Same, but British. A farthing though.
关于我们
Successful and independent down-hole instrumentation specification, installation, stimulation, & surface data integration specialist. Successfully installed over 35 unique instrumented systems using creative and innovative techniques to deliver quality data under budget.
- 所属行业
- 石油天然气
- 规模
- 1 人
- 总部
- Chesapeake，Virginia
- 类型
- 自有
- 创立
- 2018
- 领域
- Downhole Instrumentation、Fibre Optic Systems、Engineering Design Specialist、Independent Consultant和Surface Integration
地点
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主要
获取路线
US，Virginia，Chesapeake，23321
动态
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Not all optical equipment has a hefty price tag. Visual Fault Locators - VFL - are an oft overlooked yet a really simple tool for inspecting fibre continuity if the fibre is accessible. It simply sends a visible light along the fibre and any dispersion is visible. Below is a simple demonstration of the tool in use. The 900-micron tight buffered single mode fibre is flexed to disperse light and then straightened to show restoration. The fibre was not broken but you can see significant dispersion.
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Marat Nukhaev wrote the piece to which I make comment. Please look him up. Great post
PhD in Petroleum engineering, expertise in sand control, horizontal well completion, ICD/AICD/AICV modeling, permanent well monitoring using DTS and DAS, chemical tracer inflow profiling
?? Monitoring of tubing leakage ? Today I wanted to tell you about another popular application of distributed temperature measurement systems – monitoring of tubing leakage ?and continuous monitoring of gas lift operations. ? ??When production wells in aggressive environments (presence of CO2 or H2S) or high erosion risks of downhole equipment (high flow rates and presence of sand particles), there is a risk of tubing leakage. This leads to inefficient operation of the tubing hoist as some fluid flows into the tubing. ? ??Gaslift wells also have a similar problem. When the unloading gas lift valves fail, they begin to pass gas from the annulus into the tubing during gas lift operation, thereby significantly reducing the efficiency of the gas lift method of oil production. ? The #DTS technology can be used to pinpoint the exact location of a leak (or to determine the failure of the unloading gas lift valves): ? 1?? The first method involves installing a fiber-optic cable outside the tubing and periodically conducting surveys using pressure testing down the tubing/casing to detect temperature anomalies. ? 2?? The second method is to conduct periodic surveys using slickline or wireline techniques. In this case, a special cable with optics and armor is used, which is run inside the tubing into the wellbore (I will tell you about this "tricky" cable later separately). #wellmonitoring
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Everything said here is, indeed, true though it is in the details where we find the challenge. Application of fibre is often not fully appreciated and thank you to Marat for posting this. Most common DTS units have a resolution of around 1m to 0.5m so location is fairly accurate provided the fibre length is corrected. This is not always an easy task. Challenges I have encountered are if the leak is either small or the flowrate through the breach low then it may not be detected - especially if the pinhole is on the other side of the casing/tubing/pipe. This can be for various reasons related to the configuration and fluids flowing in the line; even how intimate the cable is attached to the casing/tubing. Over the 40+ systems I have installed with fibre, in unconventional wells and offshore; complementary technologies have come along to enhance the value of fibre installations together with assisting in driving down costs. (Reducing cost and increasing value is a speciality of mine!!) Most often now DTS is accompanied with DAS - the acoustic side of fibre monitoring - which can be more sensitive and, more recently, strain measurements have become more popular which add finer resolution. Incremental cost for inclusion of additional fibres is relatively minor. My speciality is installing the systems successfully but there are many providers of these other technologies such as OptaSense, Neubrex Energy Services US and Silixa, in addition to most service companies, to name only a few, I am sure other people can also add their preferred vendors.
PhD in Petroleum engineering, expertise in sand control, horizontal well completion, ICD/AICD/AICV modeling, permanent well monitoring using DTS and DAS, chemical tracer inflow profiling
?? Monitoring of tubing leakage ? Today I wanted to tell you about another popular application of distributed temperature measurement systems – monitoring of tubing leakage ?and continuous monitoring of gas lift operations. ? ??When production wells in aggressive environments (presence of CO2 or H2S) or high erosion risks of downhole equipment (high flow rates and presence of sand particles), there is a risk of tubing leakage. This leads to inefficient operation of the tubing hoist as some fluid flows into the tubing. ? ??Gaslift wells also have a similar problem. When the unloading gas lift valves fail, they begin to pass gas from the annulus into the tubing during gas lift operation, thereby significantly reducing the efficiency of the gas lift method of oil production. ? The #DTS technology can be used to pinpoint the exact location of a leak (or to determine the failure of the unloading gas lift valves): ? 1?? The first method involves installing a fiber-optic cable outside the tubing and periodically conducting surveys using pressure testing down the tubing/casing to detect temperature anomalies. ? 2?? The second method is to conduct periodic surveys using slickline or wireline techniques. In this case, a special cable with optics and armor is used, which is run inside the tubing into the wellbore (I will tell you about this "tricky" cable later separately). #wellmonitoring
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