Microorganism single well treating method for heavy oil well

A well treatment and microbial technology, applied in the field of microbial single well treatment of heavy oil wells, can solve the problems of high steam cost, small reservoir adaptability, high water treatment cost, etc., achieve pertinence and operability, and reservoir application range Wide, high input-output ratio effect

Inactive Publication Date: 2017-06-30
CHINA PETROLEUM & CHEM CORP +1
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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) steam injection causes heat loss in oil wells, sand production, Casing damage and other serious conditions affect the utilization rate of oil wells and the implementation of technological measures; (3) With the increase of steam stimulation rounds, the water content in the near-wellbore area increases, consuming most of the steam heat, and the effective utilization of heat energy becomes worse , leading to poor steam huff and puff effect; (4) Some heavy oil wells completed with non-thermal recovery cannot perform steam huff and puff
The shortcoming of this invention is, (1) the scope of adaptation of oil reservoir is less, and this method is not suitable for crude oil viscosity and surpasses 5000mPa.s, the heavy oil well that salinity exceeds 50000mg / L; The effect of heavy oil is better, but the effect on the wellbore of oil well is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] CD of heavy oil well in a certain block of Shengli Oilfield 21 , reservoir temperature 80℃, crude oil viscosity 7256mPa.s, formation water salinity 12560mg / L, permeability 850×10 -3 μm 2 , The thickness of the oil layer is 6.0m, the porosity is 0.402, before the test, the daily oil production of the well is 5.44t, and the daily liquid production is 80m 3 , water content 93.2%, utilize the method of the present invention to implement field test in this heavy oil well, concrete implementation steps are as follows:

[0046] 1. Test oil well screening

[0047] The screening criteria for heavy oil wells are reservoir temperature 200×10 -3 μm 2 , The thickness of the oil layer is greater than 5m, and the daily fluid production is greater than 10m 3 , The water content of the produced fluid is lower than 95%; heavy oil well CD 21 The reservoir temperature is 80°C, the viscosity of crude oil is 7256mPa.s, the salinity of formation water is 12560mg / L, and the permeability is...

Embodiment 2

[0062] Heavy oil well L in a block of Shengli Oilfield 2 , reservoir temperature 72°C, crude oil viscosity 5892mPa.s, formation water salinity 25853mg / L, permeability 700×10 -3 μm 2 , The thickness of the oil layer is 10.5m, the porosity is 0.412, the daily oil production of the well before the test is 2.9t, and the daily liquid production is 50m 3 , with a water content of 94.2%, using the method of the present invention in the oil well L 2 To implement the field test, the specific implementation steps are as follows:

[0063] 1. Test oil well screening

[0064] The screening criteria for heavy oil wells are reservoir temperature 200×10 -3 μm 2 , The thickness of the oil layer is greater than 5m, and the daily fluid production is greater than 10m 3 , The water content of the produced fluid is lower than 95%; heavy oil well L 2 The reservoir temperature is 72°C, the viscosity of crude oil is 5892mPa.s, the salinity of formation water is 25853mg / L, and the permeability i...

Embodiment 3

[0079] Heavy oil well M in a block of Shengli Oilfield 15 , reservoir temperature 68℃, crude oil viscosity 6583mPa.s, formation water salinity 75625mg / L, permeability 1100×10 -3 μm 2 , The thickness of the oil layer is 7.2m, and the porosity is 0.450. Before the test, the daily oil production of the well was 6.6t, and the daily liquid production was 120m 3 , with a water content of 94.5%, using the method of the present invention in the heavy oil well M 15 To implement the field test, the specific implementation steps are as follows:

[0080] 1. Test oil well screening

[0081] The screening criteria for heavy oil wells are reservoir temperature 200×10 -3 μm 2 , The thickness of the oil layer is greater than 5m, and the daily fluid production is greater than 10m 3 , The water content of the produced fluid is lower than 95%; heavy oil well M 15 The reservoir temperature is 68°C, the viscosity of crude oil is 6583mPa.s, the salinity of formation water is 75625mg / L, and th...

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PUM

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Abstract

The invention belongs to the technical field of tertiary oil recovery, and specifically relates to a method for microbial single well treatment of heavy oil wells. The method specifically includes the following steps: screening of heavy oil wells; single well huff and puff treatment of heavy oil wells; Evaluation. According to the characteristics of heavy oil wells, the present invention selects the comprehensive process of huff and puff and wellbore treatment, which can significantly reduce the oil-water mobility ratio in the oil layer of heavy oil wells and significantly improve the flow performance of wellbore crude oil, thereby greatly increasing the production of heavy oil wells; at the same time, the invention It has the characteristics of simple process, strong operability, long validity period and high input-output ratio. Therefore, the present invention can be widely applied in the field test of increasing single well production of heavy oil wells.

Description

[0001] 1. Technical field [0002] The invention belongs to the technical field of tertiary oil recovery, and in particular relates to a microbial single-well treatment method for heavy oil wells. [0003] 2. Background technology [0004] 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 heavy oil geological reserves 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. [0005] Due to the high content of asphalt colloid and low wax content, heavy oil has high viscosity and difficult flow, making mining very difficult. At present, steam huffing and puffing ...

Claims

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Application Information

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IPC IPC(8): E21B43/22
CPCE21B43/16
Inventor 李希明孙刚正胡婧吴晓玲郭慧刘涛冯云段传慧宋永亭曹功泽曹嫣镔
Owner CHINA PETROLEUM & CHEM CORP
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