1. (50 pts.) WATER BREAK THROUGH

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REPORT
PROBLEM SET 8.

submitted to

Darkhan Kuralkhanov

13 of November 2019

Group members:

Nazym Gadylbekova

Dastan Shanay

Dilyara Shlatayeva

Rakhat Shaimerdenov

Irina Shtoda
Yalaletdinov Idris

Almaty 2019

1. (50 pts. ) WATER BREAK THROUGH

· (50 pts. ) Solve example 14-8 on page 913. Given: Oil formation volume factor – 1. 3bbl/STB, formation thickness – 100 ft, Cross sectional area – 45000ft, Porosity – 30%, Injection rate – 2500bbl/day, Distance between producer and injector – 2500ft, Residual oil saturation, Sor – 10%.

Calculate:

· Time to breakthrough

· Cumulative water injected at breakthrough

· Total pore volumes of water injected at breakthrough

Step 1. Calculate the reservoir pore volume:

Step 2. Calculate the time to breakthrough

Step 3. Determine cumulative water injected at breakthrough:

bbl

Step 4. Calculate total pore volumes of water injected at breakthrough

pore volumes

3. (50 pts. ) DYKSTRA PARSONS

· (50 pts. )Example 14-21(Page 999). Given: Layer #1 – 20ft and 50mD, #2 – 30ft and 150mD, #3 - 15ft and 300mD, #4 - 10ft and 80mD, #5 - 25ft and 50mD. Oil viscosity – 5cP, Water viscosity – 1cP, Bo-1. 3bbl/STB, ht – 100ft. The parameters that are not specified here should be taken from the example.

Layer	K., md	L, ft

Step 1.

Step 2

Step 3 . Calculate EV and WORs when water breakthrough occurs in the second layer, i. e., i = 2

Step 4. The required calculations can be performed more conveniently in the following worksheet:

Layer	, md	, ft		, STB/STB
1	300	15	0. 402	1. 278
2	150	30	0. 653	6. 329
3	80	10	0. 831	9. 34
4	50	25	1	23. 7
5	50	20	1	-

WOR

Glossary

Water break through- a description of reservoir conditions under which a fluid, previously isolated or separated from production, gains access to a producing wellbore.

Residual oil saturation- is the ratio of the immobile residual oil volume divided by the effective porosity.

Total pore volumes of water injected at breakthrough- is one of the factors for evaluating water flood effect in a water flood oil field.

-vertical sweep efficiency

- surface water/oil ratio(STB\STB)

1bbl=5. 615ft^3 because we calculate it in feet, but we need bbl.

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