CN110862810B - Cleaning agent for efficient well flushing fluid and preparation method thereof - Google Patents
Cleaning agent for efficient well flushing fluid and preparation method thereof Download PDFInfo
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- CN110862810B CN110862810B CN201911255897.1A CN201911255897A CN110862810B CN 110862810 B CN110862810 B CN 110862810B CN 201911255897 A CN201911255897 A CN 201911255897A CN 110862810 B CN110862810 B CN 110862810B
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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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
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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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
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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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
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Abstract
The invention discloses a cleaning agent for high-efficiency well-flushing liquid and a preparation method thereof, wherein the cleaning agent comprises the following components in percentage by mass: 1 to 15 percent of dispersant, 1 to 50 percent of surfactant, 3 to 34 percent of penetrant, 0.5 to 2 percent of flocculant and the balance of water. The preparation method comprises the following steps: sequentially adding the dispersing agent, the surfactant, the penetrating agent and the flocculating agent into a reaction kettle according to a ratio, adding water according to the ratio under a stirring condition, slowly heating to 50-120 ℃, continuously stirring for 30-60 min, and stopping heating; and cooling while stirring, and cooling to room temperature to obtain the cleaning agent for the high-efficiency well flushing liquid. The invention can efficiently remove impurities on the casing wall, and prevent liquid and equipment used in subsequent operation from being polluted or damaged, thereby influencing the effects of subsequent operations such as well cementation, drifting, well logging, acid fracturing and the like.
Description
Technical Field
The invention relates to the technical field of oilfield chemistry in the technology of improving the recovery ratio of crude oil, in particular to a cleaning agent for high-efficiency well-flushing liquid and a preparation method thereof.
Background
At present, with the continuous development of oil field development, newly-invested development blocks of inclined wells increase, and after drilling is finished, a certain amount of oil sludge remains on the casing wall in a shaft, so that the oil sludge remaining on the casing wall needs to be cleaned for the convenience of normal operation of subsequent operations. Impurities on the oil pipe cannot be stripped from the pipe wall by simple hot washing, so that effective well washing liquid needs to be prepared and pumped into a shaft for circular well washing. The well washing is a process that in the process of well repairing operation, well washing medium is injected by pumping equipment through a shaft or a drill rod and substances (liquid phase, solid phase and gas phase) in the shaft are carried to the ground so as to change the property of the medium in the shaft and meet the operation requirement.
Although the types of the existing well-flushing liquid are various, the well-flushing liquid also has a certain flushing effect on oil-based mud and the like, but has certain limitations, cannot meet the requirements of well cementation quality, not only can affect the perforation, fracturing and oil testing of the next step, but also can affect the accuracy and precision of exploration and logging data, and directly affect the long-term planning development and production of oil fields, so that the development of a safe and effective well-flushing liquid is necessary.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a cleaning agent for a high-efficiency well-flushing liquid and a preparation method thereof, which can efficiently remove impurities on the wall of a casing, prevent the liquid and equipment used in subsequent operation from being polluted or damaged, and influence the effects of subsequent operations such as well cementation, well dredging, well logging, acid fracturing and the like.
The technical scheme of the invention is as follows:
on the one hand, the cleaning agent for the efficient well-flushing liquid comprises the following components in percentage by mass: 1 to 15 percent of dispersant, 1 to 50 percent of surfactant, 3 to 34 percent of penetrant, 0.5 to 2 percent of flocculant and the balance of water.
Preferably, the dispersant is one or a mixture of two of sodium silicate and sodium carbonate, and when the dispersant is a mixture, the mass percent of the sodium silicate is 5-10%, and the mass percent of the sodium carbonate is 1-5%.
Preferably, the surfactant is one or a mixture of more of polyethylene glycol octyl phenyl ether, sodium dodecyl sulfate, NP-10 and SOPE-30, wherein the mass percent of the polyethylene glycol octyl phenyl ether is 1-10%, the mass percent of the sodium dodecyl sulfate is 5-15%, the mass percent of the NP-10 is 3-15%, and the mass percent of the SOPE-30 is 3-10%.
Preferably, the penetrating agent is one or a mixture of more of JFC-2, fatty alcohol-polyoxyethylene ether 9 ether MOA-9 and a rapid penetrating agent T, wherein the JFC-2 accounts for 5-12% by mass, the fatty alcohol-polyoxyethylene ether 9 ether MOA-9 accounts for 3-10% by mass, and the rapid penetrating agent T accounts for 5-12% by mass.
Preferably, the flocculating agent is one or a mixture of two of polyacrylamide and polyaluminium chloride, wherein the mass percent of the polyacrylamide is 0.5-1%, and the mass percent of the polyaluminium chloride is 0.5-1%.
On the other hand, the preparation method of any one of the cleaning agents for the efficient well-flushing liquid comprises the following steps:
sequentially adding the dispersing agent, the surfactant, the penetrating agent and the flocculating agent into a reaction kettle according to a ratio, adding water according to the ratio under a stirring condition, heating to 50-120 ℃, continuously stirring for 30-60 min, and stopping heating;
and cooling while stirring, and cooling to room temperature to obtain the cleaning agent for the high-efficiency well flushing liquid.
Preferably, the temperature increase rate at the time of temperature increase is less than 2 ℃/min.
Preferably, the reaction pressure of the reaction kettle is controlled within the range of-0.05 to 0.20 Mpa.
Compared with the prior art, the invention has the following advantages:
on one hand, the oil sludge slurry has good temperature resistance, and under the conditions of room temperature and high temperature of 60-200 ℃, the oil sludge slurry can be well dispersed, impurities on the casing wall can be efficiently removed, and the effects of subsequent operations such as well cementation, well dredging, well logging, acid fracturing and the like are prevented from being polluted or damaged by liquid and equipment used in the subsequent operations. The invention can also reduce the adsorption capacity of oil pipe colloid, asphalt and paraffin. On the other hand, the invention can also balance the lateral pressure of the stratum, protect the well wall and prevent the stratum from collapsing; when the circulation is stopped, the rock debris and the weighting material are suspended, so that the sedimentation speed of the rock debris is reduced, and the sand setting and drilling sticking are avoided; generates buoyancy to the drilling tool and the casing pipe, and lightens the load of the derrick.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a photograph of the sludge to be cleaned in test 5;
FIG. 2 is a photograph showing the sludge washed at room temperature by the cleaning agent for a well-flushing fluid of the present invention in test 5;
FIG. 3 is a photograph showing the sludge washed at 60 ℃ by the detergent for a well-flushing fluid of the present invention in test 5;
FIG. 4 is a photograph of a comparative cleaner used in run 5 to clean sludge at room temperature;
FIG. 5 is a photograph of the comparative cleaner in test 5 at 87.8 ℃ for cleaning the sludge.
Detailed Description
The invention is further illustrated with reference to the following figures and examples. It should be noted that, in the present application, the embodiments and the technical features of the embodiments may be combined with each other without conflict.
On one hand, the invention provides a cleaning agent for high-efficiency well-flushing liquid, which comprises the following components in percentage by mass: 1 to 15 percent of dispersant, 1 to 50 percent of surfactant, 3 to 34 percent of penetrant, 0.5 to 2 percent of flocculant and the balance of water.
In a specific embodiment, the dispersant is one or a mixture of sodium silicate and sodium carbonate, and when the dispersant is a mixture, the mass percentage of the sodium silicate is 5-10%, and the mass percentage of the sodium carbonate is 1-5%.
In a specific embodiment, the surfactant is one or a mixture of polyethylene glycol octyl phenyl ether, sodium dodecyl sulfate, NP-10 and SOPE-30, wherein the mass percent of the polyethylene glycol octyl phenyl ether is 1-10%, the mass percent of the sodium dodecyl sulfate is 5-15%, the mass percent of the NP-10 is 3-15%, and the mass percent of the SOPE-30 is 3-10%.
In a specific embodiment, the penetrating agent is one or a mixture of more of JFC-2, fatty alcohol-polyoxyethylene ether 9 ether MOA-9 and a rapid penetrating agent T, wherein the JFC-2 accounts for 5-12% by mass, the fatty alcohol-polyoxyethylene ether 9 ether MOA-9 accounts for 3-10% by mass, and the rapid penetrating agent T accounts for 5-12% by mass.
In a specific embodiment, the flocculant is one or a mixture of two of polyacrylamide and polyaluminium chloride, wherein the mass percent of the polyacrylamide is 0.5-1%, and the mass percent of the polyaluminium chloride is 0.5-1%.
On the other hand, the invention also provides a preparation method of any one of the cleaning agents for the high-efficiency well-flushing liquid, which comprises the following steps:
sequentially adding the dispersing agent, the surfactant, the penetrating agent and the flocculating agent into a reaction kettle according to a ratio, adding water according to the ratio under a stirring condition, heating to 50-120 ℃, continuously stirring for 30-60 min, and stopping heating;
and cooling while stirring, and cooling to room temperature to obtain the cleaning agent for the high-efficiency well flushing liquid.
In a specific embodiment, the temperature rise rate during temperature rise is less than 2 ℃/min, and the reaction pressure of the reaction kettle is controlled within the range of-0.05 to 0.20 Mpa.
Example 1
Sequentially adding 2% of sodium carbonate, 6% of polyethylene glycol octyl phenyl ether, 5% of surfactant NP-10, 10% of penetrating agent JFC-2, 5% of rapid penetrating agent T and 0.5% of polyacrylamide into a reaction kettle with stirring, heating and cooling functions according to a proportion, adding 71.5% of water under continuous stirring, slowly heating to 50-120 ℃, continuously stirring for 30min, and stopping heating. Cooling while stirring, and cooling to room temperature to obtain the high-efficiency cleaning agent for the well-flushing liquid.
Example 2
Sequentially adding 5% of sodium carbonate, 10% of sodium dodecyl sulfate, 10% of penetrating agent JFC-2 and 0.6% of polyacrylamide into a reaction kettle with stirring, heating and cooling functions according to a proportion, adding 74.4% of water under continuous stirring, slowly heating to 50-120 ℃, continuing stirring for 30min, and stopping heating. Cooling while stirring, and cooling to room temperature to obtain the high-efficiency cleaning agent for the well-flushing liquid.
Example 3
Sequentially adding 6% of sodium silicate, 10% of sodium dodecyl sulfate, 3% of NP-10, 10% of fatty alcohol-polyoxyethylene ether 9 MOA-9 and 0.6% of polyaluminium chloride into a reaction kettle with stirring, heating and cooling functions according to a proportion, adding 70.4% of water under continuous stirring, slowly heating to 50-120 ℃, continuously stirring for 30min, and stopping heating. Cooling while stirring, and cooling to room temperature to obtain the high-efficiency cleaning agent for the well-flushing liquid.
Example 4
Sequentially adding 6% of sodium silicate, 5% of polyethylene glycol octyl phenyl ether, 5% of sodium dodecyl sulfate, 10% of penetrating agent JFC-2 and 0.5% of polyaluminium chloride into a reaction kettle with stirring, heating and cooling functions according to a proportion, adding 73.5% of water under continuous stirring, slowly heating to 50-120 ℃, continuously stirring for 30min, and stopping heating. Cooling while stirring, and cooling to room temperature to obtain the high-efficiency cleaning agent for the well-flushing liquid.
Example 5
Sequentially adding 8% of sodium silicate, 10% of sodium dodecyl sulfate, 5% of SOPE-30, 5% of JFC-2, 5% of fatty alcohol-polyoxyethylene ether 9-MOA-9 and 0.8% of polyaluminium chloride into a reaction kettle with stirring, heating and cooling functions according to a proportion, adding 66.2% of water under continuous stirring, slowly heating to 50-120 ℃, continuously stirring for 30min, and stopping heating. Cooling while stirring, and cooling to room temperature to obtain the high-efficiency cleaning agent for the well-flushing liquid.
After the cleaning agent for the well-flushing fluid prepared in the embodiment 1-5 is prepared into an aqueous solution with a sample concentration of 1%, the following performance evaluation test is carried out, and the cleaning agent can be prepared into an aqueous solution with a concentration of 0.5% -5% when used in an actual construction site, and the specific dosage can be adjusted according to actual conditions.
Test 1
The anti-swelling rate of the cleaning agent for high-efficiency well-flushing liquid obtained in examples 1 to 5 of the present invention was measured according to the anti-swelling rate measuring method of the industrial standard SY/T5971-2016, and the measurement results are shown in Table 1:
TABLE 1 measurement results of anti-swelling ratio
| Cleaning agent | Percent swelling prevention (%) |
| Example 1 | 84 |
| Example 2 | 81 |
| Example 3 | 86 |
| Example 4 | 82 |
| Example 5 | 88 |
As can be seen from the data in Table 1, the cleaning agent for well-flushing fluid prepared according to examples 1-5 of the present invention has a swelling prevention rate of 81% or more, which indicates that the cleaning agent for well-flushing fluid of the present invention can effectively prevent the hydration swelling and dispersion transfer of the water-sensitive clay in the well wall or between the wells, wherein the swelling prevention rates of examples 3 and 5 are 86% or more, which is higher than the swelling prevention rates of examples 1, 2 and 4.
Test 2
The oil-water interfacial tension of the cleaning agent for the high-efficiency well-flushing liquid obtained in the examples 1 to 5 of the invention is measured according to the surface and interfacial tension measuring method in the industrial standard SY/T5370-2018, and the measuring result is shown in Table 2:
TABLE 2 measurement results of oil-water interfacial tension
| Cleaning agent | Oil-water interfacial tension mN/m |
| Example 1 | 2.3×10-4 |
| Example 2 | 3.8×10-4 |
| Example 3 | 1.5×10-4 |
| Example 4 | 3.0×10-4 |
| Example 5 | 1.2×10-4 |
| Is free of | 3.0×10-3 |
As can be seen from the data of table 2, the cleaning agents for well-flushing fluids prepared according to examples 1, 3 and 5 have lower interfacial tension than those prepared according to examples 2 and 4, and the surfactants used in the examples of the present invention reduce the interfacial tension of water due to the presence of the surfactants which change the interfacial tension of water, thereby increasing the emulsification degree of crude oil, facilitating cleaning, and reducing water lock damage.
Test 3
The cleaning agent for high-efficiency well-flushing fluid obtained in examples 1-5 of the present invention was measured for corrosion resistance according to the water corrosion test method in the industry standard SY/T0026-1999-static exposure method in the inspection standard of petroleum and oilfield chemicals, and the measurement results are shown in Table 3:
TABLE 3 measurement results of Corrosion prevention
| Cleaning agent | Corrosion inhibition (%) |
| Example 1 | 87 |
| Example 2 | 85 |
| Example 3 | 90 |
| Example 4 | 86 |
| Example 5 | 92 |
As can be seen from the data in Table 3, the corrosion prevention rates of the cleaning agents for well-flushing fluids prepared according to examples 1-5 of the present invention were all above 85%, indicating that the cleaning agents for well-flushing fluids according to the present invention can effectively prevent corrosion of downhole metal equipment.
Test 4
The cleaning agent for the well-flushing fluid disclosed by the embodiments 1-5 of the invention is mixed with formation water in different fields at room temperature and 60 ℃, and the mixed solution is clear and transparent and almost has no precipitate, which shows that the cleaning agent for the well-flushing fluid disclosed by the invention has good compatibility with the formation water.
Test 5
As shown in fig. 1 to 5, the cleaning agent for a well-flushing fluid prepared in example 3 and DISPLUS39L cleaning agent of basf corporation, which is commercially available in a large amount, were used as comparative cleaning agents, and the same weight of oil sludge collected at the same place was subjected to cleaning treatment under room temperature and high temperature conditions, wherein the comparative cleaning agents were tested at a concentration of 2gpb used in the product specification of the product.
The flushing fluid prepared by using the cleaning agent for the flushing fluid has good dispersion effect, the oil sludge cleaning effect is obvious under the condition of room temperature, the cleaning effect is still obvious after the flushing fluid is heated to 60 ℃, 100 ℃ and 200 ℃, gravel is separated out from the bottom layer in the cleaning process, and the upper layer is an oil-water mixing layer. The invention has good temperature resistance, and can efficiently remove oil sludge on the casing wall at the high temperature of 60-200 ℃; in addition, the oil sludge on the casing wall can be efficiently removed under the condition of room temperature, the use temperature range is wide, the oil sludge can be used in different stratum depths at different stages, the application range of the invention is enlarged, and the practical value of the invention is improved.
The well-flushing liquid prepared by using the contrast cleaning agent DISPLUS39L has a dispersion effect which is poorer than that of the well-flushing liquid prepared by using the invention, oil cannot be cleaned from oil sludge under the condition of room temperature, the liquid phase is transparent, no obvious cleaning effect exists after the oil sludge is heated to 60 ℃, no obvious cleaning effect exists when the dosage is increased by 50%, and no obvious cleaning effect exists when the oil sludge is heated to 87.8 ℃ in a product specification. The reason for this analysis is that the comparative cleaning agent having a better cleaning effect in the product specification had a poor cleaning effect in this test and was far inferior to the cleaning effect of the cleaning agent of the present invention, because the sludge tested in the product specification of the comparative product was 12ppg of oilfield diesel-based mud, which was much less than the weight of the sludge used in this test.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The cleaning agent for the high-efficiency well-flushing liquid is characterized by comprising the following components in percentage by mass: 1-15% of dispersing agent, 1-50% of surfactant, 3-34% of penetrating agent, 0.5-2% of flocculating agent and the balance of water;
the dispersant is one or a mixture of sodium silicate and sodium carbonate;
the surfactant is one or a mixture of polyethylene glycol octyl phenyl ether, sodium dodecyl sulfate, NP-10 and SOPE-30;
the penetrating agent is one or a mixture of more of JFC-2, MOA-9 and a rapid penetrating agent T;
the flocculant is one or a mixture of two of polyacrylamide and polyaluminium chloride.
2. The cleaning agent for the efficient well-flushing fluid as claimed in claim 1, wherein the mass percent of the sodium silicate is 5% -10%, and the mass percent of the sodium carbonate is 1% -5%.
3. The cleaning agent for the high-efficiency well-flushing liquid as claimed in claim 1, wherein the mass percent of the polyethylene glycol octyl phenyl ether is 1% -10%, the mass percent of the sodium dodecyl sulfate is 5% -15%, the mass percent of the NP-10 is 3% -15%, and the mass percent of the SOPE-30 is 3% -10%.
4. The cleaning agent for the efficient well-flushing fluid as claimed in claim 1, wherein the JFC-2 is 5-12% by mass, the MOA-9 is 3-10% by mass, and the rapid penetrating agent T is 5-12% by mass.
5. The cleaning agent for the efficient well-flushing fluid as claimed in claim 1, wherein the mass percent of the polyacrylamide is 0.5% -1%, and the mass percent of the polyaluminium chloride is 0.5% -1%.
6. A preparation method of the cleaning agent for the high-efficiency well-flushing liquid as claimed in any one of claims 1 to 5, characterized by comprising the following steps:
sequentially adding the dispersing agent, the surfactant, the penetrating agent and the flocculating agent into a reaction kettle according to a ratio, adding water according to the ratio under a stirring condition, heating to 50-120 ℃, continuously stirring for 30-60 min, and stopping heating;
and cooling while stirring, and cooling to room temperature to obtain the cleaning agent for the high-efficiency well flushing liquid.
7. The preparation method of the cleaning agent for the high-efficiency well-flushing liquid as claimed in claim 6, wherein the temperature rise rate is less than 2 ℃/min.
8. The preparation method of the cleaning agent for the high-efficiency well-flushing liquid as claimed in claim 6, wherein the reaction pressure of the reaction kettle is controlled within the range of-0.05 to 0.20 MPa.
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| ES2389776T3 (en) * | 2005-05-31 | 2012-10-31 | Rhodia, Inc. | Compositions that have HASE rheological modifiers |
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