Fluid for plugging wells drilled with the opening of a productive layer in the depression, and the method of killing a well drilled with the opening of a productive layer in the depression (and its variants)
The invention relates to the field of well drilling and oil production, in particular, to a method of killing a well drilled with the opening of a productive layer in the depression, and can be used, for example, before conducting geophysical research before lowering the downhole equipment, etc., the Technical result - the complete preservation of reservoir properties of productive formation while killing the well, drilled with the opening of a productive layer in the depression, while increasing intensification of the flow of formation fluids during the development of such wells. The use of a by-product of the production of synthetic rubber at the stage of obtaining dimethyldioxanes as well kill fluid wells drilled with the opening of a productive layer in the depression. In the process of killing wells drilled with the opening of a productive layer in the depression, have pumped into the borehole fluid damping is a by - product of the production of synthetic rubber at the stage of obtaining dimethyldioxanes, to the extent that the filling of the wellbore above the roof of the productive interval of the formation to a height of not less than 100 m, and then produce a displacement fluid damping to vyravnivatelyami the displacement produced crude oil, which made the opening of the productive formation by drilling, and then raise the drill pipe to roof packs of kill fluid and produce fill the remaining wells of the same oil to natural static level. You can produce a displacement of the kill fluid to equalize its level in the pipe and annulus, with equal hydrostatic pressure in the well and reservoir pressure the displacement produce heavy oil with a density of more than 0.90 g/cm3after which raise the drill pipe to the upper limit of bundles kill fluid and produce fill the remaining wells of the same oil. You can produce a displacement of the kill fluid to equalize its level in the pipe and annulus, above reservoir pressure above the hydrostatic pressure in the borehole the displacement produce a bundle of invert emulsion to the extent that the filling of the wellbore above the liquid level killing not less than 50 m, and then raise the drill pipe to roof packs invert emulsion and produce fill the remaining wells with wash liquid of the estimated density. As invert EMU is th water,

Mineralized formation Water,

Emulsifier "Urinal 1" or its facilities at the Moscow-354 - 0,4
Smad-1 - 3,8-3,9
Bentonite - 0,5
and as a flushing fluid use produced water estimated density.Lagerware productive formation is at a height of not less than 100 m, provides guaranteed preventing fluid produce in the area of the reservoir even at different speeds, the injection of this fluid.Use as liquid produce in the first embodiment of crude oil, which made the opening of the reservoir, allows to achieve the level in the pipe and annulus without a strong push of a productive formation fluid damping, because crude oil is usually light or medium oil.The second option, use as liquid produce heavy oil with a density of more than 0.9 g/cm3allows you to create a soft effect produce to align the pipe and annulus level without a strong push of a productive formation fluid damping, the same effect is created and by the third variant by produce invert emulsion, which has a density 1,04-1,15 g/cm3but fill this invert emulsion also the wellbore to a height of not less than 50 metersDue to such varying types of liquid produce depending on the ratio of hydrostatic and pressure is ensured guaranteed exception zadavki the kill fluid in productive PLA is in all three variants to the upper limit of bundles kill fluid provides a reliable substitution of oil in the well kill fluid. The ascent of the kill fluid in the first and second embodiments is eliminated due to the higher density fluid damping in comparison with the density of the oil, fill the rest of the wellbore. In the third embodiment, the ascent of kill fluids are prevented by the use of invert (reverse) the emulsion of high viscosity to a state of "not flowing") and with high structural-mechanical characteristics of Q1/10=10/12.Filling the remaining volume of the well fluid produce provides for the establishment of equilibrium conditions between hydrostatic and formation pressures.In this application complied with the requirement of unity of invention as claimed kill fluid and all variants of the process of killing the well through the kill fluid constitute a single inventive concept and, together, they solve the same task, complete elimination of clogging of the productive formation and increase the stimulation of oil development wells.We offer you kill fluid was tested in the laboratory to establish its impact on the reduction of permeability of core samples. The research was carried out as follows.The formation of zones of sedimentation and prontohotel permeability was studied on samples of rocks bobrikovsky deposits Envisage field. Studied a range of problematic collectors with hard to recover reserves.The experimental procedure included the preparation of sample collections (selection, extraction, drying, saturation model produced water with a salinity of 234 g/l NaCl). Next, the method of semi-permeable membrane was created residual water saturation. Then were Considine hydrocarbon phase (kerosene) under vacuum. For each sample in terms of the approximate simulation of the occurrence of productive breeds was determined permeability to kerosene in the presence of residual water (CPRC 1, table). In all experiments was maintained the same consumption of kerosene, was strictly controlled by the effective pressure (7 MPa), the filtering and temperature.The next step was the simulation of the near-well zone, and on the borehole wall" - the output end of the composite model were breed with a maximum permeability (arr. 53947 table) and away from "well" permeability decreased. First was determined permeability model for kerosene, which in the first hour of its loading effective pressure of 7 MPa was 29 x 10-3μm2then one day exposure decreased to 19.2 x 10-3μm2. Pozravlenie investigated liquid damping was created differential pressure (Rscw-CL =0.5 MPa), which was supported by the day. "Development well" was carried out by filtering of the reservoir. When the differential pressure of 0.5 MPa in the first minutes of the filter does not exist, then quickly she began to grow. Half an hour later the rate of increase of permeability sharply decreased after 2 hours and 15 minutes permeability was compared with the original and then stabilized at about 20.2

drilling depth 1400 m;
the reservoir is verey horizon;
hydrostatic pressure above reservoir pressure;
static level when operating at a depth of 500 mUsing cementing unit CA-320M, well pump 1.4 m3the kill fluid T-92, filling this volume of the productive interval of the formation and the wellbore 100 m above the roof of this layer.Then, using crude oil density 0,86 g/cm3(light type of oil), which was used for the drilling of this well, punching kill fluid to establish equilibrium in the pipe and annulus. Further up the drill pipe to 1290 m - upper bound tutu fluid Glusha what I 500 m Then lowered into the borehole geophysical instruments for recording the Republic of Kazakhstan.For the second variant (with equal hydrostatic and pressure) technology implementation was similar to the above, except that, as the fluid produce used heavy oil with a density of more than 0.9 g/cm3.By the third variant (when formation pressure exceeds the hydrostatic) as liquid produce used invert (reverse) the emulsion, for example, the following composition, wt. %: diesel summer 18,1-26, 1; mineralized formation water (

Claims
Diesel summer - 18,1-26,1
Mineralized formation water,

Emulsifier "Urinal 1" or its facilities at the Moscow-354 - 0,4
Smad-1 - 3,8-3,9
Bentonite - 0,5
6. The method according to p. 4, characterized in that as the drilling fluid use produced water estimated density.
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