强抑制强封堵聚胺类钻井液体系研究与应用

Research and Application of Strong Restraining and Plugging Polyamines Drilling Fluid System

李树斌 蹇斯平 何振奎 夏列虎 景国安 赵雨初

LI Shu-Bin JIAN Si-Ping HE Zhen-Kui XIA Lie-Hu JING Guo-An ZHAO Yu-Chu

宝南区块在钻进西山窑组以下地层时，多次发生卡钻、井漏等井下复杂故障，钻井液密度过低是造成该区块井壁失稳主要原因。本文进行了适合该区块的钻井液体系的筛选与评价研究，通过性能实验确定了降滤失剂、封堵剂、加重剂、润湿剂的适宜用量，得到钻井液的最佳配方为： 3%土浆+2%降滤失剂SPNH +1%降滤失剂SMP-1+0.3%聚丙烯酸钾+0.3%降滤失剂PAC-LV +0.1%提切剂XCD +2%低荧光防塌剂SFT +2%封堵剂NFA-25 +2%成膜封堵剂CMJ-2 +2%综合封堵剂ZHFD-1 +0.3%聚胺类抑制剂AP-2 +5%白油+0.2%乳化剂ABSN +重晶石，该钻井液的表观黏度为33mPa·s，塑性黏度为24 mPa·s，动切力为9 Pa，动塑比为0.375，高温高压滤失量为10.0～11.0 mL，API滤失量为2.5～2.8 mL，pH值为8～9，密度控制在1.10～1.21 g/cm3。在宝16-1井的现场应用结果表明：该钻井液体系密度设计合理，滤失量低，流变性好，具有很好的封堵防塌效果。起钻阻卡等井下复杂时效为零，缩短了钻井周期，井径扩大率有了大幅度降低，为目前该构造施工比较顺利的一口井,表明强抑制强封堵聚胺防塌钻井液能有效解决该区块的井壁稳定性问题。

When the wells were drilled in and under the formation of the west hill YAO groups in South Bao block，many complicated troubles occurred due to too low density of the drilling fluid used, such as sticking and well leakage. In this paper, the screening and evaluation research of drilling fluid suitable for this block was studied, through performance tests, filtrate reducer, plugging agent and wetting agent were determined, and the optimal recipe of the drilling fluid system was determined as follows: 3%caly+2% fluid loss agent SPNH +1% fluid loss agent SMP-1 +0.3% polyacrylicacid potassium+0.3% fluid loss agent PAC-LV +0.1% richmond agent XCD +2% low fluorescence collapse prevention agent SFT +2% blocking agent NFA-25 +2% film-forming blocking agent CMJ-2 +2% comprehensive blocking agent ZHFD-1 +0.3% polyamine inhibitor AP-2+5% white oil +0.2% surfactant ABSN emulsifier+ barite. The density of the drilling fluid was 1.10～1.21g/cm3, the apparent viscosity was 33 mPa·s, the plastic viscosity was 24 mPa·s, the yield value(YP)was 9 Pa, the dynamic plastic ratio was 0.375,the filter loss in high temperature and high pressure was 10.0-11.0 mL, API filter loss was 2.5-2.8 mL, pH value was 8-9,and the density was controlled among 1.10-1.21 g/cm3. application of the drilling fluid system in Well Bao 16-1 showed that, the drilling fluid system had low filter loss, good rheology and strong plugging and preventing collapse capability. The complicated agents of sticking was zero, the circle of drilling shortened,and the expanding rate of caliper reduced remarkably. Well Bao 16-1 was constructed smoother than the others drilled in the same structure, indicating that strong restraining and plugging polyamine class agents could solve the problem of stability of the well wall in this block effectively.