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Lower damage acidification system for high temperature carbonate reservoir

A carbonate reservoir, high-temperature technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of pipe string corrosion damage, tubing string corrosion, accidents, etc., and achieve the effect of improving the quality of acidizing

Active Publication Date: 2006-07-05
DAGANG OIL FIELD GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, acidizing is one of the favorable measures for increasing production of carbonate reservoirs. Usually, hydrochloric acid and organic acid are used to prepare the acidizing fluid, and corrosion inhibitors, iron ion stabilizers, However, such an acidizing process has obvious defects for high-temperature oil wells, which are mainly manifested in ① due to high temperature, the acid liquid will seriously corrode the tubing string, which may cause accidents, and the corrosion damage of the tubing string will cause the well to fall Dangerous; ②A large amount of dissolved iron ions enter the formation, causing potential damage to the formation; ③The reaction speed between the acid liquid and the formation rock near the wellbore is too fast, and the acid concentration decreases for a short time. When hydrochloric acid reacts with carbonatite, the hydrochloric acid will drop to the concentration of residual acid in only 20 minutes, which makes it difficult to acidify the deep formation and affect the acidizing effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1, adopts PCl 3 As the main liquid, kerosene is used as the spacer, and water is used as the activator. In order to prevent the reaction from forming precipitates and affecting the acidification effect, sodium hexametaphosphate is added to the water (activator).

[0022] In the implementation chamber, determine the body fluid PCl 3 The test concentration is 10%, that is, the weight percentage after the body liquid is mixed with a sufficient amount of activator is 10%, and sodium hexametaphosphate (crystal modifier) ​​accounting for 1% of water (activator) gross weight is added in the activator.

[0023] in 10% hydrochloric acid and select PCl 3 Comparing the acidizing effect of the same core in the case of main liquid:

[0024] serial number

[0025] Tests have proved that the acidification system of the present invention has a higher corrosion rate than that of hydrochloric acid under the same dosage.

Embodiment 2

[0026] Embodiment 2, adopts PCl 5 or POCl 3 When making the main agent, it is necessary to mix the solid powder-like main agent into kerosene (carrying liquid) to make the main liquid, and then carry out acidification construction according to the acidification process steps.

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Abstract

The present invention is one kind of acidifying system for high temperature carbonate reservoir and belongs to the field of the work fluid for development of hydrocarbon reservoir. The acidifying system consists of main fluid selected from PCl3,PCl5 and POCl3; activating agent water; and isolating fluid light oil. The corresponding acidifying technological process includes first injection of certain amount of isolating fluid, and subsequent circular injection of main fluid, isolating fluid and activating agent. The said stratum acidifying system and process has less corrosion of oil well column, less damage to stratum, slowed down reaction speed and reinforced deep stratum acidifying effect.

Description

technical field [0001] The invention relates to an acidification system suitable for the acidification of high-temperature carbonate rock reservoirs, which belongs to the working fluid and matching technology used in the transformation and application of oil and gas reservoirs in oilfield development. Background technique [0002] In the prior art, acidizing is one of the favorable measures for increasing production of carbonate reservoirs. Usually, hydrochloric acid and organic acid are used to prepare the acidizing fluid, and corrosion inhibitors, iron ion stabilizers, However, such an acidizing process has obvious defects for high-temperature oil wells, which are mainly manifested in ① due to high temperature, the acid liquid will seriously corrode the tubing string, which may cause accidents, and the corrosion damage of the tubing string will cause the well to fall Dangerous; ②A large amount of dissolved iron ions enter the formation, causing potential damage to the form...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/72C09K8/60
Inventor 李延美王津建贾雁
Owner DAGANG OIL FIELD GRP
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