Procedure for hole casing and heat insulation

FIELD: gas and oil production.

SUBSTANCE: ecologically pure not hardening pill is used for tamping annular space of casing string. Spherical cavities uniformly distributed by volume are arranged in the pill. Also, mechanical matrixes are tempered in a not yet hardened pill. Matrixes consist of an internal part with closed porosity and an external part with open porosity at ratio of corresponding volumes of parts within range from 90:10 to 99:1. Application of non-hardening pill instead of not freezing one prevents drinkable water bearing horizons from hydrocarbon impurities.

EFFECT: application of matrix of cheap foam glass in non-hardening pill instead of use of expensive refrigerating installations, thermostats and double casings in surface equipment and in structure of direction and conductor of hole.

3 cl

 

The invention relates to the oil and gas industry, namely, fixing and insulating wells in griffoniana section, including oil and gas wells and steam, including permafrost (MMP).

The method is designed for fixing and insulating annular casing (SPOC) at intervals of rocks, where there are alternating in the direction of massoperenosa substances SPOCK, including at the inter-phase transformations, for example, when strong heating or freeze-thawing, including for fastening steam wells in MMP. A feature of this invention is the presence in noterdaeme the bridging spherical voids uniformly distributed throughout its depth, void, seeking the same size regardless of the hydrostatic pressure, voids that can be compressed and decompressed.

Known neurorubine potverdilsya cement compositions, for example, containing bentonite and water (U.S. Pat. 2234592 RF, MPK7E21B 33/138, publ. 20.08.2004, bull. No. 23).

Their disadvantage is that they do not contain voids, which can be not only insulation, but also the joints of massoperenosu condensed matter SPOK with phase-to phase transformations, including a strong heating of the NII by evaporation or freeze-thawing with the formation of "ice bombs", deforming the casing string.

And voids in the process of existence should automatically seek to the spherical shape due to surface tension)that was not formed fracture appropriate swab and possible griffins.

Known lightweight cement slurries of low-density known to facilitate fillers [Bulls IU Thermal protection structures wells in frozen sediments [Text]: textbook. manual / Youryou, Twibble. - Ukhta: Ural state technical University, 2007. - 131 S.: ill., p.105], such as expanded perlite, expanded vermiculite, expanded clay and others. These fillers are porous spheres, which can break down under high pressure in the well, i.e. can compensate for the resulting surplus of condensed matter in thermal and phase-to phase transformations. However, they are used for the formation of voids in hardened solutions, and these voids in the resulting stone or may not serve as an expansion joint formed of excess condensed matter in thermal and phase-to phase transformations, or when this happens cracking stone tampon, it depressurization and even probable destruction of the casing columns. Moreover, the potential destruction of expanded fillers should be considered a fault and, at present, drilling Shi is acoe application received durable and expensive glass microspheres, not intended to be deformed.

Known from the classification of drilling fluids [Sereda N.G. Drilling oil and gas wells [Text]: Textbook for universities. - 2nd ed., revised and enlarged supplementary/ N. Sereda, E.M. Soloviev. - M.: Nedra, 1988. - 360 S.: ill., str.] clay suspension (based on bentonite and water) with the polymer and other additives, gas-liquid mixture, and clearly following the classification, aerated clay suspension. If they apply for bridging SPOCK, they are deformed, can be compensated and the resulting surplus, and the resulting deficiencies in the volume of condensed matter SPOCK.

However, the size and uniformity of distribution of voids in aerated clay suspension obey an exponential dependence on hydrostatic pressure, which does not provide uniform insulation and compensation massoperenosu substances SPOCK at thermal extension-compression and phase-to phase transformations. Moreover, due to the presence of a geothermal gradient inverse freezing occurs from the top down, and below the respective holes of the greater hydrostatic pressure of the smallest in size, that is the least technologically advanced as by the ability to compensate for the resulting excess volume and capacity of the insulation.

Uniformly distributed over the volume of the voids can be is to teach by a special entry in noterdaeme cement composition closed porous spherical matrices, like the above expanded spheres, sinusas in the formation of excess amounts of the liner. However, their disadvantage is an advantage.

Known ice-free swab for low-temperature wells [U.S. Pat. 2167268 Russian Federation, IPC7E21B 33/138, publ. 20.05.2001, bull. No. 14], containing a hydrocarbon liquid and exfoliated vermiculite sand, which can be used for another purpose - to compensate thrashing pressures arising from reverse freezing slurry mass. However, ice-free tampons with hydrocarbon fluids contaminate underground drinking water. In addition, it is not designed to compensate for the reduction of the amount of condensed substances SPOCK, which can cause cracking and leaking pasty swab.

The task of the invention:

1. Clean noterdaeme cement composition.

2. The creation of a uniform height of insulation.

3. Compensation massoperenosu, including at the inter-phase transformations.

The assigned problems are solved in the following way: well attach using eco-friendly noterdaeme swab, which arrange evenly distributed over the volume of the spherical cavity.

Uniformly distributed over the volume of the spherical strips and arrange by means of mixing noterdaeme swab mechanical matrices, which displace him in his volume of voids and serve them with frames that are somewhat crumpled; the compression volume of the tampon and provide uniform expansion of cavities in the expansion of the tampon.

These matrices consist of two parts. The first part is an internal, closed porosity, for compensation arising excess amounts of condensed matter. It can withstand hydrostatic pressure, but crushed in the formation of excess volume of the support, which does not damage the casing, at least when multiple compression cycles (freezing). The second part is external, with open porosity, gas for compensation of volume reduction of condensed matter SPOCK. In this porosity, the gas bubbles will be saved and after entering matrices in the cement composition. Therefore, when reducing the volume of the condensed phase supports these bubbles will serve as centers of gas and steam, and accordingly to increase in size. As a result of additional voids will be formed around the matrix, in the form of growing areas, and not cracks. Accordingly, the tampon will remain impenetrable.

Example

In the interval MMP need to fix the conductor and to prevent the occurrence of griffins, karst lakes around the wellhead and to prevent the collapse of casing at about atom freezing. For this purpose apply noterdaeme cement composition with mechanical matrices, for example, of foamed glass, from the condition that the maximum depth of injection of the composition and the crushing strength closed porous spherical matrices are related by the formula

σ=PGS=ρgh,

where σ is the strength of the crushing balls of foam glass;

PGS- hydrostatic pressure in the annulus of the well.

ρ is the density of the cement composition;

g - free fall acceleration;

h is the maximum depth of the injection composition.

If MMP thickness of 160 m and the normal reservoir pressure, it is permissible to use cement composition density 1000 kg/m3where closed porous spherical matrix is made in the form of balls of foam glass with crushing strength of 1.6 MPa, which certificate are outside the open porosity of 2%, allowing the cement composition to compensate for the expansion-compression.

The chemical composition noterdaeme tampon pick in the laboratory wash drilling and grouting fluids, depending on the specific conditions of construction and operation of the well.

1. The method of mounting holes and insulate the hole in the rock intervals, where there are alternating in the direction of massoperenosa substances annular casing number is NN, characterized in that for plugging the annulus of the casing using environmentally friendly not harden swab, which arrange evenly distributed over the volume of the spherical cavity, compensating compression and expansion of the substance annular spaces of casing strings.

2. The method according to claim 1, characterized in that suit uniformly distributed over the volume of the spherical cavity by mixing not harden swab mechanical matrices which displace him in his volume of voids and serve them with frames that are somewhat crumpled; the compression volume of the tampon and provide uniform expansion of cavities in the expansion of the tampon.

3. The method of claim 2, wherein the mechanical matrix consist of an inner part with a closed porosity and an outer part with an open porosity in the ratio of the respective volumes of parts in the range from 90:10 to 99:1.



 

Same patents:

FIELD: gas and oil production.

SUBSTANCE: procedure consists in lowering string into well into zone of water inflowing pay, in pumping backfilling solution prepared of bitumen with filler through string into well and in forcing string through into water inflowing pay. Also, as filler there is used cement and additionally high viscous bitumen at amount of 5-20 wt % or high viscous oil of volume of bitumen-cement solution determined depending on a geologic-physical characteristic of the pay. Before pumping into the well and depending on occurrence depth of the water inflowing pay backfilling solution is heated to temperature as high, as 70-80°C. Solution is pumped through the string of heat insulated pipes under the mode of alternating pressure at maximal pressure not exceeding pressure of hydraulic outbreak above the located pay. Also, after water insulating operations production of the pay is withdrawn in a cyclic mode with start up into operation for 2-3 days and shut down for the same time as many as three times, if intake capacity of the pay exceeds 500 m3/day.

EFFECT: improvement of procedure.

5 cl, 1 dwg

FIELD: oil and gas production.

SUBSTANCE: procedure for restraint of water production in well consists in pumping solution of CL (cultural liquid) into insulated interval. Two equal portions are pumped. The first portion corresponds to solution of CL prepared on soft water of 1000 kg/m3 density at ratio 1:0.5-1, while the second one corresponds to solution prepared on reservoir mineralised water of density up to 1190 kg/m3 at ratio 1:0.3-0.5.

EFFECT: raised efficiency of repair-insulation operations due to creation of more resistant to water outbreak screen of water solutions of silicon-organic liquid - CL with controlled period of gelation excluding their preliminary hardening.

3 tbl

FIELD: oil and gas production.

SUBSTANCE: procedure consists in simultaneous effecting permeable walls of well borehole with scrapers for removal of filtration crust and with high-pressure jets generated from hydro-monitored heads of mud injector during well bottom hole deepening with drilling. Also, hydro-jets are directed at angle towards each other, they converge at one point on the wall of the well and destroy their nuclei, thus preventing destruction of walls of the well and formation of cavities. Well walls are subjected to the similar effect when the well is treated before lowering a producer for cementing. Drill agent containing dispersed solid particles is used as fluid for high-pressure hydraulic jets.

EFFECT: raised efficiency of mud fill, reduced expenditures for emergency-recovery operations and time for construction of well.

2 cl, 2 dwg

FIELD: oil and gas production.

SUBSTANCE: composition contains carbamide-formaldehyde resin, acid hardener and filler. As hardener there is used resorcin and ferro-chrome-lignosulphonate, and as filler there is used carbon white CW-120 or talk, or rubber powder, or chalk at the following ratio of components, in weight shares: carbamide-formaldehyde resin 100; resorcin 7-15, ferro-chrome-lignosulphonate - FCLS-M 1.5-25, filler 3-8.

EFFECT: reduced water loss of backfilling solution and increased strength and adhesion characteristics of cured composition.

2 cl, 1 tbl, 20 ex

FIELD: oil and gas production.

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EFFECT: reduced water loss of backfilling solution and increased strength and adhesion characteristics of cured composition.

2 cl, 3 tbl, 11 ex

FIELD: oil and gas industry.

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EFFECT: increasing efficiency of isolation works.

3 ex

FIELD: oil and gas production.

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EFFECT: reduced abrasive effect on well equipment, reduced friction resulted in decreased power consumption for pumping flow of suspended material.

17 cl, 7 dwg

FIELD: oil and gas production.

SUBSTANCE: procedure for insulation of water production in well consists in successive pumping sodium silicate and 5-15% solution of fluorosilicate ammonia in equal volumes through a buffer of fresh water into a required interval of insulation.

EFFECT: raised processability and efficiency of repair-insulation operations; reduced volume of associated produced water.

2 tbl, 1 ex

FIELD: oil and gas industry.

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EFFECT: increasing efficiency of insulating works, duration of effect, increasing overhaul period of operation, excluding metal corrosion of tubing string and production casing.

2 tbl, 1 ex

FIELD: oil and gas industry.

SUBSTANCE: servicing method of the well shaft involves recovery of sealing composition containing cross-linkable material, cross-linking agent, addition preventing water absorption, water and formiate compound to shorten the time of gel formation of cross-linkable material or retarder of gel formation, which includes chemical compound which is capable of acetylating, hydrolysing, thermal decomposition of organic amine, separately or in combination, so that one or several acids are obtained in the above composition, supply of sealing composition to the permeable zone of the well shaft and exposure of sealing composition for curing. As per the second version, the method involves recovery of sealing composition by means of combination of cross-linkable material, cross-linking agent, addition which prevents water absorption, water and formiate compound to shorten the time of gel formation of cross-linkable material or retarder of gel formation, which includes chemical compound which is capable of acetylating, hydrolysing, thermal decomposition of organic amine, separately or in combination, so that one or several acids are obtained in the above composition, and cement in which the quantity of cement is decreased to effective quantity to increase the time for gel formation of sealing composition approximately to 4 hours or more at the impact of environment in the well shaft on the sealing composition. Then, sealing composition is supplied to permeable zone of the well shaft and exposure of sealing composition is performed till gel is obtained.

EFFECT: improving well sealing efficiency.

20 cl, 2 dwg, 1 tbl, 1 ex

FIELD: gas and oil production.

SUBSTANCE: water composition for reservoir hydraulic fracturing contains water, ion-bound gel-like system including charged polymer, oppositely charged foaming agent and gas. The gel-like system and gas are present in amount sufficient for production of ion-bound foamed composition for hydraulic fracturing. Composition contains liquid for hydraulic fracturing including 5.5-7 gpt of the above said gel-like system and de-ionised water. The procedure for production of foamed compositions consists in production of the first composition, the second composition and in adding it to the first one at their specified ratio. The procedure for reservoir hydraulic fracturing includes production of liquid for hydraulic fracturing containing the above said gel-like system and proppant and in its pumping into the reservoir. The procedure for reservoir hydraulic fracturing includes production of liquid for hydraulic fracturing containing the above said gel-like system, its pumping into the reservoir at pressure of hydraulic fracturing and in pumping proppant after hydraulic fracture.

EFFECT: facilitating reservoir hydraulic fracturing at deficiency of hydration units.

45 cl, 1 tbl

FIELD: gas and oil production.

SUBSTANCE: water composition for reservoir hydraulic fracturing contains water, ion-bound gel-like system including charged polymer, oppositely charged foaming agent and gas. The gel-like system and gas are present in amount sufficient for production of ion-bound foamed composition for hydraulic fracturing. Composition contains liquid for hydraulic fracturing including 5.5-7 gpt of the above said gel-like system and de-ionised water. The procedure for production of foamed compositions consists in production of the first composition, the second composition and in adding it to the first one at their specified ratio. The procedure for reservoir hydraulic fracturing includes production of liquid for hydraulic fracturing containing the above said gel-like system and proppant and in its pumping into the reservoir. The procedure for reservoir hydraulic fracturing includes production of liquid for hydraulic fracturing containing the above said gel-like system, its pumping into the reservoir at pressure of hydraulic fracturing and in pumping proppant after hydraulic fracture.

EFFECT: facilitating reservoir hydraulic fracturing at deficiency of hydration units.

45 cl, 1 tbl

FIELD: gas and oil production.

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EFFECT: raised temperature of combustion of thermal source composition facilitating more deep heating and melting deposits of bottomhole zone of a reservoir, which plug channels and pores, while maintaining level of strength for compression of composition material.

FIELD: gas and oil production.

SUBSTANCE: composition of thermal source for treatment of bottomhole zone of well consists of granulated ammonia saltpetre of grade B, bi-chromate of potassium, epoxy resin of grade ED-20, plasticiser EDOS, and hardener Agidol of grade AF-2M. As components increasing strength of material of composition and temperature of its combustion compression this composition contains mixture of powders of aluminium of dispersity not over 50 mcm and nitro-acid barium of dispersity not over 0.5 mm at the following ratio of composition components, wt %: said saltpetre 52.5-53.0, potassium bio-chromate 2.4-2.5, epoxy resin of grade ED-20 14.3-14.4, plasticiser of grade EDOS 1.3-1.4, hardener Agidol of grade AF-2M 2.1-2.2, aluminium 10.9-10.5, and nitro-acid barium 16.5-16.0.

EFFECT: raised temperature of combustion of thermal source composition facilitating more deep heating and melting deposits of bottomhole zone of a reservoir, which plug channels and pores, while maintaining level of strength for compression of composition material.

FIELD: gas and oil production.

SUBSTANCE: unstable interval of reservoir in hole is opened by means of drilling equipment with inhibited polymer drilling mud on water base. Further, there is pumped water-repellent composition with the following component contents, wt %: hydrocarbon product 10.0-60.0; tall oil or a product of its processing 1.0-3.0, amine-containing emulsifier of reverse emulsions 1.0-3.0, the said inhibited polymer drilling mud - the rest. A bath out of composition is set in an interval of the unstable reservoir for a period of not less, than 0.5 hour. Further, during drilling water-repellent composition having been used in form of the bath is transited into drilling agent by circulation.

EFFECT: raised degree of strengthening unstable rock due to its maximal hydrophobisation and mudding by forming water repellent barrier in kind of layer of reverse emulsion in near-borehole zone of well upon reservoir opening; water-repellent barrier further prevents rock contact with disperse water medium of drill agent thus facilitating complex of structure-mechanical properties of said layer at following drilling.

6 cl, 1 tbl

FIELD: gas and oil production.

SUBSTANCE: according to first version drilling agent contains, wt %: bentonite PBMA 6.0-7.0, soda ash 0.1-2.0, caustic soda 0.1-0.5, Givpan 0.2-0.3, Lubriol 1.0, water - the rest. According to the second version drilling agent contains, wt %: bentonite PBMA 5.0, soda ash 0.1-0.5, caustic soda 0.1-0.5, Givpan 0.2-0.3, Kamcel PAC-VV 0.1-0.3, Kamcel PAC-SV 0.1-0.3, Lubriol 1.0, ALS 0.2-0.3, PES 0.1-0.2, water - the rest. According to the third version drilling agent contains, wt %: bentonite PBMA 2.0, soda ash 0.1-0.5, caustic soda 0.1-0.5, Kamcel PAC-VV 0.1-0.2, Kamcel PAC-SV 0.2, Lubriol 1.0, ALS 0.2-0.3, PES 0.1, water - the rest.

EFFECT: accident-free hole drilling under complicated mining-geological conditions, control over pH and removal of ions Ca2+ incoming into solution from carbonate rock.

3 cl, 8 tbl

FIELD: technological processes.

SUBSTANCE: invention relates to a method for inhibition of scale, for instance, barium-containing deposits, in a water system. The method includes pumping an aqueous solution of a scale inhibitor into wells of oceanic field, and the scale inhibitor is an amino acid modified with alkyl phosphonic acid in concentration from 0.1 to 100000 parts per million. A fragment of an amino acid may represent α-amino-acid or amino-acid that contains two or more atoms of carbon between a carboxyl group and an amino group.

EFFECT: method makes it possible to perform continuous oil production with efficient monitoring of scale formation using lower concentrations of an inhibitor.

9 cl, 47 ex

FIELD: gas and oil production.

SUBSTANCE: for decrease of liquid flow from well into reservoir or from reservoir into well procedure for treatment of well passing through underground reservoir consists in introduction of suspension containing thickened viscous-elastic surface-active liquid, agent controlling pH and degradable first solid substance. Further, the procedure consists in facilitating said suspension to prevent said flow of liquid for specified period of time and in facilitating first solid substance to decompose and said viscous-elastic surface active fluid to destroy by means of product of decomposition of said first solid substance. The said degradable first solid substance is decomposed at temperature of the reservoir for time of approximately 4 hours and 100 days. The said agent controlling pH retards rate of decomposition of the said degradable first solid substance. The invention is developed in dependent points of formula.

EFFECT: raised efficiency of well control for desired period of time.

15 cl, 3 ex, 5 dwg

FIELD: gas and oil production.

SUBSTANCE: procedure for preparing propping agent with coating consists in application of coating on surface of granule. Coating consists of binding and fibre, part of which projects beyond borders of a binding layer. Ratio between length of each fibre and diametre of granule is from 0.06 to 0.44. Additionally, there is carried out treatment with silicon-organic or fluoric-carbon oil-wetting agent at amount from 0.5 to 10% of fibre weight. Propping agent is prepared by the above described procedure. The invention is developed in dependent points of formula.

EFFECT: reduced water-cut of hydrocarbon raw stock at operation of well.

9 cl, 8 ex, 1 tbl

FIELD: gas and oil production.

SUBSTANCE: composition for restoration of pressure tightness of threaded connections of casings, insulation of thief zones and stabilisation of unstable permeable rock contains wt %: liquid glass of density ≥1420 kg/cm3 44.99-81.60, alkali drainage of caprolactam production of density ≥1110 kg/cm3 18-55, non-ionogenic surface active substance OP-10 0.01-0.40.

EFFECT: raised operational characteristics of composition at simplification of its production and reduced cost.

4 tbl, 2 dwg

FIELD: production and exploratory well drilling, particularly foaming drilling fluids used during penetration through incompetent rock intervals and during primary productive oil and gas deposit opening in the case of abnormally low formation pressure.

SUBSTANCE: foam composition comprises surfactant, foam stabilizer, water, water hardness control additive and lubricant. The water hardness control additive is sodium silicate. The lubricant is VNIINP-117 emulsion. The foam stabilizer is polyacrylamide, the surfactant is sulphonole. All above components are taken in the following amounts (% by weight): sulphonole - 0.8-1.5, sodium silicate - 0.2-0.5, polyacrylamide - 0.1-0.5, VNIINP-117 - 0.5-2, remainder is water.

EFFECT: reduced power inputs for well drilling, as well as reduced coefficient of friction between drilling tool and well wall.

1 tbl

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