Table of Contents
How does a weight indicator work?
When the load cell is compressed, hydraulic fluid is forced through the load cell to the weight indicator by way of a high pressure hydraulic hose. Once the pressure reaches the indicator, the outer dial measures weight on bit, and the inner dial measures total hook load.
How is WOB drilling calculated?
Drill Collar Weight Calculation To Prevent Drill Pipe Buckling
- Drill collar weight in a vertical well.
- WDC = (WOB x SF) ÷ BF.
- Drill collar weight in a deviated well.
- WDC = (WOB x SF) ÷ (BF x COS (θ))
- Example: The deviated well has inclination of 30 degree in tangent section and planned mud weight is 12.0 ppg.
How much does a drill bit weigh?
For tooth bits, the weight can range from 1,000 to 4,000 pounds per inch of bit diameter. For tungsten carbide insert (TCI) button bits, this can increase to 6,000 pounds per bit inch.
What is Hookload in drilling?
1. n. [Drilling] The total force pulling down on the hook. This total force includes the weight of the drillstring in air, the drill collars and any ancillary equipment, reduced by any force that tends to reduce that weight.
How much weight can a drilling rig pull?
Rigs can range from 100 short tons (91,000 kg) continuous flight auger (CFA) rigs to small air powered rigs used to drill holes in quarries, etc. These rigs use the same technology and equipment as the oil drilling rigs, just on a smaller scale.
What is the weight of drill collar?
Drill Collar Availablility and Description
| Open PDF | OD (in) | Adjusted Weight (lb/ft) |
|---|---|---|
| 1 3/4 in | 31.54 lb/ft | Slick |
| View Spec | ||
| OD: 4 1/8 | ||
| 2 in | 34.35 lb/ft | Spiral |
How do you calculate the weight of a drill string?
Multiply the air weight by the buoyancy factor to calculate the drill pipe’s hook load. In the example, multiplying 250,000 by 0.6947 equals a hook load of 173,675 lbs. Subtract the hook load from the yield strength to calculate the overpull. In the example, 450,675 minus 173,675 equals an overpull of 276,325 lbs.
How do you determine the weight of a drill collar?
How is Hookload calculated?
What kind of weight indicator does a driller need?
Panel-mounted as an integral part of drillers’ consoles or box-mounted for portability, Forum hydraulic deadline Anchor-type Weight Indicators help the driller maintain consistent weight on bit for faster, more efficient, and more economical drilling. Models available for deadline loads of 30,000 to 200,000 pounds.
What kind of weight indicator does Dicks use?
Dicks Oilfield Instrument Sales & Service Inc.’ anchor type weight indicators are made to be accurate and durable. Our systems are compatible with all major dead line anchors. Our anchor type weight indicator systems operate using a compression or tension loadcell to display accurate, reliable measurements.
How does the Forum deflection weight indicator work?
Designed for use on small drilling units, the Forum Deflection-type Weight Indicator is easy to move from rig to rig. The Weight Indicator system consists of a Gauge and a Deadline Diaphragm, connected by a high-pressure Hose.
What do you need to know about Dicks oilfield instruments?
• Dicks Oilfield Instruments’ Deflection type weight indicator is ideal for use with small to medium drilling and workover rigs. • Unit is portable, rugged, and dependable. Ready to be placed on the drill line right out of the box. • The system comes with self-contained steel box.