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High temperature resistant pre-crosslinked granular profile control agent and preparation method and application thereof

A technology of pre-crosslinking and profile control agent, which is applied in the direction of chemical instruments and methods, earthwork drilling, drilling compositions, etc. Solve problems such as limited salt performance, achieve good elasticity and expansion performance, good effect of increasing oil and reducing water, and improve water flooding efficiency

Active Publication Date: 2014-09-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Before 2005, the surface pre-crosslinked bulky granular profile control agent had been widely used in high-permeability, medium-low temperature water well profile control, and good results were seen, but the product’s application effect on high-temperature wells became poor, and the temperature resistance performance was not good. make a breakthrough
[0010] The above-mentioned patents are only applicable to the profile control of fractures and large channels whose formation temperature is lower than 100°C. When the temperature rises above 110°C, it will be hydrated and degraded into water and filler particles within 1 week, and the plugging effect will be reduced. Poor, manifested in the rapid drop of water injection pressure after profile control, poor oil increase effect and short validity period
Conventional pre-crosslinked granular profile control agents have limited heat and salt resistance, and their application effect is poor in high temperature and high salinity formations

Method used

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  • High temperature resistant pre-crosslinked granular profile control agent and preparation method and application thereof
  • High temperature resistant pre-crosslinked granular profile control agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 1. Preparation of production equipment: design and manufacture production equipment for one production of 2 tons of pre-crosslinked profile control agent.

[0053] Mixing tank: vertical cylindrical mixing tank with a bottom cross-sectional area of ​​3m 2 , with a height of 1m and a full load of 3m 3 . Open, normal temperature and pressure.

[0054] The liquid storage tank is 1.985m long, 0.99m wide, 0.75m high, and has a cross-sectional area of ​​1.965m 2 , volume 1.5m 3 , The stock solution is used to dilute the water glass. A centrifugal pump can be used to directly add diluted water glass to the mixing tank.

[0055] 2. The production process is as follows:

[0056] 1) Accurately weigh 400 kg of acrylamide monomer (16 bags), add 766 kg of water (liquid height 25.5 cm), and stir until the acrylamide monomer is completely dissolved.

[0057] 2) Accurately measure 40 kg of acrylic acid solution (concentration of stock solution) and pour it into the mixing tank an...

Embodiment 2

[0070] 1. Preparation of production equipment: design and manufacture production equipment for one production of 2 tons of pre-crosslinked profile control agent.

[0071] Mixing tank: vertical cylindrical mixing tank with a bottom cross-sectional area of ​​3m 2 , with a height of 1m and a full load of 3m 3 . Open, normal temperature and pressure.

[0072] The liquid storage tank is 1.985m long, 0.99m wide, 0.75m high, and has a cross-sectional area of ​​1.965m 2 , volume 1.5m 3 , The stock solution is used to dilute the water glass. A centrifugal pump can be used to directly add diluted water glass to the mixing tank.

[0073] 2. The production process is as follows:

[0074] 1) Accurately weigh 500 kg of acrylamide monomer (20 bags), add 766 kg of water (liquid height 25.5 cm), and stir until the acrylamide monomer is completely dissolved.

[0075] 2) Accurately measure 40 kg of acrylic acid solution (concentration of stock solution) and pour it into the mixing tank an...

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Abstract

The invention discloses a high temperature resistant pre-crosslinked granular profile control agent and a preparation method and application thereof. The profile control agent comprises 18%-25% of acrylamide monomer, 1.5%-3% of acrylic acid, 0.02%-0.03% of N,N-methylene bisacrylamide, 0.05%-0.12% of a silane coupling agent, 0.30%-0.5% of phenol, 0.4%-0.6% of formaldehyde, 0.3%-0.6% of ammonium persulfate, 6%-7% of sodium silicate, 4%-10% of oil well cement and the balance of water. The high temperature resistant pre-crosslinked granular profile control agent is good in temperature resistant performance, the temperature resistant performance is improved from 110 DEG C to more than 140 DEG C, and the high temperature resistant pre-crosslinked granular profile control agent has good elastic deformation performance, and can meet the need of profile control of common high temperature deep wells.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, and more specifically relates to a preparation method and application of a high-temperature-resistant pre-crosslinked granular profile control agent. Background technique [0002] Profile control technology is a technology for controlling water, stabilizing production and increasing production in waterflood development oilfields. The role of profile control technology is to block water channeling channels and improve the efficiency of water flooding. For water flooding development oilfields, once the injected water rushes to a certain oil well, it will cause water flooding of the oil well, decrease in production, increase in water cut, and greatly reduce the efficiency of water flooding, especially the water channeling caused by fractures and large pores. There are many profile control agents and their types for different formation conditions. Among them, profile control in high-temperatur...

Claims

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Application Information

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IPC IPC(8): C09K8/42C08F220/56C08F220/06C08F2/44E21B33/13
CPCC09K8/5083C09K8/512
Inventor 李亚林吴雷泽吴笃俊邓明坚岳泉
Owner CHINA PETROLEUM & CHEM CORP
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