Formulas And Calculations For Drilling Production And Workover Pdf
Cuttings Slip Velocity These calculations give the slip velocity of a cutting of a specific size and weight in a given fluid. Separate chapters deal with calcu- American Association of Drilling lations for drilling fluids, pressure control, Engineers hydraulics, and much more.
Obtain formation pressure gradient from electric logs, density measure- ments, or logging operations. Obtain formation pore pressure, P, from electric logs, density measure- ments, or mud logging personnel. Add a value to the maximum mud weight that is needed to drill the interval. This involves pumping kill weight fluid down the tubing and, in some cases, down the casing.
It also serves as a handy study zyxwvu guide for drilling and well control certifi- cation courses. The following procedures and calculations are more commonly used in workover operations, but at times they are used in drilling operations.
Determine the best pump rate to use. Remember me on this computer. Maintain casing pressure constant by bleeding small volumes of mud from the well until total mud bled equals the correct volume to bleed per cycle.
Increasing the pressure by psi increments, waiting for a few minutes, then increasing by another loopsi, and so on, until either the equiva- lent mud weight or leak-off is achieved. Users should be aware that the lubricate and bleed method is often a very time consuming process, whereas another method may kill the well more quickly. Circulate and condition the mud to ensure the mud weight is consistent throughout the system. After that, calculate total volume of the tank and subtract the empty space. Bullheading Bullheading is a term used to describe killing the well by forcing formation fluids back into the formation by pumping kill weight fluid down the tubing and in some cases down the casing.
Maximum mud weight with returns. How many barrels of mud will be required to bump the plug? Increasing the pressure by psi increments, waiting for a few minutes, then increasing by another psi, and so on, until either the equivalent mud weight is achieved or until Leak-off is achieved. They prefer to circulate through the choke and increase back pressure by slowly closing the choke.
Determine maximum mud density. Pressure loss for laminar flow Ps.
Ten barrels of water are to be pumped ahead of the slurry. If, however, the swab pressure is desired, this pressure would be subtracted from the hydrostatic pressure.
If no excess is to be used, simply omit the excess step. Open the choke and bleed fluid out of the well until the drill pipe pressure drops to the lower limit. The adjusted pressure chart would have psi on the drill pipe gauge.
In this case, however, water will be added and the volume of oil will remain constant. If no excess is to be used, omit the excess step. If, however, the swab pressure is desired, this pressure would be subtracted from the hydrostatic pressure of the mud in the wellbore. The material pumped down the drill pipe came over the shaker after strokes. Use the following data to spot an oil-based pili around the drill collars plus ft optional above the collars.
If the influx is allowed to migrate without expanding, pressures will increase everywhere in the well- bore. How many strokes will be required to bump the top plug? Drill Pipe pressure method Volumetric method Drill pipe pressure method English units This is a constant bottom hole pressure method of well control, and it is the simplest method. Continue to strip pipe with the choke closed unless the casing pressure approaches the maximum allowable surface pressure.
PDF) Formulas and Calculations for Drilling Production and Workover 2E
This is the weight of the casing Weight. Kgslsq cm Pascals Atmospheres Poundslsq in. Allow shut in casing pressure to increase by Ps without bleeding mud from the well. Using the kill sheet just completed, adjust the pressure chart to read in increments that are easy to read on pressure gauges. Allow the shut in casing pressure to increase by Ps without bleeding from the well.
Bleed the closed end displacement volume from the trip tank to the stripping tank. The actual waiting time is needed not to allow fluid to fall, but rather, for gas to migrate up through the kill fluid.
Obtain formation pore pressure, P, from electric logs, density measurements, or from mud logging personnel. If it is ignored it can cause formation damage and mud losses. This is dead hydraulic fluid. Select a working pressure, Pw. This is only applicable until the tank is half full r - h.
Determine formation pressure. With the stand down, close the choke. It has a spiral binding so it will lay flat and stay open on a desk. Continue the process until a low level, safe working pressure is attained.
Cuttings must be washed free of mud. Move counterweight to obtain new balance. The annular velocity and the cutting net rise velocity are also calculated. Select a range of working pressure, Pw. Gas lubrication-pressure method Because of its simplicity, the pressure method is the preferred method of gas lubrication.
Examples are used throughout to make the formulas as easy as possible to understand and work, and often exact words are used rather than symbols. Using the information given below, the necessary calculations will be performed to kill the well by bullheading. Using the information given below, the gift of acabar pdf calculations will be performed to kill the well by bullheading.
Production, and Workover has been Techniques and Technology for Improving updated t o include metric conversion Solids Control Management tables. Gas is allowed to expand while stripping. Determine annular velocity v. Trip tank measures gas expan- zyx sion similar to volumetric method. Allow the shut in casing pressure to further increase by Pw without bleed- ing from the well.
Determine the number of barrels of mud gained due to pumping the slug and determine the feet of dry pipe. Pump lube mud through the kill line to increase the casing pressure by the working pressure range, Pw.
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