Unlock instant, AI-driven research and patent intelligence for your innovation.

Conductive cement formulation and application for use in well

A technology of hydraulic cement and cement composition, which is applied in the direction of drilling composition, chemical instruments and methods, etc., and can solve the problems of mechanical properties and long-term interlayer isolation characteristics, such as reduction and insufficiency

Inactive Publication Date: 2011-07-13
PRAD RES & DEV LTD
View PDF3 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of high-porosity systems is the significant reduction in mechanical properties and long-term interlayer isolation properties when compared to low-porosity cement samples
Therefore, the extended system is not considered an appropriate long-term solution for resistivity measurements in cased hole formations

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Conductive cement formulation and application for use in well
  • Conductive cement formulation and application for use in well
  • Conductive cement formulation and application for use in well

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0038] figure 2 The relationship between carbon black and cement resistivity is summarized. Two different studies were performed to determine the effect of carbon black on the resistivity of cement. Carbon black had little or no effect on cement resistivity in both studies.

example 2

[0040] The next study focused on the relationship between carbon fiber concentration and cement conductivity. image 3 and Figure 4 The results were pooled. exist image 3 Among them, the carbon fiber varies from 0 to 17kg / m3. exist image 3 In , the effect of carbon fiber (6 mm) on the resistivity of cement was measured while keeping the carbon black constant. To add 1kg / m 3 Starting with carbon fibers, the resistivity of cement decreases significantly. After curing for 30 days at 150°F, with 2kg / m 3 The cement resistivity of the carbon fiber is 1.61Ωm. at 10kg / m 3 A further increase was observed, but with a significant increase in viscosity, this concentration was considered unsuitable for oil well cementing applications. exist Figure 4 In , an additional study evaluated the effect of carbon fibers on cement resistivity in the case of cement samples including coarse-grained graphite (40% BWOB). Again, the addition of carbon fiber significantly reduced the cement...

example 3

[0043] Figure 6 and Figure 7 The effect of coarse graphite particles on the cement resistivity is plotted in . exist Figure 6 In , measurements were performed without carbon fibers. Coarse graphite has a significant effect on cement resistivity. Graphite at 20% BWOB had little or no effect on resistivity after curing at 150°F for 30 days. However, between 20–40% BWOB, there appears to be sufficient proximity between adjacent graphite particles in the cement matrix to enhance electrical properties.

[0044] Figure 7 The relationship between particulate graphite concentration and cement resistivity is illustrated. In this study, measurements were compared after curing at 150°F for 10 days. The effect of coarse graphite was first investigated in the absence of carbon fibers in the mixture. At the threshold (5kg / m 3 ) to add carbon fiber. In samples without carbon fibers, the addition of particulate graphite had a significant effect on resistivity. exhibited a thres...

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
diameteraaaaaaaaaa
electrical resistivityaaaaaaaaaa
Login to View More

Abstract

The invention provides a cement composition for cementing a well comprising: hydraulic cement, water, carbon fiber and graphite.

Description

technical field [0001] The present invention relates broadly to well cementing. More specifically, the present invention relates to an electrically conductive cementing composition and a method of packing said composition in an oil or gas well. Background technique [0002] Cement in oil and gas wells fills the annular gap between the drilled formation and the steel casing. The primary role of the cement is to provide long-term zonal isolation and casing string support. Interzonal isolation must be achieved during the life of the well and after well retirement. As such, cement has been used in oil well applications for over 70 years. Cement has great versatility as an engineering material, which demonstrates superior compressive and tensile strength, ductility, and flexibility over a wide range of densities...these values ​​vary based on the additives chosen during design. Conventional cements generally exhibit high resistivity and are generally considered good insulator...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467C04B28/02
CPCC09K8/467C04B28/02C04B14/022C04B14/024C04B14/386C04B20/0076
Inventor 罗伯特·威廉姆斯埃曼努尔·塞朗德特里·达摩尔米确尔·金特里
Owner PRAD RES & DEV LTD