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Sand prevention multi-branched polymer for oil-water well and preparation method of sand prevention multi-branched polymer

A multi-branched, oil-water well technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of low sand-fixing strength and achieve the effect of improving strength

Inactive Publication Date: 2016-06-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method mainly relies on the monomolecular film formed on the rock surface, so the sand-fixing strength is not high at lower concentrations, and it can only be used in weak sand-producing formations

Method used

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  • Sand prevention multi-branched polymer for oil-water well and preparation method of sand prevention multi-branched polymer
  • Sand prevention multi-branched polymer for oil-water well and preparation method of sand prevention multi-branched polymer
  • Sand prevention multi-branched polymer for oil-water well and preparation method of sand prevention multi-branched polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1, acrylamide monomer was dissolved in water at 40°C to prepare acrylamide mother liquor with a concentration of 20%, and then dimethyl diallyl ammonium chloride, 3-(methacryloyloxy)propane Trimethoxysilane (KH570 / A174) and acrylamide mother liquor were mixed according to the mass ratio of 1:3:5, and the pH of the mixed solution was adjusted to 7.0. Nitrogen was passed through the mixed solution at a speed of 60mL / min to remove oxygen for 30min, and then ammonium persulfate / sodium bisulfite of 1% of the total monomer mass was added as an initiator, and placed in a water bath at 50°C for 1h to react, The colloidal product obtained, shredded, dried, pulverized to obtain the terpolymer of AM, DMDAAC and KH570 / A174, the molecular structure is:

[0023]

[0024] In the formula, m=14000-100000, n=6000-40000, l=6000-50000, and the molecular weight is 5-20 million.

Embodiment 2

[0025] Example 2, 2-acrylamido-2-methylpropanesulfonic acid monomer was dissolved in water at 30°C to prepare a mother liquor with a concentration of 20%, and then dimethyl diallyl ammonium chloride, ethylene Triethoxysilane (A151) and 2-acrylamido-2-methylpropanesulfonic acid mother liquor were mixed according to the mass ratio of 1:1:5, and the pH of the mixed solution was adjusted to 6.5. Pass nitrogen gas to the mixed solution at a speed of 30mL / min to remove oxygen for 40min, then add potassium persulfate / sodium bisulfite with a total monomer mass of 0.5% as an initiator, and place it in a water bath at 60°C for 0.5h to react , the colloidal product that obtains, after cutting, drying, pulverizing obtains the terpolymer of AMPS, DMDAAC and A151, molecular structure is:

[0026]

[0027] In the formula, m=5000-30000, n=6000-40000, l=8000-60000, and the molecular weight is 5-20 million.

Embodiment 3

[0028] Example 3, acrylamide monomer was dissolved in water at 20°C to prepare a mother liquor with a concentration of 20%, and then dimethyl diallyl ammonium chloride, vinyltrimethoxysilane (A171) and acrylamide The mother liquor is mixed according to the mass ratio of 1:2:5, and the pH of the mixed solution is adjusted to 7.5. Pass nitrogen gas through the mixed solution at a rate of 10mL / min to remove oxygen for 15min, then add tert-butyl hydroperoxide / sodium metabisulfite with a total monomer mass of 0.1% as an initiator, and place it in a water bath at 30°C for 2h to react , the obtained colloidal product was shredded, dried and pulverized to obtain a terpolymer of AM, DMDAAC and A171. The molecular structure is:

[0029]

[0030] In the formula, m=14000-100000, n=6000-40000, l=10000-80000, and the molecular weight is 5-20 million.

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Abstract

The invention discloses a sand prevention multi-branched polymer for an oil-water well and a preparation method of the sand prevention multi-branched polymer. The multi-branched polymer is prepared by taking an oxidation-reduction system as an initiator to enable free radical copolymerization of monomer acrylamide or 2-acrylamido-2-methyl propanesulfonate, double-bond organic silane coupling agent and cationic monomer dimethyl diallyl ammonium chloride according to a free radical polymerization principle. The polymer is high in compatibility with systems of hydrochloric acid, ammonium chloride, multi-hydrogen acid, fluoroboric acid, mud acid and the like, thereby allowing addition into sandstone acidizing fluid to reduce after-acidization sand outflow risks so as to realize integration of sand prevention and yield increase. Moreover, due to adoption of a low-temperature aqueous solution free radical polymerization method, high simplicity and convenience in operation are realized.

Description

technical field [0001] The invention relates to a novel multi-branched polymer used for sand control in oil-water wells and a preparation method thereof, belonging to the technical field of oil field chemistry. Background technique [0002] Unconsolidated sandstone reservoirs have a wide range of distribution and large geological reserves, but sand particles are easily peeled off and migrated from the matrix during the mining process, resulting in serious sand production problems. At present, most sandstone oil fields in China have entered a period of high water cut. In order to ensure the stable production of oil fields, the liquid extraction intensity has been further increased, which has exacerbated the damage of the formation sand skeleton structure. The risk and scale of sand production are increasing, and the difficulty of sand control is also increasing. . The chemical sand control technology can effectively consolidate the formation sand and gravel by directly injec...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F226/02C08F230/08C08F220/58C08F2/10C09K8/575C09K8/52
CPCC09K8/52C09K8/5753C08F2/10C08F220/56C08F220/58C08F230/08C08F220/585C08F226/02
Inventor 张贵才李侠清葛际江蒋平裴海华
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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