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Converted production well pretreating agent suitable for middle-low-permeability reservoir and preparation method

A pretreatment agent and oil seepage technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of low biodegradation rate, long construction time, impossibility of implementation, etc., achieve high degree of biodegradation, avoid secondary Secondary pollution and reduced construction time

Inactive Publication Date: 2016-11-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This makes the current pretreatment agent have the following disadvantages: 1, the anionic surfactant is not resistant to high salinity, if the water-sensitive critical salinity of the reservoir is higher (above the anionic surfactant salinity resistance) or Ca 2+ , Mg 2+ If the plasma content is high, the process cannot be implemented; 2. The interfacial tension of most pretreatment agents is at 10 -1 About mN / m, it is effective for high-permeability, medium-to-high-permeability reservoirs, etc., but the treatment effect on medium-to-low and low-permeability trans-injection wells is unsatisfactory and even causes secondary damage (precipitation and emulsification damage after the two surfactants are mixed) ); 3, the biodegradation rate of the current pretreatment agent is low, generally below 60%, which has great damage to the environment and natural organisms; 4, the surfactant for treating residual oil and water-sensitive minerals cannot be mixed, and it needs to be separated The section is squeezed into the ground, and the construction time on site is longer

Method used

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  • Converted production well pretreating agent suitable for middle-low-permeability reservoir and preparation method
  • Converted production well pretreating agent suitable for middle-low-permeability reservoir and preparation method
  • Converted production well pretreating agent suitable for middle-low-permeability reservoir and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 10 kg of KCl or NH 4 Cl, first add 30 kg of Cl with the molecular formula (C 7 h 18 2N2Br) n , n=2~5 small cationic polyquaternium clay stabilizer, then add 1 kg of APG0810 nonionic surfactant, then add 60 kg of ethylene glycol monobutyl ether, stir evenly to obtain the product.

[0027] The method of use is:

[0028] (1) The clear water well fluid used to prepare the treatment agent solution is finely filtered through the fiber composite membrane to ensure that the solid phase particle diameter and solid phase content of the well fluid meet the standards of the petroleum and natural gas industry of the People's Republic of China "SY / T 5329-2012 Injection water quality indicators and analysis methods for clastic rock reservoirs "Recommended main control indicators of water quality in 4.2";

[0029] (2) Requirements for the temperature of the entering well fluid: for crude oil with a freezing point above 0°C, the temperature of the entering well fluid should be ...

Embodiment 2

[0033] Take 20 kg of KCl or NH 4 Add Cl to 10 kg of water, mix well under the condition of temperature of 0°C and stirring speed of 10 r / min, then continue stirring, first add 1 kg of water with the molecular formula (C 7 h 18 2N2Br) n , n=2~5 small cationic polyquaternium clay stabilizer, then add 10 kg of APG0810 nonionic surfactant, finally add 40 kg of ethylene glycol monobutyl ether, stir evenly to obtain the product.

[0034] The method of use is:

[0035] (1) The clear water well fluid used to prepare the treatment agent solution is finely filtered through the fiber composite membrane to ensure that the solid phase particle diameter and solid phase content of the well fluid meet the standards of the petroleum and natural gas industry of the People's Republic of China "SY / T 5329-2012 Injection water quality indicators and analysis methods for clastic rock reservoirs "Recommended main control indicators of water quality in 4.2";

[0036] (2) Requirements for the tempe...

Embodiment 3

[0040] First, 15 kg of KCl or NH 4 Add Cl into 5 kg of water, mix well at a temperature of 15°C and a stirring speed of 7 r / min, then continue to stir, first add 15 kg of water with the molecular formula (C 7 h 18 2N2Br) n , n=2~5 small cationic polyquaternium clay stabilizer, then add 5 kg of APG0810 nonionic surfactant, finally add 50 kg of ethylene glycol monobutyl ether, stir evenly to obtain the product.

[0041] The method of use is:

[0042] (1) The well-entry fluid used to prepare the treatment agent solution comes from oilfield sewage, and the oilfield sewage undergoes solid phase sedimentation, multi-layer filter material filtration and multi-stage filtration of fiber composite membrane after degreasing. Ensure that the solid particle diameter and solid content of the well fluid reach the main control indicators recommended in 4.2 of the Petroleum and Natural Gas Industry Standard of the People's Republic of China "SY / T 5329-2012 Injection Water Quality Indicators...

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Abstract

The invention discloses a converted production well pretreating agent suitable for a middle-low-permeability reservoir and a preparation method and belongs to the field of pretreatment of converted production wells of reservoirs. The converted production well pretreating agent is prepared from, by weight, 1-10 parts of nonionic surfactant, 1-30 parts of small cationic poly quaternary ammonium salt clay stabilizer, 40-60 parts of assistant, 10-20 parts of KCl or NH4Cl and 0-10 parts of water. The pretreating agent has low oil-water interfacial tension, can effectively treat residual oil in the immediate wellbore vicinity of the middle-low-permeability reservoir without emulsion damage formation and is high in salinity, the salt tolerance is greater than or equal to 80000 mg / L, the biodegradation rate is 90% or above, and the environmental pollution is greatly reduced.

Description

Technical field: [0001] The invention provides a transfer injection well pretreatment agent, in particular a transfer injection well pretreatment agent suitable for medium and low permeability reservoirs and a preparation method thereof. Background technique: [0002] With the large-scale development of oil, water injection has become the main way to replenish formation energy in many oil fields, and many water injection wells are transfer injection wells adjusted by oil wells, and there will be a certain amount of residual oil in the vicinity of the injection wells, and most of them are low-to-medium Seepage reservoirs contain a certain amount of water-sensitive minerals. [0003] Especially during pretreatment, since the surfactant for treating residual oil is generally anionic, and the surfactant for treating water-sensitive minerals is cationic, the two surfactants cannot be mixed and need to be squeezed in separately. This makes the current pretreatment agent have the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 李建兵汪庐山杜宝坛张星赵洪涛宋欣姜慧张君陈丽霞李强张磊刘涛刘恒
Owner CHINA PETROLEUM & CHEM CORP
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