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沃什(Drunkards Wash)项目是在弗龙砂岩组煤层生产煤层气。该项目的开发面积508km~2,位于犹他州中东部圣拉斐尔隆起区西翼。生产的煤层气于1993年1月首次进入销售管线。目前,89口井(井间距0.64km~2)的产气量为124.5万m~3/d,平均每口井1.40万m~3/d。其中33口井已连续生产40个月,目前每口井的平均产气量为1.97万m~3/d。大多数井中,由于有水产生,储层压力下降,从而产气量增加。每天产出水为2805m~3/d,平均每口井为31m~3/d。煤层总厚度为1.2～14.4m,平均厚度为7.2m。在埋深360～1020m范围内,含煤3～6层。煤阶属高挥发B烟煤,平均镜质组反射率为0.69％。所有井均采用套管完井,并进行水力压裂和激励,大多数井需要抽水设备以控制产出水。但有27口井不需要抽水设备。弗龙组煤层中的平均含气量为12.5m~3/t,对于这种煤阶和埋深的煤层来说,其含气量比预测的高。煤层气同位素的研究揭示出该煤层气属热成气。同时,盆地埋藏较深的高阶煤中的热成气逆倾斜向上迁移至沃什区块尖灾地带。
The Drunkards Wash project produces CBM from the Fraser Sandstone Coal Seam. The development of the project covers an area of 508km ~ 2 and is located on the west wing of the up-and-coming San Rafael Utah Middle East. Production of CBM first entered the sales pipeline in January 1993. At present, the gas production of 89 wells (well spacing 0.64 km ~ 2) is 1,245,000 m 3 / d with an average of 14,000 m 3 / d per well. Among them, 33 wells have been continuously produced for 40 months. At present, the average gas production per well is 19,700 m 3 / d. In most wells, gas production is increased due to the pressure of reservoir pressure due to water production. The daily output of water is 2805m ~ 3 / d, the average per well is 31m ~ 3 / d. The total thickness of the coal seam is 1.2 ~ 14.4m with an average thickness of 7.2m. In the depth of 360 ~ 1020m range, coal 3 to 6 layers. Coal rank is high volatile B bituminous coal, the average vitrinite reflectance of 0.69%. All wells are cased and hydraulically fractured and motivated, and most wells require pumping equipment to control produced water. However, 27 wells do not require pumping equipment. The average gas content of the Fron Seam coal seam is 12.5m ~ 3 / t, which is higher than predicted for this coal rank and burial depth. Research on CBM isotopes revealed that the CBM is a hot gas. At the same time, the thermostated gas in the higher-grade coal buried deeper in the basin moved up-tilt to the tsunami-affected area.