Deborah Production Assignment 2 to Summit

8/20/2019 Deborah Production Assignment 2 to Summit

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COURSE

Production Engineering 1

COURSE CODE

PROD 3001

LECTURER

Indar Narace

STUDENT

Deborah Ramnath

ID #

65115

ASSIGNMENT # 2

DUE DATE

19-10-15


2/12

WELL COMPLETION DESIGN PROBLEM (6 marks)

i) Required to determine using the appropriate two-phase flow graph to the flowing

bottomhole pressure (Pwf ) for the following test conditions:

Given;

Well head Pressure – 100 psig

Tubing size – 2 inch nominal

Oil API Gravity – 34o API

Gas specific gravity – 0.66

Surface Flowing Temperature – 100 oF

Flowing Bottomhole Temperature – 190oF

Oil Flow Rate – 498 bopd

Water Flow Rate – 495 bwpd

Static BHP (Pr) – 2500 psig

GOR – 501 SCF/bbl

Well Depth – 6005 feet

Solution;

Converting GOR TO GLR

4 4+4 250 Add 600ft for 100psi wellhead pressure

Well depth: 6005 feet + 600 feet =6605 feet

From pressure transverse curve Pwf = 1720 psig


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From pressure transverse curve, Pwf = 1720 psig


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ii) IRP graph drawn based on values obtained below.

1 0 . 2 0.8

qo max =qo

−.

−.

qo max =

−.−. /

Sample Calculation

Using a Pwf = 500 & qomax = 2067 (from above)

10.2 Pwf

Pr0.8(Pwf

Pr)

2067 1 0.2 5002500 0.8(500

2500) 1918 STB/day

Pwf , psi Q o (STB/day)

0 2067

500 1918

1000 1637

1500 1224

2000 678

2500 0


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0

678

1224

1637

1918

2067

0

500

1000

1500

2000

2500

0 500 1000 1500 2000 2500 3000

P w f ( p s i )

Qo (STB/day)

Pwf vs Qo


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iii) Required to draw an IPR (Vogel) graph for this well if a well test resulted in a skin

factor of 1.2

Using S= 1.2 to calculate FE

+ +. 0.85

mx @ = 1.8FE 1 Pwf Pr 0 . 8FE 1 Pwf Pr

500 2067[1.80.85 1 0 . 80.85 1

] =1765 STB/day

Pwf , psi Q o (STB/day)

0 1968

500 1765

1000 1467

1500 1073

2000 585

2500 0


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0

500

1000

1500

2000

2500

3000

0 500 1000 1500 2000 2500

P w f ( p s i )

Qo (STB/day)

Pwf vs Qo

Pwf

Qo (skin = 1.2)

Q o (no skin)


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iv) Using the appropriate graphs;

For 1000


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For 1500


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For 2000

IPR graph draw for a skin of 1.2

Pwf (psig) Q (STB/day)

1500 1000

1640 1500

1720 2000


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Figure 1; Graphs of, i. Well Flowing Pressure (Pwf) Vs. Flow Rate (Q), ii. Graph of Well Flowing

Pressure (Pwf) Vs. Flow Rate (Q) with skin of 1.2 and iv. Tubing performance curve for 2.5 inch

nominal tubing using flow rates of 1000, 1500 and 2000 bopd.


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v) As indicated by the above graph, the 2.5 inch tubing will yield a flow rate of 1200

STB/day.

vi) The 2.5 inch tubing in the damaged well will produce 1100 STB/day as shown in the

graph above.

Deborah Production Assignment 2 to Summit

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