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A kind of low dynamic depolymerization emulsification viscosity reducer for heavy oil cold recovery and preparation method thereof

An emulsified viscosity-reducing, low-power technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of no good emulsified viscosity-reducing agent system, etc., to achieve clean process, no pollution, strong operability, powerful effect

Active Publication Date: 2021-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the commonly used water-soluble viscosity reducing system is mainly used in strong dynamic environments such as wellbore lifting and pipeline transportation. There is no good emulsified viscosity reducing system for low dynamic environments under reservoir conditions.

Method used

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  • A kind of low dynamic depolymerization emulsification viscosity reducer for heavy oil cold recovery and preparation method thereof
  • A kind of low dynamic depolymerization emulsification viscosity reducer for heavy oil cold recovery and preparation method thereof
  • A kind of low dynamic depolymerization emulsification viscosity reducer for heavy oil cold recovery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Embodiment 1: Viscosity reducer D 1 and its preparation method

[0074] (1) Viscosity reducer D 1 The composition and its mass components are as follows:

[0075] Polyoxyethylene grafted polyacrylamide 0.1%;

[0076] Crown ether surfactant 40%;

[0077] Water 59.9%.

[0078] Described polyoxyethylene graft polyacrylamide, its molecular formula is as follows:

[0079]

[0080] Described crown ether surfactant, its general structural formula is as follows:

[0081]

[0082] where R is C 7 ~C 12 straight-chain alkyl groups.

[0083] (2) Viscosity reducer D 1 The preparation method is as follows:

[0084] ① First, weigh the crown ether surfactant and water, and stir for 10 minutes at a temperature of 30°C, a stirring rate of 100 rpm, and normal pressure to obtain a uniform and transparent aqueous solution;

[0085] ② Slowly add polyoxyethylene grafted polyacrylamide to the above aqueous solution, heat up to 60°C, stir at 300rpm for 1h, then cool to room tem...

Embodiment 2

[0086] Embodiment 2: Viscosity reducer D 2 and its preparation method

[0087] (1) Viscosity reducer D 2 The composition and its mass components are as follows:

[0088] Polyoxyethylene grafted polyacrylamide 1.0%;

[0089] Crown ether surfactant 45%;

[0090] Water 54%.

[0091] Described polyoxyethylene graft polyacrylamide, its molecular formula is as follows:

[0092]

[0093] Described crown ether surfactant, its general structural formula is as follows:

[0094]

[0095] (2) Viscosity reducer D 2 The preparation method is as follows:

[0096] ① First, weigh the crown ether surfactant and water, and stir for 12 minutes at a temperature of 32°C, a stirring rate of 120 rpm, and normal pressure to obtain a uniform and transparent aqueous solution;

[0097] ② Slowly add polyoxyethylene grafted polyacrylamide to the above aqueous solution, raise the temperature to 65°C, stir at 350rpm, and stir for 1.2h, then cool to room temperature to obtain the viscosity reduc...

Embodiment 3

[0098] Embodiment 3: Viscosity reducer D 3 and its preparation method

[0099] (1) Viscosity reducer D 3 The composition and its mass components are as follows:

[0100] Polyoxyethylene grafted polyacrylamide 2.5%;

[0101] Crown ether surfactant 52%;

[0102] Water 45.5%.

[0103] Described polyoxyethylene graft polyacrylamide, its molecular formula is as follows:

[0104]

[0105] Described crown ether surfactant, its general structural formula is as follows:

[0106]

[0107] where R is C 7 ~C 12 of alkylamides.

[0108] (2) Viscosity reducer D 3 The preparation method is as follows:

[0109] ① First, weigh the crown ether surfactant and water, and stir for 13 minutes at a temperature of 35°C, a stirring rate of 200 rpm, and normal pressure to obtain a uniform and transparent aqueous solution;

[0110] ② Slowly add polyoxyethylene grafted polyacrylamide to the above aqueous solution, raise the temperature to 62°C, stir at 320rpm, and stir for 1.5h, then coo...

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Abstract

The invention discloses a viscosity reducer used in heavy oil exploitation, in particular to a low power depolymerization emulsification viscosity reducer used in heavy oil cold recovery and a preparation method thereof. The viscosity reducer consists of 0.1-10 wt% poly It is prepared by compounding ethylene oxide grafted polyacrylamide, 40-60wt% crown ether surfactant and the rest water. The viscosity reducer has a strong ability to depolymerize and emulsify heavy oil under low dynamic conditions, and can make the viscosity exceed 10000mPa when the rotation speed is lower than 50rpm, the use concentration is lower than 0.1wt%, the temperature is 50°C and the stirring time is lower than 1min. The viscosity of s heavy oil can be reduced by more than 99.0%; the viscosity of heavy oil with a viscosity of 5000-10000mPa·s can be reduced by more than 98.0%; the viscosity of heavy oil with a viscosity of 1000-5000mPa·s can be reduced by more than 95%. It is difficult for conventional emulsifiers to emulsify heavy oil under seepage dynamics under reservoir conditions.

Description

technical field [0001] The invention relates to a viscosity reducer used in the process of heavy oil exploitation, in particular to a viscosity reducer capable of depolymerizing and emulsifying heavy oil under low power conditions and a preparation method thereof. Background technique [0002] Heavy oil resources account for a considerable proportion of the world's oil and gas resources. According to statistics, the reserves of heavy oil, super heavy oil and natural bitumen in the world are about 100 billion tons. Big countries rich in heavy oil resources include Canada, Venezuela, the United States, China, Indonesia, etc. Their geological reserves of heavy oil and tar sand resources are about 400-600 billion tons, and their annual output of heavy oil is as high as 127 million tons. [0003] The solid components in heavy oil are mainly paraffin, asphaltenes and colloids. When the concentration of these solid substances in crude oil is relatively large, the crude oil has obv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584C09K8/588C09K8/60C09K8/88
CPCC09K8/584C09K8/588C09K8/602C09K8/88
Inventor 张宗檩汪庐山郑万刚谢志勤于田田杨斌张学超何旭张岩王志敏
Owner CHINA PETROLEUM & CHEM CORP