CN103321606B - Water plugging shielding method for low-permeability fractured reservoir oil well - Google Patents
Water plugging shielding method for low-permeability fractured reservoir oil well Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 97
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000000203 mixture Substances 0.000 claims abstract description 15
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- 230000035699 permeability Effects 0.000 claims description 16
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims description 12
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- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 6
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 claims description 5
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- 229920005551 calcium lignosulfonate Polymers 0.000 claims description 5
- RYAGRZNBULDMBW-UHFFFAOYSA-L calcium;3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Ca+2].COC1=CC=CC(CC(CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O RYAGRZNBULDMBW-UHFFFAOYSA-L 0.000 claims description 5
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- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Sealing Material Composition (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention discloses a water plugging shielding method for a low-permeability fractured reservoir oil well, which relates to the technical field of water plugging of oil wells used in oil exploitation and comprises the following steps: mixing 0.05-3 parts of shielding agent with 100 parts of carrier fluid; injecting the mixture into the stratum at the temperature of 0-90 ℃ to form shielding on the wall surface of the crack; mixing 0.1-1 part of main body plugging agent and 100 parts of clear water; injecting the main body plugging agent into the stratum at the temperature of 0-90 ℃ to plug the water outlet layer and the crack; clean water is used for replacing the main body plugging agent and entering the oil into a reservoir of the oil well; closing the well and waiting for coagulation; and (5) opening a well, pumping and putting into production. The method solves the technical problems that the plugging agent is easy to cause reservoir damage and the plugging agent material is wasted in a large amount when the conventional cage water plugging process is constructed, and opens up a new road for the water plugging technology of the low-permeability fractured water logging oil well.
Description
Technical field
The present invention relates to technical field of petroleum extraction; relate to specifically a kind of Fracture with low permeability oil reservoir oilwell water shutoff screen method; be mainly used in protecting hyposmosis oil-bearing reservoir in oilwell water shutoff process, reduce the waste that a large amount of invalid leak-off of blocking agent in injection process causes.
Background technology
In LOW PERMEABILITY OILFIELD DEVELOPMENT process, because the impact in formation fracture (natural microcrack and artificial fracturing crack) is developed and be subject to long-term Advance Water Injection, the anisotropism on stratum is extremely serious, injected water often oozes crack channelling along high, and involve the less permeable layer less than oil-containing, the water filling of this poor efficiency, not only affects crude oil recovery percent of reserves, and because the consumption of the energy, processing, the corrosion of pipeline etc. of production fluid have increased the cost recovering the oil. Ooze out water layer for shutoff is high or height oozes crack, disclose multiple method for blocking in prior art, wherein close with the present invention have:
1, publication number is CN1464173, the Chinese patent literature that open day is on December 31st, 2003 discloses a kind of modified tannin extract gel water-plugging technique that is applicable to high temperature and high salt oil deposit, adopt three slugs to inject water blockoff, the first slug is: diverting agent such as, it accounts for 10 ~ 20% of total injection, and after diverting agent injects, within 0.5 ~ 1.5h time, closing well is waited solidifying; The heavy dose of low viscosity blocking agent of the second slug host colloidal sol of follow-up injection is selectively entered to water layer, and it accounts for 70 ~ 80% of total injection; Thereafter the 3rd slug is cement, as sealing compound, accounts for 10 ~ 20% of total injection, makes blocking agent selectively enter water layer; Blocking agent the host high temperature resistant and resistance to high salinity of energy also has long-term thermal stability; The plugged zone forming has high pressure resistant formation water and washes away for a long time required intensity, thereby reaches the moisture content that reduces high temperature and high salt oil deposit oil recovery later stage oil well, increases oil production, the object reducing production costs.
2, simultaneously, also having publication number is CN86108877A, denomination of invention is the patent documentation of " Zirconium gel water sealing agent ", publication number is CN1177053A, denomination of invention is the patent documentation of " a kind of water plugging and profile controlling method of single-fluid process, two-fluid process combination ", with publication number be CN1204677A, denomination of invention is the patent documentation of " a kind of method for making of oil deposit water-stop gelatinizing liquid " etc.
But these existing water-plugging technologies are all to adopt general injection technology to inject from oil well or well blocking agent, and then closing well is waited solidifying. On the one hand, blocking agent, in injection process, often can enter hyposmosis oil-bearing reservoir, causes reservoir damage. On the other hand, due to a large amount of invalid leak-off of blocking agent in injection process, cause a large amount of wastes of blocking agent material. Above-mentioned document is the unexposed technology about Fracture with low permeability oil reservoir oilwell water shutoff screen method all.
Summary of the invention
The present invention is intended to for the existing defect of above-mentioned prior art, a kind of Fracture with low permeability oil reservoir oilwell water shutoff screen method is provided, adopt this method, before blocking agent is injected, it can form temporarily stifled screen layer at crack wall and prevent follow-up main body blocking agent injury oil-bearing reservoir, can reduce a large amount of wastes that follow-up main body blocking agent causes due to invalid leak-off in injection process simultaneously.
The present invention is by adopting following technical proposals to realize:
A kind of Fracture with low permeability oil reservoir oilwell water shutoff screen method, is characterized in that, comprises the steps:
A, get screener 0.05-3 part and carry 100 parts of liquid and be mixed to form screener suspension;
B, under 0-90 DEG C of condition, screener suspension is injected to stratum, hypotonic oil-bearing reservoir and crack wall are formed to shielding;
C, get 100 parts, main body blocking agent 0.1-1 part and clear water and be mixed to form main body blocking agent solution;
D, under 0-90 DEG C of condition, main body blocking agent solution is injected to stratum, height is oozed out to water layer and crack and form shutoff;
E, the whole mistakes of main body blocking agent solution in pit shaft are replaced in oil reservoir with clear water;
F, closing well are waited solidifying, and main body blocking agent solution, under the temporarily stifled shielding action of screener, under temperature 0-90 DEG C condition, reacts 3-24h; The high viscoelastic gel of rear formation, in blocking-up reservoir, the water stream channel of microcrack and matrix, realizes the effective shutoff to water logging oil well;
G, the suction that drives a well, by oil field suction standardization program, aspirate operation to oil well.
Described screener is merged and is formed by bisphenol A epoxide resin, the larch sulfonation tannin extract of mass ratio 10%-30% and the rosin of mass ratio 10%-40% of mass ratio 10%-50%.
Describedly carry the mixture that clear water that cation-modified polyacrylamide that liquid is 0.1%-0.5% by mass ratio and mass ratio are 0.5%-99.1% forms.
The mixture that described main body blocking agent is made up of cation-modified polyacrylamide, 2-acrylamide-2-methylpro panesulfonic acid AMPS and calcium lignosulfonate, the mixing quality ratio between them is: 10%-50%:10%-50%:10%-40%.
Described cation-modified polyacrylamide is existing product, is documented in " Northeast Petroleum University ", and author is Cui Liyan, and name is called in the Master's thesis of " the synthetic and flocculating property research of modified cation polyacrylamide ".
In described a and c step, screener and carry liquid, main body blocking agent and clear water are all to adopt cementing truck to mix.
In described b, d and e step, be all to adopt fracturing unit truck (joining fracturing blender truck) or cementing truck that screener suspension, main body blocking agent solution and clear water are injected to stratum.
In described b, d and e step, the infusion pressure of screener suspension, main body blocking agent solution and clear water is as the criterion to be no more than 80% of formation fracture pressure.
In described g step, after checking water plugging effect, directly go into operation or take other measure volume increase
Compared with prior art, the beneficial effect that the present invention reaches is as follows:
1, the present invention relies on stifled shielding and the oily molten characteristic temporarily of screener; by a, b, c, d, e, f, seven steps of g; while having solved existing general pouring-in water-plugging technology construction; blocking agent often can enter hyposmosis oil-bearing reservoir; cause reservoir damage; blocking agent causes the technical problem of a large amount of wastes of blocking agent material in injection process due to a large amount of invalid leak-offs simultaneously, and this water blockoff screen method is specially adapted to low permeability fractured water logging oil well, has a good application prospect.
2, in the present invention, screener is merged and is formed by bisphenol A epoxide resin, the larch sulfonation tannin extract of mass ratio 10%-30% and the rosin of mass ratio 10%-40% of mass ratio 10%-50%, select so specific component and proportioning, best composition and the parameter area after inventor's repeated tests, record through overtesting: screener temperature tolerance can reach 90 DEG C, under the condition of 0-90 DEG C, rock core water is blocked up to rate temporarily and can reach more than 90%; This screener is a kind of oil-soluble powdery solid simultaneously, and after water blockoff takes effect like this, reservoir is fuel-displaced can automatic dissolving screener, reduces reservoir damage.
3, in the present invention, the mixture that main body blocking agent is made up of cation-modified polyacrylamide, 2-acrylamide-2-methylpro panesulfonic acid AMPS and calcium lignosulfonate, mixing quality ratio between them is: 10%-50%:10%-50%:10%-40%, select so specific component and proportioning, best composition and the parameter area after inventor's repeated tests, prepared main body blocking agent is a kind of powdery solid, solution viscosity is less than 50mPa s at normal temperatures, after reaction, can form the gel that viscosity is greater than 10000mPa s.
4, in f step of the present invention, main body blocking agent solution, under the temporarily stifled shielding action of screener, under temperature 0-90 DEG C condition, has formed high viscoelastic gel after reaction 3-24h, can block the water stream channel of the interior microcrack of reservoir and matrix, realize the effective shutoff to water logging oil well.
Detailed description of the invention
Embodiment 1
The invention discloses a kind of Fracture with low permeability oil reservoir oilwell water shutoff screen method, comprise the steps:
A, get 0.1 part of screener and carry 100 parts of liquid and be mixed to form screener suspension;
B, under 50 DEG C of conditions, screener suspension is injected to stratum, hypotonic oil-bearing reservoir and crack wall are formed to shielding;
C, get 100 parts, 0.2 part of main body blocking agent and clear water and be mixed to form main body blocking agent solution;
D, under 50 DEG C of conditions, main body blocking agent solution is injected to stratum, height is oozed out to water layer and crack and form shutoff;
E, the whole mistakes of main body blocking agent solution in pit shaft are replaced in oil reservoir with clear water;
F, closing well are waited solidifying, under the temporarily stifled shielding action of main body blocking agent solution screener in a, under temperature 50 C condition, after reaction 24h, form high viscoelastic gel, and in blocking-up reservoir, the water stream channel of microcrack and matrix, realizes the effective shutoff to water logging oil well;
G, the suction that drives a well, by oil field suction standardization program, aspirate operation to oil well.
Described screener is merged and is formed by bisphenol A epoxide resin, the larch sulfonation tannin extract of mass ratio 20% and the rosin of mass ratio 40% of mass ratio 40%.
Describedly carry the mixture that cation-modified polyacrylamide that liquid is 0.3% by mass ratio and 99.7% clear water form.
In the present embodiment, the main body blocking agent adopting can be any Water Soluble Plugging Agent product conventional in this area.
In described a and c step, by the screener of weight portion with carry liquid, main body blocking agent and clear water adopts cementing truck to mix.
In described b, d and e step, be to adopt cementing truck that screener suspension, main body blocking agent solution and clear water are injected to stratum.
In described b, d and e step, when screener suspension, main body blocking agent solution and clear water are compressed into oil well microcrack and matrix, infusion pressure is as the criterion to be no more than 80% of formation fracture pressure.
In described g step, after checking water plugging effect, directly go into operation or take other measure volume increase.
Larch sulfonation tannin extract involved in the present invention belongs to existing chemical products, in the periodical file of author's section " performance evaluation of modified tannin extract High Temperature Plugging Agent " by name that to be Li Xiaojun etc. delivered on periodical " oilfield chemical " by name, disclose sulfonation larch extract, date issued is the 2nd phase in 2007.
Embodiment 2
The invention discloses a kind of Fracture with low permeability oil reservoir oilwell water shutoff screen method, comprise the steps:
A, get 2 parts of screeners and carry 100 parts of liquid and be mixed to form screener suspension;
B, under 60 DEG C of conditions, screener suspension is injected to stratum, hypotonic oil-bearing reservoir and crack wall are formed to shielding;
C, get 100 parts, 0.2 part of main body blocking agent and clear water and be mixed to form main body blocking agent solution;
D, under 60 DEG C of conditions, main body blocking agent solution is injected to stratum, height is oozed out to water layer and crack and form shutoff;
E, the whole mistakes of main body blocking agent solution in pit shaft are replaced in oil reservoir with clear water;
F, closing well are waited solidifying, under the temporarily stifled shielding action of main body blocking agent solution screener in a, under temperature 60 C condition, after reaction 24h, form high viscoelastic gel, and in blocking-up reservoir, the water stream channel of microcrack and matrix, realizes the effective shutoff to water logging oil well;
G, the suction that drives a well, by oil field suction standardization program, aspirate operation to oil well.
Described screener is merged and is formed by bisphenol A epoxide resin, the larch sulfonation tannin extract of mass ratio 20% and the rosin of mass ratio 30% of mass ratio 50%.
The mixture that the described clear water that carries cation-modified polyacrylamide that liquid is 0.5% by mass ratio and 99.5% forms.
The mixture that described main body blocking agent is made up of cation-modified polyacrylamide, 2-acrylamide-2-methylpro panesulfonic acid AMPS and calcium lignosulfonate, the mixing quality ratio between them is: 40%:20%:40%.
Described cation-modified polyacrylamide is existing product, is documented in " Northeast Petroleum University ", and author is Cui Liyan, and name is called in the Master's thesis of " the synthetic and flocculating property research of modified cation polyacrylamide ".
In described a and c step, by the screener of weight portion with carry liquid, main body blocking agent and clear water adopts cementing truck to mix.
In described b, d and e step, be to adopt fracturing unit truck that screener suspension, main body blocking agent solution and clear water are injected to stratum.
In described b, d and e step, when screener suspension, main body blocking agent solution and clear water are compressed into oil well microcrack and matrix, infusion pressure is to be no more than 80% of formation fracture pressure.
In described g step, after checking water plugging effect, directly go into operation or take other measure volume increase.
Embodiment 3
As preferred forms of the present invention, it comprises the steps:
A, get 0.2 part of screener and carry 100 parts of liquid and be mixed to form screener suspension;
B, under 60 DEG C of conditions, screener suspension is injected to stratum, hypotonic oil-bearing reservoir and crack wall are formed to shielding;
C, get 100 parts, 0.5 part of main body blocking agent and clear water and be mixed to form main body blocking agent solution;
D, under 60 DEG C of conditions, main body blocking agent solution is injected to stratum, height is oozed out to water layer and crack and form shutoff;
E, the whole mistakes of main body blocking agent solution in pit shaft are replaced in oil reservoir with clear water;
F, closing well are waited solidifying, under the temporarily stifled shielding action of main body blocking agent solution screener in a, under temperature 60 C condition, after reaction 24h, form high viscoelastic gel, and in blocking-up reservoir, the water stream channel of microcrack and matrix, realizes the effective shutoff to water logging oil well;
G, the suction that drives a well, by oil field suction standardization program, aspirate operation to oil well.
Described screener is merged and is formed by bisphenol A epoxide resin, the larch sulfonation tannin extract of mass ratio 30% and the rosin of mass ratio 20% of mass ratio 50%.
The mixture that the described clear water that carries cation-modified polyacrylamide that liquid is 0.2% by mass ratio and 99.8% forms.
The mixture that described main body blocking agent is made up of cation-modified polyacrylamide, 2-acrylamide-2-methylpro panesulfonic acid AMPS and calcium lignosulfonate, the mixing quality ratio between them is: 30%:30%:40%.
Described cation-modified polyacrylamide is existing product, is documented in " Northeast Petroleum University ", and author is Cui Liyan, and name is called in the Master's thesis of " the synthetic and flocculating property research of modified cation polyacrylamide ".
In described a and c step, by the screener of weight portion with carry liquid, main body blocking agent and clear water adopts cementing truck to mix.
In described b, d and e step, be to adopt fracturing unit truck that screener suspension, main body blocking agent solution and clear water are injected to stratum.
In described b, d and e step, when screener suspension, main body blocking agent solution and clear water are compressed into oil well microcrack and matrix, infusion pressure is to be no more than 80% of formation fracture pressure.
In described g step, after checking water plugging effect, directly go into operation or take other measure volume increase.
Specific implementation process of the present invention:
1,, according to the transformation of wellfracturing operation and refracturing and geologic feature data and consider blocking agent shutoff efficiency, calculate required screener and main body plug agent amount.
2,, according to laboratory experiment result, determine the optium concentration of screener and the each component of main body blocking agent.
3, according to the geologic feature of shutoff reservoir, formulate concrete plug water construction scheme, mainly determine that determining of discharge capacity and maximum pressure two parameters, especially pressure should be as the criterion to be no more than 80% of formation fracture pressure.
4, designed plug water construction according to plug water construction. When construction, first by clear water formation testing water suction situation, determine accordingly injection discharge capacity and the ground pump pressure of plug water construction, then, according to infusion scheme infusion screener and main body blocking agent, complete the plug water construction to service shaft.
5, according to oil field suction standardization program, oil well is aspirated to operation, checking water plugging effect.
Claims (7)
1. a Fracture with low permeability oil reservoir oilwell water shutoff screen method, is characterized in that: comprise the steps:
A, get screener 0.05-3 part and carry 100 parts of liquid and be mixed to form screener suspension;
B, under 0-90 DEG C of condition, screener suspension is injected to stratum, hypotonic oil-bearing reservoir and crack wall are formed to shielding;
C, get 100 parts, main body blocking agent 0.1-1 part and clear water and be mixed to form main body blocking agent solution;
D, under 0-90 DEG C of condition, main body blocking agent solution is injected to stratum, height is oozed out to water layer and crack and form shutoff;
E, the whole mistakes of main body blocking agent solution in pit shaft are replaced in oil reservoir with clear water;
F, closing well are waited solidifying, and main body blocking agent solution, under the temporarily stifled shielding action of screener, under temperature 0-90 DEG C condition, reacts 3-24h;
G, the suction that drives a well, by oil field suction standardization program, aspirate operation to oil well.
2. a kind of Fracture with low permeability oil reservoir oilwell water shutoff screen method according to claim 1, is characterized in that: described screener is merged and formed by bisphenol A epoxide resin, the larch sulfonation tannin extract of mass ratio 10%-30% and the rosin of mass ratio 10%-40% of mass ratio 10%-50%.
3. a kind of Fracture with low permeability oil reservoir oilwell water shutoff screen method according to claim 1, is characterized in that: described in carry the mixture that cation-modified polyacrylamide that liquid is 0.3% by mass ratio and 99.7% clear water form; Or the mixture that forms of the clear water of the cation-modified polyacrylamide that is 0.5% by mass ratio and 99.5%; Or the mixture that forms of the clear water of the cation-modified polyacrylamide that is 0.2% by mass ratio and 99.8%.
4. a kind of Fracture with low permeability oil reservoir oilwell water shutoff screen method according to claim 1, it is characterized in that: the mixture that described main body blocking agent is made up of cation-modified polyacrylamide, 2-acrylamide-2-methylpro panesulfonic acid AMPS and calcium lignosulfonate, the mixing quality ratio between them is: 10%-50%:10%-50%:10%-40%.
5. a kind of Fracture with low permeability oil reservoir oilwell water shutoff screen method according to claim 1, is characterized in that: in described a and c step, and screener and carry liquid, main body blocking agent and clear water are all to adopt cementing truck to mix.
6. a kind of Fracture with low permeability oil reservoir oilwell water shutoff screen method according to claim 1, is characterized in that: in described b, d and e step, be all to adopt fracturing unit truck or cementing truck that screener suspension, main body blocking agent solution and clear water are injected to stratum.
7. a kind of Fracture with low permeability oil reservoir oilwell water shutoff screen method according to claim 1, is characterized in that: in described b, d and e step, the infusion pressure of screener suspension, main body blocking agent solution and clear water is as the criterion to be no more than 80% of formation fracture pressure.
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| CN201310274563.5A CN103321606B (en) | 2013-07-02 | 2013-07-02 | Water plugging shielding method for low-permeability fractured reservoir oil well |
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| CN201310274563.5A CN103321606B (en) | 2013-07-02 | 2013-07-02 | Water plugging shielding method for low-permeability fractured reservoir oil well |
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| CN103865510A (en) * | 2014-03-10 | 2014-06-18 | 东北石油大学 | Thermal-recovery injection well gel single-liquid modifying and flooding agent and modifying and flooding method thereof |
| CN104453770B (en) * | 2014-12-04 | 2017-01-04 | 中国石油天然气股份有限公司 | Method for implementing selective water plugging in deep part of oil well by using waste diapers |
| CN105368425B (en) * | 2015-12-07 | 2018-01-05 | 中国石油天然气股份有限公司 | Oil well profile control agent and preparation and application thereof |
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