What is rat hole in oilfield

A rathole is a hole in the rig floor, 30 to 35 feet deep, lined with casing that projects above the floor, into which the kelly is placed when hoisting operations are in progress. This is either done by the portable rig that drills the conductor hole or can be done by the primary rig after rigging-up.

What is the term mouse hole means in drilling?

The mousehole is the area on the drilling rig where the next joint of drilling pipe is stored. This is located between the rotary table and vee-door, and is usually fitted with a casing and bottom.

What is the difference between a mousehole and a rathole?

As nouns the difference between rathole and mousehole is that rathole is an entrance to a living area or passageway used by mice or rats while mousehole is a hole through which a mouse enters a room.

Where is the rat hole in a well?

-In the context of a well, a rat hole is the hole below the pay zone. Commonly drilled to drop off perforating guns of a gathering or sump area for liquids to separate from gas prior to being pumped.

What is Kelly in drilling rig?

A kelly drive is a type of well drilling device on an oil or gas drilling rig that employs a section of pipe with a polygonal (three-, four-, six-, or eight-sided) or splined outer surface, which passes through the matching polygonal or splined kelly (mating) bushing and rotary table.

What is Drawworks drilling?

A drawworks is the primary hoisting machinery component of a rotary drilling rig. Its main function is to provide a means of raising and lowering the traveling block. … The segment of drill line from the drawworks to the crown block is called the “fast line”.

What is the use of a mousehole?

The main function of the mousehole is to hold pipe during stand building or breakdown. Mouseholes are designed to use the area below the drill floor and are flush-mounted with the drill floor on installation.

Do mice really make holes in the wall?

Mice are capable of fitting through extremely small openings in floors, walls and foundations. After they enter homes, they can be extremely difficult to get rid of. Mice living within walls rarely leave their nests during daylight. … Holes are also visible in walls, floors, ceilings and foundations.

How do you know if a rat is in your room?

Squeaking or scurrying sounds in the walls.
Running or soft footstep sounds primarily at night.
Piles of droppings in an area behind a stove, in the basement or attic, or on the ground.
Food packages, containers or wooden spoons that have been gnawed on.

Why is a kelly bar called a Kelly bar?

Friction kelly bars are named such due to the frictional contact created between the rails of each element.

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What is the kelly bushing?

1. n. [Drilling] An adapter that serves to connect the rotary table to the kelly. The kelly bushing has an inside diameter profile that matches that of the kelly, usually square or hexagonal. It is connected to the rotary table by four large steel pins that fit into mating holes in the rotary table.

What is Rotary hose in drilling?

1. n. [Drilling] A large-diameter (3- to 5-in inside diameter), high-pressure flexible line used to connect the standpipe to the swivel. This flexible piping arrangement permits the kelly (and, in turn, the drillstring and bit) to be raised or lowered while drilling fluid is pumped through the drillstring.

What is the traveling block in drilling?

A traveling block is the freely moving section of a block and tackle that contains a set of pulleys or sheaves through which the drill line (wire rope) is threaded or reeved and is opposite (and under) the crown block (the stationary section).

How does a rotary table work on a drilling rig?

A rotary table is a mechanical device on a drilling rig that provides clockwise (as viewed from above) rotational force to the drill string to facilitate the process of drilling a borehole. Rotary speed is the number of times the rotary table makes one full revolution in one minute (rpm).

What is Travelling block derrick?

1. n. [Drilling] The set of sheaves that move up and down in the derrick. The wire rope threaded through them is threaded (or “reeved”) back to the stationary crown blocks located on the top of the derrick.

Does one rat mean more?

Yes, if you see one rat, there are probably many more living in your house, in the attic or walls. … Rats are social creatures by nature, and they breed very quickly, so if you spot a single rat, there is a reasonable chance that you have more than one. Look at photos of a nest of baby rats in the attic.

What do rats hate?

Rats have a powerful sense of smell. You can repel rats from your home and garden with scents they dislike, such as clover, garlic, onion, hot peppers containing capsaicin, house ammonia, used coffee grounds, peppermint, eucalyptus, predator (cat) scent, white vinegar, and citronella oil.

How long does it take to get rid of rats?

It generally takes roughly 3 days to one week to get rid of rats with rat poison. Mechanical traps can sometimes take a few days to trap rats because the rodents may be wary of the trap. A pest control professional can remove rats in as little as one day to a few days depending on the size of the infestation.

Whats a rat hole look like?

The entrance to rat holes is typically 2-4 inches in diameter. The entrance is smooth and well-packed and usually with a fan-shaped pattern of loose, fresh dirt just outside the entrance. This distinct pattern is created by the rats kicking out dirt.

How deep is a mouse hole?

How deep is a mouse hole? The tunnels are generally only a few centimetres below ground, with entrance holes about 3cm in diameter. Mouse holes are often camouflaged or blocked with debris, such as small stones, clods of earth or twigs.

What do you do if you find a mouse hole?

Fill small holes with steel wool and seal around the wool with caulk. Buy steel wool online or at a hardware store. Stuff the steel wool into the hole to cover it completely, then put caulk around the edges to keep the mice from simply pulling it out. Close larger holes with metal sheeting or cement.

What is master bushing?

A device that fits into the rotary table to accommodate the slips and drive the kelly bushing so that the rotating motion of the rotary table can be transmitted to the kelly.

What is doghouse in oil and gas?

1. n. [Drilling] The steel-sided room adjacent to the rig floor, usually having an access door close to the driller’s controls. This general-purpose shelter is a combination tool shed, office, communications center, coffee room, lunchroom, and general meeting place for the driller and their crew.

What does a blowout preventer do?

A blowout preventer, or BOP, is a large specialised unit weighing up to 400 tonnes that is used to prevent an oil spill from occurring. It works like a valve to close an oil well, similar to a plumber closing a valve in a pipe, and are proven to be highly effective in ensuring well safety.

What does Tvdss stand for?

TVDSS is True Vertical Depth SS. This is measured from mean sea level (MSL). It does not reference KB. Kelly Bushing (KB) is the height of the Derek (drill rig) measured from the MSL. The interpreter should manually enter the KB height under the well info tab (see Creating a New Well).

What is the difference between MD and TVD?

True Vertical Depth (TVD) is measured vertically from the surface down to a certain target down hole. Measured Depth (MD) is the total length of the wellbore measured along the actual well path.

What is total depth?

Total depth is the downward length of a well, measured by the length of pipe which is needed to reach the bottom. Total depth of a well is the vertical distance from the rig floor to the bottom of the hole.

What is top drive drilling?

A top drive is a mechanical device on a drilling rig that provides clockwise torque to the drill string to drill a borehole. It is an alternative to the rotary table and kelly drive. … The top drive allows the drilling rig to drill the longer section of a stand of drill pipe in one operation.