CN108841366B - High-temperature leakage-proof plugging agent and preparation method and application thereof - Google Patents
High-temperature leakage-proof plugging agent and preparation method and application thereof Download PDFInfo
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- CN108841366B CN108841366B CN201810605631.4A CN201810605631A CN108841366B CN 108841366 B CN108841366 B CN 108841366B CN 201810605631 A CN201810605631 A CN 201810605631A CN 108841366 B CN108841366 B CN 108841366B
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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
- 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
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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
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The invention provides a high-temperature leakage-proof plugging agent and a preparation method and application thereof. The blocking agent comprises, by mass, 100% of ultrafine cement 40-60%, graphite particles 10-15%, silicon powder 10-15%, sodium tannate 1-3%, and the balance of water. The preparation method of the high-temperature leakage-proof plugging agent is simple and convenient, and the raw materials are easy to obtain; the prepared plugging agent has good temperature resistance, high pressure resistance, high breakthrough pressure resistance, good leakage resistance and high plugging capacity strength, and can be applied to the sealing and channeling sealing process technology of the high-temperature and high-pressure leakage well of the oil field to realize the sealing and channeling sealing of the high-temperature and high-pressure leakage serious well.
Description
Technical Field
The invention belongs to the technical field of oilfield well plugging, and relates to a high-temperature leakage-proof plugging agent, and a preparation method and application thereof.
Background
The thick oil is mainly prepared by steam huff and puff and steam drive technology, and in the middle and later periods of exploitation, because of multiple rounds of steam huff and puff and long-time steam drive, formation steam forms fingering and gas channeling between the stratums; the casing of the well is damaged and lost; the cement for cementing outside the casing pipe fails due to long-term high-temperature and high-pressure erosion to form the outside channeling of the casing pipe, so that the injected high-temperature and high-pressure steam can carry natural gas and H in the oil well2S gas is blown out of the ground through the outer pipe channeling channel and the sleeve loss leakage point to generate explosion or cause poisoning to people, if large-area air leakage on the ground is formed, some production wells have to be shut down, even partial blocks have to be shut down, so that not only is the serious harm to personal safety and environmental pollution caused, but also the serious influence is caused to the production of thick oil exploitation, and therefore, the leakage wells have to be subjected to layer sealing, channeling sealing and well sealing measures for comprehensive treatment.
Disclosure of Invention
Aiming at the problems of oil well leakage, oil and gas channeling, difficult plugging and the like at high temperature in the process of thickened oil exploitation in the prior art, the invention aims to provide a high-temperature leakage-proof plugging agent and a preparation method thereof; the blocking agent has the advantages of simple preparation method, easily obtained raw materials, low viscosity, easy stability in a pump cylinder, high temperature resistance and high pressure resistance. The invention also aims to provide the application of the plugging agent in high-temperature loss prevention of the shaft of the oil field, the plugging agent is applied to high-temperature loss prevention of the shaft of the oil field, has good leakage prevention property, high temperature resistance and high pressure resistance, has high breakthrough pressure, and can meet the requirements of high-temperature and high-pressure loss prevention wells.
The purpose of the invention is realized by the following technical scheme:
in one aspect, the invention provides a high temperature leak-proof blocking agent, which comprises the following components in percentage by mass of 100 percent:
in the plugging agent, the superfine cement is preferably grade G oil well cement.
In the plugging agent, the G-grade specific surface area of the superfine cement is preferably more than or equal to 7000cm2/g。
In the plugging agent, G-grade oil well cement is one of main components of the high-temperature leakage well plugging agent, and the G-grade specific surface area is more than or equal to 7000cm2The plugging agent is suitable for grouting of common fine spaces, has good solubility in water, and has the main function of being used as a main plugging factor of a high-temperature leakage well.
In the blocking agent, the graphite particles preferably have a particle size of 0.2 to 10 mm.
In the blocking agent, graphite particles are one of the main components of the high-temperature leakage-proof blocking agent, the graphite particle size is 0.2-10mm, the graphite particles are insoluble in water, and the graphite particles mainly play a role in serving as a main factor of the leakage-proof high-temperature blocking agent in the high-temperature leakage-proof blocking agent.
In the plugging agent, silicon powder is used as one of the filling materials of the high-temperature-resistant leakage-proof plugging agent, and the function of the silicon powder is used for improving the temperature resistance of the plugging agent at high temperature.
In the blocking agent, sodium tannate is used as one of the filling materials of the high-temperature-resistant leakage-proof blocking agent, has good solubility in water, and is used for the delayed coagulation of the blocking agent at high temperature.
The components of the four plugging agents of the superfine cement, the graphite particles, the silicon powder and the sodium tannate are in synergistic action; the superfine cement, the silica powder and the sodium tannate act to strengthen the strength of the plugging agent at high temperature, and the graphite particles are used for square leakage at high temperature; if superfine cement is removed from the high-temperature leakage-proof plugging agent, only silicon powder, sodium tannate and graphite particles can not play a role in plugging capacity at high temperature, and the solidification phenomenon can not occur in the stratum; if the high-temperature plugging agent is removed from graphite particles, the high-temperature plugging agent still has serious stratum leakage no matter how much plugging agent is pumped into the stratum, and subsequent high-temperature well sealing and plugging processes cannot be realized.
In the above-mentioned blocking agent, preferably, the density of the blocking agent is 1.85g/cm3-1.90g/cm3。
On the other hand, the invention also provides a preparation method of the plugging agent, which comprises the following steps:
water is stirred into a vortex shape in advance, superfine cement, silicon powder, sodium tannate and graphite particles are sequentially added, the mixture is stirred at normal temperature and low speed, and the mixture is stirred at high speed after the addition is finished to obtain the plugging agent.
In the above-mentioned production method, the rotation speed of the low-speed stirring is preferably 2500 rpm to 3000 rpm.
In the above preparation method, preferably, the rotation speed of the high-speed stirring is 7000 rpm to 7500 rpm.
In the above preparation method, the high-speed stirring time is preferably 1min to 2 min.
On the other hand, the invention also provides the application of the plugging agent in the sealing layer and channeling sealing process technology of the high-temperature and high-pressure leakage well in the oil field.
In the above application, preferably, the specific steps of the application are as follows:
the blocking agent prepared by pre-stirring is tested to have the density of 1.85g/cm3-1.90g/cm3And the plugging agent is injected into the stratum at one time to complete the plugging of the high-temperature and high-pressure leakage well and the plugging of the channeling sealing process.
In the above application, the high temperature range is preferably 200-300 ℃; the high pressure range is 5MPa-10 MPa.
The preparation method of the high-temperature leakage-proof plugging agent is simple and convenient, and the raw materials are easy to obtain; the prepared plugging agent has good temperature resistance, high pressure resistance, high breakthrough pressure resistance, good leakage resistance and high plugging capacity strength, and can be applied to the sealing and channeling sealing process technology of the high-temperature and high-pressure leakage well of the oil field to realize the sealing and channeling sealing of the high-temperature and high-pressure leakage serious well.
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 high-temperature leakage-proof plugging agent, which comprises the following components in percentage by mass as 100 percent:
the superfine cement is G-grade oil well cement, and the G-grade specific surface area is more than or equal to 7000cm2(ii)/g; the particle size of the graphite particles is 0.2-0.6 mm.
The embodiment also provides a preparation method of the high-temperature leakage-proof plugging agent, which specifically comprises the following steps: the field water is stirred into a vortex shape in advance, superfine cement, silicon powder and sodium tannate are sequentially added, finally graphite particles are added, stirring is carried out at normal temperature and low speed (2500 rpm-3000 rpm) during adding, and stirring is carried out for 1min-2min at high speed (7000 rpm-7500 rpm) after adding is finished, so as to obtain the plugging agent. The density of the plugging agent is 1.89g/cm3。
Example 2
The embodiment provides a high-temperature leakage-proof plugging agent, which comprises the following components in percentage by mass as 100 percent:
g-grade oil well water as superfine cementSpecific surface area of mud, G grade is not less than 7000cm2(ii)/g; the particle size of the graphite particles is 0.2-6 mm.
The embodiment also provides a preparation method of the high-temperature leakage-proof plugging agent, which specifically comprises the following steps: the field water is stirred into a vortex shape in advance, superfine cement, silicon powder and sodium tannate are sequentially added, finally graphite particles are added, stirring is carried out at normal temperature and low speed (2500 rpm-3000 rpm) during adding, and stirring is carried out for 1min-2min at high speed (7000 rpm-7500 rpm) after adding is finished, so as to obtain the plugging agent. The density of the plugging agent is 1.89g/cm3。
Example 3
The embodiment provides a high-temperature leakage-proof plugging agent, which comprises the following components in percentage by mass as 100 percent:
the superfine cement is G-grade oil well cement, and the G-grade specific surface area is more than or equal to 7000cm2(ii)/g; the particle size of the graphite particles is 0.2-6 mm.
The embodiment also provides a preparation method of the high-temperature leakage-proof plugging agent, which specifically comprises the following steps: the field water is stirred into a vortex shape in advance, superfine cement, silicon powder and sodium tannate are sequentially added, finally graphite particles are added, stirring is carried out at normal temperature and low speed (2500 rpm-3000 rpm) during adding, and stirring is carried out for 1min-2min at high speed (7000 rpm-7500 rpm) after adding is finished, so as to obtain the plugging agent. The density of the plugging agent is 1.89g/cm3。
Example 4
The embodiment provides a high-temperature leakage-proof plugging agent, which comprises the following components in percentage by mass as 100 percent:
the superfine cement is G-grade oil well cement, and the G-grade specific surface area is more than or equal to 7000cm2(ii)/g; the particle size of the graphite particles is 0.2-10 mm.
The embodiment also provides a preparation method of the high-temperature leakage-proof plugging agent, which specifically comprises the following steps: will be in situWater is stirred into a vortex shape in advance, superfine cement, silicon powder and sodium tannate are sequentially added, graphite particles are finally added, stirring is carried out at normal temperature and low speed (2500 rpm-3000 rpm) when the graphite particles are added, and stirring is carried out for 1min-2min at high speed (7000 rpm-7500 rpm) after the graphite particles are added, so that the plugging agent is obtained. The density of the plugging agent is 1.89g/cm3。
Solidification test
The high temperature leak-proof plugging agents prepared in the above examples 1 to 4 were subjected to an indoor high temperature phase change simulation experiment, and the curing time was measured, and the experimental results are shown in table 1.
Table 1:
from the experimental data in table 1, it can be seen that: under different mass concentrations, the pumping time of the high-temperature leakage-proof plugging agent in the high-temperature shaft is the upper limit, and the time is shorter than the time that the plugging agent does not flash under the high-temperature condition, so that the pumping time of the safest high-temperature leakage-proof plugging agent can be mastered by changing the proportion of the raw materials of the plugging agent.
High temperature test
Solidifying the blocking agent to prepare a sample test block, putting the sample test block into a high-temperature high-pressure reaction kettle, putting clear water into the reaction kettle to submerge the sample test block, and carrying out a 1d-7d temperature resistance experiment on the sample test block at the temperature of 300-350 ℃ according to the using method of a high-pressure container. After the temperature resistant experiment is finished, the sample test block is taken out, the compressive strength of the sample test block after the temperature resistant experiment is tested, the compressive strength of the sample test block before temperature resistance is compared, and the experimental result is shown in table 2.
Table 2:
from the experimental data in table 2, it can be seen that: by changing the proportion of the raw materials of the plugging agent, the pressure can be controlled to be 7.8-10.2MPa, the pressure of the high-temperature leakage-proof plugging agent is controlled, and the plugging strength requirements of wells with different measures can be met.
Plugging rate and breakthrough pressure
Indoor core simulation experiments were performed on the high temperature leak-proof plugging agents prepared in examples 1 to 4, and the void volume PV and the core permeability K of the core were measured0. And injecting a plugging agent with the pressure of more than 10 PV. The gel is kept for 24 hours at the temperature of 90 ℃. After the setting is finished, measuring the permeability K of the core after plugging at room temperature1And continuously increasing the pressure to be below the rated pressure of the device at 0.1MPa/min, wherein the pressure of the first drop of liquid flowing out of the plugged rock core is the breakthrough pressure. And calculating the plugging rate and the breakthrough pressure gradient according to the following formula.
Eta-plugging rate, expressed as a percentage (%);
K0permeability before core plugging, unit millidarcy (10-3 μm)2)；
K1Permeability after core plugging, unit millidarcy (10-3 μm)2)；
L-core length.
The plugging rate and breakthrough pressure after plugging, and the test results are shown in table 3.
Table 3:
from the experimental data in table 3, it can be seen that: the plugging rate of the plugging agent of the embodiment of the invention can reach 100%, the breakthrough pressure reaches over 75MPa, and the plugging strength requirements of wells with different measures can be met.
Example 5
The embodiment provides an application of the high-temperature leakage-proof plugging agent prepared in the embodiment 3 in the sealing layer and channeling sealing process technology of the high-temperature high-pressure leakage-proof well in the oil field.
The Du 84-50-148 well is a steam injection well, the well depth is 715m, the pen point of a steam injection pipe column is between the upper boundary and the lower boundary of an oil layer, the well bottom temperature is up to 242 ℃, the oil pipe pressure is 5MPa, the casing pipe pressure is 2.5MPa, the well belongs to a hoisting well mouth, the temperature of the whole well bore from 110m to the well bottom fluctuates about 200-250 ℃, and the pressure from the well mouth to the well bottom fluctuates about 5MPa, so the leakage at the well bottom is serious.
The high-temperature leakage-proof plugging agent has a curing experiment of 1.5h indoors at 240 ℃, the high-temperature leakage-proof plugging agent can be safely pumped into a stratum in a shaft of a high-temperature shaft of about 600m, and the pressure of the plugging agent can reach 8.8MPa at 350 ℃. By adopting the formula, the high temperature leakage-proof temperature-increasing device can increase the temperature to 30m in the field3Fully and evenly stirred to prepare the plugging agent with the density of 1.89g/cm3. And (4) observing sleeve pressure change in the extruding and filling process, and reversely extruding clear water to balance the ash extruding pressure when the sleeve pressure rises quickly. After the high-temperature leak-proof plugging agent is injected, the top clean water is corrected to be 2.4m3And lifting the pipe column for 1-2 m, and washing out the excessive high-temperature leakage-proof plugging agent until the backwashing is clear water. Waiting for 24 hours, testing the pressure of the plugging well section by 15MPa, reducing the pressure by less than or equal to 0.5MPa in 30 minutes, and having good plugging effect.
In conclusion, the preparation method of the high-temperature leakage-proof plugging agent is simple and convenient, and raw materials are easy to obtain; the prepared plugging agent has good temperature resistance, high pressure resistance, high breakthrough pressure resistance, good leakage resistance and high plugging capacity strength, and can be applied to the sealing and channeling sealing process technology of the high-temperature and high-pressure leakage well of the oil field to realize the sealing and channeling sealing of the high-temperature and high-pressure leakage serious well.
Claims (8)
1. The high-temperature leakage-proof plugging agent is characterized by comprising the following components in percentage by mass of 100 percent:
and the balance water;
wherein the superfine cement is G-grade oil well cement, and the G-grade specific surface area is more than or equal to 7000cm2/g；
The particle size of the graphite particles is 0.2-10 mm.
2. The plugging agent of claim 1, wherein: the density of the plugging agent is 1.85g/cm3-1.90g/cm3。
3. A process for the preparation of the blocking agent of claim 1 or 2, comprising the steps of:
water is stirred into a vortex shape in advance, superfine cement, silicon powder, sodium tannate and graphite particles are sequentially added, the mixture is stirred at normal temperature and low speed, and the mixture is stirred at high speed after the addition is finished to obtain the plugging agent.
4. The production method according to claim 3, characterized in that:
the rotation speed of low-speed stirring is 2500-3000 r/min;
the rotating speed of the high-speed stirring is 7000 r/min-7500 r/min.
5. The production method according to claim 3, characterized in that: the high-speed stirring time is 1min-2 min.
6. The use of the plugging agent of claim 1 or 2 in the sealing layer and sealing channeling process technology of high-temperature and high-pressure leakage wells in oil fields.
7. The application of claim 6, wherein the application specific steps are:
the blocking agent prepared by pre-stirring is tested to have the density of 1.85g/cm3-1.90g/cm3And the plugging agent is injected into the stratum at one time to complete the plugging of the high-temperature and high-pressure leakage well and the plugging of the channeling sealing process.
8. Use according to claim 7, characterized in that: the high temperature range is 200-300 ℃; the high pressure range is 5MPa-10 MPa.
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| CN111663935B (en) * | 2019-03-08 | 2023-05-26 | 中石化石油工程技术服务有限公司 | Method and system for evaluating annular air tightness of shaft |
| CN111188606B (en) * | 2020-01-14 | 2022-02-22 | 中国石油大学(华东) | Low-temperature expandable graphite for steam injection channeling sealing of heavy oil reservoir and preparation method and application thereof |
| CN112647895A (en) * | 2020-12-28 | 2021-04-13 | 黑龙江弘力通能源技术服务有限公司 | Method for plugging leakage of oil-gas well casing by adopting liquid casing |
| CN113234424B (en) * | 2021-05-20 | 2022-08-19 | 嘉华特种水泥股份有限公司 | Low-density well cementation cement slurry system suitable for medium-high temperature stratum and preparation method thereof |
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