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Temperature-resistant and salt-resistant nano-imbibition agent and its synthesis method and application

A temperature-resistant, salt-resistant, synthetic method technology, applied in chemical instruments and methods, earth drilling, silicon organic compounds, etc., can solve weak physical effects, difficult low-permeability oil reservoir imbibition recovery effect, and interaction is easily damaged and other problems, to achieve the effect of good dispersion and stability, not easy to agglomerate, and large steric hindrance

Active Publication Date: 2022-04-12
山东聚星石油科技有限公司
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  • Application Information

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Problems solved by technology

[0004] The prior art discloses a new type of nano-osmotic synthesis and pressure-driven process research (Zhang Juntao et al., "Applied Chemical Industry" [J], Research Institute of Shaanxi Yanchang Petroleum (Group) Co., Ltd., 2021), which records The molecular structure of the nano-osmotic agent contains ester groups, which is easy to be hydrolyzed at high temperature to chemically decompose the nano-osmotic agent, and it is difficult to penetrate deep into low-permeability reservoirs to exert the effect of imbibition oil recovery
It also discloses the preparation of silica nanofluid and its study on the law of imbibition and oil discharge in ultra-low permeability reservoirs (Wang Xinke, "Master's Dissertation" [J], China University of Petroleum, 2018), the silica nanofluid used It is a combination of modified nano-silica and surfactant, because there is no covalent bond between the two, and there is only a weak physical interaction, so that the silica nano-fluid in the formation operation process, between the two The interaction is easily destroyed, so that the nanoparticles agglomerate, the particle size is far beyond the nanometer level, and it is difficult to synergistically exert the imbibition and oil drainage performance in low permeability reservoirs

Method used

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  • Temperature-resistant and salt-resistant nano-imbibition agent and its synthesis method and application
  • Temperature-resistant and salt-resistant nano-imbibition agent and its synthesis method and application
  • Temperature-resistant and salt-resistant nano-imbibition agent and its synthesis method and application

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preparation example Construction

[0044] 1.1 Preparation of lipophilic capillary

[0045] 1.1.1 Capillary specification: the standard capillary inner diameter is 0.5 mm, and ultrasonically treat with carbon tetrachloride, benzene: acetone: ethanol = 7:1.5:1.5 (volume ratio) for 30 minutes to remove surface organic matter;

[0046] 1.1.2 Then use dilute hydrochloric acid solution (1:10) and hydrofluoric acid solution (10%) for ultrasonication to roughen and activate the capillary surface for 30 min; use deionized water for ultrasonic cleaning to remove residual acid until pH>6.5, dry at 105°C;

[0047] 1.1.3 Prepare the aging oil according to the ratio. The aging oil is composed of crude oil: aviation kerosene: 90# asphalt = 2:5:3; completely immerse the treated capillary in the aging oil, and age at 60°C for 2 to 4 weeks ;

[0048] 1.1.4 Take out the capillary and infiltrate it with kerosene for 2 minutes to clean the asphalt deposited on the inner and outer walls of the capillary, as long as it does not aff...

Embodiment 1

[0075] 150g BrCH 2 CH 2 OSi(OCH 2 CH 3 ) 3 Add 50g of N-methylimidazole and 500g of tetrahydrofuran into a 1000mL airtight reactor. The airtight reactor is equipped with a thermometer and a condensation reflux device. Nitrogen is passed through to remove oxygen, and the temperature is raised to 50°C for reflux for 2 hours. Rotary evaporator evaporates After removing the solvent, intermediate 1 was obtained;

[0076] 70g intermediate 1, 105g C 4 h 9 OCH 2 CH 2 OCH 2 CH 2 OH was sequentially added to a 1000mL four-necked flask containing 420g of acetonitrile, and after being fully dissolved, 11.9g of a 30% KOH solution was added to the reaction system to adjust the pH of the system to 8, and the reaction temperature was reduced at 60°C Vacuumize the reaction for 2h to obtain intermediate 2;

[0077] 150g intermediate 2, 60g BrCH 2 COONa was sequentially added to 240g tetrahydrofuran, and then 0.135g of ionic liquid [Bmim]BF was added to the system 4 , after being full...

Embodiment 2

[0081] 150g BrCH 2 CH 2 OSi(OCH 2 CH 3 ) 3 Add 75g of N-methylimidazole and 375g of dimethyl sulfoxide into a 1000mL closed reactor. The closed reactor is equipped with a thermometer and a condensation reflux device. Nitrogen is used to remove oxygen, and the temperature is raised to 60°C for 3h under reflux. After the solvent is evaporated by the evaporator, the intermediate 1 is obtained;

[0082] 75g intermediate 1, 100g C 8 h 17 O(CH 2 CH 2 O) 4 CH 2 CH 2 OH was sequentially added into a 1000mL four-necked flask containing 300g of toluene. After fully dissolving, 11.6g of 30% ammonia solution was added to the reaction system to adjust the pH of the system to 9, and the reaction temperature was reduced at 70°C. Vacuum reaction for 3h to obtain intermediate 2;

[0083] 150g intermediate 2, 75g BrCH 2 COONa is added in the 200g acetonitrile successively, then adds the ionic liquid [Bmim][CF of 0.2125g in the system 3 SO 3 ], after being fully dissolved, react a...

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Abstract

The invention proposes a temperature-resistant and salt-resistant nano osmotic agent and its synthesis method and application, which belong to the technical fields of petroleum exploitation, transportation and chemical industry. The heat-resistant and salt-resistant nano osmotic agent provided by the invention uses BrCH 2 CH 2 OSi(OCH 2 CH 3 ) 3 , N-Methylimidazole, RO(CH 2 CH 2 O) n‑1 CH 2 CH 2 OH, BrCH 2 COONa is formed by step-by-step reaction of raw materials, and it can still exert excellent imbibition recovery effect in ultra-low permeability reservoirs with temperature ≤150°C and total salinity ≤32868mg / L.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, transportation and chemical industry, and relates to a temperature-resistant and salt-resistant nano-osmotic agent and its synthesis method and application. Background technique [0002] Due to the tight structure of oil-bearing formations, low air permeability, small pore throats, and difficulties in imbibition and seepage in low-permeability reservoirs, high injection pressure, small injection volume, and rapid decline in water injection efficiency can occur during water injection development, so normal injection cannot be performed. Cause poor mining effect. In the development of shale oil and gas and tight oil and gas, there are also technical problems such as low porosity, low permeability, and small matrix pore throats, mainly nano-micron. [0003] Conventionally, the enhanced recovery of shale oil and gas and tight oil and gas is realized by means of "compression" or "flood...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/58C07F7/04E21B43/22
CPCC09K8/58C07F7/04E21B43/16
Inventor 齐书磊杨姗李慎伟杨军陈文锋陈海燕李盼杜庆海周仲祥姚勇杜河新
Owner 山东聚星石油科技有限公司
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