Modification of fluorgypsum as cement retarder

2007 ◽  
Vol 22 (4) ◽  
pp. 745-748 ◽  
Author(s):  
Jinhua Wang ◽  
Xinya Yang ◽  
Degao Yu
Keyword(s):  
Cement Retarder

Research Status of Synthetic Oil Well Cement Retarder

2020 ◽  
Vol 14 ◽  
Author(s):  
Guo Zihan ◽  
Liu Ziyang ◽  
Liao Kai ◽  
Yang Xianghui
Keyword(s):  
Great Influence ◽  
Large Temperature ◽  
Strength Development ◽  
Cement Stone ◽  
Oil Well ◽  
Research Status ◽  
Synthetic Oil ◽  
Oil Well Cement ◽  
Cement Retarder ◽  
Well Cement

: Oil well cement retarder is an additive that can extend time for thickening cement slurry, which can ensure the safety of cement. At present, the oil well cement retarder is mainly composed of synthetic materials, which are mainly divided into three major categories: compound polymer, AMPS polymer and non-AMPS. In this paper, the research status of synthetic oil well cement retarder in recent years is reviewed, and its shortcomings and development trends are analyzed. It is pointed out that the shortage of synthetic retarder mainly lies in problems, including large temperature sensitivity, small temperature application range, abnormal thickening curve, great influence on high temperature settlement stability and cement stone strength development. The development direction of oil well cement retarder is mainly focused on developing intelligent retarder and degradable retarder to meet the cementing needs of oilfields and ensure cementing effect increasing steadily.

Production of carboxymethyl lignin from sugar cane bagasse: A cement retarder additive for oilwell application

2018 ◽  
Vol 116 ◽  
pp. 144-149 ◽  
Author(s):  
Paulo Henrique Silva Santos Moreira ◽  
Julio Cezar de Oliveira Freitas ◽  
Renata Martins Braga ◽  
Renata Mendonça Araújo ◽  
Miguel Angelo Fonseca de Souza
Keyword(s):  
Sugar Cane ◽  
Sugar Cane Bagasse ◽  
Cement Retarder

Experimental Study on Spray Materials at Low Temperature

2012 ◽  
Vol 466-467 ◽  
pp. 93-96
Author(s):  
Yue Zhong Lin ◽  
Yong Qiang Lai ◽  
Li Jie Zheng
Keyword(s):  
Experimental Study ◽  
Low Temperature ◽  
Experimental Research ◽  
Economic Performance ◽  
Polymer Fiber ◽  
Spray Process ◽  
Cement Retarder ◽  
High Crack ◽  
High Crack Resistance ◽  
Early Strength

According to the low temperature spray process, using double quick cement, retarder, water retaining agent, water reducing agent, polymer, fiber was investigated using orthogonal theory the feasibility of preparation of guniting material. Through the experimental research prepared early strength, high adhesiveness, high crack resistance, high economic performance of gunite material, its each index can meet the requirements of the application.

A Study of the Influence of FGD Gypsum Used as Cement Retarder on the Properties of Concrete

2011 ◽  
Vol 374-377 ◽  
pp. 1311-1319
Author(s):  
Peng Xuan Duan ◽  
Ye Zhang ◽  
Yuan Chao Miao ◽  
Ying Li
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Negative Influence ◽  
Slag Cement ◽  
Fgd Gypsum ◽  
Cement Retarder ◽  
Working Performance

This paper describes replacing natural gypsum with FGD gypsum as cement retarder, the influence on the working performance, compressive strength and admixture adaptability of concretes, which were prepared with fly ash cement, slag cement and ordinary Portland cement. The results indict the FGD gypsum instead of natural gypsum used as cement retarder has little difference on the working performance of concrete and additionally the FGD gypsum has no negative influence on the compressive strength and admixture adaptability of concretes.

Utilization of solidified phosphogypsum as Portland cement retarder

2012 ◽  
Vol 14 (3) ◽  
pp. 228-233 ◽  
Author(s):  
Weiguo Shen ◽  
Gejin Gan ◽  
Rui Dong ◽  
Hu Chen ◽  
Yu Tan ◽  
...  
Keyword(s):  
Portland Cement ◽  
Cement Retarder

Smart Retarder for Cementing Systems with Accelerated Set and Gel Strength Properties with Potential for Improved Operational Safety

2021 ◽  
Author(s):  
Klin Rodrigues ◽  
Auribel Dos Santos ◽  
Hans Oskarsson ◽  
Szymon Jankowski ◽  
Paul Ferm
Keyword(s):  
Compressive Strength ◽  
Setting Time ◽  
Operating Cost ◽  
Cost Savings ◽  
Gel Strength ◽  
Field Application ◽  
Strength Development ◽  
Cement Slurry ◽  
Cement Retarder

Abstract Cement retarders available in the market include the traditional lignosulfonates and synthetic copolymers. Commonly, lignosulfonates lack batch to batch reproducibility which hinders formulation consistency. Both lignosulfonates and synthetic polymers will retard the set of cement. However, their chemistry dictates that they also slow down setting time which increases waiting on cement time, thus increasing rig costs. This paper proposes a new smart cement retarder that overcomes these traditional negatives. A number of polymers were designed and synthesized aiming for a chemical able to retard the set of cement while also acting as an accelerator once the cement slurry was in place. These polymers were tested for cement retardation performance using a high-pressure high-temperature (HPHT) consistometer. Static Gel Strength Analyzers (SGSA) measurements were used to determine compressive strength development as well as static gel strength development while curing under downhole temperature and pressure conditions. The new smart cement retarder delivers cement retardation in the 125 - 350°F temperature range and can be used at higher temperatures using a co-retarder. This unique material delivers an accelerated set and attains 500 psi compressive strength very quickly which minimizes waiting on cement time. In addition, this new retarder builds static gel strength rapidly and minimizes gel transition time. Upscaling to field application, the top of the cementing column takes the longest to set. By having this inbuilt accelerator into the system, it allows the top of the column to set as fast as possible gaining the needed compressive strength at the weakest point of the cement column. This should ensure the quality of the cement job in comparison with conventional retarders with significant operating cost savings. The new smart cement retarder will simplify cementing formulations due to its flexibility in dosage range of the retarder within the slurry and improve the quality of the cement jobs. As a result, the proposed smart cement retarder can help with minimizing risk of failures during production and possibly improving safety.

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