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《Natural Gas Exploration and Development》 2017-01
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A new method for analyzing production performance of gas wells equipped with chokes

Xu Zhenping;Fan Jiwu;Sun Yanyan;Ge Jingtao;Li Zhichao;Sulige Gasfield Research Center,PetroChina Changqing Oilfield Company;National Engineering Laboratory of Low-permeability Oil & Gas Exploration and Development;Sinopec East China Company;  
The technology of d ownhole thr ottling is wide ly used in Ordos Basin in Sulige Gasfield, but it leads to difficulties in the conventional dynamic monitoring of gas fields and the performance analysis of gas wells. It is difficult to analyze the production performance of gas wells equipped with chokes by using the existing conventional methods. In this paper, the flowing theories of gas wells equipped with chokes and their characteristics of actual production curves were analyzed. It is indicated that in the gas wells equipped with chokes, obvious features of critical flow are presented at the early stage of its production and obvious features of subcritical flow are presented at the late stage. Then, the well test data of gas wells in different production stages was investigated systematically. It is newly understood that the well testing interpretation of gas wells equipped with chokes is mainly characterized by higher skin factor in the early critical flow while higher wellbore storage in the later subcritical flow. Accordingly, the method of "equivalent skin factor" was proposed to study the effects of chokes on gas wells in different production stages. Finally, the performance analysis method for gas wells equipped with chokes was developed, and the production performance of gas wells equipped with chokes was fitted by using TOPAZE software. It is indicated that this method is highly accurate and reliable, and it provides the new reference and technical support for the performance analysis of gas wells equipped with chokes.
【CateGory Index】: TE332
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