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- Title
超深气井连续油管多径组合管柱作业新工艺.
- Authors
庞德新; 艾白布·阿不力米提; 焦文夫; 陈 波; 郭新维; 王一全; 白华明
- Abstract
As the exploration and development of deep and ultra deep oil and gas is increased, there are more and more "three-ultra wells" (reservoir temperature, reservoir pressure and well depth exceed 177 ℃, 105 MPa and 6 000 m, respectively), the completion well structure is more complex, and especially the inner diameter of production string is variable and the production string and production interval are blocked, which brings adverse impact on gas well production and even results in well shut down. To deal with this situation, it is necessary for the operation of coiled tubing in ultra deep gas wells to meet new requirements. In order to ensure the commissioning, stable production and production increase of "three-ultra wells", this paper researches and developes a technology for the multi-diameter combination operation of coiled tubing based on the advantages of casing tubing (including different dimensions, flexible movement of modularized equipment, high automation degree and snubbing), combined with the actual characteristics of "three-ultra wells" (such as geological conditions, borehole structure and fluid medium change). In addition, a support multi-diameter coiled tubing connection device was developed. And they have been successfully applied in Well XX 11 of PetroChina Tarim Oilfield Company. And the following research and practice results were obtained. First, by virtue of the multi-diameter combination operation of coiled tubing, the safety load factor of the string is increased effectively by 0.12. Second, the friction along the string is reduced effectively, with a friction reduction rate of 41.7%. Third, under the same pressure, the end effect is increased by 33% by increasing the construction displacement. Fourth, the cuttings return capacity is enhanced. In conclusion, this technology meets the requirements of the variable-diameter wellbore operation in ultra deep gas wells and provides a new safe, efficient and low-cost solution for the operation of coiled tubing in ultra deep gas wells.
- Subjects
GAS wells; GAS condensate reservoirs; WATER temperature; SAFETY factor in engineering; TUBES; PRODUCTION increases
- Publication
Natural Gas Industry, 2021, Vol 41, Issue 3, p112
- ISSN
1000-0976
- Publication type
Article
- DOI
10.3787/j.issn.1000-0976.2021.03.013