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Solvent-assisted horizontal well interwell communication method

A horizontal and solvent-based technology, applied in the field of solvent-assisted horizontal well connection, can solve the problems of high energy consumption and high cost, and achieve the effects of low energy consumption, low cost and reduced risk

Active Publication Date: 2015-08-12
PETROCHINA CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to provide a solvent-assisted horizontal well communication method to solve the problems of high cost and high energy consumption in the traditional circulation preheating method

Method used

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  • Solvent-assisted horizontal well interwell communication method
  • Solvent-assisted horizontal well interwell communication method
  • Solvent-assisted horizontal well interwell communication method

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Embodiment Construction

[0051] In order to have a clearer understanding of the technical features, objects and effects of the present invention, the specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0052] The present invention proposes a solvent-assisted horizontal well communication method for establishing the communication between dual horizontal wells (including steam injection well 1 and production well 2). of organic solvent, the steam injection well 1 and the production well 2 are communicated by means of solvent huff and puff (similar to steam huff and puff).

[0053] The solvent-assisted horizontal well communication method of the present invention includes the following steps S1 to S5:

[0054] Step S1: inject the first organic solvent 4 into the steam injection well 1 and the production well 2 respectively, such as figure 1 , figure 2 As shown, for example, the injection is stopped until the wellbore of the steam injectio...

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Abstract

The invention provides a solvent-assisted horizontal well interwell communication method, which comprises steps: S1, a first organic solvent is injected to a steam injection well and a production well respectively, and shut-in immersion is carried out on the steam injection well ; S2, the first organic solvent in the production well is heated to enable the first organic solvent to be dissolved and diffused towards crude oil, a solvent cavity is formed, and the crude oil enters the solvent cavity and is diffused to the production well; S3, depressurizing stoping is carried out on the production well; S4, the first organic solvent is complementarily injected to the production well again; and S5, steps from S2 to S4 are repeated, and the solvent cavity is expanded continuously until the steam injection well and the production well are communicated. Advantages of gravity drainage of the horizontal wells are fully made use of, the horizontal section uniformly producing degree is improved, demands on the drilling technology are low, water consumption is little, energy consumption is little, and emission is little.

Description

technical field [0001] The invention relates to an inter-well communication method, in particular to a solvent-assisted inter-horizontal well communication method using a solvent to establish communication between a production well and a horizontal well. Background technique [0002] Double horizontal well SAGD (Steam-Assisted Gravity Drainage, Steam Assisted Gravity Drainage) to develop shallow super-heavy oil has been successful in Canada and has been commercially applied. In recent years, it has also received attention in China. In the start-up stage of SAGD, due to the low initial temperature of the reservoir and the high viscosity of the crude oil, it is difficult to form effective communication between the traditional double horizontal wells (the upper steam injection well 1 and the lower production well 2) with a well spacing of 5 meters, which leads to the difficulty of establishing effective communication between the wells near the steam injection well. After heatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/17E21B43/24
CPCE21B43/17E21B43/24E21B43/2406
Inventor 张胜飞李秀娈富庆宇杨森
Owner PETROCHINA CO LTD
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