Method for improving development effect of steam assisted gravity drainage (SAFD) through ammonium carbonate

A technology of development effect and ammonium carbonate, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of affecting steam injection capacity, ineffective oil displacement efficiency, and increasing steam lateral sweep volume, etc. Achieve the effect of improving steam utilization rate, economical and effective development, and improving swept volume

Inactive Publication Date: 2017-05-10
PETROCHINA CO LTD
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Problems solved by technology

Utilizing the properties of gas with small thermal conductivity and non-condensable gas, a heat insulation layer is formed to reduce the heat transfer rate of steam to the overlying rock layer, reduce heat loss, and improve thermal efficiency; at the same time, the non-condensable gas distributed in the upper part of the steam chamber can maintain The system pressure not only pushes the crude oil downward, but also slows down the steam’s upward overburden velocity, strengthens the lateral expansion capability of the steam ...

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  • Method for improving development effect of steam assisted gravity drainage (SAFD) through ammonium carbonate
  • Method for improving development effect of steam assisted gravity drainage (SAFD) through ammonium carbonate
  • Method for improving development effect of steam assisted gravity drainage (SAFD) through ammonium carbonate

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Embodiment 1

[0035] This embodiment provides a method of using ammonium carbonate to improve the development effect of SAGD (this embodiment applies the method to Oilfield 1).

[0036] Reservoir properties of Oilfield 1:

[0037] The buried depth of the oil reservoir is 530m, the effective thickness of the oil layer is 106.0m, the net total thickness ratio is 0.92, the average porosity is 36.5%, the average horizontal permeability is 5540md, and the ratio of horizontal permeability to vertical permeability is 0.7. There is no pure mudstone interlayer inside, and the viscosity of crude oil under oil layer conditions is 23.2×10 4 cp; The oil field has been developed with vertical well steam huff and puff for 5 years, the staged recovery rate is 10.7%, the production decline rate is 23.4%, and the formation pressure is 2-3MPa.

[0038] The process of production using ammonium carbonate to improve the effectiveness of SAGD development involves the following steps:

[0039] 1) According to th...

Embodiment 2

[0046] This embodiment provides a method of using ammonium carbonate to improve the development effect of SAGD (this embodiment applies the method to oil field 2).

[0047] Introduction to the reservoir properties of oilfield 2:

[0048] The burial depth of the reservoir is 300m, the effective thickness of the oil layer is 32.0m, the net total thickness ratio is 0.82, the average porosity is 26.0%, the average horizontal permeability is 1250md, and the ratio of horizontal permeability to vertical permeability is 0.60. There is no pure mudstone interlayer inside, and the viscosity of crude oil under oil layer conditions is 12.0×10 4 cp; The oilfield is a newly developed block with an original oil saturation of 70% and an original reservoir pressure of 3.0MPa.

[0049] The process of production using ammonium carbonate to improve the effectiveness of SAGD development involves the following steps:

[0050] 1) According to the geological characteristics and development status of...

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Abstract

The invention provides a method for improving the development effect steam assisted gravity drainage (SAFD) through ammonium carbonate. The method comprises the steps that a, a double-horizontal-well pair or a vertical well-horizontal well set is arranged, wherein in the double-horizontal-well pair, a steam injection well is located above a production well, and in the vertical well-horizontal well set, a vertical well is a steam injection well, and a horizontal well is a production well; and b, in the continuous production stage of the production well, an ammonium carbonate solution is injected into the steam injection well in a continuous injection mode or a segmental injection mode till the instantaneous oil-steam ratio is decreased to 0.1-0.2, injection of the ammonium carbonate solution is stopped, and production is completed. By adoption of the technical scheme, the production degree of a deep heavy oil reservoir can be effectively improved, the heat energy utilization rate and development efficiency are improved, the recovery ratio of the oil reservoir is increased, and the development effect of the oil reservoir is improved.

Description

technical field [0001] The invention relates to a method for improving SAGD development effect by using ammonium carbonate, which belongs to the technical field of oil field recovery. Background technique [0002] Heavy oil reservoirs refer to reservoirs with a degassed crude oil viscosity greater than 100mPa·s at the reservoir temperature. At present, thermal recovery technology is widely used in the development of domestic heavy oil fields. Currently, the widely used development methods include: steam-assisted gravity drainage, steam Huff and puff, steam flooding and other technologies. [0003] Steam Assisted Gravity Drainage (SAGD) technology was invented by Dr. Butler in 1978. After more than 30 years of continuous development and improvement, a mature application technology for commercial mining has been formed. It has been successfully applied in the development of oil sands in Canada, and the development of ultra-heavy oil reservoirs in my country's Liaohe Oilfield...

Claims

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Application Information

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IPC IPC(8): E21B43/24E21B43/22
CPCE21B43/2408E21B43/16
Inventor 郭二鹏蒋有伟张大年王宏远潘鹤
Owner PETROCHINA CO LTD
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