Liquid for killing wells

 

(57) Abstract:

The invention relates to oil and gas production, in particular the killing of wells for current and capital repairs. The technical result - the full preservation of the original permeability of the productive formation. Liquid for killing wells includes technical lignosulfonates and fresh or salt water, additionally contains a nonionic surfactant in the following ratio of ingredients,% vol.: technical lignosulfonates 5-25, nonionic surfactants of 0.2-0.5, fresh or salt water - the rest.

The invention relates to oil and gas production, in particular the killing of wells for current and capital repairs.

Known liquid for killing wells (RF patent 2044753) containing monoolefinic liquor (waste of pulp and paper production) 80-94%, mass and salt one or divalent metals hydrochloric acid (6-20%). However, in the presence of formation water this fluid coagulates and clogs the pores of the reservoir, which leads to lower productivity wells after the cattle (major repair of wells).

Closest to the present invention is a liquid for killing SCE hydrochloric acid 20-24% concentration, 3-4% vol., salt water - the rest. However, this fluid also coagulates from the effects of produced water, and hydrochloric acid reacts with carbonate rocks of the productive formation with sediment, which leads to lower permeability and initial production of the well.

The purpose of the invention is the complete preservation of the original permeability of the productive formation after killing the well.

This objective is achieved in that the liquid for killing wells, including technical lignosulfonates and fresh or salt water, additionally contains a nonionic surfactant (surfactant) in the following ratio of ingredients,%:

Technical lignosulfonates - 5 - 25

Nonionic surfactants - 0,2 - 0,5

Fresh or salt water - the Rest

The proposed liquid may be used in the form of a 5% concentration with g=1,02 g/cm3; 10% concentration with g=1.04 g/cm3; 25% concentration with g=1.10 g/cm3; 50% concentration with g=1,21 g/cm3; 60% concentration with g= 1,245 g/cm3; this maintains a capacitive reservoir properties (permeability rocks enables you to retain the performance of the reservoir after the cattle. the first fluid by adsorption on the particles of technical lignosulphonate (PRS) and thereby prevent coagulation, clogging the low permeability of the reservoir. When possible inversion (formation of inverted micellar emulsion), the latter has a relationship to in-place hydrocarbons and therefore the permeability is maintained. The volume of kill fluid is at the rate of up to 10 m3/day. 4 m3; up to 20 m3/day. 5 m3; up to 40 m3/day. - 6 m3; up to 60 m3/day. 8 m3; >60 m3/day. - 10 m3.

From the analysis of scientific-technical and patent literature, the use of the inventive liquid for killing wells is not known, so the proposed solution meets the criterion of "Novelty". In addition, the inventive liquid meets the criterion of "Industrial applicability" as easy to cook both in the field and stationary conditions.

The inventive liquid for killing wells was tested for specific wells.

Example. When killing the well mineralized water flow rates it decreased by 30% and only recovered after 4 months. When using the inventive liquid for killing wells and conducting workover the well production rate is not changed.

The proposed liquid for killing wells were prepared by dissolving in hot production for THE 54-028-0027-9580-97 and nonionic surfactants (OP-10) according to GOST 8433-81 in the tanks of cementing unit.

Liquid for killing the well, including langoulant technical and fresh or salt water, characterized in that it additionally contains a nonionic surfactant in the following ratio of ingredients, about. %:

Langoulant technical - 5-25

Nonionic surfactants - 0,2-0,5

Fresh or salt water - the Rest

 

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How well killing // 2212527
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The invention relates to the extraction of oil and is designed to regulate the flow of oil during operation of the well, and to transmit information about the parameters and the state of the well

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The invention relates to the extraction of oil, gas and gas condensate

FIELD: mining industry.

SUBSTANCE: invention can be used in case of gas-lift operation of wells equipped by free piston-type installations. Invention envisages stopping well, connecting tube space and annular space in wellhead, recording bottom zone and wellhead pressures in tube and annular spaces, and computing well operation parameters using inflow curve plotted according to differences of bottom zone and wellhead pressures. Volume of produced fluid is found from potential output of formation and from condition of output of free piston. When comparing these volumes, parameters of well are computed in the base of minimum volume value.

EFFECT: optimized well operation.

2 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: foam-forming compound for shutting wells contains hydrocarbon liquid, mixture of surfactants, one of components thereof is water solution of lignosulphonate reagent of 25% concentration, herbal filling agent and 20% water solution of calcium chloride, as lignosulphonate agent reagent it contains powder-like technical lignosulphonate, and as other component of surfactant mixture - hexamethylentetramine, and as herbal filling agent - peat or grass flour with following ratio of components in percents of mass: hydrocarbon liquid 12-14, said water solution of technical powder-like lignosulphonate 17-21, hexamethylentetramine 0.17-0.63, peat or grass flour 3-6, said calcium chloride solution - the rest, while relation of mass portions between said water solution of technical powder-like lignosulphonate and hexamethylentetramine is 1: 0.01-0.03 respectively, as grass flour it contains pulverized herbal waste of grain bread production or similar substance.

EFFECT: higher efficiency.

2 cl, 18 ex, 1 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: compound includes water and inhibiting salt, as inhibiting salt contains processed electrolyte - side product during production of magnesium via electrolysis from carnallite, and additionally as reducer of filtering and thickener - carbooximethylcellulose polymer, and as colmatation agent - magnesium oxide with following relation of components in percents of mass: processed electrolyte - side product of magnesium production via electrolysis from carnallite 10.0-15.0, carbooximethylcellulose 2.5-3.0; magnesium oxide 1.0-2.0, water 80.0-86.5.

EFFECT: higher efficiency.

3 tbl

FIELD: oil and gas producing industry, in particular composition for killing of well.

SUBSTANCE: claimed polysaccharide gel contains sweet or mineralized water, polysaccharide gelling agent, boron cross-linking agent, diethanolamine, quaternary ammonium compounds, and mixture of non-ionic and anionic surfactant (complex surfactant). Mixture of water soluble oxyethilated alkylphenols and their sulphoethoxylates in form of sodium salts or salts with triethanolamine is used as complex surfactant in amount of 0.1-0.5 kg on 1000 l of water being the gel base. Polysaccharide gel is obtained by dissolution and hydration of polysaccharide gelling agent in sweet or mineralized water (preferably monovalent ion solution) followed by treatment of obtained polysaccharide solution with aqueous solution including boron cross-linking agent, diethanolamine, quaternary ammonium compounds, and complex surfactant.

EFFECT: well killing composition of improved quality.

2 cl, 6 ex, 1 tbl

FIELD: oil extractive industry.

SUBSTANCE: method includes mounting compressor pump in such a way, that input aperture of tail piece was positioned below bed sole. Prior to that water cone in face-adjacent zone is destroyed by draining water through tail piece, connected to lower suck-in valve of compressor pump cylinder, and along behind-pipe space through side suck-in valve of compressor pump cylinder. In case of increase of hydrocarbon contained in drained liquid beginning of water cone destruction is assumed. Draining is continued until destruction of emulsion in water cone, formed in non-homogenous porous environment of bed at limits of hydrocarbon-water and water-hydrocarbon, separation of water and hydrocarbon streams and bringing current water-hydrocarbon contact to initial position. Then during extraction water is drained through tail piece, and hydrocarbon - along behind-pipe space.

EFFECT: higher yield.

3 cl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes preparation of technological liquid - water solution of sylvinite ore mixture with chlorine calcium by solving a mixture of components in hot fresh technical water, drained from oil and water preparation plants or bed water. During solution of sylvinite ore mixture with chlorine calcium in bed water the latter is drained from the well at temperature 60-90°C. Technological liquid is produced with solution density 1.23-1.37 t/m3. Then prepared technological liquid is fed into well shaft a bit lower, oppositely to zone and above ceiling of productive bed with forming of hydraulic column above the latter. Then well shaft to the mouth is filled with water. Value of technological liquid hydraulic column of high density on basis of said mixture, fed into well shaft above ceiling of productive column of technological liquid is taken in amount, necessary and enough from well stopping conditions.

EFFECT: higher efficiency.

6 cl, 1 ex

FIELD: oil and gas production.

SUBSTANCE: water-based composition that can be used for killing of well during pullout of hole and well remedial work as well as for temporary abandonment of well contains, wt %: carboxymethylcellulose3.5-4.5, sodium hydroxide1.5-2.0, copper sulfate 0.3-0.4, and methanol 4.0-16.0.

EFFECT: improved rheological properties of composition and increased lifetime of formed gels.

1 tbl

FIELD: oil and gas industry.

SUBSTANCE: method includes serial pumping into well of buffer, blocking and pressing liquid, blocking liquid contains hydrocarbon base, acyclic acid, caustic soda and mineral filler with following relation of components in percents of mass: hydrocarbon base 41-72, acyclic acid 6.1-14.4, caustic soda 4.9-13.0, mineral filler the rest. Hydrocarbon base of blocking liquid is oil or oil processing products. As mineral filler blocking liquid has calcium carbonate with diameter of particles no less than 2 micrometers.

EFFECT: higher efficiency, simplified maintenance, simplified construction.

3 cl, 1 ex

FIELD: oil industry.

SUBSTANCE: at least one acoustic dynamic is mounted immediately on product pipe in oil well and acoustic characteristic of flowing environment flow is determined in product pipe. It is sent into surface controller, using product pipe. Using surface controller flowing substance flowing mode is determined, on basis of which working parameters of oil well are adjusted. Working parameters of oil well can be adjusted to detect Taylor mode of flow. For adjustment of working parameters throttle is used and/or controlled valve of oil well, controlling amount of gas, forces into product pipe. For determining mode of flow of flowing environment artificial neuron net can be used. It is possible is provide energy for acoustic sensor through product pipe. It is possible to determine additional physical characteristics of flowing substance, for example pressure and temperature.

EFFECT: higher efficiency.

3 cl, 22 dwg

FIELD: mining industry.

SUBSTANCE: system has first induction throttle, second induction throttle and controlled switch. Second induction throttle is positioned near second branch of pipeline structure. Controlled switch has two outputs. First switch output is electrically connected to pipeline structure on the side of induction throttles connection, where first and second branches of pipeline structure intersect. Second output of switch is electrically connected to pipeline structure on other side of at least one induction throttle. Pipeline structure can be positioned inside oil well, and can have casing string and operation tubing column. Also described is method for extracting oil products from oil well using said system.

EFFECT: higher efficiency.

4 cl, 10 dwg

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