Question

Perform the following calculation for the 9.625” intermediate casing cement job for your well offshore Texas.   

Assume:     

          Surface Casing at 5940 ft          13.375 in     68 lb/ft       

          Intermediate Casing at 10,300 ft         9.625 in.      47 lb/ft P-110        Buttress thread          with Float shoe on the bottom, Float collar 2 joints above shoe

          Cement:      Lead slurry – Balcones Class H + 35% Silica + 7% Bentonite   

                                                          14.5 lb/gal   1.92 cuft/sk 8.89 gal/sk water

                                      Tail slurry – Balcones Class H + 35% Silica + additives

                                                          16.4 lb/gal   1.40 cuft/sk 4.99 gal/sk water

          Hole:           12.25 in diameter plus   use 30% excess cement in open hole

          Rig pumps:           0.107 bbl/stroke

Requirements:                1000 ft of “tail slurry”

                                                Cement top at 4000 ft

                                                70 barrels of the lead spacer in front of cement

                                                100 ft of freshwater spacer behind cement (tail spacer)

                                                Mix and pump cement at 4 bbl/min

                                                Displace cement and spacer with mud using rig pumps at

                                                          8 bbl/min

Determine:

A) The volume of the lead slurry and the volume of the tail slurry of cement required in barrels cubic feet and sacks of cement.

B) The volume of makeup water required for each of lead and tail slurry

C) Volume of water required for tail spacer

D) Volume of mud required to displace cement and spacer in barrels

E) Time required to mix and pump cement and spacer and displace with mud (absolute minimum pumping time for cement)

Answer 1

Boloweet Presentu stack 7 T H float colla - First casing Casing Drilled boarsehole Caning L e Interaudirate coming is audiate Dalling underary Lining with casing The outur tubes are called cany Casing lines the cold bore and thus protects the layu of soil and adsove all the groundicate from bung contannated by the cutlery mud or foreand fluude It also stabilizes the collbore, so casing must be able to withstand especially high loads. the drilling and casug alternate the dilesting is taken out at sparfe intuvas and the wellbore is lined with caring and commited.

Sufene. caring at squoft tutur audiate caring at 10300ft Golblft 47 lblet Cement lead shorny class H 174. Bentonite 51. sodium chloride tail shurry / classif 351 silica 3.1 Cache u.99 gallsaud coatin uvy :(Horox (35-6.+501))* 15940) Valuun of x 40 - Bols - 2000ft xo.6946 али с = 1389.20 ft3 tail sturey мош с ecoff Copenhah) x 0.6946ft3/6= 277.84 ft 3 bo 277.84ft3 x 40ft (shoes) X (2.2) Excurs - 678. Soft 3