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Oil extraction method through carbon dioxide overall over-injection different-well huff and puff of low-pressure fractured tight oil reservoir

A technology for tight oil reservoirs and carbon dioxide, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve problems such as difficult miscibility, gas drive channeling, seepage capacity difference, etc., and achieve good injectivity and diffusion capacity Strong, enhance the effect of oil displacement

Active Publication Date: 2020-12-08
SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such "low pressure", "fractured" and "ultra-low permeability" reservoirs 2 Flooding, formation crude oil and CO under the condition of original formation pressure 2 It is difficult to mix phases, and the huge difference in seepage capacity between fractures and tight matrix leads to severe channeling during gas drive
Therefore, CO 2 Oil flooding, related technologies still need to be perfected

Method used

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  • Oil extraction method through carbon dioxide overall over-injection different-well huff and puff of low-pressure fractured tight oil reservoir
  • Oil extraction method through carbon dioxide overall over-injection different-well huff and puff of low-pressure fractured tight oil reservoir
  • Oil extraction method through carbon dioxide overall over-injection different-well huff and puff of low-pressure fractured tight oil reservoir

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Embodiment 1

[0039] Taking a test area as an example, the method of the invention is explained in detail.

[0040] The invention relates to an oil recovery method of carbon dioxide integral over-injection and stimulation in a low-pressure fractured tight oil reservoir, which comprises the following steps:

[0041] (1) Select the ultra-low permeability reservoir block with good continuity of injection-production wells. There are 169 oil-water wells and 36 groups of injection-production wells in the block. The well pattern of the block is a regular anti-nine-point well pattern, and the long axis orientation of the anti-nine-point well pattern corresponds to the fracture development orientation, which is NE70°, as shown in Figure 1. Figure 1 ; The reservoir is 4+5 of Yanchang Formation of Triassic, with an average effective thickness of 9.61m, an average porosity of 12.8% and an average permeability of 0.784×10. -3 μm 2 , the original formation pressure is 13.30MPa, the buried depth of the reserv...

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Abstract

The invention discloses an oil extraction method for carbon dioxide overall over-injection different-well huff and puff of a low-pressure fractured tight oil reservoir. The method is characterized inthat an original CO2 immiscible-phase drive oil reservoir is integrally pressurized and converted into a CO2 miscible-phase drive oil reservoir through oil reservoir overall over-injection, so that CO2 and crude oil are miscible to achieve the optimal oil displacement effect; and meanwhile, in order to prevent gas channeling in the CO2 displacement implementation process of the fractured tight oilreservoir, CO2 is injected through different wells in a huff and puff manner, the high expansion and shrinkage performance of CO2 gas is brought into play by fully utilizing pressure disturbance, matter exchange between a fracture system and a tight matrix is promoted, channeling of the gas along fractures is inhibited, and the CO2 utilization rate is increased.

Description

Technical field [0001] The invention belongs to the technical field of improving oil recovery in oil fields, and in particular relates to an oil recovery method of carbon dioxide integral over-injection and different well stimulation in a low-pressure fractured tight oil reservoir. technical background [0002] Ultra-low permeability / tight reservoir occupies a very important position in oil and gas resources at home and abroad, and its proportion will continue to increase with the gradual deepening of exploration. There are some outstanding problems in the development of this kind of reservoir, such as low natural productivity and low water flooding recovery. [0003] CO 2 It has the advantages of strong penetration ability and good miscibility with crude oil, etc. CO 2 Oil displacement technology has also been widely used in the United States, Canada and other countries, and it has been proved that it can effectively improve the oil displacement development effect of ultra-low p...

Claims

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Application Information

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IPC IPC(8): E21B43/16E21B43/30E21B43/26E21B47/06
CPCE21B43/164E21B43/30E21B43/168E21B43/26E21B47/06Y02P90/70
Inventor 王伟赵永攀陈怡秀姚振杰李剑康宇龙李超跃
Owner SHAANXI YANCHANG PETROLEUM GRP
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