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Borehole reinforcement shielding agent and preparation method thereof

A shielding agent, wellbore technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the risk of leakage risk, the difficulty of predicting and judging the risk of wellbore instability, the hidden safety hazards of underground operations, and the large economic losses of risks, etc. problem, to achieve the effect of low cost, enhanced compressive strength and blocking ability, and good quality

Inactive Publication Date: 2018-09-14
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the way of configuring the plugging slurry has solved many leakage problems, the risks and potential economic losses during the period are huge and very passive
[0004] For deep-water gas fields, due to the complexity and heterogeneity of the formation, it is difficult to predict and judge the risk of leakage and wellbore instability, which brings great hidden dangers to the safety of downhole operations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A wellbore reinforced shielding agent, consisting of the following components by weight:

[0028] 40 parts of polyalkyl silicone resin, 10 parts of methyl acrylate, 6 parts of glycidyl epoxy resin, 0.5 part of nano calcium carbonate, 10 parts of hydroxy silicone oil, 0.1 part of dibutyl tin trilaurate stannous octoate, Tween 80 0.5 parts, 80 parts deionized water.

[0029] A method for preparing a wellbore strengthening shielding agent includes the following steps:

[0030] (1) Put polyalkyl silicone resin, methyl acrylate, glycidyl ester type epoxy resin, hydroxy silicone oil and deionized water into the reaction kettle in order according to the direction, stir evenly, add appropriate amount of caustic soda to adjust the pH value in the range of 7-9;

[0031] (2) Add Tween 80, inject nitrogen gas during the period, and stir for 2 hours;

[0032] (3) Add nano calcium carbonate, start the stirring state, stir for 3h, and heat up to 80°C under the stirring state;

[0033] (4) Add d...

Embodiment 2

[0036] A wellbore reinforced shielding agent, consisting of the following components by weight:

[0037] 68 parts of polyaryl silicone resin, 22 parts of ethyl acrylate, 22 parts of bisphenol A epoxy resin, 1.0 part of nano silica, 18 parts of vinyl silicone oil, 0.5 part of dibutyl tin diacetate, Tween 80 1 Parts, 100 parts deionized water.

[0038] A method for preparing a wellbore strengthening shielding agent includes the following steps:

[0039] (1) Put polyaryl silicone resin, ethyl acrylate, bisphenol A type epoxy resin, vinyl silicone oil and deionized water into the reaction kettle according to the direction, stir evenly, add appropriate amount of caustic soda to adjust the pH value in the range of 7-9 ;

[0040] (2) Add Tween 80, during which nitrogen is introduced, and stirred for 2h;

[0041] (3) Add nano-silica, start the stirring state, stir for 3h, and heat up to 90℃ under the stirring state;

[0042] (4) Add dibutyl tin diacetate and react for 5 hours at 120°C;

[0043]...

Embodiment 3

[0045] A wellbore reinforced shielding agent, consisting of the following components by weight:

[0046] Epoxy modified silicone resin 20 parts, polyester modified silicone resin 34 parts, 2-methyl methacrylate 16 parts, bisphenol F type epoxy resin 14 parts, nano-magnesium oxide 0.8 parts, amino silicone oil 14 parts , 0.3 parts of tin diethyl dioctanoate, 0.75 parts of Tween 80, and 90 parts of deionized water.

[0047] Another object of the present invention is to provide a method for preparing a wellbore reinforced shielding agent, which includes the following steps:

[0048] (1) Put epoxy-modified silicone resin, polyester-modified silicone resin, 2-methyl methacrylate, bisphenol F epoxy resin, amino silicone oil and deionized water into the reaction kettle in sequence according to the direction, and stir. Evenly, add proper amount of caustic soda to adjust the pH value in the range of 7-9;

[0049] (2) Add emulsifier, during which nitrogen is introduced and stirred for 2h;

[00...

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PUM

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Abstract

The invention relates to a borehole reinforcement shielding agent and a preparation method thereof, and belongs to the technical field of chemical engineering. The shielding agent comprises, by weight, 40-68 parts of organic silicon resin, 10-22 parts of acrylate polymers, 6-22 parts of epoxy resin, 0.5-1.0 part of nano-blocking agents, 10-18 parts of reactive silicon oil, 0.1-0.5 part of catalysts, 0.5-1 part of emulsifying agents and 80-100 parts of deionized water. The preparation method includes the steps: sequentially adding organic silicon resin, the acrylate polymers, the epoxy resin, the reactive silicon oil and the deionized water into a reaction kettle, uniformly stirring mixture, and adjusting a pH (potential of hydrogen) value to reach 7-9; adding the emulsifying agents, stirring mixture for 2 hours, adding the nano-blocking agents, stirring mixture for 3 hours, and heating the mixture to reach the temperature of 80-90 DEG C; adding the catalysts, performing reaction for 5hours at the temperature of 100-120 DEG C, cooling mixture to reach the temperature of 50-60 DEG C, keeping the temperature for 2 hours, and performing cooling and discharging. The method is simple inprocess and low in cost, the prepared borehole reinforcement shielding agent is stable in performance and good in quality, the compressive strength and the sealing capability of sand rock and mud rock cores can be enhanced, and stability is improved.

Description

Technical field [0001] The invention relates to a wellbore strengthening shielding agent and a preparation method thereof, and belongs to the technical field of chemical engineering. Background technique [0002] In the process of deep-water oil and gas exploration and development drilling, shallow formations are under-compacted and easy to leak, deep high-temperature formations mudstone formations are easy to instability, high-temperature and high-pressure gas layers are easy to leak and easy to blowout are important factors restricting the safety of deep-water, high-temperature and high-pressure gas fields , And adding drilling fluid plugging materials and configuring plugging slurry on site are the main technical measures to prevent and solve well wall instability and leakage. [0003] Drilling plugging technology mainly reduces the intrusion of filtrate into the formation by controlling fluid loss and adding bituminous plugging materials, thereby preventing the instability of t...

Claims

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Application Information

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IPC IPC(8): C09K8/035
CPCC09K8/035
Inventor 李中黄熠王尔钧李炎军刘和兴顾纯巍陈浩东何连吴志明孟文波徐一龙赵学战余意向兴金
Owner CHINA NAT OFFSHORE OIL CORP