CN102741500A - System, method and assembly for wellbore maintenance operations - Google Patents
System, method and assembly for wellbore maintenance operations Download PDFInfo
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- CN102741500A CN102741500A CN2010800628650A CN201080062865A CN102741500A CN 102741500 A CN102741500 A CN 102741500A CN 2010800628650 A CN2010800628650 A CN 2010800628650A CN 201080062865 A CN201080062865 A CN 201080062865A CN 102741500 A CN102741500 A CN 102741500A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000012423 maintenance Methods 0.000 title claims abstract description 9
- 239000012530 fluid Substances 0.000 claims abstract description 127
- 238000011084 recovery Methods 0.000 claims abstract description 61
- 238000007599 discharging Methods 0.000 claims description 100
- 230000002706 hydrostatic effect Effects 0.000 claims description 10
- 238000010992 reflux Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 12
- 238000005086 pumping Methods 0.000 description 10
- 229930195733 hydrocarbon Natural products 0.000 description 6
- 150000002430 hydrocarbons Chemical class 0.000 description 6
- 238000005065 mining Methods 0.000 description 6
- 238000005553 drilling Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 239000004215 Carbon black (E152) Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 2
- 239000003027 oil sand Substances 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 241000184339 Nemophila maculata Species 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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Classifications
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- 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
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
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- 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)
- Lubricants (AREA)
- Prostheses (AREA)
Abstract
Methods for performing a wellbore maintenance operation on a system of wellbores used for improved oil recovery are disclosed. A plurality of wellbores are drilled and perforated to receive production fluids from a reservoir. The wellbores are fluidly connected to a production well that is drilled to a depth below the perforations of the wellbores. The production fluids drain and collect in the production well for delivery to the surface. A pump can be used for delivering the production fluids from the production well. During repair and maintenance operations, a fluid is injected into the production well for safely removing the pump components. The fluid is counterbalanced by the pressures in the connected wellbores such that the fluid does not rise above the perforations in the connected wellbores.
Description
The cross reference of related application
The sequence number that present patent application requires on December 15th, 2009 to submit to is 61/286,520 U.S. Provisional Application No., and this application is incorporated herein by reference in this integral body.
Technical field
The present invention relates to field mining equipment and method, especially relate to this equipment that in the low pressure well exploitation, uses and the method that comprises the well upkeep operation.
Background technology
In typical five-spot exploitation pattern, four recovery well are opened in the recovery well spaced around that is positioned at the center.Each well independent operation.Insert pump can be used for helping production fluid is promoted to ground, and said production fluid is typically You Heshui.The pump that is used for artificial lifting passes through to reduce borehole bottom pressure and exploitation is more oily economically thus, has prolonged oilfield life.Usually, the bottom of rod-type pumping tubing string is placed on the production range, so that allow fluid separation, and the possibility that tubing string is got clogged is minimum.The fluid level face should be positioned on the pumping line column inlet, and to avoid " hitting pump ", " hitting pump " can increase wearing and tearing, reduces equipment life.Because hydrostatic pressure head, this back pressure that can cause again conversely being applied on the reservoir raises.Through this hydrostatic pressure head is minimized, can improve coefficient of mining, prolong oilfield life and reserves.
Between very conventional well servicing operational period, well is usually by " compacting (killed) ", so that remove and repair rod-type pumping tubing string safely.Kill-job comprises injects high density, is generally water base fluid in recovery well, stop production fluid flowing to recovery well so that enough hydrostatic pressures to be provided.This fluid that is injected is drained into reservoir usually.In low-pressure gas well, insert pump is used for not allowing as much as possible water to get into reservoir.If a large amount of water gets into reservoir, the pressure in the reservoir possibly be high enough to make water to reflux away inadequately.This causes making these well second minings will spend a large amount of effort usually.Sometimes, or else well can successfully recover exploitation.
Summary of the invention
According to one aspect of the present invention, a kind of method that is used to carry out the well upkeep operation is disclosed.This method comprises provides discharging well and exploitation well.Said discharging well is perforated, so that said discharging well is from the exploitation band reception reservoir fluid of subsurface reservoir.Said exploitation well for example is communicated with through discharging tubing string fluid with said discharging well, makes the reservoir fluid that is received by said discharging well flow to said exploitation well.Inject fluid to said recovery well intraocular, till mobile stop of reservoir fluid from said discharging well to said exploitation well.On said exploitation well, carry out then and safeguard.
In one or more embodiment, in said exploitation well, inject fluid, be arranged in up to the fluid level face of said recovery well intraocular till the height on the perforation height of said discharging well.In one or more embodiment, arrive at the fluid that is injected before the perforation of said discharging well, fluid injects and stops.
In one or more embodiment, be provided with at least two discharging wells, in said exploitation well, inject fluid, be arranged in up to the fluid level face of said recovery well intraocular till the height on the perforation of said at least two discharging wells.In one or more embodiment, arrive at the fluid that is injected before arbitrary perforation of said at least two discharging wells, fluid injects and stops.
In one or more embodiment, injecting gas in said discharging well upwards refluxes through said exploitation well to force said fluid, and allows to flow to said exploitation well by the reservoir fluid that said discharging well receives.Then just can be from exploitation well exploitation reservoir fluid.
According to another aspect of the present invention, a kind of method that is used to carry out the well upkeep operation is disclosed.This method comprises provides borehole systems, and said borehole systems comprises discharging well, discharging tubing string and is used to exploit the exploitation well of reservoir fluid.Said discharging well comprises perforation, so that said discharging well is from the exploitation band reception reservoir fluid of subsurface reservoir.Said discharging tubing string extends between said discharging well and said exploitation well.The reservoir fluid that is received by said discharging well flows to said exploitation well through said discharging tubing string, so that exploitation.In said exploitation well, inject fluid, the hydrostatic pressure in said exploitation well enough makes the reservoir fluid stream that is received by said discharging well stop to flow to said exploitation well.On said exploitation well, carry out then and safeguard.
In one or more embodiment, in said exploitation well, inject till the height on fluid is arranged in said discharging well up to the fluid level face of said recovery well intraocular the perforation height.In one or more embodiment, arrive at the fluid that is injected before the perforation of said discharging well, fluid injects and stops.
In one or more embodiment, be provided with at least two discharging wells, in said exploitation well, inject fluid, be arranged in up to the fluid level face of said recovery well intraocular till the height on the perforation of said at least two discharging wells.In one or more embodiment, arrive at the fluid that is injected before arbitrary perforation of said at least two discharging wells, fluid injects and stops.
In one or more embodiment, injecting gas upwards refluxes through said exploitation well to force fluid in said discharging well, and allows to flow to said exploitation well by the reservoir fluid that said discharging well receives.Then just can be from said exploitation well exploitation reservoir fluid.
According to another aspect of the present invention, a kind of method that is used to carry out the well upkeep operation is disclosed.This method comprises provides discharging well and exploitation well.Said discharging well receives reservoir fluid from the exploitation band of subsurface reservoir.Said exploitation well is communicated with said discharging wellbore fluid, makes the reservoir fluid that is received by said discharging well flow to said exploitation well.In said exploitation well, inject fluid, the hydrostatic pressure in said exploitation well enough makes the reservoir fluid stream that is received by said discharging well stop to flow to till the said exploitation well.On said exploitation well, carry out then and safeguard.Injecting gas in said discharging well upwards refluxes through said exploitation well to force said fluid then, and allows to flow to said exploitation well by the reservoir fluid that said discharging well receives.Reservoir fluid is then exploited out from said exploitation well subsequently.
In one or more embodiment, said discharging well is communicated with the exploitation band fluid of reservoir through the perforation in the said discharging well.In said exploitation well, inject till the height on fluid is arranged in said discharging well up to the fluid level face of said recovery well intraocular the perforation height.
In one or more embodiment, said discharging well is communicated with the exploitation band fluid of reservoir through the perforation in the said discharging well.Arrive at the fluid that is injected before the perforation of discharging well, fluid injects and stops.
In one or more embodiment, be provided with at least two discharging wells, each said discharging well is communicated with the exploitation band fluid of reservoir through the perforation in the said discharging well.In said exploitation well, injecting fluid is arranged in up to the fluid level face of said recovery well intraocular till the height on the perforation of said two discharging wells at least.
In one or more embodiment, be provided with at least two said discharging wells, each discharging well is communicated with the exploitation band fluid of reservoir through the perforation in this discharging well.Arrive at the fluid that is injected before any perforation of said at least two discharging wells, fluid injects and stops.
Description of drawings
Fig. 1 is the schematic sectional view that extends to the recovery well configuration in the reservoir with hydrocarbon in the prior art.
Fig. 2 is the schematic sectional view that extends to the well configuration in the reservoir with hydrocarbon according to one aspect of the invention.
Fig. 3 is the schematic sectional view when being used for workover treatment that is configured in shown in Fig. 2.
The specific embodiment
With reference to prior art shown in Figure 1, a plurality of recovery well 11 is spaced apart, so that from reservoir 13 recovery of hydrocarbons.Recovery well is spaced apart, as shown in Figure 1 with typical five-point type exploitation pattern, so that from reservoir 13 recovery of hydrocarbons.In five dot patterns shown in Figure 1, each well 11 independent operations.Each well 11 generally includes a plurality of casing strings, and said casing string is inserted into after drilling well in the well, and bonding (cemented) is in place then.Said a plurality of casing string limits the external boundary or the outer tube 15 of well 11 jointly.For ease of explanation, a plurality of casing strings of outer tube 15 are expressed as single casing string in Fig. 1.Outer tube reaches the required degree of depth and makes well 11 extend to oil-sand 19 (that part that has hydrocarbon in the reservoir) afterwards in reservoir 13, said outer tube is bored a hole.Through forming perforation 17, fluid is communicated with between the oil-sand 19 that allows reservoir 13 and well 11 inside.
Each well 11 generally includes outer tube 15 inner a string exploitation sleeve pipe or the production tubings 21 that carry.Production tubing 21 has the opening that is used to receive production fluid (typically be oil, water is gentle) in its lower end.Packer sealing 23 flows through production tubing 21 to force the production fluid from reservoir 13 between production tubing 21 and outer tube 15.
Usually, the bottom of the rod-type pumping tubing string of pump assembly 25 is positioned on " production range ", so that allow the gas phase of production fluid to separate with the initial fluid between the liquid phase, and the possibility that tubing string is got clogged is minimum.Preferably, the fluid level of liquid remains on the pumping line column inlet in the production fluid, in order to avoid " hitting pump ", " hitting pump " can increase wearing and tearing, reduces the life-span of equipment.The inlet top that makes the liquid level of production fluid remain on pump assembly 25 has increased the hydrostatic pressure head in the production tubing 21, and this causes again on reservoir 13, forming back pressure conversely.This hydrostatic pressure head is reduced further to improve coefficient of mining and prolong the oilfield life relevant with reservoir 13.With reference to Fig. 2, a plurality of discharging wells 27 extend to the mining depth in the reservoir 13.Outer recovery well 11 in the five-point type exploitation pattern of discharging well 27 and Fig. 1 is similarly spaced apart.Discharging well 27 has the perforation 29 that in corresponding outer tube 31, forms, and said perforation is used for receiving production fluid from reservoir 13.Can be in the depth of reservoirs different with one of them perforation 29 of being associated of discharging well 27, so that the hydrocarbon of choosing wantonly exploitation with the perforation of another discharging well 27 29.Each discharging well 27 also comprises the packer sealing 32 that is positioned at outer tube 31 and is in perforation 29 tops.
Recovery well 11 ' is adjacent to extend in the reservoir 13 with discharging well 27.Recovery well 11 ' except brake specific exhaust emission well 27 deeper extends in the reservoir 13, this recovery well 11 ' adopt basically with Fig. 1 in well 11 identical parts accomplish drilling and well completion.A plurality of discharging tubing strings 33 extend between the end portion of the end portion of recovery well 11 ' and discharging well 27, make recovery well 11 ' with discharge well 27 fluids and be communicated with.Because the end portion of the end portion brake specific exhaust emission well 27 of recovery well 11 ' is darker, thus gravity help to be collected in the recovery well 11 ' from the production fluid of discharging well 27 so that utilize pump assembly 25 ' to collect.When at first boring discharging well 27 and recovery well 11 ', discharging tubing string 33 can form with directed-drilling technique; Perhaps discharging tubing string forms through in old filed, carrying out directed drilling between the existing well.Discharging tubing string 33 is preferably included in a string sleeve pipe or a string oil pipe of installing after the drilling well.
As shown in Figure 2, pump assembly 25 ' is arranged in the recovery well 11 '.Discharging well 27 does not comprise pump assembly 25 '.This has reduced and the relevant maintenance of five dot pattern wells shown in Figure 2 inherently.In addition, through only having single pump assembly 25 ' (Fig. 2), this also helps to reduce cost and the maintenance relevant with pump assembly 25 (Fig. 1).In Fig. 2, recovery well 11 ' is positioned at the center of a plurality of discharging wells 27.But recovery well 11 ' can be arranged in any position of five dot patterns.In addition, drainage well 27 also can be in other exploitation patterns with recovery well 11 '.In the system of Fig. 2, because a string production tubing that is not sealed in the outer tube 31, packer sealing 32 can be cheap packer sealing.This has guaranteed that also extra cost is saved and maintenance reduces.
As shown in Figure 2, recovery well 11 ' can have no perforation 17, makes recovery well 11 ' only be used for collecting and sending the production fluid of self-discharging well 27 like this.Have no perforation in the recovery well 11 ', this helps allowing the rod-type pumping tubing string of pump assembly 25 ' to be set at being lower than the perforation in the every other continuous discharging well 27.Through making the fluid level face be positioned at said perforation below, still to keep the fluid level face simultaneously and surpass rod-type tubing string inlet, this has realized minimum possible borehole bottom pressure in the well that links to each other.In such system, can realize high coefficient of mining, and realize extra reserves.
How Fig. 3 is favourable during workover treatment if showing assembly of the present invention.During well was carried out workover treatment, the rod-type pumping tubing string of pump assembly 25 ' normally was removed.In addition, for maintenance and repair pump 25 ' (these right and wrong are usually advised), can remove the rod-type pumping tubing string of pump assembly 25 '.
As foregoing, for the such operation of execution in conventional well configuration (the for example described recovery well 11 of Fig. 1), well is usually by " compacting ", so that safely the rod-type pumping tubing string of pump assembly is pulled." compacting " recovery well 11 (Fig. 1) is usually directed in recovery well 11, inject the highdensity water base fluid that is generally.This provides enough fluid pressures, to stop flow (that is, stop production fluid through perforation 17 flow into recovery well 11) of production fluid to recovery well 11.Being used for the injection fluid of " compacting " well 11 is drained into reservoir 13 usually.In low-pressure gas well, for example in recovery well shown in Figure 1 11 and recovery well 11 ' shown in Figure 2, pump assembly 25,25 ' is used for not allowing as much as possible water to get into reservoir 13.It is very important reducing the backflow that water gets into reservoir 13, if because a large amount of water gets into reservoir 13, thereby the pressure in the reservoir 13 possibly not high enoughly can not make water base injection fluid reflux go out (back out).When water base injection fluid flowed into reservoir 13, this caused making recovery well 11 to exploit a large amount of effort of needs cost once more usually, causes recovery well 11 or else can successfully recover exploitation sometimes.
According to the method for the invention, the recovery well 11 ' that links to each other of fluid and discharging well 27 are as manometric blind end.For " compacting " recovery well 11 ' and discharging well 27, can inject fluid in the well of recovery well 11 '.When the fluid level face of injection fluid in being collected in recovery well 11 ', discharging well 27 and discharging tubing string 33 and the fluid of exploiting out raise, said fluid compressed the separated gas on the said fluid that is in discharging well 27.As shown in Figure 3, can inject fluid in the recovery well 11 ', the fluid level face in recovery well 11 ' is arranged on the perforation 29 of all discharging wells 27 at least.Hydrostatic pressure adds that the pressure sum of compression gas phase in the discharging well 27 balances each other in hydrostatic pressure in the recovery well 11 ' and the discharging well 27.Thus, the fluid level face in the discharging well 27 is lower than the fluid level face in the recovery well 11 ', and the fluid in the discharging well can remain on perforation 29 belows.Because the fluid (production fluid and water base injection fluid) in the discharging well is lower than perforation 29, the risk that fluid flows in the reservoir 13 reduces greatly.So, when recovery well 11 ' is by " compacting ", can safeguard and repair, reduced making recovery well 11 ' return to the difficulty that exists in the exploitation state simultaneously.
In addition,, upwards reflux through exploiting well 11 ', therefore after carrying out maintenance, make recovery well 11 ' recover exploitation and be simplified with propelling fluid owing to can gas be injected in the discharging well 27.Therefore, this has reduced " compacting " fluid and has got into the possibility of perforation 29, and allows to recover to flow to exploitation well 11 ' by the reservoir fluid that discharging well 29 receives.Therefore, next just can be once more from exploitation well exploitation reservoir fluid.
Though only show the present invention with wherein some form, it will be apparent to those skilled in the art that the present invention is not limited to this, under situation about not departing from the scope of the present invention, can carry out various changes to this.
Claims (8)
1. method that is used to carry out the well upkeep operation, this method comprises:
(a) the discharging well is provided, said discharging well is perforated and forms perforation, thereby makes said discharging well receive reservoir fluid from the exploitation band of subsurface reservoir;
(b) the exploitation well is provided, said exploitation well is communicated with said discharging wellbore fluid, makes the reservoir fluid that is received by said discharging well flow to said exploitation well;
(c) inject fluid to the recovery well intraocular, till mobile stop of reservoir fluid from said discharging well to said exploitation well; With
(d) on the exploitation well, carry out maintenance.
2. the method for claim 1, wherein said exploitation well is communicated with said discharging wellbore fluid through the discharging tubing string, and said discharging tubing string extends between the bottom of the bottom of said discharging well and said exploitation well.
3. the method for claim 1, wherein inject fluid to said recovery well intraocular, be arranged in up to the fluid level face of said recovery well intraocular till the height on the perforation height of said discharging well in step (b).
4. the method for claim 1, wherein being infused in the fluid level face to the fluid of said recovery well intraocular in the step (b) stops before arriving the perforation in the said discharging well.
5. the method for claim 1, wherein
At least two discharging wells are provided in step (a), and
At step (b), inject fluid to said recovery well intraocular, be arranged in up to the fluid level face of said recovery well intraocular till the height on the perforation of said at least two discharging wells.
6. the method for claim 1, wherein
In step (a), provide at least two the discharging wells and
, the fluid of said recovery well intraocular stops before being infused in any perforation in said at least two the discharging wells of fluid level face arrival in the step (b).
7. the method for claim 1, said method also comprises:
(e), upwards reflux through said exploitation well to force said fluid, and make the reservoir fluid that receives by said discharging well flow to said exploitation well to said drainage well intraocular injecting gas; With
(f) from exploitation well exploitation reservoir fluid.
8. the method for claim 1, wherein at step (b), inject fluid to said recovery well intraocular, the hydrostatic pressure in said exploitation well enough makes till mobile the stopping of reservoir fluid from said discharging well to said exploitation well.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US28652009P | 2009-12-15 | 2009-12-15 | |
| US61/286,520 | 2009-12-15 | ||
| PCT/US2010/060541 WO2011084497A1 (en) | 2009-12-15 | 2010-12-15 | System, method and assembly for wellbore maintenance operations |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102741500A true CN102741500A (en) | 2012-10-17 |
Family
ID=44305708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010800628650A Pending CN102741500A (en) | 2009-12-15 | 2010-12-15 | System, method and assembly for wellbore maintenance operations |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20110203792A1 (en) |
| EP (1) | EP2513418A1 (en) |
| CN (1) | CN102741500A (en) |
| CA (1) | CA2784496A1 (en) |
| EA (1) | EA201290503A1 (en) |
| WO (1) | WO2011084497A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170226840A1 (en) * | 2014-08-04 | 2017-08-10 | Christopher James CONNELL | A well system |
| US11629576B2 (en) | 2020-02-10 | 2023-04-18 | Chevron U.S.A. Inc. | Multi-lateral well heel to toe development optimization |
| US11156073B2 (en) * | 2020-02-28 | 2021-10-26 | Saudi Arabian Oil Company | Drilling wellbores in a multilayered reservoir |
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2010
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- 2010-12-15 US US12/968,503 patent/US20110203792A1/en not_active Abandoned
- 2010-12-15 EP EP10842544A patent/EP2513418A1/en not_active Withdrawn
- 2010-12-15 WO PCT/US2010/060541 patent/WO2011084497A1/en active Application Filing
- 2010-12-15 CA CA2784496A patent/CA2784496A1/en not_active Abandoned
- 2010-12-15 CN CN2010800628650A patent/CN102741500A/en active Pending
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| US20030075322A1 (en) * | 2001-10-19 | 2003-04-24 | Cdx Gas, Llc. | Method and system for management of by-products from subterranean zones |
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Also Published As
| Publication number | Publication date |
|---|---|
| US20110203792A1 (en) | 2011-08-25 |
| EA201290503A1 (en) | 2012-12-28 |
| CA2784496A1 (en) | 2011-07-14 |
| EP2513418A1 (en) | 2012-10-24 |
| WO2011084497A1 (en) | 2011-07-14 |
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Application publication date: 20121017 |