Safe and high-efficiency drilling technology for horizontal sections of shale gas wells in Well Block Zi-201
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摘要: 自201井区是中石油部署在自贡市荣县地区的重点页岩气勘探开发区域，根据该井区的钻井工程实践，水平段工程难点主要有坍塌掉块严重、井壁稳定性差、轨迹控制困难、优质储层钻遇率低、起下钻阻卡频繁等高风险井下故障，严重制约了安全高效施工。针对上述难题，研选无扶螺杆优化钻具组合，降低下部钻具组合的刚性和摩阻；同时，研制了可塑性变形粒子和刚性封堵材料的封堵剂复配配方，在提高密度的基础上，强化了油基钻井液对井壁的支撑性及封堵性，确保了水平段安全高效钻进。实现了自201井区页岩气水平井正常完钻，并且与前期完钻井相比，本轮施工节约钻井周期34.12%，优质储层钻遇率100%，为该区块安全高效作业提供了参考，为增储上产奠定了基础。Abstract: Well Block Zi-201 is a key shale gas exploration and development area invested by PetroChina in the Rongxian area， Zigong city. Drilling of horizontal sections in this well block encountered many engineering challenges， mainly including serious borehole sloughing， hole instability， difficult well path control， low intersection rate of high-quality reservoirs， frequent sticking while tripping， which seriously restricted drilling safety and efficiency. In view of the above problems， the non-stabilizer mud moter was selected to optimize the BHA for reduction of the rigidity and friction of the BHA. At the same time， the compound plugging agent with plastic deformation particles and rigid plugging materials has been developed to improve the density， and strengthens the well wall support and sealing characteristics of the oil-based drilling fluid so as to ensure drilling safety and efficiency in the horizontal sections， and realize the normal completion of horizontal wells in Well Block Zi-201. Moreover， compared with previous drilling， the drilling period has been reduced by 34.12% with the effective intersection rate in high-quality reservoirs up to 100%， which provides a reference for safe and efficient drilling in the block and lays a foundation for increasing explored reserves and production.
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Key words:
- shale gas /
- horizontal section /
- safe drilling /
- non-stabilizer mud moter /
- BHA /
- plugging agent /
- Well Block Zi-201
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