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sagd production method of heavy oil reservoir

A technology of heavy oil reservoirs and production methods, which is applied in the direction of production fluid, earthwork drilling and production, wellbore/well components, etc., can solve the problems that the steam injection pressure control measures have not been elaborated in detail, and have not been considered, so as to reduce the production cost, Reduce the injection volume and eliminate the effect of lowering the oil-steam ratio

Active Publication Date: 2017-01-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventive method is only aimed at reducing the heat loss from a single steam chamber to the top and bottom cap layers, and does not consider the method of adjusting the operating parameters of the steam chambers of adjacent SAGD well groups in the process of large-scale development; at the same time, the method points out that the continuous injection of pure After 3 years of steam SAGD production, it was changed to inject a mixture of steam and nitrogen. The total injection volume of nitrogen was 0.1PV, and then continued to inject pure steam. Describe the steam injection pressure control measures

Method used

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  • sagd production method of heavy oil reservoir

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Embodiment 1

[0075] refer to Figure 1-Figure 3 As shown, a heavy oil reservoir SAGD production method, the heavy oil reservoir is an undeveloped heavy oil reservoir, the average buried depth is 300m, the original reservoir pressure is 2.8MPa, the fracture pressure of the oil layer is 6MPa, and the thickness of the oil layer is The effective average is 26m, which is suitable for deploying SAGD well group scale development.

[0076] The heavy oil reservoir SAGD mining method provided in this embodiment includes the following specific steps:

[0077] refer to figure 2 As shown, the first SAGD well group 3 is deployed in the production area of ​​the heavy oil reservoir, and the first SAGD well group 3 includes the SAGD well pair 1 and the monitoring well 2 . Each SAGD well pair is composed of one injection well and one production well, wherein the injection well and the production well are horizontal wells whose horizontal sections are parallel to each other and overlap each other up and d...

Embodiment 2

[0101] refer to Figure 1-Figure 3 As shown, a heavy oil reservoir SAGD production method, the heavy oil reservoir is an undeveloped heavy oil reservoir, the average buried depth is 500m, the original reservoir pressure is 4.8MPa, the fracture pressure of the oil layer is 10MPa, and the thickness of the oil layer is The effective average is 34m, which is suitable for deploying SAGD well group scale development.

[0102] The heavy oil reservoir SAGD mining method provided in this embodiment includes the following specific steps:

[0103] refer to figure 2 As shown, the first SAGD well group 3 is deployed in the production area of ​​the heavy oil reservoir, and the first SAGD well group 3 includes the SAGD well pair 1 and the monitoring well 2 . Each SAGD well pair is composed of one injection well and one production well, wherein the injection well and the production well are horizontal wells whose horizontal sections are parallel to each other and overlap each other up and ...

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Abstract

The invention relates to a method for exploiting a heavy oil reservoir by adopting an SAGD. The method comprises the following steps: a first SAGD well group is arranged on the heavy oil reservoir, the heavy oil reservoir is preheated, and pure steam or a steam composition is injected in the preheated first SAGD well group to form a steam cavity for production; when the steam cavity of the first SAGD well group ascends to the top of an oil layer, a second SAGD well group is arranged; when the steam cavity of the first SAGD well group is expanded to the interwall middle position, a pure non-condensation gas and a steam composition are injected in the first SAGD well group alternatively for plugging; when the steam cavity of the first SAGD well group descends, pure steam or a steam composition is injected in the second SAGD well group to form a steam cavity for production; when the production of the first SAGD well group is completed, the steam cavity of the second SAGD well group is expanded to the interwell middle position in the well, and a pure non-condensation gas and a steam composition are injected in the second SAGD well group alternatively for plugging to control the pressure in the steam cavity.

Description

technical field [0001] The invention relates to a mining method for a heavy oil reservoir in an oil field, in particular to a mining method for an integrated heavy oil reservoir using a steam-assisted gravity drainage technology, and belongs to the field of petroleum exploitation. Background technique [0002] Steam Assisted Gravity Drainage (SAGD for short) is a steam-assisted gravity drainage technology. SAGD was invented by Canada's Bulter in 1978. It has been successfully applied in heavy oil reservoirs in Canada's oil sands mining area, my country's Liaohe Oilfield, and Xinjiang Oilfield. The principle is to deploy horizontal well pairs superimposed on the same oil layer. High-quality steam is injected into the upper steam injection well, and the steam covers the formation upwards to form a steam cavity because the density is much smaller than that of crude oil. In exchange, the viscosity of the heated crude oil is reduced, and the condensed water flows downward under th...

Claims

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Application Information

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IPC IPC(8): E21B43/24
CPCE21B43/2406E21B43/2408
Inventor 吴永彬李秀峦
Owner PETROCHINA CO LTD
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