High differential pressures across permeable sands can cause severe problems during drilling operations. Some of the more severe and costly problems are stuck pipe, torque and drag and loss of whole mud. For nearly four (4) decades our team has supplied the oil & gas industry with Ven-Fyber 201™, a product designed specifically for problems related to highly permeable sands. For the last 30 years we have offered a low cost/high performance companion product called Delta-P™. It has been engineered primarily to control seepage loss in water base fluids.
However, it can be used in oil muds. Delta-P™ is a polysaccharide complex designed to reduce seepage loss in low pressure, depleted sands during drilling, workover and completion operations. Delta-P™ is a low cost alternative where continuous seepage control is required but usage conditions are relatively short term, hole temperatures are mild and low to moderate permeabilities exist. Where long-term exposure, high temperatures, and weighted systems (specifically oil muds) are required, Ven-Fyber 201™ should be considered.
Delta-P™ can be used as a seepage loss reducing additive either as a pretreatment at 2-8 lb/bbl or as a slug treatment. Slugs, pills, or sweeps can be prepared by mixing high concentrations (10-50 lb/bbl) of Delta-P™ in slugging tanks and sweeping holes on a regular basis.
Delta-P™ is recommended as a seepage loss additive in most types of water based drilling fluids. Delta-P™ can also be used as a seepage loss reducing additive in oil based and synthetic based mud systems. Pilot tests should be run to determine the effect on a specific oil mud system.
Delta-P™ is designed to seal low pressure, depleted sands and microfractured shales. It is not recommended where gross lost circulation occurs. It can be used advantageously in conjunction with more conventional LCM products. Delta-P™ is biodegradable and nontoxic. Where necessary, suitable biocides can be used to extentd the effective life of a seal.
Delta P PDS