Managed pressure drilling
First Claim
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1. A method of drilling a wellbore in a formation, comprising:
- drilling the wellbore using a tubular body;
circulating a foam through the tubular body and into an annulus between the outer diameter of the tubular body and the wellbore; and
maintaining a substantially homogenous foam flow regime in the annulus using one or more pressure control mechanisms.
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Abstract
Embodiments of the present invention include methods and apparatus for dynamically controlling pressure within a wellbore while forming the wellbore. In one aspect, one or more pressure control apparatus are used to maintain desired pressure within the wellbore while drilling the wellbore. In another aspect, pressure is dynamically controlled while drilling using foam to maintain a substantially homogenous foam flow regime within the wellbore annulus for carrying cuttings from the wellbore.
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Citations
55 Claims
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1. A method of drilling a wellbore in a formation, comprising:
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drilling the wellbore using a tubular body;
circulating a foam through the tubular body and into an annulus between the outer diameter of the tubular body and the wellbore; and
maintaining a substantially homogenous foam flow regime in the annulus using one or more pressure control mechanisms. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of changing pressure within a wellbore, comprising:
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forming the wellbore using a drill string;
circulating fluid into an annulus between an outer diameter of the drill string and a wall of the wellbore while forming the wellbore; and
selectively choking the fluid in the annulus, thereby changing a pressure profile of the fluid flowing in the annulus. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53)
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54. A method of forming a wellbore, comprising:
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inserting a tubular body into a wellbore formed in an earth formation;
circulating a foamed cement through the tubular body and into an annulus between the outer diameter of the tubular body and the wellbore; and
tailoring a density of the foamed cement along the annulus using one or more pressure control mechanisms. - View Dependent Claims (55)
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Specification