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A method of oil reservoir extraction

A technology for oil reservoir development and oil reservoirs, which is applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve problems such as no solutions, reduce steam channeling, improve steam injection effect, and improve oil production. The effect of efficiency

Active Publication Date: 2018-02-02
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For the above problems, no effective solution has been proposed

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  • A method of oil reservoir extraction
  • A method of oil reservoir extraction
  • A method of oil reservoir extraction

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Embodiment Construction

[0028] In the prior art, conventional well layout methods for SAGD horizontal wells are mainly divided into vertical and horizontal well combinations and double horizontal well combinations, that is, vertical steam injection wells are arranged at the top of the reservoir, horizontal wells are arranged at the bottom, or horizontal wells are arranged at both the top and bottom. In the actual operation process of SAGD horizontal well, it is generally divided into two stages in chronological order: the first stage is the cycle preheating stage, that is, heating the crude oil at the top of the reservoir. The steam injection pipe in the steam injection well injects steam with a small displacement to heat the oil reservoir evenly, so that the crude oil in the upper part of the oil reservoir has a certain fluidity. The second stage is the steam injection gravity drainage stage, that is, the crude oil at the bottom of the reservoir is extracted. Since the steam injection well and the oi...

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Abstract

The invention discloses a steam injection pipe for oil deposit exploitation and an oil deposit exploitation method. The method comprises the following steps of: determining the length of each segment among multiple segments of a steam injection pipe; determining the material quality and size of each segment among the multiple segments under a condition that each segment among the multiple segments is equal in heat loss; generating the steam injection pipe according to the determined material quality and size of each segment among the multiple segments; and heating an oil deposit in which a steam injection well is positioned through the steam injection pipe. Through determining that the radial heat loss values of the segments of the steam injection pipe are equal, further determining the material quality and size of each segment of the steam injection pipe, generating the steam injection pipe according to the determined material quality and size and heating the oil deposit, the oil deposit is uniformly heated by each segment of the steam injection pipe, further the steam injection effect of the steam injection pipe is improved, a steam channeling phenomenon is reduced, and further the oil extraction efficiency is improved.

Description

technical field [0001] The invention relates to an oil production process, in particular to a steam injection pipe for oil reservoir development and an oil reservoir production method. Background technique [0002] SAGD (Steam Assisted Gravity Drainage) is a super heavy oil reservoir development technology. This technology is to inject steam into the oil reservoir from a vertical well or a horizontal well above the horizontal production well near the bottom of the oil reservoir to heat the oil reservoir, and the heated crude oil and steam condensate are drawn from the horizontal well at the bottom of the oil reservoir output. This technology has the advantages of high oil recovery capacity, high oil-steam ratio, high recovery rate and low interwell interference, and this technology can effectively avoid the problem of premature interwell channeling. [0003] At present, SAGD heats the reservoir by injecting steam into the steam injection pipe. Then, because the area of ​​t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24
CPCE21B43/2406
Inventor 贺梦琦张绍辉陈小凯王玲纪加韩东杨连行马振贾俊敏王文刚匡韶华郝玲刘满军候兴卫佟德水王昕马威哈长鸣孙博张红军戚勇邵堃丁晓
Owner PETROCHINA CO LTD