PetroChina plans multistage fracs for Changqing tight gas

By OGJ editors
HOUSTON, June 8
-- PetroChina Co. Ltd. plans to use multistage fracturing to produce the tight gas sands in its Changqing field in the Ordos basin, according to Baker Hughes Inc.

Baker Hughes said that it will supply PetroChina with 77 Frac-Point multistage openhole frac-completion systems for the horizontal wells in the field, similar to the systems successfully used last year in Sulige gas field, also in the Ordos basin.

Baker Hughes characterizes Changqing as having low permeability, low pressure, and low-yield sands that require multistage fracs to effectively produce. The company notes that it will provide Frac-Point systems for three fourths of PetroChina's 102-well horizontal drilling program.

The Frac-Point system uses short-radius, openhole packers, and frac sleeves to isolate intervals of a horizontal section and pinpoint frac placement. The one-trip system allows the frac treatment for each section to be pumped on the same day, eliminating the expense of mobilizing and demobilizing pumping equipment, according to Baker Hughes.

The company notes the system improves overall production by providing greater control of the fracs along the entire length of the horizontal lateral.

China's Peoples Daily online reported that 2009 production from Changqing had reached 30.06 million tonnes by Dec. 19, making the field China's second largest oil-gas field after Daqing oil field.

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