Plugging agent for oil-base drilling fluid and preparation method

A technology of oil-based drilling fluid and plugging agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as door sealing, poor temperature resistance, and unsatisfactory plugging effect, and achieve good plugging effect Effect

Inactive Publication Date: 2018-12-11
SINOPEC SSC +2
View PDF8 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical plugging has a good plugging effect on malignant leakage, but the chemical plugging reaction is more intense, the construction is complicated, and the risk is higher
The bridging plugging material has a simple construction process and low cost, and is the most commonly used in the field, but some materi

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

[0025] The plugging agent for oil-based drilling fluid is composed of flame-retardant sponge, cellulose fiber, modified diatomite, superfine calcium carbonate, and flexible graphite, and the amount of each component added to 100 parts of oil-based drilling fluid is by weight percentage for:

[0026] 0.4 parts of flame retardant sponge,

[0027] 0.2 part of cellulose fiber,

[0028] 8 parts of modified diatomaceous earth,

[0029] 10 parts of superfine calcium carbonate,

[0030] 8 parts of flexible graphite.

[0031] A method for preparing a lost circulation agent for oil-based drilling fluid, the implementation steps of which are as follows:

[0032] Add cellulose fibers (with a size of 10mm), modified diatomaceous earth, ultrafine calcium carbonate, and flexible graphite (200 mesh) in order in clear water, and stir continuously at high speed during the addition process, and finally add a flame-retardant sponge (the pore size of the sponge is The range is 10ppi, the size...

Embodiment 2

[0034] The plugging agent for oil-based drilling fluid consists of reticular sponge (the pore size of the sponge is 20ppi, and the size of the sponge block is 50mm), regenerated protein fiber (the size is 30mm), modified attapulgite, ultrafine calcium carbonate, flexible graphite ( 100 mesh), wherein the addition amount of each component in 100 parts of oil-based drilling fluid is by weight percentage:

[0035] 0.1 parts of mesh sponge,

[0036] Regenerated protein fiber 1.5 parts,

[0037] Modified attapulgite 3 parts,

[0038] 10 parts of superfine calcium carbonate,

[0039] 8 parts of flexible graphite.

[0040] A method for preparing a lost circulation agent for oil-based drilling fluid, the implementation steps of which are as follows:

[0041] Add regenerated protein fiber, modified attapulgite, ultrafine calcium carbonate, and flexible graphite in order in clean water, and stir continuously at high speed during the addition process, and finally add mesh sponge, and...

Embodiment 3

[0043] The plugging agent for oil-based drilling fluid consists of reticular sponge (the pore size of the sponge is 8ppi, and the size of the sponge block is 0.5mm), regenerated starch fiber (the size is 0.5mm), modified sepiolite, ultrafine calcium carbonate, flexible Graphite (300 mesh) composition, wherein the addition amount of each component in 100 parts of oil-based drilling fluid is by weight percentage:

[0044] 0.8 parts of mesh sponge,

[0045] 0.1 part of regenerated starch fiber,

[0046] Modified sepiolite 8 parts,

[0047] 5 parts of superfine calcium carbonate,

[0048] 3 parts of flexible graphite.

[0049] A method for preparing a lost circulation agent for oil-based drilling fluid, the implementation steps of which are as follows:

[0050] Add regenerated starch fiber, modified sepiolite, ultrafine calcium carbonate, and flexible graphite in the clear water in sequence, and stir continuously at high speed during the addition process, and finally add mesh ...

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

No PUM Login to view more

Abstract

The invention provides a plugging agent for an oil-base drilling fluid with high crack matching ability. The plugging agent is composed of elastic sponge, regenerated fiber, adsorbent, calcium carbonate superfine powder and flexible graphite. Specifically, the components in parts by weight added into 100 parts of oil-base drilling fluid are as follows: 0.1-0.8 part of elastic sponge, 0.1-1.5 partsof regenerated fiber, 3-8 parts of adsorbent, 5-10 parts of calcium carbonate superfine powder and 3-8 parts of flexible graphite. The plugging agent for the oil-base drilling fluid provided by the invention can easily enter into cracks and form bridges in the cracks; high-temperature resisting materials and high-temperature resisting inert materials are high in dispersity in the oil-base drilling fluid, so that the success rate of plugging can be effectively increased and the happening of re-leakage can be avoided; the plugging construction process is simplified by adopting the plugging agent; the plugging material has excellent temperature resistance, does not lose efficacy under high temperature and has an excellent plugging effect for fracture-cavity type leakage.

Description

technical field [0001] The invention relates to the field of chemical materials for oil drilling, in particular to a plugging agent for oil-based drilling fluid loss. Background technique [0002] Lost circulation is the phenomenon that various working fluids leak into the formation under the action of pressure difference during various downhole operations such as drilling, cementing and completion, testing or workover. Once lost circulation occurs, it will not only delay drilling time, lose drilling fluid, damage oil and gas layers, interfere with geological logging work, increase drilling costs, but also easily cause a series of complicated situations such as pipe sticking, blowout, and well collapse, and even lead to the scrapping of the wellbore. cause huge economic losses. At present, the commonly used plugging materials in the plugging construction are mostly permanent bridging plugging materials and chemical gel plugging materials. Chemical plugging mainly plays a p...

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): C09K8/42C09K8/03C09K8/32
CPCC09K8/03C09K8/32C09K8/426
Inventor 刘振东李公让周延军卜凡康周守菊张斌明玉广
Owner SINOPEC SSC
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