Development unit division and favorable area evaluation for joint mining coalbed methane

CBM resource in Huhehu depression Hailar Basin is large. Damoguai formaiton is the most favorable exploration coalbed methane target layer for top depth of 500-1200m, big coal seam thickness, low seam mineral content and high vitrinite by drilling, seismic and experimental data. Then cover character is evaluated and distribution is predicted. By analogy other low-level the CBM reservoir control factors, the south of depression is the most favorable area of CBM exploration for bigger coal thickness and better sealing conditions.

Download Full-text

Evaluation of Favorable Area in the Weibei Coalbed Methane Field: a Study by Using Grey Correlation Analysis

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.295-298.3342 ◽

2013 ◽

Vol 295-298 ◽

pp. 3342-3345 ◽

Cited By ~ 5

Author(s):

Ying Li ◽

Da Meng Liu ◽

Yan Bin Yao ◽

Xiao Hong Wang ◽

Zhao Wei Yin

Keyword(s):

Correlation Analysis ◽

Coal Seam ◽

Coalbed Methane ◽

Methane Concentration ◽

Gas Content ◽

Reservoir Pressure ◽

Grey Correlation ◽

Gas Saturation ◽

Grey Correlation Analysis ◽

Favorable Area

Based on the gas analysis results of coalbed methane (CBM) wells in the Weibei CBM field, two main recoverable target seams (Nos. 5 and 11) were evaluated for the potential of exploration and exploitation by using the grey correlation analysis method. The main influnce factors on the CBM potential by increasing importance are gas content, gas saturation, buried depth, methane concentration, critical desorption pressure,reservoir pressure and coal thickness for the No.5 coal seam; while they are gas saturation, gas content, critical desorption pressure, methane concentration, buried depth, reservoir pressure and coal thickness for the No.11 coal seam. The exploration potential of No.5 coal seam is better than that of No.11. The favorable area for CBM exploration are the areas including Well block W2, W3, W4 and W8 in the middle of Weibei CBM field.

Download Full-text

Coalbed methane

AccessScience ◽

10.1036/1097-8542.757500 ◽

2015 ◽

Keyword(s):

Coalbed Methane

Download Full-text

2011 BEEF FORAGE SURVEY RESULTS

EDIS ◽

10.32473/edis-ag410-2016 ◽

2016 ◽

Vol 2016 (7) ◽

Author(s):

Sonja C. Crawford ◽

Christa L. Kirby ◽

Tycee Prevatt ◽

Brent A. Sellers ◽

Maria L. Silveira ◽

...

Keyword(s):

Program Evaluation ◽

Organizational Development ◽

Management Practices ◽

South Florida ◽

University Of Florida ◽

Development Unit ◽

Survey Results ◽

County Extension ◽

Ranch Management ◽

The University

The University of Florida / IFAS South Florida Beef Forage Program (SFBFP) is composed of county Extension faculty and state specialists. The members, in conjunction with the UF/IFAS Program Evaluation and Organizational Development unit, created a survey in 1982, which is used to evaluate ranch management practices. The survey is updated and distributed every 5 years to ranchers in 14 South Florida counties: Charlotte, Collier, DeSoto, Glades, Hardee, Hendry, Highlands, Hillsborough, Lee, Manatee, Martin, Okeechobee, Polk, and Sarasota. The responses are anonymous.

Download Full-text

Split Estate and Wyoming’s Orphaned Well Crisis: The Case of Coalbed Methane Reclamation in the Powder River Basin, Wyoming

Case Studies in the Environment ◽

10.1525/cse.2017.000455 ◽

2017 ◽

Vol 1 (1) ◽

pp. 1-8 ◽

Cited By ~ 3

Author(s):

Kathryn Bills Walsh

Keyword(s):

Natural Gas ◽

River Basin ◽

Technological Innovation ◽

Coalbed Methane ◽

Powder River Basin ◽

Gas Wells ◽

Mineral Rights ◽

Split Estate ◽

Legal Condition

This case presents the stakeholder conflicts that emerge during the development and subsequent reclamation of abandoned natural gas wells in Wyoming where split estate, or the separation of surface land and mineral rights from one another, occurs. From 1998 to 2008, the Powder River Basin of northeastern Wyoming experienced an energy boom as a result of technological innovation that enabled the extraction of coalbed methane (CBM). The boom resulted in over 16,000 wells being drilled in this 20,000 square-mile region in a single decade. As of May 2017, 4,149 natural gas wells now sit orphaned in Wyoming as a result of industry bankruptcy and abandonment. The current orphaned wells crisis was partially enabled by the patchwork of surface and mineral ownership in Wyoming that is a result of a legal condition referred to as split estate. As the CBM boom unfolded in this landscape and then began to wane, challenges emerged most notably surrounding stalled reclamation activities. This case illuminates these challenges highlighting two instances when split estate contributed to issues between landowners and industry operators which escalated to litigation.

Download Full-text

The Influences of the Rank of Coal on Methane Sorption Capacity in Coals/Wpływ Rzędu Węgla Na Pojemność Sorpcyjną Metanu W Węglach

Archives of Mining Sciences ◽

10.2478/amsc-2014-0037 ◽

2014 ◽

Vol 59 (2) ◽

pp. 509-516

Author(s):

Andrzej Olajossy

Keyword(s):

Sorption Capacity ◽

Coalbed Methane ◽

Vitrinite Reflectance ◽

Sorption Isotherms ◽

Volatile Matter ◽

Low Rank ◽

Hard Coal ◽

Petrographic Composition ◽

Methane Sorption ◽

Indian Coals

Abstract Methane sorption capacity is of significance in the issues of coalbed methane (CBM) and depends on various parameters, including mainly, on rank of coal and the maceral content in coals. However, in some of the World coals basins the influences of those parameters on methane sorption capacity is various and sometimes complicated. Usually the rank of coal is expressed by its vitrinite reflectance Ro. Moreover, in coals for which there is a high correlation between vitrinite reflectance and volatile matter Vdaf the rank of coal may also be represented by Vdaf. The influence of the rank of coal on methane sorption capacity for Polish coals is not well understood, hence the examination in the presented paper was undertaken. For the purpose of analysis there were chosen fourteen samples of hard coal originating from the Upper Silesian Basin and Lower Silesian Basin. The scope of the sorption capacity is: 15-42 cm3/g and the scope of vitrinite reflectance: 0,6-2,2%. Majority of those coals were of low rank, high volatile matter (HV), some were of middle rank, middle volatile matter (MV) and among them there was a small number of high rank, low volatile matter (LV) coals. The analysis was conducted on the basis of available from the literature results of research of petrographic composition and methane sorption isotherms. Some of those samples were in the form (shape) of grains and others - as cut out plates of coal. The high pressure isotherms previously obtained in the cited studies were analyzed here for the purpose of establishing their sorption capacity on the basis of Langmuire equation. As a result of this paper, it turned out that for low rank, HV coals the Langmuire volume VL slightly decreases with the increase of rank, reaching its minimum for the middle rank (MV) coal and then increases with the rise of the rank (LV). From the graphic illustrations presented with respect to this relation follows the similarity to the Indian coals and partially to the Australian coals.

Download Full-text