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Amido polymer filtrate loss reducer for water-based drilling fluid resistant to high temperature, salt and calcium and preparation method and application thereof

A technology of amine-based polymer and water-based drilling fluid, which is applied in the field of drilling fluid, can solve the problems of difficult addition of amine-based polymer fluid loss control agent, increased shear force of drilling fluid viscosity, and large fluctuations in rheological properties of drilling fluid. Achieve the effect of enhancing steric stability and inhibiting coalescence

Inactive Publication Date: 2017-02-22
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when used in high-density drilling fluid, due to the high solid content of the drilling fluid and the encounter with muddy shale formations, it is difficult to add the amino polymer fluid loss reducer to the drilling fluid, even if a small amount of fluid loss reducer is added. Fluid loss additives will also cause a sharp increase in the viscosity and shear force of the drilling fluid, and the rheological properties of the drilling fluid will fluctuate greatly. Finally, such fluid loss additives cannot be used

Method used

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  • Amido polymer filtrate loss reducer for water-based drilling fluid resistant to high temperature, salt and calcium and preparation method and application thereof
  • Amido polymer filtrate loss reducer for water-based drilling fluid resistant to high temperature, salt and calcium and preparation method and application thereof
  • Amido polymer filtrate loss reducer for water-based drilling fluid resistant to high temperature, salt and calcium and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0028] An amine-based polymer fluid loss reducer for high-temperature and anti-salt-calcium water-based drilling fluids, composed of acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, allyl polyethylene glycol, triethylene glycol The mole of acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, allyl polyethylene glycol, trihydroxyethyl allyl ammonium bromide The ratio is 8.1~20.2:9~15.2:2.1~4.3:8~10, and the reaction formula is:

[0029]

[0030] Wherein, m=40%~45%, n=40%~45%, p=1-m-n-q, q=8%~10%, and the molecular weight of allyl polyethylene glycol is between 400~1000, K 9 to 20, m, n, p, q represent mole percentage.

[0031] The preparation method of the amine-based polymer fluid loss reducer comprises the following steps: press acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, allyl polyethylene glycol, trihydroxyethylallyl bromide The molar ratio of ammonium chloride is 8.1~20.2:9~15.2:2.1~4.3:8~10 Weigh the monomer raw material; dissolve 2-acrylamido-2-me...

Embodiment 2

[0032] Structural characterization of the amino polymer fluid loss control agent obtained in Example 2

[0033] Depend on figure 1 It can be seen that 1044.28cm -1 for-SO 3- The characteristic absorption peak of , indicating that the molecular structure of the polymer product contains sulfonic acid groups; 2920.67cm -1 for CH 2 The bending vibration absorption peak of the group; 1660.47cm -1 It is the C=O stretching vibration absorption peak of amide group; 1544.04cm -1 It is the N-H bond bending vibration and C-N bond stretching vibration absorption peak in the secondary amide -CONH- group; 1397.41cm -1 at -CH 3 The characteristic absorption peak; 1277.38cm -1 At the C-N stretching vibration absorption peak; 982.24cm -1 where RCH=CH 2 Middle = C-H bending vibration peak; 3400.21cm -1 It is the non-associated N-H contraction vibration absorption peak; 1174.31cm -1 There is a characteristic absorption peak at , indicating that the product molecule contains etheroxy g...

Embodiment 3

[0034] Aqueous solution performance research of the amino polymer fluid loss reducer obtained in embodiment 3

[0035] Table 1: Rheology of Amine-Based Polymer Fluid Loss Control Agents

[0036] Addition amount of fluid loss control agent (wt%) 0.5 1.0 1.5 2 Apparent viscosity (mPa·s) 2.5 4.5 7.0 8.5 Plastic viscosity (mPa·s) 2.0 4.0 6.5 8.5

[0037] It can be seen from Table 1 that the viscosity of the polymer solution gradually increases with the increase in the amount of fluid loss control agent added. When the solution concentration is 2%, its apparent viscosity and plastic viscosity are only 8.5mPa·s, which shows that the viscosity enhancing effect of fluid loss control agent is limited.

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Abstract

The invention provides an amido polymer filtrate loss reducer for water-based drilling fluid resistant to high temperature, salt and calcium and a preparation method and application thereof. The filtrate loss reducer is prepared from acrylamide, 2-acrylamido-2-methyl propanesulfonate, allyl polyethylene glycol and ammonium triethoxylallylbromide, wherein the molar ratio of the four monomers is (8.1-20.2):(9-15.2):(2.1-4.3):(8-10). The filtrate loss reducer can be effectively adsorbed on clay particles, meanwhile, hydration groups, namely sulfo groups and hydroxyl groups can bring an adsorbed hydration layer to the clay particles, steric stability of a disperse system is enhanced, the situation that fine particles aggregate to form dense mud cakes is effectively suppressed, and therefore the effect of filtrate loss reduction is achieved. Vander Waals force and electrostatic attraction exist between cationic quaternary ammonium groups and the clay particles with negative charges on surfaces, and therefore the filtrate loss reducer can be firmly adsorbed on the surfaces of the clay particles; steric hindrance generated by long side chains of polyoxyethylene groups can enhance the rigidity of main chains, and therefore the temperature resistance of a polymer is improved.

Description

technical field [0001] The invention relates to the technical field of drilling fluids, in particular to an amine-based polymer fluid loss reducer for high-temperature and salt-resistant calcium water-based drilling fluids and its preparation method and application. The amine-based polymer fluid loss reducer is suitable for petroleum Oil and gas drilling process encounters drilling fluid in deep high-temperature and high-pressure formations. Background technique [0002] Due to the rapid increase in demand for oil and natural gas resources in my country and the depletion of oil and gas energy in shallow formations, the development of oil and gas energy in deep formations is the main way out for the future development of my country's petroleum industry, and deep well and ultra-deep well drilling technology is indispensable. High-temperature resistant water-based drilling fluid technology is a key technology for drilling high-temperature deep wells, and has always been a diffi...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/56C08F220/58C08F226/02C09K8/035
CPCC08F283/065C09K8/035C08F220/585
Inventor 刘鹭蒲晓林都伟超罗霄杨彦东
Owner SOUTHWEST PETROLEUM UNIV
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