Mid-depth layer oil reservoir double-horizontal-well equal-temperature-difference forced steam circulation preheating method

A dual-horizontal well, cyclic preheating technology, applied in earthmoving, wellbore/well components, production fluids, etc., can solve the problem of difficulty in realizing cyclic preheating in medium and deep heavy oil reservoirs, and overcome the problems of cyclic preheating. Effect

Active Publication Date: 2014-03-05
PETROCHINA CO LTD
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Problems solved by technology

[0006] The invention provides a method for forced steam circulation preheating of double horizontal wells in medium-deep oil reservoirs with equal temperature difference, aiming at the circulation preheating problem of medium-deep heavy oil reservoirs, and mainly solving the problem that the circulation preheating of medium-deep heavy oil reservoirs is difficult to realize question

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  • Mid-depth layer oil reservoir double-horizontal-well equal-temperature-difference forced steam circulation preheating method
  • Mid-depth layer oil reservoir double-horizontal-well equal-temperature-difference forced steam circulation preheating method
  • Mid-depth layer oil reservoir double-horizontal-well equal-temperature-difference forced steam circulation preheating method

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example 1

[0082] Example 1: A sandstone group oil layer in a certain oil reservoir is a sandstone group oil reservoir with a buried depth of 955 meters. The viscosity of degassed crude oil at 50°C is 53450-72340mPa.s, and the thickness of the oil layer is 15 meters. At the end of the vertical well steam huff and puff, Two pairs of horizontal well groups are deployed in the reservoir area, including 2 horizontal steam injection wells, 2 horizontal production wells, and 1 horizontal observation well. The direction of the horizontal wells is basically parallel to the structural line, and the distance between the upper and lower horizontal wells is 5 meters. According to the geological characteristics and crude oil properties of the reservoir, a cyclic preheating test of a double horizontal well pair was carried out.

[0083] The average thickness of the oil layer is greater than 15 meters, and the porosity, permeability, and vertical permeability to horizontal permeability ratio are greate...

example 2

[0088] Example 2: The Guantao Formation oil layer in an oilfield is a medium-deep ultra-heavy oil reservoir with a buried depth of 680 meters. The viscosity of degassed crude oil at 50°C is 147,500-485,400 mPa.s, and the thickness of the oil layer is 80 meters. Before the present invention, the reservoir adopts a double horizontal well combination method, and its production process is divided into two stages of huff and puff and huff and puff preheating. In the huff and puff stage, the lower horizontal well huffs and puffs for four cycles. Two cycles. Periodic oil production and oil-steam ratio are both declining, and the recovery degree is 18%.

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Abstract

The invention provides a mid-depth layer oil reservoir double-horizontal-well equal-temperature-difference forced steam circulation preheating method. The mid-depth layer oil reservoir double-horizontal-well equal-temperature-difference forced steam circulation preheating method comprises the steps: A, selecting a qualified oil reservoir; B, deploying double horizontal wells in the qualified oil reservoir; C, conducting steam huff and puff development on the upper horizontal well and the lower horizontal well at the same time to enable the pressure of the qualified oil reservoir to be decreased to be lower than 3.5MPa; D, placing an upper horizontal well steam injection pipe column and an upper horizontal well mechanical lifting pipe column down to the upper horizontal well of the double horizontal wells, and placing a lower horizontal well steam injection pipe column and a lower horizontal well mechanical lifting pipe column down to the lower horizontal well of the double horizontal wells; E, conducting circulation preheating, conducting continuous injection and extraction on the upper horizontal well and the lower horizontal well at the same time, injecting steam in the upper horizontal well and the lower horizontal well at the same time, and utilizing mechanical lifting for extracting condensed fluid at the same time, wherein the condensed fluid in the upper horizontal well is extracted from the upper horizontal well, and the condensed fluid in the lower horizontal well is extracted from the lower horizontal well.

Description

technical field [0001] The present invention relates to the field of oil injection and production, in particular to a method for forced steam cycle preheating of dual horizontal wells in medium-deep oil reservoirs with constant temperature difference, that is, a method for realizing SAGD (steam-assisted gravity drainage) of double-horizontal wells in medium-deep ultra-heavy oil reservoirs Efficient and balanced warm-up start method. Background technique [0002] Steam-assisted gravity drainage (SAGD) is an effective technical means to develop heavy oil reservoirs. For high-viscosity crude oil that has no flow ability under the original formation conditions, it needs to go through the oil layer preheating stage to realize the thermal communication between injection and production wells. Sufficient preheating of the oil layer is the prerequisite for the realization of gravity drainage. [0003] In order to establish the thermal connection between the injection and production ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/24
Inventor 杨立强杨建平梁建宇王宏远鄢旭侯国儒魏耀
Owner PETROCHINA CO LTD
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