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Answers drilling questions

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Q2.a)

c)

BarinasLa Luna2 ; 42.4 ; 2.7 ; 2.8710 ; 40 ; 59 ; 92(i) La Luna

Barinas

(ii) La Luna

Barinas

(iii)

For La Luna: from the graph at = 2.7 and PET = 4; = 5%

For Barinas: from the graph at = 2.4 and PET = 2; = 18%

(iv) For La Luna: from the graph at = 2.7 and PET = 4; Lithology: Limestone/Dolomite

For Barinas: from the graph at = 2.4 and PET = 2; Lithology: Sandstone

Q3.c)(i)

(ii)

Q4.a)

b)From the table at density of 1438 kgm-3: buoyancy factor = 0.8172

Drilling 2009/10Q3.a)

c)

10 ; 48 ; 69 ; 90

4900 5010 feet

5200 5250 feet

Q4.a)

6.4 ; 13.7 ; 44Water ()

High Clay13.786.3

Low Clay4456

c)(i)

(ii)

(iii)

(iv)

Q5.b)(i)

(ii)

(iii)

(iv)

Q6.(i) Pressure drop in drill pipe

Pressure drop in drill collars

Pressure drop across bit

Assuming Cd = 0.95;

Pressure drop in drill collar annulus

Assuming DHole = 8.5 in, 100 = 20 and 3 = 5;

Pressure drop in drill pipe annulus

Total pressure lost in the system

(ii)

(iii)

(iv)

Q7.b)(i)Depth (ft)ROP (ft/hr)RPMWOB (1000 lb)MW (ppg)ddc

7500125120389.51.231781.23178

780066110389.61.399411.38484

800037110379.81.562611.51478

820042110339.91.473591.41405

83004110033101.452841.38019

8500341003810.251.572011.45699

86003310040111.606121.3871

87003211042111.670191.44244

1.86

Yes there is an indication of overpressured zone as we can see the dramatic curve change on the graph.

(ii)The depth at the top of the transition zone is 8000 ft.

(iii)

Q8.a)