Thermochemistry auxiliary reinforced steam flooding method

A steam flooding and thermochemical technology, applied in earthwork drilling, production fluid, wellbore/well components, etc., can solve problems such as increased formation heat loss, small steam heat sweep range, and impact on mining effects, etc., to increase reserves Production degree and recovery factor, increase steam heat sweep range, and achieve economical and effective production

Inactive Publication Date: 2008-09-03
SHENGLI OILFIELD PETROLEUM DEV CENT
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The viscosity of crude oil is high, especially at 50°C, the viscosity of crude oil is greater than 10×10 4 mPa.s ultra-heavy oil reservoir, the steam injection process has high seepage resistance, high steam injection pressure, and poor steam injection quality. The existing thermal recovery technology cannot break through the production capacity barrier.
[0005] 2. Oil layers are deeply buried (greater than 1000m) and thin (less than 10m), resulting in increased wellbore and formation heat loss, low dryness of steam injection, small steam heat sweep range, and poor huff and puff effect
[0006] 3. The interlayer is thin and has strong edge and bottom water, which makes it easy for the steam injection process to escape from the pipe, and with the increase of the recovery degree, the edge and bottom water intrus

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Examples

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Embodiment 1

[0045] Example 1: A block with an oil-bearing area of ​​5.2km 2 , proven oil reserves in place 1825×10 4 Ton. The main oil-bearing formation is Shashangshang, the buried depth of the oil layer is 1280-1425m, the thickness of the oil layer is 4-12m, the porosity is 32.8-34.4%, and the permeability is 4913-7280×10 -3 μm 2 . At 80°C, the viscosity of crude oil is 9024~60987mPa.s (the viscosity of crude oil at 50°C is greater than 20×10 4 mPa.s, up to 100×10 4 mPa.s), which is a medium-deep ultra-heavy oil reservoir with strong edge and bottom water effects. During the 20 years from the discovery of this block in 1984 to 2004, a total of 10 vertical wells and 1 horizontal well were drilled. 2 Auxiliary steam huff and puff, SAGD pilot test and other work, due to the high viscosity of crude oil, the deep burial of oil layers and the influence of edge and bottom water, the periodic development effect is poor, and the reserves have not been developed.

[0046] In view of the ge...

Embodiment 2

[0068] Example 2: The oil-bearing area of ​​a certain block is 3.4km 2 , proven geological reserves 1977×10 4 t, the main oil-bearing formation is Shashang 3, the reservoir depth is 1300-1500m, the porosity is 24-31%, and the permeability is 600-1000×10 -3 μm 2 , the viscosity of ground degassed crude oil at 50℃ is 15×10 4 ~20×10 4 mPa.s, is a medium-deep ultra-heavy oil reservoir with strong edge and bottom water. During the 23 years since the discovery of this block in 1982 to 2005, a total of 5 vertical wells and 1 horizontal well have been drilled, and various mining methods have been adopted to assist subcritical boiler steam injection, high-pressure filling sand control, and fracturing sand control. However, due to the deep burial of oil layers, high steam injection pressure, poor quality of steam injection, and poor mining effect, the block cannot be industrialized.

[0069] According to the geological characteristics of the reservoir, the properties of crude oil a...

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Abstract

The present invention relates to a thermochemistry assistant strengthening steam drive method for thermal recovery of horizontal well using oil-soluble compound viscosity reducer and carbon dioxide. The technique scheme is that: Drilling an horizontal well below the heavy oil reservoir layer, injecting periodically oil-soluble compound viscosity reducer, carbon dioxide liquid and steam in slug injection forms to horizontal well, after shutting in well and opening to blow, continuous oil extraction is operated by the inner lower pump in horizontal well. The present invention can reduce base oil viscosity of super heavy oil reservoir in lower or middle deep layers greatly, reduce steam injection pressure greatly, enhance steam hot wave and range, and enhance period exploitation effect. The scene experiment proves that the average period oil-steam ratio reaches to 0.75, average period oil production is 1800t, the room experiment proves that developing thermochemistry assistant strengthening steam drive in the late period of middle deep layer of super heavy oil reservoir, the final oil reservoir recovery can reach about 40%.

Description

1. Technical field: [0001] The invention relates to an oilfield exploitation technology, in particular to a thermochemically assisted enhanced steam flooding method utilizing an oil-soluble composite viscosity reducer and carbon dioxide to assist the thermal recovery development of a horizontal well. 2. Background technology: [0002] With the massive consumption of conventional oil and gas resources and the rising demand for oil, heavy oil resources have become the main potential for next-stage development due to their wide distribution, huge reserves, and low production rate of reserves. [0003] Domestic heavy oil resources are very rich, and the predicted proven reserves are 80×10 8 Ton. In the currently proven 20.6×10 8 Among the tons of heavy oil reserves, the undeveloped geological reserves are 7.01×10 8 Ton. Most of this reserve is due to: [0004] 1. The viscosity of crude oil is high, especially at 50°C, the viscosity of crude oil is greater than 10×10 4 mPa....

Claims

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Application Information

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IPC IPC(8): E21B43/16E21B43/22E21B43/24
Inventor 刘中云毕义泉张继国李安夏张广卿李兆敏赵洪涛才巨宏邱国清冀延民贾云飞
Owner SHENGLI OILFIELD PETROLEUM DEV CENT
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