CN110242248B - Sandstone reservoir water-plugging acidification process method - Google Patents
Sandstone reservoir water-plugging acidification process method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 81
- 230000020477 pH reduction Effects 0.000 title claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 37
- 239000011259 mixed solution Substances 0.000 claims abstract description 31
- 230000007797 corrosion Effects 0.000 claims abstract description 30
- 238000005260 corrosion Methods 0.000 claims abstract description 30
- 239000007788 liquid Substances 0.000 claims abstract description 28
- 239000000243 solution Substances 0.000 claims abstract description 25
- 150000007524 organic acids Chemical class 0.000 claims abstract description 16
- 239000000654 additive Substances 0.000 claims abstract description 14
- 239000012530 fluid Substances 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 14
- 238000005086 pumping Methods 0.000 claims abstract description 13
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000003129 oil well Substances 0.000 claims abstract description 9
- 230000000996 additive effect Effects 0.000 claims abstract description 8
- 230000015271 coagulation Effects 0.000 claims abstract description 5
- 238000005345 coagulation Methods 0.000 claims abstract description 5
- 239000000725 suspension Substances 0.000 claims abstract description 5
- 239000003381 stabilizer Substances 0.000 claims description 28
- 239000002253 acid Substances 0.000 claims description 25
- 239000003112 inhibitor Substances 0.000 claims description 16
- 239000004927 clay Substances 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 14
- -1 iron ion Chemical class 0.000 claims description 14
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid group Chemical group C(CC(O)(C(=O)O)CC(=O)O)(=O)O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- RGHNJXZEOKUKBD-SQOUGZDYSA-N D-gluconic acid Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 claims description 6
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- RGHNJXZEOKUKBD-UHFFFAOYSA-N D-gluconic acid Natural products OCC(O)C(O)C(O)C(O)C(O)=O RGHNJXZEOKUKBD-UHFFFAOYSA-N 0.000 claims description 3
- 229920000289 Polyquaternium Polymers 0.000 claims description 3
- 125000002091 cationic group Chemical group 0.000 claims description 3
- 239000000174 gluconic acid Substances 0.000 claims description 3
- 235000012208 gluconic acid Nutrition 0.000 claims description 3
- 239000004310 lactic acid Substances 0.000 claims description 3
- 235000014655 lactic acid Nutrition 0.000 claims description 3
- 239000004530 micro-emulsion Substances 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 150000003242 quaternary ammonium salts Chemical class 0.000 claims description 3
- HLWRUJAIJJEZDL-UHFFFAOYSA-M sodium;2-[2-[bis(carboxymethyl)amino]ethyl-(carboxymethyl)amino]acetate Chemical compound [Na+].OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC([O-])=O HLWRUJAIJJEZDL-UHFFFAOYSA-M 0.000 claims description 3
- 239000011148 porous material Substances 0.000 abstract description 7
- 238000001556 precipitation Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 13
- 239000003921 oil Substances 0.000 description 11
- 238000010276 construction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 230000005764 inhibitory process Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 239000013032 Hydrocarbon resin Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000009096 changqing Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 229920006270 hydrocarbon resin Polymers 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000013268 sustained release Methods 0.000 description 1
- 239000012730 sustained-release form Substances 0.000 description 1
- 229930195735 unsaturated hydrocarbon Natural products 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
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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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/72—Eroding chemicals, e.g. acids
- C09K8/74—Eroding chemicals, e.g. acids combined with additives added for specific purposes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention provides a water plugging and acidifying process method for a sandstone reservoir, which comprises the following specific steps: the weight portions are as follows: step one, stirring and adding 17-20 parts of organic acid mixed solution into 80 parts of water, then adding 4-5 parts of additive, and uniformly mixing to obtain mixed solution; stirring and mixing 1/2 of the volume of the mixed solution prepared in the step one and 16-20 parts of temporary plugging agent to prepare suspension, so as to obtain a preposed liquid of the temporary plugging agent, and taking the rest mixed solution as a postposition liquid; step three, stirring and adding 17-20 parts of organic acid mixed solution and 1.0-1.5 parts of hydrofluoric acid into 80 parts of water to obtain mixed solution, then adding 4-5 parts of additive, and uniformly mixing to obtain an acidizing fluid system; and step four, pumping the temporary plugging agent pre-solution prepared in the step two into a target layer in the oil well, and waiting for coagulation. The acidizing fluid adopted by the invention has the characteristics of low corrosion strength, less secondary precipitation and degradability, no flowback process is needed, and the used temporary plugging agent can preferentially enter a large pore passage.
Description
Technical Field
The invention relates to a water plugging and acidifying process method for a sandstone reservoir, belonging to the technical field of oil exploitation and recovery efficiency improvement.
Background
In the development of heterogeneous sandstone reservoirs, along with the development process, the contradiction between reservoir layers is intensified more and more, which mainly shows that the water content of a high-permeability layer is increased, and oil in a low-permeability layer is hardly used. Water plugging and acidification are always important technologies for stabilizing and controlling oil and water and increasing yield and injection of oil-water wells, however, the phenomenon that water content of an oil well is reduced and crude oil yield is not improved often occurs in the water plugging operation process, and most of acid liquor enters a high permeability layer by adopting conventional acidification operation, so that interlayer contradiction is aggravated. In order to solve the interlayer contradiction, the liquid production profile of the stratum needs to be optimized, a high water-bearing stratum is blocked, and an oil-bearing low permeable layer is acidified. The technology of combining water shutoff and acidification at home and abroad is generally adopted as follows: one is a mechanical steering acidification technology, and realizes steering by controlling the number of liquid inlet points by means of a packer or a blocking ball; one is chemical diverting acidification technology, which uses foam, polymer or viscoelastic surfactant to increase the flow resistance of acid liquid to achieve diversion. However, the technology has the problems of high equipment cost, weak plugging strength, short validity period, high possibility of reservoir damage and the like.
For example, chinese patents CN201778767U and CN2779053Y disclose an integrated pipe column for finding water, blocking water, acidifying and breaking blocking, and a packer for continuous chemical water blocking and acidifying, respectively, which rely on perfect equipment to achieve the purpose of continuous operation and efficiency improvement. However, the method has the disadvantages of high equipment cost, more related underground switches, complex operation and high requirement on the stability of connection of all levels of equipment. Therefore, it is very inconvenient in practical use.
Disclosure of Invention
In order to overcome the problems of complex operation and inconvenient application in the prior art, the invention provides a water plugging and acidifying process method for a sandstone reservoir, and the oil-soluble temporary plugging agent adopted by the invention has better acid resistance and good preferential accessibility to a large pore canal of a high-permeability layer; the corrosion strength of the used acid liquor to the shaft is low, and the damage to the stratum is small; the acid solution is degradable acid, and is not required to be drained back, so that the process procedures are reduced; the invention has simple and convenient operation and construction, can achieve the aim of the invention only by uniformly mixing the required solutions and then sequentially injecting the solutions, and is convenient for popularization and application.
The technical scheme adopted by the invention is as follows:
a water shutoff and acidification process method for a sandstone reservoir comprises the following specific steps: the weight portions are as follows:
step one, stirring and adding 17-20 parts of organic acid mixed solution into 80 parts of water, then adding 4-5 parts of additive, and uniformly mixing to obtain mixed solution;
stirring and mixing 1/2 of the volume of the mixed solution prepared in the step one and 16-20 parts of temporary plugging agent to prepare suspension, so as to obtain a preposed liquid of the temporary plugging agent, and taking the rest mixed solution as a postposition liquid;
step three, stirring and adding 17-20 parts of organic acid mixed solution and 1.0-1.5 parts of hydrofluoric acid into 80 parts of water to obtain mixed solution, then adding 4-5 parts of additive, and uniformly mixing to obtain an acidizing fluid system;
pumping the temporary plugging agent pre-solution prepared in the step two into a target layer in an oil well, and waiting for coagulation; pumping the acidizing fluid system prepared in the third step; and finally pumping the post liquid obtained in the step two.
The organic acid mixed liquid in the first step and the organic acid mixed liquid in the third step are the same and are acid liquid formed by mixing lactic acid and gluconic acid;
the additives in the first step and the third step are the same, and the components in parts by weight are as follows: 1-2 parts of corrosion inhibitor, 1 part of iron ion stabilizer and 2 parts of clay stabilizer.
The additives in the first step and the third step are the same, and the components in parts by weight are as follows: 1.5 parts of corrosion inhibitor, 1 part of iron ion stabilizer and 2 parts of clay stabilizer.
The corrosion inhibitor is a Mannich base or Mannich base quaternary ammonium salt microemulsion corrosion inhibitor.
The iron ion stabilizer is citric acid or ethylene diamine tetraacetic acid sodium salt chelating iron ion stabilizer.
The clay stabilizer is polyacrylamide or polyquaternium cationic clay stabilizer.
The particle size of the temporary plugging agent in the second step is 100 meshes.
And the temporary plugging agent in the second step is an oil-soluble temporary plugging agent.
The invention has the beneficial effects that:
(1) the oil-soluble temporary plugging agent adopted by the method has better acid resistance and good preferential entry property to the large pore canal of a high-permeability layer;
(2) the acid liquor used by the method has small corrosion strength to the shaft and small damage to the stratum;
(3) the acid solution used by the method is degradable acid, and is not required to be drained back, so that the process procedures are reduced;
(4) the invention has simple and convenient operation and construction, can achieve the aim of the invention only by uniformly mixing the required solutions and then sequentially injecting the solutions, and is convenient for popularization and application.
Detailed Description
Example 1:
in order to overcome the problems of complex operation and inconvenient application in the prior art, the invention provides a water plugging and acidifying process method for a sandstone reservoir, and the oil-soluble temporary plugging agent adopted by the invention has better acid resistance and good preferential accessibility to a large pore canal of a high-permeability layer; the corrosion strength of the used acid liquor to the shaft is low, and the damage to the stratum is small; the acid solution is degradable acid, and is not required to be drained back, so that the process procedures are reduced; the invention has simple and convenient operation and construction, can achieve the aim of the invention only by uniformly mixing the required solutions and then sequentially injecting the solutions, and is convenient for popularization and application.
A water shutoff and acidification process method for a sandstone reservoir comprises the following specific steps: the weight portions are as follows:
step one, stirring and adding 17-20 parts of organic acid mixed solution into 80 parts of water, then adding 4-5 parts of additive, and uniformly mixing to obtain mixed solution;
stirring and mixing 1/2 of the volume of the mixed solution prepared in the step one and 16-20 parts of temporary plugging agent to prepare suspension, so as to obtain a preposed liquid of the temporary plugging agent, and taking the rest mixed solution as a postposition liquid;
step three, stirring and adding 17-20 parts of organic acid mixed solution and 1.0-1.5 parts of hydrofluoric acid into 80 parts of water to obtain mixed solution, then adding 4-5 parts of additive, and uniformly mixing to obtain an acidizing fluid system;
pumping the temporary plugging agent pre-solution prepared in the step two into a target layer in an oil well, and waiting for coagulation; pumping the acidizing fluid system prepared in the third step; and finally pumping the post liquid obtained in the step two.
The oil-soluble temporary plugging agent adopted by the method has better acid resistance and good preferential entry property to the large pore canal of a high-permeability layer; the acid liquor used by the method has small corrosion strength to the shaft and small damage to the stratum; the acid solution used by the method is degradable acid, and is not required to be drained back, so that the process procedures are reduced; the invention has simple and convenient operation and construction, can achieve the aim of the invention only by uniformly mixing the required solutions and then sequentially injecting the solutions, and is convenient for popularization and application. The method of the invention adopts the acidizing fluid which has the characteristics of low corrosion strength, less secondary precipitation and degradability, does not need a flowback process, and the temporary plugging agent can preferentially enter a large pore passage.
The temporary plugging agent pre-liquid plugging agent has excellent plugging performance; the generation amount of precipitates of the acidification liquid system is less, the corrosion rate is lower under the condition of 70 ℃, and the slow release rate is more than 97 percent.
Example 2:
based on the embodiment 1, the organic acid mixed solution in the first step and the organic acid mixed solution in the third step in this embodiment are the same, and are an acid solution formed by mixing lactic acid and gluconic acid;
the additives in the first step and the third step are the same, and the components in parts by weight are as follows: 1-2 parts of corrosion inhibitor, 1 part of iron ion stabilizer and 2 parts of clay stabilizer.
The additives in the first step and the third step are the same, and the components in parts by weight are as follows: 1.5 parts of corrosion inhibitor, 1 part of iron ion stabilizer and 2 parts of clay stabilizer.
The corrosion inhibitor is a Mannich base or Mannich base quaternary ammonium salt microemulsion corrosion inhibitor.
The iron ion stabilizer is citric acid or ethylene diamine tetraacetic acid sodium salt chelating iron ion stabilizer.
The clay stabilizer is polyacrylamide or polyquaternium cationic clay stabilizer.
The particle size of the temporary plugging agent in the second step is 100 meshes.
And the temporary plugging agent in the second step is an oil-soluble temporary plugging agent.
The oil-soluble temporary plugging agent in the embodiment is prepared from heavy unsaturated hydrocarbon resin, an oil-soluble polymer and a surfactant, and the particle size is 100 meshes.
The corrosion inhibitor, iron ion stabilizer, and clay stabilizer in this example were all purchased from Changqing downhole additives.
The oil-soluble temporary plugging agent adopted by the method has better acid resistance and good preferential entry property to the large pore canal of a high-permeability layer; the acid liquor used by the method has small corrosion strength to the shaft and small damage to the stratum; the acid solution used by the method is degradable acid, and is not required to be drained back, so that the process procedures are reduced; the invention has simple and convenient operation and construction, can achieve the aim of the invention only by uniformly mixing the required solutions and then sequentially injecting the solutions, and is convenient for popularization and application.
Example 3:
the embodiment provides a water plugging and acidifying process method for a sandstone reservoir, which comprises the following steps:
(1) adding 8000kg of water into a container with a pump circulation or a stirrer, starting the pump circulation, slowly adding 1700kg of organic acid mixed solution, then adding 200kg of corrosion inhibitor, 100kg of iron ion stabilizer and 200kg of clay stabilizer, stirring for 30 minutes, uniformly mixing the solution, slowly adding 1600kg of oil-soluble temporary plugging agent into 1/2 volume of mixed solution to form temporary plugging agent particle suspension, namely the pre-solution; taking the rest mixed solution as a postliquid;
(2) simultaneously, 8000kg of water is added into another container with a pump circulation or a stirrer, then the pump circulation is started, 1700kg of organic acid mixed solution and 100kg of hydrofluoric acid are slowly added, 200kg of corrosion inhibitor, 100kg of iron ion stabilizer and 200kg of clay stabilizer are added, and stirring is carried out for 30 minutes, so that the solutions are uniformly mixed to form an acidizing fluid system;
(3) pumping the pre-solution prepared in the step (1) into a target layer in an oil well, waiting for 24 hours for coagulation, then pumping the acidizing fluid system prepared in the step (2), and finally pumping the post-solution prepared in the step (1).
The daily liquid yield of the oil well before the measure is 1.9t, the oil amount is 0.22t, the water content is 88.4 percent, the daily liquid yield after the measure is 10.2t, the oil amount is 4.1t, and the water content is 59.6 percent.
Example 4:
based on the embodiment 3, the sandstone reservoir water shutoff and acidification process method described in the embodiment is different in that: the adding amount of the organic acid mixed solution in the step (1) is 2000 kg; the adding amount of the oil-soluble temporary plugging agent in the step (1) is 1800 kg; the addition of the corrosion inhibitor in the steps (1) and (2) is 100 kg.
The daily liquid yield of the oil well before the measure is 1.4t, the oil amount is 0.25t, the water content is 82.2 percent, the daily liquid yield after the measure is 13.5t, the oil amount is 8.1t, and the water content is 40 percent.
Example 5:
based on the embodiment 3, the sandstone reservoir water shutoff and acidification process method described in the embodiment is different in that: the adding amount of the oil-soluble temporary plugging agent in the step (1) is 2000 kg; the hydrofluoric acid adding amount in the step (2) is 150 kg; the addition of the corrosion inhibitor in the steps (1) and (2) is 150 kg.
The daily liquid yield of the oil well before the measure is 17.6t, the oil amount is 0.3t, the water content is 98.3 percent, the daily liquid yield after the measure is 14.3t, the oil amount is 8.1t, and the water content is 43.4 percent.
Example 6:
based on the embodiments 3 to 6, in the embodiment, the temporary plugging agent prepared in the embodiments 3 to 5 is used for plugging performance evaluation indoors by using a sand-filled pipe and a displacement device, and the water-phase permeability of the sand-filled pipe before and after plugging is tested by water drive to calculate the plugging rate; the corrosion inhibition performance and the generation amount of precipitates of the acidizing fluid system prepared in the embodiment 3-5 are tested according to the water-based fracturing fluid performance evaluation method of the standard SY/T5107-2005 in the oil and gas industry (the corrosion rate is compared with 20% hydrochloric acid, the corrosion inhibition rate of the system in the embodiment is determined, and the corrosion rate of the 20% hydrochloric acid to the steel sheet is 1244.5 g/(m)2H)), the detection results are shown in table 1:
TABLE 1 occlusion and sustained Release rates of the products of the examples
| Sample (I) | k 1/10-3μm2 | k 2/10-3μm2 | Plugging Rate/% | Amount of precipitate formed/mg/L | Corrosion rate/g/(m) at 70 DEG C2﹒h) | Inhibition rate/%) |
| Product of example 1 | 1453.5 | 76.3 | 94.75 | 39 | 1.8934 | 99.85 |
| Product of example 2 | 1569.5 | 103.6 | 93.39 | 37 | 1.8435 | 99.85 |
| Product of example 3 | 1492.3 | 84.2 | 94.36 | 41 | 1.7952 | 99.86 |
As can be seen from table 1, the temporary plugging agent in the above embodiment is excellent in plugging performance with the pad fluid; the generation amount of precipitates of the acidification liquid system is less, the corrosion rate is lower under the condition of 70 ℃, and the slow release rate is more than 97 percent.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention. The reagents and the methods thereof which are not described in detail in this embodiment belong to the well-known techniques and common methods in the industry, and are not described herein.
Claims (8)
1. A water shutoff and acidification process method for a sandstone reservoir is characterized by comprising the following steps: the method comprises the following specific steps: the weight portions are as follows:
step one, stirring and adding 17-20 parts of organic acid mixed solution into 80 parts of water, then adding 4-5 parts of additive, and uniformly mixing to obtain mixed solution;
stirring and mixing 1/2 of the volume of the mixed solution prepared in the step one and 16-20 parts of temporary plugging agent to prepare suspension, so as to obtain a preposed liquid of the temporary plugging agent, and taking the rest mixed solution as a postposition liquid;
step three, stirring and adding 17-20 parts of organic acid mixed solution and 1.0-1.5 parts of hydrofluoric acid into 80 parts of water to obtain mixed solution, then adding 4-5 parts of additive, and uniformly mixing to obtain an acidizing fluid system;
pumping the temporary plugging agent pre-solution prepared in the step two into a target layer in an oil well, and waiting for coagulation; pumping the acidizing fluid system prepared in the third step; and finally pumping the post liquid obtained in the step two.
2. The sandstone reservoir water shutoff and acidification process method of claim 1, wherein the process method comprises the following steps: the organic acid mixed liquid in the first step and the third step is acid liquid formed by mixing lactic acid and gluconic acid.
3. The sandstone reservoir water shutoff and acidification process method of claim 1, wherein the process method comprises the following steps: the particle size of the temporary plugging agent in the second step is 100 meshes.
4. The sandstone reservoir water shutoff and acidification process method of claim 1, wherein the process method comprises the following steps: and the temporary plugging agent in the second step is an oil-soluble temporary plugging agent.
5. The sandstone reservoir water shutoff and acidification process method of claim 1, wherein the process method comprises the following steps: the additives in the first step and the third step are the same, and the components in parts by weight are as follows: 1-2 parts of corrosion inhibitor, 1 part of iron ion stabilizer and 2 parts of clay stabilizer.
6. The sandstone reservoir water shutoff and acidification process method of claim 5, wherein the process method comprises the following steps: the corrosion inhibitor is a Mannich base or Mannich base quaternary ammonium salt microemulsion corrosion inhibitor.
7. The sandstone reservoir water shutoff and acidification process method of claim 5, wherein the process method comprises the following steps: the iron ion stabilizer is citric acid or ethylene diamine tetraacetic acid sodium salt chelating iron ion stabilizer.
8. The sandstone reservoir water shutoff and acidification process method of claim 5, wherein the process method comprises the following steps: the clay stabilizer is polyacrylamide or polyquaternium cationic clay stabilizer.
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| CN116218498B (en) * | 2021-12-06 | 2024-07-02 | 中国石油天然气股份有限公司 | Fire flooding large well repairing and blocking removing composition, preparation method of degradable temporary blocking ball and layered blocking removing method |
| CN114774097A (en) * | 2022-05-07 | 2022-07-22 | 陕西日新石油化工有限公司 | Injection increasing agent for water injection well of low-permeability oil reservoir and preparation method thereof |
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| CN105041289B (en) * | 2015-07-13 | 2016-06-01 | 中国石油大学(北京) | Method for forming multiple seams by temporarily blocking seam and forcibly turning plane |
| CN106382113B (en) * | 2016-09-07 | 2019-05-10 | 中国石油化工股份有限公司 | A kind of temporary stall suitable for sandstone oil reservoir is to acidization tool |
| CN108343417A (en) * | 2018-01-31 | 2018-07-31 | 中国石油天然气股份有限公司 | Method for temporary plugging layered reconstruction of gas well and application |
| CN108412473A (en) * | 2018-02-24 | 2018-08-17 | 中国石油天然气股份有限公司 | Online temporary plugging acidification method for water injection well |
| CN109630066A (en) * | 2019-02-27 | 2019-04-16 | 杨凌单色生物科技有限公司 | The method of low-permeability oilfield high-water-cut oil-producing well water blockoff and acidification integration of operation |
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