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Due to the unique reservoir characteristics of the coalbed methane (CBM) in China, many technical... more Due to the unique reservoir characteristics of the coalbed methane (CBM) in China, many technical problems have to be studied and solved in the development of horizontal wells for CBM. In this paper, based on the V-type wells, we have summarized the many techniques involved in Drilling and completion of horizontal well for CBM in Binchang mining area, such as leakage protection and sealing, geosteering while drilling, remote connection, variable density cementing, Coal seam cavitation, fiberglass casing running into the well, and etc. It is pointed out that the air foam under-balance drilling will be the development direction for coalbed methane drilling technology.
Porosity is the fraction of the total volume of the rock that is pore (non rock) space or void an... more Porosity is the fraction of the total volume of the rock that is pore (non rock) space or void and not made of solid pieces of the formation. It will be filled with a gas, water or hydrocarbon or two or more at the same time. Porosity will range from a high of 40-50% in some marginally consolidated chalk formations to a low of near zero in some of the evaporites (anhydrite). The average porosity of producing reservoirs ranges from about 5-15% in limestones or dolomites, 10-25% in sandstones and over 30% in many of the chalk formations. In most unconsolidated formation, porosity depends upon the grain size distribution; not on the absolute size of the grain itself. Porosity can be in the order of 35-40% if all grains are close to the same size, but in most cases where a wide range of grain sizes are available, the porosity will be between 15-25%. Severe cases of formations with mixtures of large and very small grains may have porosities less than 15%.
HAL39774 1-2 Introduction
Well completion is the interface between the reservoir and surface production systems and is crit... more Well completion is the interface between the reservoir and surface production systems and is critical factor of the performance of the well. This can be varies from the simple to complex configuration depending by several factors like well construction, well depth lifting method of the fluids from the well, number of the perforated intervals produced separately or commingled, completion option at the formation level, flow rate of the well, available technology, location of the well etc. In this paper we present the trends in the well completion in accord with the complexity of the wells construction and the influence of the well completion to the well performance.
Due to the unique reservoir characteristics of the coalbed methane (CBM) in China, many technical... more Due to the unique reservoir characteristics of the coalbed methane (CBM) in China, many technical problems have to be studied and solved in the development of horizontal wells for CBM. In this paper, based on the V-type wells, we have summarized the many techniques involved in Drilling and completion of horizontal well for CBM in Binchang mining area, such as leakage protection and sealing, geosteering while drilling, remote connection, variable density cementing, Coal seam cavitation, fiberglass casing running into the well, and etc. It is pointed out that the air foam under-balance drilling will be the development direction for coalbed methane drilling technology.
Porosity is the fraction of the total volume of the rock that is pore (non rock) space or void an... more Porosity is the fraction of the total volume of the rock that is pore (non rock) space or void and not made of solid pieces of the formation. It will be filled with a gas, water or hydrocarbon or two or more at the same time. Porosity will range from a high of 40-50% in some marginally consolidated chalk formations to a low of near zero in some of the evaporites (anhydrite). The average porosity of producing reservoirs ranges from about 5-15% in limestones or dolomites, 10-25% in sandstones and over 30% in many of the chalk formations. In most unconsolidated formation, porosity depends upon the grain size distribution; not on the absolute size of the grain itself. Porosity can be in the order of 35-40% if all grains are close to the same size, but in most cases where a wide range of grain sizes are available, the porosity will be between 15-25%. Severe cases of formations with mixtures of large and very small grains may have porosities less than 15%.
HAL39774 1-2 Introduction
Well completion is the interface between the reservoir and surface production systems and is crit... more Well completion is the interface between the reservoir and surface production systems and is critical factor of the performance of the well. This can be varies from the simple to complex configuration depending by several factors like well construction, well depth lifting method of the fluids from the well, number of the perforated intervals produced separately or commingled, completion option at the formation level, flow rate of the well, available technology, location of the well etc. In this paper we present the trends in the well completion in accord with the complexity of the wells construction and the influence of the well completion to the well performance.