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Preheating method of dual horizontal wells with equal temperature difference and forced steam circulation in medium and deep reservoirs

A dual-horizontal well, circulation preheating technology, applied in the direction of earthwork drilling, wellbore/well components, production fluid, etc., can solve the problem of difficult to realize the circulation preheating of medium and deep heavy oil reservoirs, and achieve the goal of overcoming the circulation preheating Effect

Active Publication Date: 2017-07-07
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

Method used

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  • Preheating method of dual horizontal wells with equal temperature difference and forced steam circulation in medium and deep reservoirs
  • Preheating method of dual horizontal wells with equal temperature difference and forced steam circulation in medium and deep reservoirs
  • Preheating method of dual horizontal wells with equal temperature difference and forced steam circulation in medium and deep reservoirs

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Effect test

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 present invention proposes a method for forced steam circulation preheating of double horizontal wells with equal temperature difference in middle and deep oil reservoirs. The method for forced steam circulation preheating with double horizontal wells with equal temperature difference in middle and deep oil reservoirs includes: step A: selecting qualified oil reservoirs; step B : Deploy double horizontal wells in the qualified oil reservoir; Step C: Simultaneously perform steam huff and puff development on the upper horizontal well and the lower horizontal well, so that the pressure of the qualified oil reservoir is reduced to below 3.5MPa; Step D: In the double water well Running the upper horizontal well steam injection string and the upper horizontal well mechanical lift string in the upper horizontal well of the flat well, and running the lower horizontal well steam injection string and the lower horizontal well mechanical lift string in the lower horizontal well of the double horizontal well; steps E: Circular preheating, continuous injection and production of the upper horizontal well and the lower horizontal well at the same time, the steam is injected into the upper horizontal well and the lower horizontal well at the same time, and the condensate is recovered by mechanical lifting at the same time, the condensate in the upper horizontal well is from the upper horizontal well The horizontal well is produced, and the condensate of the lower horizontal well is produced by 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 Patents(China)
IPC IPC(8): E21B43/24
Inventor 杨立强杨建平梁建宇王宏远王诗中鄢旭侯国儒魏耀
Owner PETROCHINA CO LTD
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