Accumulation Process and Phenomena in Chamber Lift Completions
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Accumulation Process and Phenomena in Chamber Lift Completions. Sergio Caicedo. ASME/API Gas-Lift Workshop Houston, Texas, Spring 2002. OUTLINE Introduction Two-packer Chamber Equations Insert Chamber Equations Algorithm Results Conclusions Recommendations. INTRODUCTION.

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Accumulation Process and Phenomena in Chamber Lift Completions

Sergio Caicedo

ASME/API Gas-Lift Workshop

Houston, Texas, Spring 2002


  • OUTLINE Completions

  • Introduction

  • Two-packer Chamber Equations

  • Insert Chamber Equations

  • Algorithm

  • Results

  • Conclusions

  • Recommendations


INTRODUCTION Completions

Chamber Lift Application Window

Particularly suitable for wells with very low reservoir pressure, high productivity

Chamber Lift Design Goal

Accumulate more liquid volume per bottom hole flowing pressure

Chamber Lift Main Problem

Formation Gas in the chamber


INTRODUCTION Completions

  • Production Cycle

  • Accumulation Stage

  • Liquid Accumulation In Annulus and Tubing

  • Formation Gas Accumulation in Annulus

  • Described by Gas and Liquid balance coupled with

  • Reservoir inflow

  • Chamber Displacement

  • Slug Lifting

  • Venting


TWO-PACKER CHAMBER EQUATIONS Completions

TWO-PACKER CHAMBER COMPLETION


P Completionstop

Yperf

Operating

Valve

mgout

Bleeding

Valve

Panu

Ypinf

Ytop

Yanu

amgres

Standing

Valve

TWO-PACKER CHAMBER EQUATIONS

Gas Balance in the annulus

Liquid Balance

Pressure relationship


P Completionstop

Yperf

Operating

Valve

mgout

Bleeding

Valve

Panu

Ypinf

Ytop

Yanu

amgres

Standing

Valve

TWO-PACKER CHAMBER EQUATIONS

2x2 System of Non Linear

Differential equations !!!


P Completionstop

Yperf

Operating

Valve

mgout

Bleeding

Valve

Panu

Ypinf

Ytop

Yanu

amgres

Standing

Valve

TWO-PACKER CHAMBER EQUATIONS

Reservoir Inflow

Bottom Hole Flowing Pressure

Gas rate through the Bleeding Valve


INSERT CHAMBER EQUATIONS Completions

INSERT CHAMBER COMPLETION


P Completionstop

Yperf

Operating

Valve

m1gout

Bleeding

Valves

Panu1

m2gout

Panu2

Ypinf

Ytop

Yanu1

a2mgres

Yanu2

a1(1-a2)mgres

Standing

Valve

INSERT CHAMBER EQUATIONS

Gas Balance in the external annulus

Gas Balance in the internal annulus

Liquid Balance


P Completionstop

Yperf

Operating

Valve

m1gout

Bleeding

Valves

Panu1

m2gout

Panu2

Ypinf

Ytop

Yanu1

a2mgres

Yanu2

a1(1-a2)mgres

Standing

Valve

INSERT CHAMBER EQUATIONS

Gas rate through the Bleeding Valves


ALGORITHM Completions


INITIAL AND BOUNDARY CONDITIONS Completions

The key to simulate the accumulation process in both cases is to introduce the proper initial conditions and suitable boundary or limit conditions.

For instance, the initial level in the annulus is zero because all the liquid has been displaced during the previous injection stage, meanwhile the initial liquid level depends on the fall back of the slug in the previous production cycle.

Among the limit conditions, the limit when the liquid level in the annulus approaches zero requires special care in order to keep the system consistent.


Annular & Tubing Liquid Levels vs. Accumulation Time Completions

Column (ft)

Accumulation Time (s)

RESULTS

--Annulus

-- Tubing

Liquid Levels vs. Time for a 100-feet two-packer chamber with a 3/16" bleeding port and 10% of gas coming into the annulus


RESULTS Completions

Annular & Tubing Liquid Levels vs. Accumulation Time

--Annulus

-- Tubing

Column (ft)

Accumulation Time (s)

Liquid Levels vs. Time for a 100-feet two-packer chamber with a 1/32” bleeding port and 10% of gas coming into the annulus.


Annular & Tubing Liquid Levels vs. Accumulation Time

Column (ft)

Accumulation Time (s)

RESULTS

--Annulus

-- Tubing

. Liquid Levels vs. Time for a 100-feet two-packer chamber with a 3/16” bleeding port and 50% of gas coming into the annulus.


RESULTS

Annular & Tubing Liquid Levels vs. Accumulation Time

--Annulus1

-- Annulus2

-- Tubing

Column (ft)

Accumulation Time (s)

Liquid Levels vs. Time for a 200-feet Insert Chamber with a 3/16” internal and external bleeding ports.


RESULTS

Annular & Tubing Liquid Levels vs. Accumulation Time

--Annulus1

-- Annulus2

-- Tubing

Column (ft)

Accumulation Time (s)

  • Liquid Levels vs. Time for a 200-feet Insert Chamber with a 3/16” internal and a 1” external bleeding ports


Annular & Tubing Liquid Levels vs. Accumulation Time

Column (ft)

Accumulation Time (s)

RESULTS

--Annulus1

-- Annulus2

-- Tubing

Liquid Levels vs. Time for a 200-feet Insert Chamber with 1" internal and external bleeding ports


P top

Yperf

Operating

Valve

m1gout

Bleeding

Valves

Panu1

Panu2

m2gout

Ypinf

Ytop

a2mgres

Yanu1

Yanu2

a1(1-a2)mgres

Standing

Valve

RESULTS

Insert Chamber Improvement


Annular & Tubing Liquid Levels vs. Accumulation Time

Column (ft)

Accumulation Time (s)

RESULTS

--Annulus1

-- Annulus2

-- Tubing

Liquid Levels vs. Time for a 200-feet Insert Chamber with a 3/16" internal and a 1/2" external bleeding ports


CONCLUSIONS

The complexity of the accumulation process in chamber lift requires the previous analysis for a better sizing of the bleeding valves.

The coherence and physical behavior of the results along with the field experiences backups the theoretical model and the numerical method.

The slight differences between the two-packer and insert chambers completions do not allow applying the same practices in both installations.


RECOMMENDATIONS

In insert chamber completions it is highly recommended to connect directly the external annulus with the tubing whether it is possible.

Apply the model developed in this paper when designing or simulating wells with two-packer or insert chamber lift installations.

Start a research work in order to determine the gas percentages of separation that flow into the annulus and tubing in chamber lift installations in order to include that key information in the presented model.


QUESTIONS ???

FEEL FREE PLEASE



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