Compound profile control agent for plugging large pore path of oil layer and preparation method thereof

A large channel and profile control agent technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor plugging effect of large channels, small increase in profile control pressure, and escape, etc., to achieve the effect of increasing production Obvious, large pressure increase, low cost effect

Inactive Publication Date: 2017-04-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a compound profile control agent for plugging large pores in oil layers, which can overcome the small increase in profile control pressure and poor plugging effect of large pores in the prior art when there are large pores in the profile control well. Disadvantages of dissecting agent breaking out from the corresponding oil well

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The composite profile control agent used for plugging the large pores of the oil layer in this embodiment is composed of the following components in weight percentage: 10% water glass, 3% ethyl acetate, 0.5% ammonium chloride, and 1.5% fibrous solids of papermaking wastewater , and the balance is water. Wherein the modulus of water glass is 2.8, Na 2 O mSiO 2 The weight percentage is 30%.

[0022] The preparation method of the composite profile control agent for plugging the large pores of the oil layer in this embodiment comprises the following steps:

[0023] 1) Add ethyl acetate and ammonium chloride to water with a formula volume of 50% to obtain a mixture;

[0024] 2) Under the condition of stirring, in the mixture obtained in step 1), add the water glass in the formula amount, the fibrous solid of papermaking wastewater and the remaining water, and mix evenly to obtain the product.

[0025] After the preparation of the composite profile control agent for plugg...

Embodiment 2

[0027] The composite profile control agent used for plugging the large pores of the oil layer in this embodiment is composed of the following components in weight percentage: 20% of water glass, 1% of ethyl acetate, 0.8% of ammonium chloride, and 2% of fibrous solids in papermaking wastewater , and the balance is water. Wherein the modulus of water glass is 3.0, Na 2 O mSiO 2 The weight percentage is 32%.

[0028] The preparation method of the composite profile control agent for plugging the large pores of the oil layer in this embodiment comprises the following steps:

[0029] 1) Add ethyl acetate and ammonium chloride to water with a formula volume of 50% to obtain a mixture;

[0030] 2) Under the condition of stirring, in the mixture obtained in step 1), add the water glass in the formula amount, the fibrous solid of papermaking wastewater and the remaining water, and mix evenly to obtain the product.

[0031] After the preparation of the composite profile control agent...

Embodiment 3

[0033] The composite profile control agent used for plugging the large pores of the oil layer in this embodiment is composed of the following components in weight percentage: 15% of water glass, 2% of ethyl acetate, 0.9% of ammonium chloride, and 0.5% of fibrous solids in papermaking wastewater , and the balance is water. Wherein the modulus of water glass is 3.2, Na 2 O mSiO 2 The weight percent composition is 35%.

[0034] The preparation method of the composite profile control agent for plugging the large pores of the oil layer in this embodiment comprises the following steps:

[0035] 1) Add ethyl acetate and ammonium chloride to water with a formula volume of 50% to obtain a mixture;

[0036] 2) Under the condition of stirring, in the mixture obtained in step 1), add the water glass in the formula amount, the fibrous solid of papermaking wastewater and the remaining water, and mix evenly to obtain the product.

[0037] After the preparation of the composite profile co...

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Abstract

The invention discloses a compound profile control agent for plugging a large pore path of an oil layer and a preparation method thereof. The compound profile control agent is composed of the following components in percentage by weight: 10-30% of water glass, 0.5-3% of ethyl acetate, 0.3-1% of ammonium chloride, 0.1-3% of an additive and the balance of water. The additive is paper pulp or a paper-making waste water fibroid solid. The compound profile control agent for plugging the large pore path of the oil layer disclosed by the invention can overcome the defects that in the prior art, the profile control pressure is small in improving extent and the profile control agent is likely to flee from a corresponding oil well when a profile control well has the large pore path, effectively plugs the large pore path, and has a good profile control effect.

Description

technical field [0001] The invention relates to a composite profile control agent for plugging large pores in oil layers and a preparation method thereof, belonging to the technical field of petroleum exploitation. Background technique [0002] Most of my country's oil fields are continental deposits, and the heterogeneity of oil layers is serious. In the process of oilfield exploitation, water injection development is the main oil recovery method. After long-term water injection development, due to water flushing and clay loss, the heterogeneity of the formation is deteriorated, and the permeability of the higher permeability formation is further increased, and even formed. Channeling in large pores leads to serious low-efficiency circulation of injected water, and the water content of the produced fluid in some reservoirs has reached over 95%, so it is urgent to further improve the water development effect. [0003] In order to make the injected water advance evenly and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/514
CPCC09K8/514C09K2208/08
Inventor 耿超丁连民王雷绪毛为成吕兆雷杨军虎燕収广李新丹
Owner CHINA PETROLEUM & CHEM CORP
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