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Super heavy oil SAGD exploitation method

A mining method and ultra-heavy oil technology, which is applied in the fields of extraction fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of low crude oil extraction efficiency and low oil-gas ratio of crude oil, etc., so as to improve the production quality and oil The steam ratio and the effect of improving mining efficiency

Inactive Publication Date: 2020-07-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a SAGD production method for super heavy oil, to solve the problems of low crude oil production efficiency and low oil-gas ratio of crude oil in the SAGD super heavy oil production method in the prior art

Method used

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  • Super heavy oil SAGD exploitation method
  • Super heavy oil SAGD exploitation method
  • Super heavy oil SAGD exploitation method

Examples

Experimental program
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Effect test

Embodiment 1

[0025] exist figure 1 In the optional embodiment shown, the super heavy oil SAGD recovery method includes the following steps:

[0026] Step S10, the SAGD super-heavy oil recovery method provided by this application adopts the well layout method of parallel double horizontal wells, and the steam injection well 10 and the production well 20 are set, and the steam injection well 10 and the production well 20 are both extended to the super-heavy oil reservoir .

[0027] Optionally, in step S10, the steam injection well 10 includes a vertical steam injection well section 11 and a horizontal steam injection well section 12, and the production well 20 includes a vertical production well section 21 and a horizontal production well section 22, and the horizontal steam injection well section Section 12 is closer to the surface relative to horizontal production well section 22 .

[0028] Step S11 , setting a plurality of observation wells extending along the vertical direction and arr...

Embodiment 2

[0052] The difference between Embodiment 2 and Embodiment 1 is that the super-heavy oil SAGD production method also includes step S60, real-time monitoring of the pressure at the wellhead of the steam injection well 10 located in the super-heavy oil reservoir, when the pressure drops to the set value , the injection tool 30 is proposed from the tool lowering well 40, the pipe string originally arranged in the observation well 40 as the tool lowering well 40 is lowered into the observation well, and the inlet is replaced with a thermal recovery wellhead, and then passed through the lowering well 40 as the tool Observation wells for super-heavy oil reservoirs are injected with steam.

[0053] Under the condition that the amount of steam injected into the super-heavy oil reservoir through the steam injection well 10 remains unchanged, when the injection tool 30 sprays the interlayer 2 to cause cracks to appear in the interlayer 2, the steam injection well 10 located in the super-h...

Embodiment 3

[0059] The difference between the third embodiment and the first embodiment is that, in the case where the observation well cannot be used as the tool lowering well 40, in step S30, a construction well is dug on the ground as the tool lowering well 40, and the tool lowering well 40 is controlled by the ground. Extend vertically and pass through the interlayer 2. In this way, the versatility of the SAGD super-heavy oil recovery method can be improved, so that it can be applied to reservoirs in different environments.

[0060] In the third embodiment, the excavated construction well is used as the tool lowering well 40, and the injection tool 30 is extended to the position of the interlayer 2 through the tool lowering well 40, and the interlayer 2 is sprayed so that the steam chamber 1 can break through the interlayer 2, The upward expansion speed of the steam chamber 1 is accelerated, and the purpose of uniformly heating the super heavy oil reservoir and increasing the producti...

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Abstract

The invention provides a super heavy oil SAGD exploitation method. The super heavy oil SAGD exploitation method comprises the following steps that S10, a steam injection well and a production well arearranged, and the steam injection well and the production well extend to a super heavy oil reservoir; S20, steam is introduced into the super heavy oil reservoir through the steam injection well and / or the production well so as to form a steam cavity in the super heavy oil reservoir; S30, the position of an interlayer in the super heavy oil reservoir is determined, a tool lowering well is arranged, and the tool lowering well extends to the position of the interlayer; S40, a spraying tool is lowered into the position of the interlayer through the tool lowering well; and S50, sand-containing fluid is sprayed to the interlayer through the spraying tool, so that a crack is formed in the interlayer, and the steam cavity breaks through the interlayer through the crack. According to the super heavy oil SAGD exploitation method, the problems of low crude oil exploitation efficiency and low oil-steam ratio of the exploited crude oil in the SAGD super heavy oil exploitation method in the priorart can be solved.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a super heavy oil SAGD exploitation method. Background technique [0002] The SAGD super-heavy oil production method in the prior art includes the following steps: setting a steam injection well and a horizontal well, passing steam into the super-heavy oil reservoir simultaneously through the steam injection well and the horizontal well, and injecting steam in the horizontal steam injection well of the steam injection well A thermally and hydraulically connected connecting section is formed between the horizontal well section and the production horizontal well section, and an inverted triangle-shaped steam chamber is formed above the horizontal steam injection well section; stop injecting steam into the super heavy oil reservoir through the horizontal well, Inject high-dryness steam into the steam chamber through the steam injection well. The high-dryness steam rel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24E21B43/26
CPCE21B43/2408E21B43/26
Inventor 张磊陈森游红娟潘竟军蒲丽萍蔡卓林何小东黄勇杨洪李畅
Owner PETROCHINA CO LTD
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