CN112552890A - Inorganic gel profile control plugging agent for steam huff and puff steam channeling well - Google Patents

Inorganic gel profile control plugging agent for steam huff and puff steam channeling well Download PDF

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Publication number
CN112552890A
CN112552890A CN202011405299.0A CN202011405299A CN112552890A CN 112552890 A CN112552890 A CN 112552890A CN 202011405299 A CN202011405299 A CN 202011405299A CN 112552890 A CN112552890 A CN 112552890A
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steam
profile control
gel profile
inorganic gel
plugging agent
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CN202011405299.0A
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Chinese (zh)
Inventor
郝春雷
崔晓鹏
毛为成
常国栋
徐丽娜
张红华
崔灿
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China Petroleum and Chemical Corp
Petroleum Engineering Technology Research Institute of Sinopec Henan Oilfield Branch Co
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China Petroleum and Chemical Corp
Petroleum Engineering Technology Research Institute of Sinopec Henan Oilfield Branch Co
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Priority to CN202011405299.0A priority Critical patent/CN112552890A/en
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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
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/504—Compositions based on water or polar solvents
    • C09K8/5045—Compositions based on water or polar solvents containing inorganic compounds
    • 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
    • C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
    • C09K8/504—Compositions based on water or polar solvents
    • C09K8/506—Compositions based on water or polar solvents containing organic compounds

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  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Sealing Material Composition (AREA)

Abstract

The invention relates to an inorganic gel profile control plugging agent for a steam huff and puff steam channeling well, belonging to the technical field of drilling compositions. The inorganic gel profile control plugging agent comprises the following components in percentage by mass: 10-50% of water glass, 0-0.6% of low-temperature cross-linking agent, 2-8% of urea, 0-10% of inorganic solid filler and the balance of water. The inorganic gel profile control plugging agent is alkaline, and urea is hydrolyzed when the temperature exceeds 60 ℃ to reduce the pH value, so that SiO in the water glass is promoted3 2‑Forming a silicone grid structure to form a gel; and the isocyanic acid radical ion of the urea hydrolysate also participates in gelling reaction with SiO of the water glass3 2‑The formed grid can not only increase the grid strength of the colloid, but also lock the moisture in the colloid, so that the formed colloid can not shrink due to losing the moisture under the high-temperature condition, the strength of the colloid under the high-temperature condition can be ensured, and the plugging is prolongedAnd (4) a validity period.

Description

Inorganic gel profile control plugging agent for steam huff and puff steam channeling well
Technical Field
The invention relates to an inorganic gel profile control plugging agent for a steam huff and puff steam channeling well, belonging to the technical field of drilling compositions.
Background
After the heavy oil thermal recovery reservoir is produced for a long time, the stratum often forms a steam channeling channel. Steam flows to other production wells along the flow-crossing channel, a depletion layer is formed in the oil deposit, so that the energy of the steam cannot be fully applied to the crude oil, and invalid steam injection is caused. In order to solve the problem of the channeling, a chemical plugging agent is used for plugging the channeling channel. The chemical plugging agent needs to meet the following requirements: the cost is low, the composition can be used in large dose, and a deficit layer is filled; secondly, the plugging strength is high, and the plugging state can be kept under the steam injection pressure; the validity period is long, and the steam injection is still effective after multiple times and long time steam injection; high temperature resistance and effectiveness at steam injection temperature; the initial setting time is long, and large-dosage and long-time construction can be carried out; sixthly, the penetrability is good, and the oil can be injected into the deep part of an oil layer; and the oil reservoir can be gelled at the temperature to prevent the plugging agent from being pushed away from the plugging position under the steam injection pressure.
The currently commonly used chemical plugging agents mainly comprise nitrogen foams, inorganic particle plugging agents and organic gel plugging agents. The profile control construction of the nitrogen foam plugging agent is simple, the oil flow channel is not influenced, the plugging strength is weak, and the plugging effective period is short. The inorganic particle plugging agent has good plugging performance, but has the main problems that the operation cost is high because the pipe column needs to be moved, and the operation cost of the pipe column and the liquid preparation usually accounts for about half of the total cost; and the viscosity of the oil is high, and the injection pressure is easily overhigh when the dosage is large, so that the oil is difficult to enter the deep part of an oil reservoir. The organogel plugging agent can be constructed without moving a pipe column, has higher plugging strength and validity period than a nitrogen foam plugging agent, but the common organogel is not high-temperature resistant and has poorer plugging effect on a steam huff-puff well (about 250 ℃); for some high-temperature-resistant organogel plugging agents, the gelling temperature is high, the organogel plugging agent does not gel at the formation temperature, and the organogel plugging agent can be pushed away from a plugging position at the initial stage of steam injection, so that the plugging effect is difficult to realize.
Disclosure of Invention
The invention aims to provide an inorganic gel profile control plugging agent for a steam huff and puff steam channeling well, which not only can be used for movable pipe column construction, but also has higher plugging strength and longer validity period, and can resist the high temperature of 250 ℃.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
an inorganic gel profile control plugging agent for a steam stimulation steam channeling well comprises the following components in percentage by mass: 10-50% of water glass, 0-0.6% of low-temperature cross-linking agent, 2-8% of urea, 0-10% of inorganic solid filler and the balance of water.
The inorganic gel profile control plugging agent for the steam huff and puff steam channeling well is alkaline, urea contained in the inorganic gel profile control plugging agent is hydrolyzed when the temperature exceeds 60 ℃, and neutralization reaction is carried out to reduce the pH value, so that SiO in water glass is promoted3 2-Forming a silicone grid structure to form a gel; and the isocyanic acid radical ion of the urea hydrolysate also participates in gelling reaction with SiO of the water glass3 2-Forming a grid, and when the isocyanic acid radical ions participate in the gelling reaction, not only increasing the grid strength of the colloid, but also locking the moisture in the colloid, so that the formed colloid cannot shrink due to moisture loss under the high-temperature condition (higher than 100 ℃), the strength of the colloid under the high-temperature condition (higher than 100 ℃) can be ensured, and the effective period of plugging is prolonged.
The inorganic gel profile control plugging agent for the steam huff and puff steam channeling well can resist the high temperature of 250 ℃, has low cost, can be constructed without moving a pipe column, and can obviously reduce the construction cost. The urea is powder or granular, and can be used for agricultural and vehicle.
Preferably, the solid content of the water glass is 40-45%. The modulus of the water glass is 3.2-3.6.
The low temperature cross-linking agent gelatinizes the water glass at a temperature not exceeding 60 ℃. The low-temperature cross-linking agent enables the inorganic gel profile control plugging agent to play a cross-linking role at normal temperature, so that the inorganic gel profile control plugging agent can be gelled at a lower oil reservoir temperature (more than 30 ℃), further a certain plugging effect is provided at the initial stage of steam injection of a thermal recovery well, and the inorganic gel profile control plugging agent can be used for normally-recovered oil reservoirs; when the oil reservoir temperature is increased in the later stage of steam injection, the plugging effect can be kept and even enhanced, the plugging effect on steam channeling is ensured, and the plugging agent has a great popularization prospect. Preferably, the low-temperature crosslinking agent is one or any combination of ammonium chloride, calcium chloride, ethyl acetate, boric acid, ethanol and wood tar. Wherein, low-temperature cross-linking agents such as ammonium chloride, calcium chloride, boric acid and the like are ionized at normal temperature, so that the pH value of the system is reduced to promote the water glass to form gel; in addition to the influence of the pH value, ionization of the low-temperature crosslinking agent and the ionization product Ca2+Borate ions and the like can also promote the gelling of the water glass.
The inorganic solid filler can play a role in enhancing the colloid strength, and preferably, the inorganic solid filler is bentonite. The bentonite has good suspension property in water, can enhance the colloid strength, and can be mixed with SiO in water glass3 2-The reaction promotes the water glass to be gelatinized, does not influence the trafficability of the inorganic gel profile control plugging agent, can realize the construction of a static pipe column, and can also be used for the steam channeling plugging of a thermal production well which implements mechanical sand control measures. The initial setting time of the inorganic solid fillers such as bentonite can be shortened because of participating in the gelling reaction, so that the inorganic solid fillers can be omitted if the dosage is larger and the construction time is too long. More preferably, the bentonite is sodium bentonite.
Preferably, the mass percentages of the low-temperature crosslinking agent and the inorganic solid filler are not 0 at the same time. If the formation temperature exceeds 60 ℃, the mass percent of the low-temperature crosslinking agent can be 0, and if the low-temperature is lower than 60 ℃ but solid filler is used, the mass percent of the low-temperature crosslinking agent can also be 0. Preferably, the mass percentage of the low-temperature cross-linking agent is more than 0 and less than or equal to 0.6 percent. The use of the low-temperature cross-linking agent can lead the inorganic gel profile control plugging agent to be capable of gelling under the condition of lower than 60 ℃, and plugging the channeling passage before the temperature of the oil reservoir is increased by steam. The mass percentage of the low-temperature cross-linking agent is 0.1-0.6%.
In order to ensure the initial setting time of the inorganic gel profile control agent, only a small amount of low-temperature cross-linking agent can be added to carry out cross-linking at the temperature lower than 60 ℃, but the strength of the formed colloid is low, and the inorganic solid filler is added to play a good plugging role before the oil reservoir temperature rises. Preferably, the mass percent of the inorganic solid filler is 6-10%.
When the inorganic gel profile control plugging agent is prepared, the low-temperature crosslinking agent, the urea, the water glass and the bentonite in the formula amount are sequentially added into the water in the formula amount and uniformly mixed, so that the inorganic gel profile control plugging agent is obtained. When the inorganic gel profile control plugging agent is used in oil and water wells, the prepared solution can be directly injected from a sleeve, and after the solution is completely injected, the water is injected again to be replaced, and the wells are stewed; or the oil pipe can be pulled out, the profile control pipe column is lowered, the stratum is injected from the profile control pipe, and then the water is injected for replacement and the well is stewed.
Detailed Description
The present invention will be further described with reference to the following embodiments.
Example 1
The inorganic gel profile control plugging agent for the steam stimulation steam channeling well comprises the following components in percentage by mass: 20% of water glass, 0.6% of low-temperature cross-linking agent, 6% of urea and the balance of water; the solid content of the adopted water glass is 40 percent, and the modulus is 3.6; the low temperature crosslinking agent used is ammonium chloride.
Example 2
The inorganic gel profile control plugging agent for the steam stimulation steam channeling well comprises the following components in percentage by mass: 20% of water glass, 0.2% of low-temperature cross-linking agent, 5% of urea, 8% of sodium bentonite and the balance of water; the solid content of the adopted water glass is 42 percent, and the modulus is 3.5; the low-temperature cross-linking agent is wood tar.
Example 3
The inorganic gel profile control plugging agent for the steam stimulation steam channeling well comprises the following components in percentage by mass: 40% of water glass, 0.1% of low-temperature cross-linking agent, 6% of urea and the balance of water; the solid content of the adopted water glass is 45 percent, and the modulus is 3.6; the low temperature cross-linking agent used is boric acid.
Example 4
The inorganic gel profile control plugging agent for the steam stimulation steam channeling well comprises the following components in percentage by mass: 10% of water glass, 0.6% of low-temperature cross-linking agent, 8% of urea, 10% of sodium bentonite and the balance of water; the solid content of the adopted water glass is 45 percent, and the modulus is 3.6; the low temperature cross-linking agent used is calcium chloride.
Example 5
The inorganic gel profile control plugging agent for the steam stimulation steam channeling well comprises the following components in percentage by mass: 50% of water glass, 0.4% of low-temperature cross-linking agent, 2% of urea, 6% of sodium bentonite and the balance of water; the solid content of the adopted water glass is 40 percent, and the modulus is 3.3; the low temperature crosslinking agent used is ammonium chloride.
Example 6
The inorganic gel profile control plugging agent for the steam stimulation steam channeling well comprises the following components in percentage by mass: 30% of water glass, 0.6% of low-temperature cross-linking agent, 2% of urea, 6% of sodium bentonite and the balance of water; the solid content of the adopted water glass is 43 percent, the modulus is 3.2, and the adopted low-temperature cross-linking agent is ammonium chloride.
Example 7
The inorganic gel profile control plugging agent for the steam stimulation steam channeling well comprises the following components in percentage by mass: 30% of water glass, 2% of urea, 6% of sodium bentonite and the balance of water; the water glass used had a solids content of 43% and a modulus of 3.4.
When the inorganic gel profile control plugging agent in the above embodiment is constructed on site, water, a low-temperature crosslinking agent, urea, water glass, sodium bentonite and the like are sequentially added into a stirring tank according to the formula and the amount, the step of dissolving the low-temperature crosslinking agent is omitted if the low-temperature crosslinking agent is not used, the step of adding the low-temperature crosslinking agent is omitted, the urea is added for dissolving, the sodium glass is added, the sodium bentonite and the like are uniformly stirred, the sodium bentonite and the like are added, and the inorganic gel profile control plugging agent is obtained after stirring for 5min (the step of adding the sodium bentonite and the like is omitted if the sodium bentonite is not used and the stirring for 5min is omitted). When in use, the inorganic gel profile control plugging agent is directly injected from the casing by using a squeezing pump or a cement truck, and then the water is replaced after the inorganic gel profile control plugging agent is completely injected, and the well is stewed; or the oil pipe can be pulled out, the profile control pipe column is lowered, the inorganic gel profile control plugging agent is injected into the stratum from the profile control pipe, then the water is replaced, and the well is stewed, and the specific injection mode can be determined according to the situation.
Experimental example 1
The initial setting time of the inorganic gel profile control plugging agent in the embodiments 1 to 7 at 40 ℃ and the state after waiting for 48 hours are respectively evaluated, and the test results are shown in table 1;
TABLE 1 test results of initial setting time and after-setting 48h state of inorganic gel profile control plugging agent of Experimental example 1
Initial setting time/h Waiting for 48 hours
Example 1 12 Completely no flowing and completely gelatinizing
Example 2 8 Completely no flowing and completely gelatinizing
Example 3 24 Completely no flowing and completely gelatinizing
Example 4 24 Completely no flowing and completely gelatinizing
Example 5 4 Completely no flowing and completely gelatinizing
Example 6 4 Completely no flowing and completely gelatinizing
Example 7 12 Completely no flowing and completely gelatinizing
Combining with field experience, the injection time of each formula of the inorganic gel profile control agent is about 3min, and the field injection amount is mostly 100-200 formulas. Wherein, the initial setting time is short and can be used as a sealing slug. As can be seen from the data in Table 1, the initial setting time of examples 1 to 7 can satisfy the long-term construction requirements.
Experimental example 2
The plugging rates of the inorganic gel profile control plugging agents of examples 1 to 7 at 40 ℃ were evaluated by core plugging experiments, and the basic permeability of a sand-packed pipe and the plugging rate after being injected with 1PV plugging agent for waiting for 48 hours during the core plugging test of the inorganic gel profile control plugging agents of each example are shown in Table 2.
Table 2 test conditions and test results of core plugging test of experimental example 2
Base Permeability/Darcy of Sand-filled pipe Plugging Rate/%
Example 1 2.3 98.6
Example 2 11.7 99.8
Example 3 9.8 97.4
Example 4 7.5 99.1
Example 5 8.6 99.7
Example 6 6.7 99.8
Example 7 13.8 99.2
As can be seen from the data in Table 2, the inorganic gel profile control plugging agent of the embodiments 1 to 7 can meet the requirements of construction and plugging of a hot production well plugging site.
Experimental example 3
The inorganic gel profile control plugging agents of examples 1 to 7 were subjected to high temperature resistance experiments, and the volume shrinkage rate, plugging rate, and the like at 250 ℃ were measured.
When the volume shrinkage is tested, the inorganic gel profile control plugging agent is poured into a container, the container is maintained in a high-temperature high-pressure reaction kettle at 250 ℃ for 5 days, the volume of the rubber block is measured, and the shrinkage of the rubber block is calculated. The results are shown in Table 3, which illustrates that the inorganic gel profile control plugging agents of examples 1-7 can withstand high temperatures of 250 ℃. In addition, the compression strength of the gel block of the inorganic gel profile control plugging agent of example 3 after being cured at a high temperature of 250 ℃ was tested, and the measured compression strength was 0.6MPa, indicating that the plugging strength of the plugging agent was improved under the high temperature condition.
When the plugging rate is tested, a sand filling pipe (the basic permeability is shown in table 3) is filled, 1PV plugging agent is injected, and then the high-temperature high-pressure reaction kettle is maintained for 5 days at 250 ℃, wherein the plugging rate is shown in table 3.
Table 3 volume shrinkage test results and conditions and results of plugging rate test of experimental example 3
Figure BDA0002813899570000051
Figure BDA0002813899570000061
Since the temperature was mostly around 250 ℃ when the in-situ steam was just injected into the oil layer, the data in table 3 indicate that the inorganic gel profile control plugging agents of examples 1 to 7 can be used at the steam throughout temperature.

Claims (9)

1. An inorganic gel profile control plugging agent for a steam stimulation steam channeling well, which is characterized by comprising the following components in percentage by weight: the composite material comprises the following components in percentage by mass: 10-50% of water glass, 0-0.6% of low-temperature cross-linking agent, 2-8% of urea, 0-10% of inorganic solid filler and the balance of water.
2. The inorganic gel profile control plugging agent for a steam stimulated steam channeling well according to claim 1, wherein: the solid content of the water glass is 40-45%.
3. The inorganic gel profile control plugging agent for a steam stimulated steam channeling well according to claim 1, wherein: the modulus of the water glass is 3.2-3.6.
4. The inorganic gel profile control plugging agent for a steam stimulated steam channeling well according to claim 1, wherein: the low-temperature cross-linking agent is one or any combination of ammonium chloride, calcium chloride, ethyl acetate, boric acid, ethanol and wood tar.
5. The inorganic gel profile control plugging agent for a steam stimulated steam channeling well according to claim 1, wherein: the inorganic solid filler is bentonite.
6. The inorganic gel profile control plugging agent for a steam stimulated steam channeling well according to claim 5, wherein: the bentonite is sodium bentonite.
7. The inorganic gel profile control plugging agent for a steam stimulated steam channeling well according to claim 1, wherein: the mass percentage of the low-temperature cross-linking agent is more than 0 and less than or equal to 0.6 percent.
8. The inorganic gel profile control plugging agent for steam stimulated steam channeling well according to any one of claims 1 to 7, wherein: the mass percentage of the inorganic solid filler is 6-10%.
9. The inorganic gel profile control plugging agent for steam stimulated steam channeling well according to any one of claims 1 to 5, wherein: the mass percentages of the low-temperature cross-linking agent and the inorganic solid filler are not 0 at the same time.
CN202011405299.0A 2020-12-02 2020-12-02 Inorganic gel profile control plugging agent for steam huff and puff steam channeling well Pending CN112552890A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4074757A (en) * 1975-07-03 1978-02-21 Standard Oil Company (Indiana) Method using lignosulfonates for high-temperature plugging
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
CN101633835A (en) * 2009-08-27 2010-01-27 中国石油化工股份有限公司 Heavy oil thermal recovery fleeing proof agent
CN106634908A (en) * 2016-10-09 2017-05-10 中国石油化工股份有限公司 Heat-resisting interpenetrating polymer network plural gel profile control agent and preparation method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4074757A (en) * 1975-07-03 1978-02-21 Standard Oil Company (Indiana) Method using lignosulfonates for high-temperature plugging
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
CN101633835A (en) * 2009-08-27 2010-01-27 中国石油化工股份有限公司 Heavy oil thermal recovery fleeing proof agent
CN106634908A (en) * 2016-10-09 2017-05-10 中国石油化工股份有限公司 Heat-resisting interpenetrating polymer network plural gel profile control agent and preparation method thereof

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