Wells – Processes – With indicating – testing – measuring or locating
Reexamination Certificate
2000-03-27
2001-06-05
Bagnell, David (Department: 3672)
Wells
Processes
With indicating, testing, measuring or locating
C166S053000, C166S066000
Reexamination Certificate
active
06241020
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The subject invention generally pertains to equipment used for repairing wells that have already been drilled, and more specifically pertains to mobile repair units that frequently travel from one site to another.
2. Description of Related Art
After an oil rig drills a well and installs the well casing, the rig is dismantled and removed from the site. From that point on, a mobile repair unit is typically used to service the well. Servicing includes installing and removing inner tubing strings, sucker rods, and pumps. The variety of work requires a myriad of tools. When the tooling is not closely associated with the mobile repair unit, the right equipment may not be available when needed.
Moreover, the work is carried out by a company that typically owns and operates several mobile repair units. The units are often operating at the same time at various remote sites. Some sites may be separated by hundreds of miles. This makes it difficult to stay abreast of the status at each of the sites.
Typically, a supervisor will travel from site to site. However, this is inefficient and often critical steps of an operation get carried out unsupervised. At times, accidents occur in the absence of an unbiased witness.
SUMMARY OF THE INVENTION
To avoid the problems of today's mobile repair units, a first object of the invention is to closely associate hydraulic and pneumatic systems with a mobile repair unit by having them share a common power supply and monitoring system.
A second object of the invention is to provide a remotely accessible mobile repair unit with the necessary equipment to make it universally adaptable to do a variety of work such as removing and installing an inner tubing string, sucker rods, and pumps.
A third object is to provide a mobile repair unit that senses and transmits, to a remote home base, data that identifies the extent to which an inner tubing string was stretched prior to flooding the well bore with fluid.
A fourth object is to identify from a remote location key events, such as the time of transition of installing steel sucker rods to installing fiberglass ones.
A fifth object is to restrict local operator access to a system that monitors the operation of a mobile repair unit so an unbiased and unaltered record can be recorded and maintained of the complete system and activity of the mobile repair unit.
A sixth object is to convey to a remote location a record that helps explain events that led to an accident at the work site. When the information is conveyed to a remote site, it is not likely to be destroyed by the accident itself, such as a fire.
A seventh object is to remotely identify an imbalance of a mobile repair unit caused by wind or leaning inner tubing segments against its derrick.
An eighth object is to remotely distinguish between the raising and lowering of an inner tubing string to help establish the cause of an accident. An added benefit is to be able to place the proper predetermined tension on a packer or tubing anchor being set.
A ninth object is to enable one to remotely identify when a mobile repair unit is operating for the purpose of determining the amounts to be invoiced for the work performed.
A tenth object is to provide a method of alerting a home base of a hazardous level of hydrogen sulfide gas present at a remote work site.
These and other objects of the invention are provided by a self-contained mobile repair unit having a universal set of hydraulic and pneumatic tooling for servicing well equipment such as an inner pipe string, a sucker rod and a pump. The repair unit and tooling share a common engine. An extendible derrick supporting a hoist is pivotally coupled to the frame of the repair unit. A monitor senses the load on the derrick and conveys that information to a remote home base where the time of critical events is identified.
REFERENCES:
patent: 4222491 (1980-09-01), Geppert
patent: 4511974 (1985-04-01), Nakane et al.
Bagnell David
Harter Robert J.
Walker Zakiya
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