Product Details

drilling of oil and gas wells tools float shoe and float collar

description

A float shoe is used in the drilling of oil and gas wells. It is a single cylindrical piece that performs the functions of both afloatcollarand a guide shoe. Its main purpose is to guide drilling equipment to the bottom of the well without snagging, like a guide shoe. It also contains a check valve to allow fluids to pass in only one direction, like afloatcollar.

As operators drill a well, they line the hole with casing. The casing is a steel pipe of the same diameter as the hole. It prevents the walls of the hole from caving in during the drilling process. It also prevents fluid from seeping into the hole. In the event that petroleum is found at the drill site, the casing is used as a conduit to pump petroleum out of the well.

As each section of casing, or joint, is only 30 feet (9 meters) long, many are needed to reach the bottom of most wells. A series of casings screwed together is called a casing string. Thefloatshoe is screwed onto the bottom of the casing string to guide the casing to the bottom of the well. It prevents mud from entering the casing. It also helps the casing tofloatduring the descent, which decreases the load acting on the oil derrick and other topside drilling equipment.

The float shoe is a short cylinder made of steel. It is rounded at the bottom to allow easy insertion into the well hole. The cylinder is hollow in the middle to allow liquid to flow through. Most are equipped with check valves, which allow the liquid to flow in only one direction. This prevents water or mud from being forced upward through the casing.

Specification(in)		O.D.(mm)	Total length(mm)	I.D.(mm)	Min.Dia.(mm)	Conn Type	Affordable strength of back- pressure (Mpa)
Float Collar	5	141.3	500	110	50	5 BCSG	35
	5 1/2	153.67	530	112	55	5 1/2BCSG	35
	7	194.46	586	162.5	77	7 BCSG	35
	9 5/8	270	720	225	77	9 5/8 BCSG	35
	13 3/8	365	720	319	77	133/8 BCSG	35
	20	533.4	720	475	77	20 BCSG	35
Float Shoe	5	140.3	495	110	50	5 BCSG	35
	5 1/2	153.67	514	122	55	5 1/2 BCSG	35
	7	194.46	533	162.5	77	7 BCSG	35
	9 5/8	269.88	550	225	77	9 5/8 BCSG	35
	13 3/8	339.7	550	319	77	133/8 BCSG	35
	20	534	652	475	77	20 BCSG	35