The complete removal of the mud from the annulus (Mud Conditioning Simple Guide For Better Cementing) and its replacement with a good cement slurry is the major requirement for a good cement job. Cement placement is influenced by: Good cement placement can only be achieved when all parameters are optimally fulfilled. Single Stage Cement Jobs …
The cement evaluation is necessary for determining the zonal isolation and the top of cement. The position of the top of cement can be established in three ways: Comparison of the actual TOC with the intended TOC may give an indication that losses (Check also Mud Losses) (unexpectedly low TOC) or channeling (unexpectedly high TOC) …
Casing Tallies Versus Liner Tallies There are two different types of tubular tallies: 1) a casing tally spreadsheet and 2) a casing liner tally. A casing tally works from a fixed point at the wellhead (e.g. hanger landing point) and the formulae in the spreadsheet calculate the shoe depth by adding the length of each …
Pipe Washout in oil and gas is a sudden problem that may happen during any stage of drilling the well and may cause a parting of the string and the following fishing in drilling operations that will increase well time and cost. Drill Pipe Washouts Causes & Precautions As with all downhole problems, prevention is …
Casing repair is not exactly a drilling fishing job, but if the casing collapses, splits, or parts you’re fishing skills can help you repair the casing. Casing repair involves using a variety of tools downhole. Each casing failure must be evaluated based on the specific conditions of the failure before a method of repair can …
There are several methods for patching damaged casing while maintaining pressure ratings and without restricting internal bore diameters. The casing repair is made by removing the damaged section of the casing and then preparing the casing stub with a Dress-Off Mill. The external patch is run in the hole on the bottom of the new …
Coiled Tubing (CT) is a continuous length of small-diameter pipe that is spooled onto a reel in the same way as wire or cable is wrapped on a drum. The coiled tubing operation permits the technique of “snubbing” a continuous length of tubing in and out of a live well through a stripper BOP arrangement. …
At times, you will need to mill out collapsed casing and repair the casing using a casing alignment tool. You can also use a string mill and casing alignment tool to repair split casing. Bottom Hole Assembly The bottom hole assembly should contain, from bottom to top (connecting to drill collars): See the diagram below. …
A casing swage tool will typically repair the casing & restore collapsed casing to its original ID. Swages are also used to make gauge runs to ensure the casing size (ID) is clear. Tool Description Swages are made of 4140-grade heat-treated steel. The tool is shaped like an ice cream cone. The long tapered nose …
Use a casing roller when the casing is slightly collapsed. Casing rollers are light-duty tools. We recommend for you this article to read: Tool Description The CASING ROLLER is specifically designed for repairing casing and differs from any other repair tool intended for this application in that it does not include any small parts to …