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Heavy acid-fluid formula

An acid solution and formulation technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high wellhead pressure, aggravation, and inability to complete acid fracturing, and achieve low surface tension, good compatibility and good performance. Compatibility effect

Active Publication Date: 2007-04-04
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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Examples

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] 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

0.6

Acid Corrosion Inhibitor

DJ-04

30

3

demulsifier

FRZ-4

10

1

Iron ion stabilizer

KMS-7

10

1

Drainage aid

DJ-02

10

1

[0018] 2. Test the corrosion performance of this acidizing solution: use the acid solution configured above to evaluate the corrosion performance of the aggravated acidizing solution according to the SY / T5405-1996 standard. Test conditions: airtight container; temperature 120°C. Experimental results The corrosion rate is 22.34g / m 2 .h.

[0019] 3. Test the rheological pro...

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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 Applications(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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