The Innovative Integration of Wellbore Strengthening and Managed-Pressure Drilling Redraw the Line Between Undrillable and Drillable - Case Study from Offshore Mediterranean Deepwater

M. El-Husseiny, T. El-Fakharany, S. Khaled
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Abstract

Managed pressure drilling (MPD) has a reputation for enhancing drilling performance. However, in this study, we use it as a technology for making undrillable wells drillable. In the deepwater of the Mediterranean of Egypt, a gas field has been producing for few years. Water broke through in one well, thus, we must drill a new well to compensate for the reduction in production. Years of production led to pressure depletion, which makes it difficult to drill this well conventionally. In this study, we will discuss the combination of MPD and wellbore strengthening (WS). In addition, we will discuss the challenges we met while drilling and how we tackled them, and the best practices and recommendations for similar applications. The 12¼" × 13½" hole section passed depleted sands, followed by a pressure ramp. First, we drilled the depleted sands and confirmed the pressure ramp top. To strengthen the sand, we spotted a stress-cage pill of 645 bbls with a total concentration of 29 ppb. In addition, we conducted a formation integrity test (FIT), but its value was lower than the required value to drill to the section target depth (TD). Then, we switched to MPD and increased the mud weight. MPD in annular pressure control mode (AP) enabled us to walk the edge as near as possible to the impossible. Drilling this section was challenging due to the narrow mud weight window (MWW). We faced kick-loss cycles, where we had high-gas levels (from 20% to 55%) while drilling with a loss rate from 60 to 255 bph, at the same time. The 8½″ × 9½″ hole section will cover a depleted reservoir. Therefore, we decided to use the MPD to drill this section. To widen the MWW, we decided to stress-caging the hole, as we drill. We loaded the active-mud system with stress-cage materials totaling 39 ppb. We drilled the hole section while keeping the bottom hole pressure (BHP) at 14.6 ppg. We drilled using MPD by maintaining 525-psi surface back pressure (SBP). We used the SBP mode (semi-auto mode) to add connections, resulting in minor background gases and minor losses. This study discusses the application of a novel combination of MPD and WS. It emphasizes how MPD can integrate with other technologies to offer a practical solution to future drilling challenges in deepwater-drilling environments.
井筒强化和控压钻井的创新整合重新划定了不可钻和可钻之间的界限——地中海近海深水案例研究
控压钻井(MPD)以提高钻井性能而闻名。然而,在本研究中,我们将其作为一种使无法钻井的井变得可钻井的技术。在埃及地中海的深水区,一个气田已经生产了好几年。一口井出了水,因此,我们必须钻一口新井来弥补产量的减少。多年的生产导致压力枯竭,这使得常规钻井变得困难。在本研究中,我们将讨论MPD和井筒强化(WS)的结合。此外,我们还将讨论在钻井过程中遇到的挑战,以及如何解决这些挑战,以及针对类似应用的最佳实践和建议。12 1 / 4”× 13 1 / 2”的井段通过了枯竭的砂层,随后出现了一个压力斜坡。首先,我们钻探了枯竭的砂岩,并确认了压力坡顶。为了加固沙子,我们发现了一个645桶的应力笼丸,总浓度为29 ppb。此外,我们进行了地层完整性测试(FIT),但其值低于钻至目标深度(TD)所需的值。然后,我们切换到MPD,增加了泥浆比重。环空压力控制模式(AP)下的MPD使我们能够尽可能接近不可能的边缘。由于泥浆比重窗口(MWW)较窄,该段的钻井具有挑战性。我们面临着井涌-漏失周期,在钻井过程中,高含气量(从20%到55%),同时损失率从60到255 bph。8½″× 9½″井段将覆盖一个枯竭的油藏。因此,我们决定使用MPD钻井这一段。为了扩大MWW,我们决定在钻孔时对孔进行应力保持。我们向活性泥浆系统加载了总重量为39 ppb的应力保持器材料。我们在井底压力(BHP)保持在14.6 ppg的情况下钻进了这段井段。我们使用MPD钻井,保持了525psi的地面背压(SBP)。我们使用SBP模式(半自动模式)来添加连接,从而产生少量背景气体和较小的损耗。本研究探讨了一种新型MPD和WS组合的应用。它强调了MPD如何与其他技术相结合,为未来深水钻井环境中的钻井挑战提供实用的解决方案。
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