WALL-GUARD Function Shale stabilizer and fluid loss control agent for low and high temperature drilling. General Description Wall-Guard is a proprietary blend of sulfonated asphalt compounded with sized minerals and other products known as shale stabilizers and fluid loss control enhancers. Readily dispersible in water based drilling fluids and is temperature stable up to 400°F.   Product Benefits Improves fluid loss in all water based drilling fluids. Temperature stable to 400° F (205° C) Bridges microfractures and permeable zones. Environmentally safe. Product Description Color: Dark brown powder Bulk Density: 41.3 lb/Ft3 (660 m3) pH in d.i. water @ 10 lb/bbl: 8.4 Packaging: 50 lb (22.7 kg) Multi-ply sack Typical Treatment: Wall-Guard may be used to pre-treat the whole circulating system at 4 to 5 lb/bbl (11.4 – 14.3 kg/m3) A pill containing 15 lb/bbl (43 kg/m3) Wall-Guard and 15 lb/bbl Blen-Fyber can be used in a sweep to reduce seepage loss, stabilize shale sections or seal low-pressure sands. This same formula can assist in the reduction of tortuosity in combination with the Maillet Spherical Bead Drilling Process. Recommended Uses: Unique seepage loss additive for water based drilling fluids. System treatment: 2 – 10 lb/bbl (5.7 – 28.5 kg/m3). Pill application: 10 – 25 lb/bbl (28.5 to 71.3 kg/m3) To reduce torque and drag and stuck pipe tendencies in low pressure sands. Excellent lubricating properties for logging and running casing. Minimizes differential sticking. Case History 1: The effect of Wall-Guard on a lab prepared, diluted seawater CLS Drilling Fluid. INTRODUCTION: The purpose of this test was to determine the effect of 4 lb/bbl of Wall-Guard on the rheology and fluid loss of a laboratory prepared, 12 lb/gal diluted seawater lignosulfonate mud. The mud was hot rolled, 16 hours at 150°F prior to test. DATA AND RESULTS: Table 1 shows that 4 lb/bbl Wall-Guard did not adversely affect the Plastic Viscosity, Yield Point or Gel Strength. The API fluid loss was reduced from 9.2 to 7.3 ml. At 275°F the HPHT fluid loss was decreased from 18.4 to 15.8 ml. The PPA test conducted at 2000 psi and 300°F with Fann 10-um ceramic discs showed a 0.6 ml reduction in spurt and an 8.6 ml reduction in total fluid loss. An identical test using OFI brand 2 Darcy discs show a 1.3 ml reduction in spurt over the Blank and a 4.4 ml reduction in the Total fluid loss. Competitive product fluid loss was consistently higher than with Wall-Guard. CONCLUSION: Wall-Guard does not adversely affect rheological or chemical properties of the drilling fluid. Wall-Guard at 4lb/bbl is effective in reducing the API and HPHT Fluid Loss. Wall-Guard also was effective in reducing the 300°F, PPA fluid loss at 2000 psi differential pressure based on identical test with Fann and OFI ceramic discs. Under the conditions of test Wall-Guard was more effective than competitive product in terms of reduction of the spurt loss and total fluid loss. RECOMMENDATIONS: In actual field applications, the fluid loss control properties of Wall-Guard may further improve with time, heat and high shear. If the water mud is oil contaminated compatibility can be significantly improved with the addition of up to 2 (vol)% Blen-Mul surfactant. Table 1 Untreated Blank Wall-Guard Competitive Product Additive, lb/bbl 0 4 4 Wt. lb/gal 12.0 12.0 12.0 Rheology -600 rpm 44 50 59 -300 rpm 26 29 34 -PV, cp 18 21 25 -YP, lb/100 sq.ft. 8 8 9 Gel Strengths, 10"/10"/30’ 2/5/8 2/6/8 3/10/14 Pf .5 .4 .3 Mf 1.4 1.5 1.3 PM .3 .3 .3 API Fluid Loss, ml 9.2 7.3 7.6 275°F HP-HT, ml 18.4 15.8 16.8 pH 9.8 9.7 9.7 Cl- , PPM 11500 11500 11500 Fann 10 um disc, Lot 38938, 300°F, PPA test @ 2000 psi -Spurt, ml 4.6 4.0 4.4 -Total, ml 46.8 38.0 38.4 OFI 2 Darcy disc, 300°F, PPA test @ 2000 psi -Spurt, ml 5.4 4.1 5.0 -Total, ml 34.0 29.6 30.8

info@boysenblue.com
Boysenblue/Celtec International, Inc.
P.O. Box 53648
Lafayette, LA 70505
1-800-624-2146
fax: (337) 233-6943