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Modified bentonite drilling fluid for well drilling and preparation method thereof

A bentonite and drilling fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of complex modification process, high risk, poor fusion, etc. Low, the effect of improving the adjustment effect

Pending Publication Date: 2020-11-27
WUHU FEISHANG NONMETAL MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When the above-mentioned drilling fluids are used after preparation, on the one hand, too many reagents are added for modification, and some are even toxic or dangerous; some modification processes are too complicated
Moreover, due to the poor fusion of bentonite itself and other reagents in actual use, it is inevitable that in actual use, there will still be sedimentation and water segregation after a long standing time.

Method used

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  • Modified bentonite drilling fluid for well drilling and preparation method thereof
  • Modified bentonite drilling fluid for well drilling and preparation method thereof
  • Modified bentonite drilling fluid for well drilling and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] combine figure 1 , On the one hand, the present application provides a modified bentonite drilling fluid for drilling, including the following components: bentonite, viscosifier, fluid loss reducer, flow regulator, plugging agent, weighting agent, photomodified powder, pH conditioner, lubricant and water;

[0037] The tackifier is one or more of xanthan gum, amine oxide, and polyvinylpyrrolidone; the fluid loss reducer is one or more of sulfomethyl phenolic resin and lignite resin; the flow regulator is Polyamide LH-OWA or polyamide LH-ORM; the weighting agent is barite; the photomodified powder is nano ZnO or nano TiO2; the pH regulator is sulfuric acid, polyvinyl alcohol, sodium silicate and A mixture of sodium carbonate; the lubricant is graphite powder or silicon dioxide nano-microspheres;

[0038] Among them, according to weight measurement, 5-8 parts of bentonite, 2-3 parts of viscosifier, 2-3 parts of fluid loss reducer, 3-5 parts of flow pattern regulator, 2-5...

Embodiment 2

[0050] combine image 3 , the preparation method of photomodified powder is as follows:

[0051] Step A, mixing industrial zinc oxide or titanium dioxide powder with 10 times the volume of water, wherein the purity of zinc oxide and titanium dioxide raw materials is higher than 98%;

[0052] Step B. Place the mixed product of step A in a stirrer to stir it at a high speed, and then place it under an infrared pulse laser for ablation preparation. The single pulse energy of the laser is required to be greater than 100J / cm2, and the laser repetition frequency is greater than 500Hz , the ablation time is greater than 10 hours, and processed until the particle size is less than 200nm;

[0053] Step C, drying the product in step B.

Embodiment 3

[0055] combine figure 2 , the preparation method of photomodified powder is as follows:

[0056] Step A, mixing industrial zinc powder or titanium powder with 15 times the volume of water, wherein the purity of the zinc powder and titanium powder raw materials is higher than 95%;

[0057] Step B. Place the mixed product of step A in a stirrer to stir it at a high speed, and then place it under an infrared pulse laser for ablation preparation. The single pulse energy of the laser is required to be greater than 100J / cm2, and the laser repetition frequency is greater than 500Hz , the ablation time is more than 10 hours, and the processing is until the particle size is less than 200nm; the water temperature is kept below 30°C during ablation;

[0058] Step C, drying the product in step B.

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Abstract

The invention relates to a modified bentonite drilling fluid for well drilling and a preparation method thereof. According to the preparation method, raw materials containing bentonite and light modified powder are subjected to freeze-thaw cycle stirring for multiple times, water loss is carried out at a low temperature, so that the connection strength of molecules in the raw materials is furtherreduced, the light modified powder and the bentonite raw materials are mixed more fully after water loss, nanoscale contact is achieved, and the adjusting effect can be improved during tackifying andother adjustment; the surface charge property of the raw materials can be adjusted by further modifying in a sunlight exposure or ultraviolet irradiation manner, so that after a surfactant tackifier,a flow pattern regulator, a pH regulator and the like are added later, the slurry forming speed is high, the slurry forming rate is high, the sand wrapping capability is high, the filter loss is low,and the stability is better; the preparation method of the used light modified powder is a laser ablation method, no other raw material is introduced in the preparation process, metal or oxide thereofcan be directly ablated to obtain a product, and the light modified powder is high in yield, safe, free of pollution, free of influence on modification of bentonite and suitable for other industrialapplications.

Description

technical field [0001] The invention relates to the field of bentonite, in particular to a modified bentonite drilling fluid for well drilling and a preparation method. Background technique [0002] Bentonite is a non-metallic mineral with montmorillonite as the main mineral component. The montmorillonite structure is a 2:1 crystal structure composed of two silicon-oxygen tetrahedra sandwiching a layer of aluminum-oxygen octahedron. Due to the formation of montmorillonite unit cells There are some cations in the layered structure, such as Cu, Mg, Na, K, etc., and the interaction between these cations and the montmorillonite unit cell is very unstable, and they are easily exchanged by other cations, so they have good ion exchange properties. Due to its specific layered structure, it has a large specific surface area, so it has strong adsorption. At the same time, due to the existence of hydrophilic group OH, it has excellent dispersion, suspension and bonding in aqueous solut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24
CPCC09K8/24C09K2208/10C09K2208/34
Inventor 张平武方吸云杨世书李应平
Owner WUHU FEISHANG NONMETAL MATERIAL
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