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Publication numberUS3765483 A
Publication typeGrant
Publication dateOct 16, 1973
Filing dateAug 9, 1971
Priority dateAug 9, 1971
Publication numberUS 3765483 A, US 3765483A, US-A-3765483, US3765483 A, US3765483A
InventorsVencil N
Original AssigneeDresser Ind
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method and apparatus for producing dual zone oil and gas wells
US 3765483 A
Abstract
Two oil and gas zones are produced by allowing production from each zone to drain to separate chambers where production from each zone is pumped by a separate pump; the outputs from the separate pumps are commingled and conducted to the earth's surface. A separate gas vent is provided for each zone to the earth's surface.
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United States Patent 1191 Vencil METHOD AND APPARATUS FOR PRODUCING DUAL ZONE OIL AND GAS WELLS [75] Inventor: Naylan N. Vencil, Odessa, Tex.

[73] Assignee: Dresser Industries Inc., Dallas, Tex.

[22] Filed: Aug. 9, 1971 21 Appl. No.2 170,166

[52] US. Cl. 166/265, 166/54.l, 166/313 [51] Int. Cl. E2lb 43/00 [58] Field of Search 166/54.l, 265, 313

[56] References Cited UNITED STATES PATENTS 2,910,002 10/1959 Morgan ..166/54.1

29: p GAS LG MMETER Hodges 166/313 X Morris et al. 166/313 UX Primary ExaminerMarvin A. Champion Assistant Examiner-Jack E. Ebel Attorney-Robert W. Mayer et a1.

[57] ABSTRACT Two oil and gas zones are produced by allowing production from each zone to drain to separate chambers where production from each zone is pumped by a separate pump; the outputs from the separate pumps are commingled and conducted to the earths surface. A separate gas vent is provided for each zone to the earths surface.

3 Claims, 1 Drawing Figure PATENTEU OCT 1 5 I973 INVENTQRI NAYLAN N. VENCI L AGENT METHOD AND APPARATUS FOR PRODUCING DUAL ZONE OIL AND GAS WELLS CROSS REFERENCES TO RELATED APPLICATIONS This application is related to my copending application Method and Apparatus for Producing Multiple Zone Oil and Gas Wells," Ser. No. 163,795 filed July 19, 1972, and copending application Method and Apparatus for Producing Multiple Zone Oil and Gas Wells, Ser. No. 163,855, filed July 19, 1972 by Nijah Frank Myers.

BACKGROUND OF THE INVENTION The field of the invention relates to dual zone wells which require both of the zones to be artificially lifted. This method and apparatus is suitable for wells producing oil, saltwater, fresh water or other liquid with or without natural gas in one or more of the zones.

A prior art device is shown in U.S. Pat. No. 2,618,339. This prior art device discloses apparatus for commingling multiple zone well production, the apparatus being arranged in the well so that the upper zone production travels down the casing and allows gas entrained in the liquid to break out and pass to the surface. No provision is made, however, for separate handling of the lower zone gas. The device does not provide a check valve to prevent high pressure in the lower zone from passing through the tool and into the upper zone where such liquid may not be recoverable. Also, the pump intake is positioned above the packer which is not necessarily a desirable position in the case of a low pressure, low production, lower zone. A further prior art device, shown in U.S. Pat. No. Re 26,319, discloses a flow control device for producing multiple zone wells which have sufficient drive in the producing zones to cause the fluid to flow into the well bore where it is metered through predetermined orifices and commingled at a point whereby gas from a higher pressure zone can assist in lifting production from a lower pressure zone. An additional prior art device, shown in U.S. Pat. No. 3,509,941, discloses a confluent producton apparatus wherein one zone or the other or both zones can be produced. Check valves are provided in the passages from each zone so that flow is prevented between the zones but no provision is made for separate handling of gas from the lower zone nor is the position of the pump intake desirable because the pump intake is above the packer between zones and is, therefore, above the lower zone. An additional prior art device, shown in U.S. Pat. No. 3,559,740, discloses method and apparatus for use with hydraulic pump and multiple completion well bores. This patent discloses a separate vent for the lower zone gas. It also discloses various selector heads which provide production from either one or both of the zones and provides for chokes to meter production from the zones. However, none of the prior art devices show or disclose apparatus which adequately drains production from zones in a multiple zone well, wherein one or more zones have such low pressure that production is reduced in total or in part by reason of hydrostatic pressure from another zone, or in a column of the liquid in the well bore being lifted from the zone to a pump intake.

It is a primary object of this invention to provide a dual zone producing arrangement which provides for individual pumping of a high pressure and a low pressure zone, and then for the commingling of the pumped liquids.

It is a further object of this invention to provide a dual zone producing arrangement which provides for individual lifting of each zone.

It is a further object of this invention to provide a dual zone production apparatus which provides separate venting of the gas from each zone.

It is a further object of this invention to provide a dual zone production apparatus which provides for separate measurement of the gas from each zone.

It is a further object of this invention to provide a multiple zone production apparatus which conserves hydrocarbons and prevents loss of fluid or gas from a high pressure zone into a lower pressure zone in the same well bore.

SUMMARY OF THE INVENTION These and other objects of this invention are fulfilled, broadly, with a dual zone producing apparatus and method which provides a separate pump for each zone and which then provides for the commingling of the fluids from the production zones at the discharge of the pumps.

BRIEF DESCRIPTION OF THE DRAWING The sole FIGURE is a view partially in elevation and partially in section of a well bore with well casing and apparatus according to this invention which may be used to produce a dual zone well. A

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawing of the preferred embodiment, casing 10 is shown in a well bore through two producing horizons l2 and 14. Perforations 16 and 18 in the upper and lower producing zones, respectively, allow production from these zones to flow into the casing 10. A packet 20 is sealingly engaged with the casing 10 between the perforations l6 and 18 to isolate the producing zones from each other. Gas from the upper zone 12 flows into the casing 10 through perforation 16 and is designated UG. Gas may be dissolved and/or entrained in the upper zone liquid production designated U. Some of the upper zone gas UG can break out of the liquid U and flow upward through the casing 10 to be gathered from outlet 22 in the casing at the top of the well bore. The volume of UG gas passing through this outlet is measured with gas meter 23 and then used for gas lift purposes, sold into a pipeline, or used for other purposes. Production gas LG from lower zone 14 flowing into casing 10 through perforations 18 may flow upward into a seal nipple 24 sealingly engaged to packer 20 and tubing string 28 which extends to the top of the Well bore where it may be measured by gas meter 29 and disposed of in one of the ways mentioned for the UG gas. Liquid production U from the upper zone can gravitate or flow downward through annulus 30 to check valve 32 which is incorporated in the flow path for liquid U permitting flow into chamber 34 from the upper zone but preventing back flow from chamber 34 to annulus 30. Lower zone liquid production L flows into casing 10 through perforations l8 and flows through annulus 36 through intake port 42 into pump 38. Check valve 40 in pump 38 prevents back flow into liquid to lower zone 14.

Lower production L then flows into lower pump 38 which lifts lower production L and discharges the liquid through check valve 44 which acts as a discharge port from pump 38. Liquid L then flows up through the lower portion 46 of tubing string 48, and then through a side port 49 into a passageway 50 in body 52. Lower production L then continues upward and passes through port 54 into the upper portion of tubing string 48 through which it is conducted to the top of the well bore and is produced into a flow line connection 56. The upper zone pump 58 receives upper zone production through check valve 32 and chamber 34. The liquid then flows up into pump 58 where it is lifted and discharged through check valve 60. Upper zone production U flows upward and out discharge port 62 inside tubing string 48 where upper zone production U and lower zone production L are commingled and conducted to the surface to be carried away in flowline connection 56. The upper zone pump 58 and lower zone pump 38 are operated by a conventional sucker rod string 64 which is reciprocated by a pumping jack (not shown) or other apparatus well known to those of ordinary skill in the art.

Plunger pumps may be of the traveling plunger variety with a stationary barrel or may be of a traveling barrel variety with a stationary plunger according to the needs of a particular installation. In the instant invention, the sole FIGURE illustrates the upper pump of the stationary barrel and traveling plunger variety. Upper pump 58 has a stationary barrel 66 which is anchored to a conventional seating nipple 68 which is well known to those of ordinary skill in the art. The seating nipple 68 anchors the stationary portion of the upper pump and forms a seal with body 52 in the main passageway 70, a portion of which forms chamber 34. A polish rod 72 connects the movable portions of the upper and lower pumps and provides for reciprocating the movable portion of lower pump 38 along with the reciprocation of the movable portion of upper pump 58. A lower seal means 74 is provided in the passage 70 in body 52. The seal means 74 sealingly engages the lower portion of passage 70 below the side port 76 which connects check valve 32 to chamber 34 and provides a moving seal with polish rod 72 to isolate passage 70 between side port 76 and lower port 49. Upper seating nipple 68 seals side port 76 from upper port 54 to provide a seal between intake side of the upper pump 58 from the discharge port 62 of the upper pump 58. collet 78 is connected to lower seal means 74 and mechanically engages shoulder 80 to provide a mechanical lock to hold lower seal means 74 in position while polish rod 72 reciprocates therein. A tubular release mechanism 82 is attached to lower end of polish rod 72 to collapse collet 78 to a diameter smaller than the diameter of shoulder 80 when the dual zone pump assembly is lifted by sucker rod string 64 for withdrawal from the tubing string, providing for complete recovery of the dual zone pump assembly for service simply by withdrawing the assembly on the sucker rods when service is required. A lower landing nipple is provided in the tubular string 46 below the body 52 to seal the stationary portion of the lower pump 38 to the tubular string 46.

A dual zone producing apparatus according to this invention which provides a dual zone pump with separate pump elements for each zone is adaptable for a well which has differing producing zone pressures. Re ferring to my copending application, Ser. No. l63,795, filed July 19, 1972, entitled Method and Apparatus for Producing Multiple Zone Oil and Gas Wells, a chamber is disclosed for receiving production which drains from the multiple zones. A single pump then lifts the fluid from this chamber in which production from the various zones is commingled. In a well apparatus such as this, if one zone has a significantly higher pressure than the other zone, it would be possible for the higher pressure zone to maintain such a large pressure in the chamber where the production is commingled such that the lower pressure zone would not have adequate pressure to cause flow into the common chamber thereby preventing or reducing production from the lower pressure zone. Apparatus according to the instant invention, however, provides for a separate pump for each zone so that zones of different pressures may be pumped, each zone with its own pump, providing commingling of the pumped fluids so that the higher pressure in one zone will not affect the drainage and production from the lower pressure zone.

Commingling the produced liquids provides a completion which can be installed at much lower cost than a completion which provides for separate production of each zone to the surface.

Some state regulatory authorities have previously required separate production and measuring of liquids from each zone before the liquids are mixed. Current testing methods which determine the production rate from the various zones are now being recognized and permitted by these regulatory authorities whereby commingled production from a well can be allocated to the various zones based on individual production testing from each zone.

Provision of the parallel tubing string 28 with the second passage through packer 20 is an optional feature which may be incorporated if there is sufficient gas produced from a lower zone to require a separate vent for the lower zone gas LG.

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. ln multiple zone well production and commingling apparatus comprising:

a well casing passing through upper and lower producing zones in a well bore, said casing having upper and lower openings through which production from said upper and lower zones can flow, respectively, into the well casing;

barrier means in said casing between said upper and lower openings, said barrier means having a longitudinal passage;

a tubular string having upper and lower sections, said tubular string extending from the top of the well bore to said barrier means and communicating with and secured to said longitudinal passage;

body means interposed between said upper and lower sections of said tubular string and located above said barrier means, said body means having a first longitudinal passageway and a side port extending from said first longitudinal passageway to the exterior of said body, said body means further having a second longitudinal passageway, said second longitudinal passageway having an upper port communicating with the upper section of said tubular string, said second passageway having a lower port communicating with the lower section of said tubular string which communicates with said second longitudinal passage and said lower zone;

an upper plunger pump in said tubular string and having a movable portion and a stationary portion;

a lower plunger pump located in said tubular string below said upper pump and having a movable portion and a stationary portion;

upper seal means for sealing the stationary portion of said upper plunger pump to said body between said side port and said upper port;

a polish rod connecting the movable portion of said upper pump to the movable portion of said lower lower seal means for sealing said polish rod to the lower end of said first longitudinal passageway between said side port and said lower port; and

lower landing nipple means in said tubular string located below said body for sealing the stationary portion of said lower pump to said tubular string.

2. Apparatus according to claim 1 further comprisa second passage in said barrier means; and

a second tubular string communicating with said second passage in said barrier means and extending to the top of the well bore for conducting gas from the lower zone to the top of the well bore.

3. In dual zone pumping and commingling apparatus adapted to be operated in a tubular string having upper and lower sections located in a well bore having casing passing through two producing zones and having a packer in the casing between the producing zones, the packer being connected to the tubular string, the improvement comprising:

a body having at least two longitudinal passages, said first passage aligned and connected to said tubular string, said body interposed between said upper and lower sections of the tubular string intermediate the packer and the top of the well bore, said body having a side port connecting said first passage to the exterior of said body, said second longitudinal passage having an upper port communicating with said upper section of said tubing string, said second passage having a lower port communicating with the lower section of said tubular string and the zone beneath said packer;

a check valve controlling flow in said side port, allowing upper zone production to flow into said first passage and preventing reverse flow;

an upper plunger pump in said tubular string, having a stationary portion, a movable portion, an intake port and a discharge port;

a lower plunger pump in said tubular string, having a stationary portion, a movable portion, an intake port and a discharge port;

a polish rod connecting the movable portion of said upper plunger pump to the movable portion of said lower plunger pump;

upper seating nipple means sealing and connecting the stationary portion of said upper plunger pump to said body between said side port and said upper port;

said upper plunger pump having said intake port communicating with said first passage above said upper seating nipple means and having said discharge port communicating with the tubular string above said upper seating nipple means;

seal means for sealing said polish rod to the lower rod of said first longitudinal passage between said side port and said upper port;

lower seating nipple means sealing and connecting the stationary portion of said lower plunger pump to the tubular string; and

said lower plunger pump having said intake port communicating with the tubular string below said lower seating nipple means, and having said discharge port communicating with the tubular string above said lower seating nipple means and below said body.

5 UNLTED ST QTES PATENT OFFICE CER'IKFECATE G1? CORRECTION Pa 3.765. 18? 'Dafied o ctoher 16 107i Inventor(s) Naylan N. Vencil It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

In claim 3 atcolumn 6, line 26, delete "rod" at its econd, occurrence, and insert therfore end Signed and sealed this 9th day of Abril l97)4..

(SEAL) Attestz.

EDWARD I-I.F-LETCI-IER,JR. c. MARSHALL mum Attesting Officer Commissionerof Patents

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2642803 *Apr 27, 1950Jun 23, 1953Standard Oil Dev CoDual production zone pump
US2910002 *Dec 31, 1956Oct 27, 1959Phillips Petroleum CoTwo zone pumping
US3283570 *Jun 26, 1963Nov 8, 1966Sun Oil CoProduction measurement in multiple completion wells
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4258787 *Jul 11, 1979Mar 31, 1981Baker International CorporationSubterranean well injection apparatus
US4593760 *Jan 4, 1984Jun 10, 1986The Upjohn CompanyRemoval of volatile contaminants from the vadose zone of contaminated ground
US4660639 *Feb 6, 1986Apr 28, 1987The Upjohn CompanyRemoval of volatile contaminants from the vadose zone of contaminated ground
US4974674 *Mar 21, 1989Dec 4, 1990Westinghouse Electric Corp.Extraction system with a pump having an elastic rebound inner tube
US5106232 *Aug 10, 1990Apr 21, 1992Roy F. Weston, Inc.Method of in situ decontamination
US5160217 *Apr 19, 1991Nov 3, 1992Roy F. Weston, Inc.Method of in situ decontamination
US5238066 *Mar 24, 1992Aug 24, 1993Exxon Production Research CompanyMethod and apparatus for improved recovery of oil and bitumen using dual completion cyclic steam stimulation
US5360067 *May 17, 1993Nov 1, 1994Meo Iii DominicVapor-extraction system for removing hydrocarbons from soil
US5505258 *Oct 20, 1994Apr 9, 1996Muth Pump LlcParallel tubing system for pumping well fluids
US5554290 *Apr 11, 1995Sep 10, 1996Geraghty & Miller, Inc.Insitu anaerobic reactive zone for insitu metals precipitation and to achieve microbial de-nitrification
US5575589 *Apr 11, 1995Nov 19, 1996Geraghty & Miller, Inc.Apparatus and method for removing volatile contaminants from phreatic water
US5588490 *May 31, 1995Dec 31, 1996Geraghty & Miller, Inc.Method and system to achieve two dimensional air sparging
US5657821 *Jul 31, 1995Aug 19, 1997Elf Aquitaine ProductionFacility for an oil well
US5664911 *Jul 23, 1996Sep 9, 1997Iit Research InstituteMethod and apparatus for in situ decontamination of a site contaminated with a volatile material
US5707221 *Jun 5, 1995Jan 13, 1998Institit Francais Du PetroleMethod of plural zone pumping utilizing controlled individual pump inlet in each zone
US5765639 *Jul 29, 1996Jun 16, 1998Muth Pump LlcTubing pump system for pumping well fluids
US5934372 *Jul 24, 1997Aug 10, 1999Muth Pump LlcPump system and method for pumping well fluids
US6007274 *May 19, 1997Dec 28, 1999Arcadis Geraghty & MillerIn-well air stripping, oxidation, and adsorption
US6102623 *May 18, 1999Aug 15, 2000Arcadis Geraghty & Miller, Inc.In-well air stripping, oxidation, and adsorption
US6116816 *Aug 26, 1998Sep 12, 2000Arcadis Geraghty & Miller, Inc.In situ reactive gate for groundwater remediation
US6143177 *Sep 21, 1998Nov 7, 2000Arcadis Geraghty & Miller, Inc.Engineered in situ anaerobic reactive zones
US6168388 *Jan 21, 1999Jan 2, 2001Camco International, Inc.Dual pump system in which the discharge of a first pump is used to power a second pump
US6250390Jan 4, 1999Jun 26, 2001Camco International, Inc.Dual electric submergible pumping systems for producing fluids from separate reservoirs
US6250392Aug 6, 1999Jun 26, 2001Muth Pump LlcPump systems and methods
US6254310May 8, 2000Jul 3, 2001Arcadis Geraghty & Miller, Inc.In-well air stripping and adsorption
US6280118Jun 9, 2000Aug 28, 2001Arcadis Geraghty & Miller, Inc.In situ reactive gate
US6283674May 8, 2000Sep 4, 2001Arcadis Geraghty & MillerIn-well air stripping, oxidation, and adsorption
US6322700Aug 2, 2000Nov 27, 2001Arcadis Geraghty & MillerEngineered in situ anaerobic reactive zones
US6325143 *Jun 22, 1999Dec 4, 2001Camco International, Inc.Dual electric submergible pumping system installation to simultaneously move fluid with respect to two or more subterranean zones
US6543543Jun 21, 2001Apr 8, 2003Muth Pump LlcPump systems and methods
US6622791 *Oct 23, 2001Sep 23, 2003Kelley & Sons Group InternationalMethod and apparatus for increasing fluid recovery from a subterranean formation
US6632364Jun 8, 2001Oct 14, 2003Arcadis G & MEngineered in situ anaerobic reactive zones
US6684956 *Sep 20, 2001Feb 3, 2004Wood Group Esp, Inc.Method and apparatus for producing fluids from multiple formations
US7086471 *Apr 9, 2002Aug 8, 2006Schlumberger Technology CorporationMethod and apparatus for controlling downhole flow
US7114572Jan 15, 2004Oct 3, 2006Schlumberger Technology CorporationSystem and method for offshore production with well control
US7748443 *May 8, 2008Jul 6, 2010William C. QuinlanDual packer for a horizontal well
US8037941Jun 10, 2010Oct 18, 2011Stephen H. AndersonDual packer for a horizontal well
US8371390Oct 13, 2011Feb 12, 2013Stephen H. AndersonDual packer for a horizontal well
US20040060705 *Sep 17, 2003Apr 1, 2004Kelley Terry EarlMethod and apparatus for increasing fluid recovery from a subterranean formation
US20040149447 *Apr 9, 2002Aug 5, 2004Gilles CantinMethod and apparatus for controlling downhole flow
US20050155767 *Jan 15, 2004Jul 21, 2005Batho Peter F.System and method for offshore production with well control
US20090277623 *Nov 12, 2009Quinlan William CDual packer for a horizontal well
US20100276161 *Jun 10, 2010Nov 4, 2010Quinlan William CDual packer for a horizontal well
US20140119965 *Jun 18, 2012May 1, 2014Rivener Musavirovich GabdullinDownhole pump assembly
USRE33102 *Jul 12, 1988Oct 31, 1989The Upjohn CompanyRemoval of volatile contaminants from the vadose zone of contaminated ground
EP0694676A1 *Jul 27, 1995Jan 31, 1996Elf Aquitaine ProductionInstallation for oil well
EP0922835A2 *Jul 27, 1998Jun 16, 1999Camco International Inc.System and method for recovering fluids from a wellbore
WO1996012866A1 *Oct 19, 1995May 2, 1996Muth Pump L.L.C.System for pumping well fluids
Classifications
U.S. Classification166/265, 166/313, 166/54.1
International ClassificationE21B43/14, E21B43/00, E21B43/12
Cooperative ClassificationE21B43/127, E21B43/14
European ClassificationE21B43/12B9C, E21B43/14