Hard Bottom Cement Seal For Improved Well Control
AssigneeSchlumberger Technology Corporation
InventorGary L. Rytlewski
Life of this patent
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Abstract
Methods include introducing a casing into a wellbore penetrating a subterranean formation, the casing forming an annulus with the wellbore surface, where the casing is subject to a first pressure value at a distal end and a second pressure value at a proximal region within the casing, and where a shoe is positioned at the distal end of the casing. Then, placing a sealable valve within the proximal region of the casing, injecting a first cement composition into the casing, through the sealable valve and shoe, and into the annulus, and the placing a second cement composition in a medial region of the tubular formed between the distal end and the proximal region. Afterward, the sealable valve is closed.
Claims26
An apparatus comprising:
- a. a tubular subject to a first pressure value at a distal end and a second pressure value at a proximal region within the tubular;
- b. a shoe disposed within the distal end of the tubular;
- c. a sealable valve disposed within the proximal region within the tubular;
- and,
- d. a cement composition contained within a medial region of the tubular formed between the distal end and the proximal region.
(canceled)
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A method comprising:
- a. introducing a casing into a wellbore penetrating a subterranean formation, the casing forming an annulus with the wellbore surface, wherein the casing is subject to a first pressure value at a distal end and a second pressure value at a proximal region within the casing, and wherein a shoe is positioned at the distal end of the casing;
- b. placing a sealable valve within the proximal region of the casing;
- c. injecting a first cement composition into the casing, through the sealable valve and shoe, and into the annulus;
- d. placing a second cement composition in a medial region of the tubular formed between the distal end and the proximal region;
- and,
- e. closing the sealable valve.
(canceled)
(canceled)
A method comprising:
- a. introducing a tubular into an open hole wellbore penetrating a subterranean formation, the tubular forming an annulus with the open hole wellbore surface, wherein the tubular is subject to a first pressure value at a distal end and a second pressure value at a proximal region within the tubular, and wherein a shoe is positioned at the distal end of the tubular;
- b. placing a sealable valve within the proximal region of the tubular;
- c. injecting a cement composition into the casing, through the sealable valve and shoe, and into the annulus;
- and,
- d. closing the sealable valve.
(canceled)
(canceled)
Dependencies are inferred from the claim text.