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Lost circulation drilling fluid system and preparation method based on hydrophobic bridging particles

A hydrophobic and granular technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of borehole wall expansion and collapse, affecting the effect of plugging, etc., to restore productive reservoirs, improve plugging tightness, Easy to unblock effect

Inactive Publication Date: 2020-08-11
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the inventors found that there are at least the following technical problems in sealing the formation by increasing the content of fluid loss control agent or plugging agent: when the drilling fluid is in contact with the wellbore formation for a long time, because the drilling fluid is usually hydrophilic, it will make the well The wall swells and collapses after being soaked in water for a long time, which affects the plugging effect

Method used

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  • Lost circulation drilling fluid system and preparation method based on hydrophobic bridging particles
  • Lost circulation drilling fluid system and preparation method based on hydrophobic bridging particles
  • Lost circulation drilling fluid system and preparation method based on hydrophobic bridging particles

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Embodiment 1

[0032] The embodiment of the present invention provides a plugging drilling fluid system based on hydrophobic bridging particles, which is composed of sodium bentonite, caustic soda, soda ash, thickener, filtrate reducer, hydrophobic heavy calcium carbonate, asphalt, limestone powder, The unidirectional pressure shielding agent and the weighting agent used to adjust the density of the system are mixed with water.

[0033] Among them, the content of the treatment agent: 3.0%-5.0%wt sodium bentonite, 0.2%-0.4wt% caustic soda, 0.1%-0.4%wt soda ash, 0.2%-0.5%wt tackifier, 3.0%-5.0%wt reduction Fluid loss agent, 20.0%~30.0%wt hydrophobic heavy calcium carbonate, 1.0%~3.0%wt asphalt, 2.0%~4.0%wt limestone powder, 1.0%~3.0% unidirectional pressure shielding agent, used to adjust the system density The weighting agent; the balance is water, and the basis of the mass content of each component is the volume of water.

[0034] In the embodiment of the present invention, the indicators of eac...

Embodiment 2

[0040] The hydrophobic heavy calcium carbonate provided by the embodiment of the present invention is obtained by modifying the hydrophilic heavy calcium carbonate with a modifier, wherein the modifier is bis(4-alkoxy-3-benzenesulfonate triethanolamine ) Methane.

[0041] Wherein, the molecular structure of the modifier is:

[0042]

[0043] Wherein, the preparation method of the modifier is:

[0044] Step 1): Add dichloromethane and bisphenol F into the reaction vessel, then add potassium hydroxide and cetyltrimethylammonium bromide while stirring. After heating, add bromooctadecane and stir while stirring. Heat until the reaction is complete, and after the system is cooled, the reaction product is hot filtered to remove salt and purify to obtain the bisether intermediate;

[0045] Step 2): Add dichloromethane to the flask equipped with HCl absorption device, add the bisether intermediate prepared in step 1) while stirring, slowly add chlorine dropwise with a constant pressure dropp...

Embodiment 3

[0051] The embodiment of the present invention provides a preparation method of hydrophobic heavy calcium carbonate, the method is:

[0052] After mixing the hydrophilic heavy calcium carbonate powder and the modifier, they are slowly added to a continuous powder modifier, and modified at a temperature of 100°C to 130°C for 15-25 minutes to obtain hydrophobic heavy calcium carbonate.

[0053] Wherein, the amount of the modifier is 3% of the mass of the hydrophilic heavy calcium carbonate powder. Among them, the continuous powder modifier is an SLG type continuous powder modifier.

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Abstract

The invention provides a drilling fluid plugging system based on hydrophobic bridge blinding particles and a production method. The drilling fluid plugging system based on the hydrophobic bridge blinding particles is produced by mixing sodium bentonite, caustic soda, sodium carbonate, a tackifier, a filtrate reducer, hydrophobic ground calcium carbonate, pitch, limestone flour, a unidirectional pressure shielding agent, a weighing agent used for adjusting system density and water. According to the drilling fluid plugging system based on the hydrophobic bridge blinding particles and the production method, the bridge blinding material hydrophobic ground calcium carbonate modified through a modifier is added into the drilling fluid plugging system, by compounding treatment agents of the hydrophobic ground calcium carbonate, the sodium bentonite, the tackifier, the filtrate reducer, the pitch, the unidirectional pressure shielding agent and the like, a bridge is built in a loss space of astratum, and a dense hydrophobic plugging layer is formed to effectively reduce loss of the stratum.

Description

Technical field [0001] The invention relates to the technical field of oil and natural gas drilling, in particular to a plugging drilling fluid system based on hydrophobic bridging particles and a preparation method. Background technique [0002] Drilling loss refers to a phenomenon in which the drilling fluid in the wellbore enters the formation due to the pressure difference between the drilling fluid and the formation during the oil and gas exploration and development process. Lost circulation is a complicated downhole situation that often occurs in drilling operations. It can occur in shallow, medium and deep formations, as well as in various lithological formations. Once the drilling fluid loss occurs, it will not only delay the drilling time and damage the oil and gas reservoirs, but also may cause a series of problems such as well collapse, sticking, blowout, etc., causing significant economic losses. Therefore, selecting an appropriate drilling fluid system is an importa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/22
Inventor 李志勇李强王苏南王晓飞张申申张浩东王玥李新岗
Owner CHINA UNIV OF PETROLEUM (BEIJING)