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High-strength multifunctional plugging agent

A multi-functional plugging agent technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as easy to be diluted and washed away, easy failure of plugging layers, poor adaptability and safety, etc. Controllable glue time, improved development effect, and high compressive strength

Inactive Publication Date: 2019-08-09
陕西鼎和源瑞环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex and diverse proportions of cement inorganic salt plugging agents and the shrinkage phenomenon during the solidification process, the plugging layer is prone to failure under back pressure, and the effective plugging period is too short; gel, hydrogel, and micro-swelling plugging agents There is no adhesive force between the agent and the interface, and it is easily diluted and washed away when it meets water; the adaptability and safety of thermosetting resin plugging agents are too poor, and the risk of on-site construction is high. Once there is a problem with the construction equipment and the delay is caused, the construction often cannot be carried out. , even secondary accidents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Synthesis of Unsaturated Polyester

[0064] Add 44.4g of dimethyl isophthalate-5-sodium sulfonate, 223.2g of ethylene glycol, 312g of neopentyl glycol, 0.29g of hydroquinone and 1.2g of dibutyltin oxide to 2000ml of four In a flask with nitrogen protection, heat up to 120°C and start stirring, heat up to 140-145°C and keep warm for 2 hours; gradually heat up to 170°C, keep warm at 170-175°C for 3 hours; cool down to 160°C, add phthalic anhydride 421.80g, maleic anhydride 294.00g, then gradually increase the temperature to 190°C; control the column temperature not to exceed 103°C during the temperature rise process, keep the temperature at 190-195°C, when the output reaches 110g or more, vacuumize for 2.5 hours, and measure the acid value 10mgKOH / g; when stirring and cooling down to 180°C, add 0.29g of hydroquinone and 0.54g of wax, continue to stir and cool down to about 120°C, and pour into the mixture of 723.5g of styrene and 0.29g of polymerization inhibitor prepared...

Embodiment 2

[0067] Vinyl Synthesis

[0068] Weigh 1176g of bisphenol A diglycidyl ether epoxy resin with an average molecular weight of 392g / mol and put it into a 2000ml three-necked flask, and heat it to 90°C under stirring; 477.3g of methacrylic acid, 0.33g of hydroquinone, Dimethylimidazole 0.05g is evenly mixed and then added dropwise to a three-necked flask within 100 minutes, and the temperature is raised to 100-105°C while stirring for four hours. The acid value is measured to be less than 5mgKOH / g, and the temperature is lowered to below 80°C. Finally, pour into the mixture of 708g of styrene and 0.33g of polymerization inhibitor prepared in advance, stir and mix evenly, cool to below 50°C, filter and pack.

Embodiment 3

[0070] Select 100 g of unsaturated polyester synthesized in Example 1, 3 g of vinyl triethoxysilane, 2 g of fumed silica, 10 g of light calcium carbonate below 25 nanometers, and 10 g of polypropylene micropowder below 5 microns under the ultrasonic cell disruptor After uniform dispersion; add 2 g of 10% dimethylaniline styrene solution and 2 g of 50% benzoyl peroxide paste, gel at 30°C, and the gel time is 40-60 minutes.

[0071] In order to prevent the provided micron or nanometer-level functional nanomaterials from settling during storage, the nanofiller uses fumed silica (purchased from Dalian Liansheng Trading Co., Ltd.).

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PUM

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Abstract

The invention discloses a high-strength multifunctional plugging agent. The plugging agent comprises, by mass, 100 parts of a structural forming agent, 0.001-15 parts of a curing agent, 0.001-10 partsof an interface adhesion agent, 0.001-200 parts of a nano filler and 0.001-30 parts of a diluent, wherein the structural forming agent comprises one or two of unsaturated polyester and vinyl resin; the curing agent comprises one or more of peroxide, persulfide and azo compounds; the interface adhesion agent comprises vinyl triethoxy silane or vinyl trimethoxy silane; the nano filler comprises oneor more of nanoscale or micron-scale carbonate, silicate and sulfate. During use, the structural forming agent, the curing agent, the interface adhesion agent, the nano filler and the diluent are mixed and react to generate liquid gel; the liquid gel is injected to a target plugged zone position and is solidified to form the high-strength multifunctional plugging agent. The plugging agent is stable in performance, good in residence property, high in adhesion force, high in elasticity modulus and high in compressive strength, and has a wide application range and good effects in oil and gas field drilling and production operation.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, and relates to a high-strength and multifunctional plugging agent. Background technique [0002] Lost circulation is an inevitable problem in the exploitation of oil and gas fields, which seriously hinders the smooth progress of oil and gas field development. Due to the special and complex geological conditions and strong injection and strong production, damage and leakage of oil and water wells are very common, and the problem of well condition deterioration is becoming more and more serious, especially in some old wells, due to the long service life of the casing and the cementing cement is not completely sealed. The solid casing is very easy to be perforated due to corrosion or mechanical friction in the free section of the casing. In addition, deformation and damage of the casing will cause mud and water to flow out of the formation, seriously affecting the normal production of oil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508C09K8/512
CPCC09K8/5083C09K8/5086C09K8/512C09K2208/10
Inventor 徐贵东李忠洋李建中李磊冯松林李德权铁成军陈博侯宝东刘洋韩利宝朱永刚
Owner 陕西鼎和源瑞环境工程有限公司
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