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WO2011099895A2 - Downhole circular liquid, gas or gas/liquid mixture flow restrictor - Google Patents

Downhole circular liquid, gas or gas/liquid mixture flow restrictor Download PDF

Info

Publication number
WO2011099895A2
WO2011099895A2 PCT/RU2011/000070 RU2011000070W WO2011099895A2 WO 2011099895 A2 WO2011099895 A2 WO 2011099895A2 RU 2011000070 W RU2011000070 W RU 2011000070W WO 2011099895 A2 WO2011099895 A2 WO 2011099895A2
Authority
WO
WIPO (PCT)
Prior art keywords
flow
flow restrictor
input
gas
restrictor
Prior art date
Application number
PCT/RU2011/000070
Other languages
French (fr)
Other versions
WO2011099895A3 (en
Inventor
Andrey Vladimirovich Shishov
Original Assignee
Andrey Vladimirovich Shishov
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Andrey Vladimirovich Shishov filed Critical Andrey Vladimirovich Shishov
Publication of WO2011099895A2 publication Critical patent/WO2011099895A2/en
Publication of WO2011099895A3 publication Critical patent/WO2011099895A3/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/34—Arrangements for separating materials produced by the well
    • E21B43/38—Arrangements for separating materials produced by the well in the well
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
    • E21B2200/02—Down-hole chokes or valves for variably regulating fluid flow

Definitions

  • This technical solution relates to hydrocarbon production/injection, more specifically, to the production/injection of gas/liquid hydrocarbon mixtures, and can be used for the operation of production/injection wells.
  • Prior art devices for uniform fluid supply from/to the reservoir have two supply channels: the inner one and the outer annular one.
  • the annular channel entrance has flow restrictor nozzles made from ceramic. Said flow restrictors operate to noticeably (by several tenths of MPa) reduce the downstream pressure. This is achieved due to high flow rates (approx. 50-100 mps) inside the ceramic insert flow channel.
  • a system for bottomhole bed fluid production via the production flow string comprising a bottomhole injector providing for the transfer of the bed fluids via the injector to the production flow string and preventing gas transfer via the injector, an annular space packer installed above said bottomhole injector to seal the well annular space in the radial direction relative to said production flow string, a vent pipe passing through a leak-proof opening in said packer so that gases pass via said vent pipe to the annular space above said packer, and one or more through openings connecting the annular space above said packer with said production flow string above said packer to provide for fluid transfer.
  • Said system may further comprise a check valve installed along said vent pipe so that the gas pressure below said packer maintains the required fluid level in the annular space above said packer and a check valve installed along said production flow string below said one or more through openings to prevent the fluid that has passed via said check valve from flowing back to said injector.
  • said system may further comprise one or more fluid exhaust lines communicating with said production flow string at a location above said check valve so that the fluid passes via said check valve and is discharged via the discharge port to said exhaust line at a location above said one or more through openings, following which said fluid is returned from said annular space to said production flow string via said one or more through openings at a location below said exhaust line discharge port.
  • said check valve is located below said packer inside said downhole injector.
  • a system for bottomhole bed fluid production via the production flow string comprising a top horizontal shaft diverting from the nearly vertical wellbore to the bed gas cap, a bottom horizontal shaft diverting from the nearly vertical wellbore to the fluid bearing bed, a bottomhole injector of the nearly vertical wellbore providing for the transfer of the bed fluids via the injector to the production flow string while preventing gas transfer via the injector, a packer installed in the nearly vertical wellbore above said bottomhole injector and above said bed gas cap to seal the well annular space in the radial direction relative to said production flow string so that gases not permitted to said production flow string via said injector remain in the bottomhole through the operation of said packer for passing via said top horizontal shaft, thus favoring the production of bed fluids from said bottom horizontal shaft.
  • Said system may further comprise a fluid delivery line passing from the surface via a sealed opening in said packer for the delivery of the injected gas collected below said packer via said top horizontal shaft for enhancing said gas cap, as well as one or more through openings to allow fluid transfer between the annular space above said packer and said production flow string above said packer for maintaining the fluid level in the annular space above said packer.
  • the restrictor device will be installed directly downstream of the throttle.
  • the function of the restrictor device is to reduce gas flow in case of its breakthrough from the oil-bearing bed to the production tubing or casing, where oil is collected for delivery to the surface with pumps.
  • Patent search has not revealed any devices which could be considered counterparts of the device developed herein.
  • the object of this technical solution is to increase the efficiency of preventing gas breakthrough from the oil-bearing bed to the well while simplifying the design and application of the device.
  • the downhole circular liquid, gas or gas/liquid mixture flow restrictor developed herein comprises at least one flow restricting unit the input section of which comprises at least one input channel, the output section of said flow restricting unit has a stepwise widening inner section and comprises at least one step with two outputs, and the orifice of said flow restricting unit is located between said input and output sections.
  • Said flow restrictor may comprise two or more of said restricting units connected in series. If said input section comprises more than one channels, then all said channels are preferably interconnected at the side opposite the input. Said interconnection may be, for example, in the form of a common channel to which all said input channels are connected.
  • said flow restrictor may comprise at least two or more flow channel widening steps arranged in series.
  • the flow channels with the widening steps may be arranged at an arbitrary angle to the longitudinal axis of said flow restrictor.
  • channel walls can be either converging or diverging.
  • Said orifice of said flow restricting unit may either have no side flow inputs or have at least one side flow input.
  • Such side flow input can be located at the output side of said flow restrictor and lead to at least one orifice of said flow restricting units.
  • the interface edges between said channel and said side flow input can be either sharp or rounded.
  • the ratio between the areas of said orifice section and said side flow input is arbitrary.
  • the number of flow restricting units and flow channel widening steps comprised therein is determined by the general specifications of the circular flow restrictor.
  • the flow through the flow restrictor is determined by the area of the orifice flow section and the flow rate therein.
  • the orifice flow rate is the highest because of the minimum flow section.
  • the static media pressure in the orifice may be, however, lower than at the flow restrictor output. It therefore becomes possible to divert the flow from the restrictor output to the restrictor orifice (the flow occurs from a higher pressure area to a lower pressure one).
  • the technical solution developed herein is illustrated in Figs. 1 , 2 and 3 showing device section view and device views without the case, respectively.
  • the device comprises the case 1 , the restrictor body 2, the restrictor channels 3, the openings 4 and the diverting pipe 5.
  • the device working principle is as follows. A liquid, gas or mixture flow reaches the devices via a circular channel formed by the diverting pipe 5 and the device case. Further, via the channel network of the restrictor 2 and the openings 4, the flow is directed to the diverting pipe 5.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Hydrogen, Water And Hydrids (AREA)
  • Pipe Accessories (AREA)

Abstract

This technical solution relates to hydrocarbon production/injection, more specifically, to the production/injection of gas/liquid hydrocarbon mixtures, and can be used for the operation of production/injection wells.

Description

Downhole Circular Liquid, Gas or Gas/Liquid Mixture Flow
Restrictor
This technical solution relates to hydrocarbon production/injection, more specifically, to the production/injection of gas/liquid hydrocarbon mixtures, and can be used for the operation of production/injection wells.
Prior art devices for uniform fluid supply from/to the reservoir have two supply channels: the inner one and the outer annular one. The annular channel entrance has flow restrictor nozzles made from ceramic. Said flow restrictors operate to noticeably (by several tenths of MPa) reduce the downstream pressure. This is achieved due to high flow rates (approx. 50-100 mps) inside the ceramic insert flow channel.
However, known devices fail to prevent gas breakthrough from the oil-bearing bed to the production tubing or casing.
It was suggested to prevent gas breakthrough from the oil- bearing bed to the well using (RU Patent 2196892) a system for bottomhole bed fluid production via the production flow string comprising a bottomhole injector providing for the transfer of the bed fluids via the injector to the production flow string and preventing gas transfer via the injector, an annular space packer installed above said bottomhole injector to seal the well annular space in the radial direction relative to said production flow string, a vent pipe passing through a leak-proof opening in said packer so that gases pass via said vent pipe to the annular space above said packer, and one or more through openings connecting the annular space above said packer with said production flow string above said packer to provide for fluid transfer. Said system may further comprise a check valve installed along said vent pipe so that the gas pressure below said packer maintains the required fluid level in the annular space above said packer and a check valve installed along said production flow string below said one or more through openings to prevent the fluid that has passed via said check valve from flowing back to said injector. Moreover, said system may further comprise one or more fluid exhaust lines communicating with said production flow string at a location above said check valve so that the fluid passes via said check valve and is discharged via the discharge port to said exhaust line at a location above said one or more through openings, following which said fluid is returned from said annular space to said production flow string via said one or more through openings at a location below said exhaust line discharge port. Preferably, said check valve is located below said packer inside said downhole injector.
Disadvantages of said system are its complexity, low efficiency, high metal consumption and hence large weight.
It was alternatively suggested to prevent gas breakthrough from the oil-bearing bed to the well using (RU Patent 2196892) a system for bottomhole bed fluid production via the production flow string comprising a top horizontal shaft diverting from the nearly vertical wellbore to the bed gas cap, a bottom horizontal shaft diverting from the nearly vertical wellbore to the fluid bearing bed, a bottomhole injector of the nearly vertical wellbore providing for the transfer of the bed fluids via the injector to the production flow string while preventing gas transfer via the injector, a packer installed in the nearly vertical wellbore above said bottomhole injector and above said bed gas cap to seal the well annular space in the radial direction relative to said production flow string so that gases not permitted to said production flow string via said injector remain in the bottomhole through the operation of said packer for passing via said top horizontal shaft, thus favoring the production of bed fluids from said bottom horizontal shaft. Said system may further comprise a fluid delivery line passing from the surface via a sealed opening in said packer for the delivery of the injected gas collected below said packer via said top horizontal shaft for enhancing said gas cap, as well as one or more through openings to allow fluid transfer between the annular space above said packer and said production flow string above said packer for maintaining the fluid level in the annular space above said packer.
Disadvantages of said system are its complexity, low efficiency, high metal consumption and hence large weight.
The above disadvantages of the known systems for preventing gas breakthrough from the oil-bearing bed to the well have necessitated the development of a restrictor device acting to prevent such breakthrough.
The restrictor device will be installed directly downstream of the throttle. The function of the restrictor device is to reduce gas flow in case of its breakthrough from the oil-bearing bed to the production tubing or casing, where oil is collected for delivery to the surface with pumps.
Patent search has not revealed any devices which could be considered counterparts of the device developed herein.
The object of this technical solution is to increase the efficiency of preventing gas breakthrough from the oil-bearing bed to the well while simplifying the design and application of the device.
It is suggested to achieve said object using a downhole liquid, gas or gas/liquid mixture flow restrictor. The downhole circular liquid, gas or gas/liquid mixture flow restrictor developed herein comprises at least one flow restricting unit the input section of which comprises at least one input channel, the output section of said flow restricting unit has a stepwise widening inner section and comprises at least one step with two outputs, and the orifice of said flow restricting unit is located between said input and output sections. Said flow restrictor may comprise two or more of said restricting units connected in series. If said input section comprises more than one channels, then all said channels are preferably interconnected at the side opposite the input. Said interconnection may be, for example, in the form of a common channel to which all said input channels are connected. In some embodiments said flow restrictor may comprise at least two or more flow channel widening steps arranged in series. The flow channels with the widening steps may be arranged at an arbitrary angle to the longitudinal axis of said flow restrictor. Also, channel walls can be either converging or diverging. Said orifice of said flow restricting unit may either have no side flow inputs or have at least one side flow input. Such side flow input can be located at the output side of said flow restrictor and lead to at least one orifice of said flow restricting units. The interface edges between said channel and said side flow input can be either sharp or rounded. The ratio between the areas of said orifice section and said side flow input is arbitrary.
The number of flow restricting units and flow channel widening steps comprised therein is determined by the general specifications of the circular flow restrictor.
There are several possible methods of preventing gas breakthrough from the oil-bearing bed to the well: reducing the flow section, developing high hydraulic resistance or installing further flow consumption devices inside the flow channel of the device, e.g. at the output side. The best flow restriction results are achieved if the above three methods are used in combination. Noteworthy, the device does not stop the flow but only restricts it to within the preset level. This allows preventing a failure of the entire facility by technical means. The flow restrictor design developed herein meets these requirements.
The flow through the flow restrictor is determined by the area of the orifice flow section and the flow rate therein. The orifice flow rate is the highest because of the minimum flow section. The static media pressure in the orifice may be, however, lower than at the flow restrictor output. It therefore becomes possible to divert the flow from the restrictor output to the restrictor orifice (the flow occurs from a higher pressure area to a lower pressure one).
At the orifice input such return flow partially displaces the main flow. This feature develops not only geometrical but also additional hydrodynamic restriction of the orifice flow section to increase the overall hydraulic resistance of the device and hence lower the flow through the flow restrictor.
The technical solution developed herein is illustrated in Figs. 1 , 2 and 3 showing device section view and device views without the case, respectively. The device comprises the case 1 , the restrictor body 2, the restrictor channels 3, the openings 4 and the diverting pipe 5. The device working principle is as follows. A liquid, gas or mixture flow reaches the devices via a circular channel formed by the diverting pipe 5 and the device case. Further, via the channel network of the restrictor 2 and the openings 4, the flow is directed to the diverting pipe 5.
The use of the flow restrictor developed herein allows one to almost completely minimize the consequences of gas breakthrough from the oil-bearing bed to the well, without complicating the downhole production equipment.

Claims

What is claimed is the useful model comprising a
1. Downhole circular liquid, gas or gas/liquid mixture flow restrictor comprising at least one flow restricting unit the input section of which comprises at least one input channel, the output section of said flow restricting unit has a stepwise widening inner section and comprises at least one step with two outputs, and the orifice of said flow restricting unit is located between said input and output sections.
2. Flow restrictor of Claim 1 wherein if said input section comprises more than one channels, then all said channels are preferably interconnected at the side opposite the input.
3. Flow restrictor of Claim 1 wherein said flow restrictor comprises two or more of said restricting units connected in series.
4. Flow restrictor of Claim 1 wherein said flow channels with the widening steps are arranged at an arbitrary angle to the longitudinal axis of said flow restrictor.
5. Flow restrictor of Claim 1 wherein said channel walls are either converging or diverging.
6. Flow restrictor of Claim 1 wherein said orifice of said flow restricting unit has no side flow inputs.
7. Flow restrictor of Claim 1 wherein said orifice of said flow restricting unit has at least one side flow input.
8. Flow restrictor of Claim 6 wherein said side flow input is located at the output side of said flow restrictor.
9. Flow restrictor of Claim 6 wherein said side flow input leads to at least one orifice of said flow restricting units.
10. Flow restrictor of Claim 1 wherein the interface edges between said channel and said side flow input are either sharp or rounded.
1 1. Flow restrictor of Claim 1 wherein the ratio between the areas of said orifice section and said side flow input is arbitrary.
PCT/RU2011/000070 2010-02-15 2011-02-07 Downhole circular liquid, gas or gas/liquid mixture flow restrictor WO2011099895A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RU2010104976 2010-02-15
RU2010104976 2010-02-15

Publications (2)

Publication Number Publication Date
WO2011099895A2 true WO2011099895A2 (en) 2011-08-18
WO2011099895A3 WO2011099895A3 (en) 2011-10-20

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ID=44367959

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/RU2010/000430 WO2011099888A1 (en) 2010-02-15 2010-08-03 Inflow control device for a production or an injection well
PCT/RU2011/000070 WO2011099895A2 (en) 2010-02-15 2011-02-07 Downhole circular liquid, gas or gas/liquid mixture flow restrictor

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Application Number Title Priority Date Filing Date
PCT/RU2010/000430 WO2011099888A1 (en) 2010-02-15 2010-08-03 Inflow control device for a production or an injection well

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017083295A1 (en) * 2015-11-09 2017-05-18 Weatherford Technology Holdings, LLC. Inflow control device having externally configurable flow ports and erosion resistant baffles

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9512702B2 (en) 2013-07-31 2016-12-06 Schlumberger Technology Corporation Sand control system and methodology
CN112324403B (en) 2019-08-05 2022-07-05 中国石油天然气股份有限公司 Well wall resistance increasing oil production method and device for improving energy utilization rate of injected gas

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4981175A (en) * 1990-01-09 1991-01-01 Conoco Inc Recirculating gas separator for electric submersible pumps
SU1629507A1 (en) * 1989-03-15 1991-02-23 Нижневартовский научно-исследовательский и проектный институт нефтяной промышленности Double-acting deep-well separator
RU2193652C2 (en) * 1999-12-20 2002-11-27 Петролео Бразилейро С.А. - Петробрас Gas separator and method of its operation

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7469743B2 (en) * 2006-04-24 2008-12-30 Halliburton Energy Services, Inc. Inflow control devices for sand control screens
US8312931B2 (en) * 2007-10-12 2012-11-20 Baker Hughes Incorporated Flow restriction device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU1629507A1 (en) * 1989-03-15 1991-02-23 Нижневартовский научно-исследовательский и проектный институт нефтяной промышленности Double-acting deep-well separator
US4981175A (en) * 1990-01-09 1991-01-01 Conoco Inc Recirculating gas separator for electric submersible pumps
RU2193652C2 (en) * 1999-12-20 2002-11-27 Петролео Бразилейро С.А. - Петробрас Gas separator and method of its operation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017083295A1 (en) * 2015-11-09 2017-05-18 Weatherford Technology Holdings, LLC. Inflow control device having externally configurable flow ports and erosion resistant baffles
RU2697440C1 (en) * 2015-11-09 2019-08-14 ВЕЗЕРФОРД ТЕКНОЛОДЖИ ХОЛДИНГЗ, ЭлЭлСи Inflow control device comprising outward-configurable flow windows and erosion resistant deflectors

Also Published As

Publication number Publication date
WO2011099895A3 (en) 2011-10-20
WO2011099888A1 (en) 2011-08-18

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