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High temperature resistant amphoteric ion polymer fluid loss agent used for drilling fluid and preparation method thereof

A fluid loss reducing agent and zwitterion technology, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of inability to meet site needs, limited use range, single product performance, etc., and achieves a simple and feasible preparation method. Easy to operate, high yield effect

Inactive Publication Date: 2010-04-07
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] my country has made great progress in the research and application of drilling fluid fluid loss additives. With the continuous development of drilling fluid technology, the development and application of high temperature resistant drilling fluid fluid loss additives has become The top priority, at present, some progress has been made in the following aspects of anti-high temperature drilling fluid fluid loss additives: 1. Synthesize anti-high temperature fluid loss additives by using several high temperature resistant monomers, the selected monomers are different, and the synthesis methods are different. It is mainly anionic or cationic, which leads to single product performance and cannot meet the needs of the site; 2. Surfactants are used as temperature stabilizers to improve the temperature stabilizer of the main polymer fluid loss control agent, and the effect achieved by using this method is limited; 3. Using natural High temperature resistant raw materials are modified to obtain modified high temperature resistant fluid loss additives, such as humic acid and starch fluid loss additives, but their use has many limitations. For example, when starch fluid loss additives are used, There are high requirements on drilling fluid salinity, PH value, temperature and other conditions, so its application range is limited

Method used

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  • High temperature resistant amphoteric ion polymer fluid loss agent used for drilling fluid and preparation method thereof
  • High temperature resistant amphoteric ion polymer fluid loss agent used for drilling fluid and preparation method thereof
  • High temperature resistant amphoteric ion polymer fluid loss agent used for drilling fluid and preparation method thereof

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Embodiment 1

[0035] The synthesis of embodiment 1PAADS

[0036] Synthesis of PAADS-1

[0037]According to AM: AMPS: DMDAAC: SSS=10: 3.5: 1: 1, the ratio of total monomer concentration is 20% weighs the drug, AMPS and water are dissolved in the three-necked flask according to the feeding ratio, under cooling conditions, use Adjust the pH value to neutral with sodium hydroxide solution, then add AM dissolved in a small amount of water, and raise the temperature to 60°C, add DMDAAC, SSS and stir, pass N 2 After 30 minutes, the initiator ammonium persulfate-sodium bisulfite (0.3%) was added, the reaction was continued for 5 hours, and the reaction was stopped. The viscoelastic copolymer colloid was obtained, which was precipitated with absolute ethanol to obtain a white precipitate. Then it was repeatedly washed with absolute ethanol, and soaked in absolute ethanol for 12 hours to fully remove unreacted monomers. Finally, the precipitate was taken out and placed on a watch glass, dried and ...

Embodiment 2

[0040] The structural characterization of embodiment 2PAADS (following PAADS all refers to PAADS-1 product)

[0041] see figure 1 , figure 2 .

[0042] figure 1 It is the infrared spectrogram of PAADS, and the characteristic absorption peak analysis of the spectrogram is as follows:

[0043] 3390.5cm-1 is the stretching vibration absorption peak of non-associated-NH;

[0044] 2931.1cm-1 for -CH 3 Stretching vibration absorption peak;

[0045] 2776.1cm-1 for -CH 2 Stretching vibration absorption peak;

[0046] 1681.0cm-1 is the stretching vibration absorption peak of -C=O;

[0047] 1541.3cm-1 is the stretching vibration absorption peak of the benzene ring skeleton;

[0048] 1451.7cm-1 is the bending vibration absorption peak of -CH2-;

[0049] 1187.4cm-1, 1039.7cm1302.7cm-1 are the -CN bond stretching vibration absorption peaks of quaternary ammonium salts;

[0050] -1 for -SO 3 - the stretching vibration absorption peak;

[0051] 630.09cm-1 is the vibrational abs...

Embodiment 3

[0061] The performance research of embodiment 3PAADS aqueous solution

[0062] (1) Effect of temperature on apparent viscosity of PAADS aqueous solution

[0063] Prepare the polymer solution with a concentration of 2%, and measure its apparent viscosity after aging for 16 hours at the temperature point in Table 1. The experimental data are shown in Table 4 below:

[0064] The influence of table 4 aging temperature on copolymer PAADS aqueous solution apparent viscosity

[0065] Aging temperature (°C)

[0066] It can be seen from Table 4 that the viscosity of the polymer solution decreased after aging at different temperatures for 16 hours, and the viscosity was still about 12 mPa·s after aging at 180°C, mainly due to the carbon chain structure and molecular chain structure of the polymer. The large side group on the polymer enhances the rigidity of the molecular chain, prevents the breakage of the macromolecular chain, and improves the thermal stability of the polyme...

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Abstract

The invention relates to high temperature resistant amphoteric ion polymer fluid loss agent used for drilling fluid of a high temperature and high pressure drilling and a preparation method thereof. Four monomers, namely, acrylamide (AM), 2-acrylamide-2-methyl propane sulfonic acid (AMPS), dimethyl diallylammonium chloride (DMDAAC) and styrenesulfonate (SSS) are used as raw materials, wherein the mole ratio of AM:AMPS:DMDAAC:SSS is (9-11):(3-4):(0.5-1.5):(1.0-1.5); ammoniumpersulfate-sodium bisulfite as an initiator is added and solution is copolymerized through a polymerization method to compose the fluid loss agent. The fluid loss agent provided by the invention has the advantages of ideal high temperature resistant (more than 220 DEG C) reducing filtrate performance, shale inhibition performance and stable fluid rheology performance and simple preparation method, convenient operation and higher yield.

Description

technical field [0001] The invention relates to a drilling fluid fluid loss reducer used for high-temperature and high-pressure formation drilling in the oil drilling process and a preparation method thereof, in particular to a zwitterionic polymer fluid loss reducer and a preparation method thereof. Background technique [0002] my country has made great progress in the research and application of drilling fluid fluid loss additives. With the continuous development of drilling fluid technology, the development and application of high temperature resistant drilling fluid fluid loss additives has become The top priority, at present, some progress has been made in the following aspects of anti-high temperature drilling fluid fluid loss additives: 1. Synthesize anti-high temperature fluid loss additives by using several high temperature resistant monomers, the selected monomers are different, and the synthesis methods are different. It is mainly anionic or cationic, which leads t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08F220/56
Inventor 蒲晓林郑琨贺明敏苏俊霖王贵
Owner SOUTHWEST PETROLEUM UNIV
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