Nano solid defoamer for foam drainage gas recovery of gas well, and preparation method thereof

A technology of solid defoaming agent and foam drainage, applied in separation methods, foam dispersion/prevention, chemical instruments and methods, etc., can solve problems such as poor defoaming effect, high cost, and weak stability, and achieve defoaming and The effect of strong antifoaming ability, wide source of raw materials and simple preparation method

Active Publication Date: 2020-10-27
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although various measures have been taken, there are still many problems in the use of emulsion defoamers, which are manifested in the following aspects: (1) The defoaming effect fluctuates; (2) The stability of emulsion defoamers after dilution is unstable Strong; (3) The injection cost of emulsi

Method used

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  • Nano solid defoamer for foam drainage gas recovery of gas well, and preparation method thereof
  • Nano solid defoamer for foam drainage gas recovery of gas well, and preparation method thereof
  • Nano solid defoamer for foam drainage gas recovery of gas well, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This embodiment provides a nano-silica particle modified with polydimethylsiloxane.

[0043] The raw material composition of the polydimethylsiloxane-modified nano silicon dioxide particles comprises:

[0044] 3g of silicon dioxide particles with a particle size of 12nm, 120mL of ammonia water with a concentration of 24wt%, 2mL of polydimethylsiloxane, 100mL of methanol and 30mL of deionized water; wherein, silicon dioxide particles, ammonia water, Both polydimethylsiloxane and methanol are analytically pure, and the resistivity of deionized water is 18MΩ·cm;

[0045]Its preparation method includes: weighing the raw materials according to the above ratio, adding silicon dioxide particles, methanol, polydimethylsiloxane and deionized water into a three-necked bottle in sequence, mixing evenly, stirring and heating at a speed of 600r / min to 60°C, react for 4 hours to obtain a mixed solution; add ammonia water to the mixed solution, continue to stir at a speed of 600r / min...

Embodiment 2

[0047] This embodiment provides a nano-solid defoamer for gas well foam drainage and gas recovery.

[0048] The raw material composition of the nano solid defoamer used for gas well foam drainage and gas recovery includes:

[0049] 1.2 g of polydimethylsiloxane-modified nano-silica particles prepared in Example 1, 21 g of simethicone oil, 2 g of emulsifier S-185 and 74 g of curing agent sucrose.

[0050] The preparation of the nano-solid defoamer for gas well foam drainage and gas recovery comprises the following steps:

[0051] Weigh the raw materials according to the above ratio, mix simethicone and polydimethylsiloxane-modified nano-silica particles evenly, heat to 240°C, stir the mixture for 4 hours at a speed of 4000r / min, and cool to 20°C to obtain the main body of the defoamer;

[0052] Heat the solidifying agent sucrose to 190°C to melt, add the main body of the defoamer and the emulsifier S-185, stir at a constant temperature of 600r / min for 1.5h, mix well, pour int...

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Abstract

The invention discloses a nano solid defoamer for foam drainage gas recovery of a gas well, and a preparation method of the nano solid defoamer, and provides a nano solid defoamer for foam drainage gas recovery of a gas well. The nano solid defoamer comprises the following raw material components in parts by weight: 12-22 parts of dimethyl silicone oil, 1-4 parts of modified silicon dioxide nanoparticles, 72-76 parts of a curing agent, and 1-4 parts of an emulsifier. The invention also provides a method for preparing the nano solid defoamer for foam drainage gas recovery of a gas well, whereinthe method comprises the following steps: 1) mixing dimethyl silicone oil and modified silicon dioxide nanoparticles, heating, stirring, and cooling to a preset temperature to obtain a defoamer mainbody; and 2) heating a curing agent until the curing agent is molten, mixing the molten curing agent, an emulsifier and the defoamer main body prepared in the step 1), and stirring at a constant temperature to obtain the nano solid defoamer for foam drainage gas recovery of the gas well.

Description

technical field [0001] The invention relates to the technical field of natural gas exploitation. More specifically, it relates to a nano-solid defoamer for gas well foam drainage and gas recovery and a preparation method thereof. Background technique [0002] With the continuation of gas field mining, formation water is also gradually increasing, and the foam drainage gas recovery process in the middle and late stages of mining has become an indispensable process to ensure continuous and stable production. An important link at the end of the foam drainage process is to eliminate foam and ensure the separation of gas and water. If the foam is not completely eliminated, it will cause many adverse effects, such as affecting the meter measurement, increasing the pipeline pressure, entering the foam in the supercharger, and the dehydration skid Into the foam knot salt etc. At present, most of the defoamers used in the field are emulsion-type silicone defoamers. Bubble tank pum...

Claims

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Application Information

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IPC IPC(8): B01D19/04
CPCB01D19/0404B01D19/0409B01D19/0413
Inventor 曹光强李楠田伟王浩宇王云张义李隽
Owner PETROCHINA CO LTD
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