张雄, 余进, 毛俊, 刘祖磊. 准噶尔盆地玛东油田水平井高性能油基钻井液技术[J]. 石油钻探技术, 2020, 48(6): 21-27. DOI: 10.11911/syztjs.2020106
引用本文: 张雄, 余进, 毛俊, 刘祖磊. 准噶尔盆地玛东油田水平井高性能油基钻井液技术[J]. 石油钻探技术, 2020, 48(6): 21-27. DOI: 10.11911/syztjs.2020106
ZHANG Xiong, YU Jin, MAO Jun, LIU Zulei. High-Performance Oil-Based Drilling Fluid Technology for Horizontal Wells in the Madong Oilfield, Junggar Basin[J]. Petroleum Drilling Techniques, 2020, 48(6): 21-27. DOI: 10.11911/syztjs.2020106
Citation: ZHANG Xiong, YU Jin, MAO Jun, LIU Zulei. High-Performance Oil-Based Drilling Fluid Technology for Horizontal Wells in the Madong Oilfield, Junggar Basin[J]. Petroleum Drilling Techniques, 2020, 48(6): 21-27. DOI: 10.11911/syztjs.2020106

准噶尔盆地玛东油田水平井高性能油基钻井液技术

High-Performance Oil-Based Drilling Fluid Technology for Horizontal Wells in the Madong Oilfield, Junggar Basin

  • 摘要: 准噶尔盆地玛东油田水平井造斜段和水平段存在因泥岩水化、压力异常和砂砾层多而造成的起下钻阻卡、井眼失稳和机械钻速低等问题,为此开展了高性能油基钻井液技术研究。根据玛东油田的储层特征和中长水平段的钻进要求,配制了XZ高性能油基钻井液,并通过室内试验评价了其加重、抗高温、提切、封堵承压、抗污染和抗冻等性能。试验结果显示:该油基钻井液密度在1.35~2.01 kg/L时流变性能稳定、切力可调;热、冻稳定性好,低温可至–24 ℃,高温可达180 ℃;乳化稳定性好,破乳电压普遍在1 000 V以上;抗污染能力强,可抗20%钻屑、20%地层水和10%水泥的污染;封堵能力强,分别采用孔径为120和150 μm的砂盘进行承压封堵时,承压均可达15 MPa。该钻井液在玛东油田4口井进行了应用,钻井过程中井眼稳定,造斜段井径扩大率仅3.55%,起下钻顺利,平均机械钻速较同层位水基钻井液提高79%,取得了显著的提速效果。研究结果表明,采用XZ高性能油基钻井液可以解决玛东油田砂砾岩储层水平井钻井中存在的问题,满足该油田长水平段安全快速钻井需求。

     

    Abstract: The build-up section and horizontal section drilling in horizontal wells of the Madong Oilfield, Junggar Basin was challenged by problems such as pipe-string sticking during trip operations, wellbore instability, and low ROP caused by the hydration of mudstone, abnormal pressure, and an abundance of glutenites. Therefore, high-performance oil-based drilling fluid was accordingly investigated. Based on the reservoir characteristics of the Madong Oilfield and the drilling requirements of the medium-long horizontal sections, XZ high-performance oil-based drilling fluid was hereby formulated, and indoor laboratory experiments were carried out to evaluate its weighting, temperature resistance, shear strength improving, sealing/pressure-bearing, anti-pollution and anti-freezing performances. The results showed that this oil-based drilling fluid system exhibited stable rheological properties and an adjustable shear force between the density of 1.35–2.01 kg/L. The new fluid exhibited good thermal and freezing stability, low temperature resistance of up to –24 ℃, and high temperature resistance of up to 180 ℃. The emulsification stability was good, and the demulsification voltage was generally above 1 000 V. The anti-pollution ability was strong, the anti-cuttings pollution concentration was ≥20.0%, the anti-formation water pollution concentration was ≥20.0%, and the anti-cement pollution concentration was ≥10.0%. Further, the new drilling fluid system had strong sealing ability. When using sand discs with a diameter of 120 and 150 μm for pressure-bearing sealing, the pressure-resistance of both discs could reach 15 MPa. This system was applied in 4 of the wells in the Madong Oilfield. After the application of the new fluid, perfect borehole stability was achieved, the hole enlargement rate of the build-up section was only 3.55%, the trip operation was completed smoothly, and the average ROP was 79.0% higher than that of the same horizon drilled with water-based drilling fluid. A remarkable drilling speed-up effect was observed. The research results showed that the application of XZ high-performance oil-based drilling fluid can solve the technical problems in the development of the glutenite reservoirs in the Madong Oilfield and satisfy the needs of safe and fast drilling in the long horizontal section of this oilfield.

     

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