Plugging agent while drilling, preparation method of plugging agent while drilling and application of plugging agent while drilling in water-based drilling fluid

A technology of water-based drilling fluid and plugging while drilling, which is applied in the field of drilling fluid and can solve problems such as formation loss

Inactive Publication Date: 2021-05-11
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, hydraulic fractures caused by high pressure will also affect formation loss

Method used

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  • Plugging agent while drilling, preparation method of plugging agent while drilling and application of plugging agent while drilling in water-based drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0038] This preparation example is used to illustrate the preparation method of water-based drilling fluid.

[0039] (1) 6 parts by weight of bentonite and 0.3 parts by weight of sodium carbonate were added to 100 parts by weight of water and stirred for 6 hours, and left to stand for 24 hours;

[0040] (2) Under high-speed stirring conditions, 0.6 parts by weight of coating agent PAC-141, 4 parts by weight of fluid loss additive, 4 parts by weight of inhibitor, 2 parts by weight of viscosity reducer, 3 parts by weight of high-efficiency Lubricants and 20 parts by weight of the weighting agent are added to the prehydrated base slurry.

Embodiment 1

[0042] This example is used to illustrate the preparation of lost circulation agent while drilling and its use in water-based drilling fluid.

[0043] (1) Mixing: first mix 35kg elastic graphite, 30kg calcium carbonate, 20kg coke particles and 15kg vermiculite evenly;

[0044] (2) Grinding: Grinding the mixture prepared in step (1) in a HGM80 mill until the particle size is 1 μm to 800 μm;

[0045] (3) Stirring: 60kg and 20kg of asbestos fibers and 20kg of mica flakes in the mixture prepared in step (2) are stirred evenly in a mixer to obtain the finished product.

[0046] In step (2), the particle size of the grinding is proportioned in the following manner: particles with a particle size between 1 and 500 μm account for 58 to 62% of the total volume, and particles with a particle size between 1 and 600 μm account for 58% of the total volume. 80-84%, and particles with a particle size between 1-700 μm account for 91-95% of the total volume.

[0047] In step (3), the length ...

Embodiment 2

[0051] This example is used to illustrate the preparation of lost circulation agent while drilling and its use in water-based drilling fluid.

[0052] (1) Mixing: first mix 34kg elastic graphite, 31kg calcium carbonate, 19kg coke particles and 16kg vermiculite evenly;

[0053] (2) Grinding: Grinding the mixture prepared in step (1) in a HGM80 mill until the particle size is 1-800 μm;

[0054] (3) Stirring: 60kg and 20kg of asbestos fibers and 20kg of mica flakes in the mixture prepared in step (2) are stirred evenly in a mixer to obtain the finished product.

[0055] In step (2), the particle size of the grinding is proportioned in the following manner: particles with a particle size between 1 and 500 μm account for 58 to 62% of the total volume, and particles with a particle size between 1 and 600 μm account for 58% of the total volume. 80-84%, and particles with a particle size between 1-700 μm account for 91-95% of the total volume.

[0056] In step (3), the length of the...

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Abstract

The invention discloses a plugging agent while drilling, a preparation method of the plugging agent while drilling and an application of the plugging agent while drilling in water-based drilling fluid, the plugging agent is composed of a particle mixture, asbestos fibers and mica sheets, and the mass ratio of the particle mixture to the asbestos fibers to the mica sheets is 60: 20: 20. the particle mixture is prepared from 34 to 36 parts of elastic graphite, 29 to 31 parts of calcium carbonate, 19 to 21 parts of coke particles and 14 to 16 parts of vermiculite. The plugging agent while drilling can be applied to formation leakage of pores and micro-cracks in a drilling well, and can quickly form a mud cake to plug the micro-cracks in the formation, so that the purposes of leakage prevention while drilling and plugging are achieved. The drilling fluid additive can be well dispersed into the drilling fluid, and has small influence on the viscosity and shearing force of the drilling fluid. The plugging agent while drilling disclosed by the invention can be applied to plugging leakage of a micro-crack stratum, has better filling, bridge plugging or plugging effects, prevents mutual replacement between oil gas and well slurry, reduces the leakage amount and reduces the well control risk.

Description

technical field [0001] The invention belongs to the technical field of drilling fluid, and in particular relates to a lost circulation agent while drilling, a preparation method of the lost circulation agent while drilling and its application in water-based drilling fluid. Background technique [0002] Lost circulation refers to the phenomenon that various working fluids such as drilling fluid, cement slurry, completion fluid and other fluids leak into the formation under the action of pressure difference during various downhole operations such as drilling, cementing and testing. Lost circulation is the most common and common technical problem in drilling engineering. Lost circulation will induce many problems such as waste of drilling time, loss of drilling fluid, damage of reservoir and instability of wellbore wall, and well collapse and blowout caused by lost circulation. The problem is also a worldwide problem in the process of oil and gas exploration and development for...

Claims

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Application Information

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IPC IPC(8): C09K8/03C09K8/16
CPCC09K8/032C09K8/16C09K2208/08
Inventor 章晓龙梁大川
Owner SOUTHWEST PETROLEUM UNIV
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