Unlock instant, AI-driven research and patent intelligence for your innovation.

Rig assist compensation system

a compensation system and rig technology, applied in the direction of sealing/packing, drilling pipes, borehole/well accessories, etc., can solve the problems of hazard to equipment and personnel, near elimination of the possibility of drilling structure, and higher time-consuming

Inactive Publication Date: 2007-04-19
HYDRAULIC WELL CONTROL
View PDF15 Cites 41 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides an improved rig assist compensation system that is integrated into an improved HWO jack system with a motion compensation unit. This system can be used in conjunction with existing cable-type heave compensators and can operate in conjunction with the stroke of the improved HWO jack system. The motion compensator unit includes a base frame and an upper frame that are movable from an extended position to a retracted position and can compensate for any movement or motion during the use of the rig assist compensation system. This improves the stability and efficiency of the rig assist compensation system."

Problems solved by technology

It will be realized that with high well pressures, the lifting force exerted on the pipe may become tremendous and if not kept under control could easily result in damage causing great delays and even result in disaster.
The main problem with conventional well intervention compensators are that use of frames and cables nearly eliminates the possibility of using the drilling structure for anything other than a support structure for the conventional HWO unit, coil tubing, wireline, slick line, and electric line applications.
Another problem with conventional well intervention compensators are that the handling of a large compensator frame must be done in a highly controlled fashion, with numerous points of hazard to equipment and personnel on the offshore structure.
Working with the cable systems creates a higher level of time for rigging up, while using unaccustomed methods to achieve the rig-up.
Both of these processes create a working environment that is relative less safe.
Another problem is that the compensator lift frame is a large and bulky system.
Due to its large size, transporting on-shore often requires a permit load, and typically requires larger transporting equipment when dispatched offshore.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Rig assist compensation system
  • Rig assist compensation system
  • Rig assist compensation system

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0038] In contrast to the prior art of FIG. 1, FIG. 2 is an elevation view of the present invention depicting an improved HWO jack 20 having a motion compensation unit 21, and working in conjunction with an existing cable-type rig compensation system 22 at zero heave. A semi-submersible rig platform 23 is shown having a deck 24, to which the HWO jack (or “snubbing jack”) 20 is rotatably affixed for operation on top of the BOP stack 4. The water line 25 resides below the “moon pool” area 26 of the rig 23. The cable compensation system 22 is connected to the riser 5, passing through pulleys 27 and terminating at the rig deck 24. The HWO jack 20 includes a through-rotary portion 28, i.e. drilling platform rotary table, shown in more detail in FIG. 14, and a stationary portion 29, shown in more detail in FIG. 15. Below the stationary portion 29 of the HWO jack 20 is a hydraulic motion compensator unit 30, shown in more detail in FIG. 16.

[0039] With specific reference to FIGS. 14 and 15,...

second embodiment

[0043]FIG. 5 is an elevation view of the present invention depicting an improved HWO jack having a motion compensation unit, and working in conjunction with an existing cable-type rig compensation system at zero heave, wherein additional compensation is provided by the through-rotary elements of the HWO jack. In this embodiment, the through-rotary portion 28 of the HWO jack 20 includes its own hydraulic power and control components, and further serves as a compensation system. However, the through-rotary portion 28 compensation is independently controlled from both the motion compensator unit 30 and the rig compensator 22, although all such systems work cooperatively to reduce the effects of heave. When the invention is operated in this manner, the through-rotary portion 28 is also designed and controlled to maintain the depth or “weight on bit” of the work string below.

[0044]FIG. 6 is an elevation view of the embodiment of FIG. 5 at minus heave. Note that as a result, the stroke of...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An improved rig assist compensation system is provided, comprising a motion compensation unit operatively connected to a semi-submersible rig platform having a blow-out prevention (BOP) stack; a hydraulic workover (HWO) jack rotatably affixed above the BOP stack, wherein the HWO hack includes a through-rotary portion, and a stationary portion; and a hydraulic motion compensator unit, positioned between the HWO jack and the BOP stack. The motion compensator unit comprises a base frame having a plurality of base cylinders; an upper frame having a plurality of mating upper cylinders to engage the base cylinders in telescoping fashion, wherein the base frame and the upper frame are slidably connected, and are movable from an extended position and a retracted position.

Description

BACKGROUND OF THE INVENTION [0001] I. Field of the Invention [0002] The present invention relates generally to well intervention compensators, and more particularly to deep water rig assist compensation systems. It has particular application to lowering and lifting apparatuses that operate pipe and other tubular elements into and out of a well. [0003] II. Background and Prior Art [0004] A. Hydraulic Workover and Snubbing Background [0005] It is not uncommon in certain fields to drill through formations wherein effective well pressure conditions in excess of 3000 pounds per square inch are encountered, or to repair wells with pressure on the surface control equipment. In order to operate tubular goods within a well in the presence of high formation pressure, it has become the practice to pack off, near the surface, the annular space between the casing and the drill pipe or other tubular goods operating within the casing and to install a check valve on the end or inside the drill pipe...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): E21B29/12
CPCE21B19/006E21B19/09
Inventor PONVILLE, MICHAEL
Owner HYDRAULIC WELL CONTROL