Design and Drilling of Well Mashen 1
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摘要: 马深1井是部署在四川盆地的一口超深井，存在井身质量控制困难、钻井提速难度大、喷漏风险并存、钻井液和水泥浆性能维护难度大、固井质量难以保证等钻井技术难点。为此，根据该井所钻遇地层的特点，充分考虑预探井风险，在保证钻井安全的前提下，兼顾井身质量、效率、经济等因素，将井身结构设计为导管+五开井身结构，设计采用氯化钾聚胺磺化防塌钻井液和胶乳防气窜固井水泥浆，并在实钻中采用气体和泡沫钻井技术、"螺杆+PDC钻头"复合钻井技术、"涡轮钻具+孕镶金刚石钻头"钻井技术及"旋冲工具+PDC钻头"钻井技术等提速技术。该井钻井过程顺利，提速效果明显，表明该井的钻井工程设计合理，所采用的提速技术针对性强，可以解决该井存在的钻井技术难点。Abstract: Well Mashen 1 is an ultra-deep well drilled in the Sichuan Basin. Drilling of the well was characterized by difficulties in borehole quality control,ROP enhancement,coexistence of lost circulation and blowout,maintenance of desirable performances of drilling fluids and cement slurries,and quality control in cementing operations. Under such circumstances,a casing program involving conductor plus five spud-in intervals had been designed on the basis of specific features and risks of target formations,together with safety of drilling operations,quality,efficiencies,economic performances and other factors. According to the design,KCl polyamine sulfonation anti-sloughing drilling fluid and latex anti-gas channeling cement slurry system were to be used. In practice,gas drilling,foam drilling,"PDM drill plus PDC bit"composite drilling techniques,"turbo drill plus diamond-impregnated bit","RSS plus PDC bit" and other techniques had been deployed to enhance ROP. Drilling processes of the well were satisfactory with significant enhancement in ROPs. Generally speaking,the engineering design for the Well Mashen 1 was rational and all techniques adopted were satisfactory and could effectively remove drilling technical challenges.
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Keywords:
- ultra-deep well /
- drilling design /
- casing program /
- drilling fluid /
- cementing /
- cement slurry /
- gas drilling /
- downhole motor drilling /
- Well Mashen 1
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