Combined nitrogen generation system and well servicing fluid system in one power unit apparatus
A combined system for treating an oil and/or gas well, comprising: a single transportation means having mounted thereon: a single prime mover for providing prime power for the operation of pumps and motors mounted on said transportation means; a nitrogen generator that can gather gaseous nitrogen from the earth's atmosphere; and a fluid pumping system for pumping fluids into a wellbore, said nitrogen generator and said fluid pumping system being interconnectable by plumbing and including a power transmission means responsive to the operation of said engine.
This invention relates, generally, to the treatment of oil and gas wells using nitrogen from the atmosphere to increase the production capability of the wells, and specifically, to providing in a single unit, all of the equipment and accessories to pump high pressure nitrogen and chemicals into the wells being treated.
BACKGROUNDIt is known in the art to provide work over operations using gaseous nitrogen to remove sand and/or water or other impediments to production. The prior art has not recognized that a single, relatively small unit can be provided with all of the equipment and accessories for running a nitrogen generation service and pressure pumping chemicals to treat such wells.
U.S. Pat. No. 6,230,805 teaches a method of hydraulic fracturing in which at least two separate fracturing fluid components are pumped downhole, one of said components being pumped downhole within coiled tubing, but does not teach how to accomplish this with a single compact unit in which all equipment is powered by a common engine.
The prior art on land typically brings two or even three tractor-trailers to the well to be treated, one having either a liquid nitrogen tank or a large footprint nitrogen generation unit, and one having the nitrogen pumping unit, and one high pressure pumping unit for acids and other chemicals. The requirement for multiple tractor-trailers increases the transportation costs and personnel required to bring the units to the well and run this service.
U.S. Pat. No. 6,273,188 teaches a trailer mounted coiled tubing rig.
U.S. Pat. No. 6,702,011, also by the present inventors, teaches a combined nitrogen treatment system and coiled tubing system in one tractor/trailer apparatus.
Like the present invention, a single tractor trailer unit is provided, in which the tractor itself drives a plurality of hydraulic motors that control the pumps and motors associated with a nitrogen system that is used for injecting nitrogen into a well, but unlike the present invention, no disclosure is made for the provision of well servicing fluid tanks, mixers, and pumps. Instead a crane unit and a coiled tubing injection unit are provided. Unlike the present invention, the preferred type of nitrogen system is tanks of liquid nitrogen, although an alternative mode is disclosed in which the liquid nitrogen system is replaced with one or more nitrogen generators that gather nitrogen from earth's atmosphere. However, it was not disclosed, as in the present invention, that the nitrogen could be mixed with well servicing fluids provided by the same tractor-trailer unit, but rather the nitrogen was pumped through the coiled tubing unit into the well being treated; or directly into the wellhead.
PCT Application US2004/034521, also by the present inventors, teaches a three-in-one nitrogen treatment system, fluid system, and coiled tubing system in one unit. Like the present invention, a single tractor-trailer or marine unit is provided, in which a single engine drives a plurality of hydraulic motors that control the pumps and motors associated with a nitrogen system and a fluid system that is used for injecting nitrogen and fluid into a well, but unlike the present invention, a coil tubing system is also provided, which increases power requirements above those of the present invention. The only means disclosed for pumping fluid to the well is through the coil tubing system and no disclosure is made for the injection of well servicing fluids directly into the well. Also, no fluid blending tank is disclosed (a chemical tank, which is a tank inside a tank—double walled).
The off shore prior art that has the same functionality as the present invention, other than prior art from the present inventor, is large and expensive and requires either multiple trucks tractors and trailers, multiple barges or ships or a larger, more expensive barge or ship that has a deeper draft and can therefore depart from and reach fewer locations.
Prior art units have components that are permanently attached to a transportation unit. This is a problem if there is a need to replace or upgrade any component. Because of improvements in nitrogen generation technology, the ability to upgrade this component is especially desirable, yet is not available in the prior art.
The primary object of the present invention is to provide a small unit that can be placed on a single tractor-trailer or a small barge or ship to provide a nitrogen generation system and pump a combination of high pressure nitrogen and acids or other chemicals into wells.
SUMMARYA combined system for treating an oil and/or gas well, comprising: a single transportation means having mounted thereon: a single prime mover for providing prime power for the operation of pumps and motors mounted on said transportation means; a nitrogen generator that can gather gaseous nitrogen from the earth's atmosphere; and a fluid pumping system for pumping fluids into a wellbore, said nitrogen generator and said fluid pumping system being interconnectable by plumbing and including a power transmission means responsive to the operation of said engine.
Trailer bed 30 is connected to the tractor bed 21 by way of the mechanism 22. Mounted on the trailer bed 30, is a feed air system 32 that is connected to nitrogen membranes 33. Together, the feed air system 32 and nitrogen membrane 33 function as a nitrogen generator 31 (also shown in
Referring now to
Referring now to
Another hydraulic pump 96 drives a motor 98 to drive the crane 46 that is illustrated in
Another hydraulic pump 100 drives a motor 102 to power the blending tanks that are illustrated in
It should be appreciated that the prime mover 70 drives each of the hydraulic pumps 64, 90, 96 and 100 as shown by the line 106. Coming off of the prime mover 70, the hydraulic pump 64, 90, 96 and 100 are preferably driven by one or more belts that can be used with clutch pulleys as desired. A compressor unit 108 that is also driven by the prime mover 70 is run off of the drive line 106 to assist in keeping the liquid nitrogen down to its desired temperature.
It should be appreciated that while the prime mover 70 is obviously and desirably located on the tractor, and the nitrogen generation system and well servicing fluid system are preferably located on the trailer, most of the other items identified in FIG. 3 can be found on either the tractor and/or the trailer as desired. The important feature of this invention is to recognize that all of the items shown in
Nitrogen generators, shown in
Referring now to
The nitrogen generator 31 as a stand alone unit is available commercially. Combination of a nitrogen generator with fluid pumping and mixing on a single tractor-trailer and all powered by a single prime mover is not known in the prior art to the best of the inventor's knowledge, and as far the inventor knows, the preferred embodiment of the invention has a smaller footprint than any functional equivalent.
The preferred embodiment of the present invention can be used for any application that requires pressure pumping various chemicals, including but not limited to:
-
- completions
- workovers
- underbalanced drilling
- well servicing
- enhanced oil recovery
- industrial plant degassing and purging
- mining
- purging pipelines with nitrogen
- deepwater marine applications
- LNG & LPG tanks and facilities
- nitrogen lifting, the lifting of fluids from wells when the well does not have sufficient pressure (insufficient bottom hole pressure for production).
The preferred embodiment can operate as a stand-alone unit or operate with a separate coil tubing unit and is also compatible with any coil tubing unit. When working with a separate coil tubing unit, connecting discharge line 40 of the preferred embodiment to the coil tubing unit allows the coil tubing unit to pump nitrogen and chemical mixtures into the well.
As a stand alone unit, without a coil tubing unit, the preferred embodiment can do well servicing:
-
- nitrified acid
- nitrogen displacement
- pipeline testing
- tubing testing
- acidizing
- cleanouts
- fix sanding up
- parafins
Connected to a separate coil tubing unit the preferred embodiment can:
-
- foam wash
- jet with nitrogen
- nitrify acid
- nitrogen inhibitor
One advantage of the preferred embodiment is that it makes it possible to do with one tractor-trailer what previously required three tractor-trailers: a liquid nitrogen tank transport truck, a second tractor trailer with a high pressure pumping system for other chemicals and acids, and a third tractor trailer with a nitrogen pumping unit. Because this embodiment allows one tractor-trailer to do what once require several connected together with the requisite hoses and plumbing, the time and expense of plumbing the separate units together is avoided. Plumbing all three systems together before rigging up to the well is avoided. Disconnecting and stowing all of the plumbing after completion is also avoided, saving additional time and labor. Where the prior art took three tractor-trailers and three days (one day each for set-up, well treatment, and disassembly), the preferred embodiment can do the same job with one tractor-trailer in one day. The danger of transporting liquid, which is an explosion hazard, is also avoided. Tripping hazards associated with the plumbing and hoses are also avoided.
The preferred embodiment is even more advantageous in remote locations where liquid nitrogen is rare and expensive, or extremely difficult to transport to the well head.
It should be noted that while the embodiment described so far is mounted on and uses the engine of a tractor-trailer, the invention can also be mounted on skids and powered by a prime mover such as a marine engine and is equally suited for off shore use. Because of its small footprint, this invention allows replacement of large, expensive barges or ships with much smaller and cheaper barges or ships that have shallower drafts.
Although the present invention has been described by reference to its preferred embodiment as is disclosed in the specification and drawings above, many more embodiments of the present invention are possible without departing from the invention. Thus, the scope of the invention should be limited only by the appended claims.
Claims
1. A combined system for treating an oil and/or gas well, comprising:
- a. a transportation means having mounted thereon: i. a single prime mover for providing prime power for the operation of pumps and motors mounted on said transportation means; ii. a nitrogen generator that has a gaseous nitrogen gathering capability for gathering nitrogen from the earth's atmosphere; and iii. a fluid pumping system for pumping fluids into a wellbore,
- b. said nitrogen generator and said fluid pumping system each being interconnectable by plumbing and responsive to the operation of said prime mover.
2. The system according to claim 1 wherein said transportation means comprises a tractor-trailer.
3. The system according to claim 1 wherein said transportation means comprises a marine vessel.
4. The system according to claim 1 wherein said transportation means comprises a skid.
5. The system according to claim 1 further comprising attachments for connecting said fluid pumping system to a coil tubing unit.
6. The system according to claim 1 further comprising acid tanks and wherein said fluid pumping system comprises high pressure pumps.
7. The system according to claim 1 further comprising a fluid blending tank, said fluid blending tank, said nitrogen generator, and said fluid pumping system each being interconnectable by plumbing and responsive to the operation of said prime mover.
8. The system according to claim 1 wherein all components are controlled by a single control panel.
9. The system according to claim 1 wherein said components, including said nitrogen generator, are removably attached to said transportation means so that individual components may be replaced.
10. The system according to claim 1 wherein said nitrogen generator is no larger than a standard liquid nitrogen tank.
Type: Application
Filed: Jul 16, 2006
Publication Date: Jun 18, 2009
Inventor: James B. Crawford (Laffayette, LA)
Application Number: 11/988,905
International Classification: E21B 43/00 (20060101); E21B 41/00 (20060101);