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Filtrate reducer for drilling fluid and preparation method thereof

A technology of fluid loss reducer and drilling fluid, applied in the field of drilling fluid, can solve problems such as reducing drilling rate and environmental pollution, and achieve the effects of reducing water loss, good water solubility, and improving filtration wall-building properties

Active Publication Date: 2019-12-24
重庆威能钻井助剂有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned prior art, the present invention provides a fluid loss control agent for drilling fluid and its preparation method to solve the problem that the existing fluid loss control agent will reduce the drilling speed and cause environmental pollution

Method used

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  • Filtrate reducer for drilling fluid and preparation method thereof
  • Filtrate reducer for drilling fluid and preparation method thereof
  • Filtrate reducer for drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment one: synthetic sulfomethyl phenolic resin

[0039] Linear resinization reaction, the reaction equation is shown in formula (IV) ~ formula (VI):

[0040]

[0041] The specific operation steps are as follows:

[0042] (1) First add 100 parts by mass of industrial phenol to the linear kettle, and then add 25 to 28 parts by mass of industrial formaldehyde under stirring conditions;

[0043](2) Stir for 3-5 minutes, after observing that there is no abnormality (including whether there are situations such as running or leaking), add hydrochloric acid with a concentration of 20% (volume concentration), and the liquid-to-solid ratio of the added hydrochloric acid solution to phenol is 0.8 × 10 -3 ~1.0×10 -3 : 1mL / g;

[0044] (3) After stirring and observing that there is no abnormality, heat up to ensure that the steam pressure is 2 to 3 kg;

[0045] (4) When stirring and heating up to the temperature in the kettle of 70°C, start the cooling water pump to carr...

Embodiment 2

[0052] Embodiment two: Synthesis of sulfomethyl compound

[0053] The sulfomethyl compound is generated by the reaction of formaldehyde with sodium bisulfite or potassium bisulfite, and the chemical reaction formula is shown in formula (VII), wherein M is Na or K:

[0054]

[0055] The specific operation steps are as follows:

[0056] Put 100 parts by mass of water and 155-160 parts by mass of sodium / potassium metabisulfite into the configuration kettle, stir and dissolve for about 30 minutes, stop stirring after the dissolution is uniform, add 29-30 parts by mass of formaldehyde in a static state, and let it stand at room temperature Soak for 30 minutes; then add 42 to 44 parts by mass of formaldehyde to the solution, and let it stand at room temperature for 1 hour; then raise the temperature to about 75°C and carry out a little stirring, and continue to stir evenly after there is no abnormality, and stop stirring when the measured pH value is 6 to 7. Complete the prepara...

Embodiment 3

[0057] Embodiment three: synthetic sulfomethyl phenolic resin

[0058] The synthetic reaction formula of sulfomethyl phenolic resin is shown in formula (VIII):

[0059]

[0060] The specific operation steps are as follows:

[0061] 1. The first sulfomethylation reaction

[0062] (1) Novolac resin is transferred to the sulfonation kettle;

[0063] (2) When the amount of material transferred is 1 / 3 to 2 / 3, start the agitator, and add the lye with a concentration of 20% (mass concentration) according to the metered amount to carry out alkali-dissolving treatment, and the lye is sodium hydroxide solution, etc. , the mass ratio of added lye and novolak resin is 0.6~0.7:1;

[0064] (3) After adding lye, add sulfomethyl compound for the first time, the first time the addition of sulfomethyl compound accounts for 34~35% of sulfomethyl compound total amount, open steam heating up simultaneously;

[0065] (4) When the material in the kettle is observed to change from muddy to cle...

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Abstract

The invention discloses a filtrate reducer for drilling fluid and a preparation method thereof. The filtrate reducer comprises sulfonated resin, polymer microcrystals, polyaluminum chloride, carboxymethyl cellulose and calcium carbonate. The sulfonated resin is preferably sulfomethyl phenolic resin, and the polymer microcrystals are preferably modified microcrystalline cellulose. The preparation method comprises the following steps: uniformly mixing polyaluminum chloride, sodium carboxymethyl cellulose and calcium carbonate to obtain mixed powder A, heating the polymer microcrystals to 55-60 DEG C, adding the heated polymer microcrystals and the mixed powder A into sulfonated resin, and uniformly stirring all the materials to obtain the filtrate reducer. The filtrate reducer provided by the invention can effectively solve the problems that the drilling speed is reduced and the environmental pollution is caused by the existing filtrate reducer.

Description

technical field [0001] The invention belongs to the technical field of drilling fluids, and in particular relates to a fluid loss reducer for drilling fluids and a preparation method thereof. Background technique [0002] Drilling fluid is the circulating flushing medium used in the hole during the drilling process. Drilling fluid is recognized to have at least the following ten functions: (1) Clean the bottom of the well and carry cuttings. Keep the bottom of the well clean, avoid repeated cutting of the drill bit, reduce wear and improve efficiency; (2) Cool and lubricate the drill bit and drill string. Reduce the temperature of the drill bit, reduce the wear of the drilling tool, and increase the service life of the drilling tool; (3) balance the side pressure of the rock on the well wall, form a filter cake on the well wall, seal and stabilize the well wall. Prevent contamination of oil and gas formations and well wall collapse. (4) Balance (control) formation pressur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C08G8/28
CPCC08G8/28C09K8/03C09K2208/12
Inventor 袁翊钱帆万伟何涛陈智王君张谦梁益漆梅
Owner 重庆威能钻井助剂有限公司
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