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Compound crosslinking agent, preparation method of compound crosslinking agent and preparation method of profile control agent

A composite cross-linking agent and catalyst technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high volatility and toxicity, short gelation time, easy syneresis, etc., and achieve deep profile control and oil displacement effect, wide temperature adaptability, and gel system stability

Inactive Publication Date: 2017-02-22
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phenolic cross-linking agents have high volatility and toxicity, high gelation temperature and long gelation time; jelly crosslinked by high-valent metal ions has a short gelation time (10min-24h), and the temperature exceeds 75°C and is unstable. Poor temperature resistance, easy to syneresis

Method used

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  • Compound crosslinking agent, preparation method of compound crosslinking agent and preparation method of profile control agent
  • Compound crosslinking agent, preparation method of compound crosslinking agent and preparation method of profile control agent
  • Compound crosslinking agent, preparation method of compound crosslinking agent and preparation method of profile control agent

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preparation example Construction

[0036] On the other hand, based on the same inventive concept, the embodiment of the present invention provides a preparation method of the above-mentioned composite crosslinking agent, please refer to figure 1 ,include:

[0037] Step S100: preparing a phenolic prepolymer;

[0038] Please refer to figure 2 , this step includes the following sub-steps:

[0039] Step S101: After heating the phenol, add part of the basic catalyst and stir for activation for 20-30 minutes, then add part of the formaldehyde solution, raise the temperature to 60°C and stir for 40-50 minutes at a constant temperature to obtain solution A;

[0040] Described phenol is any one in phenol, resorcinol, hydroquinone. Wherein the heating temperature is controlled between 40°C-60°C, preferably 50°C. Since the melting point of phenol is 40°C, phenol can become molten at this temperature. Because the reaction to generate phenolic prepolymer is an exothermic reaction, if the heating temperature of phenol ...

Embodiment 1

[0058] Put the three-necked flask equipped with a stirrer and a condenser in an electric heating constant temperature water bath, add 33.5g of phenol, adjust the temperature to 50°C, and melt the phenol into a liquid; add 1.6g of sodium hydroxide, and stir for 20min; add formaldehyde solution ( 40%) 43.2g, heated up to 60°C, kept for 50min; added 0.8g of sodium hydroxide again, stabilized for 20min; added 23.3g of formaldehyde solution (40%), heated up to 70°C, and reacted for 30min; cooled to obtain phenolic prepolymer .

[0059] Take 99.0 g of phenolic prepolymer, add 1.0 g of chromium acetate, and mix evenly to obtain a composite crosslinking agent.

[0060] Prepare a partially hydrolyzed polyacrylamide solution with a mass fraction of 0.2%, and after aging for 24 hours, add a composite cross-linking agent to make the mass fraction 0.2%, and react at a constant temperature of 50°C for 3 days to generate a cross-linked polymer gel profile control agent. The glue viscosity i...

Embodiment 2

[0063] Put the three-neck flask equipped with a stirrer and a condenser in an electric heating constant temperature water bath, add 33.5g of phenol, adjust the temperature to 50°C, and melt the phenol into a liquid; add 1.5g of sodium hydroxide, and stir for 30min; add formaldehyde solution ( 40%) 46.5g, heated up to 60°C, kept for 50min; added 0.9g of sodium hydroxide again, stabilized for 30min; added 20.0g of formaldehyde solution (40%), heated up to 70°C, and reacted for 30min; cooled to obtain phenolic prepolymer .

[0064] Take 99.0 g of phenolic prepolymer, add 1.0 g of chromium citrate, and mix evenly to obtain a composite crosslinking agent.

[0065] Prepare a partially hydrolyzed polyacrylamide solution with a mass fraction of 0.3%. After aging for 24 hours, add a composite cross-linking agent to make the mass fraction 0.2%, and react at a constant temperature of 65°C for 1 day to generate a cross-linked polymer gel profile control agent. The glue viscosity is 14916...

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Abstract

The invention discloses a compound crosslinking agent, a preparation method of the compound crosslinking agent and a preparation method of a profile control agent and belongs to the technical field of oilfield chemistry. The compound crosslinking agent is prepared from, in percentage by weight, 98%-99% of a phenolic prepolymer and 1%-2% of organic chromium. During usage, the components are evenly mixed. By use of the crosslinked polymer gel profile control agent prepared from the compound crosslinking agent, the gel forming temperature is 50-120 DEG C, the gel forming time can be continuously controlled from several hours to several days, a formed gel system is stable, the gel viscosity can reach 11,500 Pa*s or higher, the profile control agent can be applied to oilfield water shut-off and profile control and improve heterogeneity of reservoirs, so that the oilfield mining efficiency is improved, and the technical problems that phenolic crosslinking agents are high in gel forming temperature and time-consuming and high-valence metal ion crosslinking agents are poor in temperature resistance in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a composite crosslinking agent, a preparation method thereof, and a preparation method of a profile control agent. Background technique [0002] In the middle and late stages of oilfield development, replenishing formation energy through water injection is the main measure adopted by most oilfields in my country at present. Due to the complexity and heterogeneity of the reservoir formation, when the water injection rate increases, a large amount of water will be produced from the oil well, which seriously affects the water flooding development effect. In order to improve the effect of water injection and the ultimate recovery of the oil field, the technology of water plugging and profile control of the oil layer has been paid attention to and developed in the development of oil and gas fields. The cross-linking agent can react with polyacrylamide polymers to obtain ge...

Claims

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Application Information

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IPC IPC(8): C09K8/502C09K8/512C08G8/10
CPCC08G8/10C09K8/502C09K8/512
Inventor 孙磊王宇宾张贵清徐鸿志宋有胜夏烨刘小攀
Owner BC P INC CHINA NAT PETROLEUM CORP
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