Filtrate reducer for drilling fluid and preparation method thereof

A technology of fluid loss reducer and drilling fluid, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of high temperature resistance and salt resistance of fluid loss reducer, and achieve good temperature resistance and salt resistance. Performance, good filtration effect

Inactive Publication Date: 2016-06-15
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of oil and natural gas drilling, the requirements for fluid loss control agents for drilling fluids are getting higher and higher. Due to the continuous exploitation of dee

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

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preparation example Construction

[0029] The present invention also provides a kind of preparation method of drilling fluid fluid loss reducer, comprising the following steps:

[0030] Acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, hexadecyl dimethyl allyl ammonium chloride, initiator and water are mixed and heated to obtain the fluid loss control agent for drilling fluid.

[0031] In the present invention, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, hexadecyl dimethyl allyl ammonium chloride, initiator and water are mixed. In the present invention, the method of mixing and heating is preferably carried out according to the following steps:

[0032] Mix acrylamide with water, stir to dissolve, then add 2-acrylamido-2-methylpropanesulfonic acid, stir to dissolve, then add hexadecyldimethylallyl ammonium chloride, stir to dissolve, and obtain mono Body mixed solution;

[0033] mixing and heating the monomer mixed solution with an initiator to obtain a gel product;

[0034] The gel product i...

Embodiment 1～9

[0066] According to the monomer ratio in Table 1, mix the acrylamide (AM) with water, stir to dissolve, then add 2-acrylamido-2-methylpropanesulfonic acid (AMPS), stir to dissolve, then add sixteen Alkyl dimethyl allyl ammonium chloride (DMAAC-16), stirring and dissolving, preparing a monomer mixed solution with a monomer concentration of 20 wt%, and adjusting the pH to 7 with sodium hydroxide solution;

[0067] The monomer mixed solution and the mass ratio are 1:1 (NH 4 ) 2 S 2 o 8 with NaHSO 3 The composite initiators were mixed and heated at 50° C. for 4 hours to obtain a gel product, wherein the added amount of the initiator accounted for 0.2 wt % of the total mass of the monomers.

[0068] The gel product was washed and purified three times with absolute ethanol, and the product was dried in an oven at a temperature of 50° C. for 24 hours to obtain a fluid loss reducer for drilling fluid.

[0069] Add 40g of calcium bentonite and 2g of anhydrous sodium carbonate to 1...

Embodiment 10～14

[0075] According to the molar ratio of AM, AMPS and DMAAC-16 is 2:4:0.5, mix the acrylamide (AM) with water, stir to dissolve, then add 2-acrylamido-2-methylpropanesulfonic acid (AMPS) , stirring and dissolving, then adding cetyl dimethyl allyl ammonium chloride (DMAAC-16), stirring and dissolving, preparing a monomer mixed solution with a monomer concentration of 20wt%, and adjusting the pH with sodium hydroxide solution = 7;

[0076] The monomer mixed solution and the mass ratio are 1:1 (NH 4 ) 2 S 2 o 8 with NaHSO 3 The composite initiators were mixed and heated at 50° C. for 4 hours to obtain a gel product, wherein the amount of the initiator added (relative to the total mass of the monomers) is shown in Table 2.

[0077] The gel product was washed and purified three times with absolute ethanol, and the product was dried in an oven at a temperature of 50° C. for 24 hours to obtain a fluid loss reducer for drilling fluid.

[0078] Add 40g of calcium bentonite and 2g o...

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Abstract

The invention provides a filtrate reducer for drilling fluid. The filtrate reducer is characterized by being prepared from acrylamide, 2-acrylamido-2-methyl propyl sulfonic acid and hexadecyl dimethyl allyl ammonium chloride. According to the invention, the acrylamide, 2-acrylamido-2-methyl propyl sulfonic acid and hexadecyl dimethyl allyl ammonium chloride are taken as raw materials for preparing the filtrate reducer for the drilling fluid, and the filtrate reducer for the drilling fluid has relatively good filtration reducing property and also has relatively good temperature and salt tolerance.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas, and in particular relates to a fluid loss control agent for drilling fluid and a preparation method thereof. Background technique [0002] During the drilling process, due to the pressure difference, the water in the drilling fluid will inevitably leak into the formation through the wellbore wall, causing the drilling fluid to lose water. As the water enters the formation, the clay particles in the drilling fluid adhere to the well wall to form a "filter cake", forming a filter cake well wall. Since the well wall of the filter cake is much denser than the original well wall, on the one hand, it prevents the drilling fluid from further dehydration, and on the other hand, it plays a role in protecting the well wall. However, during the formation of the filter cake wall, too much water is lost by filtration, the filter cake is too thick, and fine clay particles enter the formation...

Claims

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Application Information

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IPC IPC(8): C09K8/035C08F220/56C08F220/58C08F226/02
CPCC08F220/56C09K8/035C08F220/585C08F226/02
Inventor 全红平张宁康陈燎张太亮段文猛
Owner SOUTHWEST PETROLEUM UNIV
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