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

A surfactant and cationic technology, which is applied in the field of oilfield drilling fluid treatment agent synthesis, can solve the problems of increased drilling fluid bottom hole density, insufficient microbubble anti-compression ability, and affecting drilling safety, etc., to achieve foaming effect Good, reducing downhole complexity and strong compression resistance

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 kinds of microfoam drilling fluids are all anionic surfactant compound or anionic / nonionic surfactant compound, but anionic surfactant is sensitive to pH value and weak in resistance to salt and calcium, while The foaming performance of non-ionic surfactants is slightly poor, and the surfactants used are linear structures, with small relative molecular weights, poor sealing to the air core in the microbubbles, and insufficient compression resistance of the microbubbles. The air diffuses out from the foam, resulting in a significant increase in the density of the bottom hole of the drilling fluid, which affects the safety of drilling operations

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dissolve 10g of acrylamide in 60g of clear water for later use, dissolve 0.6g of ammonium persulfate in 60g of clear water for later use, dissolve 50g of nonyldimethylallyl ammonium chloride and 0.2g of hydroquinone in 120g of clear water and raise the temperature to 55°C, then add the acrylamide solution and the ammonium persulfate solution into the reaction system together, raise the temperature of the system to 90°C and react for 1 hour to obtain a surfactant for microfoam drilling fluid with an average molecular weight of 4000 and a solid phase content of 20%. The structural formula is:

[0021]

[0022] The amount ratio of x:y substance is 2.0:1.4.

Embodiment 2

[0024] Dissolve 5g of N,N-dimethylacrylamide in 60g of clear water for later use, dissolve 1.1g of ammonium persulfate in 60g of clear water for later use, dissolve 50g of dodecyldimethylallyl ammonium chloride and 0.18g of iso Dissolve propanol in 375g of water and raise the temperature to 40°C, then add the N,N-dimethylacrylamide solution and ammonium persulfate solution into the reaction system, raise the temperature to 95°C for 2 hours, and obtain an average molecular weight of 1500 solids. A surfactant for microfoam drilling fluid with a phase content of 10%, its structural formula is:

[0025]

[0026] The amount ratio of x:y substance is 3.5:1.0.

Embodiment 3

[0028] Dissolve 20g of N,N-diethylacrylamide in 40g of clear water for later use; dissolve 0.14g of ammonium persulfate in 10g of clear water for later use; Dissolve iron oxide in 80g of water and raise the temperature to 60°C, then add N,N-dimethylacrylamide solution and ammonium persulfate solution into the reaction system, raise the temperature of the system to 100°C for 1.5h, and obtain an average molecular weight of 1000 Surfactant for microfoam drilling fluid with 35% solid phase content, its structural formula is:

[0029]

[0030] The amount ratio of x:y substance is 2.9:3.1.

[0031] Embodiment 4~7 steps are identical with embodiment 1, and reaction substance and consumption thereof are as shown in table 1:

[0032] Table 1 Reaction substances and dosage table

[0033]

[0034] The cationic surfactants synthesized in Examples 1-9 were evaluated for performance.

[0035] (1) Foaming ability and foam stability

[0036] Add 1.0g of surfactant to 100mL of water,...

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Abstract

The invention relates to a cationic surfactant for a micro-foam drilling fluid and a preparation method thereof. The cationic surfactant is obtained by a vinyl cationic monomer A and a vinyl amide compound B according to the mass ratio of 10:1-10, adding a relative-molecular-mass adjusting agent and performing free radical polymerization. The average relative molecular mass of the cationic surfactant is 1000-4000. The preparation method is simple and practicable, the obtained surfactant is good in foaming performance and high in foam stability when being applied to the micro-foam drilling fluid, 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 cationic surfactant for micro-bubble drilling fluid and a preparation method thereof, in particular to a surfactant for micro-bubble drilling fluid used in the drilling process of low-pressure leaky formations, and belongs to the technical field of synthesis of treatment agents for oil field drilling fluid . technical background [0002] At present, in the process of low-pressure or underbalanced drilling in domestic oil fields, foam drilling fluid is often used to reduce the density of drilling fluid and ensure the safety of drilling construction. However, ordinary foam has a large particle size, which seriously affects the water feeding efficiency of the mud pump, and requires supporting gas injection equipment, such as compressors, production and gas injection equipment, etc., and the drilling cost is relatively high. In response to these problems, M-I Drilling Fluid Company of the United States and Acti-Systems Company j...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C08F226/02C08F220/56C08F220/54
CPCC08F226/02C09K8/035C09K8/38C08F220/56C08F220/54
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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