Cement Job Casing Calculation

Bagi mahasiswa Teknik Perminyakan atau yang bekerja dibidang Cementing sebagai Operator dan dibawahnya (Engineer kagak perlu lagi), sekedar buat belajar atau latihan kalau sedang off.. Lumayan buat ngindarin ketergantungan ama supervisor nya..

SUBJECT  :  7" CASING CEMENT JOB Single Slurry

Data
Descriptions    Outside Dia. (inch)   Inside Dia. (inch)  Csg Weight (ppf)
Open Hole               8,5  excess 50% --------------------------------
Csg                          9,625                    8,681                     47
Csg                           7                           6,276                     26


WELL DIAGRAM

Slurry Properties (from Data Lab) 
Properties                                        Unit
Density                                  15,8   ppg
Yield                                   1,182    ft³/sx
M/W                                   5,300   gal/sx
Compressive Strength        3350   psi
Thickening Time                  4:00   hours

A. CEMENT SLURRY VOLUME

1. Rat Hole Vol.
    (OH)²       x       L       =     (8,5)²     x   (1950 - 1944)
   1029,4                              1029,4
                                          =    0,421 bbl
                 excess 50%   =    0,21   bbl  + ----> (0,421bbl  x 50%)
                    Rat Hole   =    0,631 bbl 

2.  7" Shoe Track
     (ID)²         x     L         =     (6,276)²     x   (1944 - 1894,14)
   1029,4                                 1029,4
         Shoe Track        =    1,908 bbl

3. Annular Capacity between OH & 7"Csg
    (OH)² - (OD)²   x   L  =     (8,5)² - (7)²    x   (1944 - 405)
         1029,4                             1029,4
                                           =    34,76 bbl
                excess 50%     =    17,38 bbl         +   
    Ann. OH & 7"Csg   =    52,14 bbl




4. Annular Capacity between 9 5/8"Csg & 7"Csg

   (ID)² - (OD)²    x    L             =     (8,681)² - (7)²    x   405
         1029,4                                        1029,4
    Ann. 9 5/8"Csg & 7"Csg   =    10,37 bbl


Total Cement Slurry              =   0,631 bbl + 1,908 bbl + 52,14 bbl + 10,37 bbl
                                                =   65,049 bbl
                                                =   365,22 Cuft

B. SACK OF CEMENT REQUIRED

Density         15,8 ppg
Total Slurry   365,22 Cuft   :   Yield 1,182 ft³/sx   =   309 sx
M/W            5,300 gal/sx   x   309 sx  :   42 gal   =   39 bbl
Total Mixing Water w/ 5 bbls Excess                    =   44 bbl
Equivalent to Cement                                           =   (309 sx  x 44 bbl) / 39 bbl
                                                                           =   348,6 sx 

C. SLURRY COMPOSITIONS 
Additives            Concentration                                                                                             Total
Fresh Water         (Data from lab)   gal/sx            x   348,6 sx (Cement Req)   :     42 gal      =   ........ bbl
Liquid Additive 1 (Data from lab)   gal/sx            x   348,6 sx                                                =   ........ gal
Liquid Additive 2 (Data from lab)   gal/sx            x   348,6 sx                                                =   ........ gal
Solid Additive 1   (Data from lab)     %               x   348,6 sx                          x     94           =   ........ lbs
Solid Additive 2   (Data from lab)     %               x   348,6 sx                          x     94           =   ........ lbs


D. DISPLACEMENT
Displace    =>      (ID)²       x   L  (F.Collar until surface)     =     (6,276)²     x   (1894,14)

                         1029,4                                                             1029,4
                                                                                          =     72,5 bbl
                                                    Surface line volume        =        1,5 bbl   +
                                                            Total Displace      =      74   bbl


E. CEMENT JOB PROCEDURES

1.   Physical checked that the Bottom and Top Plugs can go through the Casing.

2.   Load the Bottom Plug and Top Plug into the Cementing Head.

3.   RIH 7" Casing to TD and established Mud Circulation (Mud properties should have lower PV and YP) with atleast 1 1/2 circles.

4.   Flush line and fill up line with Chemical Wash  ...... bbl (if need)

5.   Pressure test the surface lines to 2000 psi.

6.   Continue Pump Chemical Wash Flusher ........ bbl (if need)

7.   Pump the Weighted Spacer :  ........ bbl

8.   Drop Bottom Plug (Double Check).

9.   Mix & pump Cement slurry : 65,049 bbl with density 15,8 ppg ; Cement "G" 309 sx, Mix Water 39 bbl

10. Drop the Top Plug (Double checked).

11. Pump displace 10 bbls Drill Water with Cementing Unit

12. Continue displacement 64 bbls of Mud ( 74 bbl - 10 bbl = 64 bbl )

(Do not over displace more than 1/2 the Capacity of Shoe Track)

13. Bump the Plug with at least 1200 Psi above the Circulating Pressure.

14. Bleed of the Pressure and checked for mud returned in the Cementing Unit. 

( If the Float equipment doesn't hold, then pump all fluid back in the hole and shut-in the pump until cement samples set in surface.)

15. Wait On Cement or continue another program. 

Silahkan download & lihat,
Contoh 7" Csg Cement Job Double Slurry format excel (klik)
Video Simulasi Cementing
jika ada yang keliru mohon untuk koresi.... ;)

(Roliamsyah)

to be continued Balance Plug Cement Job Calculation