GEOSYNTHESIS ENGINEERING

Development and service of drilling fluid

Designed for deep drilling vertical, inclined and horizontal wells, the initial opening of productive seams in zones of abnormally high reservoir pressures.

A distinctive feature of the system BIOCAR-MT® is a high level of salinity, high temperature resistance and high density, which significantly expands the scope of a clay-free drilling fluids. This BIOCAR-MT® retains all the advantages of a clay-free biopolymer drilling fluids and provides a recovery rate of reservoir permeability, which significantly exceeds the corresponding figures for the traditional weighted solutions.

HISTORICAL REFERENCE

Successful application biopolimenyh clayless systems for drilling directional and horizontal wells, drilling-with ALFP indicate high prospects for their further improvement. Meanwhile scope clayless systems limited low heat resistance polysaccharide reagents underlying polymer preparation thixotropic structure. The geological conditions of Ukraine within the temperature stability of the biopolymer systems at 110-120oC exclude the possibility of their use in the fields of DDI to a depth of 3500-4000 m in most of the deposits of the Carpathians and the Crimean peninsula.

Application of heavy mud on mud or clay-based polymer due to the difficulties caused by the growth of the structural, mechanical and rheological properties, especially at high temperatures. This leads to excessive dynamic loads on permeable formations in restoring circulation and open source software reduces the upper limit of the weighting of the solution, makes it difficult to GIS leads to a waste of reagents and environmental pollution.

In conditions of increased repression of the negative impact of the solid mud reservoir properties is enhanced. Exclusion of clay would eliminate the problem of thickening weighted solutions and improve the quality of drilling into productive formations. Saturation of the dispersion medium will improve the salts inhibiting characteristics of the fluid and reduce the need for density. These provisions are implemented to create washing systems BIOCAR-MT®.

ADVANTAGES

  • BIOCAR-MT® system retains all the benefits that provides the use of a clay-free drilling fluids, in particular - the solution BIOCAR®:
  • The lack of clay components in solution to reduce the irreversible colmatation unsealed reservoirs weighted exclude gelling temperature of the solution reduces the dynamic effects on the borehole wall.
  • The exclusive use of biodegradable components eliminates the problem of reducing the permeability of the collectors due to the adsorption of polymers on the surface of the pores.
  • The rheological properties of the solution provide effective cleaning of the face and stem cuttings to the surface, and do not create additional resistance when flushing.
  • The components of the solution are resistant to mono- and polyvalent salts do not form insoluble compounds upon contact with the rock and reservoir fluids.

ADDITIONAL ADVANTAGES OF THE SYSTEM BIOCAR-MT®

  • Inhibitory properties of BIOCAR-MT® higher than the traditional solution and BIOCAR® hlorkalievogo mud.
  • High salinity BIOCAR-MT® allows to exclude from the reagents, bactericides, which reduces the toxicity of the fourth class of danger, and can be used under the most stringent environmental requirements.
  • Thermal stability of BIOCAR-MT® higher than alternative solutions on the basis of the polysaccharide that allows you to use it when drilling at great depths.

RESTRICTIONS

  • The effectiveness of the system BIOCAR-MT® as a clay-free drilling fluid is reduced when it is contaminated mud cuttings.
  • Therefore recommended to use purification step 3-4 mud recovery system comprising a weighting agent.
  • Thermal stability of BIOCAR-MT® is at 140°C.
  • Increasing the pH of the solution more than 11 causes destruction of biopolymers. The solution is not recommended for use in cement razburke large glasses.
  • The density of the solution is in the range 1200-1600 kg / m3.

COMPOSITION AND OPTIONS WASHING SYSTEM

THE COMPOSITION OF THE MUD

  • BIOCAR-compound - 5-6% (integrated reagent provides filtration and rheological properties of the solution);
  • potassium chloride - 3-7%;
  • sodium chloride - up to saturation;
  • Alevron® - 0,5-1% (HPHT filtration control and rheology);
  • carbonate filler - 10-15%;
  • K-200 - 1-1.5% (organic filler);
  • Graphite - up to 1% (before running casing);
  • carbonate or barite weighting - depending on the desired density;
  • lubricating additives, pH regulator, antifoaming agents, surfactants.

PARAMETERS OF THE MUD

  • Density - 1200-1800 kg / m3,
  • Funnel viscosity - 60-120 sec.,
  • Gel - 30 / 40-40 / 50 dPA
  • fluid loss - 4-5 cm 3/30 min.,
  • downhole fluid loss at a temperature of 140 ° C and a pressure drop 5MPa - 15-20 cm3 / 30min .;
  • PV - 30-50 mPa.s;
  • YP - 140-200 dPa;
  • pH - 9.5-10.5.