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US 8,800,655 B1Granted
Stage cementing tool
OwnerMichael E. Baileyinventor
Life of this patent
Estimating the term…
Abstract
A mechanical stage cementing tool that includes a mechanical opening and closing seat sleeve and a pin sub. The mechanical stage cementing tool may be converted to a hydraulic stage cementing tool by inserting a hydraulic tube assembly into the mechanical opening and closing seat sleeve at a hydraulic modification area and by adding a hydraulic seat to the pin sub. The stage cementing tool has a running-in-hole position, an open position, and a closed position.
Claims20
A stage cementing tool comprising:
- a closing sleeve;
- an opening and closing sleeve shear means;
- an opening and closing seat sleeve having a running-in-hole position, an open position, and a closed position, wherein the opening and closing sleeve shear means holds the opening and closing seat sleeve above the closing sleeve such that a differential pressure area is created, wherein the opening and closing seat sleeve isolates port holes during the running-in-hole position when being lowered into a bore hole, wherein the opening and closing sleeve shear means shear after pressure is applied and allow the opening and closing seat sleeve to drop to the closing sleeve such that the opening and closing seat sleeve is in the open position and port holes are open, wherein the opening and closing seat sleeve is used as a mechanical opening and closing seat sleeve when a bomb is dropped into the bore hole and is used as a hydraulic opening and closing seat sleeve when a bomb is not dropped into the bore hole, and the same mechanical parts are used when the opening and closing seat sleeve operates as a mechanical opening and closing seat sleeve as when the opening and closing seat sleeve operates as a hydraulic opening and closing seat sleeve.
A method of casing a wellbore, the method comprising:
- inserting a stage cementing tool into a wellbore, wherein the stage cementing tool is in a running-in-hole position and the stage cementing tool comprises a closing sleeve and an opening and closing seat sleeve, wherein the opening and closing seat sleeve isolates port holes during the running-in-hole position when being lowered into a bore hole, wherein the same mechanical parts of the opening and closing seat sleeve are used when the opening and closing seat sleeve operates as a hydraulic opening and closing seat sleeve as when the opening and closing seat sleeve operates as a mechanical opening and closing seat sleeve,
- transitioning the stage cementing tool into an open position, wherein in the open position annular casing fluid can flow into an annular cavity in the wellbore;
- transitioning the stage cementing tool into a closed position, wherein in the closed position annular casing fluid cannot flow from the annular cavity back into the stage cementing tool;
- and
- drilling out at least a portion of the stage cementing tool such that the wellbore is cased.
2 more elements
A stage cementing tool comprising:
- a closing sleeve;
- an opening and closing sleeve shear means;
- and
- an opening and closing seat sleeve having a running-in-hole position, an open position, and a closed position, wherein the opening and closing sleeve shear means holds the opening and closing seat sleeve above the closing sleeve such that a differential pressure area is created inside the stage cementing tool, wherein the opening and closing seat sleeve isolates port holes during the running-in-hole position, wherein the opening and closing sleeve shear means shear after pressure is applied and allow the opening and closing seat sleeve to drop to the closing sleeve such that the opening and closing seat sleeve is in the open position and port holes are open, and wherein the same mechanical parts are used when the opening and closing seat sleeve operates as a mechanical opening and closing seat sleeve as when the opening and closing seat sleeve operates as a hydraulic opening and closing seat sleeve.
1 more element
Dependencies are inferred from the claim text.