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Oil extraction method for steam assisted gravity drainage (SAGD) dual horizontal well and tubular column equipment of oil extraction method

A technology of double horizontal wells and pipe strings, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc. It can solve the problems of complex lifting process conditions and limited use of equipment, and achieve the solution of lifting process work. Complex conditions, simple working conditions, and small equipment restrictions

Inactive Publication Date: 2016-10-05
PETROCHINA CO LTD
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Problems solved by technology

[0007] The main purpose of the present invention is to provide a SAGD double-horizontal well oil production method and its string equipment, so as to solve the problem of complicated lifting process conditions and limited use of equipment in SAGD shallow oil production in the prior art

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  • Oil extraction method for steam assisted gravity drainage (SAGD) dual horizontal well and tubular column equipment of oil extraction method
  • Oil extraction method for steam assisted gravity drainage (SAGD) dual horizontal well and tubular column equipment of oil extraction method

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Embodiment Construction

[0025] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0026] In the prior art, for the lifting process of SAGD oil production technology, especially for shallow oil production, it is necessary to take out all the string equipment in the production well and replace a large number of pumping equipment when transferring from the cycle preheating stage to the production stage . Moreover, due to the particularity of shallow oil exploitation and the geological conditions of our country, oil pumping equipment such as electric submersible pumps, rod pumps, etc., all have the problem of not being able to work stably for a long time, and the equipment is easily damaged, which seriously restricts the production of oil wells and increases workover operations....

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Abstract

The invention provides an oil extraction method for steam assisted gravity drainage (SAGD) dual horizontal wells and tubular column equipment of the oil extraction method. The SAGD oil extraction method comprises a circulation preheating stage and a production stage which are conducted in sequence. The production stage comprises a lifting technique. The circulation preheating stage comprises the steps that steam is injected into the producing well through the first tubular column equipment; steam is injected into the steam injection well arranged above the producing well in parallel through the second tubular column equipment; and the producing well is made to communicate with the steam injection well. The lifting technique comprises the steps that the first tubular column equipment is reserved when the circulation preheating stage shifts to the production stage; and the well bottom pressure of the steam injection well is increased, so that oil reservoir fluid in the producing well is lifted to the ground through the first tubular column equipment. By the adoption of the technical scheme of the oil extraction method and the tubular column equipment thereof, the problems that in the prior art, working conditions of a lifting technique during SAGD shallow oil extraction are complex, and equipment application is limited are effectively solved.

Description

technical field [0001] The invention relates to the technical field of SAGD ultra-heavy oil production, in particular to a SAGD double-horizontal well production method and a pipe string device thereof. Background technique [0002] SAGD (Steam Assisted Gravity Drainage) technology is used for super heavy oil recovery. During the oil production phase, the oil-water mixture in the production well needs to be lifted to the surface. During the lifting process, there are problems such as high downhole fluid temperature, large liquid volume, and possible hydrogen sulfide corrosion downhole. [0003] For the lifting process of SAGD shallow oil recovery, gas lift is used in the prior art to complete the lifting of reservoir fluid. Specifically, natural gas is injected into production wells and dilutes the oil-water mixture and reduces its density, which is more conducive to the lifting of reservoir fluids. However, the above method needs to have sufficient natural gas source at ...

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Application Information

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IPC IPC(8): E21B43/24
Inventor 陈森黄勇李林张磊游红娟蒲丽萍郭文德张玉凤
Owner PETROCHINA CO LTD
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