最大允许环空表面压力(MAASP)标准计算研究;实地案例研究

A. Yasutra, G. R. Darmawan, Muhammad Rafki
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摘要

油井完整性故障可能发生在油田油井的生产阶段。这些故障可能会产生持续套管压力(SCP),这种压力在井口是可测量的,无法排出。SCP必须小心处理,以避免任何不受控制的流体流到其他地层或地表。为了保持SCP值不降低其他屏障的完整性,应已知并保持井内每个环空的压力阈值。最大压力阈值称为最大允许环空表面压力(MAASP)。本案例研究将使用API RP90-2和ISO 16530-1中概述的三种已知方法计算X油田三口井的MAASP。API RP 90-2定义了计算MAASP(称为MAASP——最大允许井口工作压力)的两种方法,即简单减额法(SDM)和显式减额方法(EDM)。然后对结果进行比较和评估,以了解每种方法的MAASP的差异和趋势,并创建一个经验法则的MAASP/深度的泛化。对于环空,使用API RP90-2 SDM和EDM方法获得的MAASP总是大于使用ISO 16530-1方法获得的。然而,对于B环空,使用API RP 90-2 SDM方法获得的MAASP变化,有时大于或小于ISO 16530-1方法。在C环空时,使用API RP 90-2 SDM和EDM方法获得的MAASP始终小于ISO 16530-1方法。MAASP/深度概括将针对MAASP ISO 16530-1进行介绍。
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Maximum Allowable Annular Surface Pressure (MAASP) Standards Calculations Study; a Field Case Study
Well integrity failures may arise during the production phase of a well in a field. Those failures could create a Sustained Casing Pressure (SCP), a pressure that is measurable at the wellhead that can not be bled-off. SCP has to be addressed carefully to avoid any uncontrolled fluid flow to other formation or to surface. To maintain SCP value from degrading the other barrier integrity, the pressure threshold should be known and maintained for each annulus in a well. The maximum pressure threshold known as Maximum Allowable Annular Surface Pressure (MAASP). This case study will calculate MAASP from three wells in X field using three known method as outlined in API RP90-2 and ISO 16530-1. API RP 90-2 define two methods in calculation MAASP (known as MAASP – Maximum Allowavle Wellhead Operating Pressure), Simple Derating Method (SDM) and Explicit Derating Method (EDM). The result then compared and evaluted to know the differences, trend of MAASP for each methods, and create a generalization of MAASP/depth for field rule of thumb. For A annulus, the MAASP obtained using  API RP90-2  SDM and  EDM method is always greater than that obtained using the ISO  16530-1 method. However, for B annulus, the MAASP   obtained using the API RP 90-2 SDM method varies, occasionally being greater or less than the ISO 16530-1 method. While in C annulus, the MAASP obtained using the API RP 90-2 SDM and EDM methods is always less than the ISO 16530-1 method. The MAASP/depth generalization will be presented for MAASP ISO 16530-1.
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