Liquid for killing wells

 

The invention relates to the field of oil and gas, in particular compositions for killing the well, and can be used at the enterprises of the oil and gas industry underground and well workover. The technical result is the preservation of the original permeability of the reservoir and increasing the frost resistance of fluid damping. Fluid for plugging wells comprising an aqueous solution of glycerin and potassium chloride, further comprises alfacell, disolve and aluminosilicate microspheres AFM in the following ratio, wt. %: glycerin 50,0-60,0, alfacell 1,5-2,0, potassium chloride 2,0, disolve 0,5, AFM 5,0-15,0, water the rest. table 2.

The invention relates to the field of oil and gas, in particular compositions for killing the well, and can be used at the enterprises of the oil and gas industry underground and well workover.

Known liquid for killing wells (RF Patent 2136717, From 09 To 7/06) containing, wt.%: gas condensate 81,0-84,9, synthetic fatty acid FFA 1.7 to 2.3, caustic soda (NaOH) 0,6-1, bentonite else.

The disadvantage of the kill fluid is one which tax is liquid for killing the well, comprising, by weight. % of: calcium chloride 1-40, an organic solvent, including glycerin 10-50, inhibiting salt including potassium chloride 1-10, water the rest (RF patent 2115686, E 21 In 43/12, 20.07.1998).

The disadvantage of this fluid damping is that it does not have sufficient resistance to frost and does not retain the initial permeability of the formation after killing the well.

The objective of the invention is to develop a process liquid for damping oil, gas and gas condensate wells with reservoir pressure equal to or below hydrostatic, with increased frost resistance and the ability of full preservation of reservoir properties production facilities.

Technical result achieved is to create a mud oil, gas and gas condensate wells with properties that retains the initial permeability of the formation and providing fluid increased frost resistance.

The invention consists in that the fluid for plugging wells comprising an aqueous solution of glycerin and potassium chloride, further comprises alfacell, disolve and aluminosilicate microspheres AFM in the following ratio, wt.%: Glycerol - 50 is the first and the patent literature the use of the inventive combination of an aqueous solution of technical glycerol and alfacell with the addition of aluminosilicate microspheres in the composition of the liquid for killing wells in their proposed quantitative ratio is not known.

In the present invention the inventive composition of ingredients of the liquid plugging in this value allows to obtain a solution with optimal process parameters. The mutual influence of the components on each other contributes to the hydrophobization of the surface of the collector, reducing the capillary pressure in the pores of the reservoir, allowing, on the one hand, to exclude filtering the mixture into the reservoir and to maintain the original permeability of the formation, and on the other hand, to reduce the freezing temperature of the proposed mixture as a liquid for killing wells.

These properties offer mud wells when used in field conditions allow year-round to perform a reliable killing of wells when they are underground and repair.

Glycerin (triethylene glycol) triatomic alcohol, is a colorless, thick, syrupy liquid with sweet taste, heavier than water (y= 1260 kg/m3) at a temperature of 15oC. Has a low surface tension. Easily soluble in water and alcohol, mixing with them in any proportion (GOST 6824-96). Has no toxic and irritating. Environmentally friendly. Molecular formula of glycerol CH2About the "Orgsintez"
4 the Perm chemical plant
Alfacell - soluble hydroxyethylcellulose (SCE) TU-6-5 5-221-1407-95, the product is white or yellowish-white color, easily soluble in water. Used for thickening solution, to create a structure capable of holding in suspension the composition (the stability of the system within 10 days), and lower filtering.

in Vladimir, CJSC "Police").

Potassium chloride (KCl), GOST 4568-83 - white crystalline powder, hygroscopic, in aqueous solution dissociated completely, an inhibitor of hydration and dispersion of clays.

Disolve 4490 - surfactant is used to remove chemicals from the bottom zone.

Hollow silica-alumina microspheres (AFM) TU-21-22-31-91 from aqueous slurry of coal ash with the addition of an extender component hydrocarbonate with semi-aquatic plaster. The density of the microspheres is 400 kg/m3. Used as a regulator fluid density plugging and plugging. Is, in Yekaterinburg, JSC "Bentonite of the Urals."

For experimental verification of kill fluids were prepared with four composition (table. 1).

Technology solution the following.

Fresh water is introduced rasteenie 10 minutes Then in a water-glycerin mixture is injected estimated number of reducer filter alfacell. The polymer is introduced in dry form with continuous stirring until complete dissolution. With further stirring, the solution is introduced, the calculated quantity of potassium chloride and a surfactant. After a homogeneous system at the final stage are added aluminosilicate microspheres and stirring continued for a further 30 minutes

Measurement of main technological parameters of the fluid damping is produced on standard devices.

Best options in part 3 (of the table. 1).

These tables show that the proposed liquid for killing wells, compared with the liquid on the prototype, fully preserves the initial permeability of the formation after killing (restitution coefficient of permeability 100%), has a higher degree of frost resistance (the freezing temperature of minus 15 to minus 38,9oC), while the liquid of the prototype freezes at temperatures from minus 20 to minus 23o(Restitution coefficient of permeability to 95.7%).

These properties offer mud wells will allow you to use it on the Urengoy and Yamburg MESTOROZhDENIYa, the proposed liquid can be used as a blocking frost system for damping gas (condensate) wells with abnormally low (abnormally low formation pressure).


Claims

Fluid for plugging wells comprising an aqueous solution of glycerin and potassium chloride, characterized in that it further comprises alfacell, disolve and aluminosilicate microspheres AFM in the following ratio, wt.%:
Glycerin - 50,0-60,0
Alfacell - 1,5-2,0
Potassium chloride - 2,0
Disolve - 0,5
AFM - 5,0-15,0
Water - The Rest

 

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FIELD: oil and gas production.

SUBSTANCE: composition 61.0-68.9% petroleum or petroleum processing product, 2.0-4.7% natural fatty acid, 2.1-4.0% sodium hydroxide, and natural calcium carbonate with particle size 2 to 50 μm - the rest. Natural fatty acid employs vegetable and animal fat production waste.

EFFECT: enabled killing of well at temperatures up to 80°C with middle and low-permeable reservoirs using inexpensive and accessible domestically available materials allowing oil reservoir properties of producing formations to be preserved.

3 cl, 2 tbl, 2 ex

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