After determining that a maximum gas value is ready for processing, control passes to step 98 where the gas value is written to the field data file for the associated depth. In the rotary drilling for oil and gas a drilling fluid is pumped down the drill pipe, out the drill bit, and up the annulus between the outside of the drill pipe and the drilled bore. Knowing the internal volume of the drill pipe, the down pipe strokes or minutes were calculated and then subtracted from the total circulation to obtain the lag from the bottom to the surface. For subsequent pressures step performs a running average with previous pressure values. The next video is starting stop. Learn English with Gill engVid Recommended for you. Of course, as the depth of the bore hole increases both methods become inaccurate.

• With certain annular volume, the.

I got an email from Sanan asking me about how to calculate lag time. First of all, you need to know what the lag time is. Lag time is traveling. A continuously adjusted calculated annulus drilling fluid lag time while pump pressure while drilling and calculating lag time from the relationship on the drilling rig pumps for monitoring pump strokes or using straight time.
Because only pumping volume and stroke per mins used for calculation.

Schlumberger Software 10, views. Example — Determine lag time from bottom to surface with the following information. Greer, Carl T. Still a further object of the present invention is wherein a base lag time is determined for one of the lag measurements and the other lag time measurements for different values of pump pressure are converted to a factor of the base lag time for providing an input to a computer.

 RIGHT PUPIL FIXED AND DILATED PUPILS These field inputs are respectively:. In addition, the method includes measuring the depth of the drill bit and using the change in the depth measurement for adjusting the calculated lag time. Y Combinator Recommended for you. Bookmark the permalink.Houston, TX. The RSA Recommended for you. But the successful operation of the entire system was dependent upon the full-time presence of an observer-operator mud logger.
[Drilling Fluids]. The time taken for cuttings to reach the surface. The term is also used in place of cycle time.

Alternate Form: cycle time. See: carbide lag test. Lag time calculation.

Applied Drilling Formulas, Basic Drilling Formulas, Drilling Fluid Formulas. Drill collar weight calculation to prevent drill pipe buckling. Lag time is the time the mud takes to travel inside the hole between two time. It is more practical to calculate lag in terms of pump strokes as the flow rate is not.
Earth well borehole drilling and logging system.

Once a measurement in pump strokes was obtained the speed of the pump was irrelevant.

Turn a ceiling fan into a wind turbine generator?! For example, conventional gas extraction equipment 30 may be used for liberating gas in the return drilling fluid, to be drawn into the gas analyzer What are Magnetic Toolface and Gravity Toolface?

The method of claim 1 wherein a base lag time is determined for one point of lag time measurements and the other lag time measurments for different values of pump pressures are converted to a factor of the base lag time for providing an input to a computer.

Step calculates the flow rate deviation and accordingly changes the time base insde the field input pre-processor 46 via a special transmission to compensate for the increase or decrease in flow rate.

 Lag time calculation drilling machine This pressure data is brought into the computer interface on a continuous basis. Further, in accordance with this invention, in place of continuously using impulse switches on the drilling rig pumps for monitoring pump strokes or using straight time, a pumping pressure transducer sensing device to monitor mud pressure is inserted into the common pump output mud flow system. This information is loaded into the program of the computer 34 and the computer 34 is enabled to use fluctuating pump pressures from the pressure sensor 54 to track the annulus velocity and the corresponding lag throughout the full range of drilling fluid movement up the annulus However, a time base lag was inaccurate because it would not adjust to variable flow rates. Method and apparatus for monitoring fluid flow.Like this video? Therefore, the circuit 32 measures the pressure at the output of the mud pumps, uses the relationship between the pump pressure and annulus flow velocity for computing the lag and thus the depth at which the surface mud measurements originated.
The results from these calculations increase knowledge of well behavior and or casing; 4 Mud pump output; 5 Circulation or lag time; 6 Bit hydraulics Example: If a 10,ft-deep hole contains drilling fluid with a weight of .

the circulating system's surface equipment (such as the standpipe, kelly. the generation of mud logs and graphs during the drilling of the well, The mud logging unit is considered the information centre of the rig site as the This is calculated and is known as Lag time or lag strokes D. Calculating Lag in Strks.

Use of carbide for determining cuttings lag time while drilling Cuttings come up typically % slower than gas, but this depends on the rig conditions.

Video: Lag time calculation drilling machine How to Calculate Mud Tank Volume in Barrel - bbl

The rig Then calculate the length of cutting settling in the casing annular volume.
This automatic continuously adjusted drilling fluid lag method using computerized pump pressure is superior to the pump stroke method because.

In addition, the method includes measuring the depth of the drill bit and using the change in the depth measurement for adjusting the calculated lag time. Another object is wherein the measurement of a parameter of the drilling fluid includes measuring the amount of formation gas in the drilling fluid.

Borehole logging apparatus. At the well surface various characteristics of the return drilling fluid can be observed or measured such as the presence of formation gas, fluids and rock.

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 LOVENICH OVERLEDEN IN BAAL View all posts by DrillingFormulas.Unsubscribe from Waleed Fawzy? If there are changes in mud flow rate, the lag time figure will be changed as well. Bore hole apparatus for marking drilling mud. However, it is critical to know the well depth from which the gas, fluids and rock were released by the drill bit.

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In the time back-up mode, special function keys are activated to allow manual operation of the system until the pressure transducer is back on line. Another object is wherein the measurement of a parameter of the drilling fluid includes measuring the amount of formation gas in the drilling fluid.