摘要
新疆玛湖井区纳微孔隙裂缝地层发育,多次出现塌漏同层现象,导致井壁失稳严重,严重影响钻井进程。本文采用水溶液聚合方法,以KH570改性纳米二氧化硅为“核”,通过加成反应将2-丙烯酰胺-2-甲基丙磺酸、聚乙烯吡咯烷酮、二甲基二烯丙基氯化铵接枝在mSiO2表面,制备了一种抗高温的自适应强封堵剂。实验结果表明,XZ-APA的形态为球形,尺寸在40~135 nm之间;XZ-APA粒径随温度、浓度变化而自适应膨胀,温度从25℃升高至65℃时,D_(50)从124.2 nm膨胀为805.5 nm。浓度从0.1 g/L增加至10 g/L时,D_(50)从105 nm膨胀至3.2μm,达到微米级别,可实现纳微孔隙裂缝地层的多级封堵。砂床实验中,3%XZ-APA使40~60目、60~80目砂床的漏失量从119 mL、128 mL减少至29 mL、25 mL。压力传递实验中,3%XZ-APA对玛湖井区的岩心(岩心特征)也具有良好的封堵效果,压力传递速率降低率达72%以上。在钻井液体系中加入2%XZ-APA,可将40~60目砂床的漏失量从3.2 mL降低至1.2 mL,可承压6 MPa以上,使20~40目砂床的漏失量从全漏(300 mL)降低至44 mL,承压能力从1 MPa升至6 MPa以上,表明XZ-APA在WBDFs中可以有效封堵,提高承压能力。同时,其封堵效果优于常规封堵材料(如沥青等),且可与常规封堵材料复合使用,封堵效果更好。本文以XZ-APA为核心处理剂,形成了一套适用于玛湖井区的抗高温自适应强封堵水基钻井液体系,有助于解决玛湖井区滤液侵入导致的井壁失稳问题。
The formation of nano-micropore fractures in the Mahu well area of Xinjiang is developed,and the phenomenon of collapse and leakage in the same layer occurs many times,which leads to serious wellbore instability and seriously affects the drilling process.In this paper,2-acrylamide-2-methylpropanesulfonic acid,polyvinyl pyrrolidone and dimethyl diallyl ammonium chloride were grafted onto the surface of mSiO2 by aqueous solution polymerization with KH570 modified nano-silica as the‘core’.A self-adaptive strong plugging agent with high temperature resistance was prepared.The experimental results show that the morphology of XZ-APA is spherical,and the size is between 40 nm and 135 nm.The particle size of XZ-APA expanded adaptively with changes of temperature and concentration.When the temperature increased from 25°C to 65°C,the D_(50) expanded from 124 nm to 805 nm.When the concentration increases from 0.1 g/L to 10 g/L,the D_(50) expands from 105 nm to 3.2μm,reaching micron level,which can realize multi-stage plugging of nano-microporous fractured formations.In the sand bed experiment,3%XZ-APA reduced the leakage of 40~60 mesh and 60~80 mesh sand beds from 119 mL and 128 mL to 29 mL and 25 mL.In the pressure transfer experiment,3%XZ-APA also has a good plugging effect on the core from the Mahu well area,and the pressure transfer rate is reduced by more than 72%.By adding 2%XZ-APA to the drilling fluid system,the leakage of the 40~60 mesh sand bed can be reduced from 3.2 mL to 1.2 mL,and the pressure bearing capacity can be more than 6 MPa.The leakage of the 20~40 mesh sand bed is reduced from 300 mL to 44 mL,and the pressure bearing capacity is increased from 1 MPa to more than 6 MPa,indicating that XZ-APA can be effectively blocked in WBDFs and improve the pressure bearing capacity.At the same time,its plugging effect is better than that of conventional plugging materials(such as asphalt),and can be used in combination with conventional plugging materials to achieve a better plugging effect.In this paper,XZ-APA is used as the core treatment agent to form a set of water-based drilling fluid systems with high temperature resistance and self-adaptive strong plugging suitable for the Mahu well area,which is helpful to solve the problem of wellbore instability caused by filtrate invasion in the Mahu well area.
作者
贾永红
吴家乐
张蔚
叶安臣
崔新环
杨丽丽
JIA Yonghong;WU Jiale;ZHANG Wei;YE Anchen;CUI Xinhuan;YANG Lili(Drilling Fluid Branch Company of WDEC Limited,Karamay 834000,China;Key Laboratory of Petroleum Engineering Ministry of Education,China University of Petroleum-Beijing,Beijing 102249,China)
出处
《石油科学通报》
2024年第6期1034-1043,共10页
Petroleum Science Bulletin
关键词
钻井液
自适应
封堵剂
纳米材料
水基钻井液体系
drilling fluid
adaptive
plugging agent
nanometer materials
water based drilling fluid system
作者简介
第一作者:贾永红(1979年-),本科、高级工程师,从事钻井液技术研究,jiayh2006@cnpc.com.cn;通信作者:杨丽丽(1988年-),博士、副教授,从事油气井化学、油田化学和油气藏保护相关理论和技术研究,yangll@cup.edu.cn。
