SHBP-1超深井三开长裸眼钻井液技术

针对SHBP-1井在钻井过程中可能出现的井壁失稳及漏失等复杂问题，对其原因及技术难点进行分析，提出了该井的井壁稳定、防漏堵漏技术思路，选用强抑制强封堵防塌钻井液体系，以满足地层特性对钻井液抑制性、降失水及封堵的要求，筛选了复合抑制剂KCl+SMJA、镶嵌成膜防塌剂SMNA-1、纳米封堵剂SMNF-1，以进一步提高钻井液的抑制性、封堵性及防塌性能，降低高温高压滤失量。经现场应用表明，优化后的强抑制强封堵防塌钻井液流型易于控制，维持井浆中0.5% SMJA、3% KCl、2.5% SMNA-1，保障了钻井液有强的抑制防塌性；在易漏地层使用了纳米封堵剂2% SMNF-1、超细碳酸钙等随钻堵漏材料，避免了井漏的发生，顺利完成了该井的施工，三开井段扩大率仅为3.49%。该套钻井液技术顺利解决了SHBP-1井三开的井眼失稳及井漏问题，为后续类似井的钻井提供借鉴。

Drilling Fluid Technology for Long Open Section of the Third Interval of the Ultra-deep Well SHBP-1

Based on experiences obtained previously, downhole troubles such as borehole wall instability and mud losses may be encountered in drilling the well SHBP-1. By analyzing the roots of the downhole troubles and the technical difficulties, a set of measures to deal with the downhole troubles were formulated. A highly inhibitive drilling fluid was formulated with inhibitive agents KCl and SMJA, mosaic membrane forming agent SMNA-1, nanometer plugging agent SMNF-1. These additives greatly enhanced the inhibitive capacity, plugging performance and HTHP filtration control ability of the drilling fluid. Field operation showed that the rheology of this drilling fluid was easy to control, and the inhibitive capacity of the drilling fluid can be achieved by maintaining 0.5% SMJA, 3% KCl and 2.5% SMNA-1 in the drilling fluid. When drilling mud loss formations, 2% SMNF-1 and ultra-fine calcium carbonate were added into the mud to control mud losses while drilling. With these measures, mud losses were avoided and the drilling operation was successfully completed. Percent hole enlargement of the third interval was only 3.49%. Borehole wall instability and mud losses in the third interval of the well SHBP-1 were thus resolved, providing a technical clue for other similar wells to be drilled in this area.