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SAGD mudstone interlayer jet-fluidic squeeze-acid reforming method

A technology for interlayer and mudstone, applied in the field of oil and gas field development, can solve the problem that the shallow oil sand is difficult to achieve acid liquid flowback, etc., and achieves the improvement of circulation preheating effect, porosity and uniformity, and ultimate recovery factor. Effect

Active Publication Date: 2019-06-25
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention realizes the reformation of thin interlayers near the wellbore by injecting reforming fluid in layers, which is only suitable for thin interlayers near the wellbore, but it is difficult to realize effective interlayers far away from the wellbore, thick interlayers and randomly distributed interlayers. and the configuration of the reforming fluid used in this invention is only suitable for the reformation of deep heavy oil, but it is difficult to achieve acid liquid flowback for shallow oil sands

Method used

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  • SAGD mudstone interlayer jet-fluidic squeeze-acid reforming method
  • SAGD mudstone interlayer jet-fluidic squeeze-acid reforming method
  • SAGD mudstone interlayer jet-fluidic squeeze-acid reforming method

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Embodiment 1

[0043] figure 1 It is a schematic diagram of the fluid squeeze expansion effect of SAGD well without mudstone interlayer reservoir, because there is no obstruction of mudstone interlayer, the expansion area is relatively large; figure 2 It is a schematic diagram of the expansion effect of SAGD wells with mudstone interlayer reservoirs. Due to the barrier effect of mudstone interlayers, the expansion area is affected, which in turn affects the oil production. This embodiment proposes a new concept of hydraulic pulse expansion, which realizes pressurization and expansion of oil sand reservoirs through hydraulic pulse generators, and realizes vibration and crushing of dissolved interlayers, fundamentally solving the hindrance effect of mudstone interlayers.

[0044] The SAGD reservoir of this embodiment is located in Fengcheng Oilfield, Xinjiang. The reservoir is an oil sand reservoir, and there are multiple mudstone interlayers at different depths in the reservoir.

[0045] Su...

Embodiment 2

[0064] According to another embodiment of the SAGD mudstone interlayer's jet-squeezing acid transformation method, its steps, principles, beneficial effects, etc. are the same as those in Embodiment 1, except that:

[0065] The reservoir in this embodiment is located in the Guantao Formation Oilfield, Block Du 84, Shuyi District, Liaohe Oilfield, and the interlayer is a physical interlayer in the sand layer.

[0066] In Step 1, the lateral extension of the mudstone interlayer is 4m. In step 3, the jet pressure used is 30MPa, and the pressure difference is 25MPa; the abrasive with a concentration of 8% is added to the jet liquid; the flow rate of the jet liquid is 2.5m 3 / min, and the jetting time is 15 minutes; the diameter of the wellbore opened by the hydraulic jet is 200 times the diameter of the screen hole on the screen. In Step 5, the foaming agent is cetyltrimethylammonium bromide, and the diverting agent is benzoic acid; the flow rate of the foam acidification reformi...

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Abstract

The invention relates to a jet flow combined operation acid extrusion transformation method of an SAGD (Steam Assisted Gravity Drainage) mudstone interlayer. The method comprises the following steps that a sieve pipe of a horizontal section of a steam injection well is perforated through hydraulic jet; an oil sand reservoir and a mudstone interlayer are further perforated; transformation liquid is discharged and extruded into a continuous oil pipe; the pump pressure of the steam injection well is controlled in the liquid extrusion process; the maximum well bottom pressure of the steam injection well is enabled to be 1MPa smaller than the formation fracture pressure; meanwhile, the well bottom pressure of an oil producing well is maintained to be the standing water pressure; the transformation liquid enters the oil sand reservoir through a borehole perforated through hydraulic jet, further contacts the mudstone interlayer, and gradually corrodes sand-mud ingredients in the mudstone interlayer; and the pressurization and volume expansion of the oil sand reservoir are realized through a hydraulic pulse generator after the liquid extrusion is completed. The transformation method provided by the invention is applicable to a sieve pipe well completion thick-oil oil sand reservoir; the mudstone and sand-mudstoneinterlayers between upper and lower wells and above an upper well can be effectively penetrated and corroded; a volume expansion region which surrounds the upper and lower wells and is uniformly distributed along the horizontal well section is formed; and the circulation preheating effect and the finial single well harvesting rate are improved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a SAGD mudstone interlayer jet-squeeze-acid transformation method, which is suitable for the transformation of mudstone interlayers in oil sand reservoirs. Background technique [0002] The Fengcheng Oilfield in the Junggar Basin of Xinjiang is rich in super-heavy oil resources, and several sets of Steam Assisted Gravity Drainage (SAGD) dual horizontal wells have been deployed for development. However, with the deepening of SAGD development, the circulation preheating effect of the well group gradually deteriorated, and the oil production decreased significantly. [0003] Aiming at the problem of declining oil production, the geological and logging data of heavy oil reservoirs were analyzed comprehensively, and it was found that Fengcheng super heavy oil reservoirs are Jurassic continental deposits, and there are a large number of lenses in the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22E21B43/24E21B43/16
CPCE21B43/16E21B43/166E21B43/24
Inventor 林伯韬刘星金衍侯冰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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