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High salt-resistant foaming agent and preparation method thereof

A foaming agent and high-resistance technology, which is applied in the direction of chemical instruments and methods, and drilling compositions, etc., can solve the problems of foaming height, liquid-carrying capacity decline, weakening the effect of drainage and gas recovery construction technology, etc., and achieves the preparation method Simple, good resistance to high salinity, low equipment requirements

Inactive Publication Date: 2018-12-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under formation conditions, the foaming, foam stabilizing performance and thermal stability of the foaming agent are affected by the bottom hole temperature, salinity and condensate oil content, and the increase of temperature, salinity and condensate oil content will lead to The bubble height and liquid-carrying capacity decrease, thus weakening the effect of drainage and gas recovery construction technology

Method used

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  • High salt-resistant foaming agent and preparation method thereof
  • High salt-resistant foaming agent and preparation method thereof
  • High salt-resistant foaming agent and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0030] In another specific embodiment of the present invention, a kind of preparation method of high-salt resistant foaming agent is provided, and this preparation method may comprise the following steps:

[0031] Step 1: Add starch and ethylenediaminetetraacetic acid to the high-salinity water respectively, heat to 80°C, stir at a speed of 150 rpm until the mixed solution becomes transparent and becomes viscous, and cool to obtain a mixed solution;

[0032] Step 2: adding cocamidopropyl betaine, foam booster, foam stabilizer, pH regulator and methanol to the mixed solution respectively, and stirring to obtain a high-salt-resistant foaming agent.

[0033] Specifically, in step 1, starch and ethylenediaminetetraacetic acid are successively added to the high-salinity water, heated to 70°C-85°C (preferably 80°C), and then heated at 100-200 rpm (preferably 150 rev / min) stirring at a rotating speed of 5min-10min until the mixed solution becomes transparent and becomes viscous, stop...

Embodiment 1

[0043] This example provides the high salinity resistance and oil resistance test evaluation tests of the high salt resistance blowing agent shown in Table 1.

[0044] Experimental Materials:

[0045] Self-prepared brine 1# (salinity 50000mg / L, Ca 2+ , Mg 2+ Total content 1000mg / L) 500mL;

[0046] Self-prepared brine 2# (salinity 100000mg / L, Ca 2+ , Mg 2+ Total content 5000mg / L) 500mL;

[0047] Self-prepared brine 3# (salinity 150000mg / L, Ca 2+ , Mg 2+ Total content 10000mg / L) 500mL;

[0048] Self-prepared brine 4# (salinity 200000mg / L, Ca 2+ , Mg 2+ Total content 15000mg / L) 500mL;

[0049] Self-prepared brine 5# (salinity 200000mg / L, Ca 2+ , Mg 2+ Total content 20000mg / L) 500mL.

[0050] A certain amount of starch, EDTA (ethylenediaminetetraacetic acid), CAB35 (cocamidopropyl betaine), foam booster (polyoxyethylene octylphenol ether-10 with a mass ratio of 3:1:1, stearin amides and tea polyphenols), foam stabilizers, pH regulators, methanol.

[0051] Condensate...

Embodiment 2

[0064] This example provides an evaluation experiment of the liquid carryover test of the high-salt-resistant blowing agent shown in Table 2.

[0065] Experimental Materials:

[0066] Self-prepared brine (salinity 200000mg / L, Ca 2+ , Mg 2+ Total content 20000mg / L) 500mL.

[0067] A certain amount of starch, EDTA (ethylenediaminetetraacetic acid), CAB35 (cocamidopropyl betaine), foam booster (polyoxyethylene octylphenol ether-10 with a mass ratio of 3:1:1, stearin amides and tea polyphenols), foam stabilizers, pH regulators, methanol.

[0068] Condensate oil 500mL.

[0069] Experimental equipment: constant temperature liquid carrying device, several 500mL beakers, 100mL measuring cylinder

[0070] experimental method:

[0071] Prepare 5 groups of foaming agents with different contents according to the order of foaming agent configuration with self-prepared salt water, each group is 100mL;

[0072] Use a graduated cylinder to take the condensate oil for later use, and mea...

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Abstract

The invention provides a high salt-resistant foaming agent and a preparation method thereof. The high salt-resistant foaming agent comprises 0.2-0.5% of starch, 0.3-1.0% of ethylenediaminetetraaceticacid, 1.0-2.5% of cocamidopropyl betaine, 0.5-1.0% of a foam booster, 0.05-0.5% of a foam stabilizer, 0.05-0.2% of a pH adjuster, 0.1-0.2% of methanol, and the balance of highly mineralized water. Theinvention also provides the preparation method of the foaming agent. The foaming agent has the advantages of high mineralization resistance and good gas condensate resistance.

Description

technical field [0001] The invention relates to a high-salt-resistant foaming agent and a preparation method thereof, belonging to the technical field of oil field chemistry. Background technique [0002] During the development process of natural gas wells, due to edge and bottom water propulsion, water injection drive and fracturing operations, water continuously accumulates in the wellbore, and the gas production rate drops or even is crushed to death. The common techniques used in oil and gas fields at home and abroad to remove fluid accumulation from natural gas wells include foam drainage technique and liquid nitrogen technique. The effect of liquid nitrogen method is better when repairing dead wells, but it requires a professional operation team and the operation cost is high. Foam drainage gas recovery is through the injection of foam agent to improve the liquid-carrying capacity of the air flow, thereby removing the blockage of gas-water flow, low cost, high product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/60C09K8/90C09K8/94C09K8/514C09K8/518
CPCC09K8/514C09K8/518C09K8/602C09K8/905C09K8/94
Inventor 王尧李瑞王斯雯龙华王浩戴倩倩彭宝亮吴享远吴晓明张成博宋阳王磊冷冰
Owner PETROCHINA CO LTD
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