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High temperature-resistant high-mineralization degree foam scrubbing agent and its preparation method and use

A technology of foaming agent and surfactant, which is applied in the field of oil and gas exploitation, can solve the problems that are rarely reported, and achieve the effect of simple composition, good position adaptability, and enhanced compactness

Active Publication Date: 2015-10-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main component of foaming agents is surfactants. The current research on foaming agents is mainly through the compounding of surfactants. However, most of these compoundings focus on the relationship between anionic surfactants and anionic surfactants. , between anionic surfactants and zwitterionic surfactants, but there are few reports on the research between anionic surfactants and cationic surfactants

Method used

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  • High temperature-resistant high-mineralization degree foam scrubbing agent and its preparation method and use
  • High temperature-resistant high-mineralization degree foam scrubbing agent and its preparation method and use
  • High temperature-resistant high-mineralization degree foam scrubbing agent and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment provides a high-temperature-resistant, high-salinity foam unloading agent and a preparation method thereof. The preparation method comprises the following steps:

[0031] 1) preparation of Gemini cationic surfactant

[0032] Separately mix 2g of dodecyldimethylammonium bromide, tetradecyldimethylammonium bromide, hexadecyldimethylammonium bromide, octadecyldimethylammonium bromide with 4mL of 1, 2-Dibromoethane (in excess to ensure that the reaction is fully completed) was dissolved in absolute ethanol (50 mL), and refluxed at about 80 ° C for 48 h. The reacted mixture was spin-dried at 37°C on a rotary evaporator to obtain Gemini cationic surfactants with m=12, 14, 16, and 18 respectively; the structure of the Gemini cationic surfactant is shown in formula I

[0033]

[0034] Wherein, in the present embodiment, the Gemini cationic surfactant is mixed according to the mass ratio of 1:1:3:1 by the Gemini cationic surfactant of above-mentioned m=12,14...

Embodiment 2

[0039] This embodiment provides a foaming agent with high temperature resistance and high salinity and its preparation method. The preparation method comprises the following steps:

[0040] 1) preparation of Gemini cationic surfactant

[0041] Separately mix 2g of dodecyldimethylammonium bromide, tetradecyldimethylammonium bromide, hexadecyldimethylammonium bromide, octadecyldimethylammonium bromide with 4mL of 1, 2-Dibromoethane (in excess to ensure that the reaction is fully completed) was dissolved in absolute ethanol (50 mL), and refluxed at about 80 ° C for 48 h. The reacted mixture was spin-dried at 37°C on a rotary evaporator to obtain Gemini cationic surfactants with m=12, 14, 16, and 18 respectively; the structure of the Gemini cationic surfactant is shown in formula I

[0042]

[0043] Wherein, in the present embodiment, the Gemini cationic surfactant is mixed according to the mass ratio of 1:1:3:1 by the Gemini cationic surfactant of above-mentioned m=12,14,16,...

Embodiment 3

[0048] This example is aimed at the initial foaming volume V of the foaming agent GWJ-1 provided in the above example 1 under different temperature and salinity conditions 0 , foam half-life t 1 / 2 And the liquid carrying capacity of 15 minutes when the air flow rate is 5L / min was tested, and the performance of a domestic commercially available foam discharge agent 1 and 2 was compared under the same test conditions.

[0049]The instrument used in the test process is a high temperature and high pressure foam evaluation instrument (this high temperature and high pressure foam evaluation instrument is the high temperature and high pressure foam evaluation instrument recorded in the utility model patent of patent number ZL201120400940.1, bulletin number CN202228059U); In order to analyze the water produced by the natural gas well on site, NaCl, CaCl were used. 2 , MgCl 2 , KCl, Na 2 SO 4 , NaHCO 3 Prepared.

[0050] The specific test method is as follows:

[0051] 1) Foamin...

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Abstract

The invention provides a high temperature-resistant high-mineralization degree foam scrubbing agent and its preparation method and use. The high temperature-resistant high-mineralization degree foam scrubbing agent comprises, by mass, 15-40% of an anionic surfactant, 5-15% of a cationic surfactant and the balance deionized water. The anionic surfactant comprises fatty alcohol polyoxyethylene ether sulfate, sodium alpha-olefin sulfonate or sodium dodecyl sulfate. The cationic surfactant comprises a cationic Gemini surfactant. The invention provides a preparation method of the high temperature-resistant high-mineralization degree foam scrubbing agent. The preparation method comprises adding the anionic surfactant and the cationic surfactant into a reaction container by one step, adding deionized water into the reaction container to obtain a mixed solution, heating the mixed solution to a temperature of 50-60 DEG C and carrying out stirring to obtain the foam scrubbing agent. The foam scrubbing agent solves the problem that the existing foam scrubbing agent has suddenly reduced foam properties in temperature and mineralization degree increasing and can be used for a draining and gas production technology of a deep high temperature high-mineralization degree gas well.

Description

technical field [0001] The invention relates to a foaming agent with high temperature resistance and high salinity, a preparation method and application thereof, and belongs to the field of oil and gas exploitation. Background technique [0002] With the deepening of gas field development, most gas fields have entered the middle and later stages of development. Due to the continuous decline of formation pressure, edge water advances and bottom water rises. Liquid, will cause the gas cylinder to reduce production or even stop spraying. In view of this situation, it is necessary to carry out drainage and gas recovery technology in time to solve the problem of gas well drainage. Among them, the foam drainage gas recovery technology has become the first choice of drainage gas recovery technology because of its good effect, convenient construction and relatively low cost. The foam drainage gas recovery process is to inject the foam drainage agent into the production well with i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584E21B43/22
CPCC09K8/584E21B43/16
Inventor 武俊文熊春明雷群张建军曹光强李隽李楠王云贾敏刘岩何春艳
Owner PETROCHINA CO LTD
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