Establishment and Application of Mathematical Model of Gas-liquid Miscible Drilling Sand Flushing for Coiled Tubing in Low Pressure Natural Gas Horizontal Wells
The original pressure coefficient of Upper Paleozoic gas reservoir in the northern part of East Sulige Gas Field is low,and with the increase of production degree,the formation pressure coefficient can be lower than 0.4.Because the fractured horizontal wells in this area have strict requirements for reservoir protection and process safety in the process of wellbore sediment cleaning,conventional sand flushing and sand clearing have limitations.Based on the research results of Boyun Guo and Ali Ghalambor,four mathematical models of bottom-hole flow pressure,solid phase carrying capacity,pump pressure and wellhead flow rate are established.Based on the calcu-lation and prediction results of the mathematical model,from 2023 to 2024,the continuous tubing gas-liquid mis-cible drilling and sand flushing were tested and applied in Sulige gas field for 6 times,and the gas production in-crease per well exceeded 25×103 m3/d.The data playback results of electronic manometer about well Ⅳ show that the measured bottom-hole flow pressure is consistent with the theoretical calculation results,which confirms the accuracy and reliability of the core model.This study provides a new method for plugging removal and stimulation of similar wells.
万方数据
维普
