鄂尔多斯含硫气井绒囊压井流体暂堵能力测试
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摘要
鄂尔多斯下古奥陶系低压气井测试环节地层漏失严重,利用绒囊修井液封堵结构抗温耐酸性突出,暂堵地层后为气井测试提供安全稳定井筒环境。室内利用直径38 mm、长60 mm岩心柱塞中高0.5 mm贯穿型不规则裂缝模拟地层漏失通道,模拟温度110~150℃,连续注入绒囊修井液至驱压达20 MPa后,反向注入H_2S含量0.1%的酸性气体,测定48 h内驱压衰减幅度小于5%,表明高温酸性环境下承压结构稳定。实验测定绒囊流体返排后天然灰岩基质与裂缝渗透率恢复率87.15%、96.52%,储层保护效果良好。现场应用绒囊修井液于S-2X井、S-4Y井套管腐蚀检测暂堵,两口气井H_2S含量约1 000 mg/m~3,反循环泵入绒囊修井液64 m~3、68 m~3后,井口12h检测无气体,暂堵成功。补充清水33 m~3、20 m~3后见液,套管腐蚀检测作业顺利,气井产气效果恢复快速。该暂堵工艺为鄂尔多斯盆地下古奥套系气井安全测试作业提供了技术支撑。
In Ordos Basin,severe lost circulation was observed during workover operation in high-temperature sulfur-containing lowpressure gas wells in Lower Paleo-Ordovician.The temporary plugging structure formed by fuzzy-ball workover fluid entering the formation leakage channel exhibits considerable high-temperature and acid resistance,it provides a safer and more stable wellbore condition for gas well testing after the formation has been temporarily plugged.In laboratory experiment,formation fluid loss channel was simulated by an irregular-shaped fracture with an aperture of 0.5 mm through a core sample with a diameter of 38 mm and a length of 60 mm.The test temperature was 110~150℃.The temporary plugging structure was formed after continuous injecting fuzzy-ball workover fluid until the driving pressure reached 20 MPa.Then the acid gas containing 0.1%H_2S was injected backward.The driving pressure reduction was less than 5%in 48 h,indicating that the pressure bearing structure was stable under high temperature and acidic environment.The permeability recovery rate after fuzzy-ball fluid flowback were 87.15%and 96.52%for natural sandstone matrix and the fracture,respectively,indicating satisfactory formation protecting effect.Field test of fuzzy-ball workover fluid was carried out in S-2X well and S-4Y well in the central and western Ordos Basin,where the H_2S content was more than 1 000 mg/m~3for each well.No acid gas was detected at the wellhead for each well for 12 hours after 64 m~3and 68 m~3of fuzzy-ball workover fluid was reversely circulated through the casing annulus,implying successful plugging.The wellhead fluid was seen after the follow-up replenishment of 33 m~3and 20 m~3clean water.The workover project was successfully accomplished.The daily gas production rate of the gas wells recovered to the pre-operation level after production resumption.This technique provides technical support for gas well testing intervention in Lower Paleo-Ordovician of Ordos basin.
In Ordos Basin,severe lost circulation was observed during workover operation in high-temperature sulfur-containing lowpressure gas wells in Lower Paleo-Ordovician.The temporary plugging structure formed by fuzzy-ball workover fluid entering the formation leakage channel exhibits considerable high-temperature and acid resistance,it provides a safer and more stable wellbore condition for gas well testing after the formation has been temporarily plugged.In laboratory experiment,formation fluid loss channel was simulated by an irregular-shaped fracture with an aperture of 0.5 mm through a core sample with a diameter of 38 mm and a length of 60 mm.The test temperature was 110~150℃.The temporary plugging structure was formed after continuous injecting fuzzy-ball workover fluid until the driving pressure reached 20 MPa.Then the acid gas containing 0.1%H_2S was injected backward.The driving pressure reduction was less than 5%in 48 h,indicating that the pressure bearing structure was stable under high temperature and acidic environment.The permeability recovery rate after fuzzy-ball fluid flowback were 87.15%and 96.52%for natural sandstone matrix and the fracture,respectively,indicating satisfactory formation protecting effect.Field test of fuzzy-ball workover fluid was carried out in S-2X well and S-4Y well in the central and western Ordos Basin,where the H_2S content was more than 1 000 mg/m~3for each well.No acid gas was detected at the wellhead for each well for 12 hours after 64 m~3and 68 m~3of fuzzy-ball workover fluid was reversely circulated through the casing annulus,implying successful plugging.The wellhead fluid was seen after the follow-up replenishment of 33 m~3and 20 m~3clean water.The workover project was successfully accomplished.The daily gas production rate of the gas wells recovered to the pre-operation level after production resumption.This technique provides technical support for gas well testing intervention in Lower Paleo-Ordovician of Ordos basin.
引文
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[13]王超,王野,任佳,等.超细水泥在储气库老井封堵中的研究与应用[J].钻井液与完井液,2011,28(5):16-18.WANG Chao,WANG Ye,REN Jia,et al.Research and application of superfine cement in job of old well plugging back in underground gas storage facilities[J].Drilling Fluid&Completion Fluid,2011,28(5):16-18.
[14]郑力会,张明伟.封堵技术基础理论回顾与展望[J].石油钻采工艺,2012,34(5):1-9.ZHENG Lihui,ZHANG Mingwei.Review of basic theory for lost circulation control[J].Oil Drilling&Production Technology,2012,34(5):1-9.
[15]郑力会,孔令琛,曹园,等.绒囊工作液防漏堵漏机理[J].科学通报,2010,55(15):1520-1528.ZHENG Lihui,KONG Lingqi,CAO Yuan,et al.The mechanism for fuzzy-ball working fluids for controlling&killing lost circulation[J].Chinese Science Bulletin,2010,55(15):1520-1528.
[16]郑力会,魏攀峰,张峥,等.联探并采:非常规油气资源勘探开发持续发展自我救赎之路[J].天然气工业,2017,37(5):126-140.ZHENG Lihui,WEI Panfeng,ZHANG Zheng,et al.Joint exploration and exploitation:A self-salvation road to sustainable development of unconventional oil and gas resources[J].Natural Gas Industry,2017,37(5):126-140.
[17]郑力会.仿生绒囊钻井液煤层气钻井应用现状及发展前景[J].石油钻采工艺,2011,33(3):78-81.ZHENG Lihui.Application state and prospects of bionic fuzzy-ball drilling fluids for coalbed methane drilling[J].Oil Drilling&Production Technology,2011,33(3):78-81.
[18]LI Zuochen.Practice of fuzzy ball cementing pad fluid in leakage zone of Naiman well N-X-Y[J].Advanced Materials Research,2013,773:714-719.
[19]胡永东,赵俊生,陈家明,等.磨80-C1侧钻水平井绒囊钻井液实践[J].钻采工艺,2013,36(1):110-113.HU Yongdong,ZHAO Junsheng,CHEN Jiaming,et al.Mo 80-C1 sidetracking horizontal wells fracturing drilling practice[J].Drilling&Production Technology,2013,36(1):110-113.
[20]王金凤,郑力会,张耀刚,等.天然气井的绒囊流体活塞修井技术[J].天然气工业,2015,35(12):53-57.WANG Jinfeng,ZHENG Lihui,ZHANG Yaogang,et al.Fuzzy-ball fluid piston workover technology for natural gas wells[J].Natural Gas Industry,2015,35(12):53-57.
[21]王珊,曹砚峰,姜文卷,等.渤海某油田绒囊暂堵流体修井工艺[J].石油钻采工艺,2015,37(3):114-117.WANG Shan,CAO Yufeng,JIANG Wenjuan,et al.Workover technology using fuzzy-ball temporary plugging fluid in Bohai Oilfield[J].Petroleum Drilling&Production Technology,2015,37(3):114-117.
[22]郑力会,翁定为.绒囊暂堵液原缝无损重复压裂技术[J].钻井液与完井液,2015,32(3):76-78.ZHENG Lihui,WENG Dingwei.Study on repeating fracturing while causing no damage to original fractures[J].Drilling Fluid&Completion Fluid,2015,32(3):76-78.
[23]李治,魏攀峰,吕建,等.天然气井绒囊流体活塞技术不降压压井工艺[J].天然气工业,2018,35(2):90-96.LI Zhi,WEI Panfeng,LYU Jian,et al.A gas well killing process without pressure release based on the fuzzy-ball fluid piston technology[J].Natural Gas Industry,2018,35(2):90-96.
[2]倪春华,周小进,王保华.鄂尔多斯盆地南部地区富古4井硫化氢成因探讨[J].石油天然气学报(江汉石油学报),2010,32(5):204-206.NI Chunhua,ZHOU Xiaojin,WANG Baohua.On the genesis of hydrogen sulfide of well Fugu 4 in the South of Ordos basin[J].Journal of Oil and Gas Technology,2010,32(5):204-206.
[3]朱光有,张水昌,梁英波.中国海相碳酸盐岩气层硫化氢形成的控制因素和分布预测[J].科学通报,2007(a01):115-125.ZHU Guangyou,ZHANG Shuichang,LIANG Yingbo.Hydrocarbon accumulation conditions and exploration potential of deep reservoirs in China[J].Chinese Science Bulletin,2007(a01):115-125.
[4]庞伟.酸性气藏深井产能试井方法[J].油气井测试,2018,27(2):67-72.PANG Wei.Deliverability test method for deep sour gas wells[J].Well Testing,2018,27(2):67-72.
[5]任源峰,吴志均,张利明,等.油气井除硫及残酸液处理装置的研制与应用[J].油气井测试,2017,26(1):45-48.REN Yuanfeng,WU Zhijun,ZHANG Liming,et al.Development and application of oil and gas well de sulfur and residual acid liquid treatment device[J].Well Testing,2017,26(1):45-48.
[6]郑如森,高文祥,邹国庆,等.塔里木油田超高压高产气井压井方法初探[J].油气井测试,2017,26(6):62-64.ZHENG Rusen,GAO Wenxiang,ZOU Guoqing,et al.Apreliminary discussion on killing well of super high pressure and high production in Tarim oilfield[J].Well Testing,2017,26(6):62-64.
[7]杨健.低压气井暂堵修井工艺技术[J].天然气工业,2007,27(5):81-84.YANG Jian.The technology of temporary blocking workover for low pressure gas-wells[J].Natural Gas Industry,2007,27(5):81-84.
[8]贾虎,杨宪民.固化水工作液在压井修井过程中的成功应用[J].钻井液与完井液,2007,24(b09):115-117.JIA Hu,YANG Xianmin.The successful use of solidified water work fluid as kill and well workover fluids[J].Drilling Fluid&Completion Fluid,2007,24(b09):115-117.
[9]邱玲,黄小军,黄贵存,等.低压气井液体胶塞暂堵技术研究及应用[J].断块油气田,2011,18(3):393-396.QIU Ling,HUANG Xiaojun,HUANG Guicun,et al.Research and application of temporary blocking technology using gel plug in low-pressure gas well[J].Fault Block Oil&Gas Field,2011,18(3):393-396.
[10]陈东波,朱勇,徐刚,等.修井作业中低渗漏压井液的研究和应用[J].钻井液与完井液,2013,30(5):53-55.CHEN Dongbo,ZHU Yong,XU Gang,et al.Research and application of low filtration workover fluid[J].Drilling Fluid&Completion Fluid,2013,30(5):53-55.
[11]卢宏伟,唐瑜,张宏,等.低伤害暂堵压井液体系在储气库老井修井中的应用[J].石油化工应用,2016,35(6):106-108.LU Hongwei,TANG Yu,ZHANG Hong,et al.Low damage temporary blocking killing fluid system application results in gas storage wells in old wells workover analysis[J].Petrochemical Industry Application,2016,35(6):106-108.
[12]张凤英,鄢捷年,杨光,等.新型油溶暂堵型无固相修井液的研制[J].天然气工业,2010,30(3):77-79.ZHANG Fengying,YAN Jienian,YANG Guang,et al.Formulation and performance of new non-solids oil-soluble temporary-plugging workover fluids[J].Natural Gas Industry,2010,30(3):77-79.
[13]王超,王野,任佳,等.超细水泥在储气库老井封堵中的研究与应用[J].钻井液与完井液,2011,28(5):16-18.WANG Chao,WANG Ye,REN Jia,et al.Research and application of superfine cement in job of old well plugging back in underground gas storage facilities[J].Drilling Fluid&Completion Fluid,2011,28(5):16-18.
[14]郑力会,张明伟.封堵技术基础理论回顾与展望[J].石油钻采工艺,2012,34(5):1-9.ZHENG Lihui,ZHANG Mingwei.Review of basic theory for lost circulation control[J].Oil Drilling&Production Technology,2012,34(5):1-9.
[15]郑力会,孔令琛,曹园,等.绒囊工作液防漏堵漏机理[J].科学通报,2010,55(15):1520-1528.ZHENG Lihui,KONG Lingqi,CAO Yuan,et al.The mechanism for fuzzy-ball working fluids for controlling&killing lost circulation[J].Chinese Science Bulletin,2010,55(15):1520-1528.
[16]郑力会,魏攀峰,张峥,等.联探并采:非常规油气资源勘探开发持续发展自我救赎之路[J].天然气工业,2017,37(5):126-140.ZHENG Lihui,WEI Panfeng,ZHANG Zheng,et al.Joint exploration and exploitation:A self-salvation road to sustainable development of unconventional oil and gas resources[J].Natural Gas Industry,2017,37(5):126-140.
[17]郑力会.仿生绒囊钻井液煤层气钻井应用现状及发展前景[J].石油钻采工艺,2011,33(3):78-81.ZHENG Lihui.Application state and prospects of bionic fuzzy-ball drilling fluids for coalbed methane drilling[J].Oil Drilling&Production Technology,2011,33(3):78-81.
[18]LI Zuochen.Practice of fuzzy ball cementing pad fluid in leakage zone of Naiman well N-X-Y[J].Advanced Materials Research,2013,773:714-719.
[19]胡永东,赵俊生,陈家明,等.磨80-C1侧钻水平井绒囊钻井液实践[J].钻采工艺,2013,36(1):110-113.HU Yongdong,ZHAO Junsheng,CHEN Jiaming,et al.Mo 80-C1 sidetracking horizontal wells fracturing drilling practice[J].Drilling&Production Technology,2013,36(1):110-113.
[20]王金凤,郑力会,张耀刚,等.天然气井的绒囊流体活塞修井技术[J].天然气工业,2015,35(12):53-57.WANG Jinfeng,ZHENG Lihui,ZHANG Yaogang,et al.Fuzzy-ball fluid piston workover technology for natural gas wells[J].Natural Gas Industry,2015,35(12):53-57.
[21]王珊,曹砚峰,姜文卷,等.渤海某油田绒囊暂堵流体修井工艺[J].石油钻采工艺,2015,37(3):114-117.WANG Shan,CAO Yufeng,JIANG Wenjuan,et al.Workover technology using fuzzy-ball temporary plugging fluid in Bohai Oilfield[J].Petroleum Drilling&Production Technology,2015,37(3):114-117.
[22]郑力会,翁定为.绒囊暂堵液原缝无损重复压裂技术[J].钻井液与完井液,2015,32(3):76-78.ZHENG Lihui,WENG Dingwei.Study on repeating fracturing while causing no damage to original fractures[J].Drilling Fluid&Completion Fluid,2015,32(3):76-78.
[23]李治,魏攀峰,吕建,等.天然气井绒囊流体活塞技术不降压压井工艺[J].天然气工业,2018,35(2):90-96.LI Zhi,WEI Panfeng,LYU Jian,et al.A gas well killing process without pressure release based on the fuzzy-ball fluid piston technology[J].Natural Gas Industry,2018,35(2):90-96.