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Synthesis of temperature and pH dual-stimulation-responsive nano hydrogel and water-based drilling fluid

A dual-stimuli-responsive, nano-hydrogel technology, applied in the field of water-based drilling fluids, can solve problems such as wellbore instability

Inactive Publication Date: 2021-09-10
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of well wall instability caused by conventional plugging agents unable to effectively plug nano-fractures in mud shale, the present invention provides a nano hydrogel plugging agent with a particle size of Nano-scale, can effectively seal nano-scale fractures in shale formations, so as to achieve the purpose of stabilizing the borehole wall
And developed a new nano-blocking water-based drilling fluid that can be applied to shale formations to replace oil-based drilling fluid, which can solve the problems of wellbore stability and reservoir pollution.

Method used

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  • Synthesis of temperature and pH dual-stimulation-responsive nano hydrogel and water-based drilling fluid
  • Synthesis of temperature and pH dual-stimulation-responsive nano hydrogel and water-based drilling fluid
  • Synthesis of temperature and pH dual-stimulation-responsive nano hydrogel and water-based drilling fluid

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Effect test

Embodiment 1

[0029] Dry the nano-silica in a vacuum drying oven at 75°C for 14 hours, accurately weigh 2 g of the dried nano-silica, add it to 40 mL of ethanol / water dispersion (volume ratio is 4.5:1), and disperse by ultrasonic for 45 minutes , then add 2g KH570 dropwise while stirring, react at 75°C for 11h, wash with ethanol, repeat 4 times, and finally place in a vacuum oven at 55°C for 7h to obtain modified nano-silica.

[0030] Weigh 0.17g of modified nano-silica and put it in a beaker, add 50ml of distilled water and ultrasonically disperse it for 10min, then transfer it to the reactor, weigh 1.54g of N-isopropylacrylamide, 0.15g of acrylic acid and N,N - Dissolve 0.03g of methylene acrylamide in deionized water and transfer them into the reactor, and stir them magnetically for 2 hours; after raising the temperature of the reactor to 60°C, add 0.06g of potassium persulfate to the reaction system and react for 6 hours; After natural cooling, wash with distilled water until the pH is ...

Embodiment 2

[0032] Dry nano-silica in a vacuum oven at 80°C for 13 hours, accurately weigh 2.5 g of dried nano-silica, add it to 50 mL of ethanol / water dispersion (volume ratio 5:1), and ultrasonically disperse 50min, then add 2.5g KH570 dropwise while stirring, react at 80°C for 12h, wash with ethanol, repeat 5 times, and finally dry in a vacuum oven at 60°C for 8h to obtain modified nano-silica.

[0033] Weigh 0.25g of modified nano-silica and place it in a beaker, add 50ml of distilled water and ultrasonically disperse it for 10min, then transfer it to the reactor, 1.27g of N-tert-butylacrylamide, 0.17g of allylamine and N,N- Dissolve 0.38g of octamethylenebisacrylamide in deionized water and transfer to the reactor, then pass through nitrogen for 25 minutes to remove oxygen; after the reactor is heated to 60°C, add 0.08g of ammonium persulfate to the reaction system React for 7 hours; after the reaction system is naturally cooled, wash with distilled water until the pH is 7, soak in d...

Embodiment 3

[0035] The configuration of water-based drilling fluid: based on 100 parts by weight of fresh water, the present embodiment illustrates the formula of water-based drilling fluid by the following method. The specific formula of water-based drilling fluid is as follows: 100 parts by weight of water+4 parts by weight of bentonite+0.2 parts by weight Parts of NaOH+0.02 parts by weight of KPAM+0.4 parts by weight of PAC-LV+5 parts by weight of RSTF+5 parts by weight of SMP-1+5 parts by weight of FRH+1 part by weight of PPL+4 parts by weight of FK-10+0.4 parts by weight of SP-80 +1.2 parts by weight desulfurizer+0.4 parts by weight CaO+10 parts by weight barite.

[0036] 1) Prehydration of bentonite slurry

[0037] At room temperature, add 4 parts by weight of bentonite evenly into 100 parts by weight of tap water while stirring, then add 0.2 parts by weight of soda ash, stir for 30 minutes at a speed of 2000 r / min, seal and let stand for 24 hours , to obtain pre-hydrated bentonite...

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Abstract

The invention discloses synthesis of temperature and pH dual-stimulation-responsive nano hydrogel and a water-based drilling fluid. A plugging agent used by the water-based drilling fluid is temperature and pH dual-stimulation-responsive nano-hydrogel, and the temperature and pH dual-stimulation-responsive nano-hydrogel is prepared from the following synthetic raw materials: nano-silica, a temperature-responsive monomer, a pH-responsive monomer, a cross-linking agent and an initiator. The water-based drilling fluid contains the temperature and pH dual-stimulation-responsive nano hydrogel disclosed by the invention. The temperature and pH dual-stimulation-responsive nano hydrogel is used as a nano blocking agent, the particle size distribution ranges from 20 nm to 75 nm, nano-sized pores in a shale well wall can be effectively blocked, and therefore the well wall can be effectively stabilized, and collapse can be prevented; and the water-based drilling fluid used in the invention has good rheological property, stability, plugging property and the like under the shale formation condition.

Description

technical field [0001] The invention relates to the technical field of drilling in oil and gas fields, in particular to a water-based drilling fluid containing a nanometer hydrogel that responds to dual stimulations of temperature and pH. Background technique [0002] During the drilling of shale gas horizontal wells, wellbore instability has always been a technical problem plaguing oil drilling. Due to the strong water sensitivity of shale and the development of formation fractures, how to use drilling fluid technology to inhibit the hydration expansion of mud shale clay, seal the fine, micro-nano pores and fractures of shale, prevent drilling fluid or filtrate from entering the formation, and reduce the hydration caused by hydration. Or the impact of capillary force on shale formations, preventing shale borehole wall collapse fundamentally solves the wellbore stability problem in shale drilling. Therefore, effectively inhibiting hydration and sealing fractures has become ...

Claims

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Application Information

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IPC IPC(8): C08F220/54C08F220/06C08F222/38C08F226/02C08K9/06C08K7/26C08J3/075C08L33/24C09K8/03C09K8/035C09K8/24C09K8/46C09K8/48
CPCC08F220/54C08K9/06C08K7/26C08J3/075C09K8/03C09K8/035C09K8/24C09K8/426C09K8/46C09K8/48C09K2208/10C09K2208/12C08K2201/011C08J2333/24C08F220/06C08F222/385C08F226/02
Inventor 谢刚范莉邓明毅罗玉婧陈宇雷震谢冬蕊沈凌风余中慧
Owner SOUTHWEST PETROLEUM UNIV
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