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High-temperature-resisting emulsified acid liquid

A technology of emulsified acid and high temperature resistance, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of emulsified acid system application limitations, structural damage, etc., and achieve good stability and high temperature resistance.

Inactive Publication Date: 2014-12-10
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current domestic emulsified acid system is unstable at high temperature (>100°C), and the structure is damaged, which ultimately leads to the limitation of the application of the emulsified acid system

Method used

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  • High-temperature-resisting emulsified acid liquid
  • High-temperature-resisting emulsified acid liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] In parts by mass, 21 parts of NCCR emulsifier (OP-414.4 parts, OP-103.6 parts, Span-803 parts), 2.5 parts of corrosion inhibitor (heptadecenyl aminoethyl imidazoline) are poured into 76.5 parts-10 # In diesel oil, stir for 20 minutes to fully mix the emulsifier and diesel oil to form the oil phase.

[0014] In parts by mass, pour 3.3 parts of iron ion stabilizer (EDTA) into 96.7 parts of 20wt% hydrochloric acid, and stir for 5 minutes to completely mix the hydrochloric acid and iron ion stabilizer to form an acid phase.

[0015] Pour the oil phase into a three-necked flask, and slowly add 70 parts of the acid phase to 30 parts of the oil phase at a speed of 2000 r / min. The time for adding the acid phase is kept at about 5 minutes. After the acid phase is completely added, stir for another 20 minutes to obtain a stable emulsified acid solution.

Embodiment 2

[0017] In parts by mass, pour 8 parts of NCCR emulsifier (OP-45.6 parts, OP-101.4 parts, Span-801 parts), 8 parts of corrosion inhibitor (1-aminoethyl-2-octadecylimidazoline) into Put it into 84 parts of 0# diesel oil and stir for 20 minutes to make the emulsifier and diesel oil fully mixed to form the oil phase.

[0018] In parts by mass, pour 4 parts of iron ion stabilizer (citric acid) into 96 parts of 20wt% hydrochloric acid, stir for 5 minutes, and completely mix the hydrochloric acid and iron ion stabilizer to form an acid phase.

[0019] Pour the oil phase into a three-necked flask, and slowly add 50 parts of the acid phase to 50 parts of the oil phase at a speed of 2000 r / min, and the time for adding the acid phase is kept at about 5 minutes. After the acid phase is completely added, stir for another 20 minutes to obtain a stable emulsified acid solution.

Embodiment 3

[0021] In parts by mass, pour 21 parts of NCCR emulsifier (OP-46.6 parts, OP-106.1 parts, Span-808.3 parts), 2.5 parts of corrosion inhibitor (1-aminoethyl-2-hexadecylimidazoline) Add 76.5 parts of 0# diesel oil and stir for 20 minutes to fully mix the emulsifier and diesel oil to form the oil phase.

[0022] In parts by mass, pour 2 parts of iron ion stabilizer (citric acid) into 98 parts of 20wt% hydrochloric acid and stir for 5 minutes to completely mix the hydrochloric acid and iron ion stabilizer to form an acid phase.

[0023] Pour the oil phase into a three-necked flask, and slowly add 70 parts of the acid phase to 30 parts of the oil phase at a speed of 2000 r / min. The time for adding the acid phase is kept at about 5 minutes. After the acid phase is completely added, stir for another 20 minutes to obtain a stable emulsified acid solution.

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Abstract

The invention provides a high-temperature-resisting emulsified acid liquid, and aims at the acidification transformation of carbonate rocks. The emulsified acid liquid comprises oil phase and acid phase in parts by mass (100 parts in total), including 30-50 parts of oil phase and 50-70 parts of acid phase; in terms of 100 parts by mass, the oil phase comprises the following components: 8-21 parts of emulsifier, 2-8 parts of corrosion inhibitor and the balance of diesel oil; and in terms of 100 parts by mass, the acid phase comprises the following components: 2-4 parts of ferric ion stabilizer and the balance of concentrated hydrochloric acid. The emulsified acid liquid is an oil-wrapped acid emulsified liquid and is good in stability and temperature resistance, and the temperature resistance capability can be 120 DEG C.

Description

technical field [0001] The invention belongs to the field of chemical products for oil and gas well development, in particular to high temperature resistant emulsified acid liquid. Background technique [0002] The acidizing transformation of carbonate reservoirs has a fast reaction speed and cannot form long acid-etched fractures. In order to solve this problem, experts at home and abroad have proposed an emulsified acid solution system, which is a mixture of oil phase and acid phase. The oil-in-acid emulsion has the main advantages of high viscosity, small fluid loss, good retarding performance, and can produce longer acid-etched fractures or larger pores, so it has become the first choice for carbonate reservoir reconstruction. Important acid system. However, the current domestic emulsified acid system is unstable at high temperature (>100°C), and its structure is damaged, which ultimately limits the application of emulsified acid system. [0003] A high-temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74
CPCC09K8/74C09K8/604C09K8/725
Inventor 袁青贾红站牛增前李军李文杰王云云毕研霞
Owner CNPC BOHAI DRILLING ENG