Coring system and method
First Claim
1. An assembly operable for a wellbore, said assembly comprising:
- a drill pipe tubular, said drill pipe tubular having a tubular outer diameter;
an upset portion of said drill pipe tubular extending radially outwardly with respect to said tubular outer diameter, said upset portion having an upset outer diameter ranging from five and one-half inches to six and one-half inches, said drill pipe tubular having an inner diameter ranging from three and three-quarter inches to four and three-quarter inches;
a threaded pin connection for said drill pipe tubular adjacent said upset portion, said threaded pin connection having an axial length ranging from two and three-quarters to three and three-quarters inches.
2 Assignments
0 Petitions
Accused Products
Abstract
A wellbore assembly is provided that is operable in wellbores in the range of six to six and one-half inches for obtaining large diameter cores, e.g., cores greater than or equal to two and seven-eighths inches in diameter. The wellbore assembly may preferably be utilized with drill pipe so that standard drilling rigs may be utilized in drilling and coring operations therewith. The drill pipe in accord with the present invention may be formed by modifying standard API drill pipe such as API four and one-half inch IF (Internal Flush) drill pipe in a special manner that renders the drill pipe still suitable for the type of drilling operations of interest and also suitable for handling by any drilling rig capable of using standard API drill pipe. Alternatively, the drill piper may be initially manufactured in accord with the specifications of the present invention. The coring tool preferably comprises an inner core barrel for receiving the core and, in a presently preferred embodiment, may be sized to obtain a core having an outer diameter from about three to three and one-half inches.
12 Citations
21 Claims
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1. An assembly operable for a wellbore, said assembly comprising:
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a drill pipe tubular, said drill pipe tubular having a tubular outer diameter;
an upset portion of said drill pipe tubular extending radially outwardly with respect to said tubular outer diameter, said upset portion having an upset outer diameter ranging from five and one-half inches to six and one-half inches, said drill pipe tubular having an inner diameter ranging from three and three-quarter inches to four and three-quarter inches;
a threaded pin connection for said drill pipe tubular adjacent said upset portion, said threaded pin connection having an axial length ranging from two and three-quarters to three and three-quarters inches. - View Dependent Claims (2, 3, 6, 7, 8, 9)
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- 4. The assembly of claim 4, wherein said inner core barrel has an inner diameter equal to or greater than three inches.
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10. A method for a wellbore system, comprising:
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providing a plurality of drill pipe tubulars having a minimum inner diameter greater or equal to four inches;
providing an upset permanently affixed to each of said drill pipe tubulars such that an outer diameter of said upset is greater than an outer diameter of said plurality of tubulars; and
providing a coring tool having an inner core barrel sized for receiving a core with an outer diameter of greater than or equal to two and seven-eighths inches. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. An assembly operable for drilling in a wellbore less than seven inches in diameter, comprising:
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a plurality of drill pipe tubulars threadably connectable together wherein each drill pipe tubular has a tubular outer diameter;
an upset for each of said drill pipe tubulars having a maximum outer diameter greater than said tubular outer diameter; and
each drill pipe tubular having an inner diameter greater than or equal to four inches. - View Dependent Claims (19, 20, 21)
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Specification