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Supply of Polyanionic Cellulose
Reference: SSG9975L16/05 1/22/2016, Location: Asia
Category: Chemicals
Scope of Work
The company bids for the supply of 90,000 KG Polyanionic Cellulose - Superlo Grade (PAC-SL).
The Specifications are as follows:-
1. Physical Properties: The material, as received, should be a free flowing white to creamish/brownish white powder free from foreign matter and visible impurities.
2. Moisture content, measured by drying degC,% by mass, maximum : 15.00 at 105+/- 2.
3. Apparent viscosity of 1.0% (w/v) suspension of the material, as received, in fresh water and 4% salt water:
Prepare a 1% (w/v) suspension of the sample by stirring in a multimixer for 30 minutes in distilled water and 4% salt water (prepared by dissolving 4 gms of LR grade NaCl in 100 ml distilled water) and measure the apparent viscosity at 26+/- 2 degC by a Fann VG meter.
(i) Apparent viscosity in fresh water, cp, max.: 20
(ii) Apparent viscosity in salt water, cp, max.: 16
4. Yield of 15 cp apparent viscosity suspension:
Prepare a 15 cp apparent viscosity suspension of the sample by stirring in a multimixer for 30 minutes in distilled water and 4% salt water (prepared by dissolving 4 gms of LR rade NaCl in 100 ml distilled water) and calculate the yield of the sample which should be as follows :
(i) Yield in distilled water, KL/MT, minimum: 100
(ii) Yield in 4% salt water, KL/MT, minimum: 80
5. Sodium carboxymethyl cellusose content, on dry basis, % by mass, (on dry basis), minimum. : 85.00
6. Degree of substitution, minimum: 1.00
7. Performance test:
A. In fresh water mud –
(i) Preparation of base mud:
Prepare a 10.0% (w/v) suspension of OIL approved bentonite in distilled water and stir the suspension for 15 minutes in multimixer so that no lumps are left after the stirring period. Age the suspension for 72 hrs at 90+/-2 degC. After the lapse of the aging period, cool and adjust apparent viscosity in the range of 15-20 cp with distilled water. Also adjustPH in the range of 9.0-9.5 with 10% NaOH solution,if necessary. Stir the suspension for 15 minutes in multimixer and determine apparent viscosity, yield value and API fluid loss of the suspension at 26+/-2 degC which should be as follows.
(a) Apparent viscosity, cp: 15-20
(b) Yield value, lbs/100 ftsq: To determine
(c) API fluid loss, ml: To determine
(ii) Preparation of treated mud.
Treat the base mud 7A(i) with 0.5% (w/v) polyanionic cellulose (superlo grade) sample. Stir in a multimixer for 30 minutes and divide the mud into two parts.
Performance at 26+/- 2 degC
Measure apparent viscosity, yield value and API fluid loss of one part of the treated mud 7A(ii) at 26+/-2 degC which should be as follows.
(a) Apparent viscosity, cp, max. : 2.5 times of 7A,ia
(b) Yield value, lbs/100ftsq,max. : 1.5 times of 7A,ib
(c) API fluid loss, ml, max. : 50% of 7A,ic
Performance at 120+/-2 degC
Age second part of the treated mud 7A(ii) at 120 +/-2 degC in rolling condition for 24 hrs. After aging,cool to 26+/-2 degC and stir in a multimixer for 15 minutes and determine apparent viscosity, yield value and API fluid loss of the mud at 26+/-2 degC which should be as follows:
(a) Apparent viscosity, cp,max. : 1.5 times of 7A,ia
(b) Yield value, lbs/100ftsq.max : 1.5 times of 7A,ib
(c) API luid loss, ml, max. : 35% of 7A,ic
B. In salt water mud –
(i) Preparation of base mud:
Prepare a 105% (w/v) suspension of OIL approved bentonite in distilled water and stir the suspension for 15 minutes in multimixer so that no lumps are left after the stirring period. Age the suspension for 72 hrs at 90+/-2 degC. After the lapse of the aging period, cool and add 4% NaCl (w/v) (LR grade) and age for 24 hrs. at 26+/-2 degC. Dilute the suspension with 4% NaCl solution and adjust apparent viscosity in the range 15-20 cp. Adjust PH in the range 9.0 - 9.5 with 10% NaOH solution, if necessary. Determine apparent viscosity, yield value and API fluid loss of the suspension at 26+/-2 degC which should be as follows.
(a) Apparent viscosity, cp: 15 - 20
(b) Yield value, lbs/100 ftsq: To determine
(c) API fluid loss, ml: To determine
Treat the base mud prepared as per 7B(i) with 0.5% (w/v) of polyanionic cellulose (superlo grade) sample and stir for 30 minutes in a multimixer.
Performance at 26+/-2 degC
Determine apparent viscosity, yield value and API fluid loss of the treated mud 7B(ii) at 26+/-2 degC which should be as follows:
(a) Apparent viscosity, cp, min.: 2 times of 7B,ia
(b) Yield value, lbs/100ftsq, min: 1.5 times of 7B,ib
(c) API fluid loss, ml, max. : 15% of 7B, ic
8. Packing:
The material should be packed in multiwalled paper bags with at least two innermost layers suitably water proofed, strong enough to with stand rigours of transit and storage. Capacity 25 kgs net per bag.
9. Each bag should have clear legible marking as given below:
(i) Name of the product
(ii) Name of the supplier
(iii) Date/month/year of manufacture
(iv) Suply order number against which the supply is made.
N.B.: Apparent viscosity will be measure by a Fan VG meter and API fluid loss will be measured in standard API fluid loss apparatus using compressed air or nitrogen as pressure source
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