Casing having an OD of 9.625 in. and an ID of 8.535 in. is to be...

  

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Casing having an OD of 9.625 in. and an ID of 8.535 in. is to be cemented at a depth of 13,300 ft in a 12.25-in. borehole. A 40-ft shoe joint will be used between the float collar and the guide shoe. It is desired to place 2,500 ft of cement in the annulus. Each sack of Class H cement will be mixed with 4.3 gal of water to which is added 18% salt (by weight of water), A small quantity of dispersant will be blended with the cement, but this additive has no significant effect on the slurry yield or density. Compute the density of the slurry, the yield of the slurry, the number of sacks of cement required, and the cementing time. Assume that cement can be mixed at a rate of 20 sacks/min and displaced at a rate of 9 bbl/min and use an excess factor of 1.5. The salt will be added to the water phase and thus does not blend with the dry cement. Answer: 16.7 lbm/gal; 1.09 ef/sack; 1,092 sacks; 159 minutes. (Problem 3.24) 3.25 A 7.0-in. liner having an ID of 6.276 in. is to be cemented at a depth of 15,300 ft in an 8.5-in. hole. Casing is set at 13,300 ft as described in Problem 3.24, and a 300-ft overlap between the casing and liner is desired. A 40-ft shoe joint will be used be- tween the float collar and the guide shoe. It is desired to use 1,000 ft of preflush (in annulus) and then fill the total annular space opposite the liner with cement. Class H cement containing 35% silica flour, and 1.2% HALAD-22A will be mixed with 5.8 gal of water containing 18% salt (by weight of water). Compute the slurry density, the slurry yield, the volume of cement slurry required if the caliper log shows an average washout of 2.0-in. increase in hole diameter, and the number of sacks of Class H cement needed. Neglect the effect of the HALAD-22A on the density and volume of the slurry. Ans wer: 16.3 Ibm/gal, 1.51 cf/sack, 474 sacks. Casing having an OD of 9.625 in. and an ID of 8.535 in. is to be cemented at a depth of 13,300 ft in a 12.25-in. borehole. A 40-ft shoe joint will be used between the float collar and the guide shoe. It is desired to place 2,500 ft of cement in the annulus. Each sack of Class H cement will be mixed with 4.3 gal of water to which is added 18% salt (by weight of water), A small quantity of dispersant will be blended with the cement, but this additive has no significant effect on the slurry yield or density. Compute the density of the slurry, the yield of the slurry, the number of sacks of cement required, and the cementing time. Assume that cement can be mixed at a rate of 20 sacks/min and displaced at a rate of 9 bbl/min and use an excess factor of 1.5. The salt will be added to the water phase and thus does not blend with the dry cement. Answer: 16.7 lbm/gal; 1.09 ef/sack; 1,092 sacks; 159 minutes. (Problem 3.24) 3.25 A 7.0-in. liner having an ID of 6.276 in. is to be cemented at a depth of 15,300 ft in an 8.5-in. hole. Casing is set at 13,300 ft as described in Problem 3.24, and a 300-ft overlap between the casing and liner is desired. A 40-ft shoe joint will be used be- tween the float collar and the guide shoe. It is desired to use 1,000 ft of preflush (in annulus) and then fill the total annular space opposite the liner with cement. Class H cement containing 35% silica flour, and 1.2% HALAD-22A will be mixed with 5.8 gal of water containing 18% salt (by weight of water). Compute the slurry density, the slurry yield, the volume of cement slurry required if the caliper log shows an average washout of 2.0-in. increase in hole diameter, and the number of sacks of Class H cement needed. Neglect the effect of the HALAD-22A on the density and volume of the slurry. Ans wer: 16.3 Ibm/gal, 1.51 cf/sack, 474 sacks.