簡介：英國Fotech公司在一煤層氣田安裝首套用于監控產層數據的井下精確分布聲波光纖系統，用于獲取有用數據。該系統的兩大基本構件是低成本通信光纖和提供聲波變化信息的Helios問答器 。每隔一米光纖記錄一次地下聲波數據，也即意味著定位精度達到1米。

K-based Fotech Solutions has installed the world’s first dedicated downhole distributed acoustic optical-fiber system using its new Helios monitoring solution. In service for one month in a coalbed methane (CBM) well, the system has already provided valuable data on gas-flow profiles across the production intervals, the company says.

The system comprises two elements?a low-cost telecoms-grade optical-fiber cable and the Helios interrogator, which Fotech calls “the heart of the system.” Helios provides acoustic or vibration information along the entire length of the installed optical fiber to obtain multiple-event information, event characterization, and highly accurate event location.

An acoustic signal is recorded at each meter along the fiber, meaning that the system can detect and position an event to an accuracy of 1 m and can distinguish separate events more than 2 m apart. The fiber can be laid near a pipeline or installed in a borehole.

The system was installed in a CBM well in Scotland for Composite Energy of Stirling, UK in August 2009. In addition to downhole flow data, the system has also provided information on the condition of the downhole pump, the location of the water level, and vibrations at the wellhead.

Other potential benefits of the system for this application include:

• Locating and monitoring sand production
• Casing/tubing integrity
• Cross flow

The easily installed Helios system also has remote-control capability and can be deployed in a range of other oil and gas applications, including production monitoring, integrity assurance, flowline movement, flow assurance, and leak detection.

Don Sharples, technical manager, Composite Energy, said: “Initial results from the Fotech fiber are very encouraging. The technology collects data which is not available from other downhole sensors and will give Composite the ability to determine which coals are producing in any given well.”

Alan Piesse, cofounder and executive vice president of Fotech Services, said: “We see a strong future for the system in monitoring gas flow in CBM wells and other applications. For the first time, flow can be seen and heard entering and moving in the well and quantified in real time. We hope to continue monitoring Composite Energy’s CBM wells and look forward to a close working relationship with them.”

Further information can be obtained from the Fotech Solutions website.

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“新技術新產品”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 歡迎您提供手中的最新技術文章！