A method for increasing the strongly water-sensitive heavy oil reservoir recovery ratio

A technology for strong water-sensitive heavy oil and heavy oil reservoirs, which is applied in the direction of production fluid, earthwork drilling and production, wellbore/well components, etc., and can solve the problem of decreased oil layer permeability, unsatisfactory production effect, and difficulties in supplementing energy by steam injection etc. to achieve the effects of reducing crude oil viscosity, increasing swept volume, and improving reservoir permeability

Inactive Publication Date: 2015-09-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the thermal recovery of heavy oil is mainly developed by steam huff and puff. Due to the high clay content in water-sensitive heavy oil reservoirs, the clay swells when it meets water, and the permeability of the oil layer is seriously reduced, which makes it difficult to replenish energy by steam injection, and the production effect is not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Well WZ36-6X1 injects anti-swelling agent to assist steam huff and puff, the buried depth of the oil layer is 900-1600m, the effective thickness of the oil layer is not less than 6m, the viscosity of the crude oil is greater than 100mPa.s under the condition of the oil layer, and the permeability of the oil layer is greater than 200×10 -3 μm 2 strong water-sensitive heavy oil reservoirs.

[0018] (1) Pre-slug SLAS-03 anti-swelling agent 3t, anti-swelling agent concentration 10% (mass), injection time 2h.

[0019] (2) Continuous steam injection for 10 days, steam injection volume 2000t, steam injection speed 7t / h, steam injection dryness 70%.

[0020] (3) Boil the well for 3 days after the steam injection, and then blow out and put into production.

[0021] (4) Transfer to the next throughput cycle after one year of production.

[0022] Among them, the main component of SLAS-03 anti-swelling agent is a multifunctional small molecule organic ammonium salt, w...

Embodiment 2

[0023] Example 2: WZ36-10X9 well injects anti-swelling agent to assist steam huff and puff, the buried depth of the oil layer is 900-1600m, the effective thickness of the oil layer is not less than 6m, the viscosity of the crude oil is greater than 100mPa.s under the condition of the oil layer, and the permeability of the oil layer is greater than 200×10 -3 μm 2 strong water-sensitive heavy oil reservoirs.

[0024] (1) 3.8 tons of SLAS-03 anti-swelling agent in front, the concentration of anti-swelling agent is 10% (mass), and the injection time is 2.5 hours.

[0025] (2) Continuous steam injection for 10 days, steam injection volume 2500t, steam injection speed 8t / h, steam injection dryness 70%.

[0026] (3) Boil the well for 3 days after the steam injection, and then blow out and put into production.

[0027] (4) Transfer to the next throughput cycle after one year of production.

[0028] The anti-swelling agent in the invention has an anti-swelling rate of up to 88% at n...

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Abstract

The invention provides a method for increasing the strongly water-sensitive heavy oil reservoir recovery ratio. The method comprises the steps of injecting antiswelling solutions in a steam injection well in a heavy oil reservoir, the injection quantity of each period being 3-4t and the injection time being 2 hours; and continuously and independently injecting steam in the steam injection well. The antiswelling solutions are obtained by using preparation water to diluting mother solutions with high concentration until the concentration becomes 10%. The method is characterized in that the antiswelling agents are injected to facilitate steam huff and puff, thereby increasing the strongly water-sensitive heavy oil reservoir recovery ratio. At high temperature, the antiswelling agents can effectively restrain clay swelling, reduce the water sensitivity of reservoir strata, increase the oil layer permeability, increase the swept volume of steam and reduce the viscosity of crude oil, thereby increasing the strongly water-sensitive heavy oil reservoir recovery ratio.

Description

technical field [0001] The invention relates to oil recovery technology in oilfields, in particular to a method for improving the recovery rate of strong water-sensitive heavy oil reservoirs. Background technique [0002] The world is extremely rich in heavy oil resources. Compared with the development technology of conventional heavy oil reservoirs, the development and research technology of heavy oil reservoirs with strong water sensitivity has certain particularities. Reservoir protection technology is the key, and the development difficulty is much greater than that of conventional heavy oil reservoirs. oil reservoir. [0003] At present, the thermal recovery of heavy oil is mainly developed by steam huff and puff. Due to the high clay content in water-sensitive heavy oil reservoirs, the clay swells when it meets water, and the permeability of the oil layer is seriously reduced, which makes it difficult to replenish energy by steam injection, and the production effect is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22E21B43/24
Inventor 孙焕泉吴光焕李洪毅李伟忠赵红雨梁金萍尹小梅赵园园邓宏伟战艾婷李伟韦涛
Owner CHINA PETROLEUM & CHEM CORP
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