Method for improving recovery ratio of high pour point oil reservoir

A technology of high pour point oil and recovery factor, applied in chemical instruments and methods, production fluids, earthwork drilling, etc., can solve the problems of unmentioned, hidden danger of explosion, etc., to improve the flow performance, improve the validity period, and reduce the investment cost effect

Inactive Publication Date: 2020-02-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that since the vertical distance between the vertical gas injection well and the horizontal production well is only 5-10 meters, high-temperature air and combustion fronts can easily enter the horizontal production well at the bottom of the gas injection well during the field implementation process, thereby There is a serious explosion hazard problem, and the application does not mention what operational measures to avoid the safety hazard problem

Method used

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  • Method for improving recovery ratio of high pour point oil reservoir
  • Method for improving recovery ratio of high pour point oil reservoir
  • Method for improving recovery ratio of high pour point oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Test reservoir D of an oil production plant in Shengli Oilfield 12 General situation: Reservoir temperature is 75°C, salinity of formation water is 25682mg / L, viscosity of crude oil is 160mPa.s, freezing point is 45°C, wax content is 35.2%, permeability is 1200×10 -3 μm 2 , the comprehensive water cut of the reservoir is 95.2%, and the geological reserves are 3.5×10 6 t. Utilize the method of the present invention to improve the recovery factor of this block, concrete steps are as follows:

[0040] (1) Screening of test reservoirs

[0041]Test reservoir D 12 The temperature is 75°C, the salinity of formation water is 25682mg / L, the viscosity of crude oil is 160mPa.s, the freezing point is 45°C, and the wax content is 35.2%. The screening criteria of the test reservoirs of the present invention are met, so the present invention can be practiced.

[0042] (2) Screening of chemical pour point depressants

[0043] The screening of chemical pour point depressants incl...

Embodiment 2

[0074] Test reservoir E of an oil production plant in Shengli Oilfield 21 General situation: Reservoir temperature is 70°C, salinity of formation water is 18623mg / L, viscosity of crude oil is 220mPa.s, freezing point is 48°C, wax content is 38.5%, permeability is 1500×10 -3 μm 2 , the comprehensive water cut of the reservoir is 97.3%, and the geological reserves are 3.2×10 6 t. Utilize the method of the present invention to improve the recovery factor of this block, concrete steps are as follows:

[0075] (1) Screening of test reservoirs

[0076] Test reservoir E 21 The temperature is 70°C, the salinity of formation water is 18623mg / L, the viscosity of crude oil is 220mPa.s, the freezing point is 48°C, and the wax content is 38.5%. The screening criteria of the test reservoirs of the present invention are met, so the present invention can be practiced.

[0077] (2) Screening of chemical pour point depressants

[0078] The screening of chemical pour point depressants inc...

Embodiment 3

[0110] Test reservoir D of an oil production plant in Shengli Oilfield 15 General situation: Reservoir temperature is 65°C, salinity of formation water is 32567mg / L, viscosity of crude oil is 483mPa.s, freezing point is 48°C, wax content is 38.8%, permeability is 1100×10 -3 μm 2 , the comprehensive water cut of the reservoir is 98.0%, and the geological reserves are 7.5×10 6 t. Utilize the method of the present invention to improve the recovery factor of this block, concrete steps are as follows:

[0111] (1) Screening of test reservoirs

[0112] Test reservoir D 15 The temperature is 65°C, the salinity of formation water is 32567mg / L, the viscosity of crude oil is 483mPa.s, the freezing point is 48°C, and the wax content is 38.8%. The screening criteria of the test reservoirs of the present invention are met, so the present invention can be practiced.

[0113] (2) Screening of chemical pour point depressants

[0114] The screening of chemical pour point depressants inc...

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Abstract

The invention belongs to the technical field of oil field development, and particularly relates to a method for improving the recovery ratio of a high pour point oil reservoir. The method specificallyincludes the following steps that test reservoirs are screened; a chemical pour point depressant is screened; an activating agent is screened; the chemical pour point depressant and the activating agent are compounded to form a compounding system; the compatibility of the compounding system is evaluated; the injection volume of the compounding system is optimized; and field testing and evaluationof effects are performed. The method effectively combines the chemical pour point depression with microbial pour point depression, and has the advantages of low cost, the quick effect, the long validity period, the high input-output ratio and the good pour point depression effect, the input-output ratio is greater than 1:10, the recovery ratio is increased by 15% or above through the field test,and therefore, the method can be widely used in a production process of the high pour point oil reservoir.

Description

technical field [0001] The invention belongs to the technical field of oil field development, and in particular relates to a method for increasing oil recovery in high pour point oil reservoirs. Background technique [0002] High pour point oil reservoirs are widely distributed in the world, and China is one of the countries with the most abundant high pour point oil resources. It is known that the high pour point oil resources in China can reach 50×10 8 Tons or more, accounting for 30-40% of the world's high pour point oil resources. The properties of crude oil in high pour point oil reservoirs have the characteristics of "three highs", that is, high wax content, high freezing point, and high wax precipitation point. The wax content ranges from 10% to 57%, generally 20% to 40%; the freezing point is generally 25 to 59 degrees Celsius, and the highest is 67 degrees Celsius; the wax precipitation point is generally 40 to 74 degrees Celsius. [0003] At present, more than 80...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22C09K8/582C09K8/588C09K8/584
CPCC09K8/582C09K8/584C09K8/588E21B43/16
Inventor 钱钦吴晓玲孙磉礅林军章孙刚正高光军胡婧刘涛李彩风曹嫣镔
Owner CHINA PETROLEUM & CHEM CORP
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