3. Polymer system 

brief introduction

(1) It is mainly composed of polymer fluid loss reducer such as ZOC-G80L and ZOC-G86L, supplemented by other compatible additives. 

(2) Polymer fluid loss additive is a kind of binary or multicomponent copolymer material with AMPS (2-acrylamido-2-methylpropane sulfonic acid) as the main monomer.

(3) Adding additives with special functions can make cement slurry system with corresponding functions to meet the cementing requirements of different well conditions. 

Form 

Oil well cement: grade G 

Fluid loss reducer: ZOC-G80L, ZOC-G86L, ZOC-G87L, etc., dosage 3-7% (BWOC) 

Dispersant: ZOC-F44L, ZOC-F46L, dosage 0.3-2.5% 

Defoamer: ZOC-X60L, ZOC-F46L, dosage 0.2-0.5% 

Mixing water: seawater or fresh water 

According to the performance requirements of cement slurry, optional materials can be added to cement slurry 

Retarder: ZOC-H21L, ZOC-H42L, ZOC-H50L 

Accelerator: ZOC-A90L, ZOC-DA93L 

Expansion agent: ZOC-B10, ZOC-B20, etc 

Gas channeling inhibitor: ZOC-GR5

Admixtures: ZOC-P61, ZOC-C81, ZOC-C82, etc 

characteristic: 

(1) Good control of water loss performance, free liquid is zero;

(2) Excellent salt tolerance; 

(3) Good temperature universality, can be used in the temperature range of room temperature to 180 ℃. 

(4) It has good dispersing effect and good rheological property without dispersant;

(5) The strength of cement paste develops well. 

(5) Strong anti pollution ability

Formula performance:

Typical slurry formula: 

100% G grade cement + seawater + 5% amps fluid loss additive + 0.5% ZOC-CH211L + 0.3% ZOC-X60L

Key points of system use and maintenance:

(1) When the temperature is lower than 110 ℃, it is recommended to use medium temperature retarder with dosage of 0.3-2%; when the temperature is higher than 110 ℃, it is recommended to use high temperature retarder with dosage of 1-4%.

(2) ZOC-G80L and ZOC-G86L are recommended for seawater cement slurry system with temperature less than 110 ℃, and ZOC-G87L is recommended for seawater cement slurry system with temperature greater than 110 ℃, and fresh water is used for slurry preparation.

In the case of good rheology, dispersant is not suitable.