The method of thermochemical treatment of the productive formation

 

The invention relates to the oil and gas industry. The technical result is to increase the efficiency and safety of the process. In the method of thermochemical treatment of the reservoir, including injection into the treatment area through the column tubing composition consisting of a fuel-oxidizer composition (GOS), containing components in wt.%: ethanolamine 40-82, nitrate 1-20, water 15-50, and initiator of combustion in the amount of 2-50% by weight GOS, the components of the composition are served in the reservoir separately: first the STATE and then to the zone location STATE type initiator combustion, which use compressed into tablets covered with wax or rosin (kapsulirovannyh), powder of at least one alkali metal borohydride from a number of: lithium, sodium, potassium, mainly borohydride sodium. Additionally, the composition of the fuel-oxidizer composition can be introduced not more than 10 wt.% one of the acids: nitric, acetic, phosphoric. 2 C.p. f-crystals, 1 tab., 1 Il.

The invention relates to the oil and gas industry, in particular to methods of thermochemical processing of producing (oil, gas, condensate) the wells or to activate wells, the productivity of which is reduced due to paraffin and wax deposits, breaking the link well with fluidness layer.

The known method of thermochemical processing bottom-hole formation zone, including injection into the treatment area through the column tubing (tubing) fuel-oxidizer composition (GOS), containing the source components in the following ratio, wt.%: urea 18,0-30,0; nitric acid 4,0-6,0; acetic acid 4,5-5,5; potassium permanganate 0,01-0,02; isopropylaminocarbonyl 0,3-3,0, water 13-18 and nitrate 38-60, subsequent introduction into the zone of a STATE of the combustion initiator containing aluminum (10-30 wt. %) and chromium oxide (70-90 wt.%) not more than 10% by weight GOS (EN 2126084 C1, E 21 In 43/24, 1999).

The method allows to increase the efficiency of the process of exploration wells, however, due to the high content of nitrate refers to a series of dangerous processes, which limits the possibilities of the method.

The known method of thermochemical processing bottom-hole formation zone and wellbore comprising introducing into the well through the tubing of an aqueous solution STATE, containing ammonium salts of organic or inorganic acids, the subsequent introduction of a STATE of at least one agent that initiates the a and GOS carried out separately: the STATE serves on tubing in the perforated zone, as the initiator of combustion is fed to the zone location STATE in the annular space of the tubing and casing pipe (EN 2102589 C1, E 21 In 43/25, 1998).

The introduction of the initiator STATE annulus often leads to damage to the outer surface of the tubing, which limits the lifetime of the latter.

The closest to the technical nature of the claimed method is a method of thermochemical treatment of the productive formation and fuel-oxidizer composition for its implementation (EN 2153065, E 21 IN 43/24, 2000).

The method comprises the injection into the treatment area through the tubing fuel and an oxidizing composition containing, in wt. % compound organic compounds, namely diamide oxalic acid and nitric acid 18-36; acetic ester of salicylic acid 4-5; potassium permanganate from 0.01 to 0.05, isopropylparaben 5-15, water 9-18 and niachou nitrate 21 - 63, then the delivery in the zone the STATE of combustion initiator, which is used as a composition based on alkali metal borohydride and methanol or diethyl ether in the amount of 5-95 wt.%, or alkali in the amount of 5-25 wt.%, and/or solid isopropylcarbonate in the amount of 5-40 wt.%, when this STATE is the initiator and served separately. The mechanism for separate delivery of the initiator of combustion in sleduyushim destruction of the container explosion corded torpedoes, ustanavlivaem along the entire length of the container. Burst trigger occurs when the descent of the container by contact of contacts corded torpedoes and power source (battery) mounted in the tubing.

This method of delivery of the initiator is unsafe due to possible failure of the explosion of a torpedo. Additionally, in itself, such a method of delivery of the initiator requires sophisticated equipment.

The second delivery path of the initiator is in a liquid state is injected through the lower part of the casing, which is equipped with aluminum tubes - shank, the length of which should exceed the perforation interval of the processed layer. However, this option is also not effective enough.

The high content of nitrate in the composition in the implementation of this method refers to unsafe options, and the method of delivery of the initiator complicates the process.

An object of the invention is the expansion of technological capabilities of the method by increasing safety, the possibility of treatment of all types of productive formation: oil, condensate, regardless of its depth, watering and use the device is with injection through a string of tubing in the treatment area of the formation STATE, containing complex organic compound with nitric acid, nitrate and water, and then the delivery in the area of its location initiator combustion - borohydride of an alkali metal, as specified complex compounds used ethanolamine, as specified borohydride at least one of a number of lithium, sodium, potassium, preferably sodium, in the form of compacted into tablets it powder coated wax or rosin, in the amount of 2-50 % by weight of fuel-oxidizer composition, in the following ratio of components in the STATE, wt.%: monoethanolamine 40-82; ammonium, sodium, potassium nitrate, mainly ammonium 1-20; water 15 - 50. The STATE may further comprise not more than 10 wt.% acids from the series: nitric, acetic, phosphoric.

Role dobavlennym acid is reduced to the regulation of the pH, which should not be above 5 or 6.

The use in the STATE of low-ethanolamine allows to reduce the content of nitrate to 1-20 wt. %, which increases the safety of use of GOS and fashion in General.

The proposed method can work in a wide range of starting temperatures and pressures in all weather conditions. From an economic point of use spacebags can be used reagents of any qualification and purity, except for dilute aqueous solutions.

An important feature of the structure is its low corrosiveness.

When the combustion STATE of the main emitted gases are hydrogen, carbon monoxide and nitrogen, i.e. a mixture of gases similar to synthesis gas. Adding nitrate in an amount of not more than 20 wt.%: ammonium, potassium or sodium, mainly ammonia, monitors the performance of the oxidant in the composition.

Get an integral part of the composition, in particular the STATE, either directly at the wellhead or in advance with subsequent delivery to the treatment site. To the calculated number of ethanolamine add the required amount of nitric acid, so that after passing the reaction mixture components had a pH of 6-7. When mixing the components, a large amount of heat, so it is necessary to provide the cooling capacity, in which mixing takes place. After cooling the mixture in it enter nitrate and, if necessary, specified in the formula of the acid. The resulting solution STATE is a liquid, the temperature of solidification which is minus 30C, which is a positive factor GOS, as it allows the specially equipped conditions. To this end, the powders borohydride metal pressed into tablets covered with wax or rosin (capsulebuy) and delivered to the place of use. Kapsulirovanie of borohydride increases safety when working with them and their delivery in the zone of a STATE.

Optimal preparation of the components of the composition in a stationary specially equipped conditions with subsequent safe transport them to the place of use, which excludes the implementation of the chemical operations by unqualified personnel near wells.

Studies on the stand showed that the proposed method is in the use STATE and the initiator is safe in operation.

The table presents some of the compositions.

Tests of the method in practice, held at one of the wells deeper than 4000 m Razumovsky field, has demonstrated the potential to increase oil flow by more than 5 times.

The proposed method was worked out using the device, the concept of which is shown in the drawing.

The device contains a string of tubing, the lower tube 1 which, with the beveled end 2, separated by at least three of the m composition; the second 4 - for the buffer fluid; third 5 - for the initiator of combustion, each of compartments separated from each other by means of sealing plugs 6, 7, 8 and 9, in the upper part of the third compartment 5, above the sealing tube 9 is installed shear pin 10, and in the lower part of the tube has a check valve 11 associated with shear pin 12 and the adjacent sealing plug 6.

Optionally, the device may contain packer 13 mounted between casing 14 and tubing pipe 1.

The device operates as follows. The device collects on the ground and then lowered through the casing 14 in the treatment area of the formation (bottom zone, in the zone of the reservoir to the sump, and so on).

In free volume columns tubing 1 above is fed under pressure by a pump (not shown) and squeezing the liquid that breaks the shear pin 10, presses on the sealing tube 9, and the initiator of combustion, such as borohydride sodium out of the compartment 5, the pressure on the sealing tube 8, further down the buffer within the compartment 4, its pressure fuel-oxidizer composition, for example in example 1, placed in the compartment 3, Prodanova sealing tube 6, rips shear valve 12 and through the reverse ATOR burning. In this operation STATE is supplied into the processing zone of the oil reservoir previously initiator.

For processing of the productive formation using the specified devices were used in the claimed composition consisting of a liquid STATE and initiator in the solid aggregate state, the composition of which is represented in the formula and table.

Reagents composition served in the productive zone of the reservoir separately.

As a result of chemical interaction of the reactants in the treated area, there is an intensive gassing and temperature rise in the treatment zone above 300C, which leads to the dissolution of asphalt-resinous deposits, recovery wells with a fluid containing layer of the formation, the formation of the main cracks.

As a result of processing in the reservoir increases greater than atmospheric pressure, the fluid (oil) is supplied into the tube space of the casing pipe 14 to pipe 1, and then outside. In that case, if you want the hole to close at the desired time, then put the packer 13 between the casing pipe 14 and the pipe 1.

To perform the inventive method can also be used in other types of devices, in which the reagent composition of the STATE and the initiator are served in the treated zone of the reservoir RA the surrounding wells as oil, and gas condensate, for renewal of abandoned wells of any complexity and depth, allows you to increase job security in the wells using STATE and initiators having a high energy to handle reservoir in any part of it: bottom-hole zone, in the area above the perforated interval and in the sump.

Claims

1. The method of thermochemical treatment of the reservoir, including pumping through the column tubing in the treatment area of the formation horseability GOS composition containing a complex organic compound with nitric acid, nitrate and water, and then the delivery in the area of its location initiator combustion - borohydride of an alkali metal, characterized in that, as specified complex compounds used ethanolamine, as specified borohydride at least one of a number of lithium, sodium, potassium in the form of compacted into tablets it powder coated wax or rosin, in the amount of 2 - 50% of the mass of the fuel-oxidizer composition in the following ratio of components in the STATE, wt.%:

Horseability composition:

Ethanolamine 40-the tives such as those they use mostly borohydride sodium.

3. The method according to p. 1 or 2, characterized in that STATE further comprises not more than 10 wt.% acids from the series: nitric, acetic, phosphoric.

 

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FIELD: oil and gas production.

SUBSTANCE: invention provides a method of developing oil pool allowing production of oil from water-rich oil reservoir under difficult geological-tectonic conditions in the last development stage. In the method, neutral salt of carbonic acid and acid solution are forced into formation through injecting well with water generated in gas-liquid fringe created in formation. After pumping of neutral salt of carbonic acid, acid solution is pumped by portions alternating with water pumping. Before pumping of acid solution portions beginning by at least second portion, selective insulation of high-permeable formation intervals is performed. Aforesaid neutral salt of carbonic acid utilized is sodium carbonate aqueous solution or aqueous suspension of calcium carbonate and aforesaid acid solution is aqueous hydrochloric acid solution. Selective insulation of high-permeable formation intervals involves use of freshly prepared controllable viscoelastic composition containing water-soluble acrylic polymer, cross-linking agent, thermal stabilizer, surfactant, and water. Summary concentration of acid solution is determined from concentration of neutral salt of carbonic acid on the base of stoichiometric proportions.

EFFECT: increased efficiency of maintaining formation pressure and thereby oil recovery of formation due to leveled displacement front and reduced probability of the rupture of formation rock backbone, and simplified control of phase state of gas-liquid fringe by changing pressure of pumped acid solution portions.

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