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

Cement slurries, cured cement and methods of making and use thereof

A technology for cement slurry and cement, which is applied in the preparation and use of cement slurry and solidified cement with at least two retarder additives, and the field of solidified cement and preparation of solidified cement, can solve the problem of difficulty in uniform placement of slurry, poor fluidity, and thickening. fast time problem

Pending Publication Date: 2021-07-23
SAUDI ARABIAN OIL CO
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fast thickening time of the slurry, conventional cement solutions may gel quickly, resulting in poor flow, and create problems when handling or pumping the cement, as uniform placement of the slurry may be difficult
In addition, cement slurries are often incompatible with other fluids that may be present in the casing or wellbore wall, such as drilling fluids, and prolonged contact can cause the cement slurry to gel, preventing proper cement placement and removal

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
  • Cement slurries, cured cement and methods of making and use thereof
  • Cement slurries, cured cement and methods of making and use thereof
  • Cement slurries, cured cement and methods of making and use thereof

Examples

Experimental program
Comparison scheme
Effect test

example

[0067] A basic slurry was formed, the composition of which is shown in Table 1. Saudi G grade cement contains 60% to 100% Portland cement and less than 3% crystalline silica.

[0068] Table 1: Basic slurry composition

[0069] components amount (g) Concentration (BWOC) Saudi G grade cement 785 Silica fume 275.5 35wt.% Hydroxyethyl cellulose 1.48 0.2wt.% water 520

[0070] Using the slurry composition in Table 1 as the base composition, various slurry samples were formed by adding retarders, as detailed in Table 2. These various samples were then tested for thickening time and their compressive strength over time when they were cured under downhole temperature and pressure conditions. This change in compressive strength was measured using a Chandler 4265-HT Ultrasonic Cement Analyzer (UCA) according to API Recommended Practice 10B-2.

[0071] Table 2: Thickening Time (TT) and Ultrasonic Cement Analysis (UCA) at 400°F for Invent...

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 diameteraaaaaaaaaa
Login to View More

Abstract

Cement slurries, cured cements, and methods of making cured cement and methods of using cement slurries are provided. The cement slurries have, among other attributes, an extended thickening time, leading to improved retardation, flowability, and pumpability and may be used, for instance, in the oil and gas drilling industry. The cement slurry comprises water, a cement precursor material, acrylic acid copolymer, zinc oxide, and a phosphonic acid-based thickener.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application Serial No. 62 / 771,369, filed November 26, 2018, which is incorporated by reference into this disclosure in its entirety. technical field [0003] Embodiments of the present disclosure relate generally to cement slurries and methods of making and using cement slurries as well as curing cement and methods of making cured cement. In particular, embodiments of the present disclosure relate to grouts and cured cements having at least two retarder additives, and methods of making and using grouts and cured cements having at least two retarder additives. Background technique [0004] Cement slurries are used in the oil and gas industry, such as for cementing in oil and gas wells. For example, primary, salvage, squeeze and plug cementing techniques can be used to place a cement sheath in the annulus between the casing and the well formation to workover, st...

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): C04B28/02C09K8/467
CPCC09K8/467C04B28/02C04B14/30C04B24/003C04B24/161C04B24/2641C04B2103/0025C04B2103/20C04B2103/44C04B7/02C04B14/04
Inventor 彼得·J·博尔
Owner SAUDI ARABIAN OIL CO