How do you calculate strokes from surface to bit?
6 min read
Asked by: Adam Grenier
Strokes – Surface to Bit Strokes
- Now let’s calculate Surface to Bit Strokes.
- The general formula to calculate Surface to Bit Strokes is as follows:
- Surface to bit strokes = drill string volume bbls / pump output in bbl/stk.
- Step 1 is to calculate Drill String Volume –
How do you calculate pump stroke?
Pump Output Calculation for Duplex Pump and Triplex Pump
- Triplex Pump Output = 0.000243 × (Liner Diameter ) 2 × (Stroke Length) Where, …
- Triplex Pump Output = 2.3576 × 10–9× (Liner Diameter ) 2 × (Stroke Length) Where, …
- Duplex Pump Output = 0.000162 × S × [2(D)2 – d2] …
- Duplex Pump Output =1.57172 × 10–9 × S × [2(D)2 – d2]
How do you calculate bottom up time?
Bottoms up time with one pump operating at 110 SPM is equal to the total annular capacity (drill string in the hole) divided by the pump output in barrels per minute.
What is closed end displacement?
Closed-End Pipe – Displacement, as related to drill pipe, drill collars and tubulars is the volume of fluid that the pipe will displace if placed into fluid with the lower end closed to allow no fluid inside.
What is pump stroke?
The number of strokes the polished rod completes in one minute. This determines the rate at which liquid is pumped. If the number of strokes per minute is increased, the pump rate is also increased. This term is also referred to as stroke speed.
How do you calculate bbl per stroke?
PO, bbl/stk = 0.000243 x f1! ner . ) x (stroke .
How do you calculate barrels per foot?
How to Find the Volume of a Barrel
- volume = h × π × ((2 × r22) + r12) 3.
- To get the total volume in cubic feet, convert from cubic inches using the formula ft3 = in3 × 0.000578704. …
- Gallons can be found using the cubic feet to gallons formula: …
- gallons = h × π × ((2 × r22) + r12) 3 × 7.480507.
What does bottoms up mean in drilling?
1. n. [Drilling] The sample obtained at the bottoms-up time or a volume of fluid to pump, as in “pump bottoms-up before drilling ahead.” 2. adj. [Drilling] Pertaining to the mud and cuttings that are calculated or measured to come from the bottom of the hole since the start of circulation.
How do you calculate strokes per minute?
How to Determine Strokes Per Minute
- Have a friend or coach time how long it takes you to perform three strokes, using a stopwatch. …
- Divide the number three by the time it took you to take three strokes. …
- Multiply the dividend by 60 to get your strokes per minute.
What is stroke length on a pump?
For changes in the piston travel, or stroke length, a mechanical adjustment within the pump is used. In order to change stroke speed (frequency), some form of variable speed drive is used to change the rotation speed of the drive motor, for example a DC-SCR drive, or an AC VFD.
What is stroke adjustment?
Stroke adjustment mechanisms are used to control the output of a reciprocating pump by changing the length of the plunger or piston stroke. There are two different types of stroke adjustment mechanisms: lost motion and full motion. The present invention is the full motion type of stroke adjustment mechanism.
How do you change the stroke length on a dosing pump?
The plunger stroke length is adjusted by turning the hand wheel (21). The adjusting unit changes the eccentricity of the connecting rod (10) and so the plunger stroke length. The stroke length can be altered both with the metering pump stopped or running.
What is a chemical metering pump?
Chemical metering pumps dispense liquids at precise rates. Also known as dosing pumps, they can handle harsh and hazardous fluids such as bases, slurries, and corrosives. Chemical metering pumps dispense liquids at precise rates.
Are diaphragm pumps positive displacement?
A diaphragm pump (also known as a Membrane pump) is a positive displacement pump that uses a combination of the reciprocating action of a rubber, thermoplastic or teflon diaphragm and suitable valves on either side of the diaphragm (check valve, butterfly valves, flap valves, or any other form of shut-off valves) to …
What is difference between positive and non positive displacement pump?
A positive displacement pump provides a constant flow at fixed speed, regardless of changes in pressure.
Difference between a positive and non-positive displacement pump.
| Positive Displacement Pumps | Non-Positive Displacement Pumps | |
|---|---|---|
| Pressure | Work in high pressure applications, up to 800 bar | Used for low pressure application, maximum pressure of 18 to 20 bar |
Why positive displacement pumps are self priming?
A Positive Displacement Pump will usually self-prime due to the very small clearances which exist within the pump. This will help it pull a vacuum and thus expel the air through the pump until the liquid reaches the pump.
Are diaphragm pumps self priming?
Diaphragm Pumps Are Self-Priming
Unlike some other pumping technologies, AODD pumps are self-priming and don’t require positive inlet pressure to prime (flooded or needing a dry suction lift).
How high can a diaphragm pump lift?
between 8 to 15 feet
A safe, average range would be between 8 to 15 feet (2.44 to 4.57 meters) depending on the pump’s elastomers.
What happens if you dont prime a pump?
Priming maintains the pump’s functionality because water, or the pumped fluid, acts as a coolant which prevents the pump from overheating. If you don’t fill the pump with fluid, it will run dry, which leads to mechanical seal failure or damage to the pump’s components.
Which pump must always be primed?
In short, to avoid failures, centrifugal pumps must always be primed before operating. Positive displacement pumps are self-priming with suction lift capability, but always check the operation manual or confer with an engineer to ensure the pump will properly function at start up without priming first.
What is pump cavitation?
Pumps are designed to pump liquids but, when the combined flow rate and pressure are inadequate or not conducive to the type of liquid being pumped, pockets or cavities can form, resulting in cavitation. Some describe pump cavitation as the creation and collapse of the air bubbles in a fluid.
Which type of pump never requires priming?
Priming is not required when pump is submerged (Submersible or Vertical Sump Pumps). Priming is not required when the pump is at a lower elevation than the supply and this ensures that pump suction will be completely filled with liquid at all times (known as “Flooded Suction Condition”).
Is foot valve required for self-priming pump?
Self-Priming Pumps have no need for external priming or foot valves.
What happens when too much flow is allowed through a pump?
Pumping other substances such as hot water or hydrocarbons may cause damage to the pump if flow is restricted too much. Pumping some materials such as blood may be sensitive to impeller RPM. Other products such as concrete or peanut butter may be sensitive to pressure.
Can self priming pumps run dry?
Even a ‘self-priming’ centrifugal pump will not operate when dry. With appropriate bearings and seals, a centrifugal pump can tolerate dry running for a limited time but this is not recommended for extended periods.
