Strengthening Plugging Operations by Combining Cross-Linked Film and Chemical Consolidation in Well Ming-1
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摘要: 明1井二开1 894.00~2 514.00 m井段钻进过程中漏失频发，且地层承压能力低，为保证二开后续井段钻井安全，需要对该井上部井段进行承压堵漏作业，以提高其承压能力。在分析漏失情况和钻遇地层岩性的基础上，确定了易漏失层位。根据易漏失层位的岩性并借鉴前期堵漏经验，确定采用交联成膜与化学固结承压堵漏技术进行承压堵漏作业，即首先利用交联成膜堵漏浆初步提高地层的承压能力，再利用化学固结堵漏浆进一步提高地层的承压能力，以满足高压油气层安全钻进要求。明1井上部井段进行交联成膜与化学固结承压堵漏后，2 021.58 m以浅井段地层的承压能力提高到1.70 kg/L以上，2 021.58 m以深井段地层的承压能力高于1.60 kg/L，达到了承压要求，二开井段后续钻井过程中，承压堵漏井段未再发生漏失。实践表明，交联成膜与化学固结承压堵漏技术可大幅度提高易漏失地层的承压能力，为同类地层承压堵漏提供技术借鉴。Abstract: Since lost circulation occurred frequently in the 1 894.00-2 514.00 m interval in the second drilling section of the Well Ming-1,and the formation has a low pressure-bearing capacity,strengthening of plugging operations must be done for the upper interval to enhance its pressure-bearing capacity and to ensure safety while drilling of the remaining part of the second drilling section.Based on the the fact that the lithology contains weak layers and the prior experience of leak plugging,strengthening the plugging of cross-linked gel and chemical consolidation was adopted,in which a cross-linked gel plugging slurry was injected first to enhance the preliminary pressure-bearing capacity of the formation,then chemical consolidation slurry was applied to further enhance the pressure-bearing capacity of the formation to satisfy relevant requirements for safe drilling.After the plugging operation,the pressure-bearing capacity of the upper section shallower than 2 021.58 m of Well Ming-1 was increased to over 1.70 kg/L,whereas the deeper section was increased to over 1.60 kg/L,which satisfied the pertinent requirements,and no lost circulation took place in the plugged interval occurred and in the drilling of the rest interval.The results showed the cross-linked gel and chemical consolidation strengthened plugging operation could effectively enhance the pressure-bearing capacity of weak formations,which offered an effective means for strengthening the plugging operation in similar formations.
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Keywords:
- cross-linked gel /
- chemical consolidation /
- leakage zone /
- plugging /
- resispance pressure /
- Well Ming-1
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