SAGD production fluid treatment method and device based on two-stage separation

A treatment method and technology for produced fluids, which are applied in the treatment of hydrocarbon oil, dehydration/demulsification by chemical methods, and only multi-stage serial refining process treatment, etc., can solve the problems that the produced fluid treatment process cannot meet the treatment requirements, etc. Achieve the effect of improving crude oil recovery rate, guaranteeing treatment effect and low treatment cost

Active Publication Date: 2020-11-17
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0008] The present invention provides a SAGD production fluid treatment method and device based on two-stage separation, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem that the existing SAGD production fluid treatment process in the normal production stage cannot meet the SAGD cycle preheating The problem of the processing requirements of the stage production liquid; and the SAGD production liquid treatment method and device based on the two-stage separation of the present invention combine the two-stage separation process of pressure separation and gas-liquid separation for the first time to the SAGD cycle preheating stage production liquid Treatment, while ensuring the treatment effect of SAGD produced fluid, greatly improved the recovery rate of crude oil

Method used

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  • SAGD production fluid treatment method and device based on two-stage separation

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Effect test

Embodiment 1

[0027] Embodiment 1: The SAGD production liquid processing method based on the two-stage separation is carried out as follows: the SAGD production liquid is subjected to gas-liquid separation under pressure conditions to obtain the first gas phase and the first liquid phase, the first After the liquid phase is separated by flash evaporation, the second liquid phase and the second gas phase are obtained, and the second liquid phase is subjected to heat exchange cooling and sedimentation to obtain crude oil and purified water, and the first gas phase and the second gas phase are heat exchanged and cooled to obtain steam Condensed water and the third gas phase, the third gas phase is subjected to gas-liquid separation to obtain the third liquid phase and the gas phase to be desulfurized, and the desulfurized gas phase is obtained after desulfurization of the gas phase to be desulfurized.

[0028] The SAGD production fluid treatment method based on the two-stage separation describe...

Embodiment 2

[0033] Embodiment 2: As the optimization of the above-mentioned embodiment, the SAGD production fluid is under the condition of a pressure of 0.6MPa to 0.8MPa, and the gas-liquid separation is carried out to obtain the first gas phase and the first liquid phase, and the first liquid phase is obtained at a pressure of 0.05 After flash separation under the condition of MPa to 0.1MPa, the second liquid phase and the second gas phase are obtained; or / and, the second liquid phase after heat exchange and cooling is added to the second liquid phase after heat exchange and cooling before settling Water purifier and coagulant aid, the dosage of water purifier is 200mg / L to 600mg / L, and the dosage of coagulant aid is 2mg / L to 3mg / L.

[0034] The water purifying agent and coagulation aid used in the present invention are respectively existing known water purifying agents and coagulation aids, and the water purifying agent can adopt existing known amine water purifying agents. As a coagul...

Embodiment 3

[0037] Example 3: As an optimization of the above-mentioned Example 2, after the second liquid phase undergoes heat exchange and cooling, it first settles for the first time, and after the first settling, crude oil and primary effluent are obtained, and the primary effluent is settled again to obtain crude oil and purification out of water.

[0038] The method described in Example 3 is applicable to the incoming liquid from a single well (SAGD produced liquid) with relatively high steam content in the middle and early stage of the circulation preheating.

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Abstract

The invention relates to the technical field of SAGD circulating preheating stage produced fluid treatment, in particular to a two-section separation based SAGD produced fluid treatment method and device. The method is characterized in that high-pressure under-pressure separation and low-pressure flash-evaporation separation are performed on the SAGD produced fluid, and follow-up treatment is thenperformed. A secondary gas-liquid separating process of under-pressure separation and flash-evaporation separation is adopted, wherein the first stage is under-pressure gas-liquid separation with relatively high control pressure, and is mainly used for separating a gas phase carried in the produced fluid, and stabilizing the front end pressure of a collecting and transport system; and the secondstage is used for performing flash-evaporation separation on a first liquid phase, wherein the control pressure is relatively low, the produced fluid is sufficiently subjected to flash-evaporation, the liquid phase is partially gasified and cooled in a flash-evaporation process, and heat exchange difficulty of the liquid phase is greatly reduced; and meanwhile, the gasified gas phase can adopt a more mature gas-liquid heat exchange system, and heat exchange efficiency is higher, so that the SAGD produced fluid is lower in treatment cost.

Description

technical field [0001] The invention relates to the technical field of production fluid treatment in the SAGD cycle preheating stage, and relates to a SAGD production fluid treatment method and device based on two-stage separation. Background technique [0002] Steam-assisted gravity drainage (SAGD) is a cutting-edge technology for developing super-heavy oil at home and abroad. Using SAGD technology to exploit heavy or super-heavy oil can greatly increase the recovery factor. The SAGD production cycle includes two stages: cycle preheating and normal production. The SAGD cycle preheating stage usually lasts for 3 to 6 months. After the steam cavity is connected, it will enter the normal production stage. [0003] From 2009 to 2009, Xinjiang Oilfield successively put into operation two test areas of Zhong 32 and Zhong 37, a total of 12 pairs of SAGD well groups. During this period, the development of SAGD in Xinjiang Oilfield was in the pilot test stage, and the ground techno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G53/02C10G33/00C10G33/04
CPCC10G33/00C10G33/04C10G53/02C10G2300/1033
Inventor 蒋旭黄强卜魁勇吴昊刘景宇张侃毅李倩张瑛戚亚明刁建华翟波马兵李博舒明贺李向伟
Owner BC P INC CHINA NAT PETROLEUM CORP
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