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Low-cost environment-friendly oil-soluble viscosity reducing agent for super heavy oil

An oil-soluble, viscosity-reducing agent technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of affecting the effect of dilution, uneven mixing, and increased demand for dilution, and achieves a huge environmental impact. Benefits, thin oil saving rate, and wide application range

Active Publication Date: 2012-07-18
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are the following problems in the blending of thin oil: (1) Insufficient resources for blending thin oil; (2) As the water cut in the oil well rises, the mixing is uneven, which affects the effect of blending and thinning, and the demand for blending amount increases
The application of oil-soluble viscosity reducers in oil production processes is mostly limited to laboratory research and field tests, and the viscosity reduction effect is not significant, and the production cost of viscosity reduction is high

Method used

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  • Low-cost environment-friendly oil-soluble viscosity reducing agent for super heavy oil

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] Example 1 oil-soluble viscosity reducer

[0021] Raw material composition:

[0022] Main ingredient 30%

[0023] Azobisisobutyronitrile (initiator) 0.5%

[0024] Toluene (solvent) 69.5%;

[0025] Wherein, the above-mentioned main ingredients are waste oil, styrene and maleic anhydride in a mass ratio of 3:1:1.

[0026] Preparation:

[0027] First fully dissolve the maleic anhydride with toluene at room temperature, then add waste oil, styrenebutene in turn, and then add the initiator azobisisobutyronitrile, and continuously stir the reaction at 80°C, normal pressure, and nitrogen protection 3 hours, obtain the oil-soluble viscosity reducer among the present invention.

example 2

[0028] Example 2 oil-soluble viscosity reducer

[0029] composition:

[0030] Main ingredient 37%

[0031] Azobisisobutyronitrile 0.3%

[0032] Diesel (solvent) 62.7%;

[0033] Wherein, the above-mentioned main ingredients are waste oil, styrene and maleic anhydride in a mass ratio of 3:2:2.

[0034] Preparation:

[0035] First, fully dissolve maleic anhydride with diesel oil at room temperature, then add waste oil, styrene in sequence, and then add initiator azobisisobutyronitrile, and continuously stir and react at 80°C, under normal pressure, under nitrogen protection, for 3 Hour, obtain the oil-soluble viscosity reducer among the present invention.

example 3

[0036] Application of Example 3 in Thick Oil Viscosity Reduction in TH12126 Well of Tahe Oilfield

[0037] Tahe TH12126 heavy oil can flow when the formation temperature is 140°C, but not flow at room temperature, and the viscosity is 89×10 at 50°C. 4 mPa s. After adding the viscosity reducer prepared in Example 1 with a mass fraction of 1% of the system, the viscosity of the system at 50°C was 7650 mPa·s, and the viscosity reduction rate was 99.14%.

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Abstract

The invention provides a low-cost environment-friendly oil-soluble viscosity reducing agent for super heavy oil, which is prepared from the following raw materials by mass: 20-65% of a main agent, 35-80% of a solvent and 0.05-1% of an initiator, wherein the main agent is composed of gutter oil, aromatic hydrocarbons and alkenes containing anhydrides at a mass ratio of 3:1:(1-3):3:3. The oil-soluble viscosity reducing agent provided by the invention utilizes environmental waste (gutter oil) to reduce production cost and realizing the full utilization of waste resources, can greatly reduce the viscosity of super heavy oil, saves the use amount of thin oil, and meets the requirements of heavy oil recovery.

Description

technical field [0001] The invention relates to the field of crude oil exploitation, in particular to a low-cost, environment-friendly oil-soluble viscosity reducer used for wellbore viscosity reduction in heavy oil / ultra-heavy oil production and pipeline transportation, with an international classification number of C10M or C10G. Background technique [0002] The viscosity at the oil layer temperature is greater than 5×10 4 The degassed crude oil of mPa·s is called super heavy oil. my country has abundant super-heavy oil reserves, and the super-heavy oil reserves in Tahe Oilfield alone account for about 40% of my country's total heavy oil reserves. [0003] For a long time, three methods have been used in the production of ultra-heavy oil at home and abroad: heating, emulsification, and blending to reduce viscosity. Among them, the energy consumption of heating viscosity reduction is too high, and it also brings certain environmental pollution; emulsification viscosity re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524
Inventor 郭继香陈朝刚安娜于欣
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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