基于改性植物多酚的高温高密度环保型水基钻井液

刘自广; 宋丰博; 尤志良; 卓绿燕; 彭云涛; 项春芬; 蒋官澄

doi:10.3969/j.issn.1001-5620.2021.03.004

基于改性植物多酚的高温高密度环保型水基钻井液

doi: 10.3969/j.issn.1001-5620.2021.03.004

1. 中石化中原石油工程有限公司钻井二公司, 河南濮阳 475001;
2. 大港油田石油工程研究院, 天津 300280;
3. 中国石油长城钻探工程有限公司钻井液公司, 辽宁盘锦 124200;
4. 渤海钻探第五钻井工程分公司, 河北河间 062465;
5. 中国石油大学(北京)石油工程学院, 北京 102249

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作者简介:

中图分类号: TE254.3
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出版历程
- 收稿日期: 2021-02-07

A high-temperature and High-Density Environmentally-Friendly Water-Based Drilling Fluids Based on Modified Plant Polyphenols

1. The Second Drilling Company of Sinopec Zhongyuan Oilfield Service Corporation, Puyang, Henan 475001;
2. Research Institute of Petroleum Engineering, PetroChina Dagang Oilfield Company, Tianjin 300280;
3. China Petroleum Drilling Fluid, A Branch of GWDC, CNPC, Panjin, Liaoning 124200;
4. No. 5 Drilling Engineering Company, BHDC, Hejian, Hebei 062465;
5. College of Petroleum Engineering, China University of Petroleum, Beijing 102249

摘要

摘要: 为提高环保型水基钻井液的耐温性能和密度上限，通过对天然多酚类植物提取物进行接枝改性，分别研制了降滤失剂EHT-FL和分散剂EHT-TH，并利用红外光谱对2种合成产物进行了表征。室内性能评价结果表明，降滤失剂EHT-FL和分散剂EHT-TH均具有良好的抗高温性能，且EC₅₀分别达2.38×10⁵ mg/L和4.49×10⁵ mg/L，无生物毒性；EHT-FL加量为2.0%时，淡水基浆在200℃老化后的中压滤失量和高温高压滤失量分别为7.2 mL和23.6 mL；EHT-TH加量为1.0%时，高密度水基钻井液（ρ=2.0 g/cm³）在200℃老化后的表观黏度由106.5 mPa·s降低至66.5 mPa·s，高温增稠现象消失。在降滤失剂EHT-FL和分散剂EHT-TH的基础上，配伍其他环境友好型处理剂，研制出一套抗高温高密度（ρ=2.0 g/cm³）环保型水基钻井液体系。该体系具有合理的流变与滤失性能，抗温达210℃，抗盐侵25%，抗钙侵1%，抗劣质土侵10%，EC₅₀为4.19×104 mg/L，BOD₅/COD_Cr为29.23，重金属含量低于标准值，对环境友好，能满足深井复杂地层钻井的需求。
- 水基钻井液 /
- 高温 /
- 高密度 /
- 降滤失剂 /
- 分散剂 /
- 植物多酚 /
- 环境保护
Abstract: To improve the high-temperature resistance and density upper limit of environmentally friendly water-based drilling fluids, the fluid-loss reducer EHT-FL and the thinner EHT-TH were developed by modifying plant extracts of natural polyphenol. Two synthesized products were characterized by infrared spectroscopy. In laboratory experiments, the fluid-loss reducer EHT-FL and the thinner EHT-TH exhibited good high-temperature resistance. And the EC₅₀ reached 2.38×10⁵ mg/L and 4.49×10⁵ mg/L, respectively, with no biological toxicity. The medium-pressure and high-temperature/high-pressure fluid-loss of freshwater-based mud with 2.0% EHT-FL are only 7.2 mL and 23.6 mL after aging at 200℃. When the dosage of EHT-TH is 1.0%, the apparent viscosity of high-density water-based drilling fluid (ρ=2.0 g/cm³) after aging at 200℃ decreases from 106.5 mPa·s to 66.5 mPa·s, and the high-temperature thickening phenomenon disappears. Based on the excellent temperature-resistance of EHT-FL and EHT-TH, a high-temperature and high-density (ρ=2.0 g/cm³) environmentally friendly water-based drilling fluid has been developed. This drilling fluid has reasonable rheological and fluid-loss properties. It has high-temperature resistance of 210℃ and resistance to 25% salt contamination, 1% calcium contamination, and 10% inferior soil contamination. EC₅₀ of this drilling fluid is 4.19×104 mg/L, BOD₅/COD_Cr is 29.23, heavy metal content is lower than the standard value, non-toxic, biodegradable. Therefore, this environmentally friendly drilling fluid can meet the drilling needs of deep-wells complex formations.
- Water-based drilling fluid /
- High temperature /
- High density /
- Fluid loss reducer /
- Dispersant /
- Plant polyphenols /
- Environmental protection

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参考文献(19)

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