Low-carbon mixed organic acid used for oil well plug removal, preparation method and application thereof

A technology for mixing organic acids and oil wells, which is applied in chemical instruments and methods, earthwork drilling and production, wellbore/well components, etc. It can solve the problems of obtaining synthetic low-carbon mixed organic acid raw materials, reservoir clogging, and lack of economic feasibility, etc. question

Active Publication Date: 2013-07-31
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Low-carbon mixed organic acid plugging removal technology is a major scientific research project of Liaohe Oilfield Company in 1996. The main technical principle is to start from the analysis of the cause of oil well plugging, and meet the reservoir compatibility requirements, use liquid wax cracking to synthesize low-grade fatty acids, or use The liquid wax saponification reaction synthesizes washing powder and soap backdistillation waste liquid. According to the principle of similar miscibility and oxidation addition reaction, a composite oil well deblocking and production increasing agent is developed. This technology has achieved significant production increasing effect through field application, and has At the beginning of 1997, the national invention patent was declared. However, at the end of 1997, due to the city's health, safety, environmental protection requirements and equipment process update, Dalian Oleochemical Factory and Shenyang Oleochemical Factory moved out of the urban area successively, and the newly established Oleochemical Factory was no longer in use. Liquid wax pyrolysis method to synthesize soap, washing powder or low-level fatty acids, that is, it is impossible to obtain raw materials for synthesizing low-carbon mixed organic acids from oleochemical factories, and it is not economically feasible to synthesize low-carbon mixed organic acids by simply using liquid wax cracking
[0003] In the middle and late stages of Liaohe Oilfield development, as the formation crude oil is extracted, heavy components such as asphalt, colloid, wax, etc. stay and absorb the surrounding wells, causing serious plugging of the reservoir, while conventional plugging removal technologies (hydrochloric acid, soil acid, compound plugging remover) did not achieve a significant increase in production

Method used

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  • Low-carbon mixed organic acid used for oil well plug removal, preparation method and application thereof
  • Low-carbon mixed organic acid used for oil well plug removal, preparation method and application thereof
  • Low-carbon mixed organic acid used for oil well plug removal, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Embodiment 1 (processing radius 2.0 meters, throughput rounds less than 5 rounds):

[0077] Synthesis of 10 square low carbon mixed organic acid solution embodiment:

[0078] The ratio of organic acid raw materials by mass:

[0079] Fatty alcohol (dodecanol): ethylene oxide: dodecylbenzenesulfonic acid: sulfamic acid: oxalic acid: biuret: furazolidone: 3-benzofuranone: sodium nitrite = 0.5: 0.25: 0.5: 3.5:2.5:0.5:1.0:1.0:0.25;

[0080] 1. Quantitatively prepare each reagent according to the ratio;

[0081] 2. Check whether a reaction kettle (1 square) and two chemical mixing tanks (10 squares) are in working condition, and whether the water for dosing is smooth;

[0082] 3. Add 50kg of dodecyl alcohol and 25kg of ethylene oxide quantitatively into the reactor, stir evenly (60 rpm) for 10 minutes, raise the temperature of the reactor to 105°C, react for 90 minutes under uniform stirring, and then cool down to room temperature, then slowly add quantitative 50kg of dod...

Embodiment 2

[0090] Embodiment 2 (processing radius 2.5 meters, throughput rounds 5-10 rounds):

[0091] Synthesis of 10 square low carbon mixed organic acid solution embodiment:

[0092] The ratio of organic acid raw materials by mass:

[0093] Fatty alcohol (n-hexanol): ethylene oxide: tridecylbenzenesulfonic acid: sulfamic acid: oxalic acid buffer: biuret: furazolidone: 3-benzofuranone: sodium nitrite = 0.5: 0.25: 0.25: 3.5:2.75:0.5:1.0:1.0:0.25;

[0094] 1. Quantitatively prepare each reagent according to the ratio of the medicine;

[0095] 2. Check whether a reaction kettle (1 square) and two chemical mixing tanks (10 squares) are in working condition, and whether the water for dosing is smooth;

[0096] 3. Add 50kg of fatty alcohol and 25kg of ethylene oxide weighed quantitatively into the reactor, stir evenly (60 rpm) for 10 minutes, heat up the reactor to 105°C, react for 90 minutes under uniform stirring, and then cool to room temperature, and then slowly add a quantitative am...

Embodiment 3

[0104] Embodiment 3 (processing radius 3.0 meters, throughput rounds more than 10 rounds):

[0105] Synthesis of 10 square low carbon mixed organic acid solution embodiment:

[0106] The ratio of organic acid raw materials by mass:

[0107] Fatty alcohol (n-octanol): ethylene oxide: n-pentylbenzenesulfonic acid: sulfamic acid: oxalic acid: biuret: furazolidone: 3-benzofuranone: sodium nitrite = 0.25: 0.25: 0.75 :3.75:2.75:0.5:0.75:0.75:0.25;

[0108] 1. Quantitatively prepare each reagent according to the ratio of the medicine;

[0109] 2. Check whether a reaction kettle (1 square) and two chemical mixing tanks (10 squares) are in working condition, and whether the water for dosing is smooth;

[0110] 3. Add 25kg of fatty alcohol and 25kg of ethylene oxide weighed quantitatively into the reactor, stir evenly (60 rpm) for 10 minutes, raise the temperature of the reactor to 105°C, react for 90 minutes under uniform stirring, and then cool to room temperature, and then slowly...

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Abstract

The invention relates to a low-carbon mixed organic acid used for oil well plug removal, a preparation method and an application thereof. The low-carbon mixed organic acid is prepared from the following raw materials by mass percent: 4-6 % of fatty alcohol, 2.4-2.5 % of ethylene oxide, 4-6 % of alkylbenzenesulfonate, 34-36 % of sulfamic acid, 24-26 % of oxalic acid, 4-6 % of biuret, 8-12 % of furazolidone, 8-12 % of 3-benzofuranone and 2.4-2.6 % of sodium nitrite. The low-carbon mixed organic acid is mainly used in a late stage of heavy oil throughput in Liaohe oilfield so as to improve single well production, especially to remove oil reservoir plug during each throughput, and is relatively substantial in improving steam throughput exploitation effects.

Description

technical field [0001] The invention relates to a low-carbon mixed organic acid for oil well plugging removal and its preparation method and application. Background technique [0002] Low-carbon mixed organic acid plugging removal technology is a major scientific research project of Liaohe Oilfield Company in 1996. The main technical principle is to start from the analysis of the cause of oil well plugging, and meet the reservoir compatibility requirements, use liquid wax cracking to synthesize low-grade fatty acids, or use The liquid wax saponification reaction synthesizes washing powder and soap backdistillation waste liquid. According to the principle of similar miscibility and oxidation addition reaction, a composite oil well deblocking and production increasing agent is developed. This technology has achieved significant production increasing effect through field application, and has At the beginning of 1997, the national invention patent was declared. However, at the e...

Claims

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Application Information

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IPC IPC(8): C09K8/524E21B37/06
Inventor 张玉涛刘喜林张洪君马春宝王浩龙华向延安韩松岳玉全赵剑飞刘晓妍袁爱武刘武友张建军周长城张俊张立萍于俊梅郝瑞辉陈莹
Owner PETROCHINA CO LTD
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