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Technology and Applications of Foam Drilling Fluid in Fractured and Complex Formations

机译：裂缝性和复杂地层中的泡沫钻井液技术及应用

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摘要

Fractured and complex formations where types of fractured and porous mud loss occurred in commonly induced instability ofwellbore and drilling accidents such as borehole collapse and blowout; therefore, it is the technological bottleneck for the development of oil and gas. Solid free recyclable foam drilling fluid was developed and aimed to deal with the MIS oilfield of Iran, which has abnormally low pressure and developed fracture-cave hydrocarbon reservoir with a high concentration of H_2S, which has problems such as serious lost circulation and H_2S risk. A sectionalized drilling fluid system has been adopted in this oilfield, and drilling with water can meet the operation requirements during first spud and saturated salt polymer system or undersaturated salt polymer in second spud; the horizontal section adopts solid free recyclable foam drilling fluid to achieve near balance drilling and effectively solves the lost circulation problem in fractured limestone formation. The spot application indicates that solid free recyclable foam drilling fluid has excellent rheology, and meets the requirement of drilling engineering. Meanwhile, the system can retard the H_2S corrosion effect on drillstring and guarantee to provide a good MWD transmission signal. A new idea has been provided for drilling engineering in fractured and complex formations.
机译：裂缝和复杂的地层，在通常引起的井眼失稳和钻井事故（例如井壁坍塌和井喷）中，发生了裂缝性和多孔性泥浆流失的类型;因此，这是石油和天然气发展的技术瓶颈。开发了无固体可回收泡沫钻井液，旨在应对伊朗低压异常，MIS油田开发，高浓度H_2S裂隙烃油藏，存在严重的漏失和H_2S风险等问题。该油田采用分段钻井液体系，水钻可以满足第一桩和饱和盐聚合物体系或第二桩中不饱和盐聚合物的作业要求。水平段采用不含固体的可回收泡沫钻井液，实现近平衡钻井，有效解决了石灰岩裂缝形成中的漏失问题。现场应用表明，不含固体的可回收泡沫钻井液具有良好的流变性，可以满足钻井工程的要求。同时，该系统可以缓和H_2S对钻柱的腐蚀作用，并保证提供良好的MWD传输信号。已经为裂缝和复杂地层中的钻井工程提供了新思路。

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