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A single well huff and puff increase production method for heavy oil wells

A technology for oil wells and oil layers, which is applied in the field of single-well huff and puff stimulation of heavy oil wells, can solve the problems of high steam cost, high water treatment cost, rising water content in the near-well area, etc., and achieves high pertinence and operability. High and wide range of effects

Active Publication Date: 2018-06-29
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 huff and puff 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, which consumes most of the steam heat, and the degree of effective utilization of heat energy becomes smaller. (4) Some heavy oil wells completed without thermal recovery cannot inject steam

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Oil well E in an oil field 5 , reservoir temperature 85℃, crude oil viscosity 3650mPa.s, formation water salinity 13450mg / L, permeability 450×10 -3 μm 2 , The thickness of the oil layer is 3.2m, the porosity is 0.323, and the well spacing is 100m. Before the test, the daily oil production of the well is 4.0t, and the daily liquid production is 150m 3 , with a water content of 97.3%, using the method of the present invention in oil well E 5 To implement single well huff and puff field test, the specific implementation steps are as follows:

[0038] 1. Test oil well screening

[0039] Oil well screening criteria are oil reservoir temperature <90°C, crude oil viscosity <5000mPa.s, formation water salinity

[0040] 100×10 -3 μm 2 , oil layer thickness greater than 2m; oil well E 5 The reservoir temperature is 85°C, the viscosity of crude oil is 3650mPa.s, the salinity of formation water is 13450mg / L, and the permeability is 450×10 -3 μm 2 1. The thickness of oil la...

Embodiment 2

[0052] Oil well L in an oil field 7 , reservoir temperature 70℃, crude oil viscosity 3560mPa.s, formation water salinity 5872mg / L, permeability 680×10 -3 μm 2 , The thickness of the oil layer is 2.8m, the porosity is 0.345, and the well spacing is 125m. Before the test, the daily oil production of the well was 6.2t, and the daily liquid production was 125m 3 , with a water content of 95.0%, using the method of the present invention in the oil well L 7 To implement single well huff and puff field test, the specific implementation steps are as follows:

[0053] 1. Test oil well screening

[0054] Oil well screening criteria are oil well temperature <90°C, crude oil viscosity <5000mPa.s, formation water salinity

[0055] 100×10 -3 μm 2 , oil layer thickness greater than 2m; oil well L 7 The reservoir temperature is 70°C, the viscosity of crude oil is 3560mPa.s, the salinity of formation water is 5872mg / L, and the permeability is 680×10 -3 μm 2 1. The thickness of oil lay...

Embodiment 3

[0067] Oil well N in an oil field 10 , reservoir temperature 62℃, crude oil viscosity 4025mPa.s, formation water salinity 10236mg / L, permeability 560×10 -3 μm 2 , The thickness of the oil layer is 3.5m, the porosity is 0.335, and the well spacing is 120m. Before the test, the daily oil production of the well was 4.2t, and the daily liquid production was 86m 3 , with a water content of 95.1%, using the method of the present invention in the oil well N 10 To implement single well huff and puff field test, the specific implementation steps are as follows:

[0068] 1. Test oil well screening

[0069] Oil well screening criteria are oil well temperature <90°C, crude oil viscosity <5000mPa.s, formation water salinity

[0070] 100×10 -3 μm 2 , oil layer thickness greater than 2m; oil well N 10 Reservoir temperature is 62°C, crude oil viscosity is 4025mPa.s, formation water salinity is 10236mg / L, permeability is 560×10 -3 μm 2 1. The thickness of oil layer is 3.5m, which meet...

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Abstract

The invention belongs to the technical field of tertiary oil production, and particularly relates to a heavy oil well single-well throughput yield increase method. The method concretely comprises the following steps of test oil well screening, single-well throughput process selection and field test. The single-well throughput process is selected by aiming at the characteristics of a heavy oil well; and the oil-water mobility ratio is well reduced, so that the single-well yield of the heavy oil well can be effectively improved. Meanwhile, the heavy oil well single-well throughput yield increase method has the characteristics of simple process, high operability and long validity period. Therefore the method can be widely applied to the field test for improving the single-well yield of the heavy oil well.

Description

technical field [0001] The invention relates to a method for tertiary oil recovery, in particular to a method for increasing production by huffing and puffing of a heavy oil well. Background technique [0002] my country's onshore heavy oil resources account for more than 20% of the total petroleum resources. The national heavy oil resources are about 19.87 billion tons, and the proven geological reserves of heavy oil are about 2.06 billion tons. The crude oil production of heavy oil reservoirs has reached 7% of the total crude oil production, and the development of heavy oil has become an important part of crude oil production in my country. And with the reduction of light oil production reserves, the proportion of heavy oil production will continue to increase. [0003] Due to the high content of asphalt colloid and low wax content, heavy oil has high viscosity, difficult flow, and great difficulty in mining. At present, steam stimulation technology is the main method of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24E21B43/16E21B43/22C09K8/584
CPCC09K8/584E21B43/16E21B43/24
Inventor 王继国刘雁琳肖春香熊玉刚姚征万国芳李婷婷王蓓唐蕾蕾段炜王会丽
Owner YANTAI ZHIBEN INTPROP OPERATIONS MANAGEMENT CO LTD
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