Reservoir Protection in Drilling Through Gas-Bearing Glutinite Formations in the Junggar Basin
详细信息
- 责任者：Rong Kesheng (Exploration & Development Research Institute of Xinjiang Oilfield Company ; PetroChina ; Karamay 834000 ; China) ; Li Jianguo
- 刊名：Natural Gas Industry
- 出版年：2012
- 卷期：32(2)
- 关键词：储层保护 ; reservoir protection ; 完井液 ; completion fluid ; 钻井液 ; drilling fluid
- 页码：p.63-66
- 图表：illus., 3 tables, 12 refs.
- 分类号：2000
- issnNo：ISSN1000-0976
- isbnNo：CN51-1179/TE
摘要
The shielding type temporary plugging is often combined with anti-water-locking additives to protect natural gas reservoirs.While the bridging particles and the deformable packing particles used at Dixi,Shinan,and Mobei gas fields are rather coarse,large in size,only a small amount of fine grains can be imbedded into the reservoir wellbore,resulting in poor plugging effects.Hence a study is made to analyze the lithology and physical properties of the reservoir formations in this area,then in combination with research results about the gas zone protection techniques and the main factors of damage to gas zones,to decide the proper bridging particles,deformable particles and particle grading suitable for the target pay zones in the Xinjiang Oilfield.And based on the study made on the wettability,spontaneous imbibition,and water locking damage and control in the gas reservoir formations,4 anti-water-locking cleanup additives are developed for drilling fluid systems to be used in this area.The additives have higher surface activity,of reducing the surface tension of fresh water to 22 mN/m and that of the drilling/completion fluid filtrate to be under 35 mN/m.The combination of the above techniques achieves good results from the application in the 7 wells like Di 204,Di 205,Di 206,etc.in the Dixi-12 well-block area,and the core permeability recovery ratios tested after being contaminated all exceed 80%.
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