煤层气水平井井网井距排距一般多大？

yycrime

现在投入商业开发的煤层气水平井井网，井距排距一般多大，水平井现在长度一般多少？

cup2013

Well Spacing and Depth
The well density of a CBM field is often higher than a conventional natural gas field. One section (640 acres) typically contains eight CBM wells, compared to just one conventional gas well per 640 acres. However, spacing regulations are put forth by the Oil and Gas Commissions of the state and producers can petition the Commission if there is sufficient geologic and engineering evidence that warrants wells spacing deviate from the stated spacing rules. As a point of comparison, oil well spacing is generally one well per 40 acres in Wyoming.
Another notable difference between conventional natural gas wells and CBM wells are the depth at which they are completed. CBM production generally targets shallow coal seams; in the Powder River Basin of Wyoming, for instance, the depth of the coal seams vary within the basin, therefore the CBM well depths currently range from around 1000 feet to over 2000 feet. This is quite shallow compared to conventional natural gas wells that are found in the Jonah Gas Field in Wyoming, where well depths are 8000 to 12,000 feet. (source:Written and prepared by Joseph Michael Evers, University of Wyoming, Environment and Natural Resources)

cup2013

Typical spacing for U.S. CBM wells is one per 320, 160, or 80 acres. Closer spacing allows the wells to work together to reduce the area pressure, ensures optimum production and increases ultimate gas recovery.

yycrime

你也是石大的？

hdrgj

目前国内投入商业开发的直井井网井距一般300-350米，多分支水平井的分支间距一般150-300米，单支分支长度可以达到1000米。
其实，井距和分支间距并不是一个固定值，这个值得大少是根据一个煤层气区块地下煤层的地质特性来决定的，简单来说，主要是根据煤层的渗透率大小来确定的，即渗透率大，间距大，渗透率小，间距就小。