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Gas well foaming agent and its preparation method and application

A technology of foaming agent and gas well, which is applied in the fields of anti-acid gas well foaming agent, temperature resistance and salt resistance, which can solve the problems of poor foam stability, long half-life, large liquid carrying capacity, etc. Strong bubble effect

Active Publication Date: 2021-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] One of the technical problems to be solved by the present invention is the high-temperature, high-salt, acidic, and condensate gas wells in the prior art, especially the problem of poor foam stability in the drainage and gas recovery process under acidic conditions. Temperature-resistant, salt-resistant, and acid-resistant foaming agents for gas wells, especially acid-resistant foaming agents. 2+ , Mg 2+ The simulated water with a total content of 500-50000mg / L, pH=3-7, and a condensate content of 0%-15% (wt) is clear and transparent, with good foaming properties and long half-life at a temperature of 75°C (that is, stability Good), the advantages of large liquid carrying capacity

Method used

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  • Gas well foaming agent and its preparation method and application
  • Gas well foaming agent and its preparation method and application
  • Gas well foaming agent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In terms of mass percentage, 0.06wt% sodium dodecyl diphenyl ether sulfonate (R 1 , R 2 =C 12 ;A=O;M 1 , M 2 =Na + ), 0.14wt% cocamidopropyl betaine (R 3 =R'CONH-;R'=C 8 ~C 18 , R 4 , R 5 =CH 3 , R 6 =-CH 2 -, B is COO - , c=3) and a certain amount of anionic polyacrylamide X (wt%) were dissolved in Southwest Oilfield Formation Simulated Water 1 and stirred for 30 minutes to obtain the required foaming agent. The ion content of formation simulation water 1 in Southwest Oilfield is shown in Table 1. Under the condition of a water bath at 75°C, the foaming time, liquid carrying capacity, foam half-life and liquid carrying half-life of the foam discharge agent were measured with a foam scanning analyzer (FOAMSCAN). The results are shown in Table 2.

[0042] Table 1

[0043] name Na +

Mg 2+

Ca 2+

Cl -

total salinity pH value Content (mg / L) 8109 50 926 13915 23000 4.5

[0044] Table 2

[0045]

Embodiment 2

[0047] Take the foam discharge agent in [Example 1] and put it into a pressure bomb, put it into an oven, age at 150°C for 15 days, take it out, and measure the foam discharge agent’s performance with a foam scanning analyzer (FOAMSCAN) under the condition of a 75°C water bath. The results of foaming time, liquid carrying capacity, foam half-life and liquid carrying half-life are shown in Table 3.

[0048] table 3

[0049]

Embodiment 3

[0051] In terms of mass percentage, get 0.02wt% sodium dodecyl diphenyl ether sulfonate (R 1 , R 2 =C 12 ;A is O;M 1 , M 2 for Na + ), 0.18wt% cocamidopropyl betaine and a certain amount of anionic polyacrylamide were dissolved in the Southwest oilfield formation simulated water 2 and stirred for 30 minutes to obtain the required foaming agent. The ion content of formation simulation water 2 in Southwest Oilfield is shown in Table 4. Under the condition of a water bath at 75°C, the foaming time, liquid carrying capacity, foam half-life and liquid carrying half-life of the foam discharge agent were measured with a foam scanning analyzer (FOAMSCAN). The results are shown in Table 5.

[0052] Table 4

[0053] name Na +

Mg 2+

Ca 2+

Cl -

total salinity pH value Content (mg / L) 58310 500 3500 97690 160000 3.6

[0054] table 5

[0055]

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Abstract

The invention relates to a temperature-resistant, salt-resistant, acid-resistant foaming agent suitable for condensate gas wells and its preparation method and application, which mainly solves the problems of high temperature, high salt, acidity and condensate gas wells in the prior art, especially It is a technical problem of poor foam stability in the process of drainage and gas recovery under acidic conditions. By using a foam discharge agent, the following components are included in parts by mass: (1) 0.01 to 1 part of anionic surfactant; (2) )0.01~1 part of zwitterionic surfactant; (3) The technical scheme of 0.01~0.5 part of foam stabilizer solves this problem well. It has good foaming performance in water, long half-life, and large liquid carrying capacity, which can solve the drainage and gas production problems of high temperature, high salt, acid, and condensate gas wells. The raw materials are low in toxicity, low in irritation, low in price and easy to obtain, and can be used in the industrial production of gas well drainage and gas recovery.

Description

technical field [0001] The invention relates to a temperature-resistant, salt-resistant and acid-resistant gas well foaming agent suitable for condensate gas wells, a preparation method and application thereof. Background technique [0002] During the development of natural gas wells, due to the advancement of edge water, water injection drive, fracturing and other operational measures, water will continue to accumulate in the wellbore, resulting in a decrease in gas production and even crushing the gas well. [0003] At present, the common methods for removing liquid accumulation from natural gas wells in oil and gas fields at home and abroad include foam drainage method and liquid nitrogen method. When repairing dead wells, the effect of using liquid nitrogen method is better, but the liquid nitrogen method requires a professional operation team and the cost is very high. The foam drainage method is a drainage and gas recovery technology developed rapidly in recent years,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584
CPCC09K8/584
Inventor 吴春芳沈之芹李应成何秀娟
Owner CHINA PETROLEUM & CHEM CORP
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