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A method of injecting oil displacement agent into oil layer by fracturing to enhance recovery

An oil-displacing agent and recovery factor technology, applied in chemical instruments and methods, production fluids, earth-moving drilling, etc., can solve the problems of low injection efficiency, large loss of extended-range viscosity, etc. Increased production and obvious economic benefits

Active Publication Date: 2019-04-09
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention overcomes the problems of large viscosity loss and low injection efficiency during the injection process of the existing three types of oil-reservoir oil-displacement agents in the background technology, and provides a method for injecting oil-displacement agents into oil layers by fracturing to improve recovery

Method used

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  • A method of injecting oil displacement agent into oil layer by fracturing to enhance recovery
  • A method of injecting oil displacement agent into oil layer by fracturing to enhance recovery
  • A method of injecting oil displacement agent into oil layer by fracturing to enhance recovery

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Embodiment 1

[0021] The present invention will be further described in conjunction with well B1-26-E33 of the third type of reservoir in Daqing Changyuan. Well B1-26-E33 is an old well produced by ASP flooding and was completed on October 1, 2008. The oil-water well spacing of this well is 125m, the well depth is 1155.8m, the perforated section depth is 1009.6-1062.3m, and a total of 15 sublayers are drilled from Sa II1 to Sa III10.

[0022] (1) Divide well B1-26-E33 fracturing stuck section:

[0023] According to the result of fine description of the reservoir, combined with the interpretation and evaluation of cementing quality, perforation and interlayer, the 15 sublayers of the well were divided into 6 intervals for oil displacement hydraulic fracturing injection construction; the 6 intervals are respectively : Sa II 12 1 , Sa II 14 1 ~SaⅢ1, SaⅢ2~SaⅢ3 2 , SaⅢ5+6 2 , SAⅢ8, SAⅢ9~10 1 .

[0024] (2) Determine the fracturing half-fracture length of the 6 target intervals in Well B1-...

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Abstract

The invention relates to a method for injecting oil displacing agent into an oil reservoir to improve oil recovery by using fracturing. The method for injecting the oil displacing agent into the oil reservoir to improving oil recovery by using fracturing mainly solves the problems of large viscosity loss and low injection efficiency during the injection process of the existing three kinds of oil reservoir oil displacement agents. The method for injecting the oil displacing agent into oil reservoir to improving oil recovery by using fracturing is characterized in that (1) dividing a target stratum to the well fracturing section; (2) determining a half fracture length for the well fracturing section of the target stratum; (3) determining the oil displacement agent dosage for the well fracturing section of the target stratum; (4) determining a construction displacement the well fracturing section; (5) determining construction procedure of a pumping injection; and (6) mixing and injecting the oil displacement agent. The method for injecting the oil displacing agent into oil reservoir to improving oil recovery by using fracturing can greatly improve the injection efficiency and reduce the displacement efficiency loss, thus greatly improve the recovery efficiency and single well production.

Description

Technical field: [0001] The invention relates to the technical field of petroleum exploitation, in particular to a method for injecting an oil-displacing agent into an oil layer by fracturing to increase recovery. Background technique: [0002] With the increasing shortage of oil resources, major oil fields continue to develop and apply large-scale fracturing technology as the main production increase measure. At present, after many years of water flooding development in most oil fields, most of the main oil layers have been used, and the recovery rate of crude oil has been greatly improved through tertiary oil recovery. However, there are still a lot of remaining oil that cannot be effectively produced. For example, the remaining oil that cannot be effectively produced in Daqing Oilfield is still more than 50%. At present, the development targets are transferred to the third type of oil layers with more remaining reserves. This type of reservoir has many layers and pores. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22E21B43/26C09K8/68C09K8/58
CPCC09K8/58C09K8/602C09K8/68E21B43/16E21B43/26
Inventor 万军孙智汪玉梅王洪卫白文广莫爱国杨光李扬成康少冬张国军
Owner PETROCHINA CO LTD
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