A kind of plugging agent for drilling fluid and preparation method thereof

Abstract

The invention discloses a blocking agent for drilling fluid and a preparation method thereof. The blocking agent for the drilling fluid is prepared from a thermosensitive deformation hydrophobic material, a thermosetting hydrophobic material, a rigid solid particle material, vegetable oil and solvent oil. The preparation method comprises the steps that the mixture of the thermosetting hydrophobic material and the plant oil is added into the cooled thermosensitive deformation hydrophobic material, sufficient stirring is carried out, the rigid solid particle material and the solvent oil are added, and then sufficient stirring is carried out. The blocking agent can effectively block various holes and microcracks with the diameters smaller than 20 micrometers, the permeability of the holes and the microcracks is lowered from 10<-5> md to 10<-6> and even 10<-7> md, and the filter loss is reduced; the blocking agent is easy to disperse and suspend in the drilling fluid without agglomeration or sedimentation, contains no emulsifying agent, can be used in drilling fluid in a water station, can also be used in drilling fluid in an oil station, and has the blocking and anti-sloughing acting effects. The preparation method is easy and convenient to implement, low in cost and applicable to industrial large-scale production.

Description

technical field

[0001] The invention relates to the field of oil and gas drilling, in particular to a plugging agent for drilling fluid and a preparation method thereof. Background technique

[0002] Well collapse is one of the most serious hazards in oil and gas drilling engineering. Wellbore stability in shale formations in oil and gas drilling has always been an important responsibility of drilling fluids. Years of drilling fluid anti-collapse technology research has shown that wellbore instability is closely related to the invasion of drilling fluid filtrate in the wellbore. Preventing the penetration of drilling fluid filtrate into the shale well wall is the key point of drilling fluid anti-collapse technology. Although the filter cake of drilling fluid can greatly reduce the penetration rate and percolation rate of wellbore drilling fluid into formation pores or fractures, the filter cake formed by the action of drilling fluid fluid loss control agent If it is chang...

Examples

Embodiment 1

[0040] Embodiment 1: a kind of plugging agent for drilling fluid, it is made up of following raw material of heavy part:

[0041]

[0042]

[0043] The preparation method of plugging agent for above-mentioned drilling fluid, it may further comprise the steps:

[0044] S1. Ingredients according to the proportion of the above formula, set aside;

[0045] S2. Add natural solid asphalt particles into the container, heat to 130°C, add one-third volume of No. 5 white mineral oil to dilute, and cool the diluted natural solid asphalt particles to 100°C;

[0046] S3. Heat the rosin particles in a heating kettle to 250°C, add castor oil and continue heating for 1h, heat to 280°C, then stir and cool to 200°C;

[0047] S4. Add the mixture of rosin granules and castor oil obtained in step S3 to the natural solid asphalt granules cooled in step S1, fully stir, add calcium carbonate granules and No. 5 white mineral oil of the remaining 2 / 3 volume, and stir evenly , to make a plugging...

Embodiment 2

[0048] Embodiment 2: a kind of plugging agent for drilling fluid, it is made up of following raw material of heavy part:

[0049]

[0050] The preparation method of plugging agent for above-mentioned drilling fluid, it may further comprise the steps:

[0051] S1. Ingredients according to the proportion of the above formula, set aside;

[0052] S2. Add natural solid asphalt particles into the container, heat to 180°C, add 1 / 4 volume of No. 5 white mineral oil to dilute, and cool the diluted natural solid asphalt particles to 130°C;

[0053] S3. Heat the rosin particles in a heating kettle to 280°C, add castor oil and continue heating for 3h, heat to 320°C, then stir and cool to 240°C;

[0054]S4. the mixture of the rosin particles and castor oil obtained in step S3 is added in the natural solid asphalt particles cooled in step S1, fully stirred, adding calcium carbonate particles and No. 5 white mineral oil of three-quarter volume, stirred evenly, A plugging agent for dril...

Embodiment 3

[0055] Embodiment 3: a kind of plugging agent for drilling fluid, it is made up of following raw material of weight part:

[0056]

[0057] The preparation method of plugging agent for above-mentioned drilling fluid, it may further comprise the steps:

[0058] S1. Ingredients according to the proportion of the above formula, set aside;

[0059] S2. Add natural solid asphalt particles into the container, heat to 140°C, add 1 / 5 volume of No. 5 white mineral oil to dilute, and cool the diluted natural solid asphalt particles to 108°C;

[0060] S3. Heat the rosin particles in a heating kettle to 262°C, add castor oil and continue heating for 1.5h, heat to 290°C, then stir and cool to 210°C;

[0061] S4. Add the mixture of rosin granules and castor oil obtained in step S3 to the natural solid asphalt granules cooled in step S1, fully stir, add calcium carbonate granules and No. 5 white mineral oil No. 5 white of the remaining four-fifths volume Mineral oil, stirred evenly, to ...

technical field

[0001] The invention relates to the field of oil and gas drilling, in particular to a plugging agent for drilling fluid and a preparation method thereof. Background technique

[0002] Well collapse is one of the most serious hazards in oil and gas drilling engineering. Wellbore stability in shale formations in oil and gas drilling has always been an important responsibility of drilling fluids. Years of drilling fluid anti-collapse technology research has shown that wellbore instability is closely related to the invasion of drilling fluid filtrate in the wellbore. Preventing the penetration of drilling fluid filtrate into the shale well wall is the key point of drilling fluid anti-collapse technology. Although the filter cake of drilling fluid can greatly reduce the penetration rate and percolation rate of wellbore drilling fluid into formation pores or fractures, the filter cake formed by the action of drilling fluid fluid loss control agent If it is chang...

Examples

Embodiment 1

[0040] Embodiment 1: a kind of plugging agent for drilling fluid, it is made up of following raw material of heavy part:

[0041]

[0042]

[0043] The preparation method of plugging agent for above-mentioned drilling fluid, it may further comprise the steps:

[0044] S1. Ingredients according to the proportion of the above formula, set aside;

[0045] S2. Add natural solid asphalt particles into the container, heat to 130°C, add one-third volume of No. 5 white mineral oil to dilute, and cool the diluted natural solid asphalt particles to 100°C;

[0046] S3. Heat the rosin particles in a heating kettle to 250°C, add castor oil and continue heating for 1h, heat to 280°C, then stir and cool to 200°C;

[0047] S4. Add the mixture of rosin granules and castor oil obtained in step S3 to the natural solid asphalt granules cooled in step S1, fully stir, add calcium carbonate granules and No. 5 white mineral oil of the remaining 2 / 3 volume, and stir evenly , to make a plugging...

Embodiment 2

[0048] Embodiment 2: a kind of plugging agent for drilling fluid, it is made up of following raw material of heavy part:

[0049]

[0050] The preparation method of plugging agent for above-mentioned drilling fluid, it may further comprise the steps:

[0051] S1. Ingredients according to the proportion of the above formula, set aside;

[0052] S2. Add natural solid asphalt particles into the container, heat to 180°C, add 1 / 4 volume of No. 5 white mineral oil to dilute, and cool the diluted natural solid asphalt particles to 130°C;

[0053] S3. Heat the rosin particles in a heating kettle to 280°C, add castor oil and continue heating for 3h, heat to 320°C, then stir and cool to 240°C;

[0054]S4. the mixture of the rosin particles and castor oil obtained in step S3 is added in the natural solid asphalt particles cooled in step S1, fully stirred, adding calcium carbonate particles and No. 5 white mineral oil of three-quarter volume, stirred evenly, A plugging agent for dril...

Embodiment 3

[0055] Embodiment 3: a kind of plugging agent for drilling fluid, it is made up of following raw material of weight part:

[0056]

[0057] The preparation method of plugging agent for above-mentioned drilling fluid, it may further comprise the steps:

[0058] S1. Ingredients according to the proportion of the above formula, set aside;

[0059] S2. Add natural solid asphalt particles into the container, heat to 140°C, add 1 / 5 volume of No. 5 white mineral oil to dilute, and cool the diluted natural solid asphalt particles to 108°C;

[0060] S3. Heat the rosin particles in a heating kettle to 262°C, add castor oil and continue heating for 1.5h, heat to 290°C, then stir and cool to 210°C;

[0061] S4. Add the mixture of rosin granules and castor oil obtained in step S3 to the natural solid asphalt granules cooled in step S1, fully stir, add calcium carbonate granules and No. 5 white mineral oil No. 5 white of the remaining four-fifths volume Mineral oil, stirred evenly, to ...

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