Research on Failure Characteristics of Natural Gas Downhole Throttle
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TECHNICAL ARTICLE—PEER-REVIEWED
Research on Failure Characteristics of Natural Gas Downhole Throttle Jie Zheng . Xin Yan . Yihua Dou
Submitted: 15 January 2020 Ó ASM International 2020
Abstract The downhole position of the throttle in natural gas well seriously affects the service life of the downhole throttle, and the incorrect down position will cause the downhole throttle cannot work. Therefore, it is important to study the optimal downhole depth of the throttle. The downhole throttle failure phenomenon of the natural gas well is serious in the Daning-Jixian region of China. The influence of downhole throttle depth on downhole throttle failure is analyzed in this area. By analyzing the mechanism of downhole throttling in the natural gas well and combining the coupling model of wellbore temperature and pressure, the optimal depth prediction model of downhole throttle is established. The comparison between the prediction results and the field construction results shows that: DJ 4-8 well 6, DJ 4-5 Well and DJ 4-10 well 2, the optimal throttle depths should be 1920 m, 1800 m, and 1950 m, respectively, but the actual depths on site are 2000 m, 1900 m, and 2200 m. There is a large deviation between the actual depths and optimal depths, causing the throttle to fail prematurely. According to this, obtaining the optimal downhole depth of the downhole throttle will ensure the working life of the downhole throttle and prevent the failure of the throttle. Keywords Downhole throttling Gas hydrate Failure analysis Optimal depth
J. Zheng (&) X. Yan Y. Dou School of Mechanical Engineering, Xi’an Shiyou University, Xi’an 710065, Shaanxi, People’s Republic of China e-mail: [email protected]
Introduction During the development of natural gas, in order to control the flow parameters of oil, gas, and water, vertical pipe flow, and horizontal or undulating pipe flow, so that the well could produce as expected, corresponding mechanical conditions must be applied, which conditions are: equipment from the production area to the wellbore, such as casing, tubing, packer, bottom hole nozzle. Among them, the bottom hole nozzle is the most important downhole controller for self-blowing wells [1]. Installing a downhole throttle above the well tubing can cause a pressure drop in the wellbore and regulate the use of formation energy in the lift pipe, and regulating the formation gas and liquid fluid production. Downhole throttle is an important downhole tool for controlling the stable production of gas wells. The failure of the throttle often causes gas hydrates to block the wellbore, fail to meet production requirements, and abnormal pressure at the wellhead. It can cause security threats to surface personnel and wellhead equipment at sometimes. Therefore, it is of practical significance to study the failure of downhole throttles. Downhole throttles widely used in oil and gas fields can be roughly divided into two types at present, which are fixed and movable. The downhole position of the fixed downhole throttle is determined by th
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