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Slotted liner drilling




Title: Slotted liner drilling.
Abstract: Drilling assemblies, systems and methods enable a wellbore to be drilled and lined with a slotted liner. A drilling system includes a liner assembly with a drill string in a bore thereof. The drill string and the liner assembly can be selectively coupled together to restrict relative motion between the liner assembly and the drill string. The liner assembly includes a slotted liner portion through which fluid may flow. As the drilling system is used to drill a wellbore, the liner assembly is simultaneously positioned within the wellbore. Once the wellbore is drilled to a desired depth, the drill string can be disengaged from the liner assembly and retrieved from the well. Production fluids such as oil and gas may then be transferred uphole through the liner assembly. ...


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USPTO Applicaton #: #20140238748
Inventors: Bill B. Dubose, Henry Foy, Matthew D. Flach, Joshua A. Blankenship, Austin C. Groover, Russell A. Wagstaff


The Patent Description & Claims data below is from USPTO Patent Application 20140238748, Slotted liner drilling.

CROSS-REFERENCE TO RELATED APPLICATIONS

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This application claims priority to, and the benefit of, U.S. Patent Application Ser. No. 61/768,890, filed on Feb. 25, 2013, and entitled “SLOTTED LINER DRILLING”, which is expressly incorporated herein by this reference in its entirety.

BACKGROUND

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A well may be formed to extract natural resources such as oil, gas, water, minerals, and the like. Such wells may be formed by drilling using drill pipe up to a certain depth, after which the drill pipe is removed and casino, is run and cemented in the well. The operator may then drill the well to a greater depth with drill pipe, and cement another string of casing in place. In this type of system, each string of casing may extend to a wellhead assembly at the surface of the well.

In some well completions, an operator may install a liner rather than another string of casing. The liner is made up of joints of pipe in the same manner as casing, and the liner is also cemented into the well. The liner, however, does not extend back to the wellhead assembly at the surface. Instead, the liner is attached to a liner hanger coupled to the last string of casing just above the lower end of the casing. The operator may later install a tieback string of casing that extends from the wellhead downward into engagement with the liner hanger assembly.

When installing a liner, the operator may dull the well to the desired depth, retrieve the doll string, then assemble and lower the liner into the well. A liner top packer may also be incorporated with the liner hanger. A cement shoe with a check valve may be attached to the lower end of the liner as the liner is made up. When the desired length of liner is reached, the operator may attach a liner hanger to the upper end of the liner, and attach a running tool to the liner hanger. The operator may then run the liner into the well on a string of drill pipe that is attached to the running, tool. Thereafter, the operator may set the liner hanger and pinup cement through the drill pipe, down the liner, and back up an annulus surrounding the liner. The cement shoe limits or prevents the flow of cement back into the liner. The running tool may dispense as wiper plug following the cement to wipe cement from the interior of the liner at the conclusion of the cement pumping. When a liner top pack is used, the operator may then set the liner top packer, release the running tool from the liner hanger, and retrieve the drill pipe.

SUMMARY

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According to an embodiment of the present disclosure, a drilling system may include a litter assembly that has a central bore formed therethrough. The liner assembly may include a slotted liner portion having a plurality of slots formed therethrough. The drilling system may also include a drill string disposed at least partially within the central bore of the liner assembly, such that an annulus may be formed between the liner assembly and the drill string. The drill string may be selectively engageable with the liner assembly.

In another embodiment of the present disclosure, a method of drilling may include drilling a wellbore to a pre-determined depth using a slotted liner drilling assembly. The slotted liner drilling assembly may include a drill string engaged with a liner assembly. The method may further include disengaging the drill string from the liner assembly and removing the drill string from the wellbore.

A method of drilling according to another embodiment of the present disclosure may include engaging a liner assembly with a drill string. An annulus may be formed between the liner assembly and the drill string. The method of drilling may also include drilling a wellbore with the drill string engaged with the liner assembly, circulating drilling fluid downhole through the drill string, and circulating the drilling fluid uphole through the annulus.

This summary is provided to introduce some features and concepts that are further developed in the detailed description. Other features and aspects of the present disclosure will become apparent to those persons having ordinary skill in the art through consideration of the ensuing description, the accompanying drawings, and the appended claims. This summary is therefore not intended to identify key or essential features of the claimed subject matter, nor is it intended to be used as an aid in limiting the scope of the claims.

BRIEF DESCRIPTION OF DRAWINGS

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FIG. 1 is a side view of a liner assembly in accordance with one or more embodiments of the present disclosure.

FIG. 2 is a side view of a drill string in accordance with one or more embodiments of the present disclosure.

FIG. 3 is a partial cross-sectional view of the liner assembly of FIG. 1 engaged with the drill string of FIG. 2, according to one or more embodiments of the present disclosure.

FIG. 4 is a cross-sectional schematic view of the liner assembly of FIG. 1 engaged with the drill string of FIG. 2, according to one or more embodiments of the present disclosure.

FIG. 5 is a flow chart of a method of drilling according to one or more embodiments of the present disclosure.

DETAILED DESCRIPTION

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One or more embodiments of the present disclosure are directed to drilling apparatuses, methods, and systems for drilling a wellbore, while simultaneously installing a slotted liner in the wellbore. More particularly, some embodiments of the present disclosure are directed to drilling apparatuses, methods, and systems to allow a wellbore to be drilled with a slotted liner, such that the slotted liner may not be installed in a separate process following drilling of the wellbore.

One or more embodiments of the present disclosure may further be directed to a slotted liner drilling assembly. A slotted liner drilling assembly may be used to drill a wellbore while also positioning a slotted liner at a predetermined depth within the wellbore. In one or more embodiments, the slotted liner drilling assembly may include a slotted liner and a drill string. For example, drill string may be run into the wellbore, and may even drill the wellbore, while a slotted liner is simultaneously run into the wellbore. The drill string may be positioned within the slotted liner. In some embodiments, the slotted liner is disposed around the drill string in a manner that allows torque, axial force, weight, and other forces encountered during the drilling process to be borne primarily by the drill string and not the slotted liner. Because the torque, axial force, weight, and other forces encountered during drilling are borne primarily by the drill string, the slotted liner may be positioned in the wellbore during the drilling process, which may reduce the time for drilling the wellbore and commencing production.

For example, a slotted liner drilling assembly according to embodiments of the present disclosure may reduce the time for drilling the wellbore and beginning production by removing a process of separately running a slotted liner into the wellbore after the wellbore has been drilled and the drill string has been removed from the wellbore. In one or more embodiments, once the production section of the wellbore is drilled, the drill string may be disengaged from the slotted, liner, and the slotted liner may remain in the wellbore after a single drilling run. Having the slotted liner and/or casing downhole may also be useful during swelling or sloughing of the formation to facilitate maintaining the wellbore shape, integrity, or quality.

Referring to FIG. 1, a liner assembly 100 is shown in accordance with an embodiment of the present disclosure, in such an embodiment, the liner assembly 100 may include one or more casing sections and one or more slotted liner portions, as will be discussed in greater detail herein. The liner assembly 100 may have a bore 123 (see FIG. 3) formed therethrough. In at least some embodiments, the bore 123 may be a central bore aligned with a central or longitudinal axis of the liner assembly 100, although in other embodiments the bore 123 may be offset from, or angled relative to, the central or longitudinal axis of the liner assembly 100. According to some embodiments, the bore 123 may render the liner assembly 100 or a component thereof) substantially hollow. In one or more embodiments, the liner assembly 100 may be configured to receive a drill string 110 at least partially through or within the bore 123.

In one or more embodiments, the liner assembly 100 may include one or more segments of casing 101. The segments of casing 101 may be tubular structures that are generally cylindrical in shape. In the illustrated embodiment, a segment of casing 101 is illustrated at the upper portion of the liner assembly 100. In other embodiments, a liner assembly 100 may include one or more segments of casing 101 at an intermediate or lower portion of the liner assembly 100. Similarly, in some embodiments, a liner assembly 100 may include one or more segments of casing 101 at both the upper portion and the lower portion of the liner assembly 100, at multiple intermediate portions, or at one or more intermediate portions and one or more of the upper or lower portions of the liner assembly 100. In one or more embodiments, the segments of casing 101 may extend from the surface. For instance, the segments of casing, 101 may extend to a casing profile nipple discussed in greater detail herein.

The one or more segments leasing 101 may be used (e.g., by an operator at the surface of the wellbore) to apply torque or axial force to the liner assembly 100. Further, in one or more embodiments, the one or more segments of casing 101 may be used to line and case the wellbore to increase structural rigidity and integrity, or isolate portions of the wellbore, after the wellbore has been drilled. In one or more embodiments, the one or more segments of casing 101 may be coupled together or engaged by way of couplings (e.g., threaded connectors). The one or more segments of casing 101 may be formed from carbon steel, stainless steel, aluminum titanium, fiberglass, composite materials, other materials, or a some combination of the foregoing. In one or more embodiments, the one or more segments of casing 101 may replace or supplement drill pipe that may be used for a drilling operation.

According to some embodiments of the present disclosure, the liner assembly 100 may include a casing profile nipple 102. The casing profile nipple 102 may be used to couple a segment of casing 101 to a perforated liner portion 103. For instance, a first end of the casing profile nipple 102 may be coupled to a segment of casing 101 and a second end of the casing profile nipple 102 may be coupled to the perforated liner portion 103. The connections between the segment of casing 101 and the casing profile nipple 102 and between the casing profile nipple 102 and the perforated liner portion 103 may take a variety of forms. For instance, the connections may be made by threaded interfaces, mating interfaces, welding, interference or friction fits, any other suitable mechanism, or some combination of the foregoing.

The casing profile nipple 102 may be configured for selective and secure engagement with a drill lock assembly of a drill string 110 (e.g., drill lock assembly 111 of FIG. 2), as discussed in greater detail herein. The casing profile nipple 102 may include one or more slots, grooves, tabs, or other features on an interior surface such that engagement with a drill string 110 may allow torque, axial force, or weight applied, to the liner assembly 100 to be transferred to the drill string 110. For example, in one or more embodiments, the casing profile nipple 102 may include one or more slots or grooves formed on an inner surface of the casing profile nipple 102, and the drill string 110 may include one or more tabs or splines for engaging the slots or grooves.

In one or more embodiments, an inner diameter of the casing profile nipple 102 may cooperate with an outer diameter of a portion of the drill string 100 (e.g., a drill lock component or assembly). For instance, the inner diameter of the casing profile nipple 102 may be substantially identical, slightly larger than, or otherwise correspond to the outer diameter of a drill lock assembly or other portion of the drill string 110. The corresponding diameters may allow for selective engagement between the casing profile nipple 102 and at least a portion of the drill string 110, and may result in secure engagement between the casing profile nipple 102 (and thus the liner assembly 100) and at least a portion of the drill string 110. The secure engagement between the casing profile nipple 102 and the drill string 110 may link together the motions of the casing profile nipple 102 (and thus the liner assembly 100) and the drill string 110. For instance, axial movement of the casing profile nipple 102 may result in or be associated with axial movement of the drill string 110, and vice versa. Similarly, rotational movement of the casing profile nipple 102 may result in or be associated with axial movement of the drill string 110, and vice versa. Thus, coupling the casing profile nipple 102 to the drill string 110 may restrict and potentially prevent relative axial and/or rotational motion between the liner assembly 100 and a drill string 110 located therein.

As noted above and as shown in FIG. 1, a liner assembly 100 of embodiments of the present disclosure may include a perforated liner portion 103. The perforated liner portion 103 of FIG. 1 includes a plurality of slots 104 formed therethrough. More particularly, the plurality of slots 104 may be a plurality of perforations, openings, gaps, or spaces formed through one or more walls of the perforated liner portion 103, and may provide for fluid communication between the bore 123 (see FIG. 3) and an outer annulus around the exterior of the liner assembly 100. Thus, fluid may pass from an outer surface of the liner assembly 100 through the slots 104 of the liner assembly 100 and to an inner surface of the liner assembly 100, and/or vice versa. In one or more embodiments, the plurality of slots 104 in the perforated liner portion 103 may be used to filter a formation fluid during production. In the same or other embodiments, the plurality of slots 104 may limit and control an amount of sand that may pass through the liner assembly 100 with a formation fluid.

The perforated liner portion 103 may include a single perforated liner segment, or, as illustrated, the perforated liner portion may include multiple perforated liner segments 105 coupled together. The one or more perforated liner segments 105 may be coupled together in a variety of ways. For instance, the one or more perforated liner segments 105 may be coupled together by way of threaded interfaces, mating interfaces, welding, or any other suitable mechanism. In some embodiments, the one or more perforated liner segments 105 may be coupled together by one or more intermediate coupling components. As illustrated in FIG. 1, for example, the one or more perforated liner segments 105 may be coupled together by way of casing couplings 106. Similar to the other connections described herein, the connections between the one or more perforated liner segments 105 and the casing couplings 106 may take any suitable form (e.g., threaded interfaces, mating interfaces, welding).

In some embodiments, the casing couplings 106 may act as, or be replaced by, one or more stabilizer or centralizer components. The one or more stabilizer/centralizer components may have an outer diameter that is larger than an outer diameter of the perforated liner portion 103. Optionally, such components may engage the interior wall of the wellbore or a casing within a wellbore to stabilize and center the liner assembly 100 within the wellbore.




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stats Patent Info
Application #
US 20140238748 A1
Publish Date
08/28/2014
Document #
File Date
12/31/1969
USPTO Class
Other USPTO Classes
International Class
/
Drawings
0


Elective Drilling System

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Boring Or Penetrating The Earth   Processes  

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20140828|20140238748|slotted liner drilling|Drilling assemblies, systems and methods enable a wellbore to be drilled and lined with a slotted liner. A drilling system includes a liner assembly with a drill string in a bore thereof. The drill string and the liner assembly can be selectively coupled together to restrict relative motion between the |Smith-International-Inc