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LOCK-VEB

Bridging/ sealing agent

It is an mixture of particles of organic origin with different sizes of grains. LOCK-VEB is designed to prevent fluid loss in fractured intervals by forming filter cake on the wellbore walls in permeable rocks. This additive creates an effective sealing of impermeable filter cake, or or a practically impervious plug, dependent on the mixing method and on the characteristics of permeable rocks.  Five types of LOCK-VEBadditives have been designed, different in the sizes of particles.

Main physicals properties

Appearance…………………………………yellow-and-brown powder

SG (monoproduct)………………………………………1,05-1,08 g/cm3

SG of the components………………………………0,7 - 1,15 g/cm3

Bulk density …………………………………………………………1,0 g/cm3

рН in water-based solution………………………………………………6-7

Solubility in water or in hydrocarbons…………..………insoluble

Particle size (d10-d50-d90)

LOCK-VEB Very Coarse – 8-12-15 mm

LOCK-VEB Coarse – 1-3-8 mm

LOCK-VEB Medium – 1-2-4 mm

LOCK-VEB Fine – 0,3-0,7-2 mm

LOCK-VEB Very Fine – 0,1-0,3-1 mm

Application

LOCK-VEB is a mixture of sealing materials to control fluid loss in the rocks characterized by different genesis.  Fine and very fine fractions may be used to reduce drilling fluid filtration in high-permeable rocks.  Fine and very fine particles are used to seal fractures and pores up to 3 mm in size, medium size particles are used to seal 5-6 mm fractures and pores, large size particles are used to seal fractures and pores up to 10 mm, and very big particles are used to seal 30-50 mm fractures and pores.

Fine and very fine particles may be pumped through the BHA and through the large and medium size bit nozzles. Large sizes shall be pumped through the open end of the drill pipe only.

Good wetability of the product. Fine and medium size particles may be added through the hopper, while larger particles may be transmitted directly to the agitator inside the tank, or through the discharge pipe/ sub of the pump.

Advantages

  • effective in combinations with bridging agents;
  • reduces infiltration processes;
  • environmentally friendly product;
  • may be used in the conditions with wide range of temperatures.

Limitations

  • may reduce the drilling fluid pH;
  •  moderate thixotropy is required, especially for the fluids with low SG;
  • high concentrations may cause plugging of suction lines, pumps and drill strings.

Toxicity and handling

  • Bioassay information is available upon request.
  • Handle as an industrial chemical, wearing protective equipment against dust, including safety goggles, and observing the precautions described in the Material Safety Data Sheet (MSDS).

LOCK-VEB is packaged in pallets in 25 kg plastic-lined sacks.

Store in a cool, dry place, in tightly sealed containers. Do not store or use near heat, sparks, or open flame. Avoid contact with incompatible products. Follow safe warehousing practices regarding palletizing, banding, shrink-wrapping and stacking.

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LOCK-VEB