Содержание
- 2. GAS LIFT Purpose Gas is injected down the well and the gas bubbles reduce the density
- 3. Gas lift is a method of artificial lift that uses an external source of high-pressure gas
- 4. CONTINUOUS-FLOW GAS LIFT The vast majority of gas lift wells are produced by continuous flow, which
- 5. Continuous-flow gas lift is recommended for high-volume and high-static BHP wells in which major pumping problems
- 6. ADVANTAGES OF CONTINUOUS GAS LIFT Gas lift is the best artificial lift method for handling sand
- 7. DISADVANTAGES OF CONTINUOUS GAS LIFT Relatively high backpressure may seriously restrict production in continuous gas lift.
- 8. INTERMITTENT-FLOW GAS LIFT As the name implies, intermittent flow is the periodic displacement of liquid from
- 9. The intermittent gas-lift method typically is used on wells that produce low volumes of fluid (approximately
- 10. ADVANTAGES INTERMITTENT GAS LIFT Intermittent gas lift has many of the same advantages/disadvantages as continuous-flow gas
- 11. DISADVANTAGES INTERMITTENT GAS LIFT Intermittent gas lift is limited to low volume wells. The average producing
- 12. GAS LIFT There are two main components of the gas lift system that are put inside
- 13. GAS LIFT SYSTEM LIMITATIONS Needs High-Pressure Gas Well or Compressor One Well Leases May Be Uneconomical
- 14. GAS LIFT SYSTEM APPLICATION CONSIDERATIONS OperatingDepth5,000 -10,000’ TVD15,000’ TVD OperatingVolume100 -10,000 BPD30,000 BPD Wellbore 0-50° 70°Deviation
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Слайд 2GAS LIFT
Purpose
Gas is injected down the well and the gas bubbles reduce
GAS LIFT
Purpose
Gas is injected down the well and the gas bubbles reduce
![GAS LIFT Purpose Gas is injected down the well and the gas](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/1080950/slide-1.jpg)
Unload water from gas wells
Wire line retrievable
Excellent handling of sandy conditions
Minimal moving parts
Offshore applications
Слайд 3 Gas lift is a method of artificial lift that uses an external source
Gas lift is a method of artificial lift that uses an external source
![Gas lift is a method of artificial lift that uses an external](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/1080950/slide-2.jpg)
Continuous-flow gas lift
Intermittent-flow gas lift
Слайд 4CONTINUOUS-FLOW GAS LIFT
The vast majority of gas lift wells are produced by
CONTINUOUS-FLOW GAS LIFT
The vast majority of gas lift wells are produced by
![CONTINUOUS-FLOW GAS LIFT The vast majority of gas lift wells are produced](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/1080950/slide-3.jpg)
In continuous-flow gas lift, the formation gas is supplemented with additional high-pressure gas from an outside source. Gas is injected continuously into the production conduit at a maximum depth that depends upon the injection-gas pressure and well depth. The injection gas mixes with the produced well fluid and decreases the density and, subsequently, the flowing pressure gradient of the mixture from the point of gas injection to the surface. The decreased flowing pressure gradient reduces the flowing bottomhole pressure below the static bottomhole pressure thereby creating a pressure differential that allows the fluid to flow into the wellbore.
Слайд 5 Continuous-flow gas lift is recommended for high-volume and high-static BHP wells in
Continuous-flow gas lift is recommended for high-volume and high-static BHP wells in
![Continuous-flow gas lift is recommended for high-volume and high-static BHP wells in](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/1080950/slide-4.jpg)
Слайд 6ADVANTAGES OF CONTINUOUS GAS LIFT
Gas lift is the best artificial lift method
ADVANTAGES OF CONTINUOUS GAS LIFT
Gas lift is the best artificial lift method
![ADVANTAGES OF CONTINUOUS GAS LIFT Gas lift is the best artificial lift](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/1080950/slide-5.jpg)
Deviated or crooked holes can be lifted easily with gas lift. This is especially important for offshore platform wells that are usually drilled directionally.
Gas lift permits the concurrent use of wireline equipment, and such downhole equipment is easily and economically serviced.
The normal gas-lift design leaves the tubing fully open. This permits the use of BHP surveys, sand sounding and bailing, production logging, cutting, paraffin, etc.
High-formation GORs are very helpful for gas-lift systems but hinder other artificial lift systems.
Gas lift is flexible. A wide range of volumes and lift depths can be achieved with essentially the same well equipment.
A central gas-lift system easily can be used to service many wells or operate an entire field.
A gas-lift system is not obtrusive; it has a low profile. The surface well equipment is the same as for flowing wells except for injection-gas metering.
Well subsurface equipment is relatively inexpensive. Also, major well workovers occur infrequently.
Installation of gas lift is compatible with subsurface safety valves and other surface equipment.
Слайд 7DISADVANTAGES OF CONTINUOUS GAS LIFT
Relatively high backpressure may seriously restrict production in
DISADVANTAGES OF CONTINUOUS GAS LIFT
Relatively high backpressure may seriously restrict production in
![DISADVANTAGES OF CONTINUOUS GAS LIFT Relatively high backpressure may seriously restrict production](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/1080950/slide-6.jpg)
Gas lift is relatively inefficient, often resulting in large capital investments and high energy-operating costs..
Adequate gas supply is needed throughout life of project. If the field runs out of gas, or if gas becomes too expensive, it may be necessary to switch to another artificial lift method. In addition, there must be enough gas for easy startups.
Operation and maintenance of compressors can be expensive
There is increased difficulty when lifting low gravity (less than 15°API) crude because of greater friction, gas fingering, and liquid fallback.
Слайд 8INTERMITTENT-FLOW GAS LIFT
As the name implies, intermittent flow is the periodic displacement
INTERMITTENT-FLOW GAS LIFT
As the name implies, intermittent flow is the periodic displacement
![INTERMITTENT-FLOW GAS LIFT As the name implies, intermittent flow is the periodic](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/1080950/slide-7.jpg)
Слайд 9 The intermittent gas-lift method typically is used on wells that produce low
The intermittent gas-lift method typically is used on wells that produce low
![The intermittent gas-lift method typically is used on wells that produce low volumes of fluid (approximately](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/1080950/slide-8.jpg)
Слайд 10ADVANTAGES INTERMITTENT GAS LIFT
Intermittent gas lift has many of the same
ADVANTAGES INTERMITTENT GAS LIFT
Intermittent gas lift has many of the same
![ADVANTAGES INTERMITTENT GAS LIFT Intermittent gas lift has many of the same](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/1080950/slide-9.jpg)
Intermittent gas lift typically has a significantly lower producing BHP than continuous gas-lift methods.
It has the ability to handle low volumes of fluid with relatively low production BHPs.
Слайд 11DISADVANTAGES INTERMITTENT GAS LIFT
Intermittent gas lift is limited to low volume
DISADVANTAGES INTERMITTENT GAS LIFT
Intermittent gas lift is limited to low volume
![DISADVANTAGES INTERMITTENT GAS LIFT Intermittent gas lift is limited to low volume](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/1080950/slide-10.jpg)
The average producing pressure of a conventional intermittent lift system is still relatively high when compared with rod pumping; however, the producing BHP can be reduced by use of chambers. Chambers are particularly suited to high PI, low BHP wells.
The power efficiency is low. Typically, more gas is used per barrel of produced fluid than with constant flow gas lift. Also, the fallback of a fraction of liquid slugs being lifted by gas flow increases with depth and water cut, making the lift system even more inefficient.
Fluctuations in rate and BHP can be detrimental to wells with sand control. The produced sand may plug the tubing or standing valve. Also, pressure fluctuations in surface facilities cause gas- and fluid-handling problems.
Intermittent gas lift typically requires frequent adjustments.
Слайд 12GAS LIFT
There are two main components of the gas lift system that
GAS LIFT
There are two main components of the gas lift system that
![GAS LIFT There are two main components of the gas lift system](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/1080950/slide-11.jpg)
Madrel
Valve
Слайд 13GAS LIFT SYSTEM LIMITATIONS
Needs High-Pressure Gas Well or Compressor
One Well Leases May
GAS LIFT SYSTEM LIMITATIONS
Needs High-Pressure Gas Well or Compressor
One Well Leases May
![GAS LIFT SYSTEM LIMITATIONS Needs High-Pressure Gas Well or Compressor One Well](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/1080950/slide-12.jpg)
Fluid Viscosity
Bottom hole Pressure
High Back-Pressure
Слайд 14
GAS LIFT SYSTEM APPLICATION
CONSIDERATIONS
OperatingDepth5,000 -10,000’ TVD15,000’ TVD
OperatingVolume100 -10,000 BPD30,000 BPD
Wellbore 0-50°
GAS LIFT SYSTEM APPLICATION
CONSIDERATIONS
OperatingDepth5,000 -10,000’ TVD15,000’ TVD
OperatingVolume100 -10,000 BPD30,000 BPD
Wellbore 0-50°
![GAS LIFT SYSTEM APPLICATION CONSIDERATIONS OperatingDepth5,000 -10,000’ TVD15,000’ TVD OperatingVolume100 -10,000 BPD30,000](/_ipx/f_webp&q_80&fit_contain&s_1440x1080/imagesDir/jpg/1080950/slide-13.jpg)
Corrosion Handling is Good to Excellent with Upgraded Materials
Gas Handling
Gravity Best in >15° API
Servicing : Wireline or Work over Rig
Prime Mover Type: Compressor
Offshore Application: Excellent System
Efficiency10% -30%