简介：M-I SWACO压力控制公司最近发布其最新的致密气藏欠平衡钻井作业中的气藏描述动向。其碳追踪气体计量系统，能够在欠平衡钻井中，准确定位气体产层。该系统主要针对复杂气藏和贫瘠气藏而设计，能够准确测定低流速气体（0.3m/s）。设备安装在泥/气分离器和火炬塔间的气体管线上，计量低速率气体的体积，从而准确判定气藏质量。

The Pressure Control Group of M-I SWACO recently announced its newest development in reservoir characterization for tight-gas, underbalanced-drilling (UBD) operations. The CarbonTracker gas metering system promises operators improved ability to locate productive zones while drilling in an underbalanced condition.

The new system was developed in response to an industry need for a better understanding of reservoir characteristics, particularly for fields with complex or low-quality reservoirs. Traditional reservoir characterization techniques have often been inconclusive, the company states, because most gas meters designed for drilling operations are unable to reliably detect the trace amount of gas normally produced during tight-gas formation drilling.

The CarbonTracker meter, by contrast, is accurate to flow velocities as low as 1 ft/sec (0.3 m/s), making it ideally suited for tight-gas reservoirs. Installed in the flare line between the mud/gas separator and flare stack, the meter measures gas-flow velocity, temperature, and pressure to determine actual and standard volumetric flow, in addition to mass flow rates.

The meter employs ultrasonic sensors which utilize the principle of Doppler shift for velocity measurements. An average velocity is calculated, which the meter then multiplies by the physical dimensions of the flow cell to determine a volumetric flow rate.  Molecular weight and mass flow rate can also be calculated, using the pressure and temperature measurements obtained from the meter.

The meter can be used on any rig, onshore or off, and because it has no moving parts, can tolerate dirty or wet conditions without creating obstructions in the flare line. The meter includes a flow cell that is installed in the flare line, a flow computer with integrated wellsite-information transfer-specification (WITS) translator, and a protective housing.

MI-SWACO states that this new meter gives operators the ability to conclusively locate productive gas zones while in a UBD mode without having to rely solely on log data to predict production and make drilling decisions. The CarbonTracker promises operators a lower cost technology that improves the accuracy and cost-effectiveness of their decisions, in real time.

Contact M-I SWACO’s Pressure Control Group for more information.

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