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PetroChina is developing a macromolecular viscosity reducer that can reduce the viscosity of heavy oil and increase the viscosity of the displacement fluid
.
This is the information obtained by the reporter from the expert demonstration meeting on the topic design of major scientific and technological projects in the 13th Five-Year Plan held by the Science and Technology Management Department of PetroChina in mid-March
.
???? It is understood that PetroChina has rich heavy oil resources in Xinjiang, Liaohe, Dagang and Tuha oil fields, accounting for about 20% of the total oil resources
.
The development methods of heavy oil include thermal recovery and water flooding.
The water flooding ordinary heavy oil reserves account for 30.
1% of the total heavy oil reserves, and the output has increased year by year, and currently accounts for 18% of the company's heavy oil output
.
Due to the high viscosity of heavy oil and serious reservoir heterogeneity, ordinary heavy oil water flooding has entered a stage of high water cut and high decline, and the recovery rate of water flooding is only 5%-25%
.
??? Macromolecular viscosity reducer can have a strong solubilization, dispersion and viscosity reduction effect on heavy oil (displaced phase) at low formation shear rate, and at the same time have a viscosity-increasing effect on water (displacement medium) , The two work together to further expand the affected volume and improve the development effect
.
????? In order to improve the recovery of heavy oil water flooding, scholars at home and abroad have done a lot of work, including alkaline flooding, polymer flooding, surfactant flooding, combination flooding and gas flooding.
Laboratory research has achieved certain results.
The technology was tested in the field
.
However, there are still many problems with viscosity reducers used in heavy oil water flooding to enhance oil recovery.
For example, it is difficult to form O/W (oil-in-water) emulsions to achieve viscosity reduction under the condition of low shear strength of formation; (displacing medium) no increase in viscosity (swept volume expansion) and the like
.
The research team with PetroChina Exploration and Development Research Institute as the main force intends to focus on the dispersion and viscosity reduction mechanism of macromolecular viscosity reducers for heavy oil water flooding, and the synthesis and evaluation of macromolecular viscosity reducers
.
.
This is the information obtained by the reporter from the expert demonstration meeting on the topic design of major scientific and technological projects in the 13th Five-Year Plan held by the Science and Technology Management Department of PetroChina in mid-March
.
???? It is understood that PetroChina has rich heavy oil resources in Xinjiang, Liaohe, Dagang and Tuha oil fields, accounting for about 20% of the total oil resources
.
The development methods of heavy oil include thermal recovery and water flooding.
The water flooding ordinary heavy oil reserves account for 30.
1% of the total heavy oil reserves, and the output has increased year by year, and currently accounts for 18% of the company's heavy oil output
.
Due to the high viscosity of heavy oil and serious reservoir heterogeneity, ordinary heavy oil water flooding has entered a stage of high water cut and high decline, and the recovery rate of water flooding is only 5%-25%
.
??? Macromolecular viscosity reducer can have a strong solubilization, dispersion and viscosity reduction effect on heavy oil (displaced phase) at low formation shear rate, and at the same time have a viscosity-increasing effect on water (displacement medium) , The two work together to further expand the affected volume and improve the development effect
.
????? In order to improve the recovery of heavy oil water flooding, scholars at home and abroad have done a lot of work, including alkaline flooding, polymer flooding, surfactant flooding, combination flooding and gas flooding.
Laboratory research has achieved certain results.
The technology was tested in the field
.
However, there are still many problems with viscosity reducers used in heavy oil water flooding to enhance oil recovery.
For example, it is difficult to form O/W (oil-in-water) emulsions to achieve viscosity reduction under the condition of low shear strength of formation; (displacing medium) no increase in viscosity (swept volume expansion) and the like
.
The research team with PetroChina Exploration and Development Research Institute as the main force intends to focus on the dispersion and viscosity reduction mechanism of macromolecular viscosity reducers for heavy oil water flooding, and the synthesis and evaluation of macromolecular viscosity reducers
.