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Petroleum Refinery Operations

5. A well is being drilled at 7,500 ft. A sudden increase in pit volume is observed. In the 3 minutes it takes to notice the increase and close the BOP's, 18 barrels of mud are "gained". The original mud density was 10.4Ibm/gal and circulation was 370 gpm. After stabilization, a drill pipe pressure of 200 psig and a casing pressure of 300 psig were observed. This is a11" hole with 19.5#, 5" OD drill pipe and 9x4" drill collars (300ft).

Calculate the kick density.

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Petroleum Refinery Operations

4. Say we have a 6000 ft well 13 inches in diameter and we lower 10.75 inch casing into the well at 3 fps. The fluid is1215cp mud. What will the pressure at the bottom of ppg the well be when all 6000 feet of casing are in the well.Assume the casing is floated in...(be sure to include the static head as well as surge)= closed at the bottom.

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Petroleum Refinery Operations

3. We have cuttings composed of.11 cm diameter spheres of quartz (sp gr = 2.6) in the mud described in problem 1.

a. What is the slip velocity?

b. If we want a transport ratio of 0.53, what is the circulation rate in gpm if the hole is 13 7/8 inches in diameter?

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Petroleum Refinery Operations

2. We need to calculate the clay required to make up mud.Assume a mud volume of 200 BBL. A high yield clay (33BBL/ton) will be used.

a. How many 100 lbm. "sacks" of clay are required?

What is the mud density before weighting?

Calculate the pressure at the bottom of the well.C.

d.How 200 lbm. "sacks" of barite are required to many raise the density by 0.25 ppg?

b. How much water is needed?

e.Calculate the pressure at the bottom of the well.

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Petroleum Refinery Operations

1. We are using an 12 lb/gal mud with Fann VG readings of22 at 300 rpm and 34 at 600 rpm. We have 6000 ft of 4.26inch inside diameter 5 inch outside diameter drill pipe. The pump outlet pressure is rated to a maximum of 3000 psia and the well is 6000 ft deep.

if the mud was designed for "balance" when not circulating, what is the reservoir pressure?a.

b. What are K and n?n

c. What are Hpand t, ?Hp

d. The bit has 3 nozzles 15/32 in diameter,

i. What is the pressure drop across the bit if we circulate at 500 gpm?

ii. What would the frictional pressure drop through drill pipe be?

iii. What would the frictional pressure drop through the annulus be?

iv. So what would the pump pressure be, and does this pose a problem?

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