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System and method for intermittent gas lift

A gas lift, gas technology, applied in the field of systems and methods for intermittent gas lift, to achieve the effect of eliminating hydrostatic barriers and increasing gas flow rate

Inactive Publication Date: 2012-05-23
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gas flow up the annulus is tolerated in shallow low-pressure gas applications; however, problems such as high pressure, hydrogen sulfide deposits, sulfur deposits, paraffin deposits, and local conditioning may prevent flow up the annulus

Method used

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  • System and method for intermittent gas lift
  • System and method for intermittent gas lift
  • System and method for intermittent gas lift

Examples

Experimental program
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Effect test

Embodiment Construction

[0022] now refer to Figure 3-5 , a system 100 according to a preferred embodiment of the present invention is positioned in a wellbore 12 . The system 100 includes a production string 114 and an inner string 116 . The inner tubing string 116 preferably but need not include coiled tubing. At the surface, production valve 124 controls the flow of fluid out of production string 114 , and lift gas inlet valve 126 and lift gas outlet valve 128 control fluid flow into and out of inner tubing string 116 , respectively. Lift gas is preferably supplied to lift gas inlet valve 126 via a high pressure lift gas supply line (not shown). Packer 115 is preferably positioned at the bottom of production string 114, thereby isolating the portion of the annulus above that point.

[0023] The system preferably includes a transition device 130, which is preferably located several thousand feet from the bottom of the wellbore. Below the transition device 130, a concentric outer string 118 surro...

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PUM

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Abstract

A gas-lift apparatus and method for use in a well in which liquids accumulate in a liquid zone. The apparatus comprises a first string extending into the liquid zone and having upper and lower ends; a second string surrounding the first string and defining an annulus therewith, the second string extending a distance from the first string lower end such that the annulus has upper and lower ends, the annulus being closed at its upper and lower ends and defining a chamber, the chamber being in fluid communication with the inside of the first string; a check valve controlling the flow of liquid into from the wellbore into the lower end of said annulus; a gas valve allowing the flow of gas from the first string into the upper end of the chamber; and a valve for controlling the flow of gas into the upper end of said inner string.

Description

[0001] related case [0002] This application claims priority to US Patent Application Serial No. 61 / 221,169, filed June 29, 2009, which is incorporated herein by reference. technical field [0003] The present invention relates to a system and apparatus for removing water from deep gas wells. Background technique [0004] Hydrocarbon gases from a subterranean formation are initially produced by the intrinsic formation pressure of the gas in the formation. However, over time, water vapor in the gas stream condenses on its way to the ground. As production rates drop, velocity can no longer lift fluid to the surface. The water droplets coalesce, flow down the tubular, and collect at the bottom of the wellbore. Finally, the fluid level rises above the well perforation level. This increases the bottom wellbore flowing pressure and limits production. When this occurs, it is advantageous to remove the liquid from the well in order to increase the gas flow rate. [0005] Poss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00E21B43/12E21B34/06
CPCE21B43/122E21B43/13
Inventor J·R·布鲁尔
Owner SHELL INT RES MAATSCHAPPIJ BV