Nagakura liquid

 

(57) Abstract:

The invention relates to the oil and gas industry and can be used in the operation of oil and gas wells. The technical result is to ensure reliability and safety sealing element of the packer in a long time. Nagakura liquid hydrocarbon-based, containing diesel fuel, bitumen and heavy component that contains as a weighting component colloidal sulfur, and optionally the oil, lime, sulfinol and water in the following ratio, wt. %: diesel 17,0-19,0, oil 11,0-13,0, bitumen 5,0-7,0, quicklime 13,0-15,0, sulfinol 0.3 to 0.5, colloidal sulfur 45,0-50,0, water of 2.0 to 3.0. Nagakura liquid contains colloidal sulfur particle size of 10-5and 10-7μm and a density of 2070 kg/m3. Nadakarni liquid is prepared at a temperature of 90-100oC. for 2 h.p. f-crystals.

The invention relates to the oil and gas industry and can be used in the operation of oil and gas wells.

In the operation of oil and gas wells, if the composition of the produced fluids are highly toxic components of H2S and CO2, pipe separates the space from the annulus into the production string, that is, ensures that the contact of corrosive components with the inner surface of the production string. For this purpose, tubing down the packer device, the sealing element after which a pressure opens and closes the annulus. The sealing element provides a seal when the pressure differential 20,0-25,0 MPa. In this case, it is important nagakura fluid injected into the annulus and create hydrostatic pressure on the packer.

Known nadakarni liquid - J. R. Gray, G. S., Darley. The composition and properties of drilling agents (drilling fluids). - M.: Nedra, 1985, S. 73-75. Such fluids are saline solutions : sodium chloride - density solution 1200 kg/m3the sodium chloride and calcium - density solution of 1400 kg/m3the calcium chloride - density solution 1410 kg/m3chloride and bromide calcium - density solution 1800 kg/m3. Pumping nadakarni fluid in the annulus, reduce or remove the resulting pressure differential.

However, these solutions have significant drawbacks:

the solution of calcium bromide expensive;

- other solutions Sol the above solutions at high temperature 100oAnd above do not remove the corrosion process;

- penetration of solution into the reservoir occurs deterioration of reservoir properties and the falling flow of the production fluid.

The closest analogue is nagakura liquid hydrocarbon-based, containing diesel fuel, fuel oil, bitumen, lime, sulfinol, water, but it has a density of 1000 kg/m3that is not enough for the conditions AGCM. To increase the density of the hydrocarbon liquid used heavier materials : barite, BaSO4, magnetite Fe2ABOUT3- J. R. Gray, G. S., Darley. The composition and properties of drilling agents (drilling fluids). - M.: Nedra, 1985, S. 77-78, 443.

These weights, having a high density of 4200 kg/m3and 5000 kg/m3and accordingly the size of the particles, after 1-2 months begin to precipitate, which leads not only to relieve back pressure on the packer, and sticking tubing besieged by weighting.

Object of the present invention is to provide nadakarni fluid ensuring the reliability and safety of the sealing element of the packer for a long time.

This task is solved in that nagakura the liquid weight of the component colloidal sulfur and additionally oil, lime, sulfinol and water in the following ratio, wt.%:

Diesel fuel - 17,0-19,0

Oil - 11,0-13,0

Bitumen - 5,0-7,0

Quicklime - 13,0-15,0

Sultanol - 0,3-0,5

Colloidal sulfur - 45,0-50,0

Water - 2,0-3,0

Nagakura liquid contains colloidal sulfur particle size of 10-5and 10-7μm and a density of 2070 kg/m3.

Nadakarni liquid is prepared at a temperature of 90-100oC. Laboratory studies nadakarni fluid density 1500 kg/m3showed that the liquid is stable, the deposition of heavier material does not occur.

From colloidal chemistry is well known that the process of deposition of colloidal particles depends on the composition, density, particle size and viscosity of the solution

< / BR>
where V is the velocity of deposition of colloidal particles, cm/s;

r is the particle diameter, mm;

dnthe density of the particle, g/cm3;

dp - liquid density, g/cm3;

- viscosity nadakarni fluid, SDR

Particle colloidal sulfur has a size of 10-5and 10-7μm and a density of 2070 kg/m3and it is markedly different from the particles of Fe2ABOUT3or SO4the size and density of which is much higher. Speed OSI fluid, weighted up to 1500 kg/m3and a viscosity of 200-300 SP, according to the formula above, almost no deposition occurs, that is, solves the problem of maintaining hydrostatic pressure in time.

Example

Offer nagakura liquid consisting of diesel fuel versus 18.3 %, fuel oil - 12.7 per cent, of bitumen - 6%, quicklime - 14%, sulfinol 0.4%, and water is 2.3% and the weighted component colloidal sulfur - 46,3%, was tested in laboratory conditions Uniphase at a temperature of 90-100oC. After the 2-month monitoring fluid properties have not changed.

Thus, the proposed nagakura liquid, keeping their physico-chemical properties, ensures the reliability and safety of the sealing element of the packer for a long time.

1. Nagakura liquid hydrocarbon-based, containing diesel fuel, bitumen and heavy component, characterized in that it contains as a weighting component colloidal sulfur, and optionally the oil, lime, sulfinol and water in the following ratio, wt. %:

Diesel fuel - 17,0 - 19,0

Oil - 11,0 - 13,0

Bitumen - 5,0 - 7,0

Quicklime - 13,0 - 15,0

Sultanol - 0,3 - 0,5

Kohler with a particle size of 10-5and 10-7μm and a density of 2070 kg/m3.

3. Fluid under item 1, characterized in that it is prepared at a temperature of 90-100oC.

 

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