Preparation method of tackifier for drilling fluid

A technology for tackifier and drilling fluid, which is applied in the field of preparation of tackifier for drilling fluid, can solve the problems of low leakage of drilling fluid, difficult adjustment and control, and inability to satisfy drilling engineering, etc., and achieves strong and good resistance to salt. The ability to increase viscosity and adjust the flow pattern, and the effect of good leakage reduction ability

Inactive Publication Date: 2012-02-01
陆明富
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Problems solved by technology

Under high temperature conditions, various components in the drilling fluid will undergo changes such as degradation, fermentation, thickening and failure, which will cause drastic changes in the performance of the drilling fluid, and it is difficult to adjust and control; and with high formation pressure, The drilling fluid must have a high density, resulting in a high sol

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Embodiment Construction

[0007] The invention provides a method for preparing a viscosifier for drilling fluid, which comprises the following steps: step 1, adding 71kg of acrylamide and 700kg of water into a polymerization kettle, stirring until the acrylamide dissolves, and preparing a 20% acrylamide aqueous solution, After purging nitrogen and removing oxygen for 30 minutes, add 0.1kg initiator at 35°C, and react at constant temperature for 4-8 hours to obtain gel polyacrylamide; step 2, take out gel polyacrylamide and granulate, add water, and stir Prepare a 2% polyacrylamide aqueous solution under low temperature; step 3, first adjust the pH of the system to 11 with sodium hydroxide solution, then raise the temperature to 60-75°C, then add 85kg formaldehyde and 100kg sodium bisulfite aqueous solution, and stir for 5 hours Afterwards, sulfomethylated polyacrylamide colloids are obtained; step 4, the reactant is cooled to room temperature, discharged, precipitated and separated with 95% ethanol, and...

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Abstract

The invention discloses a preparation method of a tackifier for a drilling fluid. The method comprises the following steps of: adding 71 kg of acrylamide and 700 kg of water into a polymerizing kettle, preparing a 20 percent acrylamide aqueous solution, adding 0.1 kg of initiator after a certain period of time, and reacting at constant temperature for a certain period of time to obtain gel polyacrylamide; taking the gel polyacrylamide out, pelletizing, and preparing into 2 percent polyacrylamide aqueous solution; adjusting the pH of a system to 11 with a sodium hydroxide solution, adding 85 kg of formaldehyde and 100 kg of sodium bisulfite aqueous solution, and reacting with stirring for a certain period of time to obtain sulfomethylated polyacrylamide gel; precipitating and separating reactants with 95 percent ethanol, and recycling and distilling an ethanol aqueous solution for circular use; and taking a precipitated polymer, removing ethanol, drying in vacuum and crushing to obtain a product. The tackifier has large tackifying and flow pattern adjusting capabilities, and can be used for keeping the viscosity of the drilling fluid under severe conditions such as high temperature, high salinity, high calcium-magnesium ions and the like.

Description

technical field [0001] The invention relates to a preparation method of a viscosifier for drilling fluid. Background technique [0002] In oil drilling, due to the increase of well depth, the bottom of the well is under high temperature and high pressure conditions, the drilling section is long and there are large sections of open holes, and many complex formations must be drilled, so the operating conditions are much harsher than ordinary wells, so Higher requirements are also placed on the performance of drilling fluids. Under high temperature conditions, various components in the drilling fluid will undergo changes such as degradation, fermentation, thickening and failure, which will cause drastic changes in the performance of the drilling fluid, and it is difficult to adjust and control; and with high formation pressure, The drilling fluid must have a high density, resulting in a high solid content in the drilling fluid. In this case, the possibility of downhole comple...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F8/36C09K8/035
CPCY02P20/582
Inventor 陆明富
Owner 陆明富
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