Reduced differential sticking drilling collar
a technology of differential sticking and drilling collar, which is applied in the field of subterranean well development, can solve the problems of differential pressure pipe sticking, pipe sticking, and drill string becoming stuck in the wellbore, and achieve the effect of prolonging the tim
Pending Publication Date: 2022-02-17
SAUDI ARABIAN OIL CO
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Benefits of technology
The patent describes a new drilling collar design that reduces the risk of the drill string becoming stuck in the wellbore due to differential pressure, while also balancing and distributing the pressure more evenly along the tool. The design includes a spiraled collar that maximizes bending stiffness and provides sufficient bypass area for the evacuation of cuttings from the wellbore. Additionally, the external profile of the collar agitates cuttings and prevents a cuttings equilibrium layer from forming around the collar. These technical effects improve the performance and safety of drilling operations.
Problems solved by technology
During drilling operations there is a risk of the drill string becoming stuck in the wellbore.
As an example, mechanical interference or differential pressures can cause a stuck pipe.
Differential pressure pipe sticking can occur when there is an overbalance of pressure in the hole compared to the formation and the pipe becomes embedded in a mudcake along a wall of the wellbore.
The risk of a pipe getting stuck increases with the larger the overbalance of pressure, the more surface area of the pipe that is in contact with the wall of the wellbore, the vector sum of combined forces, and the longer the time that the pipe spends stationary.
Drilling long horizontal well sections can be especially problematic.
Method used
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[0034]The disclosure refers to particular features, including process or method steps. Those of skill in the art understand that the disclosure is not limited to or by the description of embodiments given in the specification. The subject matter of this disclosure is not restricted except only in the spirit of the specification and appended Claims.
[0035]Those of skill in the art also understand that the terminology used for describing particular embodiments does not limit the scope or breadth of the embodiments of the disclosure. In interpreting the specification and appended Claims, all terms should be interpreted in the broadest possible manner consistent with the context of each term. All technical and scientific terms used in the specification and appended Claims have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless defined otherwise.
[0036]As used in the Specification and appended Claims, the singular forms “a”, ...
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Systems and methods for drilling a subterranean well include a reduced differential sticking drilling collar. The reduced differential sticking drilling collar is an elongated tubular member having a minimum outer diameter at an uphole end and at a downhole end. A collar body is located between the uphole end and the downhole end. The collar body has a cross section of alternating lobes and troughs. The collar body has a maximum outer diameter that is larger than the minimum outer diameter. A taper section extends from the minimum outer diameter to the maximum outer diameter. The lobes of the collar body wind along an entire axial length of the collar body in a spiral pattern.
Description
CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims priority to and the benefit of co-pending U.S. Provisional Application Ser. No. 63 / 066,791, filed Aug. 17, 2020, titled “Low Contact Area Drilling Collar,” the full disclosure of which is hereby incorporated herein by reference in its entirety for all purposes.BACKGROUND OF THE DISCLOSURE1. Field of the Disclosure[0002]The present disclosure relates to subterranean well development, and more specifically, the disclosure relates to collars that are used in drill strings during the drilling of the subterranean well.2. Description of the Related Art[0003]During the drilling of a wellbore of a subterranean well, a drilling collar can be added to the drill string to add additional weight to the drilling bit. A drilling collar is large diameter, heavy walled drill pipe. In general the more weight that can be applied, the faster the rate of penetration (ROP), unless other drilling dysfunctions prevent a faster ROP, such as...
Claims
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IPC IPC(8): E21B17/16E21B17/10E21B10/32
CPCE21B17/16E21B10/32E21B17/10E21B31/035E21B17/1078
InventorPYE, RICHARD MARKYOUNGER, RAE ANDREW
OwnerSAUDI ARABIAN OIL CO