Anionic surfactant for micro-foam drilling fluid and preparation method thereof

A surfactant and anionic technology, which is applied in the field of oilfield drilling fluid treatment agent synthesis, can solve the problems that it is difficult to ensure the low density of drilling fluid, poor air tightness in microbubbles, and affect the safety of drilling construction, etc., and achieve compression resistance Strong, strong foaming ability, low cycle density effect

Active Publication Date: 2015-01-28
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two types of micro-bubble drilling fluids use surfactants with ordinary linear structures, which are poorly sealed to the air in the micro-bubbles, and the air is prone to leakage under high-pressure conditions at the bottom of the well. It is difficult to ensure the low density of the drilling fluid at the bottom of the well. , affecting drilling safety

Method used

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  • Anionic surfactant for micro-foam drilling fluid and preparation method thereof
  • Anionic surfactant for micro-foam drilling fluid and preparation method thereof
  • Anionic surfactant for micro-foam drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Dissolve 5g of acrylic acid and 25g of 2-acrylamido-2-methylpropanesulfonic acid in 100g of clear water to obtain a mixed reaction monomer solution. For use, dissolve 0.4g of ammonium persulfate in 70g of clear water for use, and add 50g of 2- Acrylamide dodecane sulfonic acid and 0.8g hydroquinone were dissolved in 150g of water and the temperature was raised to 50°C, then the mixed reaction monomer solution and ammonium persulfate solution were added to the reaction system, and then the system was raised to 90°C After reacting for 1 hour, a surfactant product with a solid content of 20% is obtained. After the reaction, the system is neutralized with sodium hydroxide to a pH value of 8, and after drying and crushing, a surface active agent for microbubble drilling fluid with an average molecular weight of 7000 is obtained. The structural formula is:

[0022]

[0023] The amount ratio of x:y:z substances is 3.1:1.4:2.4.

Embodiment 2

[0025] Dissolve 10g of methacrylic acid and 50g of sodium allyl sulfonate in 120g of clear water to obtain a mixed reaction monomer solution. For use, dissolve 0.55g of ammonium persulfate in 60g of clear water for use, and add 50g of 2-acrylamidodecane Sulfonic acid and 0.11g isopropanol were dissolved in 150g water and the temperature was raised to 40°C, then the mixed reaction monomer solution and ammonium persulfate solution were added to the reaction system, and then the system was heated to 100°C for 2h to obtain the solid phase content 25% surfactant product. After the reaction, the system is neutralized with sodium hydroxide to pH 8. After drying and pulverization, a surfactant for microbubble drilling fluid with an average molecular weight of 10,000 is obtained. Its structural formula is:

[0026]

[0027] The amount ratio of x:y:z substances is 3.4:2.3:6.9.

Embodiment 3

[0029] Dissolve 50g of itaconic acid and 30g of 2-acryloxybutyl sulfonic acid in 60g of clear water to obtain a mixed reaction monomer solution. For use, dissolve 1.3g of ammonium persulfate in 10g of clear water for use, and add 50g of 2-acrylamide Tetradecanesulfonic acid and 2.6g copper sulfate were dissolved in 60g water and the temperature was raised to 60°C, then the mixed reaction monomer solution and ammonium persulfate solution were added to the reaction system together, and then the system was heated to 95°C for 1.5h. A surfactant product with a solid content of 50% is obtained. After the reaction, the system is neutralized with sodium hydroxide to a pH value of 8.5. After drying and crushing, a surfactant for microbubble drilling fluid with an average molecular weight of 1000 is obtained. The structural formula is:

[0030]

[0031] The amount ratio of x:y:z substances is 2.9:7.7:2.9.

[0032] The steps in Examples 4 to 7 are the same as in Example 1. The reaction mater...

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Abstract

The invention relates to an anionic surfactant for a micro-foam drilling fluid and a preparation method thereof. The anionic surfactant is obtained by mixing a long-chain vinyl monomer A, a carboxyl-containing monomer B and a sulfo-group-containing monomer C according to the mass ratio of 10:1-10:1-10, adding a relative-molecular-mass adjusting agent and performing free radical polymerization. The average relative molecular mass of the anionic surfactant is 1000-10000. The preparation method is simple and practicable, the obtained surfactant is good in foaming performance and high in foam stability, is capable of guaranteeing that the micro-foam drilling fluid has relatively low circulation density at a well-bottom high pressure, and is beneficial for reducing downhole complications.

Description

Technical field [0001] The invention relates to a surfactant for anionic microbubble drilling fluids and a preparation method thereof, in particular to a surfactant for microbubble drilling fluids used in the drilling process of low-pressure and easy-leakage formations, and belongs to the technical field of treatment agent synthesis for oilfield drilling fluids . technical background [0002] Micro-bubble drilling fluid is a new type of low-density drilling fluid developed in recent years. It is called Aphron drilling fluid abroad. It produces uniform foam through physical stirring. These foams have a "energy gathering" effect and exhibit a certain degree of rigidity. It realizes the low density and good rheology of the drilling fluid under high pressure conditions at the bottom of the hole, does not affect the use of pump water and MWD and other downhole tools, and can effectively prevent low-pressure crushing, high-permeability sandstone and fractured leakage formations, and pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08F220/58C08F220/06C08F228/02C08F222/02C08F220/38
CPCC08F220/382C08F220/58C08F220/585C08F222/02C08F228/02C09K8/38C08F220/06C08F220/38
Inventor 谢建宇周亚贤宋雅静卢国林刘光成吕跃滨
Owner CHINA PETROCHEMICAL CORP
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