Pre-running procedures Always pre-plan Ensure proper layout on the rig rack Joints need to be laid out properly especially when dealing with different weights of casing in one run. Clean the threads. Once the thread protectors are removed the threads should be cleaned. The tubular interiors should be inspected. Handling procedures Use thread protectors Use … Continue reading Running Casing
Tag: Drilling Fluids
A Guide to Reaming
Always Plan your tripping schedule: Record tight spots from previous trips Know the wellbore geometry; the deviation, doglegs etc. maintain constant communication with your directional personnel. Despite pulling up always be prepared to run downward. This may be needed to free the pipe after a connection. One example is the consistent execution of 200 to … Continue reading A Guide to Reaming
A Guide to Hole Cleaning
Hole cleaning is an essential part of drilling. It ensures that the material that is drilled is effectively and efficiently being removed from the wellbore. Failure to achieve proper hole cleaning can result in a host of wellbore problems and issues. Indications of poor hole cleaning: Excessive pull on trips High rotary torque Lowered rate … Continue reading A Guide to Hole Cleaning
Chemical Treatment of Drilling Fluids
Chemical treating agents reduce flocculation in clay water drilling fluids by one of more of the following mechanisms; Removal of contamination be precipitation Reducing the contaminant effect by sequestering the contaminant Neutralizing flocculation by satisfying cationic charges on the clay particles Forms a protective film around the clay particles Phosphates Powerful anionic dispersants, only … Continue reading Chemical Treatment of Drilling Fluids
Types of Clays
The first type is needle spaded non-swelling clays eg. Attapulgite or sepiolite. The shape of the clay allows it to build viscosity. As a result of their shape and poor swelling characteristics they don’t exhibit poor filtration control. Attapulgite is used primarily as a viscosity builder in saltwater fluids. Sepiolite is used as a supplemental … Continue reading Types of Clays
Drilling Fluids: Suspend and Release Cuttings
The mud must trap the cuttings while drilling but at the same time it must allow the solids control equipment to be able to remove the drilled solids. If cuttings settle out during the drilling process then this may bridge the well bore and cause problems. Also if the fluid is not designed properly then … Continue reading Drilling Fluids: Suspend and Release Cuttings
Drilling Fluids: Cuttings Removal
As the cuttings are drilled they must be removed and brought to the surface through the annulus. The removal of the cuttings is a function of the size, shape and density in combination with the rate of penetration (ROP), drill string rotation, viscosity, density and annular velocity of the drilling fluid. Viscosity - higher viscosities … Continue reading Drilling Fluids: Cuttings Removal