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Polymer sand consolidating agent and preparation method thereof

A technology of sand consolidating agent and polymer, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problem of low sand consolidating strength and achieve the effect of enhancing the consolidating 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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  • Polymer sand consolidating agent and preparation method thereof
  • Polymer sand consolidating agent and preparation method thereof
  • Polymer sand consolidating agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 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 obtained colloidal product was shredded, dried and pulverized to obtain a terpolymer of AM, DMDAAC and KH570 / A174. The molecular structure is:

[0029]

[0030] In the formula, m=14000-100000, n=6000-40000, l=6000-50000, and the molecular weight is 5-20 million.

[0031] The terpolymer of AM, DMDAAC and KH570 with a mass content of 2%, 1% ethylene glycol mon...

Embodiment 2

[0037] 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 obtained colloidal product was shredded, dried and pulverized to obtain a terpolymer of AMPS, DMDAAC and A151. The molecular structure is:

[0038]

[0039] In the formula, m=5000-30000, n=6000-40000, l=8000-60000, and the molecular weight is 5-20 million.

[0040] Add 3% AMPS, DMDAAC and A151 terpolymer, 2% ethylene glycol dibutyl ether, ...

Embodiment 3

[0046] 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:

[0047]

[0048] In the formula, m=14000-100000, n=6000-40000, l=10000-80000, and the molecular weight is 5-20 million.

[0049] Add the terpolymer of AM, DMDAAC and A171, 0.5% ethylene glycol dibutyl ether, and 1% hydrochloric acid with a mass content of 1...

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Abstract

The invention provides a polymer sand consolidating agent and a preparation method thereof. The polymer sand consolidating agent is prepared by compounding of 1%-5% of terpolymer, 0.5-2% of alcohol ether additive, 1%-5% of HCl serving as an initiator and 88%-97.5% of water or an acidizing system at the room temperature, wherein the terpolymer is composed of acrylamide or 2-acrylamido-2-methyl propanesulfonate, cationic monomer dimethyl diallyl ammonium chloride and double-bond organic silane coupling agent. The terpolymer can be independently prepared into a sand consolidating agent solution to be injected into stratums, the sand controlling rate is higher than 90%, the critical sand outflow rate is higher than 100mL / min, and the formation damage rate is smaller than 15%. The sand consolidating agent is high in compatibility with systems of hydrochloric acid, ammonium chloride, multi-hydrogen acid, fluoroboric 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 control and yield increase.

Description

technical field [0001] The invention relates to a polymer sand-consolidating agent for chemical sand control of unconsolidated sandstone reservoirs and a preparation method thereof, belonging to the technical field of petroleum engineering. 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 san...

Claims

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Application Information

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IPC IPC(8): C09K8/575
CPCC09K8/5753C09K2208/12
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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