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A supermolecule self-assembled fracturing fluid

A supramolecular self-assembly, fracturing fluid technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problem that the viscosity and sand-carrying properties of fracturing construction cannot be well satisfied, and it does not have shear recovery. , poor temperature resistance of fracturing fluid, etc., to achieve the effect of improving viscosity and sand-carrying performance, good shear resistance and good temperature resistance

Active Publication Date: 2017-12-15
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the most commonly used synthetic polymers in domestic oilfields are linear polymers. The fracturing fluid after adding synthetic polymers has poor temperature resistance and does not have good shear recovery, and cannot well meet the requirements of fracturing construction. Desired viscosity and sand-carrying properties

Method used

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  • A supermolecule self-assembled fracturing fluid
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  • A supermolecule self-assembled fracturing fluid

Examples

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Embodiment 1

[0023] Embodiment 1 provides a supramolecular self-assembly fracturing fluid, each component is composed according to the following mass percentages: supramolecular polymer HMPAM, 0.45%; viscoelastic surfactant SS, 0.1%; ammonium persulfate, 0.1%; The balance is water.

[0024] In this embodiment, the general structural formula of the supramolecular polymer HMPAM is:

[0025]

[0026] In the formula, x is 84.5%, y is 15%, m is 0.3%, n=0.2%;

[0027] a is 6, b is 2;

[0028] The viscosity-average molecular weight of the supramolecular polymer is 5 million.

[0029] In this embodiment, the viscoelastic surfactant SS is composed of the following components by weight percentage: 92.3wt% KCl, 4.6wt% sodium oleate, 3.1wt% polyzwitterionic surfactant DTPAN.

[0030] Specifically, the general structural formula of the above-mentioned polymeric zwitterionic surfactant DTPAN is:

[0031]

[0032] Specifically, the specific functions of each component in the supramolecular self...

Embodiment 2

[0043] Embodiment 2 provides a supramolecular self-assembly fracturing fluid, each component is composed according to the following mass percentages: supramolecular polymer HMPAM, 0.5%; viscoelastic surfactant SS, 0.1%; ammonium persulfate, 0.1%; The balance is water.

[0044] In this embodiment, the general structural formula of the supramolecular polymer HMPAM is:

[0045]

[0046] In the formula, x is 84.5%, y is 15%, m is 0.3%, n=0.2%;

[0047] a is 6, b is 2;

[0048] The viscosity-average molecular weight of the supramolecular polymer is 5 million.

[0049] Specifically, in this embodiment, the supramolecular polymer HMPAM is used as a thickener for increasing the viscosity of the aqueous solution.

[0050] In this embodiment, the viscoelastic surfactant SS is composed of the following components by weight percentage: 92.3wt% KCl, 4.6wt% sodium oleate, 3.1wt% polyzwitterionic surfactant DTPAN.

[0051] Specifically, the general structural formula of the above-ment...

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Abstract

The invention belongs to the technical field of unconventional oil and gas field exploitation, and particularly relates to a supermolecule self-assembled fracturing fluid. The fracturing fluid includes 0.2-0.5% by mass of a supermolecule polymer HMPAM, 0.04-0.12% by mass of a viscoelastic surfactant SS, and 0.05-0.20% by mass of ammonium persulfate, with the balance being water. The fracturing fluid is advantageous in that (1) shearing resistance is good because a three-dimensional space network structure is formed through hydrophobic association and host-guest inclusion functions among supermolecule polymer molecules and a self-assembling function of supermolecule polymer hydrophobic side chains and wormlike micelles in the viscoelastic surfactant so as to significantly improve shearing resistance of the fracturing fluid; (2) temperature resistance is good because rigid macromolecules (cyclodextrin and a benzene ring) are introduced to reduce the possibility of molecule chain breakage at high temperatures; and (3) harm to reservoirs is low because the supermolecule polymer is prepared through water-soluble monomers, the fracturing fluid after fracturing construction achieves thorough gel breaking, no water-insoluble residue is left, and harm to reservoirs is reduced to the minimum level.

Description

technical field [0001] The invention relates to a supramolecular self-assembly fracturing fluid, which belongs to the technical field of unconventional oil and gas field exploitation. Background technique [0002] As a non-renewable resource, petroleum plays an irreplaceable strategic role in the fields of industry, agriculture, national defense and aerospace. With the development of the oil and gas industry, domestic oil and gas resources with large reserves, high abundance, and easy exploration and development account for a smaller and smaller proportion of the total oil and gas resources. In the case that my country's dependence on foreign oil and gas exceeds 50%, on the one hand, we are required to increase oil and gas production on the basis of the development of existing oil and gas fields (conventional oil and gas reservoirs); Exploration and development of three low (low pressure, low permeability, low abundance) reservoirs (unconventional reservoirs). The developme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/88
CPCC09K8/604C09K8/665C09K8/68C09K8/882C09K2208/26C09K2208/30
Inventor 杜代军蒲万芬刘锐金发扬陈亚飞赵琦宁
Owner SOUTHWEST PETROLEUM UNIV
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