Separate-layer gas injection technology with concentric tubing for the Yaha high-pressure condensate gas reservoir, Tarim Basin

被引：0
|
作者：
Xue C. [1 ]
Ma H. [1 ]
Gao H. [1 ]
Zhang G. [1 ]
Chi M. [1 ]
机构：
[1] Engineering Technology Research Institute of PetroChina Xinjiang Oilfield Company, Karamay, 834000, Xinjiang
来源：
Natur. Gas Ind. | / 4卷 / 48-54期
关键词：
Concentric tubing; Safety; Separate layer gas injection; Tarim Basin; Tubing combination; Wellhead equipment; Yaha high-pressure condensate gas field;
D O I：
10.3787/j.issn.1000-0976.2016.04.007
中图分类号：
学科分类号：
摘要：
The Yaha high-pressure condensate gas field in the Tarim Basin has always been developed by maintaining the reservoir pressure through cyclic gas injection. The reservoir physical properties vary greatly between two major gas layers, and even in the same gas layer, so commingled gas injection not only leads to uneven reserves producing level, but also intensifies the production conflicts between high-permeability and low-permeability reservoirs. In this paper, separate-layer gas injection strings with concentric tubing were designed on the basis of gas well structures, the ground facility conditions and separate-layer gas injection requirements. Then, the corresponding wellhead equipments were supported. And in this way, a separate-layer gas injection well was completed and put into operation and the technical requirements of separate-layer gas injection were satisfied. And in addition, two combination modes of tubing were designed for concentric tubing programs, i.e., Ø114.3 mm + Ø73.0 mm and Ø114.3 mm + Ø60.3 mm. And both of them were theoretically analyzed and evaluated in terms of wellbore temperature and pressure fields and string safety at different allocations. It is shown that the required wellhead gas injection pressure is lower than 42 MPa when the maximum gas injection rate is up to 50×104 m3 and 20×104 m3/d respectively in the internal and external tubing of the former combination of Ø114.3 mm + Ø73.0 mm. And based on the existing ground gas injection facilities, the pressure can be reached with less gas injection pressure difference between the internal tubing and the external tubing, which is favorable for gas injection. The safety coefficient of this former tubing combination is higher than the common one (1.5). The first and second gas injection conditions were verified in terms of internal pressure strength and the third and fourth were verified in terms of external extrusion strength. It is demonstrated that this combination can meet the strength requirements. It is concluded that the tubing combination of Ø114.3 mm + Ø73.0 mm is feasible for separate-layer gas injection strings with concentric tubing. © 2016, Natural Gas Industry Journal Agency. All right reserved.
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页码：48 / 54
页数：6
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