Modified thermo-sensitive NIPAM bentonite and temperature response type drilling fluid

A bentonite and temperature-sensitive technology, applied in the field of modified temperature-sensitive NIPAM bentonite and temperature-responsive drilling fluids, can solve problems such as applications that have not been reported, and achieve reduced fluid loss, enhanced hydrophobicity, and enhanced plugging performance. Effect

Inactive Publication Date: 2019-01-18
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, temperature-responsive low-molecular-weight polymers are currently mainly used in drug control, sewage tre

Method used

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  • Modified thermo-sensitive NIPAM bentonite and temperature response type drilling fluid
  • Modified thermo-sensitive NIPAM bentonite and temperature response type drilling fluid
  • Modified thermo-sensitive NIPAM bentonite and temperature response type drilling fluid

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Experimental program
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Effect test

Embodiment 1

[0045] The preparation method of modified thermosensitive NIPAM bentonite of the present invention comprises the steps:

[0046] Step 1: Prehydration of bentonite

[0047] 4.5 g of bentonite and 100 g of deionized water were mixed and stirred for 12 hours to complete the prehydration of the bentonite to obtain a soil slurry.

[0048] Step 2: NIPAM modified bentonite

[0049] 3 g of N-isopropylacrylamide (NIPAM) crystals were added to the soil slurry, and magnetically stirred at a constant temperature at 30° C. for 12 hours to allow the NIPAM and hydrated bentonite to fully interact to obtain a mixed solution.

[0050] Step 3: Removing NIPAM molecules not adsorbed on the surface of bentonite

[0051] Centrifuge the mixed solution at a centrifugal speed of 8000 rpm, pour off the supernatant, and collect the bentonite in the lower layer. Based on the volume of bentonite after centrifugation, deionized water was added at a volume ratio of bentonite to water of 1:20, dispersed a...

Embodiment 2

[0056] The preparation method of modified thermosensitive NIPAM bentonite of the present invention comprises the steps:

[0057] Step 1: Prehydration of bentonite

[0058] 4.0 g of bentonite and 100 g of deionized water were mixed and stirred for 10 h to complete the prehydration of the bentonite to obtain a soil slurry.

[0059] Step 2: NIPAM modified bentonite

[0060] 3 g of N-isopropylacrylamide (NIPAM) crystals were added to the soil slurry, and magnetically stirred at a constant temperature at 30° C. for 10 hours to fully react the NIPAM and hydrated bentonite to obtain a mixed solution.

[0061] Step 3: Removing NIPAM molecules not adsorbed on the surface of bentonite

[0062] Centrifuge the mixed solution at a centrifugal speed of 6000 rpm, pour off the supernatant, and collect the bentonite in the lower layer. Based on the volume of bentonite after centrifugation, deionized water was added at a volume ratio of bentonite to water of 1:20, dispersed and diluted, and ...

Embodiment 3

[0067] The preparation method of modified thermosensitive NIPAM bentonite of the present invention comprises the steps:

[0068] Step 1: Prehydration of bentonite

[0069] 4.3 g of bentonite and 100 g of deionized water were mixed and stirred for 11 hours to complete the prehydration of the bentonite to obtain a soil slurry.

[0070] Step 2: NIPAM modified bentonite

[0071] 3 g of N-isopropylacrylamide (NIPAM) crystals were added to the slurry, and magnetically stirred at a constant temperature at 30° C. for 11 hours to allow the NIPAM and hydrated bentonite to fully interact to obtain a mixed solution.

[0072] Step 3: Removing NIPAM molecules not adsorbed on the surface of bentonite

[0073] Centrifuge the mixed solution at a centrifugal speed of 7000 rpm, pour off the supernatant, and collect the bentonite in the lower layer. Based on the volume of bentonite after centrifugation, deionized water was added at a volume ratio of bentonite to water of 1:20, dispersed and di...

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Abstract

The invention discloses modified thermo-sensitive NIPAM bentonite. NIPAM molecules are firmly adsorbed on montmorillonite minerals, and are inserted between bentonite mineral layers or adsorbed on thesurfaces of bentonite particles, and the bentonite particles responds to the temperature. A preparation method of the modified thermo-sensitive NIPAM bentonite comprises the following steps: pre-hydrating bentonite, adding an N-isopropyl acrylamide (NIPAM) crystal or low molecular weight poly N-isopropylacrylamide, performing constant-temperature magnetic stirring, sufficiently reacting NIPAM with hydrated clay to obtain a mixed solution, removing NIPAM molecules not adsorbed on the surface of the bentonite, and drying and crushing to prepare the modified thermo-sensitive NIPAM bentonite. Theinvention further discloses a temperature response type drilling fluid, which is prepared from the modified thermo-sensitive NIPAM bentonite, Lv-PAC, CMC, CaCO3 and water. The modified thermo-sensitive NIPAM bentonite can enhance the plugging property of a mud cake under the formation condition, reduce the filter loss of the drilling fluid, and improve the high temperature stability of drilling fluid rheology. The temperature response type drilling fluid has temperature responsibility, and has certain self repairing ability, and under a high temperature condition, the temperature response type drilling fluid has relatively high stability.

Description

technical field [0001] The invention relates to a modified temperature-sensitive NIPAM bentonite and a temperature-responsive drilling fluid, belonging to the technical field of drilling. Background technique [0002] Bentonite is an important industrial raw material, which can be used as decolorizer, suspending agent, stabilizer, catalyst, etc., and is widely used in agriculture, medicine, light industry, energy development and drilling and other fields. In particular, in the process of oil and gas drilling, bentonite can effectively reduce the fluid loss of drilling fluid, and improve the rock-breaking and rock-carrying performance of drilling fluid. In addition, the drilling fluid with bentonite as the main raw material can lose a large amount of water instantaneously under the action of formation pressure difference, and form a thin and dense mud cake on the wellbore, which can inhibit the hydration and collapse of the wellbore and surrounding rock formations. However, ...

Claims

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Application Information

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IPC IPC(8): C09K8/20C09K8/24
CPCC09K8/206C09K8/24
Inventor 蒲晓林董汶鑫王梓豪王红彬曾天杰邱筱媛周欣瑜卿成林尹启新高峰尹明宇
Owner SOUTHWEST PETROLEUM UNIV
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