Cross-linking agent for profile control and oil displacement for high-temperature oil reservoir, as well as preparation method and application for same

A technology of cross-linking agent and high-temperature oil, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of large dosage, serious volatility of chemical agents, low response ability, etc., and achieve low irritating odor Effect

Inactive Publication Date: 2012-07-11
XINJIANG HUAYOU TECH SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the phenolic system can be used in high-temperature oil reservoir environment, due to the serious volatility of the chemical agent, it has a serious impact on the environment and operators, and the reaction ability is low, and the dosage is large. The national environmental protection department has clearly prohibited the use of phenolic in injection water. Therefore, there is a need for a cheap and non-toxic substitute product that can form a gel with good thermal stability and viscoelasticity that meets certain requirements with the copolymer to meet the requirements of high-temperature reservoir profile control and flooding

Method used

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  • Cross-linking agent for profile control and oil displacement for high-temperature oil reservoir, as well as preparation method and application for same
  • Cross-linking agent for profile control and oil displacement for high-temperature oil reservoir, as well as preparation method and application for same
  • Cross-linking agent for profile control and oil displacement for high-temperature oil reservoir, as well as preparation method and application for same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Synthesis of cross-linking agent for deep control and flooding in high temperature reservoirs

[0028] 1. Prepare raw materials according to the following weight ratio (×10kg)

[0029] Phenol 3, hexamethylenetetramine 2, formaldehyde 2, curing agent 2, catalyst 1

[0030] 2. Put the above raw materials into the reaction kettle together, mix well, heat and keep the temperature at 85±5°C, and carry out the polymerization reaction at this temperature.

[0031] 3. After reacting for 2.5 hours, cool the reaction mixture to room temperature (25°C) to obtain a prepolymer crosslinking agent (ie, a polyhydric phenolic crosslinking agent for high-temperature oil reservoir deep control and flooding).

[0032] 2. Preparation of high-temperature oil reservoir deep control and displacement agent

[0033] 1. Mix clean water and polyacrylamide evenly to prepare a polyacrylamide solution with a concentration of 1000mg / L, that is, add 1000mg of polyacrylamide to every 1L of clean wa...

Embodiment 2

[0038] 1. Synthesis of cross-linking agent for deep control and flooding in high temperature reservoirs

[0039] 1. Prepare raw materials according to the following weight ratio (×10kg)

[0040] Phenol 2.5, Hexamethylenetetramine 2.5, Formaldehyde 1.5, Curing Agent 1.5, Catalyst 1.75

[0041] 2. Put the above raw materials into the reaction kettle together, mix well, heat and keep the temperature at 95±5°C, and carry out the polymerization reaction at this temperature.

[0042] 3. After reacting for 2 hours, the reaction mixture was cooled down to room temperature (25°C) to obtain the product.

[0043] 2. Preparation of high-temperature oil reservoir deep control and displacement agent

[0044] 1. Mix clean water and polyacrylamide evenly to prepare a polyacrylamide solution with a concentration of 800mg / L, that is, add 800mg of polyacrylamide to every 1L of clean water, that is to say, every 1L of clean water contains polyacrylamide The weight is 800mg, and the molecular w...

Embodiment 3

[0048] 1. Synthesis of cross-linking agent for deep control and flooding in high temperature reservoirs

[0049] 1. Prepare raw materials according to the following weight ratio (×10kg)

[0050] Phenol 3.5, hexamethylenetetramine 1.5, formaldehyde 2.5, curing agent 2.5, catalyst 1.25

[0051] 2. Put the above raw materials into the reaction kettle together, mix well, heat and keep the temperature at 80±5°C, and carry out the polymerization reaction at this temperature.

[0052] 3. After reacting for 3 hours, cool the reaction mixture down to room temperature (25° C.) to obtain the product.

[0053] 2. Preparation of high-temperature oil reservoir deep control and displacement agent

[0054] 1. Mix clean water and polyacrylamide evenly, and prepare a polyacrylamide solution with a concentration of 1200mg / L, that is, add 1200mg of polyacrylamide per 1L of clean water, that is to say, every 1L of clean water contains polyacrylamide The weight is 1200mg, and the molecular weight ...

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Abstract

The invention discloses a cross-linking agent (i.e., polyhydroxy phenolic high-temperature prepolymer organic cross-linking agent) for deep profile control and oil displacement for a high-temperature oil reservoir, wherein the cross-linking agent disclosed by the invention is formed by using phenol, hexamethylenetetramine, formaldehyde and a curing agent as raw materials, and performing polymerization reaction under the action of a catalyst. The cross-linking agent is mainly researched and developed aiming at a high-temperature oil reservoir (at 70-125 DEG C), and is mainly used for the technologies of deep profile control and deep fluid diversion. In a high-temperature condition, the cross-linking agent is high in the activity of reaction with polyacrylamide, low in use concentration, non-toxic and odourless, harmless for environment and workers, and easy in operation. The cross-linking agent is used in deep profile control and oil displacement construction, and is widely applied in Turpan-Hami oilfield and Jilin oilfield, and the input-output ratio achieves 1: 3.6. Via continuing research in the aspects of improving understanding for oil reservoir, optimizing the working procedures of construction and pump injection program, and controlling injection radius, the cross-linking agent can be widely applied in the aspect of high-temperature oil reservoir.

Description

technical field [0001] The invention relates to an oilfield chemical agent and its preparation method and application, in particular to a high-temperature type crosslinking agent and its preparation method and application, belonging to the field of oilfield exploitation. Background technique [0002] In recent years, the deep control and flooding technology applied to medium and low temperature reservoirs (below 70°C) has developed rapidly and has been widely used in oilfields. However, the development of deep adjustment technology applied to high-temperature reservoirs (above 70°C) is relatively slow, mainly due to the slow development of high-temperature polymers and high-temperature cross-linking agents, which restrict the deep part of high-temperature reservoirs (above 70°C). Development of drive technology. At present, many oil fields still use the more toxic phenolic cross-linking agent in the 1950s and some less toxic alternatives. Although the phenolic system can b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/10C09K8/42C09K8/588
Inventor 李长根王毓贤朱全厚
Owner XINJIANG HUAYOU TECH SERVICE
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