Fluid-Loss Additives

Fluid-Loss Additive for Oilwell Cement

A high-polymer fluid-loss additive for oilwell cementing. Through adsorption, viscosifying and plugging action it effectively controls slurry fluid loss, improves slurry rheology and stability, and secures cementing quality for onshore and offshore wells — with grades covering medium-, high- and ultra-high-temperature (up to 180 °C), retarded and salt-tolerant slurry designs.

APPLICATIONS

Application scenarios

01Primary cementing of onshore and offshore oil and gas wells
02Medium-, high- and ultra-high-temperature slurry designs, plus retarded and salt-tolerant systems
03Reservoir protection by minimizing slurry filtrate invasion

PERFORMANCE

Performance indicators

Table 1 — Physical & Chemical Requirements for Oilwell Cement Fluid-Loss Additive
Item	Specification
Item	Solid	Liquid
Appearance	Free-Flowing Powder	Homogeneous Liquid
Moisture % ≤	8.0	—
Solids Content % ≥		10.0
Fineness (Residue on 0.315 mm Sieve) % ≤	12.0	—

Product advantages — Excellent fluid-loss control: rapidly reduces cement slurry filtrate loss, minimizes formation contamination, and protects the reservoir.

Table 2 — Performance Requirements for Cement Slurry and Set Cement with Medium-Temperature Fluid-Loss Additive
Item	Specification
Item	First Grade	Second Grade
Fluid Loss mL ≤	50.0	150.0
Initial Consistency (80 °C, 46.5 MPa, 45 min) Bc ≤	30
Time from 40 to 100 Bc min ≤	30
Free Fluid % ≤	1.4
Compressive Strength (102 °C, 20.7 MPa, 24 h) MPa ≥	14.0

Table 3 — Performance Requirements for Cement Slurry and Set Cement with High-Temperature Fluid-Loss Additive
Item	Specification
Item	First Grade	Second Grade
Fluid Loss mL ≤	50.0	150.0
Initial Consistency (120 °C, 73.9 MPa, 61 min) Bc ≤	30
Time from 40 to 100 Bc min ≤	30
Compressive Strength (144 °C, 20.7 MPa, 24 h) MPa ≥	14.0

Table 4 — Performance Requirements for Cement Slurry and Set Cement with Ultra-High-Temperature Fluid-Loss Additive
Item	Specification
Fluid Loss mL ≤	50.0
Initial Consistency (180 °C, 115.0 MPa, 86 min) Bc ≤	30
Time from 40 to 100 Bc min ≤	30
Compressive Strength (206 °C, 20.7 MPa, 24 h) MPa ≥	14.0

Table 5 — Performance Requirements for Cement Slurry and Set Cement with Retarding Fluid-Loss Additive
Item	Specification
Fluid Loss mL ≤	100.0
Initial Consistency (80 °C, 46.5 MPa, 45 min) Bc ≤	30
Time from 40 to 100 Bc min ≤	30
Thickening Time min ≥	120
Free Fluid % ≤	1.4
Compressive Strength (102 °C, 20.7 MPa, 24 h) MPa ≥	14.0

Table 6 — Performance Requirements for Cement Slurry and Set Cement with Salt-Resistant Fluid-Loss Additive
Item	Specification
Fluid Loss mL ≤	100.0
Initial Consistency (80 °C, 46.5 MPa, 45 min) Bc ≤	30
Time from 40 to 100 Bc min ≤	30
Free Fluid % ≤	1.4
Compressive Strength (102 °C, 20.7 MPa, 24 h) MPa ≥	14.0

USAGE

Usage

Dry-blend with cement or pre-dissolve in mix water; typical dosage is 0.5%-2.0% by weight of cement (BWOC), depending on temperature class and the target fluid-loss value. Verify thickening time in the laboratory before field use.

PACKAGING

Packaging & delivery

25 kg/bag standard; export packaging available on request.

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Fluid-Loss Additive for Oilwell Cement

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