## Drill Collar Weight Calculation Methods

Drill Collar Weight Calculation is not problematic to run. Basically, there are two methods for such calculations. In this article, we will discuss both methods and their differences. This article is a series of articles that provide a full guide for Drill String Design Calculations | Complete Guide Buoyancy Factor Method Number & Lengths Of …

## Drill Collar: Everything You Need To Know

A Drill Collar (DC) is a heavy, thick-walled steel tube with threaded connections cut (NB not welded) on both ends that we use in oilfield rigs. They are designed to withstand downhole conditions while under compression and tension. While designing BHA, Drilling engineers place DCs above the Drill Bit as DCs are the predominant component of the Drilling BHA. To select …

## Drill Pipes Collapse Pressure Formula

The Drill Pipe may sometimes be subjected to external pressure, which is higher than the internal pressure. This condition usually occurs during drill stem testing and may collapse the drill pipe. The differential pressure  (external pressure minus internal pressure) required to produce collapse is calculated for various sizes and grades of new and used drill pipe …

## API Drill Pipe Specifications SPECs & Tables

API Drill Pipe Specifications (specs) are generally described as six items. For example, a 5″ drill pipe is 5″, #19.5, E, XH, NC50, Premium. Now let’s understand what are the main items that describe any DP : 5” 19.5 Grade ”E” XH NC50 Premium tube OD Nominal Weight Minimum Yield strength Upset Tool Joint Connection …

## Drilling BHA Components and Design

Generally, the drilling bottom hole assembly (BHA) is one of the components of the Drilling String, which is below the Drill Pipes. The most common components of the BHA are drill collars, stabilizers, shock Absorbers, jars, reamers, heavy-weight drill pipes, and the drilling bit. The Bottom Hole Assembly BHA aims to drill a usable hole …

## Types Of Bottom Hole Assembly (BHA)

In this article, we will talk mainly about the application for different types of bottom hole assembly (slick BHA drilling, Pendulum Assembly, & Packed BHA), its design & components. This article is a part of our drill string design guide. In general, there are three types of Bottom Hole Assembly BHA In drilling: The Slick …

## Drilling Tendency Behavior For Bottom Hole Assembly

The purpose of the drilling bottom hole assembly BHA is to drill a useful vertical hole with full gauge, smooth bore and free of doglegs and ledges.From the below drawing which shows the simplest bottom hole assembly (slick assembly) which consists of a bit and drill collars and no stabilizers, you will notice the following: …

## Drilling Jar Types, Calculations & Operation

Drilling jars are one of the BHA components that should be run with the drill string to help free stuck pipes. There are two common types of drilling jars: hydraulic and mechanical. Hydraulic jars use the pressure the string generates to apply an impact load. In contrast, the mechanical type uses a spring-loaded design to create an impact load. This …

## Shock Absorber Sub In Drilling

A shock absorber sub or damper is a mechanical or hydraulic device designed to absorb and damp shock impulses while drilling. It does this by converting the kinetic energy of the shock into another form of energy (typically heat), which is then dissipated. Most shock absorber subs are a form of dashpot (a damper that …

## Drilling Reamer Types And Applications

Roller reamers are a unique tool used in drilling through tough rock formations. They’re designed to stabilize the drilling process and create a smooth, round hole. Rolling reamers have a very small contact area with the rock unlike other reaming tools. But don’t let their small size fool you. They’re actually the most effective tool …