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A technology for increasing production of low-permeability heavy oil wells

A low-permeability, oil-well technology, applied in the direction of wellbore/well components, drilling composition, production fluid, etc., can solve the problems of large amount of chemical oil displacement agent, high cost of steam, and poor utilization of heat energy, etc. Achieve the effects of improving porosity and permeability, strong pertinence and operability, and conducive to field promotion and application

Active Publication Date: 2018-04-17
大庆三采技术有限公司
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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

[0025] Oil well C in an oil field 5 , reservoir temperature 83℃, permeability 40×10 -3 μm 2 , crude oil viscosity 4456mPa.s, oil layer thickness 5.2m, this well daily oil production 2.8t before the test, water cut 96.4%, utilize the method of the present invention in oil well C 5 To implement the field test, the specific implementation steps are as follows:

[0026] (1) Screening of oil wells

[0027] 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 5 The reservoir temperature is 83°C and the permeability is 40×10 -3 μm 2 , ground crude oil viscosity 4456mPa.s, oil layer thickness 5.2m, accord with the screening standard of oil well, can implement the present invention in this well.

[0028] (2) Fracturing of oil wells

[0029] The fracturing fluid is oil-based fracturing fluid, the number of fractures is 6, the length of the fracture is 20m, and the width of the fracture ...

Embodiment 2

[0036] Oil well D in an oil field 13 , reservoir temperature 75℃, permeability 32×10 -3 μm 2 , crude oil viscosity 4860mPa.s, oil layer thickness 2.3m, this well daily oil production 3.1t before the test, water cut 95.3%, utilize the method of the present invention in oil well D 13 To implement the field test, the specific implementation steps are as follows:

[0037] (1) Screening of oil wells

[0038] 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 13 The reservoir temperature is 75°C and the permeability is 32×10 -3 μm 2 , ground crude oil viscosity 4860mPa.s, oil layer thickness 2.3m, accord with the screening standard of oil well, can implement the present invention in this well.

[0039] (2) Fracturing of oil wells

[0040] The fracturing fluid is oil-based fracturing fluid, the number of fractures is 3, the length of the fracture is 40m, and the width of the fracture...

Embodiment 3

[0047] Oil well G in an oil field 3 , reservoir temperature 56℃, permeability 28×10 -3 μm 2 , crude oil viscosity 4132mPa.s, oil layer thickness 1.5m, this well daily oil production 2.7t before the test, water cut 91.5%, utilize the method of the present invention in oil well G 3 To implement the field test, the specific implementation steps are as follows:

[0048] (1) Screening of oil wells

[0049] 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 3 The reservoir temperature is 56°C and the permeability is 28×10 -3 μm 2 , ground crude oil viscosity 4132mPa.s, oil layer thickness 1.5m, accord with the screening standard of oil well, can implement the present invention in this well.

[0050] (2) Fracturing of oil wells

[0051] The fracturing fluid is oil-based fracturing fluid, the number of fractures is 1, the length of the fracture is 50m, and the width of the fracture ...

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Abstract

The invention belongs to the technical field of tertiary oil recovery, and particularly relates to a technology for increasing yield of a low-permeability heavy oil well. The technology specifically comprises the following steps: screening the oil well; fracturing the oil well; treating single well huff and puff of the oil well; and treating a shaft of the oil well. The technology has the features of simplicity and high operability, and facilitates field popularization and application; and the technology is high in pertinency, a series of technology measures are selected in a targeted manner according to the features of the low-permeability heavy oil well, therefore, the yield of the oil well can be greatly improved, the period of validity of the oil well can be greatly prolonged, single well oil increment is greater than 1,000 t, the period of validity is longer than 3 years, and the input-output ratio is greater than 1:5. Therefore, the technology can be widely used in a field test for increasing the yield 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 process for increasing production 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 has always been a research problem for 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 the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B43/22C09K8/584C09K8/594
CPCC09K8/584C09K8/594E21B43/16E21B43/26
Inventor 冀延民王建刘红芬韩荣华李静王峰李英井珊珊王彦磊吴大伟
Owner 大庆三采技术有限公司
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