CAJ | 학술논문

汶川地震科学钻探四号孔（ WFSD-4）在二开钻进过程中，钻井液受到了较为严重的CO2污染，造成钻井液性能变坏，具体表现为粘切升高，流动性变差，影响了正常钻进。通过分析CO2污染钻井液的影响因素，并结合钻井液遭受CO2污染的机理和特点，在室内实验和现场应用的基础上，总结出了CO2污染的规律、性能特征及相应的处理措施：即在保证钻井液pH值的条件下，通过石灰除去钻井液中的酸根离子等。
문천지진과학찬탐사호공（ WFSD-4）재이개찬진과정중，찬정액수도료교위엄중적CO2오염，조성찬정액성능변배，구체표현위점절승고，류동성변차，영향료정상찬진。통과분석CO2오염찬정액적영향인소，병결합찬정액조수CO2오염적궤리화특점，재실내실험화현장응용적기출상，총결출료CO2오염적규률、성능특정급상응적처리조시：즉재보증찬정액pH치적조건하，통과석회제거찬정액중적산근리자등。
In the process of the fourth hole (WFSD-4) of Wenchuan earthquake scientific drilling project, the drilling fluid was contaminated by CO2 seriously and the drilling fluid performance was deteriorated with sticking&cutting increas-ing and poor liquidity, by which normal drilling was affected.Through the analysis on the influence factors of CO2 on drill-ing fluid and according to the mechanism and characteristics of drilling fluid contamination by CO2 , the contamination rules, performance characteristics and corresponding treatment measures are summed up based on the laboratory experi-ments and field application cases:with pH value of drilling fluid keeping, acid radical ion etc.in drilling fluid can be re-moved by lime.