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Acid fluid dosage optimization method for online acidification of water injection well

An optimization method and technology for water injection wells, applied in earthwork drilling, wellbore/well components, production fluids, etc., can solve the problems of not considering the well conditions of water injection wells, reservoir characteristics, and the unreasonable amount of acid solution, etc. Achieving good acidizing effect and improving oil recovery

Active Publication Date: 2020-07-10
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional empirical formulas are still used for the amount of acid liquid at present, without considering the well conditions of the water injection well itself, reservoir characteristics, etc., and the amount of acid liquid cannot be reasonably given according to the actual situation of each well

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This example provides a method for optimizing the amount of acid liquid used in the online acidizing construction of a water injection well.

[0024] The well is a water injection well in the Chang 8 layer of Jiyuan Oilfield. The permeability of the well is 0.56mD, which belongs to the ultra-low permeability reservoir; the cumulative water injection volume is 13,875 cubic meters; the injection time is 1 year and 8 months; the injection medium is clean water; the early stage Stimulation measures have not been taken; the acidification radius is set to 3 meters; the oil layer thickness of the well is 8 meters; the reservoir porosity is 12%.

[0025] It is planned to carry out online acidizing construction for this well, according to the injection acid volume formula V=(ABCDE)πφr of the present invention 2 h to calculate. Where A=1.2, B=1.1, C=1.1, D=1, E=0.85; φ=12%, h=8, r=3, then V=1.2×1.1×1.1×1×0.85×3.14×0.12 ×9×8=33.48(m 3 ).

[0026] Therefore, the amount of acid ...

Embodiment 2

[0029] This example provides a method for optimizing the amount of acid liquid used in the online acidizing construction of a water injection well.

[0030] The well is a water injection well in the Chang 2 layer of Jing'an Oilfield. The permeability of the well is 10.2mD, which belongs to the low permeability reservoir; the cumulative water injection volume is 25,875 cubic meters; the injection time is 3 years and 2 months; the injection medium is produced water; the early stage Two injection enhancement measures have been carried out; the acidizing radius is set to 2.5 meters; the oil layer thickness of the well is 10 meters; the reservoir porosity is 16%.

[0031] It is planned to carry out online acidizing construction for this well, according to the injection acid volume formula V=(ABCDE)πφr of the present invention 2 h to calculate. Where A=0.8, B=1.2, C=1.2, D=1.2, E=1.1; φ=16%, h=10, r=2.5, then V=0.8×1.2×1.2×1.2×1.1×3.14×0.16 ×6.25×10=47.75(m 3 ).

[0032] Therefo...

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PUM

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Abstract

The invention discloses an acid fluid dosage optimization method for online acidification of a water injection well. The acid fluid dosage optimization method comprises the steps: (a) the reservoir permeability of the to-be-acidified water injection well is determined and subjected to grade division, and different grades correspond to different coefficients A; (b) the cumulative water injection rate of the water injection well is determined and subjected to grade division, and different grades correspond to different coefficients B; (c) the injection time of the water injection well is determined and subjected to grade division, and different grades correspond to different coefficients C; (d) injection media of the water injection well are determined, and the different injection media correspond to different coefficients D; (e) the cumulative number of times of measures in the early stage of the water injection well is determined, and different numbers of times correspond to differentcoefficients E; (f) the acidizing radius r is determined, the reservoir thickness h is determined, and the reservoir porosity phi is determined; and (g) an injection acid volumetric model V is determined, the final acid fluid dosage is determined, and online acidification is conducted according to the dosage, wherein V=(ABCDE) pi phi r 2h.

Description

technical field [0001] The invention belongs to the technical field of oil field exploitation, and in particular relates to a method for optimizing the amount of acid liquid used in online acidification of water injection wells. Background technique [0002] Acidizing technology is one of the widely used oil and gas well stimulation measures at present, which can effectively remove the damage to the reservoir during drilling, completion and production, and increase oil and gas production. Conventional acidizing is to inject a certain type and concentration of acid solution and a formula acid solution composed of additives into the reservoir in a certain order to dissolve some minerals in the formation rock or blockages in the pores and fractures, improve the permeability of the formation or fractures, and improve the seepage conditions , to achieve the purpose of restoring or increasing the productivity of oil and gas wells. [0003] However, according to the actual constru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/27E21B43/20E21B49/00
CPCE21B43/26E21B43/20E21B49/00
Inventor 王勇慕立俊巨亚锋张随望陆小兵宋昭杰隋蕾邓志颖王尔珍王俊涛
Owner PETROCHINA CO LTD