Key Technology for Horizontal Well of Extended Reach Drilling in the Shallow Reservoirs of the Dongfang Gas Field
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摘要:
南海西部东方气田浅部储层大位移水平井钻进过程中存在浅层泥岩段易出泥球、目的层疏松易发生井漏导致储层伤害、技术套管下入摩阻大和固井压力安全窗口窄导致漏失与气窜双重风险等难题。结合前期区域钻井作业经验，通过优化钻井液技术方案并复配具有针对性的处理剂，解决了浅层泥岩段岩屑成球的难题，提高了储层保护效果；使用漂浮接箍技术，确保技术套管顺利下入；通过优化浆柱结构及水泥浆配方，并采取提高套管居中度等技术措施，提高了固井质量，最终形成了东方气田浅部储层大位移水平井钻井关键技术。该技术在东方气田浅部储层大位移水平井钻井施工过程中应用效果较好，DF-AH井钻井过程中浅层泥岩段无泥球生成，目的层无井漏发生，技术套管下入顺利，完井清喷产能较设计提高约50%。东方气田浅部储层大位移水平井钻井关键技术为该气田的高效开发提供了技术支持。
Abstract:While drilling horizontal wells having extended reach in the shallow reservoirs of Dongfang Gas Field in the Western South China Sea, challenges were encountered. They included balling-proneness in the shallow mudstone interval, lost circulation induced reservoir damage in the unconsolidated target layer, large frictional drag in RIH technical casing and narrow cementing pressure safety window. These factors contributed to the dual-risk of lost circulation and gas channeling. Combining with the previous regional operation experiences and optimizing the drilling fluid technical solution and compounding the pertinent additives, the first problem of debris balling in the shallow mudstone interval was solved, improved reservoir protection effect. Using floating coupling technology ensured smooth RIH of technical casing. After optimizing the mud column structure, the new cementing formula and casing centralization improved cementing quality. Key technologies for horizontal well of extended reach drilling in the shallow reservoirs of Dongfang Gas Field were developed. These technologies have achieved a good application effect during drilling the horizontal wells of extended reach in the shallow reservoirs of Dongfang Gas Field. No mud ball was formed during the shallow mudstone interval drilling of well DF-AH, and no lost circulation occurred in the target layer. The technical casing RIH was finished smoothly, and the completion/cleanup productivity was about 50% higher than the designed. Those key technologies have provided technical supports for the efficient development of gas fields.
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图 2 悬重与套管漂浮长度关系曲线
Figure 2. Relationship between hanging weight and casing floating length
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