Liquid Loading in Gas Wells: Remedial Operations

Technology Review

nizam@petrosol.co

• Identifying liquid loading• Measuring impact of liquid loading• Finding right solution to unload liquids

Content

“As the velocity of the gas in the productionconduit drops with time, the velocity of theliquids carried by the gas declines even faster.The presence of more liquids accumulating inthe production conduit while the well isflowing can either slow production or stop gasproduction altogether”

James Lea et al. 2008

Identifying liquid loading

Well’s energy depreciation

Multiphase flow

Gas rate below critical value, cannot effectively contribute to transport

liquid to surface, resulting accumulation of downhole liquids!!

Predicting liquid loadingCritical velocity concept

Film reversal theory

Droplet reversal model

J curve method

Liquid loading in gas well Tubing and annulus pressure

Liquid loading in gas well No gas production

Liquid loading in gas well Fluctuation in productions

Liquid loading in gas well

Impairment of gas well

The impact depends: Liquids level in the wellbore Productivity index

The strategies to unload liquids

The strategies to unload liquids

Avoid downhole liquid phase

Venting (kick off) Equalizing (kick off) Cycling Velocity String Capillary String Plunger Lift

Utilizing the well’s energy

More efficient and economical to unload gas wells

Capillary string

Advantage of capillary string

Advantage of capillary string

Velocity string

Advantage of velocity string

Advantage of velocity string

Plunger lift

Plunger lift

Plunger lift

Add energy to well

Vortex ToolSucker Rod PumpESP

Vortex tool

“The path of least resistance for liquid and gas is determined to be of a helical trajectory……”

(G.R Mingaleeva)

Vortex tool

Advantage of vertex tool

Advantage of vertex tool

Comparison

Selection process for liquid unloading

Liquid unloading: Field glimpses

Thank Youfor assistance on your well

loading issue, reach us:

nizam@petrosol.co

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