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Artificially synthesized polymer fracturing fluid with molecular weight of 500,000 to 10,000,000

A synthetic polymer and artificial synthesis technology, which is applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problem of poor temperature resistance, large flow conductivity of filling layers and formation damage, and poor shear resistance and salt resistance. and other problems, to achieve good temperature resistance and eliminate the effect of macromolecular chain residues

Inactive Publication Date: 2011-06-15
北京国海能源技术研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural vegetable gum fracturing fluid can only form "short and thick" high fractures due to its high inherent viscosity and the use of alkaline boron-based crosslinking agents, which limits the extension of fracture length to deep parts; alkaline crosslinking The system is also a great damage to alkali-sensitive formations with high clay content. At the same time, there are also defects such as high water-insoluble content and large residues that will greatly damage the conductivity of the filling layer and the formation; synthetic polymer fracturing fluids due to excessive molecular weight Long links have the defect of poor shear resistance and salt resistance; surfactant fracturing fluid has the defect of poor temperature resistance due to its own special gel-forming characteristics

Method used

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  • Artificially synthesized polymer fracturing fluid with molecular weight of 500,000 to 10,000,000

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1, the volume that needs to be made into the present invention is 150m 3 :

[0012] Synthetic polymer: 675 kg, crosslinker: 375 kg, clay stabilizer 825 kg, surfactant: 450 kg, oxidant: 7.5 kg and water: 148270 kg.

[0013] In the above formula, the synthetic polymer is: a copolymer of acrylamide-based monomer and vinyl monomer with a molecular weight of 5 million; the crosslinking agent is: organic chromium and formaldehyde mixture (organic chromium is chromate, ethylene glycol, Compound of acetic acid and lactic acid); clay stabilizer: KCl; surfactant: 0-20 and fluorocarbon; oxidant: ammonium persulfate.

Embodiment 2

[0014] Embodiment 2, the volume that needs to be made into the present invention is 100m 3 :

[0015] Water 97570kg, synthetic polymer 1000kg, crosslinking agent 800kg, clay stabilizer 1000kg, surfactant 400kg, oxidant 30kg.

[0016] In the above formula, the synthetic polymer is: a homopolymer of acrylamide-based monomer with a molecular weight of 500,000; the crosslinking agent is: a mixture of organic chromium and organic aluminum; the clay stabilizer is: NH4Cl; the surfactant is: OP- 10; The oxidant is: Periodic acid. The organoaluminum mixture in the crosslinking agent is a compound of chromium salt, aluminum salt, glycerol, citric acid and glyoxal.

Embodiment 3

[0017] Embodiment 3, the volume that needs to be made into the present invention is 280m 3 :

[0018] 274,120 kg of water, 84 kg of synthetic polymer, 560 kg of cross-linking agent, 2,800 kg of clay stabilizer, 2,240 kg of surfactant, and 4.2 kg of oxidant.

[0019] The synthetic polymer in the above formula is: a copolymer of acrylamide-based monomer, vinyl monomer and hydrophobic monomer with a molecular weight of 10 million; the cross-linking agent is: a mixture of formaldehyde, glyoxal and phenolic; the clay stabilizer is : KBr and tetramethylammonium chloride; surfactant: NP-100 and fluorocarbon; oxidant: ammonium persulfate.

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Abstract

The invention belongs to an artificially synthesized polymer fracturing fluid for fracturing production and injection increase of oil fields, and particularly relates to an artificially synthesized polymer fracturing fluid with the molecular weight of between 500,000 and 10,000,000 which has good temperature resistance, salt resistance and shearing resistance and avoids macromolecular chain group residue. The artificially synthesized polymer fracturing fluid is prepared from the following raw materials in part by weight: 0.1 to 1 part of synthetic polymer, 0.1 to 1 part of crosslinking agent, 0.2 to 1 part of clay stabilizer, 0.1 to 0.8 part of surfactant, 0.001 to 0.05 part of oxidant, and 94 to 99 parts of water. The artificially synthesized polymer fracturing fluid has the advantages of having good temperature resistance, salt resistance and shearing resistance and avoiding the macromolecular chain group residue.

Description

technical field [0001] The invention belongs to an artificially synthesized polymer fracturing fluid used for oil field fracturing, stimulation and injection, and specifically relates to a kind of high temperature resistance, salt resistance and shear resistance, which can prevent the artificial synthesis of 500,000-10,000,000 molecular weight of macromolecular chain residues Polymer fracturing fluids. Background technique [0002] In oil and gas exploration and development, the hydraulic sand fracturing technology for reservoirs is to use the ground high-pressure pump to inject the liquid into the well at a displacement that greatly exceeds the absorption capacity of the formation, and build up high pressure at the bottom of the well, which exceeds the well. After the formation stress near the wall and the tensile strength of the rock, fractures are formed in the formation. The fracturing fluid with proppant continues to be injected into the fracture, the fracture is exten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
Inventor 张玄姚佩峰张瑞涛
Owner 北京国海能源技术研究院
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