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A method for compound huff and puff of heavy oil well to increase single well production

A single well production, oil well technology, applied in wellbore/well parts, earthwork drilling, production fluid, etc., can solve the problems of high steam cost, high water treatment cost, rising water content near the wellbore, etc., to achieve pertinence and Strong operability, high input-output ratio, and wide application range

Active Publication Date: 2018-06-29
东营汇聚丰石油科技有限公司
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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

[0038] Oil well K in an oil field 2 , oil reservoir temperature 84℃, crude oil viscosity 4012mPa.s, formation water salinity 8793mg / L, permeability 380×10 -3 μm 2 , The thickness of the oil layer is 4.3m, the porosity is 0.316, and the well spacing is 135m. Before the test, the daily oil production of the well was 4.3t, and the daily liquid production was 120m 3 , water content 96.4%, utilize the method of the present invention in oil well K 2 To implement single well huff and puff field test, the specific implementation steps are as follows:

[0039] 1. Test oil well screening

[0040] Oil well screening criteria are oil reservoir temperature <90°C, crude oil viscosity <5000mPa.s, formation water salinity

[0041] 100×10 -3 μm 2 and oil layer thickness greater than 2m; oil well K 2 The reservoir temperature is 84°C, the viscosity of crude oil is 4012mPa.s, the salinity of formation water is 8793mg / L, and the permeability is 380×10 -3 μm 2 1. The thickness of oil laye...

Embodiment 2

[0054] Oil well L in an oil field 5 , oil reservoir temperature 73℃, crude oil viscosity 3896mPa.s, formation water salinity 9876mg / L, permeability 860×10 -3 μm 2 , The thickness of the oil layer is 2.3m, the porosity is 0.336, and the well spacing is 203m. Before the test, the daily oil production of the well was 6.5t, and the daily liquid production was 132m 3 , with a water content of 95.1%, using the method of the present invention in the oil well L 5 To implement single well huff and puff field test, the specific implementation steps are as follows:

[0055] 1. Test oil well screening

[0056] Oil well screening criteria are oil reservoir temperature <90°C, crude oil viscosity <5000mPa.s, formation water salinity

[0057] 100×10 -3 μm 2 and oil layer thickness greater than 2m; oil well L 7 The reservoir temperature is 73°C, the viscosity of crude oil is 3896mPa.s, the salinity of formation water is 9876mg / L, and the permeability is 860×10 -3 μm 2 1. The thickness...

Embodiment 3

[0070] Oil well R in an oil field 8 , reservoir temperature 55℃, crude oil viscosity 4238mPa.s, formation water salinity 15452mg / L, permeability 980×10 -3 μm 2 , The thickness of the oil layer is 3.6m, the porosity is 0.332, and the well spacing is 95m. Before the test, the daily oil production of the well was 3.5t, and the daily liquid production was 82m 3 , with a water content of 95.7%, using the method of the present invention in the oil well R 8 To implement single well huff and puff field test, the specific implementation steps are as follows:

[0071] 1. Test oil well screening

[0072] Oil well screening criteria are oil reservoir temperature <90°C, crude oil viscosity <5000mPa.s, formation water salinity

[0073] 100×10 -3 μm 2 and oil layer thickness greater than 2m; oil well N 10 Reservoir temperature 55°C, crude oil viscosity 4238mPa.s, formation water salinity 15452mg / L, permeability 980×10 -3 μm 2 1. The thickness of oil layer is 3.6m, which meets the sc...

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Abstract

The invention belongs to the technical field of tertiary oil recovery, and particularly relates to a thick oil well composite huff-puff method for increasing single well yield. The method specifically comprises the following steps: screening a test oil well, selecting a single well huff-puff technology, and carrying out test in the field. The thick oil well composite huff-puff method selects the single well huff-puff technology according to the characteristics of the thick oil well to reduce the oil-water mobility ratio well, thereby improving the single well yield of the thick oil well effectively; meanwhile, the thick oil well composite huff-puff method has the characteristics of being simple in technology, strong in operation capability and long in period of validity. Therefore, the method can be widely applied to the field test for increasing the single well yield of the thick oil well.

Description

technical field [0001] The invention relates to a method for tertiary oil recovery, in particular to a method for increasing the production of a single well through combined huff and puff of heavy oil wells. 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 techn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22
CPCE21B43/16
Inventor 孙伟董勇王艺兴冯业镇董亮亮刘凤强易凯杨丽丽王舒婉王永宁娄勇郭苏胜
Owner 东营汇聚丰石油科技有限公司
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