Search Results for: shut in procedure

Summary of Driller’s Method

I would like to summarize about driller’s method with these simple steps as listed below;

1. Shut in the well and get pressure data (casing pressure and drill pipe pressure). The float bumping procedure may be conducted depending on whether you have a float in the drillstring or not.

2. Perform the well control calculations

3. Establish Circulation as per driller’s method

Fist circulation of Driller’s Method

a. Bring the pumps up by holding casing pressure constant

b. Circulate out the influx by holding drill pipe pressure constant

c. Shut down pumps by holding casing pressure constant

Second circulation of Driller’s Method

d. Raise mud weight up to desired kill mud weight

e. Bring the pumps up to speed by holding casing pressure constant

f. Circulate kill mud to the bit by holding casing pressure constant

g. Switch to hold drill pipe pressure

h. Circulate kill mud to surface by holding drillpipe pressure constant

i. Ensure that kill mud is all around by measurement, not by calculated stroke counts

j. Shut down pumps by holding casing pressure constant

k. Check casing pressure and drill pipe pressure. Both pressures must be 0 psi. You may see trapped pressure so as to make sure this is the trapped pressure, bleed pressure in small amount and observe pressure. Pressure should not increase after bleeding off. If pressure is building back after bleed off, there is still kick in the wellbore. You need to circulate more or raise the mud weight

Driller’s Method Rules

I also would like to emphasize these two vital rules of driller’s method that you need to keep in your mind all the time.

1st rule: Anytime you do something with pumps as start, stop or change pump speed, you must always hold casing pressure constant. This is very important.

2nd rule: For all other times, you always hold the side that has constant fluid density.

Reference book: Well Control Books

Well Control Formulas Part 1

I would like to share with you about well control formulas that might be advantageous for you in the future. I seperate into several parts for you to easy to follow.

Before going into all calculations, I would like to emphasize about rounding rules that we will use for well control calculation.

1. Kill Mud Density: We must round up to one decimal place from a calculated kill mud density. For example, if we have the calculated kill mud density of 13.32 ppg, we will round it up to 13.4 ppg.

2. Leak Off Test (LOT): We must round down to one decimal place from a calculated Leak Off Test value. For example if we have the theoretical LOT of 15.57 ppg, we will round down to 15.5 ppg.

When any of the above values have been calculated, the rounded numbers must be used in subsequent calculations.

Well Control Course Equations Part 1

Pressure (P) – psi

Pressure (psi) = Force (lb) / Area in Square Inch (in 2)

Pressure Gradient (G) – psi/ft

Mud Gradient ( Psi/ft ) = Mud weight ( PPG) x 0.052

Continue reading

Drilling Formulas and Calculation Sheets

Update… I add all drilling formulas together into one file which allows me to update it and share with you all easily.  Please find the drilling formula calculation sheet.

Download>>>Drilling Formula Calculation Sheet

This is version no.1 which was distributed on 28-Mar-11.

You can read all detail of this file via this link https://www.drillingformulas.com/drilling-formula-calculation-sheet/

Please feel free to give me feedback.

Ps. The following formulas are in this calculation sheet.
Accumulator Capacity – Usable Volume per Bottle Calculation (Surface Stack)

Accumulator Capacity – Usable Volume per Bottle Calculation for Subsea BOP

Adjusted maximum allowable shut-in casing pressure

Amount of cuttings produced per foot of hole and total solid generated

Angle Averaging Method in Directional Drilling Calculation

Annular Velocity (AV) Calculation

Balanced Tangential Method Calculation

Barrels of slug required for desired length of dry pipe

Bulk Density of Cuttings by Using Mud Balance

Buoyancy Factor Calculation

Calculate Annular Capacity

Calculate Annular Pressure Loss

Calculate Equivalent Circulation Density (ECD) with complex engineering equations

Calculate inner capacity of open hole/inside cylindrical objects

Calculate Oil-Water ratio from retort data

Calculate Pressure Gradient and Convert Pressure Gradient

Calculate Specific Gravity (SG) in oilfield unit

Convert Pressure into Equivalent Mud Weight

Convert specific gravity to mud weight (ppg and lb/ft3) and pressure gradient (psi/ft)

Correctedd D Exponent Calculation

Critical RPM to Avoid Excessive Vibration

D Exponent Calculation

Decrease oil/water ratio

Depth of Washout

Determine height of light weight spot pill to balance formation pressure

Determine the actual gas migration rate

Determine the density of oil and water mixture

Dilution of Mud System to Control Low Gravity Solid by Adding Base Fluid

Dilution of Mud System to Control Low Gravity Solid by Adding Mud

Dogleg Severity Calculation based on Radius of Curvature Method

Dogleg Severity Calculation Based on Tangential Method

Drill pipe pulled to lose hydrostatic pressure

Drilling cost per foot

Equivalent Circulating Density (ECD) in ppg

Estimate gas migration rate in a shut in well

Estimate Type of Influx (kick)

Formation Integrity Test (FIT) Procedure and Calculation

Formation Pressure from Kick Analysis

Formation Temperature

Hydraulic Horse Power (HPP) Calculation

Hydrostatic Pressure (HP) Decrease When POOH

Hydrostatic Pressure Calculation

Increase mud weight by adding barite

Increase Mud Weight by Adding Calcium Carbonate

Increase Mud Weight by Adding Hematite

Increase oil/water ratio

Lag Time for Drilling Business and How to Calculate Theoretical Lag Time

Leak Off Test (Procedures and Calcuation)

Loss of Hydrostatic Pressure due to Lost Return

Maximum formation pressure that can be controlled when we shut the well in

Maximum influx height to equal the maximum allowable shut-in casing pressure

Maximum Initial Shut-In Casing Pressure (MISICP)

Maximum surface pressure from kick tolerance factor

Minimum Curvature Method

Mixing Fluids of Different Densities with Pit Space Limitation

Mixing Fluids of Different Densities with Pit Space Limitation

Pipe Displacement Calculation

Pressure and force relationship and applications

Pressure Required to Break Circulation in Annulus

Pressure Required to Break Circulation Inside Drillstring

Pump Output Calculation for Duplex Pump and Triplex Pump

Pump pressure and pump stroke relationship

Radius of Curvature Method

Round trip ton-miles Calculation

Starting volume of original mud (weight up with Barite)

Starting volume of original mud (weight up with Calcium Carbonate)

Starting volume of original mud (weight up with Hematite)

Tangential Method Calculation

Temperature Conversion Formulas

Trip Margin Calculation

Volume of mud in bbl increase due to adding barite

Volume of Mud Increases due to Adding Calcium Carbonate

Volume of Mud Increases due to Adding Hematite

Weight of slug required for desired length of dry pipe with set volume of slug