Method for using combustion and vapor combination flooding to exploit thick oil

A combined mining and composite flooding technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve problems such as inability to form effective thermal communication, reduce swept volume, and affect development effects

Active Publication Date: 2012-11-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] (1) The implementation process of forward dry combustion is very difficult. From the combustion front (fire line) to the production well, the temperature gradient is large, and effective thermal communication cannot be formed, so it is difficult to control underground combustion
[0007] (2) The combustion front (line of fire) is a narrow high-temperature area, and the driven fluid must flow to the production well through the low-temperature area of ​​the reservoir. The viscosity of crude oil is high, especially for extra-heavy crude oil, which may cause fluid blockage
[0008](3) As the combustion front (line of fire) advances, the gas injection pressure and gas injection volume must be gradually

Method used

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  • Method for using combustion and vapor combination flooding to exploit thick oil
  • Method for using combustion and vapor combination flooding to exploit thick oil
  • Method for using combustion and vapor combination flooding to exploit thick oil

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Experimental program
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Effect test

Embodiment 1

[0076]The buried depth of the oil layer in Oilfield 1 is -800~-1000m, and the average oil layer thickness is 42.1m. The average porosity is 25.5%, and the average permeability is 780mD. The viscosity of crude oil is high, and the average viscosity of degassed crude oil at 50°C is 300-2000mPa·s. Five-point well pattern with a well spacing of 71m. In the early stage, the steam huff and puff development was mainly used. At present, the formation pressure is low, with an average of only 1.2MPa, the underground water storage is large, the stepping water rate is only 32.3%, and the remaining oil saturation between wells is 44.5%.

[0077] (1) Carry out rough screening according to the geological characteristics and development status of the oilfield. The reservoir meets the following conditions: reservoir depth 0.35, reservoir thickness>10.0m, reservoir porosity>0.2, reservoir permeability>200mD, crude oil viscosity<100000mPa·s.

[0078] (2) Firstly, the interwell temperature is ...

Embodiment 2

[0083] Oilfield 2 oil layer buried depth is -1640~-1740m, average oil layer thickness is 69.7m. The average porosity is 21.2%, and the average permeability is 1376mD. The viscosity of crude oil is high, and the average viscosity of degassed crude oil at 50°C is 2000-3500mPa·s. Row-column well pattern with a well spacing of 105m. In the early stage, the steam huff and puff development was mainly used. At present, the formation pressure is low, only 2-3 MPa, the underground water storage is large, the stepping water rate is only 27.6%, and the remaining oil saturation between wells is 46.3%.

[0084] (1) Carry out rough screening according to the geological characteristics and development status of the oilfield. The reservoir meets the following conditions: reservoir depth 0.35, reservoir thickness>10.0m, reservoir porosity>0.2, reservoir permeability>200mD, crude oil viscosity<100000mPa·s.

[0085] (2) Firstly, the interwell temperature is evaluated for the oil reservoir whe...

Embodiment 3

[0090] Oilfield 3 oil layer has a buried depth of -875--1015m and an effective thickness of 42-70m. The average porosity is 25.0%, and the average permeability is 1335mD. The viscosity of crude oil is high, and the average viscosity of degassed crude oil at 50°C is 59834mPa·s. Vertical well-horizontal well combination, the well spacing is 70m. In the early stage, steam huff and puff development was mainly used. At present, the formation pressure is low, only 2.0MPa, the underground water storage is large, the water recovery rate is 65%, and the remaining oil saturation between wells is the highest at 56%.

[0091] (1) Carry out rough screening according to the geological characteristics and development status of the oilfield. The reservoir meets the following conditions: reservoir depth 0.35, reservoir thickness>10.0m, reservoir porosity>0.2, reservoir permeability>200mD, crude oil viscosity<100000mPa·s.

[0092] (2) Firstly, the interwell temperature is evaluated for the o...

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Abstract

The invention discloses a method for using combustion and stream combination flooding to exploit thick oil. The method comprises the following steps of: carrying out vapor huff and puff exploitation in a heavy crude oil reservoir; carrying out in-situ combustion exploitation after forming thermal linkage; and changing single air charging to be simultaneous charging of air and water vapor in certain proportion to carry out combination flooding exploitation. A proper optimal configuration relationship of air /vapour charging speed is selected, so as to improve combustion wave and volume of the oil reservoir and improve exploitation effects of in-situ combustion and the ultimate recovery factor.

Description

technical field [0001] The invention relates to a technology for enhancing oil recovery of heavy oil reservoirs, which is applicable to a method for enhancing oil recovery by burning oil layers in heavy oil reservoirs, and specifically relates to a method for exploiting heavy oil by combining burning and steam flooding Methods. Background technique [0002] my country's heavy oil reservoirs have the characteristics of continental deposits, with serious heterogeneity, complex geological structures, multiple types of reservoirs, and deep burial of reservoirs. Heavy oil reserves with a reservoir depth greater than 800m account for more than 80% of the proven reserves, and about half of the reservoirs are buried at a depth of 1300-1700m. At present, it has entered the late stage of steam stimulation development, and is in the stage of low production and low efficiency. It is urgent to change the development method. [0003] Steam flooding refers to injecting steam into one or ...

Claims

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Application Information

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IPC IPC(8): E21B43/24E21B43/243
Inventor 张方礼任芳祥王海生龚姚进刘其成赵庆辉孙洪军刘宝良宫宇宁张勇程海清
Owner PETROCHINA CO LTD
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