Integral Self-Contained Drillstring Compensator
a self-contained, compensator technology, applied in special-purpose vessels, floating buildings, transportation and packaging, etc., can solve the problems of heaving, affecting the ability of operators to drill wells, and presenting similar problems, so as to achieve the effect of reducing the risk of blowout, reducing the safety of operators, and reducing the risk of heaving
Inactive Publication Date: 2016-10-06
INTEGRAL OILFIELD SOLUTIONS LLC
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Benefits of technology
The patent text describes a need for a back-up or secondary heave compensation system for floating drilling rigs that is compact and self-contained, and can act as a back-up to the primary heave compensation system in case of failure. This is important because drill ships or semi-submersible drilling rigs have limited space available on the derrick, and a large back-up system would affect the limited space on the rig in a lesser manner. The invention aims to address this need by providing a solution that is efficient and effective in protecting against the effects of heave and reducing the risk of blowouts due to potential fracturing or breaking of the production tubing string.
Problems solved by technology
The movement of drill ships or semi-submersible drilling rigs with the waves of the sea presents a unique problem in drilling with these types of rigs.
This fluctuation in the force applied on the drill bit severely hinders an operator's ability to drill the well bore.
Although heave presents a problem in drilling with these types of rigs, heave presents similar problems with other drilling activities, such as well completions, well testing, well interventions, well production, and other operations.
Perhaps more importantly, heave creates the potential for blowouts due to a potential fracturing or breaking of the production tubing during testing, workover, or completion operations.
Because the production tubing is held in place within the well bore, any rise of the floating drilling rig due to heave will increase the tension on the production tubing string and could cause the string to fracture or break.
A fracturing or breaking of the production tubing string would allow the oil or gas within the tubing to leak, creating the potential for a blowout.
However, many prior art floating drilling rigs are generally not equipped with a back-up, or secondary, heave compensation system that operates in the event the primary heave compensation system is not functioning properly or becomes inoperative.
In such a situation, the floating drilling rig will have no way to compensate for heave.
Some prior art floating drilling rigs are equipped with a back-up, or secondary, heave compensation system that operates in the event the primary heave compensation system fails, but these systems are very large and require much floor space on the rigs for air compression systems and hoses extending from the air compression systems to the secondary heave compensation system.
Since drill ships or semi-submersible drilling rigs have limited space available on the derrick, what is needed is a heave compensation system that acts as a back-up system to the primary heave compensation system and that is compact and self-contained such that the limited space available on a floating drilling rig is affected in a lesser manner.
Method used
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[0018]The exemplary embodiments disclosed herein are directed to systems, methods, and devices for providing an integral self-contained drillstring compensator that includes a cylinder assembly, an accumulator, and at least one air pressure cylinder and will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. The invention is better understood by reading the following description of non-limiting, exemplary embodiments with reference to the attached drawings, wherein like parts of each of the figures are identified by like reference characters, and which are briefly described as follows.
[0019]FIG. 1 is a pa...
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An integral self-contained drillstring compensator includes at least one high pressure air cylinder, an accumulator, and a compensating cylinder, which are fluidly coupled to one another. The high pressure air cylinders include a compressible gas that is communicable to the accumulator, which has fluid included therein. The compressible gas provides a pressure on the fluid, thereby allowing the fluid to communicable between the accumulator and the compensating cylinder. The fluid causes a cylinder rod within the compensating cylinder to extend and retract from the compensating cylinder, thereby providing compensation during heaves. The drillstring compensator optionally includes a low pressure air cylinder to store a low pressure compressible fluid that communicates with the compensating cylinder.
Description
CROSS REFERENCE TO RELATED APPLICATIONS[0001]This patent application claims priority under 35 U.S.C. §119(e) to U.S. Provisional Patent Application No. 62 / 141,067 titled “Integral Self-Contained Drillstring Compensator” filed on Mar. 31, 2015, the entire content of which is hereby incorporated by reference herein.TECHNICAL FIELD[0002]The present disclosure relates to an inline self-contained compensator apparatus and method for use and installation on floating drilling rigs and workover or production vessels. In particular, the present disclosure relates to an inline self-contained compensator apparatus that functions as a back-up system for the primary or main heave compensation system of a floating drilling rig or vessel in the event the primary heave compensation system becomes disabled or inoperative.BACKGROUND OF THE INVENTION[0003]Drilling for oil and gas off-shore is completed from one of two types of drilling rigs: rigs that are supported by the sea floor (such as fixed dril...
Claims
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IPC IPC(8): E21B19/00B63B35/44B63B39/00E21B19/09E21B15/02
CPCE21B19/006E21B19/09E21B15/02B63B39/005B63B35/4413B63B39/03
Inventor HOLMAN, FREDERICK GEORGEHANCOCK, RICHARD
Owner INTEGRAL OILFIELD SOLUTIONS LLC