CN106468152B - A kind of thick oil horizontal well intensity adjustable shutoff method - Google Patents
A kind of thick oil horizontal well intensity adjustable shutoff method Download PDFInfo
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Abstract
The present invention provides a kind of thick oil horizontal well intensity adjustable shutoff method, which includes the following steps：A. stifled tune layer position is determined by testing water detection technology；Plug agent amount and construction parameter are calculated using ellipsoid model：The blocking agent is gelled plugging agent, gel particle suspension gelled plugging agent and high-strength gel particle blocking agent；B. first injection gelled plugging agent deep water blockoff, c. are then injected into gel particle suspension gelled plugging agent and realize that strength is blocked, and d. finally injects the sealing of high-strength gel particle blocking agent.It is suitble to cold adopt of thick oil horizontal well that can be efficiently entering earth formation deep with thermal recovery water blockoff, different slug combinations, has the characteristics that water blockoff intensity height, high temperature resistant, water blockoff success rate are high, produces term of validity length, while construction risk is greatly lowered.
Description
Technical field
The invention belongs to oil-field thick-oil production technique field more particularly to a kind of thick oil horizontal well shutoff methods.
Background technology：
Since thick oil horizontal well has apparent advantage, the horizontal well technologies such as recovery ratio height, control reserve height to have become compared with straight well
For one of the major technique of heavy oil development.With going deep into for oil field development, by edge-bottom water invasion, reservoir heterogeneity, more rounds
The factors such as handle up influence, and thick oil horizontal well is aqueous to be increased year by year, high water-cut well increases year by year.Thick oil horizontal well water blockoff becomes viscous crude
Oil reservoir development urgent problem to be solved.
Thick oil horizontal well water-plugging technology mainly uses water pack off and chemical water shutoff.Site operation uses same type blocking agent
When, it tends to be difficult to meet the remote requirement adjusted and closely blocked up；When using multiple slugs, often fail to realize blocking agent performance, plugging strength
Proper Match.Mainly have in terms of viscous crude water blockoff at present the particulate species such as traditional cements blocking agent, high temperature organogel, thermosetting resin,
Gel particle blocking agent, foam class water shutoff agent.The wherein particulate species such as traditional cements blocking agent there are grain sizes big, non-selectivity, easily causes
The shortcomings that reservoir damage；Thermosetting resin non-selectivity, curing rate are very sensitive to temperature, poor controllability；Gel particle is stifled
Agent can not inject earth formation deep；Foam class water shutoff agent plugging strength is low, to invading well bad adaptability in strong side water.
Easily it is detained in horizontal well well section in short, current thick oil horizontal well water blockoff is primarily present blocking agent, the resistance to temperature difference, blocks half
Diameter is small, construction risk is big, the low success rate of deficiency of water blockoff.
Invention content：
The purpose of the present invention, which is intended to overcome, overcomes the deficiencies of the prior art and provide that a kind of water blockoff intensity is high, water blockoff success rate
Height, construction risk are small, deep can be achieved blocks up tune, heat safe thick oil horizontal well intensity adjustable shutoff method.
The purpose of the present invention can be achieved by the following technical measures：
The shutoff method includes the following steps：
A. it applies PNN, SNP etc. to test water detection technology accurately to judge to be discharged position and remaining oil distribution situation, improves water blockoff
Specific aim, guidance optimization plug agent amount block slug, pressure control, stay and fill in length etc.；It improves to block water flooding degree, water breakthrough
The whole understanding of situation.
According to reservoir physical parameter, well section length, blocking agent performance characteristics, using ellipsoid model, optimization calculates classification note
The different plug agent amounts and construction parameter entered；
1. calculating plug agent amount using ellipsoid model
In formula, V-plug agent amount, m3；K-high permeable strip ratio, %；H-reservoir effective thickness, m；
R-blocking agent releases radius, m；L-screen casing segment length, m；Φ-effecive porosity, %；
2. construction parameter
Injection pressure:Blocking agent must be injected under the conditions of less than formation fracture pressure.When construction based on injection test pressure,
3~5MPa of pressure of climbing.It requires injection pressure to be slightly above discharged stressor layer simultaneously, ensures that the blocking agent of injection enters in the horizontal direction
Earth formation deep；
Injection rate:Consider that formation contaminant wants small, note speed wants low；The construction time is taken into account, therefore injection rate again cannot be too
It is low.Injection rate is optimized for 8~10m3/ h is advisable；
The blocking agent is gelled plugging agent, gel particle suspension gelled plugging agent and high-strength gel particle blocking agent；It should
Blocking agent has the characteristics that：60 DEG C of low temperature become can plastic, 200 DEG C are not broken glue, I grade of gelling strength, into deep solidification, the blocking agent
Injection is good, can enter water breakthrough channel forward position and form water blocking barrier；
B. gelled plugging agent deep water blockoff is first injected, the selective deep water blockoff in remote well area, the frozen glue class are carried out
The phenol-formaldehyde resin modified that modified polyacrylamide that blocking agent is 0.2~0.8 by weight percent, weight percent are 0.3~1.3
Crosslinking agent, the chromium class crosslinking agent that weight percent is 0.2~1.2 add water mixture to form；
60 DEG C of low temperature of the blocking agent can plastic, 200 DEG C not break glue, I grade of gelling strength, into deep solidification.The system is injected
Property it is good, can enter water breakthrough channel forward position formed water blocking barrier.
C. it is then injected into gel particle suspension gelled plugging agent and realizes that strength is blocked, hot setting is formed to have and centainly be oozed
Saturating rate blocks slug, the modified polypropene acyl that the gel particle suspension gelled plugging agent is 1~2 by weight percent
Amine, weight percent are 10~30, grain size is the cement of 400~800 mesh, weight percent is 0.2~0.8 phenolic resin,
The organic chrome cross linker that weight percent is 0.1~0.9 adds water mixture to form；
Crosslinking agent is added after modified polyacrylamide and small particle cement mixture in the blocking agent, improves gel particle suspension
Property and adsorption capacity, enhancing enter depth of stratum, form high intensity colloid mixture, not dehydration shrinkage at the formation temperature.Simultaneously
System 106um sieves rate, can be effectively by the sand screen that sand block precision is 130um, into ground layer depth up to 100%
Portion, absorption is resident, forms plug water construction main force water blockoff slug.
D. finally injection high-strength gel particle blocking agent sealing, quick dehydration consolidation, forms strength and seals in controllable time
Mouthful, modified polyacrylamide that the high-strength gel particle blocking agent is 1~2 by weight percent, weight percent 20
~40, grain size is that the cement plus water mixture of 400~800 mesh forms.
The blocking agent high temperature resistant, high intensity, thermostabilization, which changes with the concentration of solid phase particles, when effectively control suspends
Between, after injecting near wellbore zone, in controllable time, quick dehydration forms high-strength sealing, forms protective layer to preposed attributives, together
When the blocking agent have the characteristics that easily bore plug, processing time is short, be convenient for the later stage construction processing.
The purpose of the present invention can be also achieved by the following technical measures：
Further, the modified polyacrylamide, again that the gelled plugging agent described in b step is 0.4~0.6 by weight percent
The chromium class crosslinking agent that phenol-formaldehyde resin modified crosslinking agent that amount percentage is 0.7~0.9, weight percent are 0.7~0.9 adds water mixed
With into.
Further, the modification that the gel particle suspension gelled plugging agent described in step c is 1.4~1.6 by weight percent
Polyacrylamide, weight percent are 18~20, grain size is the cement of 400~800 mesh, weight percent is 0.4~0.6 to change
Property phenolic resin crosslinking agent, weight percent be 0.5~0.7 chromium class crosslinking agent add water mixture to form.
Further, the modification poly- third that the high-strength gel particle blocking agent described in Step d is 1.4~1.6 by weight percent
The cement plus water mixture that acrylamide, weight percent are 28~30, grain size is 400~800 mesh forms.
The present invention adjusted layer position using test water detection technology is clearly stifled before this, then ellipsoid model computational methods was used to optimize
Plug agent amount and construction parameter, it is different to blocking agent performance requirement again according to horizontal well reservoir different depth, adjust close block up in line with remote
Principle, take classification inject, give full play to blocking agent performance.It is injected separately into difference in earth formation deep, zone of transition, near wellbore zone
The blocking agent of type realizes the intensity adjustable water blockoff to change from weak to strong, first injects gelled plugging agent deep water blockoff, is then injected into gel particle
Suspension system realizes that strength is blocked, and finally injects the sealing of high-strength gel granular system.
The intensity adjustable shutoff method of the present invention can be suitble to thick oil horizontal well is cold to adopt and hot compared with current common water-plugging technology
Water blockoff is adopted, different slug combinations can be efficiently entering earth formation deep, have water blockoff intensity height, high temperature resistant, water blockoff success rate height, production
The feature of term of validity length, while construction risk is greatly lowered, it can be achieved that the stifled tune in deep.
Description of the drawings
Fig. 1 is that the plug agent amount optimization of the present invention calculates ellipsoid model schematic diagram.
Specific implementation mode：
Embodiment 1：
The shutoff method includes the following steps：
A. it applies PNN, SNP etc. to test water detection technology accurately to judge to be discharged position and remaining oil distribution situation, improves water blockoff
Specific aim, guidance optimization plug agent amount block slug, pressure control, stay and fill in length etc.；It improves to block water flooding degree, water breakthrough
The whole understanding of situation.
According to reservoir physical parameter, well section length, blocking agent performance characteristics, using ellipsoid model, optimization calculates classification note
The different plug agent amounts and construction parameter entered.
Plug agent amount optimization is calculated to be calculated using ellipsoid model：
In formula, V-plug agent amount (m3)；K-high permeable strip ratio (%)；H-reservoir effective thickness (m)；R-blocking agent
Release radius (m)；L-sieve tube segment (perforated interval) length (m)；Φ-active porosity (%).
Injection pressure:Blocking agent must be injected under the conditions of less than formation fracture pressure.When construction based on injection test pressure,
3~5MPa of pressure of climbing.It requires injection pressure to be slightly above discharged stressor layer simultaneously, ensures that the blocking agent of injection enters in the horizontal direction
Earth formation deep.
Injection rate:Consider that formation contaminant wants small, note speed wants low；The construction time is taken into account, therefore injection rate again cannot be too
It is low.Injection rate is optimized for 8m3/ h is advisable.
The blocking agent is gelled plugging agent, gel particle suspension gelled plugging agent and high-strength gel particle blocking agent；
B. it uses gelled plugging agent to squeeze, carries out the selective deep water blockoff in remote well area.The gelled plugging agent by
Phenol-formaldehyde resin modified crosslinking agent that modified polyacrylamide that weight percent is 0.8, weight percent are 0.3, weight percent
Than adding water mixture to form for 1.2 chromium class crosslinking agent；
C. gel particle suspension system is used to squeeze zone of transition, hot setting forms blocking with certain permeability
Slug.The gel particle suspension gelled plugging agent by weight percent be 1~2 modified polyacrylamide, weight percent
Than be 0.2 for cement that 10, grain size is 800 mesh, weight percent phenolic resin, weight percent be 0.9 Organic Chromium hand over
Connection agent adds water mixture to form；
D. high-strength gel granular system is used to squeeze near wellbore zone, quick dehydration consolidation, forms strong in controllable time
Power is sealed.Modified polyacrylamide that the high-strength gel particle blocking agent is 2 by weight percent, weight percent are
20, grain size is that the cement plus water mixture of 800 mesh forms.
Embodiment 2：
The shutoff method includes the following steps：
A. it applies PNN, SNP etc. to test water detection technology accurately to judge to be discharged position and remaining oil distribution situation, improves water blockoff
Specific aim, guidance optimization plug agent amount block slug, pressure control, stay and fill in length etc.；It improves to block water flooding degree, water breakthrough
The whole understanding of situation.
According to reservoir physical parameter, well section length, blocking agent performance characteristics, using ellipsoid model, optimization calculates classification note
The different plug agent amounts and construction parameter entered.
Plug agent amount optimization is calculated to be calculated using ellipsoid model：
In formula, V-plug agent amount (m3)；K-high permeable strip ratio (%)；H-reservoir effective thickness (m)；R-blocking agent
Release radius (m)；L-sieve tube segment (perforated interval) length (m)；Φ-active porosity (%).
Injection pressure:Blocking agent must be injected under the conditions of less than formation fracture pressure.When construction based on injection test pressure,
3~5MPa of pressure of climbing.It requires injection pressure to be slightly above discharged stressor layer simultaneously, ensures that the blocking agent of injection enters in the horizontal direction
Earth formation deep.
Injection rate:Consider that formation contaminant wants small, note speed wants low；The construction time is taken into account, therefore injection rate again cannot be too
It is low.Injection rate is optimized for 10m3/ h is advisable.
The blocking agent is gelled plugging agent, gel particle suspension gelled plugging agent and high-strength gel particle blocking agent；
B. it uses gelled plugging agent to squeeze, carries out the selective deep water blockoff in remote well area.The gelled plugging agent by
Phenol-formaldehyde resin modified crosslinking agent that modified polyacrylamide that weight percent is 0.2, weight percent are 1.3, weight percent
Than adding water mixture to form for 0.2 chromium class crosslinking agent；
C. gel particle suspension system is used to squeeze zone of transition, hot setting forms blocking with certain permeability
Slug.Modified polyacrylamide that the gel particle suspension gelled plugging agent is 1 by weight percent, weight percent are
30, the organic chrome cross linker that grain size is the cement of 400 mesh, weight percent is 0.8 phenolic resin, weight percent are 0.1
Water mixture is added to form；
D. high-strength gel granular system is used to squeeze near wellbore zone, quick dehydration consolidation, forms strong in controllable time
Power is sealed.Modified polyacrylamide that the high-strength gel particle blocking agent is 2 by weight percent, weight percent 20
~40, grain size is that the cement plus water mixture of 400~800 mesh forms.
Embodiment 3：
The shutoff method includes the following steps：
A. it applies PNN, SNP etc. to test water detection technology accurately to judge to be discharged position and remaining oil distribution situation, improves water blockoff
Specific aim, guidance optimization plug agent amount block slug, pressure control, stay and fill in length etc.；It improves to block water flooding degree, water breakthrough
The whole understanding of situation.
According to reservoir physical parameter, well section length, blocking agent performance characteristics, using ellipsoid model, optimization calculates classification note
The different plug agent amounts and construction parameter entered.
Plug agent amount optimization is calculated to be calculated using ellipsoid model：
In formula, V-plug agent amount (m3)；K-high permeable strip ratio (%)；H-reservoir effective thickness (m)；R-blocking agent
Release radius (m)；L-sieve tube segment (perforated interval) length (m)；Φ-active porosity (%).
Injection pressure:Blocking agent must be injected under the conditions of less than formation fracture pressure.When construction based on injection test pressure,
3~5MPa of pressure of climbing.It requires injection pressure to be slightly above discharged stressor layer simultaneously, ensures that the blocking agent of injection enters in the horizontal direction
Earth formation deep.
Injection rate:Consider that formation contaminant wants small, note speed wants low；The construction time is taken into account, therefore injection rate again cannot be too
It is low.Injection rate is optimized for 9m3/ h is advisable.
The blocking agent is gelled plugging agent, gel particle suspension gelled plugging agent and high-strength gel particle blocking agent；
B. it uses gelled plugging agent to squeeze, carries out the selective deep water blockoff in remote well area.The gelled plugging agent by
Phenol-formaldehyde resin modified crosslinking agent that modified polyacrylamide that weight percent is 0.5, weight percent are 0.8, weight percent
Than adding water mixture to form for 0.8 chromium class crosslinking agent；
C. gel particle suspension system is used to squeeze zone of transition, hot setting forms blocking with certain permeability
Slug.Modified polyacrylamide, weight percent of the gel particle suspension gelled plugging agent by weight percent for 1.5
For cement that 20, grain size is 800 mesh, weight percent be 0.5 phenolic resin, weight percent be 0.5 organic chrominum cross-linkage
Agent adds water mixture to form；
D. high-strength gel granular system is used to squeeze near wellbore zone, quick dehydration consolidation, forms strong in controllable time
Power is sealed.Modified polyacrylamide that the high-strength gel particle blocking agent is 1 by weight percent, weight percent are
40, grain size is that the cement plus water mixture of 400 mesh forms.
Embodiment 4：
The shutoff method includes the following steps：
A. it applies PNN, SNP etc. to test water detection technology accurately to judge to be discharged position and remaining oil distribution situation, improves water blockoff
Specific aim, guidance optimization plug agent amount block slug, pressure control, stay and fill in length etc.；It improves to block water flooding degree, water breakthrough
The whole understanding of situation.
According to reservoir physical parameter, well section length, blocking agent performance characteristics, using ellipsoid model, optimization calculates classification note
The different plug agent amounts and construction parameter entered.
Plug agent amount optimization is calculated to be calculated using ellipsoid model：
In formula, V-plug agent amount (m3)；K-high permeable strip ratio (%)；H-reservoir effective thickness (m)；R-blocking agent
Release radius (m)；L-sieve tube segment (perforated interval) length (m)；Φ-active porosity (%).
Injection pressure:Blocking agent must be injected under the conditions of less than formation fracture pressure.When construction based on injection test pressure,
3~5MPa of pressure of climbing.It requires injection pressure to be slightly above discharged stressor layer simultaneously, ensures that the blocking agent of injection enters in the horizontal direction
Earth formation deep.
Injection rate:Consider that formation contaminant wants small, note speed wants low；The construction time is taken into account, therefore injection rate again cannot be too
It is low.Injection rate is optimized for 8~10m3/ h is advisable.
The blocking agent is gelled plugging agent, gel particle suspension gelled plugging agent and high-strength gel particle blocking agent；
B. it uses gelled plugging agent to squeeze, carries out the selective deep water blockoff in remote well area.The gelled plugging agent by
Phenol-formaldehyde resin modified crosslinking agent that modified polyacrylamide that weight percent is 0.4, weight percent are 0.9, weight percent
Than adding water mixture to form for 0.7 chromium class crosslinking agent；
C. gel particle suspension system is used to squeeze zone of transition, hot setting forms blocking with certain permeability
Slug.Modified polyacrylamide, weight percent of the gel particle suspension gelled plugging agent by weight percent for 1.4
For cement that 20, grain size is 400 mesh, weight percent be 0.6 phenolic resin, weight percent be 0.5 organic chrome cross linker
Water mixture forms；
D. high-strength gel granular system is used to squeeze near wellbore zone, quick dehydration consolidation, forms strong in controllable time
Power is sealed.Modified polyacrylamide that the high-strength gel particle blocking agent is 1.6 by weight percent, weight percent are
28, grain size is that the cement plus water mixture of 800 mesh forms.
Embodiment 5：
The shutoff method includes the following steps：
A. it applies PNN, SNP etc. to test water detection technology accurately to judge to be discharged position and remaining oil distribution situation, improves water blockoff
Specific aim, guidance optimization plug agent amount block slug, pressure control, stay and fill in length etc.；It improves to block water flooding degree, water breakthrough
The whole understanding of situation.
According to reservoir physical parameter, well section length, blocking agent performance characteristics, using ellipsoid model, optimization calculates classification note
The different plug agent amounts and construction parameter entered.
Plug agent amount optimization is calculated to be calculated using ellipsoid model：
In formula, V-plug agent amount (m3)；K-high permeable strip ratio (%)；H-reservoir effective thickness (m)；R-blocking agent
Release radius (m)；L-sieve tube segment (perforated interval) length (m)；Φ-active porosity (%).
Injection pressure:Blocking agent must be injected under the conditions of less than formation fracture pressure.When construction based on injection test pressure,
3~5MPa of pressure of climbing.It requires injection pressure to be slightly above discharged stressor layer simultaneously, ensures that the blocking agent of injection enters in the horizontal direction
Earth formation deep.
Injection rate:Consider that formation contaminant wants small, note speed wants low；The construction time is taken into account, therefore injection rate again cannot be too
It is low.Injection rate is optimized for 8~10m3/ h is advisable.
The blocking agent is gelled plugging agent, gel particle suspension gelled plugging agent and high-strength gel particle blocking agent；
B. it uses gelled plugging agent to squeeze, carries out the selective deep water blockoff in remote well area.The gelled plugging agent by
Phenol-formaldehyde resin modified crosslinking agent that modified polyacrylamide that weight percent is 0.6, weight percent are 0.7, weight percent
Than adding water mixture to form for 0.9 chromium class crosslinking agent；
C. gel particle suspension system is used to squeeze zone of transition, hot setting forms blocking with certain permeability
Slug.Modified polyacrylamide, weight percent of the gel particle suspension gelled plugging agent by weight percent for 1.6
For cement that 18, grain size is 800 mesh, weight percent be 0.4 phenolic resin, weight percent be 0.7 organic chrominum cross-linkage
Agent water mixture forms；
D. high-strength gel granular system is used to squeeze near wellbore zone, quick dehydration consolidation, forms strong in controllable time
Power is sealed.Modified polyacrylamide that the high-strength gel particle blocking agent is 1.4 by weight percent, weight percent are
30, grain size is that the cement plus water mixture of 400 mesh forms.
Claims (4)
1. a kind of thick oil horizontal well intensity adjustable shutoff method, it is characterised in that the shutoff method includes the following steps：
A. stifled tune layer position is determined by testing water detection technology；Plug agent amount and construction parameter are calculated using ellipsoid model：
1. calculating plug agent amount using ellipsoid model
In formula, V-plug agent amount, m3；K-high permeable strip ratio, %；H-reservoir effective thickness, m；
R-blocking agent releases radius, m；L-screen casing segment length, m；Φ-effecive porosity, %；
2. construction parameter
Blocking agent is injected under the conditions of less than formation fracture pressure, and based on injection test pressure, climb 3~5MPa of pressure, notes simultaneously
Enter pressure and is slightly above discharged stressor layer；Injection rate is 8~10m3/h；
The blocking agent is gelled plugging agent, gel particle suspension gelled plugging agent and high-strength gel particle blocking agent；
B. first injection gelled plugging agent deep water blockoff, the gelled plugging agent are gathered by the modification that weight percent is 0.2~0.8
The chromium class that phenol-formaldehyde resin modified crosslinking agent that acrylamide, weight percent are 0.3~1.3, weight percent are 0.2~1.2
Crosslinking agent adds water mixture to form；
C. it is then injected into gel particle suspension gelled plugging agent and realizes that strength is blocked, the gel particle suspension gelled plugging agent
The modified polyacrylamide for being 1~2 by weight percent, weight percent are 10~30, grain size is 400~800 mesh cement,
The organic chrome cross linker that phenolic resin that weight percent is 0.2~0.8, weight percent are 0.1~0.9 add water mixture and
At；
D. finally injection high-strength gel particle blocking agent sealing, the high-strength gel particle blocking agent are 1 by weight percent
~2 modified polyacrylamide, the cement plus water mixture that weight percent is 20~40, grain size is 400~800 mesh form.
2. a kind of thick oil horizontal well intensity adjustable shutoff method according to claim 1, it is characterised in that the jelly described in b step
The modified phenolic that modified polyacrylamide that glue class blocking agent is 0.4~0.6 by weight percent, weight percent are 0.7~0.9
Resin cross-linking agent, the chromium class crosslinking agent that weight percent is 0.7~0.9 add water mixture to form.
3. a kind of thick oil horizontal well intensity adjustable shutoff method according to claim 1, it is characterised in that solidifying described in step c
Modified polyacrylamide that glue particle suspension gelled plugging agent is 1.4~1.6 by weight percent, weight percent be 18~
20, grain size is the cement of 400~800 mesh, weight percent is 0.4~0.6 phenolic resin, weight percent are 0.5~0.7
Organic chrome cross linker add water mixture to form.
4. a kind of thick oil horizontal well intensity adjustable shutoff method according to claim 1, it is characterised in that the height described in Step d
Modified polyacrylamide that strength gel particle blocking agent is 1.4~1.6 by weight percent, weight percent be 28~30, grain
Diameter is that the cement plus water mixture of 400~800 mesh forms.
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| CN109973062A (en) * | 2017-12-28 | 2019-07-05 | 东北石油大学 | A kind of five or three slug system of note of optimization |
| CN110118073B (en) * | 2019-06-12 | 2020-05-05 | 西南石油大学 | Multi-section plug grading plugging method suitable for fractured stratum |
| CN111577231A (en) * | 2020-05-14 | 2020-08-25 | 中国石油天然气股份有限公司 | Method for improving water plugging effect of flooded oil well through reverse profile control and flooding |
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| CN103498643A (en) * | 2013-10-23 | 2014-01-08 | 天津亿利科能源科技发展股份有限公司 | Composite slug deep water plugging method for oil pool with high water content |
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