塔里木盆地顺北一区柯吐尔组失稳特征及钻井液技术研究
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摘要
针对塔里木盆地顺北一区三叠系柯吐尔组坍塌掉块、井径扩大的问题,通过开展微观结构分析,以及进一步实验评价不稳定地层阳离子交换量、岩屑膨胀率和分散性等理化性能,详细研究了复杂地层的坍塌机理。结果表明,三叠系柯吐尔组属于微裂隙发育的中硬到硬脆性泥岩地层,具有"易水化、强分散"的性质。在16 h热滚、90℃条件下,岩屑回收率仅为7.22%。通过聚合物改性,优选了胺基页岩抑制剂HPA和三元共聚物RHTP-2,形成了高性能水基钻井液体系,该体系在顺北1-9井二开4 802 m的超长裸眼段地层成功应用,柯吐尔组平均井径扩大率为9.6%,井径规则,大大节约了钻井时间,表现出优良的抑制防塌性能,解决了顺北区块上部复杂泥岩钻井技术难题,具有广阔的推广应用前景。
In order to clarify the mudstone clasping and hole enlargement of Triassic Kotuer Formation in Tarim Basin, the paper studies the microstructure of all rock minerals and clay minerals in the unstable strata. The further analysis of physical and chemical properties suggests that the Kotuer Formation belongs to the medium hard to hard brittle mudstone strata with micro-fractures developed. The main geological characteristic is "easy hydration and strong dispersion". The experiment shows that the average recovery rate is only 7.22% after 16 hours and 90℃. This research indicates that the key agents,shale inhibitor HPA and terpolymer RHTP-2 are developed by polymer modification to form a high performance water based drilling fluid system. This system was successfully applied to the open hole of second spud in the Well Shunbei 1-9. The average diameter expansion rate of Kotuer Formation is 9.6%, which is much better than others in this area. The wellbore is effectively protected from sloughing with small enlargement. Field application shows that the technology has broad application prospects.
In order to clarify the mudstone clasping and hole enlargement of Triassic Kotuer Formation in Tarim Basin, the paper studies the microstructure of all rock minerals and clay minerals in the unstable strata. The further analysis of physical and chemical properties suggests that the Kotuer Formation belongs to the medium hard to hard brittle mudstone strata with micro-fractures developed. The main geological characteristic is "easy hydration and strong dispersion". The experiment shows that the average recovery rate is only 7.22% after 16 hours and 90℃. This research indicates that the key agents,shale inhibitor HPA and terpolymer RHTP-2 are developed by polymer modification to form a high performance water based drilling fluid system. This system was successfully applied to the open hole of second spud in the Well Shunbei 1-9. The average diameter expansion rate of Kotuer Formation is 9.6%, which is much better than others in this area. The wellbore is effectively protected from sloughing with small enlargement. Field application shows that the technology has broad application prospects.
引文
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[11] 唐林,罗平亚.泥页岩井壁稳定性的化学与力学耦合研究现状[J].西南石油学院学报,1997,19(2):85-88.
[12] Zhai Z,Abou-Sayed A.Coupled chemical-thermal-poro-mechanical effect on borehole stability[R].SPE 140946,2011.
[13] 刘玉石,白家祉,黄荣樽,等.硬脆性泥页岩井壁稳定问题研究[J].石油学报,1998,19(1):85-89.
[14] Li Yufei,Fu Yongqiang,Tang Geng,et al.Effect of weak bedding planes on wellbore stability for shale gas wells[R].SPE 155666,2012.
[15] You Lijun,Kang Yili,Li Xiangchen.Mitigating borehole instability and formation damage with temporary shielding drilling fluids in low permeability fractured reservoirs[R].SPE165133,2013.
[16] 邱正松.井壁泥页岩与水基钻井液作用机理研究[D].北京:中国石油大学,2001.
[17] 兰凯,刘明国,郑华,等.大压差泥页岩长裸眼斜井段安全钻井技术[J].地质科技情报,2016,35(1),219-221.
[18] 刘天乐,蒋国盛,宁伏龙,等.含动力学抑制剂的聚合醇钻井液水合物抑制性研究[J].地质科技情报,2010,29(1),116-120.
[2] 康毅力,韩耀文.四川盆地九龙山构造须二段致密砂岩孔隙的成因及勘探意义[J].西南石油学院学报,1989,11(4):1-15.
[3] 巩磊,曾联波,张本健,等.九龙山构造致密砾岩储层裂缝发育的控制因素[J].中国石油大学学报:自然科学版,2012,36(6):6-12.
[4] 张孝华,罗兴树.现代泥浆实验技术[M].北京:石油工业出版社,1998.
[5] 高淑梅,范绍雷,梅启亮,等.鄂尔多斯盆地低渗透储层黏土矿物分析[J].特种油气藏,2009,16(3):15-17.
[6] Mengjiao Yu,Martin E C,Mukul M S.Chemical-mechanical wellbore instability model for shales:Accounting for solute diffusion[J].Journal of Petroleum Science and Engineering,2003,38(3):131-143.
[7] 康毅力,罗平亚,沈守文,等.黏土矿物产状和微结构对储层损害的影响[J].西南石油学院学报,1998,20(2):27-29.
[8] Loucks R G,Reed R M,Ruppel S C,et al.Spectrum of pore types and networks in mud rocks and a descriptive classification for matrix-related mudrock pores[J].AAPG Bulletin,2012,96(6):1071-1098.
[9] 方俊伟,牛晓,沈青云,等.碎屑岩侧钻井泥岩防塌钻井液体系实验研究[J].科学技术与工程,2014,14(10):18-23.
[10] Al-Bazali T M,Al-Mudh'hi S,ChenevertM E.An experimental investigation of the impact of diffusion osmosis and chemical osmosis on the stability of shales[J].Petroleum Science and Technology,2011,29(3):312-323.
[11] 唐林,罗平亚.泥页岩井壁稳定性的化学与力学耦合研究现状[J].西南石油学院学报,1997,19(2):85-88.
[12] Zhai Z,Abou-Sayed A.Coupled chemical-thermal-poro-mechanical effect on borehole stability[R].SPE 140946,2011.
[13] 刘玉石,白家祉,黄荣樽,等.硬脆性泥页岩井壁稳定问题研究[J].石油学报,1998,19(1):85-89.
[14] Li Yufei,Fu Yongqiang,Tang Geng,et al.Effect of weak bedding planes on wellbore stability for shale gas wells[R].SPE 155666,2012.
[15] You Lijun,Kang Yili,Li Xiangchen.Mitigating borehole instability and formation damage with temporary shielding drilling fluids in low permeability fractured reservoirs[R].SPE165133,2013.
[16] 邱正松.井壁泥页岩与水基钻井液作用机理研究[D].北京:中国石油大学,2001.
[17] 兰凯,刘明国,郑华,等.大压差泥页岩长裸眼斜井段安全钻井技术[J].地质科技情报,2016,35(1),219-221.
[18] 刘天乐,蒋国盛,宁伏龙,等.含动力学抑制剂的聚合醇钻井液水合物抑制性研究[J].地质科技情报,2010,29(1),116-120.
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