簡介：M-I SWACO壓力控制公司最近發布其最新的致密氣藏欠平衡鉆井作業中的氣藏描述動向。其碳追蹤氣體計量系統，能夠在欠平衡鉆井中，準確定位氣體產層。該系統主要針對復雜氣藏和貧瘠氣藏而設計，能夠準確測定低流速氣體（0.3m/s）。設備安裝在泥/氣分離器和火炬塔間的氣體管線上，計量低速率氣體的體積，從而準確判定氣藏質量。

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.

楊寶劍 是振威（全球）石油網的高級技術編輯，在石油技術資訊行業有八年的學識和經驗。他源源不斷地提供石油行業全球最新的技術創新、研發成果、現場應用情況等信息。如果你對該項新技術有任何的疑問，或者對“新技術新產品”未來的內容有任何問題或建議，請聯系楊寶劍編輯 +86 10-58236512 Email：allenyo@zhenweiexpo.com 歡迎與行業互動！