Fishing operations may be needed at any point during the life of a well— from drilling through abandonment. During the drilling phase, most fishing jobs are unexpected and are often caused by mechanical failure or by sticking of the drillstring. Sticking may also occur during wireline logging or testing operations.
What is fishing in drilling?
In oil-field operations, fishing is the technique of removing lost or stuck objects from the wellbore. The term fishing is taken from the early days of cable-tool drilling.
What are fishing operations?
In technical terms, a fish can be any object which has been lost or stuck in a borehole, and has a serious negative impact on well operations. To solve this issue, fishing involves the use of special tools and procedures to recover the fish and allow drilling to continue. …
What are the drilling operations?
Drilling is a cutting process that uses a drill bit to cut a hole of circular cross-section in solid materials. The drill bit is usually a rotary cutting tool, often multi-point. The bit is pressed against the work-piece and rotated at rates from hundreds to thousands of revolutions per minute.
What is open hole fishing?
Open hole fishing involves the removal of unwanted objects from the wellbore. The objects can be tools, equipment, and broken pieces of drill, pipe, bits or tribunals. Open hole fishing begins following a backoff and a drill string at or above the stock point of the fish in the wellbore leaving an accessible fish top.
What are fishing tools?
Fishing tackle is the equipment used by anglers when fishing. Almost any equipment or gear used for fishing can be called fishing tackle. Some examples are hooks, lines, sinkers, floats, rods, reels, baits, lures, spears, nets, gaffs, traps, waders and tackle boxes.
What is wash pipe in drilling?
1. A short length of surface-hardened pipe that fits inside the swivel and serves as a conduit for drilling fluid through the swivel. Sometimes used to mean washover pipe. …
What are fishing tools oil and gas?
A general term for special mechanical devices used to aid the recovery of equipment lost downhole. These devices generally fall into four classes: diagnostic, inside grappling, outside grappling, and force intensifiers or jars.
Is drilling dangerous?
Having an offshore job is a great way to make a living, but it doesn’t come without risks. Drilling operations offshore are extremely dangerous. Hazardous and dangerous conditions are just part of the job. These conditions include inclement weather, hazardous materials, flammable products, and heavy equipment.
How many types of drilling are there?
There are many different types or configurations of drilling machines, but most drilling machines will fall into four broad categories: upright sensitive, upright, radial, and special purpose.
What are the two most common types of drilling methods?
Five Most Common Drilling Methods Used in Oil and Gas Exploration
- Percussion or Cable Drilling.
- Rotary Drilling.
- Dual-Wall Reverse-Circulation Drilling.
- Directional Drilling.
How does a bumper sub work?
A percussion tool run on a fishing string to jar downward or upward on a stuck fish to knock it free. The bumper sub body moves up and down on a mandrel.