CN111100617B - Mineralization-sensitive shunt temporary plugging agent and preparation method and application thereof - Google Patents
Mineralization-sensitive shunt temporary plugging agent and preparation method and application thereof Download PDFInfo
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- CN111100617B CN111100617B CN201911154095.1A CN201911154095A CN111100617B CN 111100617 B CN111100617 B CN 111100617B CN 201911154095 A CN201911154095 A CN 201911154095A CN 111100617 B CN111100617 B CN 111100617B
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- 230000033558 biomineral tissue development Effects 0.000 title claims abstract description 63
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 118
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 96
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 93
- 239000002253 acid Substances 0.000 claims abstract description 71
- 238000002347 injection Methods 0.000 claims abstract description 41
- 239000007924 injection Substances 0.000 claims abstract description 41
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims abstract description 33
- 150000001336 alkenes Chemical class 0.000 claims abstract description 33
- 238000006243 chemical reaction Methods 0.000 claims abstract description 33
- 230000020477 pH reduction Effects 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 26
- 229940067741 sodium octyl sulfate Drugs 0.000 claims abstract description 26
- WFRKJMRGXGWHBM-UHFFFAOYSA-M sodium;octyl sulfate Chemical compound [Na+].CCCCCCCCOS([O-])(=O)=O WFRKJMRGXGWHBM-UHFFFAOYSA-M 0.000 claims abstract description 26
- 230000008569 process Effects 0.000 claims abstract description 15
- XZTJQQLJJCXOLP-UHFFFAOYSA-M sodium;decyl sulfate Chemical compound [Na+].CCCCCCCCCCOS([O-])(=O)=O XZTJQQLJJCXOLP-UHFFFAOYSA-M 0.000 claims abstract description 15
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 16
- 239000000243 solution Substances 0.000 claims description 13
- 239000011259 mixed solution Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 8
- YLIMHFXLIKETBC-UHFFFAOYSA-N OS(O)(=O)=O.CCCCCCCC[Na] Chemical compound OS(O)(=O)=O.CCCCCCCC[Na] YLIMHFXLIKETBC-UHFFFAOYSA-N 0.000 claims description 7
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 32
- 239000000693 micelle Substances 0.000 abstract description 24
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 abstract description 15
- 229910001424 calcium ion Inorganic materials 0.000 abstract description 15
- 238000010276 construction Methods 0.000 abstract description 10
- 230000009466 transformation Effects 0.000 abstract description 7
- 239000002994 raw material Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 24
- 238000012360 testing method Methods 0.000 description 21
- 230000006872 improvement Effects 0.000 description 8
- 239000011435 rock Substances 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 7
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 239000011780 sodium chloride Substances 0.000 description 4
- 230000009194 climbing Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 150000004965 peroxy acids Chemical class 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000002332 oil field water Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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- 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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- 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
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Abstract
The invention belongs to the technical field of reservoir diversion acidification construction, and particularly relates to a mineralization-sensitive diversion temporary plugging agent, and a preparation method and application thereof. The mineralization-sensitive shunt temporary plugging agent consists of the following raw materials: 20.0 to 25.0 percent of alkene sulfonic acid, 10.0 to 20.0 percent of sodium octyl sulfate, 3.0 to 5.0 percent of sodium decyl sulfate, 20.0 to 25.0 percent of methanol and the balance of water. The salinity sensitive shunt temporary plugging agent is used in a reservoir shunt acidification construction process, and in the acidification process, when the concentration of calcium ions generated in the reaction process of acid liquor and a stratum is increased to more than 2%, a micelle of 5-200 microns is formed, so that a stratum hypertonic layer can be plugged, the acid liquor is promoted to be diverted to a hypotonic layer for transformation, and a water absorption profile is improved; after acidification and water injection are resumed, the formed micelle can be quickly dissolved in water, and finally the purposes of reducing pressure and increasing yield are achieved.
Description
Technical Field
The invention belongs to the technical field of reservoir diversion acidification construction, and particularly relates to a mineralization-sensitive diversion temporary plugging agent, and a preparation method and application thereof.
Background
In the process of oilfield water injection development, along with development, the water injection profile can generate the phenomenon of uneven injection profile due to factors such as vertical heterogeneity of a reservoir and the like, at the moment, injected water can suddenly enter along a hypertonic layer, so that a medium-low permeable layer is not affected or is difficult to be affected by the injected water, and the volume sweep coefficient of the injected water is reduced. The injection pressure of the wellhead of a partial injection well even reaches 35MPa, and the situation that partial layer system is under-injected still occurs. The conventional flow-dividing acidification technology is characterized in that a temporary plugging agent is injected in a slug mode in the acidification process, and then acid liquor is injected to promote the acid liquor to enter a low-permeability layer for profile adjustment, so that the construction process is complicated, and the flow-dividing effect is poor.
Disclosure of Invention
The invention provides a mineralization-sensitive shunt temporary plugging agent, a preparation method and application thereof, and aims to provide a shunt temporary plugging agent which can promote acid liquor to turn and improve the improvement rate of a section, so that a better shunt effect is generated, and a preparation method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
a mineralization-sensitive shunt temporary plugging agent, which comprises alkene sulfonic acid, sodium octyl sulfate, sodium dodecyl sulfate, methanol and water; wherein the mass percentages of the components are respectively as follows: 20.0 to 25.0 percent of alkene sulfonic acid, 10.0 to 20.0 percent of sodium octyl sulfate, 3.0 to 5.0 percent of sodium decyl sulfate, 20.0 to 25.0 percent of methanol and the balance of water.
The mass percentages of the alkene sulfonic acid, the octyl sodium sulfate, the decyl sodium sulfate, the methanol and the water are respectively as follows: 20.0% of alkene sulfonic acid, 10.0% of sodium octyl sulfate, 3.0% of sodium dodecyl sulfate, 20.0% of methanol and the balance of water.
The mass percentages of the alkene sulfonic acid, the octyl sodium sulfate, the decyl sodium sulfate, the methanol and the water are respectively as follows: olefin sulfonic acid 25.0%, sodium octyl sulfate 20.0%, sodium decyl sulfate 5.0%, methanol 25.0%, and the balance of water.
A preparation method of a mineralization-sensitive shunt temporary plugging agent comprises the following steps:
the method comprises the following steps: heating reaction vessel
Heating the reaction vessel to 60-70 ℃;
step two: adding olefin sulfonic acid and sodium octyl sulfate
After the first step is finished, adding alkene sulfonic acid and sodium octyl sulfate in the formula amount into a reaction vessel, adding half of water in the formula amount while stirring, and stirring until the alkene sulfonic acid and the sodium octyl sulfate are fully dissolved;
step three: adding sodium dodecyl sulfate
After the second step is finished, adding the sodium dodecyl sulfate with the formula amount into the mixed liquid prepared in the second step, adding the rest water, and stirring until the sodium dodecyl sulfate is fully dissolved;
step four: adding methanol solution
After the third step is finished, adding the methanol solution with the formula amount into the mixed solution, and continuously stirring for 15-20 minutes;
step five: temperature reduction
And D, cooling the mixed solution prepared in the step four to room temperature to obtain the mineralization-degree-sensitive shunt temporary plugging agent.
The reaction vessel adopts a reaction kettle.
The temperature of the heated reaction vessel in the first step is heated to 65 ℃.
In the fourth step, the methanol solution is added into the mixed solution for continuous stirring for 18 minutes.
The application of the mineralization-sensitive shunt temporary plugging agent applies the prepared mineralization-sensitive shunt temporary plugging agent to the shunt acidification process of a water injection well.
The application method is that the mineralization-sensitive shunt temporary plugging agent is directly added into the acid liquor, and the adding proportion is 1.5-3.0% of the volume of the injected acid.
The injection proportion of the mineralization-sensitive shunt temporary plugging agent is 2.0 percent of the volume of the injected acid.
Has the advantages that: the mineralization-sensitive shunt temporary plugging agent is an additive for shunt acidification, after acid liquor is added into the mineralization-sensitive shunt temporary plugging agent, when the concentration of calcium ions generated in the reaction process of the acid liquor and a stratum is increased to more than 2%, a micelle of 5-200 micrometers is formed, a stratum hypertonic layer can be plugged, the acid liquor is enabled to be diverted to a hypotonic layer for transformation, and a water absorption profile is improved; after acidification and water injection are resumed, the formed micelle can be quickly dissolved in water, and finally the purposes of reducing pressure and increasing yield are achieved. When the flow divider is used for a flow dividing acidification measure of a water injection well, the flow divider is directly added into acid liquor, and the adding proportion is 1.5-3.0% of the volume of the injected acid. When the mineralization-sensitive shunt temporary plugging agent is used for a shunt acidification measure of a water injection well, micelles with different particle sizes can be effectively formed, so that acid liquor diversion is promoted, and the improvement rate of a section is over 25.0%.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments 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 it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of the test effect of the water absorption profile of the present invention;
FIG. 2 is a schematic diagram of the test effect of a water absorption profile of a conventional shunt temporary plugging agent;
FIG. 3 is a schematic diagram of the experiment results of the diverting and acidizing effect of the formation core diverting agent of the Y8 block in the embodiment of the invention;
FIG. 4 is a schematic diagram of the results of a split acidizing effect test of a Y10 block formation core flow diversion agent in an embodiment of the invention.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, preferred embodiments of the present invention are described in detail below.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
a mineralization-sensitive shunt temporary plugging agent, which comprises alkene sulfonic acid, sodium octyl sulfate, sodium dodecyl sulfate, methanol and water; wherein the mass percentages of the components are respectively as follows: 20.0 to 25.0 percent of alkene sulfonic acid, 10.0 to 20.0 percent of sodium octyl sulfate, 3.0 to 5.0 percent of sodium decyl sulfate, 20.0 to 25.0 percent of methanol and the balance of water.
In practical use, the mass percent of the alkene sulfonic acid is 20.0% -25.0%, so that when the concentration of calcium ions generated in the reaction process of acid liquor and a stratum is increased to more than 2.0%, the alkene sulfonic acid and the calcium ions can form 5-50 microns of micelle, bridging ions are formed in a seepage roar, and a bridging effect is achieved. The mass percentage of the sodium octyl sulfate is 10.0-20.0%, so that when the concentration of calcium ions generated in the reaction process of acid liquor and stratum is increased to more than 3%, the sodium octyl sulfate, calcium ions and magnesium ions can form 50-100 micron micelles, and the temporary plugging effect can be realized in the main seepage throat. The mass percent of the sodium dodecyl sulfate is 3.0-5.0%, so that when the concentration of calcium ions generated in the reaction process of the acid liquor and the stratum is increased to more than 4%, the sodium dodecyl sulfate, calcium ions and magnesium ions can form bridging particles of 100-200 microns and filter cakes can be formed around the holes. The mass percentage of the methanol is 20.0-25.0%, the solubility of the sodium dodecyl sulfate, the sodium octyl sulfate and the alkene sulfonic acid in the product is improved, and the condensation point and the viscosity of the temporary plugging agent are reduced.
In actual use, after the mineralization-sensitive shunt temporary plugging agent is added into acid liquor, when the concentration of calcium ions generated in the reaction process of the acid liquor and a stratum is increased to more than 2%, a micelle of 5-200 microns can be formed, a high-permeability layer of the stratum can be plugged, the acid liquor is enabled to be diverted to a low-permeability layer for transformation, and a water absorption profile is improved; after acidification and water injection are resumed, the formed micelle can be quickly dissolved in water, and finally the purposes of reducing pressure and increasing yield are achieved. When the flow divider is used for a flow dividing acidification measure of a water injection well, the flow divider is directly added into acid liquor, and the adding proportion is 1.5-3.0% of the volume of the injected acid. When the mineralization-sensitive shunt temporary plugging agent is used for a shunt acidification measure of a water injection well, micelles with different particle sizes can be effectively formed, so that acid liquor diversion is promoted, and the improvement rate of a section is over 25.0%.
A Y8 block stratum rock core is selected, 2% of mineralization-sensitive shunt temporary plugging agent is added into the earth acid, the shunt acidification effect of the shunt agent is observed through a rock core flowing experiment, and the experiment result is shown in figure 3.
The pressure response curve of the experiment of acid injection of the core in the Y8 block shows that after the core is injected with the diverting agent, the pressure fluctuates greatly and continuously and obviously rises along with the continuous injection of the diverting agent and the acid liquor, which indicates that the diverting agent has the temporary plugging function; under the action of the diverting agent, acid liquor invades the low-permeability part of the rock core under high displacement pressure and reacts with the rock at the low-permeability part. Saline is injected after peracid, the displacement pressure is rapidly reduced, and the flow dividing agent with the plugging effect is completely dissolved by the saline.
In 3 months in 2019, the acidity-sensitive shunt temporary plugging agent is subjected to field tests in a water injection well Y8-23 of a Y8 block of an oil extraction X plant, and the utilization degree is increased from 47.7 percent to 64.5 percent. The section utilization is increased, and the single well is increased by 2.6 m; the water absorption form becomes good, and the water absorption form is changed from weak top to strong bottom into uniform water absorption. The test effect of the water absorption profile of the conventional shunt temporary plugging agent is shown in figure 1, and the test effect of the water absorption profile of the invention is shown in figure 2. Table 1 is a table of test effect data of water absorption profile of conventional shunt temporary plugging agent, and table 2 is a table of test effect data of water absorption profile of the present invention:
TABLE 1
TABLE 2
Example two:
a mineralization-sensitive shunt temporary plugging agent is different from the first embodiment in that: the mass percentages of the alkene sulfonic acid, the octyl sodium sulfate, the decyl sodium sulfate, the methanol and the water are respectively as follows: 20.0% of alkene sulfonic acid, 10.0% of sodium octyl sulfate, 3.0% of sodium dodecyl sulfate, 20.0% of methanol and the balance of water.
The mineralization-sensitive shunt temporary plugging agent prepared according to the component proportion is firstly subjected to field test in a certain oil field. The test well is a water well, and the water absorption section shows that the upper layer absorbs 82% of water and the lower layer absorbs 18% of water. In order to further adjust the water absorption profile and improve the water driving degree, a mineralization degree control profile adjusting technology test is developed.
The mineralization-sensitive shunt temporary plugging agent is added into acid liquor, and the adding concentration is 1.5% of the volume of the injected acid liquor. In the construction process, after the water injection pressure is obviously reduced, climbing with a certain amplitude is generated, and the pressure is gradually reduced after the reaction is continued. The calcium ions generated by the diverting agent in the process of reacting the acid liquor and the stratum form 5-200 micron micelles when the concentration is continuously increased to more than 2 percent, the stratum hypertonic layer is blocked, the acid liquor is diverted to the hypotonic layer for modification, and the water absorption profile is improved; after acidification and water injection are resumed, the formed micelle can be quickly dissolved in water, and finally the purposes of reducing pressure and increasing yield are achieved. After construction, normal water injection is carried out, a water absorption section is tested after 15 days, and section test results show that the lower layer absorbs 48% of water and the upper layer absorbs 52% of water, the section is obviously improved, and the diversion and steering effect is obvious.
Selecting a Y10 block stratum rock core, adding 2% of mineralization-sensitive shunt temporary plugging agent into the earth acid, and observing the shunt acidification effect of the shunt agent through a rock core flowing experiment, wherein the experiment result is shown in figure 4.
The pressure response curve of the experiment of acid injection of the core in the Y10 block shows that after the core is injected with the diverting agent, the pressure fluctuates greatly and continuously and obviously rises along with the continuous injection of the diverting agent and the acid liquor, which indicates that the diverting agent has the temporary plugging function; under the action of the diverting agent, acid liquor invades the low-permeability part of the rock core under high displacement pressure and reacts with the rock at the low-permeability part. Saline is injected after peracid, the displacement pressure is rapidly reduced, and the flow dividing agent with the plugging effect is completely dissolved by the saline.
In 3 months in 2019, the acidity-sensitive shunt temporary plugging agent is subjected to field tests in a water injection well Y10-47 in a Y8 block of an oil extraction X plant, and the utilization degree is increased from 35.3 percent to 82.1 percent. The section utilization is increased, and the single well is increased by 2.6 m; the water absorption form becomes good, and the water absorption form is changed from weak top to strong bottom into uniform water absorption.
Example three:
a mineralization-sensitive shunt temporary plugging agent is different from the first embodiment in that: the mass percentages of the alkene sulfonic acid, the octyl sodium sulfate, the decyl sodium sulfate, the methanol and the water are respectively as follows: olefin sulfonic acid 25.0%, sodium octyl sulfate 20.0%, sodium decyl sulfate 5.0%, methanol 25.0%, and the balance of water.
The mineralization-sensitive shunt temporary plugging agent prepared according to the component proportion is firstly subjected to field test in a certain oil field. The test well is a water well, and the water absorption section shows that the upper layer absorbs 93 percent of water and the lower layer absorbs 7 percent of water. In order to further adjust the water absorption profile and improve the water driving degree, a mineralization degree control profile adjusting technology test is developed.
The acid control flow divider is added into the acid liquor, and the adding concentration is 3.0 percent of the volume of the injected acid liquor. In the construction process, after the water injection pressure is obviously reduced, climbing with a certain amplitude is generated, and the pressure is gradually reduced after the reaction is continued. The calcium ions generated by the diverting agent in the process of reacting the acid liquor and the stratum form a micelle of 20-200 microns along with the continuous increase of the concentration to more than 2 percent, the stratum hypertonic layer is blocked, the acid liquor is led to be diverted to the hypotonic layer for modification, and the water absorption profile is improved; after acidification and water injection are resumed, the formed micelle can be quickly dissolved in water, and finally the purposes of reducing pressure and increasing yield are achieved. After the construction is finished, normal water injection is carried out, a water absorption section is tested after 15 days, and section test results show that the water absorption of the lower layer reaches 39%, the water absorption of the upper layer reaches 61%, the section is obviously improved, and the diversion and steering effect is obvious.
Example four:
a mineralization-sensitive shunt temporary plugging agent is different from the first embodiment in that: the mass percentages of the alkene sulfonic acid, the octyl sodium sulfate, the decyl sodium sulfate, the methanol and the water are respectively as follows: 20.0% of alkene sulfonic acid, 15.0% of sodium octyl sulfate, 5.0% of sodium dodecyl sulfate, 23.0% of methanol and the balance of water.
The mineralization-sensitive shunt temporary plugging agent prepared according to the component proportion is firstly subjected to field test in a certain oil field. The test well is a water well, and the water absorption section shows that the upper layer absorbs 90% of water and the lower layer absorbs 7.2% of water. In order to further adjust the water absorption profile and improve the water driving degree, a mineralization degree control profile adjusting technology test is developed.
The acid control flow divider is added into the acid liquor, and the adding concentration is 2.0 percent of the volume of the injected acid liquor. In the construction process, after the water injection pressure is obviously reduced, climbing is generated, and the pressure is gradually reduced after the reaction is continued. The calcium ions generated by the diverting agent in the process of reacting the acid liquor and the stratum form 10-190 micron micelles with the concentration continuously rising to more than 2 percent, so that a high permeability layer of the stratum is blocked, the acid liquor is diverted to a low permeability layer for transformation, and the water absorption profile is improved; after acidification and water injection are resumed, the formed micelle can be quickly dissolved in water, and finally the purposes of reducing pressure and increasing yield are achieved. After construction, normal water injection is carried out, a water absorption section is tested after 14 days, and section test results show that the lower layer absorbs water to 36 percent, the upper layer absorbs water to 60 percent, the section is obviously improved, and the diversion and steering effect is obvious.
Example five:
the preparation method of the mineralization-sensitive shunt temporary plugging agent adopting the formula in any one of the first embodiment to the fourth embodiment comprises the following steps:
the method comprises the following steps: heating reaction vessel
Heating the reaction vessel to 60-70 ℃;
step two: adding olefin sulfonic acid and sodium octyl sulfate
After the first step is finished, adding alkene sulfonic acid and sodium octyl sulfate in the formula amount into a reaction vessel, adding half of water in the formula amount while stirring, and stirring until the alkene sulfonic acid and the sodium octyl sulfate are fully dissolved;
step three: adding sodium dodecyl sulfate
After the second step is finished, adding the sodium dodecyl sulfate with the formula amount into the mixed liquid prepared in the second step, adding the rest water, and stirring until the sodium dodecyl sulfate is fully dissolved;
step four: adding methanol solution
After the third step is finished, adding the methanol solution with the formula amount into the mixed solution, and continuously stirring for 15-20 minutes;
step five: temperature reduction
And D, cooling the mixed solution prepared in the step four to room temperature to obtain the mineralization-degree-sensitive shunt temporary plugging agent.
In practical use, the mineralization-sensitive shunt temporary plugging agent prepared by the method has the advantages of obviously improved profile and obvious shunt steering effect, thereby generating better shunt effect.
Example six:
a preparation method of a mineralization-sensitive shunt temporary plugging agent is different from the fifth embodiment in that: the reaction vessel adopts a reaction kettle.
Preferably, the temperature at which the heated reaction vessel is heated in step one is heated to 65 ℃.
Preferably, in the fourth step, the time for stirring is 18 minutes after the addition of the methanol solution to the mixed solution is continued.
In practical use, the reaction vessel adopts the technical scheme of a reaction kettle, so that the preparation of the invention is more convenient and the preparation cost is lower. The heating temperature of the heating reaction container in the step one is 65 ℃, and the continuous stirring time after the methanol solution is added into the mixed solution continuously in the step four is adopted as the technical scheme of 18 minutes, so that the preparation process is easier to control, and the prepared mineralization-sensitive shunt temporary plugging agent can achieve better application effect.
Example seven:
the application of the mineralization-sensitive shunt temporary plugging agent applies the prepared mineralization-sensitive shunt temporary plugging agent to the shunt acidification process of a water injection well.
Preferably, the application method is that the mineralization-sensitive shunt temporary plugging agent is directly added into the acid liquor, and the adding proportion is 1.5-3.0% of the volume of the injected acid.
Preferably, the mineralization-sensitive shunt temporary plugging agent is injected in a proportion of 2.0% of the volume of the injected acid.
When the diversion temporary plugging agent is actually used, the mineralization-sensitive diversion temporary plugging agent is used as an additive for diversion acidification, after acid liquor is added into the diversion agent, when the concentration of calcium ions generated in the reaction process of the acid liquor and a stratum is increased to more than 2%, a micelle of 5-200 micrometers is formed, a stratum hypertonic layer can be plugged, the acid liquor is enabled to be diverted to a hypotonic layer for transformation, and a water absorption profile is improved; after acidification and water injection are resumed, the formed micelle can be quickly dissolved in water, and finally the purposes of reducing pressure and increasing yield are achieved. When the flow divider is used for a flow dividing acidification measure of a water injection well, the flow divider is directly added into acid liquor, and the adding proportion is 1.5-3.0% of the volume of the injected acid. When the flow divider is used for a flow dividing acidification measure of a water injection well, micelles with different particle sizes can be effectively formed, so that acid liquor is promoted to turn, and the improvement rate of a section is over 25 percent. When the mineralization-sensitive shunt temporary plugging agent is injected into the water, the effect is better when the injection proportion is 2.0 percent of the volume of the injected acid, and the improvement rate of the profile is up to 30 percent.
Example eight:
the application of the mineralization-sensitive shunt temporary plugging agent applies the prepared mineralization-sensitive shunt temporary plugging agent to the shunt acidification process of a water injection well.
The mineralization-sensitive shunt temporary plugging agent is directly added into the acid liquor, and the adding proportion is 1.5 percent of the volume of the injected acid.
When the diversion temporary plugging agent is actually used, the mineralization-sensitive diversion temporary plugging agent is used as an additive for diversion acidification, after acid liquor is added into the diversion agent, when the concentration of calcium ions generated in the reaction process of the acid liquor and a stratum is increased to 3 percent, a micelle of 90-110 micrometers is formed, a high-permeability layer of the stratum can be plugged, the acid liquor is enabled to be diverted to a low-permeability layer for transformation, and a water absorption profile is improved; after acidification and water injection are resumed, the formed micelle can be quickly dissolved in water, and finally the purposes of reducing pressure and increasing yield are achieved. When the flow divider is used for a flow dividing acidification measure of a water injection well, the flow divider is directly added into acid liquor, and the adding proportion is 1.5 percent of the volume of the injected acid. When the flow divider is used for a flow dividing acidification measure of a water injection well, micelles with different particle sizes can be effectively formed, so that acid liquor is promoted to turn, and the improvement rate of a section is over 25 percent.
Example nine:
the application of the mineralization-sensitive shunt temporary plugging agent is characterized in that the mineralization-sensitive shunt temporary plugging agent is directly added into acid liquor, and the adding proportion is 3% of the volume of the injected acid.
When the diversion temporary plugging agent is actually used, the mineralization-sensitive diversion temporary plugging agent is used as an additive for diversion acidification, after acid liquor is added into the diversion agent, when the concentration of calcium ions generated in the reaction process of the acid liquor and a stratum is increased to 3-5%, a 160-190 micron micelle is formed, a high permeability layer of the stratum can be plugged, the acid liquor is promoted to be diverted to a low permeability layer for transformation, and a water absorption profile is improved; after acidification and water injection are resumed, the formed micelle can be quickly dissolved in water, the improvement rate of the section reaches 30 percent, and the aims of reducing pressure and increasing yield are better achieved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
In the case of no conflict, a person skilled in the art may combine the related technical features in the above examples according to actual situations to achieve corresponding technical effects, and details of various combining situations are not described herein.
The foregoing is illustrative of the preferred embodiments of the present invention, and the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. A mineralization-sensitive shunt temporary plugging agent is characterized in that: including alkene sulfonic acid, sodium octyl sulfate, sodium decyl sulfate, methanol and water; wherein the mass percentages of the components are respectively as follows: 20.0 to 25.0 percent of alkene sulfonic acid, 10.0 to 20.0 percent of sodium octyl sulfate, 3.0 to 5.0 percent of sodium decyl sulfate, 20.0 to 25.0 percent of methanol and the balance of water.
2. The mineralization-sensitive shunt temporary plugging agent of claim 1, wherein: the mass percentages of the alkene sulfonic acid, the octyl sodium sulfate, the decyl sodium sulfate, the methanol and the water are respectively as follows: 20.0% of alkene sulfonic acid, 10.0% of sodium octyl sulfate, 3.0% of sodium dodecyl sulfate, 20.0% of methanol and the balance of water.
3. The mineralization-sensitive shunt temporary plugging agent of claim 1, wherein: the mass percentages of the alkene sulfonic acid, the octyl sodium sulfate, the decyl sodium sulfate, the methanol and the water are respectively as follows: olefin sulfonic acid 25.0%, sodium octyl sulfate 20.0%, sodium decyl sulfate 5.0%, methanol 25.0%, and the balance of water.
4. The method for preparing a mineralization-sensitive shunt temporary plugging agent according to claim 1, wherein the preparation method comprises the following steps:
the method comprises the following steps: heating reaction vessel
Heating the reaction vessel to 60-70 ℃;
step two: adding olefin sulfonic acid and sodium octyl sulfate
After the first step is finished, adding alkene sulfonic acid and sodium octyl sulfate in the formula amount into a reaction vessel, adding half of water in the formula amount while stirring, and stirring until the alkene sulfonic acid and the sodium octyl sulfate are fully dissolved;
step three: adding sodium dodecyl sulfate
After the second step is finished, adding the sodium dodecyl sulfate with the formula amount into the mixed liquid prepared in the second step, adding the rest water, and stirring until the sodium dodecyl sulfate is fully dissolved;
step four: adding methanol solution
After the third step is finished, adding the methanol solution with the formula amount into the mixed solution, and continuously stirring for 15-20 minutes;
step five: temperature reduction
And D, cooling the mixed solution prepared in the step four to room temperature to obtain the mineralization-degree-sensitive shunt temporary plugging agent.
5. The method for preparing a mineralization-sensitive shunt temporary plugging agent according to claim 4, wherein the mineralization-sensitive shunt temporary plugging agent comprises the following components: the reaction vessel adopts a reaction kettle.
6. The method for preparing a mineralization-sensitive shunt temporary plugging agent according to claim 4, wherein the mineralization-sensitive shunt temporary plugging agent comprises the following components: the temperature of the heated reaction vessel in the first step is heated to 65 ℃.
7. The method for preparing a mineralization-sensitive shunt temporary plugging agent according to claim 4, wherein the mineralization-sensitive shunt temporary plugging agent comprises the following components: in the fourth step, the methanol solution is added into the mixed solution for continuous stirring for 18 minutes.
8. The application of the mineralization-sensitive shunt temporary plugging agent is characterized in that: the mineralization sensitive shunt temporary plugging agent prepared by any one of claims 4-7 is applied to the shunt acidification process of a water injection well.
9. The use of a mineralization-sensitive shunt temporary plugging agent according to claim 8, wherein: the application method is that the mineralization-sensitive shunt temporary plugging agent is directly added into the acid liquor, and the adding proportion is 1.5-3.0% of the volume of the injected acid.
10. The use of a mineralization-sensitive shunt temporary according to claim 9, wherein: the injection proportion of the mineralization-sensitive shunt temporary plugging agent is 2.0 percent of the volume of the injected acid.
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