Abstract

It is seen that gas wells if produced without planned rates may produce waterpre-maturely. Production of water basically loads the subject well bygenerating hydrostatic head within the well tubing. Secondly the waterproduction alters the in-situ gas saturation in near well bore region resultingchange in the relative permeability. Both these reasons make the subject wellproblematic due to decrease in well productivity and increase in the welloperating cost. Also the handling of produced water is uneconomical in manycases.

The work done for this study is general in nature, though the essence ofthis work comes from data collected from different gas wells having waterproduction problem. This study gives an overview of all the methods andtechniques, which can be used for, expel-out such problems and optimize gasproduction. Main stress has been given on Tubing Performance Curve study inorder to select best tubing size and calculation of the optimum rates againstselected tubing size. General tubing performance curve are also presentedshowing the behavior of the well before and after water production.

On the basis of study of different techniques related to the Gas wellproduction optimization and water production control we became, able to give asolution of interchanging the well tubing strings without purchasing any newstring pertaining to large gas fields where different tubing sizes are used indifferent wells.

Introduction

It is considered that wells producing dry gas have usually lower flowingbottom-hole pressure [1]. Liquid loading happens when the gas does not haveenough energy to carry the water out of the wellbore. Water accumulates at thebottom of the well, generating backpressure in the wellbore and blocking gasinflow [2]. For the optimization of the production of the gas it is necessaryto unload that water from the wellbore so that there should occur a decrease inthe backpressure of the static water column.

This content is only available via PDF.
You can access this article if you purchase or spend a download.