试气求产制度快速确定方法

Method for quickly determining production system during gas testing

为改变现场试气节流油嘴及孔板尺寸的选择基本依靠施工设计及测气经验获得的现状,提出了试气求产制度优、快实用的确定方法。根据天然气能量方程式和天然气性质,推导出元坝探区及焦石探区油嘴与井口油压、气产量的关系式;以达西流动和最大理论产量为基础,应用节点分析技术,确定序列求产油嘴及孔板尺寸方法。实践表明,该方法现场应用适用率98%,油嘴尺寸一次选择适用率100%,更换孔板操作最多3次,可确保施工顺利进行。试气求产制度快速确定方法提高了现场资料录取质量,有效控制并降低了测气期间可能产生的施工风险。

During gas testing on site,the selections of throttling nozzle and orifice plate size basically depend on operation design and gas testing experience.In this paper,an optimal,fast,and practical method for determining production system during gas testing was proposed.According to the energy equation and properties of natural gas,the relationships between nozzles and wellhead tubing pressure/gas production in the Yuanba and Jiaoshi exploration areas were derived.Based on the Darcy flow and the maximum theoretical production,the production nozzle and the orifice plate size were determined sequentially by applying node analysis technology.Practices have shown that the applicability rate of this method is 98%on-site,the applicability rate of the nozzle size for one-time selection is 100%,and the operation of replacing the orifice plate is at most 3 times,which can ensure a smooth operation progress.The method for quickly determining production system during gas testing improves the quality of on-site data acquisition,and effectively controls and reduces the operation risks that may occur during the gas testing.