Oil well casing centralizer coupling
OwnerKenneth A. Bystedtinventor
Life of this patent
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Abstract
A threaded coupling that has a pair of threaded ends. A number of rigid centralizer ribs are attached or formed on the coupler. Because the coupler has a small length, a special wrench-adapter is used to attach the coupler to the casing string. This adapter fits around the coupler and allows an ordinary wrench to hold the coupler while the casing string is being made up. The coupling also has a gas seal to contain natural gas within the casing without allowing leakage and a torque limiter to ensure that the coupler does not destroy the casing when the casing is rotated in the earth.
Claims17
An oil well casing centralizer, comprising:
- a) a threaded coupling having an outer surface having a length, a pair of axially aligned ends jointed by a hollow passageway and having coupling threads adjacent to each of said pair of axially aligned ends;
- b) a plurality of rigid centralizer ribs fixedly attached to the outer surface of said oil well casing centralizer, whereby said plurality of ribs extends over the length of said outer surface such that there is no wrench-gripping surface on said outer surface of said oil well casing centralizer;
- and
- c) whereby the plurality of ribs are formed in a helical pattern about said outer surface of said oil well casing centralizer.
An oil well casing centralizer, comprising:
- a) a threaded coupling having an outer surface having a length, a pair of axially aligned ends jointed by a hollow passageway and having coupling threads adjacent to each of said pair of axially aligned ends;
- b) a plurality of rigid centralizer ribs fixedly attached to the outer surface of said oil well casing centralizer, whereby said plurality of ribs extends over the length of said outer surface such that there is no wrench-gripping surface on said outer surface of said oil well casing centralizer;
- c) a wrench adapter, adapted for use with said oil well casing centralizer;
- said wrench adapter including:
- i) a pair of semi-cylindrical members;
- ii) a hinge for hingably joining said pair of semi-cylindrical members together;
- iii) an inside surface, having a plurality of rib bodies, whereby said plurality of rib bodies is configured to interconnect with said plurality of ribs on said oil well casing centralizer;
- iv) a smooth, wrench gripping outer surface;
- and
- v) a means for locking said wrench adapter around said oil well casing centralizer.
A method of using an oil well casing centralizer comprising the steps of:
- a) coupling at least two tubular casing sections operatively together with a hollow centralizer, said hollow centralizer having a plurality of ribs and no wrench gripping surface, to form a casing;
- b) using a wrench adapter to attach said hollow centralizer into said casing;
- c) inserting said casing into a bore hole, said bore hole having a bore hole inner diameter;
- and
- d) inserting a quantity of cement between said casing outer diameter and said bore hole inner diameter by flowing said cement through said plurality of ribs and along said casing.
Dependencies are inferred from the claim text.