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Pressure reducing and injection increasing agent used for flooding well and preparation method thereof

A technology of injection enhancer and industrial product, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as difficulty in establishing an effective driving system, deviation of fluid seepage laws, and increasing difficulty in reservoir development, and achieve the The effect of microbial growth, improving seepage capacity, and increasing water permeability

Active Publication Date: 2009-09-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the throat radius of low-permeability oilfield reservoirs is small, resulting in very low permeability, which makes the seepage law of the fluid deviate from Darcy's law, and there is a starting pressure gradient, which makes the development of the reservoir more difficult
For this part of the reserves, even if the well pattern can control the sand body, it is still difficult to establish an effective driving system
The water absorption capacity of the water injection well is poor and the injection pressure is high

Method used

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  • Pressure reducing and injection increasing agent used for flooding well and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The parts by weight of each component of the pressure-reducing injection-increasing agent for water injection wells are:

[0050] 1. Lauric acid monoethanolamide (Amel CME) (industrial product): 31 parts;

[0051] 2. L-valine benzyl ester p-toluenesulfonate: 4.3 parts;

[0052] 3. C 8-10 Alkyl glucoside: 5.7 parts;

[0053] 4. Sodium nitrite (industrial product); 0.7 parts;

[0054] 5. Vitamin A (industrial product): 0.7 parts;

[0055] 6. Fluorocarbon surfactant (FN-2): 0.06 parts;

[0056] 7. Methanol (industrial product): 28 parts;

[0057] 8. Water: 30.24 parts.

[0058] Preparation method: First, add Amer CME to the enamel reaction kettle in proportion, and slowly raise the temperature to 63°C; secondly, add 10% of the required amount of methanol under constant stirring; after continuing to stir for 30 minutes, add L -Valine benzyl ester p-toluenesulfonate, C 8-10 Alkyl glucoside, stir while adding, then add sodium nitrite, vitamin A, FN-2, and the remainin...

Embodiment 2

[0061] The preparation method of depressurization and injection increasing agent for water injection well is the same as that of Example 1, and the weight ratio of each component is:

[0062] 1. Lauric acid monoethanolamide (Amel CME) (industrial product): 33 parts;

[0063] 2. L-valine benzyl ester p-toluenesulfonate: 4 parts;

[0064] 3. C 8-10 Alkyl glucoside: 6.6 parts;

[0065] 4. Sodium nitrite (industrial product); 0.8 parts;

[0066] 5. Vitamin A (industrial product): 0.75 parts;

[0067] 6. Fluorocarbon surfactant (FN-2): 0.07 parts;

[0068] 7. Methanol (industrial product): 31 parts;

[0069] 8. Water: 30.24 parts.

[0070] Effect: In X-93 well, in the injection water distribution room, use a high-pressure pump to pump the depressurization and injection-increasing agent into the high-pressure pipeline according to the ratio of 0.12% of the water injected into the well, and inject it into the formation with the injected water, and the wellhead pressure drops fr...

Embodiment 3

[0072] The preparation method of depressurization and injection increasing agent for water injection well is the same as that of Example 1, and the weight ratio of each component is:

[0073] 1. Lauric acid monoethanolamide (Amel CME) (industrial product): 36 parts;

[0074] 2. L-valine benzyl ester p-toluenesulfonate: 3.5 parts;

[0075] 3. C 8-10 Alkyl glucoside: 6.8 parts;

[0076] 4. Sodium nitrite (industrial product); 0.9 parts;

[0077] 5. Vitamin A (industrial product): 0.8 parts;

[0078] 6. Fluorocarbon surfactant (FN-2): 0.07 parts;

[0079] 7. Methanol (industrial product): 31 parts;

[0080] 8. Water: 29.93 parts.

[0081] Effect: In Well X-56, a high-pressure pump is used to pump the pressure-reducing injection-increasing agent into the high-pressure pipeline according to the proportion of 0.15% of the water injected into the water distribution room of the injected water. to 22.4MPa, a decrease of 12.84 percentage points.

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Abstract

The invention relates to a pressure reducing and injection increasing agent used for a flooding well, which is applicable to water injection of an oil well. The invention is characterized in that the pressure reducing and injection increasing agent comprises the following ingredients according to the parts by weight: 30-42 parts of lauric acid monoethanolamine, 2.5-4.5 parts of L-alinebenzylestertosilate, 5.5-7.5 parts of C8-C10 alkylglucoside, 0.5-1.0 part of sodium nitrite, 0.5-1 part of Vitamin A, 0.05-0.1 part of fluorocarbon surfactant FN-2, 25-35 parts of methanol, and 15-35 parts of water. The invention has the effects that the pressure reducing and injection increasing agent can reduce oil-water interface tension, change wettability of rocks and inhibit clay swelling, thereby reducing wellhead pressure of the flooding well by 5-15 percentage points, so as to improve the seepage ability of injected water; therefore, the pressure reducing and injection increasing agent realizes pressure reducing and injection increasing for a low-seepage oil well and can inhibit bacteria growth.

Description

technical field [0001] The invention belongs to the technical field of chemicals used in the petroleum industry, in particular to oil well water injection operations, and is a pressure-reducing and injection-increasing agent for water injection wells. Background technique [0002] At present, the throat radius of low-permeability oilfield reservoirs is small, resulting in very low permeability, which makes the seepage law of fluid deviate from Darcy's law, and there is a threshold pressure gradient, which makes the development of reservoirs more difficult. For this part of the reserves, even if the well pattern can control the sand body, it is still difficult to establish an effective driving system. As a result, the water absorption capacity of the water injection well is poor and the injection pressure is high. [0003] The Chinese patent publication number is: CN1560182. Provided is a profile control agent with near-wellbore injection effect, which is composed of alumin...

Claims

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Application Information

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IPC IPC(8): C09K8/58C09K8/52
Inventor 付亚荣田炜李造吉李冬青付丽霞吴泽美蔡远红蒲祥金游靖杨中锋牛宝歧周正奇孟威姚为有
Owner PETROCHINA CO LTD
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