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Plugging agent and preparation method of same

A plugging agent and high-temperature stabilizer technology, applied in the field of plugging agent and its preparation, can solve problems such as poor plugging effect, and achieve good heat resistance, good thermal stability, and good strength

Inactive Publication Date: 2016-01-13
CNPC BOHAI DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, all of them have poor plugging effects on fractured malignant leakage.

Method used

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  • Plugging agent and preparation method of same
  • Plugging agent and preparation method of same
  • Plugging agent and preparation method of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The substances selected in this embodiment are calculated by mass percentage: 18% of acrylamide, 12% of acrylic acid, 2% of sodium sulfite-potassium persulfate system (in which sodium sulfite and potassium persulfate are each 1%), N,N-methylenebis Acrylamide 0.2%, inorganic toughening agent superfine calcium carbonate 2%, antioxidant 10103.7%, antioxidant 1680.35%, sodium bentonite 2%, balance water. Wherein, the superfine calcium carbonate is calcium carbonate powder with an average particle diameter of 0.02-0.1 μm.

[0031] The preparation method of the leakage stoppage agent provided by the present embodiment comprises the following steps:

[0032] 1) Take each component according to the proportioning ratio, and set aside;

[0033] 2) Neutralize the acrylic acid solution with a sodium hydroxide solution with a concentration of 35wt.% until the neutralization degree is 80%, add water and stir until the solution is transparent to obtain a mixed solution A;

[0034] 3...

Embodiment 2

[0041] The substances selected in this embodiment are calculated according to mass percentage: 15% of acrylamide, 15% of acrylic acid, 1.8% of sodium sulfite-potassium persulfate system (wherein sodium sulfite and potassium persulfate are 0.9% each), N,N-methylenebis Acrylamide 0.14%, inorganic toughening agent superfine calcium carbonate 1.8%, antioxidant 10102.6%, antioxidant 1680.5%, sodium bentonite 2%, balance water. Wherein, the superfine calcium carbonate is calcium carbonate powder with an average particle diameter of 0.02-0.1 μm.

[0042] The preparation method of the leakage stoppage agent provided by the present embodiment comprises the following steps:

[0043] 1) Take each component according to the proportioning ratio, and set aside;

[0044] 2) Neutralize the acrylic acid solution with a sodium hydroxide solution with a concentration of 40wt.%, until the neutralization degree is 80%, add water, stir until the solution is transparent to obtain a mixed solution A...

Embodiment 3

[0052] The substances selected in this example are calculated according to mass percentage: 10% of acrylamide, 20% of acrylic acid, 1.5% of sodium sulfite-potassium persulfate system (in which sodium sulfite and potassium persulfate are each 0.75%), N,N-methylenebis Acrylamide 0.15%, inorganic toughening agent superfine calcium carbonate 2%, antioxidant 1010 2.1%, antioxidant DLTDP 0.45%, sodium bentonite 2%, balance water. Wherein, the superfine calcium carbonate is calcium carbonate powder with an average particle diameter of 0.02-0.1 μm.

[0053] The preparation method of the leakage stoppage agent provided by the present embodiment comprises the following steps:

[0054] 1) Take each component according to the proportioning ratio, and set aside;

[0055] 2) Neutralize the acrylic acid solution with a sodium hydroxide solution with a concentration of 45wt.%, until the neutralization degree is 75%, add water, stir until the solution is transparent to obtain a mixed solution...

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Abstract

The invention discloses a plugging agent and a preparation method of the same, wherein the plugging agent is prepared from following substances, by mass, 25-55% of a monomer, 1.5-3% of a water-soluble redox system initiator, 0.2-0.4% of a crosslinking agent, 1-2.5% of an inorganic toughening agent, 2-4% of an anti-oxidizing agent A, 0.25-0.45% of an anti-oxidizing agent B, 1.5-8% of an inorganic filling material and the balanced being water, wherein the monomer is a mixture of acrylamide and acrylic acid. The preparation method includes the steps of neutralizing the acrylic acid with an alkali, mixing the acrylic acid with an acrylamide water solution, adding the inorganic toughening agent, a phenol main high-temperature stabilizer A and a phenol main high-temperature stabilizer B, stirring the mixture, adding the pre-hydrated inorganic filling material and mixing the mixture uniformly, adding the crosslinking agent and the initiator, performing a reaction until the mixture forms a viscoelastic colloidal substance; and drying and crushing the colloidal substance to obtain the plugging agent. The plugging agent is expansible, is excellent in temperature and salt resistance, is simple in preparation method and is easy to operate.

Description

technical field [0001] The invention relates to the technical field of oil and gas drilling, in particular to a plugging agent and a preparation method thereof. Background technique [0002] During the drilling process, lost circulation is a common downhole complex situation. Lost circulation can occur in shallow, middle and deep formations, and can also occur in formations of different geological ages, and in formations of various lithologies may appear. Some lost circulations only show a slow drop in the liquid level of the mud pool, while others are vicious lost circulations with entry but no exit. Once lost circulation occurs during drilling, it will not only delay the drilling operation, prolong the entire drilling cycle, and lose a large amount of drilling fluid, but also may damage oil and gas layers, interfere with geological logging, and may also cause well collapse, pipe sticking, A series of complex situations and accidents such as blowouts may even eventually l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/44
CPCC09K8/44C09K8/426
Inventor 宋元洪杨蓉和建勇吕梦妮高飞王黎晴陈光杜梦昱朱泽鑫
Owner CNPC BOHAI DRILLING ENG
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