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Self-generated heat chemical temperature raising agent for acidic heavy oil reservoir and its application method

A heavy oil reservoir, self-generated heat technology, applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the problem of difficult to achieve self-generated heat and temperature increase of porous media in the reservoir, and achieve good carrying injection effect and heat generation efficiency. High, high heat release efficiency

Active Publication Date: 2016-08-24
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, self-generated heat systems widely used in oilfields include nitrite and ammonium salt heat-generated systems, H 2 o 2 Heat generation system and polyhydroxy aldehyde oxidation heat generation system are mostly used in fracturing fluid, wellbore heat generation and wax removal due to their heat release efficiency, injection safety and stability. self-generated heat

Method used

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  • Self-generated heat chemical temperature raising agent for acidic heavy oil reservoir and its application method

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Effect test

Embodiment 1

[0037] The self-generated heat chemical warming agent for acid heavy oil reservoirs in this embodiment includes a heat generating agent and a triggering agent, and the heat generating agent includes magnesium powder with a particle size of not more than 400 meshes and a coating layer for wrapping the magnesium powder , the triggering agent is a particle size not greater than 400 mesh P 2 O 5 Powder, Magnesium Powder and P 2 O 5 The mass ratio of the powder is 1:1.0, and the coating layer is a paraffin coating layer or a magnesium stearate coating layer.

[0038] When the coating layer is a paraffin coating layer, the preparation method of the heat generating agent comprises the following steps:

[0039] Step 1. Under the stirring condition of 65°C, add paraffin into cyclohexane until it is completely melted to obtain a coating solution with a paraffin mass concentration of 20%. The magnesium powder was added to the coating solution at a ratio of 4:1, and dispersed at a con...

Embodiment 2

[0052] The self-generated heat chemical warming agent for acid heavy oil reservoirs in this embodiment includes a heat generating agent and a triggering agent, and the heat generating agent includes magnesium powder with a particle size of not more than 400 meshes and a coating layer for wrapping the magnesium powder , the triggering agent is a particle size not greater than 400 mesh P 2 O 5 Powder, Magnesium Powder and P 2 O 5 The mass ratio of the powder is 1:2.0, and the coating is a paraffin coating or a magnesium stearate coating;

[0053] When the coating layer is a paraffin coating layer, the preparation method of the heat generating agent comprises the following steps:

[0054] Step 1. Under the stirring condition of 70°C, add the paraffin into the cyclohexane until it is completely melted to obtain a coating solution with a paraffin mass concentration of 40%. The magnesium powder was added to the coating solution at a ratio of 6:1, and dispersed at a constant temp...

Embodiment 3

[0067] The self-generated heat chemical warming agent for acid heavy oil reservoirs in this embodiment includes a heat generating agent and a triggering agent, and the heat generating agent includes magnesium powder with a particle size of not more than 400 meshes and a coating layer for wrapping the magnesium powder , the triggering agent is a particle size not greater than 400 mesh P 2 O 5 Powder, Magnesium Powder and P 2 O 5 The mass ratio of the powder is 1:1.5, and the coating is a paraffin coating or a magnesium stearate coating;

[0068] When the coating layer is a paraffin coating layer, the preparation method of the heat generating agent comprises the following steps:

[0069] Step 1. Under the stirring condition of 68°C, add the paraffin into the cyclohexane until it is completely melted to obtain a coating solution with a paraffin mass concentration of 25%. The magnesium powder was added to the coating solution in a ratio of 5:1, and dispersed at a constant temp...

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Abstract

The invention discloses a self thermogenesis chemical temperature raising agent for an acid thick oil reservoir. The agent comprises a thermogenesis agent and a triggering agent, wherein the thermogenesis agent comprises magnesium powder with the granularity of not more than 400 meshes, and a coating layer for coating the magnesium powder, the triggering agent is P2O5 powder with the granularity of not more than 400 meshes, the mass ratio of the magnesium powder to the P2O5 powder is 1 to (1.0-2.0), and the coating layer is a paraffin coating layer or a magnesium stearate coating layer. In addition, the invention also discloses a use method of the self thermogenesis chemical temperature raising agent. The self thermogenesis chemical temperature raising agent has the advantages of high thermogenesis efficiency, safe and reliable transport reservoir and injection process, rapid thermosensitivity triggering, good carrying injection effect and the like, is applicable to self thermogenesis temperature raising synergia development of the interior of the acid thick oil reservoir, and is applicable to the thick oil reservoir with the permeability of greater than 500*10<-3>mu m<2> and the oil reservoir temperature of greater than 60 DEG C.

Description

technical field [0001] The invention belongs to the technical field of self-generated heat and efficiency-enhancing development in an acidic heavy oil reservoir, and particularly relates to a self-generated thermal chemical warming agent used in an acidic heavy oil reservoir and a method for using the same. Background technique [0002] Abundant development of heavy oil resources is of great significance. A notable feature of heavy oil reservoirs is that under formation conditions, heavy oil has high viscosity, high relative density and poor flow ability, so it is difficult to develop economically and effectively with conventional techniques. However, the viscosity of heavy oil is very sensitive to temperature, that is, the temperature increases and decreases greatly, and the higher the viscosity, the greater the decrease. At this time, the heavy oil tends to be a Newtonian fluid when it flows, which is an important thermophysical property of heavy oil. , is also the basic b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/592
CPCC09K8/592
Inventor 刘静蒲春生尉雪梅吴飞鹏
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)