Steam-assisted gravity channel oil extraction method

Abstract

The invention relates to the technical field of thickened oil recovery, in particular to a steam-assisted gravity channel oil recovery method. According to the channel thermal recovery method, a horizontal section of a horizontal well is drilled into an inclined horizontal section, a tiptoe (the front end of the horizontal section of the horizontal well) penetrates through a vertical well, good communication is formed, steam injection is conducted through the inclined horizontal well, and oil extraction is conducted through the vertical well. The practical problems that in the heavy oil thermal recovery process, steam injection heating is uneven, heat is wasted, the recovery rate is reduced, the flow resistance of a horizontal well steam injection tubular column in the horizontal section is increased, crude oil is difficult to discharge, and the operation pressure is increased can be solved, and the device can be independently used, can also be combined with a traditional steam injection mode for use, can be applied to newly developed oil fields and has a wide application prospect. The device can be applied to an old oil field, can be used for drilling a new well, can also be realized by sidetrack drilling of an old well, can be used for injecting steam by using an electric heating steam generator and can also be used for injecting steam by using a ground steam injection boiler, and is one of the optimal modes for saving energy, reducing consumption, improving the recovery rate of thickened oil and converting a development mode in an old thermal recovery area.

Description

Technical field: [0001] The invention relates to the technical field of heavy oil recovery, in particular to a steam-assisted gravity channel recovery method. Background technique: [0002] my country is rich in heavy oil resources and has proven reserves of about 4 billion tons, accounting for more than 20% of the total oil reserves. They are distributed in the five heavy oil development and production areas of Liaohe Oilfield, Xinjiang Oilfield, Shengli Oilfield, Henan Oilfield and Bohai Oilfield. People are paying more and more attention to the development and utilization of heavy oil resources, which has become the main force for increasing oil reserves and production in my country. Heavy oil reservoirs have the characteristics of shallow burial, thick oil quality, scattered distribution, and serious reservoir heterogeneity. It is difficult to effectively exploit conventional mining methods. At present, the technical means for mining heavy oil generally include: steam huf...

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Problems solved by technology

[0007] In view of the problems existing in the prior art, the object of the present invention is to provide a steam-assisted gravity channel oil recovery method, which is to drill the horizontal section of the horizontal well into an inclined horizontal section, and the toe (the front end of the horizontal section of the horizontal well) (1) passes through a The vertical well (2) has a good connection, the inclined horizontal well (3) injects steam, and the vertical well (2) produces oil. This channel thermal recovery method can solve the problem of uneven heating of steam injection and waste of heat in thermal recovery during the thermal recovery of heavy oil. , Reservoir heterogeneity and the reduction of recovery rate caused by the thinning of the oil layer, the increase of the flow resistance of the horizontal section of the steam injection string (8) in the horizontal well, the difficulty of crude oil drainage, and the increase of operating pressure, etc. During the production process, the steam chamber is well developed, the production of the reservoir is balanced, the crude oil is discharged smoothly, the operating pressure is reduced, the oil recovery efficiency is improved, the recovery rate is increased, the consumption of steam is significantly reduced, the energy consumption is greatly reduced, and the cost is reduced and the efficiency is increased. significantly

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