Solution to Well Control Risks in Complex Pipe Columns under Pressure in Gas Wells
With the continuous development of the main gas fields in our country.Some production wells in the production of scaling,corrosion perforation,downhole tool failure and other problems,it needs workover operation to replace production string to realize normal production.When workover fluid enters formation during routine workover,it will cause formation sensitivity,formation pore plugging and wettability change,which is unfavorable to further production of production wells.therefore,some oil and gas companies gradually introduce work-over operation with pressure,under the premise of no blowout,no well killing,effective protection of reservoir pressure,to promote the sustained and stable production of gas field.In the process of string lifting under pressure,the corresponding equipment and tools are used to control the annulus of the string and the pressure in the string,taking the construction process of three wells in sulige block by S-9 pressure equipment produced by SNUBCO in Canada as an example,this paper analyzes the well control problems existing in the complex string lifting under pressure,and puts forward the corresponding solutions,realize well control safety in the construction process.
snubbing operationcomplex stringwell control risksolution
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