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Acidification and profile control integrated method

A technology of profile control and acidizing treatment, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc. It can solve problems such as inability to control inter-layer, intra-layer and plane conflicts, unable to reduce water injection pressure, increase water injection pressure, etc. , to achieve the effect of improving the water injection development effect, shortening the pressure relief time and operation time, and removing the clogging effect

Inactive Publication Date: 2014-12-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Acidizing can relieve stratum clogging and reduce water injection pressure, but cannot control interlayer, intralayer and plane contradictions; profile control can control interlayer, intralayer and plane contradictions, but cannot remove clogging, not only cannot reduce water injection pressure, but will increase water injection pressure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The way of injection at one mouth is positive injection, daily water injection 50m 3 / d. Water injection wells with an initial water injection pressure of 18.40MPa, a current water injection pressure of 25.82MPa, and a trunk line pressure of 31MPa are treated by the acidification profile control integrated method of the present invention, which will be described in detail.

[0051] The injection time of this well is not long, and the injection pressure rises rapidly. In order to ensure normal water injection after profile control and control the rising rate of water injection pressure, it was decided to adopt an integrated method of acidification profile control for treatment. From the analysis of water absorption profile, indicator curve, pressure drop curve and other data, the reservoir is produced unevenly in the vertical direction, and there is a high water absorption layer. Therefore, the implementation mode of "profile control first, then acidification, and final...

Embodiment 2

[0061] The way of injection at one mouth is normal injection, daily water injection 90m 3 / d. Water injection wells with an initial water injection pressure of 13.00MPa, a current water injection pressure of 26.07MPa, and a trunk line pressure of 31MPa are treated by the acidification profile control integrated method of the present invention, which will be described in detail.

[0062] The water injection pressure of this well has risen greatly, and the profile control has been carried out twice before, and the water injection pressure will rise by more than 3 MPa every time it is adjusted, there is a possibility of profile control agent clogging; at the same time, there is also the clogging pollution of suspended solids in the injected water and workover fluid The analysis shows that the blockage near the wellbore is relatively serious. In order to ensure normal water injection after profile control and control the rising rate of water injection pressure, it was decided to a...

Embodiment 3

[0074] The way of injection at one port is positive injection, daily water injection 150m 3 / d, the water injection well with initial water injection pressure of 12MPa, current water injection pressure of 21MPa, and trunk line pressure of 23MPa is treated by the acidification and profile control integrated method of the present invention as an example, and will be described in detail.

[0075] The injection pressure of this well increases. In order to ensure normal water injection after profile control and control the rising rate of water injection pressure, it was decided to adopt an integrated method of acidification profile control for treatment. From the analysis of data such as water absorption profile, indicator curve, pressure drop curve, production dynamics, and injection-production correspondence, the vertical production of the reservoir is relatively balanced, but there are certain plane contradictions. Therefore, the implementation mode of "acidification first, the...

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Abstract

The invention relates to an acidification and profile control integrated method. The method includes the following steps of analyzing the development history of oil deposit and the current situation of a water injection well, and screening a high-pressure water injection well; conducting acidification processing, wherein acid liquid matched with a target stratum is rapidly injected into the stratum through a high-pressure pump truck on the premise of the pressure lower than the stratum breakage pressure, the acid liquid is made to permeate the stratum to corrode blocking objects in hole gaps, hole space is enlarged, the diversion capacity of the stratum is restored or improved, and the water injection pressure is reduced; conducting profile control processing, wherein acid-resistant profile control agents are injected into the target stratum, highly-permeable bands with the high water absorption capacity are blocked, and a permeation channel where water is injected is changed. By means of the acidification and profile control integrated method, profile control is conducted on high-pressure water injection caused by pollutant blockage in the immediate vicinity of wellbore, the aim of improving water injection developing effect is achieved, and it is ensured that water injection can still be normally executed after profile control.

Description

technical field [0001] The invention relates to a profile control method for high-pressure water injection wells during oil field development. The scope of application is profile control of high-pressure water injection wells near the wellbore due to factors such as clay swelling, water injection pollution, and multiple rounds of profile control. Background technique [0002] At present, water injection development is the main method for the development of most oil reservoirs in my country. In the process of water injection development, affected by factors such as reservoir heterogeneity, injection and production methods, etc., the injected water rushes along the high-permeability strip, resulting in water injection swept volume changes. Small, the effect of water injection development will be worse. Profile control is to block the high-permeability zone of the injected water, so that the subsequent injected water will flow around, thereby increasing the swept volume of wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/20
Inventor 李建军李才雄李之燕侯立朋熊英纪彦丽张传干邓鲁强田建儒林云张家良李红平任建芳郭艳艳郭富刚
Owner PETROCHINA CO LTD
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