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Anionic acrylamide polymer, calcium chloride weighted fracturing fluid containing anionic acrylamide polymer, and preparation methods of anionic acrylamide polymer and calcium chloride weighted fracturing fluid

A technology of acrylamide and acrylamide monomers, applied in chemical instruments and methods, separation/purification of carboxylic acid amides, compositions of drilling holes, etc., can solve problems such as reducing construction pressure and achieve good temperature resistance and shear resistance. Performance, stable performance, and complete glue breaking effect

Pending Publication Date: 2021-10-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the fracturing of such ultra-high temperature and ultra-high pressure reservoirs, the power of the pump unit of the fracturing vehicle has reached the limit, and the reduction of the construction pressure by reducing the friction of the fracturing fluid is also limited.

Method used

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  • Anionic acrylamide polymer, calcium chloride weighted fracturing fluid containing anionic acrylamide polymer, and preparation methods of anionic acrylamide polymer and calcium chloride weighted fracturing fluid
  • Anionic acrylamide polymer, calcium chloride weighted fracturing fluid containing anionic acrylamide polymer, and preparation methods of anionic acrylamide polymer and calcium chloride weighted fracturing fluid
  • Anionic acrylamide polymer, calcium chloride weighted fracturing fluid containing anionic acrylamide polymer, and preparation methods of anionic acrylamide polymer and calcium chloride weighted fracturing fluid

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Effect test

Embodiment 1

[0049] This embodiment provides a high-concentration divalent salt-resistant, high-temperature-resistant polymer and its production process. The preparation process includes the following processes:

[0050] (1) Preparation process of acrylamide monomer

[0051] According to the technological process of microbial acrylamide, firstly, special microbial bacteria are cultivated in three-stage amplification, and the fermentation liquid with sufficient number of bacteria is cultivated through the strain bottle, seed tank and fermentation tank, and then transferred to the hydration catalytic reaction kettle and then added with acrylonitrile , so that bacteria can metabolize acrylonitrile to produce acrylamide. The acrylamide aqueous solution produced later has other impurities such as residual bacteria and residual acrylonitrile, so it needs to be refined by membrane filtration and ion exchange columns. The final acrylamide aqueous solution is the main raw material for the synthesis...

Embodiment 2

[0061] This embodiment provides a high-concentration divalent salt-resistant, high-temperature-resistant polymer and its production process. The preparation process includes the following processes:

[0062] (1) Preparation process of acrylamide monomer

[0063] According to the technological process of microbial acrylamide, firstly, special microbial bacteria are cultivated in three-stage amplification, and the fermentation liquid with sufficient number of bacteria is cultivated through the strain bottle, seed tank and fermentation tank, and then transferred to the hydration catalytic reaction kettle and then added with acrylonitrile , so that bacteria can metabolize acrylonitrile to produce acrylamide. The acrylamide aqueous solution produced later has other impurities such as residual bacteria and residual acrylonitrile, so it needs to be refined by membrane filtration and ion exchange columns. The final acrylamide aqueous solution is the main raw material for the synthesis...

Embodiment 3

[0073] This embodiment provides a high-concentration divalent salt-resistant, high-temperature-resistant polymer and its production process. The preparation process includes the following processes:

[0074] (1) Preparation process of acrylamide monomer

[0075] According to the technological process of microbial acrylamide, firstly, special microbial bacteria are cultivated in three-stage amplification, and the fermentation liquid with sufficient number of bacteria is cultivated through the strain bottle, seed tank and fermentation tank, and then transferred to the hydration catalytic reaction kettle and then added with acrylonitrile , so that bacteria can metabolize acrylonitrile to produce acrylamide. The acrylamide aqueous solution produced later has other impurities such as residual bacteria and residual acrylonitrile, so it needs to be refined by membrane filtration and ion exchange columns. The final acrylamide aqueous solution is the main raw material for the synthesis...

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Abstract

The invention discloses an anionic acrylamide polymer, a calcium chloride weighted fracturing fluid containing the anionic acrylamide polymer, and preparation methods of the anionic acrylamide polymer and the calcium chloride weighted fracturing fluid. The anionic acrylamide polymer is formed by polymerizing an acrylamide monomer, a cationic monomer, an anionic monomer and a nonionic monomer through an aqueous solution method. The polymer is mainly composed of a C-C rigid main chain for improving the shearing resistance and temperature resistance of the polymer, a sulfonic group for improving the salt resistance, a hydrophobic group for enhancing the hydrophobicity, a hydrolysis-resistant group for enhancing the stability of the polymer, and a strong coordination group for enhancing the instant cross-linkable property. The polymer can resist high temperature of 180 DEG C and high-concentration divalent calcium ions, can be cross-linked with a metal cross-linking agent to form a weighted fracturing fluid system, and is applied to fracturing yield increase of three-super (ultra-high temperature, ultra-high pressure and ultra-deep) and one-low (low permeability) oil and gas reservoirs.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to an anionic acrylamide polymer, a calcium chloride-weighted fracturing fluid containing the same, and respective preparation methods. Background technique [0002] In the process of efficient reconstruction of risk exploration wells in key domestic exploration fields, high temperature and high pressure deep formations have always been the key exploration fields, and the limit depth of reservoir depth has exceeded 8000m. The depth of the target layer in the Kuqa foreland thrust belt in the Tarim Oilfield is getting deeper and deeper, and the physical properties of the reservoir are getting worse. In the Keshen 13 and Keshen 9 blocks, the buried depth of the reservoir exceeds 8000m, the formation pressure is close to 140MPa, the formation temperature is close to 190℃, the matrix is ​​denser, and the heterogeneity of natural fractures is stronger. For the fract...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F212/14C08F220/54C09K8/68C09K8/88C07C231/24C07C233/09C12P13/02
CPCC08F220/56C09K8/68C09K8/685C09K8/882C09K8/887C09K8/665C09K8/845C07C231/24C12P13/02C08F212/30C08F220/54C07C233/09
Inventor 王丽伟高莹徐敏杰韩秀玲杨战伟王辽滕起石阳刘玉婷刘萍李亚琪
Owner PETROCHINA CO LTD
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