Plugging agent for drilling fluid and preparation method thereof

A plugging agent and drilling fluid technology, applied in the field of drilling fluid plugging agent and its preparation, can solve problems such as poor expansion effect, oil and gas layer pollution, secondary or even multiple leakage, etc., to achieve good anti-collapse plugging, The effect of strong elasticity and large deformation

Inactive Publication Date: 2020-10-23
SOUTHWEST PETROLEUM UNIV
View PDF16 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The plugging agent made of existing materials does not have anti-slump performance, and the hydration expansion effect of mud shale is not good in the easily hydration loss zone, and it is prone to secondary or even multiple loss
Moreover, when there is good deformation, the expansion effect is poor, and when there

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The lost circulation agent for drilling fluid of the present embodiment comprises: by weight percentage, 30% bridging material mixture a and 70% filling material mixture b; Wherein, bridging material mixture a comprises particle diameter 6- 25 parts of 10-mesh rubber particles and rigid mineral particles, 20 parts of rubber particles and rigid mineral particles with particle diameters of 10-30 mesh respectively; filling material mixture b includes walnut shells and wood fibers with particle diameters of 30-60 mesh in parts by weight and microcrystalline cellulose powder respectively 4 parts, particle diameter is respectively 2 parts of 60-100 purpose walnut shell, wood fiber and microcrystalline cellulose powder.

Embodiment 2

[0053] The lost circulation agent for drilling fluid of the present embodiment comprises: by weight percentage, 30% bridging material mixture a and 70% filling material mixture b; Wherein, bridging material mixture a comprises particle diameter 6- 26 parts of 10 mesh rubber particles and rigid mineral particles respectively, 21 parts of rubber particles and rigid mineral particles with a particle diameter of 10-30 mesh respectively; the filling material mixture b includes walnut shells and wood fibers with a particle diameter of 30-60 mesh in parts by weight and microcrystalline cellulose powder respectively 5 parts, particle diameter is respectively 3 parts of 60-100 purpose walnut shell, wood fiber and microcrystalline cellulose powder.

Embodiment 3

[0055] The lost circulation agent for drilling fluid of the present embodiment comprises: by weight percentage, 30% bridging material mixture a and 70% filling material mixture b; Wherein, bridging material mixture a comprises particle diameter 6- 27 parts of 10 mesh rubber particles and rigid mineral particles respectively, 22 parts of rubber particles and rigid mineral particles with a particle diameter of 10-30 mesh respectively; the filling material mixture b includes walnut shells and wood fibers with a particle diameter of 30-60 mesh in parts by weight and microcrystalline cellulose powder respectively 6 parts, particle diameter is respectively 4 parts of 60-100 purpose walnut shell, wood fiber and microcrystalline cellulose powder.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention belongs to the field of petroleum engineering, and particularly relates to a plugging agent for drilling fluid and a preparation method thereof. The plugging agent for the drilling fluidis characterized by comprising a mixture a and a mixture b, wherein the mixture a comprises rubber particles and rigid mineral particles, and the mixture b comprises walnut shells, wood fibers and microcrystalline cellulose powder. The method comprises the following steps: (1) uniformly stirring the mixture a, (2) adding the mixture b into the mixture a for at least three times, and stirring for4-6 minutes every time, and (3) then stirring uniformly to obtain the plugging agent. The plugging agent has the effects of collapse prevention, high elasticity and large deformation quantity, has aninhibition effect on a leakage channel which is easy to hydrate, is beneficial to formation of a stable well wall, is compounded with other plugging materials, and has a relatively good collapse prevention and plugging effect.

Description

technical field [0001] The invention belongs to the field of petroleum engineering, and in particular relates to a plugging agent for drilling fluid and a preparation method thereof. Background technique [0002] Lost circulation is a ubiquitous phenomenon during drilling, and other downhole vicious accidents induced by it will cause great harm to drilling engineering, oil and gas field development and reservoir protection. It is not uncommon for major oil fields to abandon wells due to vicious lost circulation. To solve this problem, a plugging agent is added to the drilling fluid in engineering to temporarily seal the drilled layer, that is, to effectively prevent the drilling fluid and the harmful substances in the drilling fluid from entering the reservoir during the drilling process. After well completion, the lost circulation agent can be degraded by itself or removed by simple treatment. [0003] At present, in the plugging agents used in major oil fields, there are ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C09K8/42
CPCC09K8/426
Inventor 李方邢国庆冯朝阳
Owner SOUTHWEST PETROLEUM UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap