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A kind of method of producing crude oil in sagd wedge area

A crude oil, wedge-shaped technology, applied in the production of fluids, earthwork drilling, wellbore/well components, etc., can solve the problems of high cost and high risk, and achieve the effects of accelerated recovery, high safety, and accelerated fusion between steam chambers

Active Publication Date: 2020-07-10
PETROCHINA CO LTD
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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for producing crude oil in the SAGD wedge area, which overcomes the problems of high cost and high risk in the existing conventional infill well technology, and the method can produce the crude oil formed by conventional SAGD development at low cost and high efficiency. Remaining oil in the wedge-shaped area, increasing oil recovery rate and reducing steam consumption

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  • A kind of method of producing crude oil in sagd wedge area
  • A kind of method of producing crude oil in sagd wedge area
  • A kind of method of producing crude oil in sagd wedge area

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Embodiment

[0061] The buried depth of the target reservoir is 400m, the average effective thickness of the oil layer is 25m, the horizontal permeability is 2Darcy, and the viscosity of crude oil at formation temperature is 100000mPaS. The double horizontal well group is deployed according to the E-type well layout, and the SAGD main horizontal well group spacing (the distance between two adjacent E-type horizontal production well groups 1) is 100m.

[0062] The horizontal production well 11 is drilled first, the E-type horizontal production well group 1 is deployed 1m (first distance) from the bottom of the oil layer, and the E-type horizontal steam injection well group 2 is 5m above the E-type horizontal production well group 1 (the second distance) , the horizontal section of the horizontal production well 11 is 400m long. Three horizontal production well branch wells 12 are drilled from the tail end of the horizontal production well 11. The borehole diameter of the production well bra...

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Abstract

The invention relates to a method for producing crude oil from an SAGD wedge-shaped region. The method comprises the steps that the well arrangement of E-type horizontal production well groups and E-type horizontal steam injection well groups is completed in an SAGD oil reservoir; a solvent is injected into the E-type horizontal production well groups and the E-type horizontal steam injection wellgroups for cross-well communication, and SAGD production is conducted after the cross-well communication. By means of the method, the problems of high cost, large risk and the like in existing conventional infilling well technologies are solved, remaining oil in the wedge-shaped region formed by conventional SAGD production can be produced with low cost and high efficiency, the oil production rate is increased, and the steam consumption amount is reduced.

Description

technical field [0001] The invention relates to the technical field of oil exploitation, in particular to a method for extracting crude oil in a SAGD wedge area. Background technique [0002] The resources of ultra-heavy oil in the world are huge. As a cutting-edge technology for the development of heavy oil in the world, SAGD (Steam-Assisted Gravity Drainage, that is, steam-assisted gravity drainage) occupies a dominant position in Canadian oil sands mining. my country's Liaohe, Xinjiang Oilfields have also been applied on a large scale. The method utilizes horizontal wells and steam to effectively exploit heavy oil, super heavy oil and other resources. By continuously injecting high-quality water steam into the horizontal steam injection well, the latent heat of vaporization is released from the upper layer of the steam to heat the reservoir. Hirai output. As the reservoir fluid is continuously produced, the steam expands vertically and horizontally, forming a continuous...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/24E21B43/30
CPCE21B43/2406E21B43/305
Inventor 张胜飞张忠义李秀峦王红庄桑林翔周晓义孙新革
Owner PETROCHINA CO LTD
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