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Lost circulation material with soft outside and rigid inside and preparation method thereof

A plugging material and rigid material technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of inorganic calcium carbonate falling off, affecting on-site construction, affecting the fluidity of cement slurry, etc.

Pending Publication Date: 2021-10-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the product prepared by the above method needs to be ground to obtain the required particle size, and the grinding process may cause the problem of inorganic calcium carbonate falling off; and the shape of the ground material is irregular particles, adding to the cement slurry will affect the cement slurry. Fluidity, thus affecting site construction

Method used

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  • Lost circulation material with soft outside and rigid inside and preparation method thereof
  • Lost circulation material with soft outside and rigid inside and preparation method thereof
  • Lost circulation material with soft outside and rigid inside and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Modification method of rigid material quartz sand:

[0039] (1) First pre-hydrolyze KH570, mix 4g KH570, 75g absolute ethanol, and 25g distilled water into beaker A, adjust pH=4~5 with dilute hydrochloric acid, transfer to a three-necked flask, stir vigorously at room temperature for 30min, and complete pre-hydrolysis .

[0040] (2) Add 100 g of absolute ethanol and 20 g of quartz sand into beaker B, place it in an ultrasonic cleaner to vibrate for 20 min, and transfer it to a three-neck flask.

[0041] (3) Introduce nitrogen and raise the temperature to 70°C, react at a stirring speed of 350r / min for 5 to 6 hours, stop the reaction, wash with absolute ethanol for 3 to 4 times after cooling, filter and dry to obtain modified quartz sand.

Embodiment 2

[0043] The preparation method of the gel microsphere not including the modified rigid material, the specific steps include:

[0044] (1) Add 80 g of cyclohexane and 4 g of Span-80 into a three-necked flask equipped with a reflux condenser, stirring blades and a nitrogen pipe, and stir at 30° C. for 20 minutes at high speed to obtain a continuous phase.

[0045] (2) Weigh 40g of distilled water in a beaker, add 14g of acrylamide, 3g of 2-acrylamido-2-methylpropanesulfonic acid, 3g of N-vinylpyrrolidone, and then add 0.1g of N,N-methylene Bisacrylamide, stirred evenly, configured as a dispersed phase.

[0046] (3) Take 20g of the prepared dispersed phase, drop it into the continuous phase at a constant speed for 30min, adjust the stirring speed to 300r / min, after stirring for 30min, adjust the temperature of the water bath to the reaction temperature of 70°C, and then dissolve an appropriate amount of 0.2g potassium persulfate-sodium bisulfite (1:1) mixed aqueous solution was a...

Embodiment 3

[0049] A method for preparing a plugging material that is soft on the outside and rigid on the inside, the specific steps are:

[0050] (1) Add 80g of cyclohexane, 4g of Span-80, and 0.8g of modified sand into a three-necked flask equipped with a reflux condenser, stirring blades and a nitrogen pipe, and stir at a high speed for 20min at 30°C to make Quartz sand is evenly dispersed to obtain a continuous phase.

[0051] (2) Weigh 40g of distilled water in a beaker, add 14g of acrylamide, 3g of 2-acrylamido-2-methylpropanesulfonic acid, 3g of N-vinylpyrrolidone, and then add 0.1g of N,N-methylene Bisacrylamide, stirred evenly, configured as a dispersed phase.

[0052] (3) Take 20g of the prepared dispersed phase, drop it into the continuous phase at a constant speed for 30min, adjust the stirring speed to 300r / min, after stirring for 30min, adjust the temperature of the water bath to the reaction temperature of 70°C, and then dissolve an appropriate amount of 0.2g potassium p...

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Abstract

The invention belongs to the field of oil and gas well cementation and oilfield chemistry, and particularly relates to a lost circulation material with soft outside and rigid inside and a preparation method thereof. The lost circulation material is a complex microsphere material which is prepared by taking acrylamide, 2-acrylamido-2-methylpropanesulfonic acid and N-vinyl pyrrolidone as comonomers as a flexible material and taking modified silicon dioxide and / or modified quartz sand as a modified rigid material through a reversed-phase suspension method, and the mass ratio of the acrylamide to the 2-acrylamido-2-methylpropanesulfonic acid to the N-vinyl pyrrolidone is (14-16):(3-2):(3-2). The lost circulation material with soft outside and rigid inside not only has variability, but also has a certain skeleton supporting effect. Along with the increase of the polymer concentration, the water absorption multiple of the material is increased, the deformability is enhanced, gaps with different sizes can be adaptively selected, and effective plugging is formed.

Description

technical field [0001] The invention belongs to the fields of oil and gas well engineering cementing and oilfield chemistry, and in particular relates to a plugging material which is soft on the outside and rigid on the inside and a preparation method thereof. Background technique [0002] With the continuous increase of deepwater drilling in the ocean, more and more complex situations are encountered. Due to the special depositional environment in deep water, the pressure of the overlying strata is low, and there are low-strength and high-brittle leakage formations in deep water, such as reef limestone formations. The basic characteristics of this type of formation are loose, porous, low-strength and high brittleness. Coral Sand (calcareous sand). The bearing capacity of calcareous sand is much smaller than that of quartz sand. The internal pores of calcareous sand particles determine that it is fundamentally different from quartz sand, and the particles are easily broken ...

Claims

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Application Information

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IPC IPC(8): C09K8/467C09K8/42C08F292/00C08F220/56C08F220/58C08F226/10C08F222/38C08F2/32
CPCC09K8/426C09K8/467C08F292/00C08F2/32C08F220/56C08F220/585C08F226/10C08F222/385
Inventor 任孟步玉环柳华杰郭胜来郭辛阳韩来聚
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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