Category Archives: Oil Field Knowledge

Driller’s Method Quiz No. 1

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In order to get more understanding about driller’s method, there are some quizzes that will help you get clear picture of it.

1st example –

Before start circulating, you have the following information

Original Shut in Drill Pipe Pressure = 500 psi

Initial Circulating Pressure (ICP) = 1500 psi

After end of 1st circulation of Driller’s Method, the drillpipe pressure gauge and the casing pressure gauge shows that the circulating drill pipe pressure = 1500 psi and casing pressure = 650 psi (see the figure below).

Do you think what is happening with the well?

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How are pressure and pit volume doing during the first circulation of the driller’s method?

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When we perform the first circulation of driller’s method, the casing pressure will increase due to gas expansion and the maximum casing pressure will be observed when the gas influx reaches surface.

When gas is moved upward during circulation, the gas will expand due to pressure decrease (refer to Boyle’s gas law P1V1 = P2V2). The higher gas is moved up inside annulus, the higher expansion will be. Therefore, the system hydrostatic pressure will be decreased. For this reason, the casing pressure will increase in order to maintain constant bottom hole pressure.

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7 Ways to Strengthen a Wellbore

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Strengthen a wellbore while drilling is the most effective technique to do to the wellbore before bad losses will be happened. Techniques of wellbore-strengthen are similar to lost circulation concepts. The wellbore-strengthen techniques emphasize on lost circulation prevention, increase in overall formation fracture gradient and elimination of fracture elongation. However, the lost circulation concepts focus on preventing losses of drilling fluid. In the drilling industry, 7 effective ways to strength the wellbore are as follows;

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Well Control Acronyms

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I would like to share some well control acronyms so you will be more understanding about content in well control.

ACF = Annular Capacity Factor

BHP = Bottom Hole Pressure

BOPE = Blow Out Preventer Equipment

BPUTS = Bring Pumps Up To Speed

CLF = Choke Line Friction

CMW / OMW = Current Mud Weight / Original Mud Weight

CP = Casing Pressure

DPP = Drill Pipe Pressure

ECD = Equivilant Circulating Density

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Shut in the well and get pressure data (driller’s method)

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As per previous topic, driller’s method well control, it stated about overall of driller method and this post will show the detailed of driller’s method and describe in term of operation stand point as well. I separates all detailed-step of driller method into several blog post because I want to add a lot of details for each topic so you will clearly understand about driller method and you also can apply with your real life operation.

Today I will start with the first one is to shut in well and obtain pressure information

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