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US 6,712,150 B1Granted
Partial coil-in-coil tubing
AssigneeBJ Services Company
InventorsJohn G. Misselbrook, Richard A. Altman, William G. Gavin, Alexander R. Crabtree
Life of this patent
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Abstract
A dual tubing coiled tubing string, including methods of assembly, that includes an inner tubing sealed within at least an upper portion of an outer tubing.
Claims40
A coiled tubing string, comprising:
- inner tubing within an outer coiled tubing;
- the inner tubing being less than or equal to eighty-percent 80% of the length of the outer tubing;
- the outside diameter of the inner tubing being greater than or equal to eighty-percent (80%) of the inside diameter of the outer tubing;
- and
- the inner tubing being sealed against the outer tubing at at least a lower portion of the inner tubing.
2 more elements
A coiled tubing string, comprising:
- an inner tubing within outer coiled tubing;
- and
- at least one spoolable seal located within the outer tubing at at least a lower portion of the inner tubing for sealing the inner tubing against the outer tubing.
A coiled tubing string, comprising:
- an inner tubing within outer coiled tubing;
- and
- a spoolable seal sealing the inner tubing against the outer tubing at at least a lower portion of the inner tubing, the seal structured to permit relative longitudinal motion between the inner tubing and the outer tubing.
A coiled tubing string, comprising:
- an inner tubing within and sealed against outer coiled tubing at at least a lower portion of the inner tubing;
- and
- a stop located upon an inner surface of the outer tubing, wherein the portion of the coiled tubing string with the inner tubing sealed against the outer coiled tubing is spoolable about a coiled tubing reel.
A coiled tubing string, comprising:
- inner tubing within outer coiled tubing;
- the inner tubing being less than or equal to 80% of the length of the outer tubing;
- the inner tubing connected to and sealed against the outer tubing at at least a lower portion of the inner tubing;
- and
- the connection between the inner tubing and the outer tubing structured to restrict relative longitudinal motion between the inner tubing and the outer tubing.
2 more elements
A protected coiled tubing string, comprising:
- an upper string portion including an inner tubing within an outer coiled tubing, the inner tubing sealed against the outer tubing at at least a lower portion of the inner tubing;
- and
- a lower string portion connected to the upper string portion, the lower portion including a single coiled tubing length.
A coiled tubing string, comprising:
- inner tubing within and sealed against outer coiled tubing at at least a lower portion of the inner tubing;
- and
- a stop located upon an inner surface of the outer tubing wherein the inner tubing is longitudinally compressed within the outer tubing against the stop.
A method for assembling a protected coiled tubing string, comprising:
- inserting an inner tubing within an outer coiled tubing, the inner tubing being less than or equal to 80% of the length of the outer tubing;
- and
- sealing at least a lower portion of the inner tubing against the outer tubing such that the seal lies within the outer tubing.
A method for assembling a coiled tubing string, comprising:
- attaching, a first coiled tubing length, having an inner tubing within an outer tubing and a sealed annulus defined between the inner tubing and the outer tubing, to a second single coiled tubing length to form a string.
A coiled tubing string, comprising:
- inner tubing within an outer coiled tubing;
- and
- means for sealing against fluid communication the inner tubing against the outer tubing at at least a lower portion of the inner tubing, wherein the means for sealing is spoolable about a coiled tubing reel.
A method for assembling a protected coiled tubing string, comprising:
- inserting an inner tubing within an outer coiled tubing;
- and
- providing a spoolable seal for sealing against fluid communication the inner tubing against the outer tubing.
A coiled tubing system for circulating fluids in a wellbore comprising:
- a coiled tubing string;
- a check valve attached to the coiled tubing string, the check valve having a fluid passageway therethrough and a biased flapper wherein the flapper is biased to close the fluid passageway to prevent fluid flow up through the check valve and into the coiled tubing string, the biasing force may be overcome to allow fluid flowed down the coiled tubing string and through the check valve;
- and
- a shiftable sleeve located in the fluid passageway of the check valve wherein the sleeve is shiftable from a first position where the sleeve prevents the flapper from closing the fluid passageway to allow reverse circulating through the valve and a second position where the biasing force may bias the flapper to close the fluid passageway.
1 more element
A method of circulating fluids through a coiled tubing string comprising the steps of:
- providing a cyclic check valve in the coil tubing string;
- positioning the coil tubing string in a wellbore wherein an annulus is created about the outer diameter of the coiled tubing string;
- circulating fluid down the annulus and up through the check valve and into the coiled tubing string;
- and
- cycling the check valve to prevent fluid flow from flowing up through the valve and into the coiled tubing.
2 more elements
A coiled tubing assembly for circulating fluid in a wellbore comprising:
- a coiled tubing string, the string having a first end attached to a reel and a distal end for lowering into the wellbore;
- a cyclic check valve attached proximate to the distal end of the coiled tubing string, the check valve having a fluid passageway therethrough and a valve closure means for preventing fluid flow up through the fluid passageway of the check valve and into the coiled tubing string;
- and
- a means for activating the valve closure means.
1 more element
Dependencies are inferred from the claim text.