Abstract
In the workover treatment of Yakela condensate gas field, the workover fluids are easily leaked, and many problems such as clay expansion, rate sensitivity, migration of fines, and change of wetting property will occur, which will induce serious reservoir harms. In the article, the performances of the existing workover fluid of the Yakela condensate gas field with high temperature and high pressure are evaluated, and the influencing factors harming the reservoir are analyzed and obtained, and the effective measures and methods preventing the reservoir harm are confirmed. The technical principle, material composing, performance index, and the evaluation of stratum liquid compatibility are introduced in the article. The result of performance evaluation indicates that the core return permeability of the workover liquid system can achieve above 80%, and it is an ideal low-harm workover fluid system.
Highlights
In the workover treatment of Yakela condensate gas field, the workover fluids are leaked, and many problems such as clay expansion, rate sensitivity, migration of fines, and change of wetting property will occur, which will induce serious reservoir harms
Mechanism analysis of reservoir harm 1.1 Performance analysis of existing workover fluid At present, the workover fluid used in the Yakela condensate gas field mianly is the stratum water
To comprehensively analyze and study the performance of the existing workover fluid and completion fluid, the reservoir harm induced by the workover fluid and the completion fluid and the main harm mechanism can be scientifically diagnosed and analyzed
Summary
According to the survey of materials, the basic idea of developing the workover fluid of Yakela condensate gas field is to take the reservoir protection as the premise and fulfill the requirements of the workover works simultaneously, i.e. new workover fluid system should possess many characters such as good compatibility of stratum liquid, little corrosion and low stratum harm. At the same time, comparing with the existing workover fluid, the new workover fluid has many advantages such as good expansion resistance, small filtration loss, flowing-back, obvious reservoir protection, and high corrosion inhibition rate
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