Dual-effect Drilling Fluids with Weak Gel and Micro Solids for CBM Drilling
-
摘要: 为更好满足煤层气钻井液成膜护壁和尽可能地降低对煤层气储层的伤害,实现安全、高效钻进和保护储层的目的,提出了弱凝胶和微固相双效钻井液体系。室内对其性能进行了评价,结果表明:弱凝胶和微固相双效钻井液具有良好的基础性能;具有很好抑制性、抗温性(50℃)、抗盐(NaCl、CaCl2、MgCl2)侵性和抗煤屑侵性;在500 mL双效钻井液中加入纤维素酶、中性α-淀粉酶、复合酶(0.1 g:0.1 g:0.1 g),最终弱凝胶和微固相钻井液降解率分别可达90.9%和83.0%;具有很好的润滑性,润滑系数分别为0.17和0.12;渗透率恢复率可达到91.3%和82.3%;显微观测可知,增大了钻井液接触角,可很好防止水锁伤害;复合生物酶不仅能降低钻井液表观黏度,在后期通过降解泥皮来降低对煤储层裂隙的伤害,可大大减小对煤层气产出影响。Abstract: Dual-effect drilling fluids with weak gel and micro solids have been developed to better satisfy the needs of borehole wall protection in coal bed methane (CBM) drilling, to minimize the damage to CBM pay zones by drilling fluid, and to realize safe and efficient drilling operations. Laboratory evaluation of the drilling fluids showed that they had excellent basic properties, good inhibitive capacity, temperature resistance (50℃), salt resistance (NaCl, CaCl2, MaCl2) and drilled cutting (coal) tolerance. A 500 mL weak-gel drilling fluid sample and a micro-solid drilling fluid sample treated respectively with 0.1 g cellulose, 0.1 g neutralized α-amylase and 0.1 g compound enzyme had rates of degradation of the two drilling fluid sample were 90.9% and 83.0%, respectively. The weak-gel drilling fluid and the micro-solid drilling fluid had friction coefficient of 0.17 and 0.12, respectively, and percent permeability recovery of 91.3% and 82.3%, respectively, exhibiting good lubricity and reservoir protection capacity. Observation under microscopy showed that contact angles of the two drilling fluids were increased, capable of protecting formations from being damaged by water block. The compound bio-enzyme used in the drilling fluids not only reduced the apparent viscosity of the drilling fluids, it also helped degrade mud cakes, thereby minimizing blocking of fractures in CBM zones, greatly mitigating the negative effects of mud cakes on CBM production.
-
Key words:
- Coal bed methane /
- Weak-gel drilling fluid /
- Micro-solid drilling fluid /
- Bio-enzyme /
- Duel-effect
-
[1] 岳前升,陈军,邹来方,等. 沁水盆地基于储层保护的煤层气水平井钻井液的研究[J]. 煤炭学报,2012(S2):416-419. YUE Qiansheng,CHEN Jun,ZOU Laifang,et al. Research on coalbed methane drilling fluid for horizontal well based on coal reservoir protection in Qinshui Basin[J]. Journal of China Coal Society,2012(S2):416-419. [2] 冯少华,侯洪河. 煤层气钻井过程中的储层伤害与保护[J]. 中国煤层气,2008,5(3):16-19.FENG Shaohua, HOU Honghe. Damages to CBM reservior and its protection during CBM Drilling[J]. China Coalbed Methane,2008,5(3):16-19. [3] 庚勐, 陈浩, 陈振宏,等. 我国煤层气富集规律及资源潜力新认识[J]. 天然气地球科学, 2016, 27(9):1659-1665.GENG Meng,CHEN Hao,CHEN Zhenhong,et al.New recognization of CBM enrichment pattern and resource potential in China[J]. Natural Gas Geoscience, 2016, 27(9):1659-1665. [4] 涂乙,邹来方,汪伟英,等.煤层气井储层的伤害及优选保护钻井工艺[J]. 油气田地面工程,2010,29(2):4-6.TU Yi,ZOU Laifang,WANG Weiying,et al. Reservoir damage of coalbed methane well and drilling technology of optimal protection[J].Oil-Gasfield Surface Engineering,2010,29(2):4-6. [5] 秦建强,刘小康. 煤层气钻井煤储层的保护措施[J]. 中国煤炭地质,2008,20(3):67-68.QIN Jianqiang,LIU Xiaokang.Coal reservoir protective measures during CBM drilling[J].Coal Geology of China, 2008,20(3):67-68. [6] 张振文,高永利,代凤红,等. 影响晓南矿未开采煤层瓦斯赋存的地质因素[J]. 煤炭学报,2007,32(9):950-954.ZHANG Zhenwen,GAO Yongli,DAI Fenghong,et al. The geologic agent affecting the gas occurrence of the coal seam unmined in Xiaonan coal mine[J]. Journal of China Coal Society,2007,32(9):950-954. [7] A1-YAMI A S,NASR-EL-DIN H A,BATAWEEL M A, et al.Formation damage induced by various water-based nuids used to driIl HP/HT wells[R]. SPE 112421,2008. [8] LAKATOSI,BODIT,IJAKATOS-SZABO J,et al. Mitigation of formation damage caused by water-based drilling fluids in unconventional gas reservoirs[R].SPE 127999,2010. [9] ZAKARIA M,HUSEIN M,HARELAND G. Novel nanoparticle-based drilling fluid with improved characteristics[R]. SPE 156992,2012. [10] 陈军,马玄,岳前升,等. 沁水盆地清水钻井液对煤储层损害机理[J]. 煤矿安全,2014,45(11):68-71.CHEN Jun,MA Xuan,YUE Qiansheng,et al. Damage mechanism of clear water drilling fluid on coal reservoir in Qinshui basin[J]. Safety in Coal Mines, 2014,45(11):68-71. [11] 岳前升,邹来方,蒋光忠,等. 煤层气水平井钻井过程储层损害机理[J]. 煤炭学报,2012,37(1):91-95.YUE Qiansheng,ZOU Laifang,JIANG Guangzhong,et al. Lab investigation on damage mechanism of coal reservoir for pinnate horizontal well based on coalbed methane[J]. Journal of China Coal Society,2012,37(1):91-95. [12] 黄质强,蒋光忠,郑双进,等.煤层气储层保护钻井关键技术研究[J]. 石油天然气学报,2010,32(6):116-118.HUANG Zhiqiang,JIANG Guangzhong,ZHENG Shuangjin,et al. The Key drilling technique of formation protection for coal-bed methane[J]. Journal of Oil And Gas Technology,2010,32(6):116-118. [13] 王怀勐,朱炎铭,李摇伍,等. 煤层气赋存的两大地质控制因素[J]. 煤炭学报,2011,36(7):1129-1135.. WANG Huaimeng,ZHU Yanming,LI Yaowu,et al. Two major geological control factors of occurrence characteristics of CBM[J]. Journal of China Coal Society, 2011,36(7):1129-1135. [14] 梁利,管保山,刘萍,等. 双生阳离子表面活性剂压裂液在煤层气井的应用[J]. 煤炭科学技术,2016,44(5):112-115.LIANG Li,GUAN Baoshan,LIU Ping,et al. Twin cationic surfactant fracturing fluid applied to coalbed methane well[J]. Coal Science and Technology,2016, 44(5):112-115. [15] 王道宽,乌效鸣,朱永刚,等. 表面活性剂改善钻井液速溶的效果评价[J]. 煤田地质与勘探, 2015,43(5):117-120.WANG Daokuan,WU Xiaoming,ZHU Yonggang, et al. Laboratory study of influence of surfactants on the drilling fluid[J]. Coal Geology & Exploration,2015,43(5):117-120. [16] AMANULLAH M,AL-ABDULLATIF Z. Preliminary test results of a water based nanofluid[C]//The 8th International Conf. & Exhib. On Chemistry in industry,2010:18-20. [17] AMANULLAH M,AL-ARFAJ K,AL-ABDULLATIF Z. Preliminary test results of nano-based drilling fluids for oil and gas field application[R]. SPE/IADC 139534,2011. [18] Meng L, Connell L D. Dual porosity processes in coal seam reservoirs:The effect of heterogeneity of coal matirces[C]//2010 SPE Asia Pacific Oil & Gas Conference. Adelaide,2010, 42.
点击查看大图
计量
- 文章访问数: 424
- HTML全文浏览量: 142
- PDF下载量: 153
- 被引次数: 0