Drilling Formulas and Drilling Calculations

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About 'Drilling Formulas and Drilling Calculations' Channel

Learn about drilling formulas frequently used in drilling and workover operation.

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Drill String Components – VDO Training

[...]   There are many components that make up the drill string as shown in this graphic. Drill pipe is a strong but relatively lightweight pipe. Crew members attach it to a top drive or Kelly. [...]

Basic Understanding about Drill Pipe

[...] major component of the entire drillstring. Typically, 90% – 95% of the total length is drill pipe. Thread connection of drill pipe is called “Tool Joint”. One end of drill pipe has [...]

How Does Deep Water Drilling Work

[...] and guide are run down to the sea floor. After the conductor pipe penetrates the sea floor the drill pipe is released and pulled back to the vessel. A large drill bit connected to the bottom of the [...]

Basic of Drillpipe Tensile Capacity and Its Calculation

[...] This article demonstrates basic knowledge understanding of tensile capacity of the drill pipe and some calculation. First of all we need to know basic of material strength and for our case [...]

Casing Shoe Pressure While Circulating Influx in Well Control Situation

[...] Shoe   Figure 1 – Top of Gas Kick Below Casing Shoe As you can see in Figure 1, hydrostatic pressure above the casing shoe remained constantly because the fluid column is the same. The [...]

Mud Gas Separator (Poor Boy Degasser) Plays A Vital Role in Well Control Situati...

[...] will move up and mud will goes down due to gravity (see – Figure 1). Mud leg will provide hydrostatic pressure in order to prevent mud going through the separator into the rig. Figure 1 - Mud Gas [...]

Lost Circulation and Well Control

[...] However, this type of fluid loss will not lead to well control situation because the total hydrostatic pressure does not decrease. Total loss is the worst situation because there is no mud returning [...]

What Are Differences Between Possible and Positive Well Control Indicators?

[...] in drilling breaks (ROP change) – If the differential between formation pressure and hydrostatic pressure created by drilling mud decreases, there is possibility to increase rate of penetration [...]

Learn about Maximum Surface Pressure in Well Control (MASP, MISICP and MAASP)

[...] of the well. The higher the mud weight is, the lower MAASP and MISCP are. Reference books:  Well Control Books [...]

Trip Tank and Its Importance to Well Control

[...] , the well has static loss. Figure 4 – Trip Tank While Flow Checking Reference books:  Well Control Books [...]

Know about Swabbing and Well Control

[...] mud drilling into clay formation Pump out of hole instead of pulling out Reference books:  Well Control Books [...]

Abnormal Pressure Caused By Faulting

[...] equivalent mud weight in order to prevent the well control situation. Reference books:  Well Control Books [...]

Driller’s Method or Wait and Weight Method – What is The Practical Well Control ...

[...] for a while. There is high chance for wellbore to collapse and pack the drillstring. Casing Shoe Pressure Shoe will be exerted the maximum pressure when top of gas kick is at the casing shoe. Once the [...]

Choke Line Friction Pressure as Kill Weight Mud Approaches the Surface

[...] the well due to low flow rate Casing pressure is 0 psi due to fully opened choke,  the shoe pressure be determined by the following calculation process. Figure 1 - Shoe Pressure with [...]

Choke Line Friction – How Is It Affect Deepwater Well Control?

[...] annular pressure loss in the well due to low flow rate Figure 2 - Example of CLF What is the shoe pressure if we bring pump up to speed without considering CLF? Figure 2 is the diagram based on the [...]

Casing Shoe Pressure While Circulating Influx in Well Control Situation

[...] Many people ask us a lot of questions regarding shoe pressure while circulating kick (wellbore influx) out of the wellbore. We will summarize all the [...]

How To Compensate Choke Line Friction For Deep Water Well Control

[...] Choke line friction pressure will increase bottom hole pressure while circulating to kill the well therefore it must be compensated in order to maintain [...]

Determine Bottom Hole Pressure from Wellhead Pressure in a Dry Gas Well

[...] pressure. Gas is compressible but fluid is incompressible. The formula to determine the bottom hole pressure of dry gas well is shown below; Where; Pbh = bottom hole pressure in psia (absolute [...]

Basic Understanding about Well Control with Pipe off Bottom

[...] technique. The volumetric well control to let the gas migrate to surface with the bottom hole pressure nearly constant. This option is applicable when the influx is gas. Strip the drillstring [...]

Choke Line Friction – How Is It Affect Deepwater Well Control?

[...] is so small. However, the choke line friction in deepwater operation has a big effect bottom hole pressure. Killing the well without considering the CLF will add excessive pressure and it increases [...]

Casing Seat Selection – How To Select Casing Setting Depth

[...] the fracture dashed line curve. Then draw the vertical line from Point C to intersect the formation pressure dashed line curve at Point D. This is the section casing string which should be set from 3, [...]

Why Do We Need To Minimize Influx (Kick)?

[...] Influx Height = 1000 + 454 = 1454 ft   Figure 3 – Height of 50 bbl kick What is formation pressure at 10,000’MD/10,000TVD? Formation pressure = 0.052 x 10.5 x 10,000 = 5,460 psi What [...]

Understand about Formation Pressure in Drilling

[...] Formation pressure is important information for well planning and operation because it impacts on several [...]

Kick Scenarios in Horizontal Wells For Well Control

[...] bottom hole pressure control resulting in hydrostatic pressure in the wellbore less than formation pressure. This problem can be mitigated by ensuring that the correct procedures are performed. [...]

Kick Prevention for Horizontal Wells

[...] drilling into a pay window, it might be a good idea to flow check in order to check if the mud weight is good for well control before drilling deeper into the zone. Plan the horizontal section to [...]

Pore Pressure Evaluation While Drilling Is Important For Well Control

[...] drilling. The actual pore pressure will dictate where to set the casing, how much the actual mud weight should be, what potential problems are, etc. The actual reservoir pressure obtained while [...]

Fracture Gradient Reduction Due to Water Depth

[...] will reduce the formation fracture pressure and offshore wells will have smaller margin between mud weight and fracture pressure than land wells because of water depth effect. At the same water depth, [...]

Casing Design Overview – Overall Process of How To Do Casing Design in Oil and G...

[...] formations should be cased off before going deeper because the deeper depth requires higher mud weight which will result in more serious of pipe stuck issue. o   Wellbore stability – [...]

How To Measure Choke Line Friction (CLF) for Deepwater Well Control

[...] , you can use the same procedure to measure the frictional pressure at the kill line too. Reference books:  Well Control Books [...]

Behavior of Gas in a Horizontal Well Kick

[...] Wells” which will go into details on how to prevent the well control in the horizontal wells. Reference books:  Well Control Books [...]

Shut-In Procedure while Tripping with a Subsea BOP Stack

[...] after closure of the BOP. Inform rig supervisors. Prepare to strip back to the bottom. Reference books:  Well Control Books [...]

Hard Shut-In Procedure while Drilling with a Subsea BOP Stack

[...] and start record data as pit gain, Shut In Casing Pressure, Shut In Drill Pipe Pressure. Reference books:  Well Control Books [...]

Introduction To Well Control for Horizontal Wells

[...] change when the gas kick moves from a horizontal section to a vertical section. This make casing pressure profile increase drastically when compared to vertical or deviated wells. Kick detection in [...]

Why Do We Need To Minimize Influx (Kick)?

[...] do this. In this topic, we will demonstrate how kick volume will affect wellbore and surface casing pressure. Main concept of minimizing kick coming into the wellbore is to minimize surface casing [...]

How To Compensate Choke Line Friction For Deep Water Well Control

[...] = Hydrostatic Pressure in Annulus + Casing Pressure Figure 1 – Bottom hole pressure at static condition At dynamic condition – the bottom hole [...]

Choke Line Friction – How Is It Affect Deepwater Well Control?

[...] Example: Water depth = 5,000 ft Shoe depth = 15,000 ft TVD Hole depth = 25,000 ft TVD Casing pressure = 300 psi Current mud weight = 12.0 ppg Choke line friction pressure @ 25 spm = 400 psi [...]

Maximum ROP Before Fracture Formation

[...] (ECD) = ρeff + ρa  — Equation 4 Equivalent Circulating Density (ECD) = Fracture Gradient (FG) — Equation 5 With those relationships above, we can derive the maximum ROP into [...]

Casing Size Selection – How To Select Casing Size to Match the Drilling and Comp...

[...] : According to the previous example, this is the casing design based on pore pressure and fracture gradient (Figure 1). Figure 1- Casing Design Based On Pore Pressure and Fracture Gradient The casing [...]

Casing Seat Selection – How To Select Casing Setting Depth

[...] the pore pressure dashed line at Point C. Then draw a vertical line from Point C to the fracture gradient dashed line at Point D (Figure 4). The Casing must be set from 1,800’ TVD to 4,500& [...]

Fracture Gradient Reduction Due to Water Depth

[...] Fracture gradient is one of the critical information which drilling engineers need to know in order to design [...]

Casing Shoe Pressure While Circulating Influx in Well Control Situation

[...] based on water based mud and gas kick.  First Scenario – Top of Gas Kick Below Casing Shoe   Figure 1 – Top of Gas Kick Below Casing Shoe As you can see in Figure 1, [...]

Driller’s Method or Wait and Weight Method – What is The Practical Well Control ...

[...] for a while. There is high chance for wellbore to collapse and pack the drillstring. Casing Shoe Pressure Shoe will be exerted the maximum pressure when top of gas kick is at the casing shoe. [...]

Why Do We Need To Minimize Influx (Kick)?

[...] , you will have a chance to fracture the weakest formation in the wellbore such as formation at casing shoe. You need to remember that more influx equals to more surface pressure. We will do basic [...]

Choke Line Friction – How Is It Affect Deepwater Well Control?

[...] the CLF will add excessive pressure and it increases the chance of fracturing formation at casing shoe or anywhere in the well. Figure 1 is a simple diagram showing the direction of CLF while a [...]

Basic Understanding About Positive Displacement Mud Pumps in Drilling Industry

[...] pumps have two cylinders with double acting. It means that pistons move back and take in drilling mud through open intake valve and other sides of the same pistons, the pistons push mud out [...]

What is the longest, deepest and largest hole ever drilled on earth?

[...] project’s progress. Despite the scientists’ efforts to combat the heat by refrigerating the drilling mud before pumping it down, at twelve kilometers the drill began to approach its maximum heat [...]

Oil & Gas Well Casing – VDO Training

[...] troublesome formations. That is, they can be drilled by adjusting the properties of the drilling mud but once drilled, need to be sealed off to prevent problems in drilling the deeper [...]

Buoyancy Factor with Two Different Fluid Weights in The Well

[...] from shoe to surface and the planned cement weight is 14.0 ppg. The displacement fluid is drilling mud currently used. Please determine the following items. Air weight of casing string Buoyed [...]

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Drill String Components – VDO Training

[...]   There are many components that make up the drill string as shown in this graphic. Drill pipe is a strong but relatively lightweight pipe. Crew members attach it to a top drive or Kelly. [...]

Basic Understanding about Drill Pipe

[...] major component of the entire drillstring. Typically, 90% – 95% of the total length is drill pipe. Thread connection of drill pipe is called “Tool Joint”. One end of drill pipe has [...]

How Does Deep Water Drilling Work

[...] and guide are run down to the sea floor. After the conductor pipe penetrates the sea floor the drill pipe is released and pulled back to the vessel. A large drill bit connected to the bottom of the [...]

Basic of Drillpipe Tensile Capacity and Its Calculation

[...] This article demonstrates basic knowledge understanding of tensile capacity of the drill pipe and some calculation. First of all we need to know basic of material strength and for our case [...]

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