Gel plugging agent for plugging fluid channeling big channel of medium-temperature oil reservoir and preparation method thereof

A technology of plugging control agent and large pore channel, which is applied in the field of oil production of water injection wells, can solve problems such as poor strength and unstable system, and achieve the effects of good thermal stability, good solubility and good injection performance.

Inactive Publication Date: 2017-04-26
CNPC GREATWALL DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes the problems of unstable system and poor strength caused by salt degradation, metal ion degradation and shear viscosity reduction under the action of high salinity, high salinity and high shear in the existing gel-based control and displacement system

Method used

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  • Gel plugging agent for plugging fluid channeling big channel of medium-temperature oil reservoir and preparation method thereof

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preparation example Construction

[0020] A preparation method of a gel plugging agent for plugging channeling large pores in medium-temperature oil reservoirs, the method steps are as follows: take acrylamide, molecular chain grafting enhancer, N,N-methylene according to the above mass ratio Bisacrylamide, azobisisobutylamidine hydrochloride and water, add acrylamide, N, N-methylenebisacrylamide, azobisisobutylamidine hydrochloride in sequence, and then Add the molecular chain grafting enhancer and stir to disperse it evenly to get this product.

[0021] "Medium-temperature oil reservoir" in the name of the present invention (gel plugging agent and preparation method for blocking channeling large pores in medium-temperature oil reservoirs) refers to oil reservoirs with a temperature between 40°C and 90°C, and "large "Channel" means a channel with a diameter greater than 50 μm.

[0022] When in use, the plugging control agent of the present invention is injected into the formation or porous medium, and at mode...

Embodiment 1

[0024] Take acrylamide according to the following mass ratio: 3.0%; molecular chain grafting enhancer: 3.0%; N, N-methylenebisacrylamide: 0.03%; azobisisobutylamidine hydrochloride: 0.005%; Water, the sum of the mass percentages of each component is 100%;

[0025] Add acrylamide, N, N-methylenebisacrylamide, azobisisobutylamidine hydrochloride to water in turn, after dissolving, add molecular chain grafting enhancer and stir to disperse evenly to obtain this product . Seal the beaker containing this product and put it into an incubator, set the temperature at 70°C, and record the gelation time and gelation state. After observation, the gelled state is a rigid gel, and the gelled time is 25 hours.

Embodiment 2

[0027] Take acrylamide according to the following mass ratio: 3.5%; molecular chain grafting enhancer: 4.5%; N, N-methylenebisacrylamide: 0.1%; azobisisobutylamidine hydrochloride: 0.01%; Water, the sum of the mass percentages of each component is 100%;

[0028] Add acrylamide, N, N-methylenebisacrylamide, azobisisobutylamidine hydrochloride to water in turn, after dissolving, add molecular chain grafting enhancer and stir to disperse evenly to obtain this product . Seal the beaker containing this product and put it into an incubator, set the temperature at 70°C, and record the gelation time and gelation state. After observation, the gelled state was a rigid gel, and the gelled time was 16 hours.

[0029] A physical model experiment was used to evaluate the plugging performance of the gel plugging modifier prepared in Example 2. The plugging adjustment system solution prepared according to the method of Example 2 is ready for use. Fill sand tubes with a length of 100cm wit...

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Abstract

The invention relates to the technical field of water injection well oil extraction and especially relates to a rigid gel plugging agent for plugging a fluid channeling big channel of a medium-temperature oil reservoir. The rigid gel plugging agent comprises, by mass, 3.0% to 5.0% of acrylamide, 3.0% to 5.0% of a molecular chain-grafted enhancer, 0.03% to 0.15% of N, N-methylene bisacrylamide, 0.005% to 0.015% of azobis(isobutyramidine) hydrochloride and the balance of water. The rigid gel plugging agent has good shear and salt resistance, high strength, good thermal stability, good solubility and cold water solubility, and can form a uniform solution which is not easy to settle and has good injection performances. The solution of the rigid gel plugging agent before gelling has a certain viscosity. Through combined action of a gelling control agent and a reservoir temperature, the rigid gel plugging agent forms gel underground and gelling time can be controlled.

Description

[0001] Technical field: [0002] The invention relates to the technical field of oil production of water injection wells, in particular to a rigid gel plugging regulator used for blocking channeling large pores in medium-temperature oil reservoirs. [0003] Background technique: [0004] With the continuous deepening of oilfield development, large pores with a certain thickness often appear in water-flooded reservoirs, that is, high-permeability strips or channeling channels. There are two main types of large pores: one is the primary large pores in the oil layer, such as fractures, ultra-high permeability layers or strips; the other is the secondary large pores formed after long-term displacement. Therefore, in the middle and later stages of reservoir waterflooding development, the plugging of deep large pores in the reservoir has become one of the important measures to enhance oil recovery. Because the diameter of pore throats in large-porosity reservoirs exceeds 50 μm, it i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/44C08F251/00C08F220/56C08F222/38
CPCC09K8/44C08F251/00C08F220/56C08F222/385
Inventor 董家峰彭勃郑观辉张志良郑得志汪晓多王涛吴捷刘岩
Owner CNPC GREATWALL DRILLING ENG
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