莺歌海盆地高温高压地层CO2含量随钻评价研究
Study on the evaluation of CO2 content in high-temperature and high-pressure formations using logging while drilling in the Yinggehai Basin
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- 引用格式:
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郭书生,陈现军,伍毅.莺歌海盆地高温高压地层CO2含量随钻评价研究[J].天然气与石油,2025,43(2):66-73.doi:10.3969/j.issn.1006-5539.2025.02.009
GUO Shusheng, CHEN Xianjun, WU Yi.Study on the evaluation of CO2 content in high-temperature and high-pressure formations using logging while drilling in the Yinggehai Basin[J].Natural Gas and Oil,2025,43(2):66-73.doi:10.3969/j.issn.1006-5539.2025.02.009
- DOI:
- 10.3969/j.issn.1006-5539.2025.02.009
- 作者:
- 郭书生1,2,3 陈现军4 伍毅1
GUO Shusheng1,2,3, CHEN Xianjun4, WU Yi1
- 作者单位:
- 1. 中海石油(中国)有限公司海南分公司, 海南 海口 570100; 2. 海南省深海深层能源工程重点实验室, 海南 海口 570100; 3. 中国海油南海油气能源院士工作站, 海南 海口 570100; 4. 中法渤海地质服务有限公司海南分公司, 海南 海口 570100
1. CNOOC China Ltd., Hainan Branch, Haikou, Hainan, 570100, China; 2. Key Laboratory of Deep Sea Deep Formation Energy Engineering of Hainan Province, Haikou, Hainan, 570100, China; 3. CNOOC South China Sea Oil & Gas Energy Academician Workstation, Haikou, Hainan, 570100, China; 4. China France Bohai Geoservices Co., Ltd., Hainan Branch, Haikou, Hainan, 570100, China
- 关键词:
- 高温高压;钻井液;CO2;随钻评价;预测模型
High temperature and high pressure; Drilling fluid; Carbon dioxide; Logging while drilling; Prediction model
- 摘要:
- 莺歌海盆地高温高压酸性气藏勘探开发过程中,由于地层中的酸性气体CO2可迅速溶于钻井液并与之反应,导致气测录井CO2检测量与地层实际CO2含量偏差较大,难以准确评价地层CO2含量。通过实验模拟钻井作业井筒环境,基于CO2与钻井液在高温高压条件下的反应特性,分析pH值、温度、压力、Ca2+、Mg2+、CO2-3、HCO-3的变化量与CO2赋存量的关系,采用多元回归法分析CO2与钻井液作用影响的参数变化规律,建立基于离子浓度变化的CO2在钻井液体系中的赋存量预测模型,得到14个预测方程。结果表明:采用三参数方程测试最为便捷,便于现场应用;采用五参数方程可很好解释钻井液中黏土组分在高压下对CO2的吸附行为;对多参数方程预测结果取平均值,结果偏差在30%以内。研究成果可为使用高碱性泥浆的高温高压井钻探过程中准确预测地层CO2含量提供技术参考。
During the exploration and exploitation of high-temperature and high-pressure acid gas reservoirs in the Yinggehai Basin, the acid gas CO2 in the formation can rapidly dissolve in the drilling fluid and react with it. This leads to a significant deviation between the detected amount of CO2 content in gas logging and the actual CO2 content in the formation, complicating the accurate assessment of the formation's CO2 content. By experimentally simulating the underground wellbore environment of drilling operations, and based on the reaction characteristics of CO2 with drilling fluid under the high-temperature and high-pressure conditions, we analyzed the relationship between pH value, temperature, pressure, calcium and magnesium ions, carbonate, bicarbonate and their respective changes and the CO2 occurrence content. Using multiple regression analysis, we analyzed the pattern of parameter changes influenced by the interaction of CO2 with the drilling fluid and developed a prediction model for CO2 occurrence content in drilling fluid system based on the change of ion concentration, deriving 14 prediction equations. The results show that the three-parameter equation is the most convenient for field application. The five-parameter equation provides a good explanation for the adsorption behavior of clay components in drilling fluid towards CO2 under high pressure. Averaging the prediction results from multi-parameter equation results in a deviation of less than 30%. The research results can provide technical reference for accurate prediction of CO2 content in formations during the drilling of high-temperature and high-pressure wells with high alkaline mud.
