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首页> 外文期刊>Journal of Petroleum Science & Engineering >Sampling with new focused, oval, and conventional probe-type formation-tester in the presence of water- and oil-base mud-filtrate invasion for vertical and high-angle wells
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Sampling with new focused, oval, and conventional probe-type formation-tester in the presence of water- and oil-base mud-filtrate invasion for vertical and high-angle wells

机译：在有水基和油基泥浆滤液侵入的情况下，使用新的聚焦椭圆形和常规探针型地层测试仪进行采样，以进行垂直和大角度钻井

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Speculation about the potential of developing new fluid and pressure sampling methods with probe-type formation testers has existed since the introduction of formation pressure testing while drilling technology was introduced to the industry nearly a decade ago. To replace the existing wireline technology, a new pumping system is required to remove invasion fluids and then to fill single-phase sample chambers. To make this commercially possible, several technology enhancements are necessary in advance. Although wireline pumpout tools may require hours to retrieve representative fluid samples, it is not a practical alternative to spend hours obtaining samples in the drilling environment. Most simulations of wireline formation-tester measurements assumed that invasion ended at the time when fluid pumpout began. Additionally, previous studies assumed a time-constant rate of invasion that was the time average of invasion rate. Both of these assumptions are optimistic for a drilling tool. The objective of this study is to quantify the viability of sampling in the drilling environment by way of numerical simulations. The study considers the dynamic nature of invasion while drilling when using both new and conventional probe configurations to retrieve fluid samples. With the realistic mudcake model, there are higher rates of invasion soon after drilling. Therefore, to simulate the invasion during drilling, a mudcake model is used that continues to grow in thickness and sealing effectiveness during invasion and throughout the sampling process. Simulation results focus on scenarios in which water-base mud (WBM) and oil-base mud (OBM) invade an oil-bearing zone. Furthermore, it studied the accuracy of functions used to estimate contamination in an OBM environment. The base model consists of a typical probe-type tool in a vertical well wherein fluid samples are retrieved using a time-constant flow rate. Invasion time is varied from 1 to 48 h to compare drilling and wireline sampling tools. Simulations of fluid cleanup times for a variety of rock types and wellbore deviation angles indicate that the oval focused probe retrieves the cleanest fluid sample in the least amount of time. This study also quantifies mudcake sealing effectiveness, as well as the effect of borehole deviation. Oval (elongated) and focusing guard-style probes are compared to standard probe configurations in various petrophysical rock types.
机译：自将近十年前在钻井技术引入井下压力测试以来，就一直存在使用探头式地层测试仪开发新的流体和压力采样方法的潜力的猜测。为了替代现有的电缆技术，需要一种新的泵送系统来清除侵入流体，然后填充单相样品室。为了使其在商业上可行，需要预先进行多项技术增强。尽管电缆抽出工具可能需要数小时才能获取代表性的流体样本，但在钻探环境中花费数小时来获取样本并不是可行的选择。电缆形成测试仪测量的大多数模拟都假定入侵是在流体抽出开始时结束的。此外，以前的研究假设入侵时间的恒定时间即入侵时间的平均时间。这两个假设对于钻井工具都是乐观的。这项研究的目的是通过数值模拟来量化采样在钻井环境中的可行性。该研究考虑了在使用新的和传统的探头配置来检索流体样本时随钻进侵的动态性质。使用现实的泥饼模型，钻探后不久会有更高的侵入率。因此，为了模拟钻井过程中的侵入，使用了泥饼模型，该模型在侵入过程中以及整个采样过程中厚度和密封效果持续增长。模拟结果集中于水基泥浆（WBM）和油基泥浆（OBM）侵入含油区的场景。此外，它还研究了用于估算OBM环境中污染的函数的准确性。基本模型由垂直井中的典型探针型工具组成，其中使用时间恒定的流量检索流体样本。入侵时间从1到48小时不等，以比较钻井和电缆采样工具。对各种岩石类型和井眼偏斜角的流体净化时间的模拟表明，椭圆形聚焦探头可在最短的时间内获取最清洁的流体样品。这项研究还量化了泥饼的密封效果以及井眼偏差的影响。将椭圆形（加长型）和聚焦防护式探头与各种岩石物理类型的标准探头配置进行了比较。

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