投球调剖技术在大王庄油田特殊注水区块的应用
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摘要
大王庄油田注水井井筒条件复杂、储层结构特殊,常规的机械分注工艺效果较差,注入水单层突进问题严重,水驱效果差。针对该区块套管变形、损坏、地层出砂、夹层薄等问题,开展了投球调剖技术研究。研究结果表明:调剖球密度与措施井注入水的密度差可控制在0.002g/cm~3内,有效封堵率可达80.0%以上;调剖球抗压强度为80MPa,满足封堵射孔炮眼的需要;措施后注水量不变,平均注水压力上升了2.2MPa,吸水剖面改善率为92.8%,主力吸水层吸水强度平均降低了0.7 m~3/(d·m)。现场试验证明:新型调剖球解决了封堵率低、措施有效期短的问题,特别适用于开采效果差、常规分注工艺无法奏效的注水井,尤其适合于解决井段长、井斜大、层数多、夹层小、套管变形或损坏、出砂结垢等存在大修风险的注水井调剖分注。该技术现场操作简单快速,成本低、精度高,具有广泛的应用前景。
The mechanical separate injection shows a poor performance in the water injection well with complex borehole condition and special reservoir structure,which usually leads to serious water breakthrough along single layer and low waterflooding efficiency.The injection-profile control with floating ball is studied to cope with the problems of case deformation and damage,formation sand production,thin interlayer,etc.Study indicates that the density difference between profile-control ball and injecting water can be maintained within 0.002g/cm~3 and the effective sealing rate is up to 80.0%.The compressive strength of profile-control ball is 8MPa,which could seal the perforation hole.After injection-profile control with floating ball,the average water injection pressure is increased by 2.2MPa,the water injection profile improvement rate is up to 92.8%,the average water injection rate of major layer is reduced by 0.7m~3/( d·m).Pilot test illustrates that the new profile-control bass significantly improves the sealing rate and responding period.It is suitable for water injection well with low productivity and poor performance in conventional separate injection process.This technology is especially applicable to the water injection well with high overhaul risk,including long hole section,high inclination,multiple layers,thin interlayer,case deformation or damage,formation sand production and scaling,etc.This technology is featured by simple and rapid operation,low cast,high precision,which shows a wide application prospect.
The mechanical separate injection shows a poor performance in the water injection well with complex borehole condition and special reservoir structure,which usually leads to serious water breakthrough along single layer and low waterflooding efficiency.The injection-profile control with floating ball is studied to cope with the problems of case deformation and damage,formation sand production,thin interlayer,etc.Study indicates that the density difference between profile-control ball and injecting water can be maintained within 0.002g/cm~3 and the effective sealing rate is up to 80.0%.The compressive strength of profile-control ball is 8MPa,which could seal the perforation hole.After injection-profile control with floating ball,the average water injection pressure is increased by 2.2MPa,the water injection profile improvement rate is up to 92.8%,the average water injection rate of major layer is reduced by 0.7m~3/( d·m).Pilot test illustrates that the new profile-control bass significantly improves the sealing rate and responding period.It is suitable for water injection well with low productivity and poor performance in conventional separate injection process.This technology is especially applicable to the water injection well with high overhaul risk,including long hole section,high inclination,multiple layers,thin interlayer,case deformation or damage,formation sand production and scaling,etc.This technology is featured by simple and rapid operation,low cast,high precision,which shows a wide application prospect.
引文
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[2]孙同文,刘永安,牛宗奎,等.投球调剖工艺技术研究[J].油田化学,2003,20(1):20-22.
[3]刘永安,孙同文.注水井调剖用球的设计与制造[J].油田化学,2001,18(2):129-131.
[4]李会雄,栾合飞,陈听宽,等.投球调剖堵水技术模拟试验[J].石油钻采工艺,2002,24(5):40-43.
[5]龙熙华,孙同文,刘永安,等.投球调剖计算机模拟系统研究[J].油气田地面工程,2002,21(1):81-82.
[6]赵晓,李瑞卿.投球调剖工艺技术应用于稠油油藏[J].油气田地面工程,2005,24(12):52-53.
[7]林建.低成本投球调剖工艺研究与应用[J].石化技术,2018,38(7):100-102.
[8]陈现义.水平井预置管柱完井与连续油管带底封分段压裂一体化技术[J].石油钻采工艺,2017,39(1):66-70.
[9]高智梁,郑旭,任宜伟,等.海上X油田水平井智能分采管柱卡堵水潜力井筛选及应用效果分析[J].石油钻采工艺,2017,39(1):88-91.
[10]刘通,郭新江,王雨生,等.川西积液水平井井筒压力及液位预测[J].石油钻采工艺,2017,39(1):97-102.
[11]周杨,李莉,吴忠宝,等.低渗透油藏垂直裂缝井产能预测及分析[J].石油钻采工艺,2017,39(2):146-150.
[12]刘明峰,张宇,熊腊生,等.苏4K-P4井复杂井况下尾管固井工艺[J].石油钻采工艺,2017,39(2):197-200.
[13]付光勇.提高沈阳油田抽油机井系统效率对策研究[J].特种油气藏,2008,15(增刊1):245-247.
[14]袁恩熙.工程流体力学[M].北京:石油工业出版社,2010:85-91.
[15]刘波.抽油机井系统效率影响因素分析及对策研究[D].武汉:长江大学,2013.