Multistage adsorption polymer fluid loss agent and preparation method thereof

A fluid loss reducing agent and polymer technology, which is applied in the field of oilfield chemicals and oil well cementing admixtures, can solve the problems of single molecular weight distribution, single adsorption strength, and lack of universality, and achieve good temperature resistance, The effect of preventing negative effects and good steric hindrance

Active Publication Date: 2022-04-08
成都欧美克石油科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Although the above-mentioned patent is prepared from the first monomer, the second monomer and the third monomer, they only polymerize each substance in one reaction system, and the formed polymer is a product with a single adsorption strength and a single molecular weight distribution. There is no general applicability to solve the problems in the current polymer cement slurry system. It only pursues the ability to control water loss at high temperature, ignoring other properties. Therefore, it cannot achieve a balance in the three aspects of bulging core, water loss and stability. , still subject to great limitations at high temperatures

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  • Multistage adsorption polymer fluid loss agent and preparation method thereof
  • Multistage adsorption polymer fluid loss agent and preparation method thereof
  • Multistage adsorption polymer fluid loss agent and preparation method thereof

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Embodiment 1

[0055] This example provides a multi-stage adsorption polymer fluid loss reducer and its preparation method. It is composed of three polymers with different adsorption strengths. In terms of weight percentage, it includes 55% of binary copolymers and 30% of terpolymers. %, 15% tetrapolymer, stirred at 50°C for 30min and mixed evenly.

[0056] The preparation method of the binary copolymer comprises the following steps: by weight percentage, the total amount is 100%, the balance is water, 15% of 2-acrylamide-2-methylpropanesulfonic acid, N,N- Diethylacrylamide 7%, dissolve in water, mix and stir evenly, then add 2.4% sodium hydroxide to adjust the pH value to 5.4~6.0, transfer it to a four-necked flask, heat up to 40°C~50°C, add 0.02% Dodecyl mercaptan, pass through inert gas protection, then prepare 0.08% initiator tert-butyl hydroperoxide / sodium metabisulfite to make an aqueous solution with a mass concentration of 15%, add dropwise, continue to stir and react for 2 to 3 hour...

Embodiment 2

[0061] This example provides a multi-stage adsorption polymer fluid loss reducer and its preparation method, which is composed of three polymers with different adsorption strengths, including 50% of binary copolymers and 38% of terpolymers by weight percentage. %, 12% tetrapolymer, stirred at 50°C for 30min and mixed evenly.

[0062] The preparation method of the binary copolymer comprises the following steps: by weight percentage, the total amount is 100%, and the balance is water. Dissolve 18% of 2-acrylamido-2-methylpropanesulfonic acid and 8% of N,N-dimethylacrylamide in water, mix and stir evenly, then add 2.6% sodium hydroxide to adjust the pH value to 5.4~ 6.0, transfer to a four-neck flask, heat up to 40°C-50°C, add 0.025% dodecyl mercaptan, pass through inert gas protection, and then prepare 0.06% initiator tert-butyl hydroperoxide / sodium metabisulfite Add dropwise an aqueous solution with a mass concentration of 15%, and continue to stir and react for 2 to 3 hours t...

Embodiment 3

[0067] This embodiment provides a multi-stage adsorption polymer water loss reducer and a preparation method thereof, which is composed of three kinds of polymers with different adsorption strengths, including 46% of the binary copolymer and 34% of the terpolymer in terms of weight percentage. %, tetrapolymer 20%, stir for 30min at 50°C and mix well.

[0068] The preparation method of the binary copolymer includes the following steps: by weight percentage, the total amount is 100%, and the balance is water. Dissolve 2-acrylamido-2-methylpropanesulfonic acid 21% and N,N-dimethylaminoethyl methacrylamide 12% in water, mix and stir evenly, and then add 3.1% sodium hydroxide to adjust The pH value is 5.4~6.0, transfer to a four-necked flask, heat up to 40℃~50℃, add 0.035% dodecyl mercaptan, pass into inert gas protection, and then peroxidize 0.12% initiator tert-butyl Hydrogen / sodium metabisulfite is prepared into an aqueous solution with a mass concentration of 15% and added dro...

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Abstract

The invention discloses a multistage adsorption polymer fluid loss agent and a preparation method thereof, and belongs to the technical field of oil field chemicals and additives for oil well cement well cementation. The multistage adsorption polymer fluid loss agent comprises the following components in percentage by weight: 35%-60% of a biopolymer, 20%-40% of a terpolymer and 10%-30% of a quadripolymer. The multi-stage adsorption polymer fluid loss agent provided by the invention can be used for ultra-high-temperature deep well cementation, the applicable temperature can reach 30-210 DEG C, and the multi-stage adsorption polymer fluid loss agent can effectively inhibit poor stability of cement paste caused by excessive dispersion at high temperature and improve the condition of abnormal gelatinization of the cement paste caused by excessive strong adsorption groups; the adaptability of the polymer fluid loss agent in an oil well cement slurry system is improved.

Description

technical field [0001] The invention belongs to the technical field of oil field chemicals and admixtures for oil well cement cementing, and in particular relates to a multi-stage adsorption polymer fluid loss reducer and a preparation method thereof. Background technique [0002] Polymer fluid loss reducer for oil well cement, as one of the three main agents for oil and gas well cementing, is a kind of agent that can control the fluid loss of liquid-phase permeable formation in the cement slurry, so as to keep the cement slurry with an appropriate water-cement ratio. Polymer materials can prevent the cement slurry from losing too much water, thereby affecting the rheology, thickening time and other properties of the cement slurry, which can lead to construction accidents in severe cases. [0003] It is an inevitable trend that oil and gas exploration and development are gradually developing towards deep wells and ultra-deep wells. At the same time, it also poses new challe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/487C08F220/58C08F220/54C08F220/06C08F283/06C04B24/16C04B103/46
Inventor 高金罗庆李云唐昌强李勇
Owner 成都欧美克石油科技股份有限公司
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