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Xu X.,Petrochina | Xu X.,Xinjiang Petroleum College | Liu L.,Petrochina | Liu L.,Xinjiang Petroleum College | And 12 more authors.
Natural Gas Industry | Year: 2012

The gas pay zones in the Mahe Gas Field, Junggar Basin, have moderate porosity, medium to high permeability, high single-well production rate, and high pressure gradient. The corresponding recovery technology for such gas reservoirs are still under test and development. On the basis of the characteristics of the gas zones described above, the nodal analysis method is used to calculate and analyze the IPR curves, nodes, and other sensitive parameters of gas wells there. Then in combination with the calculation of the erosion flow rate and the offloading flow rate, the proper size and configuration of the production string can be determined. This study comes to the following conclusions, (1) the ID 62 mm tubing should be used if the single-well production allocation is less than 50 X 10 4 m 3/d; (2) the ID 76 mm + ID 62 mm tubing strings should be used if the individual well production is allocated to be 50 X 10 4- 110 X 10 4m 3/d; and (3) as for high pressure gas wells, the completion strings should be in such structure as tubing hanger + tubing + downhole safety valve + tubing + downhole pressure monitoring system + reverse-circulation killing valve + sealed plunger pipe + permanent packer + milling extension + shear ball seat + perforation gun.

Mei H.,Xinjiang Petroleum College | Yang H.,Xinjiang Petroleum College | Zhang K.,Xinjiang Petroleum College | Chang R.,Xinjiang Petroleum College
Drilling Fluid and Completion Fluid | Year: 2011

Problems of contradictory between performances stability and wellbore stability, and incompatible zeta potential between drilling fluid and formations are encountered in dispersive drilling fluid system. The experimental results show that the negative zeta potential of formation rocks are not high, and the cationic water base drilling fluid system can inhibit hydration and dispersion of mud shale stone, however, problems are found in incompatible between cationic agents and anionic agents. In this paper, the probabilities are analyzed that are changing from high negative zeta potential sodium bentonite to "zero potential" bentonite, changing from "anionic suspension" to "cationic suspension" of bentonite-water dispersion system, displacing anionic agents by cationic, nonionic and electrolyte agents, and preparing "zero potential" water base drilling fluid.

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