The multifunction evaluation system for coal-bed gas adsorption isothermal and pollution of drilling fluids is used for detecting the isothermal curves of adsorption and desorption needed in coal-bed gas exploration and development, at the same time, the system is used for studying the influences of external conditions applied on the coal bed such as reservoir temperature, moisture in the coal, the component of adsorbed gas, the drilling fluids and fracturing fluids on the coal beds, and pertaining to the technical area of the test instruments of coal-bed gas for drilling, exploration and development. Structure of the system is rational with advanced performance and high automation, its pressure and temperature are controlled by high precision sensors, and the microcomputer matched with the instrument has functions of rapid data acquisition, data process and chart plotting. This evaluation system can not only be used for detecting the isothermal curves of adsorption and desorption of single component gases, also can be used for detecting the isothermal curves of multi-component gases and deriving the diffusion coefficient of gas in the coal beds. Also the system can be used for evaluating the restoration value of the coal-bed desorption ability both before and after being polluted by drilling fluids and estimating the influence of drilling fluid and fracturing fluid, by which the shortcomings of unicity of adsorption and desorption test of coal bed gas, low automation level and low accuracy at present are eliminated, and it has the characteristics of clear flow-sheet, easy operation, modules of experiment software and standardization of experiment data.

Multifunction Evaluation System for Coal-Bed Gas Adsorption Isothermal and Pollution of Drilling Fluids

Supercritical carbon dioxide (SC-CO2) as a new drilling fluid had developed rapidly from the end of last century. The use of SC-CO2 drilling can not only obtain the low threshold pressure, high rate of penetration, and excellent hole cleaning capabilities, but also enhance oil recovery and protect reservoir effectively in the low-permeability reservoir. Thermodynamic and thermophysical properties of SC-CO2 were studied. Meanwhile, the present situation, advantages, and development direction of SC-CO2 drilling technology were analyzed. The results indicated that SC-CO2 drilling will bring an innovation in the drilling technology.

The Development and Prospect of Supercritical Carbon Dioxide Drilling

On the basis of analysis on the characteristics of CBM reservoirs, this paper further analyzes the damage mechanism on CBM reservoirs caused by drilling pressure and drilling fluid during the drilling process, and finally works out a conclusion on reservoir protection in aspects of drilling technology and drilling fluid. Abstract:Ultra-short radius radial horizontal wells technology is a new stimulation for oil development in recent years. It has got a good stimulation effect in old oil or gas wells, bad fractured wells, and near borehole damage wells. However, this technology has not been used widely due to some critical technologies' problems such as turning system, hydraulic rock-breaking bit, etc. In this paper, both pros and cons of the critical technologies of common radial horizontal wells technology are analyzed. Meanwhile, new progresses and advantages in CBM drilling of these critical technologies both home and abroad are also introduced in detail. Abstract: In order to reduce the cost in drilling, China United Coalbed Methane Corporation adopts slim hole drilling technology to drill parameter wells. In this paper, key parts of this technology are introduced, which includes selections of surface equipment, drill string, drilling parameter and drilling fluid, maintenance of drilling fluid, control measures of solid content, deviation prevention, coring technology, and logging technology. These techniques are successfully applied in the Qingshan project in Baotian, Guizhuo Province, which only cost less than half of what may cost in conventional oil and gas well drilling. According to the above discussion, a conclusion can be reached that slim hole drilling is feasible for the drilling of parameter well.

http://www.nios.com.cn/common/files/File/2008.03_English.pdf

Study on New Technologies of Ultra-short Radius Radial Horizontal Wells and Application in Coal-bed Methane Development

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Study on New Technologies of Ultra-short Radius Radial Horizontal Wells and Application in Coal-bed Methane Development