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Join Date: Dec 2017
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Drilling Bits

12/02/2017 1:10 AM

In the oil and gas industry, a drill bit is a tool designed to produce a generally cylindrical hole (wellbore) in the earth’s crust by the rotary drilling method for the discovery and extraction of hydrocarbons such as crude oil and natural gas. This type of tool is alternately referred to as a rock bit, or simply a bit. The hole diameter produced by drill bits is quite small, from about 3.5 inches (8.9 cm) to 30 inches (76 cm), compared to the depth of the hole, which can range from 1,000 feet (300 m) to more than 30,000 feet (9,100 m). Subsurface formations are broken apart mechanically by cutting elements of the bit by scraping, grinding or localized compressive fracturing. The cuttings produced by the bit are most typically removed from the wellbore and continuously returned to the surface by the method of direct circulation.

TYPES OF DRILLING BITS
Rolling Cutter Bits
1- Bit Design:

2- Bit Classification
3- Running Procedures
4- Bit Performance

Fixed Cutter Bits

1- PDC Bit Design :

2- Classification Of Fixed-Cutter Bits
3- Running Procedures
4- PDC Bit Operating Parameters
5- PDC Bit Drilling Parameters
6- PDC Bit Performance
7- Bit Application
BIT DULL GRADING
Dull bit grading is a standard method to grade the bit and it will also help personnel to understand bit performance better. However, it is sometimes very difficult to understand the meaning of the codes showing in the grading because you’ve never seen these dull characteristics before. Especially, there are new people who start to work in the oilfield therefore it is very critical to have them learn the correct way to do the bit grading in a short period of time.

DRILL OFF TEST
is a method of determining optimum weight on bit and overall bit performance. A given amount of weight is put on the bit and the drawworks brake is tied off so that no more weight is applied to the bit as it drills. The time it takes for the bit to stop drilling ahead with the given amount of weight is measured. Different weights are applied and the times are compared to determine which amount is best.

FACTORS AFFECTING PENETRATION RATE
The penetration rate that can be achieved by a bit has an inverse effect on the drilling cost per foot. The main factors that affect penetration rate are

  • bit type
  • formation properties
  • drilling fluid properties
  • bit weight and rotary speed
  • bit hydraulics

For more details visit below
http://drilling-manual.blogspot.com....ling-bits.html

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Guru
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#1

Re: Drilling Bits

12/06/2017 9:13 AM

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Guru
United Kingdom - Member - New Member

Join Date: Aug 2010
Location: Resting under the Major Oak
Posts: 4269
Good Answers: 176
#2

Re: Drilling Bits

12/06/2017 9:14 AM

Spam

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