| 程枫,罗向荣,赵智强,郭鸿,刘建强,任晓娟,王治国,张鹏飞.关中地区疏松砂岩热储钻井液损害因素评价及体系配方优化研究[J].矿产勘查,2025,16(4):878-887 |
| 关中地区疏松砂岩热储钻井液损害因素评价及体系配方优化研究 |
| Evaluation of drilling fluid damage factors and study on formula optimiza-tion for unconsolidated sandstone geothermal reservoir in Guanzhong area |
| 投稿时间：2024-06-03 |
| DOI：10.20008/j.kckc.202504018 |
| 中文关键词: 关中地区 热储层 钻井液损害 固相颗粒侵入 配方优化 |
| 英文关键词: Guanzhong area geothermal reservoir drilling fluid damage solids invasion formulation optimization |
| 基金项目:本文受国家自然科学基金项目(52074220)、陕西省自然科学基础研究计划项目(2021JQ-599)、陕西省地质勘查基金项目(61201908332)和西安石油大学研究生创新与实践能力培养计划(YCS23214208)联合资助。 |
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| 中文摘要: |
| 在关中地区热储层的钻井过程中，水基聚合物钻井液对疏松砂岩热储层的损害普遍较大，因此，选择与热储层岩石及流体相容、适应地层压力的钻井液体系，是确保热储层开发成功的关键因素。本文以关中地区热储层为研究对象，深入剖析钻井液对热储的损害因素，进而开展室内损害评价，根据损害因素分析和评价结果确定体系配方组成并进行优化，最终提出一套强抑制性无固相聚合物钻井液体系配方。研究结果表明，受钻井液中固相颗粒侵入的影响，钻井液对中砂岩和砂砾岩有较大的损害，砂砾岩和中砂岩的平均渗透率损害率分别大于 95%和 98.3%，同时钻井液侵入还会引起疏松地层微粒运移和水敏损害。优化得到的无固相钻井液体系以 KPAM(聚丙烯酰胺钾盐)为抑制剂，以 PAC(聚阴离子纤维素)为降滤失剂，该配方对抑制岩屑分散，降低钻井液的滤失量和增加钻井液黏度有很好的效果，适用温度可达 120 ℃，对热储层的损害率为 41.2%~50.0%，减小了对热储的损害。 |
| 英文摘要: |
| In the drilling process of geothermal reservoir in Guanzhong area, the damage of water-based poly-mer drilling fluid to loose sandstone geothermal reservoir is generally large. Therefore, the selection of drilling fluidsystem compatible with geothermal reservoir rock and fluid and adapting to formation pressure is the key factor toensure the success of geothermal reservoir development. In this paper, the geothermal reservoir in Guanzhong areais taken as the research object, and the damage factors of drilling fluid to geothermal reservoir are deeply analyzed,and then the indoor damage evaluation is carried out. According to the analysis of damage factors and the evaluationresults, the formula composition of the system is determined and optimized, and finally a set of strong inhibitorysolid-free polymer drilling fluid system formula is proposed. The results show that the drilling fluid has great dam-age to medium sandstone and glutenite due to the invasion of solid particles in the drilling fluid. The average perme-ability damage rates of glutenite and medium sandstone are greater than 95% and 98.3%, respectively. At the sametime, the invasion of drilling fluid will also cause particle migration and water sensitivity damage in loose forma-tions. The optimized solid-free drilling fluid system uses KPAM (polyacrylamide potassium salt) as an inhibitor andPAC (polyanionic cellulose) as a fluid loss reducer. This formula has a good effect on inhibiting the dispersion of cut-tings, reducing the fluid loss of drilling fluid and increasing the viscosity of drilling fluid. The applicable tempera-ture can reach 120 ℃, and the damage rate to the geothermal reservoir is between 41.2% and 50.0%, which reducesthe damage to the geothermal reservoir. |
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