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Heavy acid-fluid formula

A technology of acid liquid and acid liquid thickener, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of high wellhead pressure, inability to complete acid fracturing, aggravation, etc., and achieve low surface tension, good Good compatibility and compatibility

Active Publication Date: 2009-04-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Overcoming the high wellhead pressure of such wells and the difficulty of acid fracturing with current construction equipment, it is possible to successfully complete the acid fracturing construction of such special wells by using the aggravated acid liquid of the present invention and existing equipment

Method used

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  • Heavy acid-fluid formula

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The performance of the weighted acid formula system was tested separately in the laboratory.

[0016] The testing process is as follows:

[0017] 1. The configuration and density test of the aggravated acid solution: measure 325.6mL CaBr 2 Saturated solution, add 614mL31% industrial hydrochloric acid, add 6g acid thickener under stirring, stir for about 1 hour, add 30mL acid corrosion inhibitor, 10mL demulsifier, 10mL iron ion stabilizer, 10mL drainage aid agent. Stir evenly and let it stand for more than 4 hours, then the performance test can be carried out. The density test uses a densitometer, and the density of the above-mentioned acid solution is 1.35g / cm 3 . The ratio of each substance is shown in the table below:

[0018] components

Volume (mL)

Volume ratio

31% industrial hydrochloric acid

614

61.4

Inorganic salt saturated solution

CaBr 2

325.6

32.56

acid thickener

KMS-2

6

...

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Abstract

An emphasized acid liquor formula consists of 31% industrial hydrochloric acid 60-125 proportion, inorganic salt saturated solution 30-65 proportion, acid liquor gelatinizer 0.6-1.6 proportion, acid liquor corrosion inhibitor 3-5 proportion, demulsifier 1-2 proportion, ferrous ion stabilizer 1-2 proportion, and auxiliary 1-2 proportion; the emphasized fracturing liquid density is between 1.25-1.55g / cm3. It can be used to decrease construction pressure at well opening, finish oil-well fracture of deep well, super-deep well, abnormal high-pressure well and realize storage-layer transformation.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration and development oil and gas well reservoir reformation, in particular to the acid liquid used in the oil-water well acidification treatment process technology. Background technique [0002] In oil and gas exploration and development, acid fracturing technology for carbonate rock reservoirs uses the chemical dissolution of acid liquid to dissolve blockages in the formation, expand or extend formation fractures and caves, and restore and increase the permeability of the formation. It is a technical measure to reduce oil inflow resistance or water injection resistance to discover oil and gas layers, improve reserve evaluation level and improve single well productivity of oil and gas wells. With the continuous improvement of drilling technology, a number of deep wells, ultra-deep wells, abnormally high pressure wells, abnormally high geostress wells, and tight oil wells have been complet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74
Inventor 张福祥彭建新汪绪刚程兴生李元斌
Owner PETROCHINA CO LTD
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