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Method for improving yield of low-permeability heavy oil well

A low-permeability, oil-well technology, applied in chemical instruments and methods, earth-moving drilling, wellbore/well components, etc., can solve the problems of large amount of chemical oil-displacing agent, poor effective utilization of thermal energy, and high steam cost. Improve porosity and permeability, which is beneficial to field promotion and application, and has strong pertinence and operability.

Active Publication Date: 2016-10-26
YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the steam stimulation technology has the following problems: (1) The cost of generating steam is high, especially in areas where water resources are scarce and expensive, and water treatment costs are high; (2) Due to steam injection, oil well heat loss, sand production Casing damage and other serious conditions affect the utilization rate of oil wells and the implementation of process measures; (3) With the increase of steam stimulation rounds, the water content in the near wellbore area rises, consuming most of the steam heat, and the degree of effective utilization of heat energy becomes lower. (4) Some heavy oil wells completed with non-thermal recovery cannot perform steam injection
The present invention has following shortcoming and deficiency: adopting single surface-active oil displacement agent can improve the oil washing efficiency of low-permeability reservoir, but can not effectively improve the swept volume of reservoir, therefore, has influenced enhanced oil recovery to a certain extent The degree of chemical flooding is large; the chemical flooding agent is used in a large amount, and the chemical oil flooding agent is expensive, resulting in a high investment cost of chemical flooding, so the input-output ratio is relatively low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Oil well D in an oil field 7 , reservoir temperature 83℃, permeability 42×10 -3 μm 2 , crude oil viscosity 3934mPa.s, oil layer thickness 4.5m, this well daily oil production 6.3t before the test, water cut 93.3%, utilize the method of the present invention in oil well D 7 To implement the field test, the specific implementation steps are as follows:

[0027] (1) Screening of oil wells

[0028] The selection criteria for oil wells are: reservoir temperature less than 90°C, permeability less than 50×10 -3 μm 2 , surface crude oil viscosity 7 The reservoir temperature is 83°C and the permeability is 42×10 -3 μm 2 , ground crude oil viscosity 3934mPa.s, oil layer thickness 4.5m, accord with the screening standard of oil well, can implement the present invention in this well.

[0029] (2) Fracturing of oil wells

[0030] The fracturing fluid for oil well fracturing is emulsified fracturing fluid, the number of fractures is 5, the length of the fracture is 20m, and t...

Embodiment 2

[0037] Oil well H in an oil field 2 , reservoir temperature 74℃, permeability 23×10 -3 μm2 , crude oil viscosity 4587mPa.s, oil layer thickness 2.8m, this well daily oil production 3.7t before the test, water cut 93.4%, utilize the method of the present invention in oil well H 2 To implement the field test, the specific implementation steps are as follows:

[0038] (1) Screening of oil wells

[0039] The selection criteria for oil wells are: reservoir temperature less than 90°C, permeability less than 50×10 -3 μm 2 , surface crude oil viscosity 2 The reservoir temperature is 74°C and the permeability is 23×10 -3 μm 2 , ground crude oil viscosity 4587mPa.s, oil layer thickness 2.8m, meet the screening standard of oil well, can implement the present invention in this well.

[0040] (2) Fracturing of oil wells

[0041] The fracturing fluid for oil well fracturing is foam fracturing fluid, the number of fractures is 3, the length of the fracture is 40m, and the width of the...

Embodiment 3

[0048] Oil well K in an oil field 11 , reservoir temperature 57℃, permeability 25×10 -3 μm 2 , crude oil viscosity 4207mPa.s, oil layer thickness 1.3m, this well daily oil production 2.6t before the test, water cut 95.2%, utilize the method of the present invention in oil well K 11 To implement the field test, the specific implementation steps are as follows:

[0049] (1) Screening of oil wells

[0050] The selection criteria for oil wells are: reservoir temperature less than 90°C, permeability less than 50×10 -3 μm 2 , surface crude oil viscosity 11 The reservoir temperature is 57°C and the permeability is 25×10 -3 μm 2 , ground crude oil viscosity 4207mPa.s, oil layer thickness 1.8m, accord with the screening standard of oil well, can implement the present invention in this well.

[0051] (2) Fracturing of oil wells

[0052] The fracturing fluid for oil well fracturing is emulsified fracturing fluid, the number of fractures is 2, the length of the fracture is 50m, an...

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Abstract

The invention belongs to the technical field of tertiary oil recovery, and particularly relates to a method for improving the yield of a low-permeability heavy oil well. Specifically, the method comprises the following steps of screening of the oil well, fracture of the oil well, single-well throughput treatment of the oil well, and treatment of a shaft of the oil well. The method has the characteristics of being simple in process and high in operability, and is beneficial for field application and popularization. The method is high in pertinence, a series of technical measures can be selected in a targeted mode according to the characteristics of the low-permeability heavy oil well, accordingly, the yield of the oil well can be greatly improved, the period of validity of the oil well can be greatly prolonged, the oil increase amount of the single well is higher than 1000 tons, the period of validity is longer than 3 years, and the input-output ratio is 1:5. Thus, the method can be widely applied to field tests for yield improvement of the low-permeability heavy oil well.

Description

technical field [0001] The invention belongs to the technical field of tertiary oil recovery, and in particular relates to a method for increasing the output of low-permeability heavy oil wells. Background technique [0002] Low permeability reservoirs with permeability lower than 10×10 -3 um 2 After entering the medium-high water-cut development period of the oilfield, how to improve the effect of water flooding, increase the production of a single well, stabilize oil and control water or increase oil and reduce water, and improve the recovery rate of reservoir water flooding have always been the research problems of oilfield development technicians . The existing water flooding development method for low permeability water flooding development reservoirs, the water flooding recovery rate is below 25%, and there are still a large amount of geological reserves that cannot be converted into crude oil production, resulting in a huge waste of oil resources. [0003] Due to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/16E21B43/22C09K8/594C09K8/584
CPCC09K8/584C09K8/594E21B43/16E21B43/164E21B43/26
Inventor 刘琴
Owner YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD
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