Analysis Of Wellbore Liquid Loading In Condensate Gas Well With Water Production

This paper is taken gas condensate field of Xinjiang as the study object.Based on the collection of production report and sorting of relevant test data of Dixi14,17and18block, in Kelameili gas field, from2009to2013, this paper completed the following work:During the mid and later stage of condensate reservoir development, it usually occurs that the condensate oil and water flew from the formation into the wellbore.If the gas has not sufficient energy to lift the liquid to the surface, the liquid loading will occur in the wellbore. The liquid accumulation would increase the backpressure, and then reduced the gas well productivity, even killed the well completely. Therefore, studying the laws of liquid loading in condensate reservoir is significant for the diagnose of liquid loading, proper design of operating parameters and even the whole development of gas reservoir.(1) Analyzing the fluid producing properties of condensate wells in Kelameili gas field, in Xinjiang oilfield. This field is a volcanic gas reservoir, having multiple gas-water system with gas above water. And the gas-water distribution covers three types:edge water, bottom water and irregular gas water; and the produced water chiefly comes from condensate water, interbedded water and edge-bottom water. All these three types of produced water exist in each block.(2) Dividing the condensate water-gas ratio of3blocks in Kelameili gas field, the ratio of Dixi14,17and18block varies from0.026to0.285m3/104m3,0.057to0.227m3/104m3and0.045to0.223m3/104m3, respectively.(3) Performing the liquid loading diagnosis according to the production data and making an estimation of liquid loading in condensate gas well in Kelameili gas field by analyzing the flow decline curve of gas well, observing the variation of tubing and casing pressures and pressure curve test.(4) The physical property parameter of condensate well is presented by the use of flash calculation tor, which is applied to compute the mixing density. Based on this, the bottom of the well is the reference point of continuous flowing,the Turner model、 Coleman model and Li Min model are analyzed. Comparing the theoretical critical liquid-carrying rate with the actual ones in different models,this paper shows that the Turner model is more suitable for the practical manufacturing situation in Kelameili gas field.(5) This paper analyses the calculating models of wellbore pressure in Kelameili gas field, for which judged condensate wells with accumulated fluid in bottom hole. The single-phase flow simulation calculation model is used to calculate bottom hole flowing pressure directly, and calculate the effusion height by the method of effusion differential pressure,for which gas-liquid ratio is more than1400m3/m3in effusion wells.