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Seperti yang kita ketahui lumpur pemboran memberikan banyak manfaat
dalam operasi pemboran. Hal ini perlu di perhatikan juga bagaimana kecepatan
lumpur pemboran tesebut dalam membawa serbuk bor ke atas permukaan agar
tidak terjadi masalah yang di inginkan. Masalah yang terjadi saat serbuk bor tidak
ikut terbawa ke permukaan adalah terjadinya pengendapan di dasar lubang bor.
Untuk melihat apakah lumpur pemboran dapat bersirkulasi dengan baik
maka di perlukan perhitungan kecepatan kritis dan kecepatan rata rata. Data
penelitian seperti diameter lubang bor, berat lumpur , yield point, dan plastic
viscosity serta data setiap komponen rangkaian dan annulus akan di perlukan
untuk menentukan pola aliran pada rangkaian dan annulus. Penentuan pola aliran
juga di perlukan sehingga dapat mengetahui apakah lumpur pemboran berfungsi
dengan baik pada lubang bor.
Setelah melakukan perhitungan pada rangkaian maka di dapatkan hasil
VcDP = 5,99 fps < V dp = 13,18 fps, VcMWD Tools = 6,28 < V MWD Tools =
26,82 fps, Vc3xDC = 6,62 fps < V 3xDC = 47,69 fps, Vc4xHWDP = 6,28 fps <
V 4xHWDP = 26,82 fps, Vcjar = 6,28 fps < V jar = 26,82 fps, Vc16xHWDP =
6,76 fps < V 16xHWDP = 26,82 fps. Maka dapat dipastikan aliran lumpur di
rangkaian adalah turbulen sehingga menimbulkan efek pembersihan pada
rangkaian yang cukup baik. Pada annulus di dapatkan hasil VcaDP = 5,43 fps >
V adp = 5,10 fps, VcaMWD Tools = 6,66 fps < Va MWD Tools = 10,38 fps,
Vca3xDC = 6,10 fps < Va 3xDC = 8,05 fps, Vca 4xHWDP = 5,43 fps > Va
4xHWDP = 5,11 fps, Vcajar = 6,10 fps < Va jar = 8,05 fps,Vca16xHWDP = 5,43
fps > Va 16xHWDP = 5,11 fps, melihat hasil perhitungan pada annulus lebih
banyak nilai kecepatan rata -rata maka dapat dipastikan aliran lumpur pada
annulus mengalami turbulen.

As we know mud drilling provides many benefits in drilling operations.
This needs to be considered also how the speed of the drilling mud is so in
bringing drill powder above the surface so that there are no problems at will. The
problem that occurs when the drill powder is not carried to the surface is the
deposition at the bottom of the borehole.
To see if the drilling sludge can circulate properly, it is necessary to
calculate critical speed and average speed. Research data such as borehole
diameter, mud weight, yield point, and plastic viscosity as well as data on each
circuit component and annulus will be needed to determine flow patterns in
circuits and annulus. Determination of flow patterns is also needed so that it can
find out if the drilling sludge is functioning properly in the borehole.
After doing calculations on the circuit then the vcDP result = 5.99 fps <
V dp = 13.18 fps, VcMWD Tools = 6.28 < V MWD Tools = 26.82 fps, Vc3xDC
= 6.62 fps < V 3xDC = 47.69 fps, Vc4xHWDP = 6.28 fps < V 4xHWDP = 26.82
fps, Vcjar = 6.28 fps < V jar = 26.82 fps, Vc16xHWDP = 6.76 fps < V 16xHWDP
= 26.82 fps, then it is certain that the flow of mud in the circuit is turbulent so as
to cause a cleaning effect on a fairly good circuit. In annulus obtained results
VcaDP = 5.43 fps > V adp = 5.10 fps, VcaMWD Tools = 6.66 fps < Va MWD
Tools = 10.38 fps, Vca3xDC = 6.10 fps < Va 3xDC = 8.05 fps, Vca 4xHWDP =
5.43 fps > Va 4xHWDP = 5.11 fps, Vcajar = 6.10 fps < Va jar = 8.05 fps,
Vca16xHWDP = 5.43 fps > Va 16xHWDP = 5.11 fps, Looking at the results of
calculations on annulus more average speed values then it can be ascertained that
the flow of mud in annulus is turbulent.