US20060245957A1 - Encapsulated bottom intake pumping system - Google Patents
Encapsulated bottom intake pumping system Download PDFInfo
- Publication number
- US20060245957A1 US20060245957A1 US11/108,050 US10805005A US2006245957A1 US 20060245957 A1 US20060245957 A1 US 20060245957A1 US 10805005 A US10805005 A US 10805005A US 2006245957 A1 US2006245957 A1 US 2006245957A1
- Authority
- US
- United States
- Prior art keywords
- assembly
- shroud
- pumping system
- pump assembly
- intake
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
- F04B47/06—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps having motor-pump units situated at great depth
Abstract
Disclosed is a bottom-intake pumping system that includes a pump assembly and a motor that drives the pump assembly with a driveshaft assembly. The bottom-intake pumping system includes a first thrust bearing that supports the driveshaft assembly on a first side of the pump assembly and a second thrust bearing that supports the driveshaft assembly on a second side of the pump assembly. The bottom-intake pumping system also includes a shroud assembly and a discharge pipe. The shroud assembly has a lower shroud hanger configured for rigid attachment at a selected location on the pump assembly, a shroud body connectable to the lower shroud hanger and an upper shroud hanger connectable to the shroud body. The upper shroud hanger is configured for sliding engagement with a discharge pipe.
Description
- This invention relates generally to the field of downhole pumping systems, and more particularly to encapsulated bottom intake pumping systems.
- Submersible pumping systems are often deployed into wells to recover petroleum fluids from subterranean reservoirs. Submersible pumping systems often include an electric motor coupled to a pump assembly. When driven by a motor, the pump assembly moves fluids from the reservoir to surface facilities through production tubing. In many installations, the discharge from the pump assembly is connected directly to the production tubing. In these installations, the motor is commonly placed below the pump assembly at the terminal end of the equipment string.
- In other applications, however, it is desirable to place the pump assembly below the electric motor. Prior art “bottom intake” pumping systems are often used in combination with a shroud and an intake tailpipe to draw fluids from a lower well zone that has been isolated from the pump assembly by a packer. Although widely used, prior art bottom intake pumping systems are prone to mechanical failure. Furthermore, the shroud assemblies used to encapsulate bottom-intake pumping system must be custom fabricated under strict tolerances for proper fit. There is therefore a need for a more robust and easier to manufacture bottom intake pumping system.
- In a preferred embodiment, the present invention includes a bottom-intake pumping system having a pump assembly, a motor configured to drive the pump assembly and a driveshaft assembly for delivering power from the motor to the pump assembly. A first thrust bearing supports the driveshaft assembly on a first side of the pump assembly and a second thrust bearing supports the driveshaft assembly on a second side of the pump assembly.
- In another aspect, the preferred embodiment includes a shroud assembly and a discharge pipe. The shroud assembly preferably includes a lower shroud hanger configured for rigid attachment at a selected location on the pump assembly, a shroud body connectable to the lower shroud hanger and an upper shroud hanger connectable to the shroud body. The upper shroud hanger is preferably configured for sliding engagement with the discharge pipe.
-
FIG. 1 is a front view of a bottom-intake pumping system with a cross-sectional view of the shroud assembly constructed in accordance with a presently preferred embodiment. -
FIG. 2 is a partial cross-section view of the bottom-intake pumping system ofFIG. 1 depicting the internal components of the upper seal section, pump assembly and lower seal section of a preferred embodiment. -
FIG. 3 is a partial cross-sectional view of the pump assembly and lower seal section. -
FIG. 4 is a cross-sectional, exploded view of the shroud assembly ofFIG. 1 . -
FIG. 5 is a cross-sectional view of the shroud assembly ofFIG. 1 . - In accordance with a preferred embodiment of the present invention,
FIG. 1 shows a front perspective view of adownhole pumping system 100 attached toproduction tubing 102. Thedownhole pumping system 100 andproduction tubing 102 are disposed in awellbore 104, which is drilled for the production of a fluid such as water or petroleum. As used herein, the term “petroleum” refers broadly to all mineral hydrocarbons, such as crude oil, gas and combinations of oil and gas. Although thepumping system 100 is primarily designed to pump petroleum products, it will be understood that the present invention can also be used to move other fluids, which may be generically referred to as “wellbore fluids” while in the ground or “produced fluids” on the surface. - The
production tubing 102 connects thepumping system 100 to awellhead 106 located on the surface. Thewellhead 106 is in turn connected to surface facilities for transporting, refining or storing the produced fluids. It will be understood that, although each of the components of thepumping system 100 are primarily disclosed in a submersible application, some or all of the components disclosed herein can also be used in surface pumping operations. - The
pumping system 100 preferably includes some combination of apump assembly 108, amotor assembly 110, anupper seal section 112 and alower seal section 114. In a preferred embodiment, themotor assembly 110 is an electrical motor that receives its power from a surface-based source. Generally, themotor assembly 110 converts the electrical energy into mechanical energy, which is transmitted to thepump assembly 108 through a series of connected shafts that are collectively referred to as the driveshaft assembly 116 (not shown inFIG. 1 ). - The
pump assembly 108 transfers a portion of this mechanical energy to fluids within the wellbore, causing the wellbore fluids to move through theproduction tubing 102 to the surface. In a particularly preferred embodiment, thepump assembly 108 is a turbomachine that uses one or more impellers and diffusers to convert mechanical energy into pressure head. In an alternative embodiment, thepump assembly 108 is a progressive cavity (PC) pump that moves wellbore fluids with one or more screws or pistons. - In the preferred embodiment, the
pumping system 100 is configured as a shrouded bottom-intake pumping system in which thepump assembly 108 is located below themotor 110. Thepump assembly 108 preferably includes anintake 118 and adischarge 120. Thelower seal section 114 is preferably connected to theintake 118 at the terminal end of thepumping system 100. The upper seal section is preferably connected between thedischarge 120 and themotor 110. In this way, the upper andlower seal sections pump assembly 108. - The
pumping system 100 also includes ashroud assembly 122, adischarge pipe 124 and across-over 126. Thedischarge pipe 124 is preferably connected to theproduction tubing 102 and thecross-over 126. Thecross-over 126 is preferably secured to the top of themotor 110. In this way, theshroud assembly 122 creates a substantially sealed fluid path between thedischarge 120 and thecross-over 126 around the external surface of theupper seal section 112 and themotor 110. Fluids discharged from thepump assembly 108 are retained within theshroud assembly 122 and forced into thedischarge pipe 124 through thecross-over 126. Forcing wellbore fluids through theshroud assembly 122 lowers the temperature of the internal motor lubricant and motor components. Lower operating temperatures result in improved motor life and reduced levels of scaling. - Turning now to
FIG. 2 , shown therein is a cross-sectional view of theupper seal section 112. Theupper seal section 112 is designed to equalize the pressure inside themotor 110 with the pressure in the wellbore and to compensate for the expansion and contraction of motor lubricants due to changes in the temperature of themotor 110. In a presently preferred embodiment, theupper seal section 112 is configured as a labyrinth-type seal section that uses a tortuous fluid path and gravity separation to permit the expansion of motor lubricants while preventing contaminated well fluid from reaching themotor 110. In an alternate embodiment, theupper seal section 112 includes one or more elastomeric bags in addition to, or in place of, the labyrinth-type seal. The elastomeric bags function as a positive barrier between the motor lubricant and corrosive well fluids. Theupper seal section 112 preferably also includes an upper thrust bearing 128 that is designed to carry a portion of the axial thrust developed by thepump assembly 108. In a particularly preferred embodiment, the thrust bearing includes a rotatingrunner 130 bounded by first and secondstationary thrust pads - Turning to
FIG. 3 , shown therein is a cross-sectional depiction of thelower seal section 114. In the presently preferred embodiment, thelower seal section 114 is configured as a bag-type seal that includes anelastomeric bag 136. Theelastomeric bag 136 prevents wellbore fluids from thepump assembly 108 from contacting other internal components within thelower seal section 114. Although a singleelastomeric bag 136 is presently preferred, it will be understood that additionalelastomeric bags 136 can be used. In an alternate preferred embodiment, theelastomeric bag 136 is replaced by, or used in conjunction with, a labyrinth-type seal mechanism. - The
lower seal section 114 also includes a lower thrust bearing 138 that works in concert with the upper thrust bearing 128 to absorb mechanical shock induced in thedriveshaft assembly 116 during operation. Like the upper thrust bearing 128, the lower thrust bearing 138 preferably includes a rotatingrunner 140 and first andsecond thrust pads driveshaft assembly 116 andrunner 140 is limited by the first andsecond thrust pads driveshaft assembly 116 is supported by upper andlower thrust bearings pumping system 100. Supporting thedriveshaft assembly 116 on both ends of thepumping system 100 reduces the likelihood that thedriveshaft assembly 116 will become pinned or sheared when subjected to excessive downthrust or torque. - Turning now to
FIGS. 4 and 5 , shown therein are exploded and assembled elevational views, respectively, of theshroud assembly 122 and the associated other portions of thepumping system 100. In the presently preferred embodiment, theshroud assembly 122 includes alower shroud hanger 146, ashroud body 148 and anupper shroud hanger 150. Theshroud body 148 is preferably configured for mating engagement between thelower shroud hanger 146 and theupper shroud hanger 150. In a particularly preferred embodiment, theshroud body 148,upper shroud hanger 150 andlower shroud hanger 148 include threaded portions that permit a secure engagement. - The
lower shroud hanger 146 is preferably secured to thepump assembly 108 below thedischarge 120. In the presently preferred embodiment, thelower shroud hanger 148 is preferably a conventional shroud hanger that rigidly secures theshroud assembly 122 to thepump assembly 108. The attachment of conventional shroud hangers is well known in the art. Theshroud body 148 is preferably configured as an elongated cylinder having a length sufficient to extend above thecrossover 126 when secured to thelower shroud hanger 146. - The
upper shroud hanger 150 preferably includes acentral bore 152, a plurality ofcentral seals 154 and at least onepenetrator assembly 156. Thecentral bore 152 is preferably sized and configured to receive thedischarge pipe 124. Thecentral seals 154 are configured to engage thedischarge pipe 124 to form a substantially sealed connection between thedischarge pipe 124 and theupper shroud hanger 150. In a particularly preferred embodiment, thedischarge pipe 124 is a polished, non-upset pup-joint connected between the cross-over 126 and theproduction tubing 102. In this particularly preferred embodiment, thecentral seals 154 are configured as “o-rings” with an inner diameter substantially equivalent to the outer diameter of thedischarge pipe 124. The at least onepenetrator assembly 156 permits the introduction of power or signal cables into theshroud assembly 122. During assembly, cables from themotor 110 can be fed through theupper shroud hanger 150 as it is lowered onto thedischarge pipe 124. Theupper shroud hanger 150 can then be moved down the discharge pipe 124 a desired extent to connect the components within theshroud assembly 122. - Thus, unlike prior art shroud assemblies that are constructed at specific lengths to be secured at specific locations on the pumping system, the
shroud assembly 122 of the preferred embodiment can be constructed without requiring specific length and attachment points. With the sliding engagement of theupper shroud hanger 150 on thedischarge pipe 124, asingle shroud assembly 122 can be used to encapsulate a variety of pumpingsystems 100. - It is to be understood that even though numerous characteristics and advantages of various embodiments of the present invention have been set forth in the foregoing description, together with details of the structure and functions of various embodiments of the invention, this disclosure is illustrative only, and changes may be made in detail, especially in matters of structure and arrangement of parts within the principles of the present invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed. It will be appreciated by those skilled in the art that the teachings of the present invention can be applied to other systems without departing from the scope and spirit of the present invention.
Claims (18)
1. A bottom-intake pumping system comprising:
a pump assembly, wherein the pump assembly has an intake end and a discharge end;
a motor;
an upper seal section between the motor and the discharge end of the pump assembly;
a lower seal section adjacent the intake end of the pump assembly; and,
a shroud assembly.
2. The bottom-intake pumping system of claim 1 , wherein the shroud assembly is configured to encapsulate the motor, the upper seal assembly and the discharge end of the pump assembly.
3. The bottom-intake pumping system of claim 2 , wherein the shroud assembly further comprises:
a lower shroud hanger;
a shroud body; and
an upper shroud hanger, wherein the upper shroud hanger includes a central bore that is configured to slidingly receive a discharge pipe.
4. The bottom-intake pumping system of claim 3 , wherein the upper shroud hanger includes a plurality of o-rings coaxial with the central bore that are configured to engage the discharge pipe.
5. The bottom-intake pumping system of claim 3 , wherein the upper shroud hanger includes at least one penetrator assembly.
6. The bottom-intake pumping system of claim 1 , wherein the lower seal section includes a lower thrust bearing configured to oppose downthrust produced in a pumping operation.
7. The bottom-intake pumping system of claim 1 , wherein the upper seal section includes an upper thrust bearing configured to oppose downthrust produced in a pumping operation.
8. The bottom-intake pumping system of claim 1 , wherein the shroud assembly isolates the discharge end of the pump assembly from the wellbore.
9. A bottom-intake pumping system comprising:
a pump assembly, wherein the pump assembly has an intake end and a discharge end;
a motor;
an upper seal section between the motor and the discharge end of the pump assembly; and
a lower seal section adjacent the intake end of the pump assembly.
10. The bottom-intake pumping system of claim 9 , wherein the lower seal section includes a lower thrust bearing configured to oppose downthrust produced in a pumping operation.
11. The bottom-intake pumping system of claim 10 , wherein the upper seal section includes an upper thrust bearing configured to oppose downthrust produced in a pumping operation.
12. The bottom-intake pumping system of claim 9 , further comprising a shroud assembly, wherein the shroud assembly is configured to encapsulate the motor, the upper seal assembly and the discharge end of the pump assembly.
13. The bottom-intake pumping system of claim 12 , wherein the shroud assembly further comprises:
a lower shroud hanger;
a shroud body; and
an upper shroud hanger, wherein the upper shroud hanger includes a central bore that is configured to slidingly receive a discharge pipe.
14. The bottom-intake pumping system of claim 13 , wherein the upper shroud hanger includes a plurality of o-rings coaxial with the central bore that are configured to engage the discharge pipe.
15. The bottom-intake pumping system of claim 13 , wherein the upper shroud hanger includes at least one penetrator assembly.
16. The bottom-intake pumping system of claim 1 , wherein the shroud assembly isolates the discharge end of the pump assembly from the wellbore.
17. A bottom-intake pumping system comprising:
a pump assembly;
a motor configured to drive the pump assembly;
a driveshaft assembly for delivering power from the motor to the pump assembly;
a first thrust bearing that supports the driveshaft assembly above the pump assembly; and
a second thrust bearing that supports the driveshaft assembly below the pump assembly.
18. A shroud assembly for use in a bottom-intake pumping system having a pump assembly and a discharge pipe, the shroud assembly comprising:
a lower shroud hanger configured for rigid attachment at a selected location on the pump assembly;
a shroud body connectable to the lower shroud hanger; and
an upper shroud hanger connectable to the shroud body, wherein the upper shroud hanger is configured for sliding engagement with the discharge pipe.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/108,050 US20060245957A1 (en) | 2005-04-14 | 2005-04-14 | Encapsulated bottom intake pumping system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/108,050 US20060245957A1 (en) | 2005-04-14 | 2005-04-14 | Encapsulated bottom intake pumping system |
Publications (1)
Publication Number | Publication Date |
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US20060245957A1 true US20060245957A1 (en) | 2006-11-02 |
Family
ID=37234635
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/108,050 Abandoned US20060245957A1 (en) | 2005-04-14 | 2005-04-14 | Encapsulated bottom intake pumping system |
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US (1) | US20060245957A1 (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090053080A1 (en) * | 2007-08-24 | 2009-02-26 | Baker Hughes Incorporated | Collet adapter for a motor shroud |
US20110024123A1 (en) * | 2009-07-31 | 2011-02-03 | Baker Hughes Incorporated | Esp for perforated sumps in horizontal well applications |
WO2014107472A1 (en) * | 2013-01-02 | 2014-07-10 | Schlumberger Canada Limited | Bottom discharge electric submersible pump system and method |
US20150192141A1 (en) * | 2014-01-08 | 2015-07-09 | Summit Esp, Llc | Motor shroud for an electric submersible pump |
US9638015B2 (en) | 2014-11-12 | 2017-05-02 | Summit Esp, Llc | Electric submersible pump inverted shroud assembly |
US10125585B2 (en) | 2016-03-12 | 2018-11-13 | Ge Oil & Gas Esp, Inc. | Refrigeration system with internal oil circulation |
US10323751B2 (en) | 2015-12-04 | 2019-06-18 | General Electric Company | Seal assembly for a submersible pumping system and an associated method thereof |
US10677030B2 (en) | 2016-08-22 | 2020-06-09 | Saudi Arabian Oil Company | Click together electrical submersible pump |
US10865627B2 (en) | 2017-02-01 | 2020-12-15 | Saudi Arabian Oil Company | Shrouded electrical submersible pump |
US20230220750A1 (en) * | 2022-01-12 | 2023-07-13 | Saudi Arabian Oil Company | Encapsulated electric submersible pump |
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US4487299A (en) * | 1982-03-09 | 1984-12-11 | Trw Inc. | Protection apparatus for liquid-filled submergible motors and the like |
US5173022A (en) * | 1989-09-29 | 1992-12-22 | Societe Nationale Elf Aquitaine (Production) | Process for pumping a gas/liquid mixture in an oil extraction well and device for implementing the process |
US6033567A (en) * | 1996-06-03 | 2000-03-07 | Camco International, Inc. | Downhole fluid separation system incorporating a drive-through separator and method for separating wellbore fluids |
US6167965B1 (en) * | 1995-08-30 | 2001-01-02 | Baker Hughes Incorporated | Electrical submersible pump and methods for enhanced utilization of electrical submersible pumps in the completion and production of wellbores |
US6325143B1 (en) * | 1999-01-04 | 2001-12-04 | Camco International, Inc. | Dual electric submergible pumping system installation to simultaneously move fluid with respect to two or more subterranean zones |
US6357552B1 (en) * | 1998-10-22 | 2002-03-19 | Netzsch Oilfield Products Gmbh | Submersible pump assembly for downhole use |
US6457531B1 (en) * | 2000-06-09 | 2002-10-01 | Wood Group Esp, Inc. | Water separation system with encapsulated electric submersible pumping device |
US6595295B1 (en) * | 2001-08-03 | 2003-07-22 | Wood Group Esp, Inc. | Electric submersible pump assembly |
-
2005
- 2005-04-14 US US11/108,050 patent/US20060245957A1/en not_active Abandoned
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
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US4487299A (en) * | 1982-03-09 | 1984-12-11 | Trw Inc. | Protection apparatus for liquid-filled submergible motors and the like |
US5173022A (en) * | 1989-09-29 | 1992-12-22 | Societe Nationale Elf Aquitaine (Production) | Process for pumping a gas/liquid mixture in an oil extraction well and device for implementing the process |
US6167965B1 (en) * | 1995-08-30 | 2001-01-02 | Baker Hughes Incorporated | Electrical submersible pump and methods for enhanced utilization of electrical submersible pumps in the completion and production of wellbores |
US6033567A (en) * | 1996-06-03 | 2000-03-07 | Camco International, Inc. | Downhole fluid separation system incorporating a drive-through separator and method for separating wellbore fluids |
US6357552B1 (en) * | 1998-10-22 | 2002-03-19 | Netzsch Oilfield Products Gmbh | Submersible pump assembly for downhole use |
US6325143B1 (en) * | 1999-01-04 | 2001-12-04 | Camco International, Inc. | Dual electric submergible pumping system installation to simultaneously move fluid with respect to two or more subterranean zones |
US6457531B1 (en) * | 2000-06-09 | 2002-10-01 | Wood Group Esp, Inc. | Water separation system with encapsulated electric submersible pumping device |
US6595295B1 (en) * | 2001-08-03 | 2003-07-22 | Wood Group Esp, Inc. | Electric submersible pump assembly |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090053080A1 (en) * | 2007-08-24 | 2009-02-26 | Baker Hughes Incorporated | Collet adapter for a motor shroud |
US7810557B2 (en) * | 2007-08-24 | 2010-10-12 | Baker Hughes Incorporated | Collet adapter for a motor shroud |
US20110024123A1 (en) * | 2009-07-31 | 2011-02-03 | Baker Hughes Incorporated | Esp for perforated sumps in horizontal well applications |
US8316942B2 (en) | 2009-07-31 | 2012-11-27 | Baker Hughes Incorporated | ESP for perforated sumps in horizontal well applications |
GB2524413B (en) * | 2013-01-02 | 2017-02-22 | Schlumberger Holdings | Bottom discharge electric submersible pump system and method |
GB2524413A (en) * | 2013-01-02 | 2015-09-23 | Schlumberger Holdings | Bottom discharge electric submersible pump system and method |
WO2014107472A1 (en) * | 2013-01-02 | 2014-07-10 | Schlumberger Canada Limited | Bottom discharge electric submersible pump system and method |
US10100624B2 (en) | 2013-01-02 | 2018-10-16 | Schlumberger Technology Corporation | Bottom discharge electric submersible pump system and method |
US20150192141A1 (en) * | 2014-01-08 | 2015-07-09 | Summit Esp, Llc | Motor shroud for an electric submersible pump |
US9175692B2 (en) * | 2014-01-08 | 2015-11-03 | Summit Esp, Llc | Motor shroud for an electric submersible pump |
US9638015B2 (en) | 2014-11-12 | 2017-05-02 | Summit Esp, Llc | Electric submersible pump inverted shroud assembly |
US10323751B2 (en) | 2015-12-04 | 2019-06-18 | General Electric Company | Seal assembly for a submersible pumping system and an associated method thereof |
US10125585B2 (en) | 2016-03-12 | 2018-11-13 | Ge Oil & Gas Esp, Inc. | Refrigeration system with internal oil circulation |
US10677030B2 (en) | 2016-08-22 | 2020-06-09 | Saudi Arabian Oil Company | Click together electrical submersible pump |
US10865627B2 (en) | 2017-02-01 | 2020-12-15 | Saudi Arabian Oil Company | Shrouded electrical submersible pump |
US20230220750A1 (en) * | 2022-01-12 | 2023-07-13 | Saudi Arabian Oil Company | Encapsulated electric submersible pump |
US11802465B2 (en) * | 2022-01-12 | 2023-10-31 | Saudi Arabian Oil Company | Encapsulated electric submersible pump |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: WOOD GROUP ESP, INC., OKLAHOMA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BERRY, MICHAEL;KETTER, CHRIS;REEL/FRAME:016190/0163 Effective date: 20050413 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |