress calculation model with high precision can conform to the actual situation more closely, and provide more theoretical guidance during the optimization means and methods of staged multi-cluster fracturing in horizontal wells.
引文
[1]Waters G,Dean B,Downie R,et al.Simultaneous hydraulic fracturing of adjacent wells in the woodford shale[R].SPE 119635,2009.
[2]Cheng Y.Mechanical interaction of multiple fractures-exploring impacts of the selection of the spacing/number of perforation clusters on horizontal shale-gas wells[J].SPE Journal,2012,December:992-1001.
[3]Wu K,Jon E.Investigation of critical in situ and injection factors in multi-fractreatments:guidelines for controlling fracture complexity[R].SPE 163821,2013.
[4]王宇,李晓,王金波等.水力压裂中的应力阴影效应与数值计算[J].天然气地球科学,2015,26(10):1941-1950.
[5]刘立峰,冉启全,王欣等.致密储层水平井体积压裂段间距优化方法[J].石油钻采工艺,2015,37(3):84-87.
[6]Hyunil J.Optimizing fracture spacing to induce complex fractures in a hydraulically fractured horizontal wellbore[R].SPE 154930,2012.
[7]Hyunil J,Baker H.Optimal fracture spacing of a hydraulically fractured horizontal wellbore to induce complex fractures in a reservoir under high in-situ stress anisotropy[R].IPTC 16717,2013.
[8]Roussel N P,Sharma M M.Optimizing fracture spacing and sequencing in horizontal well fracturing[R].SPE 127986,2010.
[9]尹建,郭建春,曾凡辉.水平井分段压裂射孔间距优化方法[J].石油钻探技术,2012,40(5):67-71.
[10]邵尚奇,田守,李根生等.水平井缝网压裂裂缝间距的优化[J].石油钻探技术,2014,42(1):86-90.
[11]曾顺鹏,张国强,韩家新等.多裂缝应力阴影效应模型及水平井分段压裂优化设计[J].天然气工业,2015,35(3):55-59.
[12]常鑫,程远方,时贤等.水平井分段压裂簇间应力作用分析[J].中国海上油气,2016,28(2):109-119.
[13]李海涛,卢宇,谢斌等.水平井多段分簇射孔优化设计[J].特种油气藏,2016,23(6):133-136.
[14]周再乐,张广清,熊文学,等.水平井限流压裂射孔参数优化[J].断块油气田,2015,22(3):374-378.
[15]Olson J E,Wu K.Sequential versus simultaneous multi-zone fracturing in horizontal wells:insights from a non-planar,multi-frac numerical model[R].SPE 152602,2012.
[16]Wu K,Olson J E.Simultaneous multifracture treatments:fully coupled fluid flow and fracture mechanics for horizontal wells[J].SPE J,2015,20(2):337-346.
[17]Wu K,Olson J E.A simplified three-dimensional displacement discontinuity method for multiple fracture simulations[J].International Journal of Fracture,2015,193(2):191-204.
[18]Wu K,Olson J E.Numerical investigation of complex hydraulic-fracture development in naturally fractured reservoirs[J].International Journal of Health Geographics,2015,6(1):1-15.
[19]郭天魁,张士诚,刘卫来等.页岩储层射孔水平井分段压裂的起裂压力[J].天然气工业,2013,33(12):87-93.
[20]翁定为,严星明,卢拥军等.考虑应力干扰的致密油气压裂设计及实现方法[J].中国矿业大学学报,2014,43(4):639-645.
[2]Cheng Y.Mechanical interaction of multiple fractures-exploring impacts of the selection of the spacing/number of perforation clusters on horizontal shale-gas wells[J].SPE Journal,2012,December:992-1001.
[3]Wu K,Jon E.Investigation of critical in situ and injection factors in multi-fractreatments:guidelines for controlling fracture complexity[R].SPE 163821,2013.
[4]王宇,李晓,王金波等.水力压裂中的应力阴影效应与数值计算[J].天然气地球科学,2015,26(10):1941-1950.
[5]刘立峰,冉启全,王欣等.致密储层水平井体积压裂段间距优化方法[J].石油钻采工艺,2015,37(3):84-87.
[6]Hyunil J.Optimizing fracture spacing to induce complex fractures in a hydraulically fractured horizontal wellbore[R].SPE 154930,2012.
[7]Hyunil J,Baker H.Optimal fracture spacing of a hydraulically fractured horizontal wellbore to induce complex fractures in a reservoir under high in-situ stress anisotropy[R].IPTC 16717,2013.
[8]Roussel N P,Sharma M M.Optimizing fracture spacing and sequencing in horizontal well fracturing[R].SPE 127986,2010.
[9]尹建,郭建春,曾凡辉.水平井分段压裂射孔间距优化方法[J].石油钻探技术,2012,40(5):67-71.
[10]邵尚奇,田守,李根生等.水平井缝网压裂裂缝间距的优化[J].石油钻探技术,2014,42(1):86-90.
[11]曾顺鹏,张国强,韩家新等.多裂缝应力阴影效应模型及水平井分段压裂优化设计[J].天然气工业,2015,35(3):55-59.
[12]常鑫,程远方,时贤等.水平井分段压裂簇间应力作用分析[J].中国海上油气,2016,28(2):109-119.
[13]李海涛,卢宇,谢斌等.水平井多段分簇射孔优化设计[J].特种油气藏,2016,23(6):133-136.
[14]周再乐,张广清,熊文学,等.水平井限流压裂射孔参数优化[J].断块油气田,2015,22(3):374-378.
[15]Olson J E,Wu K.Sequential versus simultaneous multi-zone fracturing in horizontal wells:insights from a non-planar,multi-frac numerical model[R].SPE 152602,2012.
[16]Wu K,Olson J E.Simultaneous multifracture treatments:fully coupled fluid flow and fracture mechanics for horizontal wells[J].SPE J,2015,20(2):337-346.
[17]Wu K,Olson J E.A simplified three-dimensional displacement discontinuity method for multiple fracture simulations[J].International Journal of Fracture,2015,193(2):191-204.
[18]Wu K,Olson J E.Numerical investigation of complex hydraulic-fracture development in naturally fractured reservoirs[J].International Journal of Health Geographics,2015,6(1):1-15.
[19]郭天魁,张士诚,刘卫来等.页岩储层射孔水平井分段压裂的起裂压力[J].天然气工业,2013,33(12):87-93.
[20]翁定为,严星明,卢拥军等.考虑应力干扰的致密油气压裂设计及实现方法[J].中国矿业大学学报,2014,43(4):639-645.