Wellhead Movement Analysis and Surface Casing Integrity in Pre-Salt Wells

F. Cutrim, C. O. Souza, Bruno Sergio Pimentel De Souza
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引用次数: 1

Abstract

As a general practice in the oil and gas industry, the well foundation, composed by the conductor and the surface casing, is designed with a strict tolerance regarding cement shortfall on the surface casing. However, in a pre-salt scenario, in order to reduce the costs of well construction, the surface casing shoe generally reaches the top of salt. In this case, it is quite hard to make the cement job reach the mudline due to problems like salt dissolution (generating high calipers) and presence of many geological faults in the post-salt zone (which can work as a lost circulation area). Besides that, an evaluation of the wellhead movement is necessary so that the structural restrictions of subsea equipment connected to the wellhead are not violated. This work had the goal of presenting a coupled structural model to analyze the foundation of a subsea well with a partially cemented surface casing, where the safety factors of surface casing are evaluated in the whole well life cycle along with the wellhead movement due to the loads related to each step of this cycle. A sensitivity analysis on the top of cement (measured from the casing shoe) is made, varying it from 300 m to 800 m. The results showed wellhead movement consistent with what is observed in the field, once no axial movement has been reported. Additionally, it was highlighted that the foundation design depends on the operations during the well construction and its future purpose, production or injection, because the thermal loads associated with operations have different impacts.
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盐下井井口运动分析与地面套管完整性
作为油气行业的一般做法,井的基础由套管和地面套管组成,对地面套管的水泥缺口有严格的公差设计。然而,在盐下情况下,为了降低建井成本,地面套管鞋通常到达盐层顶部。在这种情况下,由于盐溶解(产生高卡尺)和盐后带存在许多地质断层(可能成为漏失区)等问题,使得固井作业很难到达泥线。此外,有必要对井口运动进行评估,以确保不违反与井口相连的海底设备的结构限制。这项工作的目标是提出一个耦合结构模型,以分析具有部分胶结地面套管的海底井的基础,其中在整个井生命周期中评估地面套管的安全系数,以及井口由于与该周期的每个步骤相关的载荷而移动。对水泥顶部进行敏感性分析(从套管鞋开始测量),将其变化范围从300米到800米。结果表明,井口运动与现场观察到的一致,一旦没有轴向运动的报道。此外,该公司还强调,基础设计取决于建井期间的作业及其未来的用途,是生产还是注入,因为与作业相关的热载荷会产生不同的影响。
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