CN112852393B - High-temperature-resistant plugging agent for thick oil horizontal well and water plugging method - Google Patents
High-temperature-resistant plugging agent for thick oil horizontal well and water plugging method Download PDFInfo
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- CN112852393B CN112852393B CN201911190140.9A CN201911190140A CN112852393B CN 112852393 B CN112852393 B CN 112852393B CN 201911190140 A CN201911190140 A CN 201911190140A CN 112852393 B CN112852393 B CN 112852393B
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 36
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000006260 foam Substances 0.000 claims abstract description 22
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 19
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 16
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 16
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000004202 carbamide Substances 0.000 claims abstract description 14
- 239000000945 filler Substances 0.000 claims abstract description 9
- 238000002347 injection Methods 0.000 claims description 18
- 239000007924 injection Substances 0.000 claims description 18
- 229920002401 polyacrylamide Polymers 0.000 claims description 10
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N Hydroquinone Chemical compound OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 claims description 8
- 239000002981 blocking agent Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000003208 petroleum Substances 0.000 claims description 5
- 229910000278 bentonite Inorganic materials 0.000 claims description 4
- 239000000440 bentonite Substances 0.000 claims description 4
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 4
- 230000007062 hydrolysis Effects 0.000 claims description 4
- 238000006460 hydrolysis reaction Methods 0.000 claims description 4
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 4
- 230000002195 synergetic effect Effects 0.000 abstract 1
- 238000005406 washing Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 26
- 239000007788 liquid Substances 0.000 description 5
- 239000010779 crude oil Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000003129 oil well Substances 0.000 description 3
- 239000000084 colloidal system Substances 0.000 description 2
- -1 polyoxypropylene Polymers 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/44—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing organic binders only
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
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Abstract
The invention provides a high-temperature-resistant plugging agent for a thickened oil horizontal well and a water plugging method. The high-temperature resistant plugging agent comprises water glass, urea and a filler, wherein the volume ratio of the water glass to the urea is 1-2.2, and the filler accounts for 20-25% of the total weight of the water glass and the urea. The residual plugging agent of the high-temperature resistant plugging agent in the shaft can be treated through washing operation, so that the construction safety is effectively ensured, and the construction process is simplified. The invention also provides a water plugging method for the thickened oil horizontal well, which takes the high-temperature resistant plugging agent as a near well slug, takes the nitrogen foam gel plugging agent as a far well slug, and utilizes the synergistic cooperation between the two plugging agents to ensure the water plugging effect of the horizontal well.
Description
Technical Field
The invention relates to the technical field of petroleum exploitation, in particular to a high-temperature-resistant plugging agent for a thick oil horizontal well and a water plugging method.
Background
The horizontal well mainly takes the encryption among heavy oil wells, the secondary evaluation of low-grade reserves in old areas, the layered development and the secondary development as the main parts, and has the characteristics of complex geological conditions, multiple oil reservoir types, wide application types and the like. However, with the increase of the production degree, the formation pressure is reduced, the problem of side bottom water invasion is gradually aggravated, the phenomena of high water content of produced liquid and even water flooding are common, and the water flooding problem is gradually expanded to adjacent wells on the same floor, so that water is produced in peripheral vertical wells or horizontal well areas. After the water breakthrough occurs in the horizontal well, the oil production of the oil well is greatly reduced, the water treatment cost is increased, and if no proper remedial measure is available, the well must be shut down too early, so that the waste of the productivity occurs. The horizontal well water plugging technology becomes a first measure for solving the problem.
The high-temperature resistant plugging agent adopted at present is generally a resin fly ash plugging agent or a dual-excitation inorganic gel plugging agent, the curing or gelling time is short, the plugging agent remained in a shaft needs to be drilled and ground subsequently, the construction process is complicated, and the measure cannot be implemented in a damaged well or a small cased well after overhaul. Therefore, the research on the special high-temperature-resistant plugging agent for the horizontal well has important significance for meeting the water plugging requirement of the thickened oil horizontal well.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a high-temperature resistant plugging agent for a thick oil horizontal well and a water plugging method. The high-temperature-resistant plugging agent and the water plugging method have the characteristics of wide raw material source, safe and simple construction, good water plugging effect, wide application prospect and the like.
In order to achieve the purpose, the invention provides a high-temperature-resistant plugging agent for a thick oil horizontal well, which comprises water glass, urea and a filler, wherein the volume ratio of the water glass to the urea is 1.
In the high-temperature resistant blocking agent, the modulus of the water glass is preferably 3 to 3.5.
In the above high-temperature resistant plugging agent, preferably, the filler includes bentonite powder.
In the above high temperature resistant blocking agent, preferably, the water glass, urea and the filler are subjected to a gelling and curing reaction to form the high temperature resistant blocking agent, and the reaction temperature of the gelling and curing reaction is greater than 80 ℃.
In the above high temperature resistant blocking agent, preferably, the curing time of the high temperature resistant blocking agent is more than 48 hours.
The invention also provides a water plugging method for the thickened oil horizontal well, which takes the high-temperature resistant plugging agent as a near well slug and takes the nitrogen foam gel plugging agent as a far well slug.
In a specific embodiment of the invention, the far well slug is a first injection slug and the near well slug is a second injection slug.
In the above method, preferably, the nitrogen foam gel plugging agent comprises nitrogen and a foam gel plugging agent in a volume ratio of 50 to 60. Wherein the nitrogen is under standard atmospheric pressure conditions;
the foamed gel plugging agent comprises the following components in percentage by weight, based on 100 percent of the total weight of the foamed gel plugging agent: 0.8-1% of partially hydrolyzed polyacrylamide, 1.3-1.5% of formaldehyde, 0.4-0.6% of hydroquinone, 0.6-0.8% of AE9901 (the main component is a nonionic surfactant of polyoxypropylene polyoxyethylene block polyether), 1.2-1.4% of petroleum sulfonate and the balance of water.
In the above-mentioned foam gel blocking agent, preferably, the degree of hydrolysis of the partially hydrolyzed polyacrylamide is 10 to 35%, and the molecular weight of the partially hydrolyzed polyacrylamide is 800 to 2500.
In the above method, preferably, the working pressure when injecting the nitrogen foam gel plugging agent is 17 to 20MPa, and the polyacrylamide solution with a mass concentration of 0.5% is replaced. More preferably, the injection amounts of the foam gel plugging agent and the nitrogen are respectively adjusted according to the construction pressure, and the specific adjustment mode is that if the injection pressure is lower than 17MPa, the injection amounts of the foam gel plugging agent and the nitrogen are correspondingly increased; on the contrary, if the injection pressure is higher than 20MPa, the injection amount of the foam gel plugging agent and the nitrogen is correspondingly reduced, wherein the injection amount of the foam gel plugging agent is 1000-1500 square, and the injection amount of the nitrogen is 6-9 ten thousand square.
In the above method, preferably, the injection amount of the high temperature resistant plugging agent is calculated according to a cylinder volume method, and the calculation formula is as follows: q = π R 2 h phi, wherein Q is the injection quantity of the high-temperature resistant plugging agent, and the unit is a square; pi is the circumference ratio, and is taken as 3.14; r is the treatment radius, and the unit is m; h is the length of a horizontal well section, and the unit is m; phi is the oil layer porosity, and the unit is%. More preferably, the treatment radius is 0.6 to 0.8m.
In the above method, preferably, the injection amount of the high temperature resistant plugging agent is 100 to 150 square.
The invention has the beneficial effects that:
1. the water plugging method for the thickened oil horizontal well provided by the invention takes the nitrogen foam gel plugging agent as a far well slug, and plays a role in regulating and plugging a water outlet channel; the high-temperature-resistant plugging agent is used as a near well slug, subsequent injection of steam is isolated, the far well slug is protected, the plugging strength of the plugging agent is improved, and the water plugging effect of the horizontal well is guaranteed.
2. The high-temperature-resistant plugging agent provided by the invention can be used for removing the residual plugging agent in a shaft through flushing operation after construction is finished, so that the plugging strength is improved, drilling and grinding procedures are omitted, the risk of measures is greatly reduced, and the construction process is simplified.
3. Compared with other water plugging methods of high-temperature resistant plugging agents, the high-temperature resistant plugging agent and the water plugging method provided by the invention have the characteristics of wide material source, safe and simple construction, good water plugging effect and wide application prospect.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
Example 1
The embodiment provides a water plugging method for a thick oil horizontal well, which specifically comprises the following steps:
for a certain oilfield Du 32-xing H357 well (crude oil density at 20 ℃ is 1.01 g/cm) 3 The viscosity of ground degassed crude oil at 50 ℃ is 96210mPa.s, the solidifying point is 23 ℃, the wax content is 4.9 percent, and the content of colloid and asphaltene is 49.04 percent. According to the classification standard of thick oil, the block belongs to super thick oil) water plugging construction, firstly, a foam gel plugging agent 1200 square is injected into an oil layer by using a water plugging pipe at the construction pressure of 17MPa, and nitrogen is 6 ten thousand square; then the injection amount is designed according to the treatment radius of 0.6m, and 100 parts of the high-temperature resistant plugging agent is injected at the construction pressure of 13 MPa.
The foam gel plugging agent comprises the following specific components by taking the foam gel plugging agent as 100 percent: 0.8% of partially hydrolyzed polyacrylamide, 1.3% of formaldehyde, 0.5% of hydroquinone, 0.6% of AE9901, 1.2% of petroleum sulfonate and the balance of water, wherein the hydrolysis degree of the partially hydrolyzed polyacrylamide is 10-35% and the molecular weight is 800-2500.
The high-temperature resistant plugging agent is prepared by mixing a mixture of 1:2 water glass (modulus is 3.2) and urea, and bentonite powder with weight of 20% of the total weight of the water glass and the urea, and the mixture is obtained by curing reaction for 70 hours at the temperature of more than 80 ℃.
Before the well measure, 22.3 tons of daily produced liquid and 0 ton of daily produced oil contain 99 percent of water; after the water shutoff measure is implemented, 21.5 tons of daily produced liquid and 10.3 tons of daily produced oil are produced, the water content is reduced to 52.1 percent, the production lasts for 259 days, and the oil is increased by comparison to 2667.7 tons.
Example 2
The embodiment provides a water plugging method for a thick oil horizontal well, which specifically comprises the following steps:
for a certain oilfield Dudu 813-Xingping 2 well (crude oil density at 20 ℃ is 1.0098g/cm 3 The viscosity of the ground degassed crude oil at 50 ℃ is 108880mPa.s, the freezing point is 26.1 ℃, the wax content is 2.3 percent, and the content of colloid and asphaltene is 51 percent. According to the classification standard of thickened oil, the block belongs to super-thickened oil) water plugging construction, firstly, a foam gel plugging agent 1500 square and nitrogen 9 ten thousand standard squares are injected into an oil layer by using a water plugging pipe at the construction pressure of 18 MPa; and then the injection amount is designed according to the treatment radius of 0.76m, and 150 parts of the high-temperature resistant plugging agent is injected at the construction pressure of 14 MPa.
The foam gel plugging agent comprises the following specific components by taking the total weight of the foam gel plugging agent as 100 percent: 1% of partially hydrolyzed polyacrylamide, 1.5% of formaldehyde, 0.6% of hydroquinone, 0.8% of AE9901, 1.4% of petroleum sulfonate and the balance of water, wherein the hydrolysis degree of the partially hydrolyzed polyacrylamide is 10-35% and the molecular weight is 800-2500.
The high-temperature resistant plugging agent is prepared by mixing a mixture of 1:2 water glass (modulus is 3.1) and urea, and bentonite powder with weight 23% of the total weight of the water glass and the urea, and the mixture is obtained through curing reaction for more than 80 hours and 72 hours.
23.6 tons of daily produced liquid, 2.4 tons of daily produced oil and 90 percent of water before the well measure; after the water shutoff measure is implemented, 20.7 tons of liquid are produced per day, 9.6 tons of oil are produced per day, the water content is reduced to 53.6 percent, the production lasts for 532 days, and the contrast oil increase is 3830.4 tons.
The embodiment 1 and the embodiment 2 show that the high-temperature-resistant plugging agent and the water plugging method for the thick oil horizontal well, provided by the invention, can improve the plugging strength, effectively adjust the plugging of the thick oil well, simplify the construction process and greatly increase the oil yield of the thick oil well.
Claims (11)
1. A water plugging method for a thick oil horizontal well is disclosed, wherein a high-temperature resistant plugging agent for the thick oil horizontal well is used as a near well slug, and a nitrogen foam gel plugging agent is used as a far well slug;
wherein, the nitrogen foam gel plugging agent comprises nitrogen and a foam gel plugging agent with the volume ratio of 50-60;
the nitrogen is under the condition of standard atmospheric pressure;
the foamed gel plugging agent comprises the following components by taking the total weight of the foamed gel plugging agent as 100 percent: 0.8-1% of partially hydrolyzed polyacrylamide, 1.3-1.5% of formaldehyde, 0.4-0.6% of hydroquinone, 0.6-0.8% of AE9901, 1.2-1.4% of petroleum sulfonate and the balance of water;
the high-temperature resistant plugging agent for the thickened oil horizontal well comprises water glass, urea and a filler, wherein the volume ratio of the water glass to the urea is 1-2.2, and the weight of the filler is 20-25% of the total weight of the water glass and the urea.
2. The method of claim 1, wherein the water glass has a modulus of 3-3.5.
3. The method of claim 1, wherein the filler comprises bentonite powder.
4. The method of any one of claims 1-3, wherein the water glass, urea, and filler undergo a gel-forming curing reaction to form the high temperature resistant plug, the temperature of the gel-forming curing reaction being greater than 80 ℃.
5. The method of claim 4, wherein the curing time of the high temperature resistant plugging agent is greater than 48 hours.
6. The method of claim 1, wherein the partially hydrolyzed polyacrylamide has a degree of hydrolysis of 10-35% and a molecular weight of 800-2500.
7. The method according to claim 1 or 6, wherein the working pressure when injecting the nitrogen foam gel plugging agent is 17-20MPa.
8. The method of claim 7, wherein the amount of the injected foam gel blocking agent is 1000-1500 squares and the amount of the injected nitrogen is 6-9 ten thousand squares.
9. The method according to claim 1, wherein the injection amount of the high temperature resistant plugging agent is calculated according to a cylinder volume method, and the calculation formula is as follows:
Q=πR 2 hФ，
wherein Q is the injection amount of the high-temperature resistant plugging agent, and the unit is a square; pi is the circumference ratio, and 3.14 is taken; r is the treatment radius, and the unit is m; h is the length of a horizontal well section, and the unit is m; phi is the oil layer porosity, and the unit is%.
10. The method of claim 9, wherein the treatment radius is 0.6-0.8m.
11. The method according to any one of claims 1 and 9 to 10, wherein the injection amount of the high temperature resistant plugging agent is 100 to 150 square.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911190140.9A CN112852393B (en) | 2019-11-28 | 2019-11-28 | High-temperature-resistant plugging agent for thick oil horizontal well and water plugging method |
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| CN201911190140.9A CN112852393B (en) | 2019-11-28 | 2019-11-28 | High-temperature-resistant plugging agent for thick oil horizontal well and water plugging method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1616590A (en) * | 2004-09-13 | 2005-05-18 | 中国科学院广州化学研究所 | Water glass high temperature blocking agent for oil production |
| CN106433587A (en) * | 2016-09-18 | 2017-02-22 | 中国石油大学(华东) | Combined plugging agent |
| CN108547591A (en) * | 2018-02-13 | 2018-09-18 | 中国石油天然气股份有限公司 | A kind of sieve tube completion thick oil horizontal well shutoff method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1616590A (en) * | 2004-09-13 | 2005-05-18 | 中国科学院广州化学研究所 | Water glass high temperature blocking agent for oil production |
| CN106433587A (en) * | 2016-09-18 | 2017-02-22 | 中国石油大学(华东) | Combined plugging agent |
| CN108547591A (en) * | 2018-02-13 | 2018-09-18 | 中国石油天然气股份有限公司 | A kind of sieve tube completion thick oil horizontal well shutoff method |
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