It is designed to reduce the surface tension of all water-base mud systems and reduce the sticking tendency of water-sensitive shale cuttings.
DRILLING DETERGENT
General Purpose of Use, to use in drilling mud to prevent drilling with
clays
Specification:
1. Physical properties: The material, as received, should be soapy liquid, miscible with water. It should be free from visible impurities
and any other suspended matter.
2. Density at 25 DegC, gm/ml: 1.00 - 1.10,
3. Surface Tension of 0.25 %: 35.00(v/v) solution of the sample in distilled water at 25 Deg.C, dynes/cm., maximum.
4. PH of 1 % (v/v) solution: 7.5 - 10.5 of the sample in distilled water.
5. Emulsion Stability Test: To 485 ml of distilled water, add 15 ml of HSD oil slowly while stirring in a multimixer and then add to it 1 ml. of the sample. Stir further for 15 minutes in the multimixer for formation of emulsion. Transfer the contents to 500 ml. measuring cylinder and observe phase separation of the mixture which should be as follows:
(i) Immediate separation of HSD oil should be nil.
(ii) Separation of HSD oil after 24 hrs. at room temperature should not be more than 5 ml.
6. Mud Lubricity Coefficient: Prepare a 10-cp bentonite suspension by dilution of prehydrated bentonite suspension (OIL approved bentonite) and treat it with 0.5 %(v/v) of the sample and stir it for 15 minutes in a multimixer. Determine lubricity coefficient of the suspension in a lubricity tester. Lubricity co-efficient should not be more than 0.20
7. Foaming tendency test: Prepare 0.10% (v/v) solution of the sample in distilled water Stir the solution for 10 minutes in a multimixer. Transfer the content immediately to a measuring cylinder. Allow it to stand for 15 minutes and then measure the total volume of content along with foam. Calculate percent increase in volume due to foaming. Increase in volume should not be more than 5.00%
Advantages :
- Minimizes bit and BHA balling
- Reduces the surface tension of the liquid phase, helping to drop sand and remove drill solids
- Improves water-wetting action on all solids and reduces the sticking tendency of reactive shale cuttings
- Functions as an emulsifier, reducing the viscosity of oil-contaminated fluids
- Effective in all water-base mud
