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Micron-sized degradable gel particle for acidification and temporary plugging, and preparation method thereof

A gel particle, micron-scale technology, used in chemical instruments and methods, drilling compositions, etc., can solve the problems of secondary damage, low polymer degradation, limited mechanical steering applications, etc., and achieve temporary plugging. Strong ability, easy to use, controllable particle size

Inactive Publication Date: 2019-12-06
PETRO KING ENERGY TECH HUIZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a micron-scale degradable gel particle for acidification temporary plugging and its preparation method, which solves the limitation of mechanical diversion and chemical diversion used in carbonate rock acidification in the prior art. The degree of polymer degradation is not high, and it is easy to cause secondary damage, etc.

Method used

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Examples

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preparation example Construction

[0027] The present invention also provides the above-mentioned preparation method of micron-scale degradable gel particles for acidification temporary plugging, comprising the following steps:

[0028] A. Mix and dissolve acrylamide monomer, sodium 2-acrylamide-2-methylpropanesulfonate and NaOH in water to obtain a water phase; mix the emulsifier and paraffin oil evenly to obtain an oil phase, and the mixed oil phase The hydrophilic-lipophilic balance (HLB) is 4.5-6.0;

[0029] B. In an inert gas environment, mix the oil phase and the water phase at room temperature, add a chelating agent and a dispersant, stir to make the oil phase and the water phase mix and emulsify to form an emulsion; the inert gas can be nitrogen, helium or argon gas; the stirring speed is 200 rpm to 700 rpm, and the emulsification time is 30 min to 50 min;

[0030] C. In an inert gas environment, place the emulsion in a water bath, add an oxidizing agent and a reducing agent, and stir the reaction; the...

Embodiment 1

[0038] 15kg of acrylamide monomer, 7kg of 2-acrylamide-2-methylpropanesulfonate sodium and 1.5kg of NaOH were mixed and dissolved in 76.5kg of water to obtain an aqueous phase; 3kg of polyoxyethylene sorbitan The stearic acid ester, 9 kg of sorbitan sesquioleate and 88 kg of paraffin oil are uniformly mixed to obtain an oil phase, and the hydrophilic-lipophilic balance (HLB) of the mixed oil phase is 4.5-6.0. After the oil phase and the water phase are prepared respectively, mix 30L of the water phase with 70L of the oil phase at room temperature, add pentasodium diethylenetriaminopentaacetic acid with a mass ratio of 0.2%, and add polyethylene glycol with a mass ratio of 0.3%. Alcohol (200) diacrylate and N,N'-methylenebisacrylamide with a mass ratio of 0.2% were emulsified for 50 minutes at a stirring speed of 200 rpm, and nitrogen gas was kept flowing during the emulsification. After the emulsification is completed, put it in a water bath at 40°C (keep nitrogen flowing all ...

Embodiment 2

[0041] 25kg of acrylamide monomer, 13kg of 2-acrylamide-2-methylpropanesulfonate sodium and 2.5kg of NaOH were mixed and dissolved in 59.5kg of water to obtain an aqueous phase; 7kg of polyoxyethylene sorbitan The stearic acid ester, 21 kg of sorbitan sesquioleate and 72 kg of paraffin oil are uniformly mixed to obtain an oil phase, and the hydrophilic-lipophilic balance (HLB) of the mixed oil phase is 4.5-6.0. After the oil phase and the water phase are prepared respectively, mix 40L of the water phase with 60L of the oil phase at room temperature, add pentasodium diethylenetriaminopentaacetic acid with a mass ratio of 0.5%, and add polyethylene glycol with a mass ratio of 0.8%. Alcohol (200) diacrylate and N,N'-methylenebisacrylamide with a mass ratio of 0.9% were emulsified for 30 minutes at a stirring speed of 700 rpm, and helium was kept flowing during the emulsification. After the emulsification is completed, put it in a water bath at 70°C (keep helium flowing all the ti...

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Abstract

The invention relates to a micron-sized degradable gel particle for acidification and temporary plugging, and a preparation method thereof. The micron-sized degradable gel particle comprises the following components: a water phase, an oil phase, a chelating agent, a dispersing agent, an oxidizing agent and a reducing agent. The water phase comprises the following raw materials: an acrylamide monomer, sodium 2-acrylamido-2-methyl propanesulfonate, NaOH and water. The oil phase comprises the following raw materials: an emulsifier and paraffin oil. The dispersing agent comprises polyethylene glycol diacrylate and N,N'-methylene bisacrylamide. The micron-sized degradable gel particle for acidification and temporary plugging is easy to prepare and convenient to use; the micron-sized degradablegel particle can be easily injected into stratum pores, pore throats, microcracks and the like, and then absorbs water to swell so as to plug a high-permeability layer, and thus, the temporary plugging and steering effect in the process of fracturing acidizing is achieved; and meanwhile, the micron-sized degradable gel particle can be applied to well stimulation measures such as deep profile control and flooding and effluent control, and can be completely degraded.

Description

technical field [0001] The invention relates to the technical field of oil well production, in particular to a micron-scale degradable gel particle for acidification temporary plugging and a preparation method thereof. Background technique [0002] Carbonate rock acidification, especially secondary acidification, due to the heterogeneity of formation permeability, the development of pores or natural fractures, the placement position of acidizing working fluid in the formation and the diversion of acid liquid in the formation have always been carbonates. The difficulty of rock acidification is that it is difficult to achieve uniform acid distribution in the formation, especially after the old oil well has been in production for a period of time, the formation pollution situation is more complicated, which increases the difficulty of uniform acid distribution in the secondary acidification of the old well. Due to the limitation of downhole production and completion strings, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/516C09K8/508C08F220/56C08F220/58
CPCC08F220/56C09K8/5083C09K8/516
Inventor 伍嘉林景禹
Owner PETRO KING ENERGY TECH HUIZHOU CO LTD
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