Interval isolation method of brine water influx in horizontal wells

FIELD: oil and gas industry.

SUBSTANCE: method includes running in of a flexible coiled tubing, filling of the well with blocking fluid in the interval from the bottomhole up to the lower part of water influx closest to the bottomhole. Water-shutoff compound is injected and flushed to the producing formation with simultaneous running out of the flexible coiled tubing up to the upper part of water influx closest to the bottomhole. At that the rate of the well horizontal section should be several times more than the rate of the flexible coiled tubing movement in order to ensure even placement of water-shutoff compound in the producing formation. The well horizontal section is filled with blocking fluid up to the next water influx shutoff interval and isolation works are performed in sequence at each influx interval starting from the interval closest to the bottomhole. Upon isolation of the last water influx the well is closed under pressure for reaction of water shutoff elements and destruction of the blocking fluid. Thereafter the flexible tubing is run in up to the bottomhole and the well is washed in volume of at least 2 circulation cycles.

EFFECT: increased shutoff efficiency of brine water influx in horizontal wells both with cased bottomhole and open bottmhole with a slotted liner or without it.

6 dwg

 

The invention relates to the oil and gas industry and is intended to isolate water production in horizontal wells producing wells.

The known method interval isolation and limitation of the water in horizontal wells (EN 2363841 C1 IPC E21B 43/32 (2006.01), publ. 10.08.2009). This method involves the injection of a blocking fluid with "the best time of life", within which is injected into the isolated interval specified volume of the polymer, the displacement of the polymer solution, stop wells for the period of structure formation of polymer injection destructor polymer and its displacement in the near well bore area.

The disadvantages of this method are the complexity of the recovery of the natural permeability in the near well bore area after completion of the process of structure formation of polymers, and complexity as the blocking fluid and the "optimum life time" of this fluid, which can be varied in situ under the influence of pressure and temperature, as well as in the process of interaction of the fluid with the reservoir fluid.

The closest technical solution chosen for the prototype is the way to isolate the flow of formation waters in horizontal oil or gas well (EN 2235873 C1, IPC 7 E21B 43/32, E21B 33/13, publ. 10.09.2004).

The method includes the descent into the borehole collar without coupling long tubes, the filling of the horizontal section of the wellbore blocking fluid with subsequent injection of water composition in water producing interval of the formation.

The disadvantages of this method are the necessity of killing the well, which significantly increases the time of the transaction, and no possibility of holding insulation of the inflow of formation water from two or more intervals of the horizontal wellbore.

The technical result of the invention is to develop an efficient method interval isolate the flow of formation waters in horizontal wells, providing selective penetration of water compositions mainly in the area of water production, and also in long horizontal wells cased or open bottom, and is equipped with a shank filter.

The task of the invention is to increase the efficiency of isolation of the flow of formation waters in horizontal wells cased or open bottom, and is equipped with a shank filter.

The task and the technical result is achieved by the fact that in the way that interval isolate the flow of formation waters in horizontal wells, including the descent into the well to the bottom of the flexible pipe coiled tubing installation and pumping toysareuse composition, in contrast to the known water composition pushes sequentially in each identified by geophysical surveys of wells, water shut-off interval, starting from the middle to the bottom, after the descent of the flexible pipe to the bottom in a flexible pipe serves blocking fluid by adding a destructor in an amount to provide the self-destruction blocking fluid after carrying out insulation work, filling the horizontal section of the wellbore in the interval from the bottom to the lower part of the middle to the bottom of the water shut-off interval, after which a flexible pipe is raised to the lower part of the middle to the bottom of the water shut-off interval, then a flexible tube pump the water composition in the following sequence: first pumped water component consisting of a hydrophobic additive ethyl silicate ETS-40 and oil at a ratio of 1:9 by volume, with the simultaneous rise of the flexible pipe to the upper part of the middle to the bottom of the water shut-off interval so that the fill rate of the horizontal section of the wellbore was 2 times greater than the speed of movement of the flexible pipe (VVIC=2VGT), and as soon as the water component will be pumped to the Shoe flexible pipe annulus and the annular space between tubing and casing tubing is erecruit and water component is forced into the reservoir to create a uniform screen, after the injection of a calculated quantity of water component, consisting of ETS-40 and oil pump buffer fluid, while at the approach of the buffer fluid to the Shoe flexible pipes produce descent flexible pipe to the lower part of the middle to the bottom of the water shut-off interval, then pumped water component consisting of a water-repelling silicone fluids NGL-11N, with simultaneous lifting of the flexible pipe to the upper part of the middle to the bottom of the water shut-off interval so that the fill rate of the horizontal section of the wellbore was 2 times greater than the speed of movement of the flexible pipe, then re-upload the buffer fluid, while at the approach of the buffer fluid to Shoe a flexible pipes produce descent flexible pipe to the lower part of the middle to the bottom of the water shut-off interval, then pumped water component consisting of a hydrophobic additive ethyl silicate ETS-40, with the simultaneous rise of the flexible pipe to the upper part of the middle to the bottom of the water shut-off interval so that the fill rate of the horizontal section of the wellbore was 2 times greater than the speed of movement of the flexible pipe, after produce water component consisting of a hydrophobic additive ethyl silicate ETS-40 in the amount not less than the amount of flexible pipes, produce descent flexible pipe is to the interval of the horizontal section of the wellbore, filled with the blocking fluid, and produce a complete horizontal section of the wellbore to a blocking liquid to the bottom of the following from the bottom of the water shut-off interval, after which a flexible pipe up to the bottom of the next from the bottom of the water shut-off interval, and then similarly produce isolation of each subsequent counting from the bottom, the water shut-off interval, after isolation farthest from the bottom of the water shut-off interval in the horizontal section of the well bore flexible pipe lift in the production casing and the borehole leave under the pressure of the reaction of water components and the destruction of blocking fluid, after which a flexible tube down to the bottom and make a straight flush wells in the amount of at least 2 cycles of circulation.

Water composition that includes several water components, provides selective isolation of flow of formation waters in the flooded wells with preservation of the productive characteristics of the PPP. It should be noted that when the concentration of the NGL-11N in ETS-40 more than 10% significantly reduced curing time, which can lead to the inability injection waterproofing composition into the reservoir, and a lower content of NGL-11N (less than 5%) in ETS-40 significantly increases the time of the polymerization process that the economic and unreasonably when carrying out waterproofing works well.

Presents drawings explain the scheme of implementation of the method in the horizontal section of the wellbore equipped with filter-shank for example techinterviews processing.

In Fig.1 shows a horizontal section 1 of the wellbore down to the bottom of the flexible pipe, prepared for injection blocking fluid. Positions on the drawing: horizontal section 1 of the wellbore, the reservoir 2, the operational column 3 and cement ring 4 for the production column 3, the filter shank 5 6 centralizers, flexible tube 7, the middle to the bottom interval of 8 water production, the subsequent intervals 9 water production, the lower part 10 of the middle to bottom of interval 8 water shut-off, the upper part 11 of the middle to bottom of interval 8 water shut-off.

In Fig.2 shows the horizontal section 1 of the wellbore filled with a blocking fluid 12, in the interval from the bottom to the lower part of the middle to the bottom of the water shut-off interval 11. Positions on the drawing: horizontal section 1 of the wellbore, the reservoir 2, the operational column 3 and cement ring 4 for the production column 3, the filter shank 5 6 centralizers, flexible tube 7, the middle to the bottom interval of 8 water production, the subsequent intervals 9 water production, the lower part 10 of the middle to bottom of interval 8 water shut-off, the upper part 1 of the middle to bottom of interval 8 water shut-off, blocking fluid 12.

In Fig.3 shows a horizontal section 1 of the wellbore and the reservoir 2 after pressing in the middle to the bottom interval of 8 water shut-off components 13, 14, 15 water composition. Positions on the drawing: horizontal section 1 of the wellbore, the reservoir 2, the operational column 3 and cement ring 4 for the production column 3, the filter shank 5 6 centralizers, flexible tube 7, the middle to the bottom interval of 8 water production, the subsequent intervals 9 water production, the lower part 10 of the middle to bottom of interval 8 water shut-off, the upper part 11 of the middle to bottom of interval 8 water shut-off, blocking fluid 12, the water component 13, consisting of a hydrophobic additive ethyl silicate ETS-40 oil and water component 14, consisting of a water-repelling silicone fluids NGL-11N, water component 15, consisting of a hydrophobic additive ethyl silicate ETS-40.

In Fig.4 shows a horizontal section 1 of the wellbore filled with a blocking fluid 12, in the interval from the bottom to the bottom of the next interval 9 water production and reservoir 2 with isolated middle-to-bottom intervals of 8 water production. Positions on the drawing: horizontal section 1 of the wellbore, the reservoir 2, the usage is fair column 3 and cement ring 4 for the production column 3, filter shank 5 6 centralizers, flexible tube 7, the middle to the bottom interval of 8 water production, the subsequent intervals 9 water production, blocking fluid 12, an impenetrable screen 16, formed as a result of interaction between the components 13, 14, 15 water composition, selective waterproof screen 17, formed as a result of the interaction of water component 15, consisting of a hydrophobic additive ethyl silicate ETS-40, with water.

In Fig.5 shows a horizontal section 1 of the wellbore in the process of technical sludge well under pressure after isolation of all intervals of 8, 9 water production, lifting the flexible tube 7 in the production casing 3. Positions on the drawing: horizontal section 1 of the wellbore, the reservoir 2, the operational column 3 and cement ring 4 for the production column 3, the filter shank 5 6 centralizers, flexible tube 7, blocking fluid 12, an impenetrable screen 16, formed as a result of interaction between the components 13, 14, 15 water composition, selective waterproof screen 17, formed as a result of the interaction of water component 15, consisting of a hydrophobic additive ethyl silicate ETS-40, with water.

In Fig.6 shows the horizontal section 1 of the wellbore after holding water is elezioni work and wash well. Positions on the drawing: horizontal section 1 of the wellbore, the reservoir 2, the operational column 3 and cement ring 4 for the production column 3, the filter shank 5 6 centralizers, an impenetrable screen 16, formed as a result of interaction between the components 13, 14, 15 water composition, selective waterproof screen 17, formed as a result of the interaction of water component 15, consisting of a hydrophobic additive ethyl silicate ETS-40, with water.

The method is implemented as follows.

In the horizontal section 1 of the wellbore down to the bottom of the flexible tube 7 coiled tubing installation, which serves blocking fluid 12. As a blocking fluid 12 use cross-linked gel with added destructor in an amount to provide the self-destruction blocking fluid 12 after carrying out insulation work, filling in the horizontal section 1 of the wellbore in the interval from the bottom to the lower part 10 of the middle to bottom of interval 8 water shut-off defined by the results of the GIS. Then a flexible pipe 7 to raise the lower part 10 of the middle to bottom of interval 8 water production. Further, in the flexible tube 7 download water composition consisting of several components, injected sequentially: water isolating components is NT 13, consisting of a hydrophobic additive ethyl silicate ETS-40 and oil; buffer liquid (e.g. oil); water component 14, consisting of a water-repelling silicone fluids NGL-11N; buffer liquid; water component 15, consisting of a hydrophobic additive ethyl silicate ETS-40, in the following sequence: first pumped water component 13, consisting of a hydrophobic additive ethyl silicate ETS-40 and oil at a ratio of 1:9 by volume, with the simultaneous rise of the flexible tube 7 to the upper part 11 of the middle to bottom of interval 8 water shut-off so that the filling speed (VVIC) horizontal section 1 of the wellbore was 2 times the speed (VGT) flexible pipe 7 (VVIC=2VGT), to ensure uniform distribution of the composition in the reservoir. And as soon as the water component 13 will be pumped to the Shoe flexible tube 7, the annulus and the annular space between the flexible pipe 7 and the column tubing cover and water component 13 is forced into the reservoir to create a uniform water screen, pushing back the front of the water from the borehole to the depth of the formation. After the injection of a calculated quantity of water component 13 fetch buffer fluid, for example oil, n is, and this with the approach of the buffer fluid to the Shoe flexible tube 7 is descent flexible pipe 7 to the lower part 10 of the middle to bottom of interval 8 water production. Next, pump the water component 14, consisting of a water-repelling silicone fluids NGL-11N, with simultaneous lifting of the flexible tube 7 to the upper part 11 of the middle to bottom of interval 8 water shut-off so that the fill rate of the horizontal section 1 of the wellbore was 2 times greater than the speed of movement of the flexible tube 7. Then re-upload the buffer liquid (oil), while at the approach of the buffer fluid to the Shoe flexible tube 7 is descent flexible pipe 7 to the lower part 10 of the middle to bottom of interval 8 water shut-off, then pump the water component 15, consisting of a hydrophobic additive ethyl silicate ETS-40, with simultaneous lifting of the flexible tube 7 to the upper part 11 of the middle to bottom of interval 8 water shut-off so that the fill rate of the horizontal section 1 of the wellbore was 2 times greater than the speed of movement of the flexible tube 7. After produce water component 15 in the amount not less than the volume of the flexible tube 7 produce descent flexible pipe 7 to the interval of the horizontal section 1 of the wellbore filled with a blocking fluid 12, and produce a complete horizontal section 1 of the wellbore blocking fluid 12 to the lower part of the next interval 9 water production. Then a flexible pipe 7 to raise the lower part sledujushih the interval 9 water production, and then similarly is the isolation of each subsequent counting from the bottom, interval 9 water production. After isolation farthest from slaughter interval 9 of water in the horizontal section 1 of the well bore flexible pipe 7 raise in the production casing and the borehole leave under the pressure of the reaction of water components 13, 14, 15 and destruction blocking fluid 12, after which a flexible pipe 7 down to the bottom and make a straight flush well at least 2 cycles of circulation.

An example implementation of method 1

Well with a horizontal end of a length of 400 m and a diameter of 140 mm, equipped with a filter-shank 5 outer diameter of 114 mm, lowered to the bottom. Produced water is supplied at intervals of the horizontal section 1 of the wellbore 100-110 m, 125-138 m, 150-166 m (counting from the beginning of the horizontal section 1 of the wellbore).

Waterproofing work is carried out using coiled tubing installation with the flexible pipe 7 with a diameter of 38.1 mm (length of pipe on reel 3500 m) in the following sequence.

In the well down to the Shoe of the filter-shank 5 of the flexible tube 7, which is pumped 2,92 m3blocking fluid 12, which uses a cross-linked gel, with added destructor, on the basis of sodium peroxide, to fill the horizontal part is ka 1 borehole in the interval 166-400 m (counting from the beginning of the horizontal section 1 of the wellbore). Then a flexible pipe 7 raise at 234 metres from the Shoe of the filter-shank 5, and a flexible pipe 7 download water composition, which is brought to the Shoe flexible tube 7, and then block the annulus and the annular space between the flexible pipe 7 and tubing.

Water composition consisting of water components 13, 14, 15, they fill in the following sequence:

1) pumped water component 13, consisting of a hydrophobic additive ethyl silicate ETS-40 in the amount of 1.6 m3and oil in the volume of 14.4 m3with simultaneous lifting of the flexible tube 7 to 250 m from the Shoe of the filter-shank 5 with the speed of 0.125 m/s;

2) upload the buffer liquid (oil) in the amount of 0.4 m3and is the descent of the flexible tube 7 to 234 m from the Shoe of the filter-shank 5;

3) pump the water component 14, consisting of a water-repelling silicone fluids NGL-11N in the amount of 1.6 m3with simultaneous lifting of the flexible tube 7 250 m from the Shoe of the filter-shank 5 with the speed of 0.125 m/s;

4) upload the buffer liquid (oil) in the amount of 0.4 m3and is the descent of the flexible tube 7 to 234 m from the Shoe of the filter-shank 5;

5) inject water component 15, consisting of a hydrophobic additive ethyl silicate ETS-40 in the amount of 12.8 m3, simultaneously with the temporary lifting of the flexible tube 7 250 m from the Shoe of the filter-shank 5 with the speed of 0.125 m/s;

6) download and squeezing the liquid, such as oil, in the amount of 3 m3.

Produce descent flexible pipe 7 to the interval of the well, filled a blocking fluid 12 (234 m from the Shoe of the filter-shank 5), which is pumped, using a fitting, 0.35 m3blocking fluid 12 that fills the horizontal section 1 of the wellbore in the interval 234-262 m from the Shoe of the filter-shank 5. Then a flexible pipe 7 to raise 262 m from the Shoe of the filter-shank 5 and produce isolation from the next slaughter interval 9 water production (125-138 m, counting from the beginning of the horizontal section 1 of the wellbore), and then in the same sequence described above, is the isolation of the last interval of water (100-110 m, counting from the beginning of the horizontal section 1 of the wellbore). Then a flexible pipe 7 raise in the production casing 2, and the well is left for 24 hours under the pressure of injection.

Then the flexible tube 7 is lowered into the well until the Shoe filter-shank 5 and produce direct washing of the wells in a volume of 2 cycles of circulation.

An example implementation of method 2

Well with a horizontal end of a length of 1000 m and a diameter of 140 mm, equipped with a filter-shank 5 outer diameter of 102 mm, lowered to the bottom. Produced water is supplied at intervals of the horizontal section 1 strackbein 435-460 m, 734-760 m, 820-852 m (counting from the beginning of the horizontal section 1 of the wellbore).

Waterproofing work is carried out using coiled tubing installation with the flexible pipe 7 with a diameter of 44.5 mm (length of pipe on reel 3000 m) in the following sequence.

After isolation of the middle to bottom of interval 8 water production (820-852 m, counting from the beginning of the horizontal section 1 of the wellbore), the lower flexible pipe 7 to the interval of the horizontal section 1 of the wellbore filled with a blocking fluid 12 (148 m from the Shoe of the filter-shank 5), and upload using the fitting, 1.15 m3blocking fluid 12, which uses a cross-linked gel, with added destructor, on the basis of sodium peroxide, to fill the horizontal section 1 of the wellbore in the interval 148-240 m (counting from the beginning of the horizontal section 1 of the wellbore). Then a flexible pipe 7 raise to 240 m from the Shoe of the filter-shank 5, and a flexible pipe 7 download water composition, which is brought to the Shoe flexible tube 7, and then block the annulus and the annular space between the flexible pipe 7 and tubing.

Water composition consisting of water components 13, 14, 15, they fill in the following sequence:

1) pumped water component 13, the status is of ASI of hydrophobic additives ethyl silicate ETS-40 in the amount of 2.6 m 3and oil in the volume of 23.4 m3with simultaneous lifting of the flexible tube 7 to 266 m from the Shoe of the filter-shank 5 with a speed of 0.2 m/s;

2) upload the buffer liquid (oil) in the amount of 0.4 m3and is the descent of the flexible tube 7 to 240 m from the Shoe of the filter-shank 5;

3) pump the water component 14, consisting of a water-repelling silicone fluids NGL-11N in the amount of 2.6 m3with simultaneous lifting of the flexible tube 7 to 266 m from the Shoe of the filter-shank 5 with a speed of 0.2 m/s;

4) upload the buffer liquid (oil) in the amount of 0.4 m3and is the descent of the flexible tube 7 to 240 m from the Shoe of the filter-shank 5;

5) inject water component 15, consisting of a hydrophobic additive ethyl silicate ETS-40 in the volume of 46.8 m3with simultaneous lifting of the flexible tube 7 266 m from the Shoe of the filter-shank 5 with a speed of 0.2 m/s;

6) download and squeezing the liquid, such as oil, in the amount of 3.5 m3.

Produce descent flexible pipe 7 to the interval of the well, filled a blocking fluid 12 (266 m from the Shoe of the filter-shank 5), which is pumped, using a nozzle, of 3.73 m3blocking fluid 12 that fills the horizontal section 1 of the wellbore in the interval 240-540 m from the Shoe of the filter-shank 5. Then a flexible pipe 7 raises to 540 m from Basma the and filter-shank 5 and produce the isolation of the latter, farthest from slaughter interval 9 water production (435-460 m, counting from the beginning of the horizontal section 1 of the wellbore). Then a flexible pipe 7 raise in the production casing 2, and the well is left for 24 hours under the pressure of injection.

Then the flexible tube 7 is lowered into the well until the Shoe filter-shank 5 and produce direct washing of the wells in a volume of 2 cycles of circulation.

An example implementation of method 3

Well with a horizontal end of a length of 1500 m and a diameter of 161 mm, equipped with a filter-shank 5 outer diameter of 127 mm, lowered to the bottom. Produced water is supplied at intervals of the horizontal section 1 of the wellbore 327-356 m, 789-793 m, 994-1020 m (counting from the beginning of the horizontal section 1 of the wellbore).

Waterproofing work is carried out using coiled tubing installation with the flexible pipe 7 50,3 mm diameter (length of pipe on reel 3000 m) in the following sequence.

After isolation of the middle to the bottom 8 and one of the next 9 inflow intervals (789-793 m, 994-1020 m, counting from the beginning of the horizontal section 1 of the wellbore), the lower flexible pipe 7 to the interval of the horizontal section 1 of the wellbore filled with a blocking fluid 12 (707 m from the Shoe of the filter-shank 5), and upload using the fitting, 7,31 m3blocking fluid 12, as to the second uses a cross-linked gel, adding a destructor, on the basis of sodium peroxide, to fill the horizontal section 1 of the wellbore in the interval 707-1144 m (counting from the beginning of the horizontal section 1 of the wellbore). Then a flexible pipe 7 to raise 1144 m from the Shoe of the filter-shank 5, and a flexible pipe 7 download water composition, which is brought to the Shoe flexible tube 7, and then block the annulus and the annular space between the flexible pipe 7 and tubing.

Water composition consisting of water components 13, 14, 15, they fill in the following sequence:

1) pumped water component 13, consisting of a hydrophobic additive ethyl silicate ETS-40 in the amount of 2.9 m3and oil voyame 26,1 m3with the simultaneous rise of the flexible tube 7 to 1173 m from the Shoe of the filter-shank 5 with a speed of 0.1 m/s;

2) upload the buffer liquid (oil) in the amount of 0.4 m3and is the descent of the flexible tube 7 to 1144 m from the Shoe of the filter-shank 5;

3) pump the water component 14, consisting of a water-repelling silicone fluids NGL-11N in the amount of 2.9 m3with the simultaneous rise of the flexible tube 7 to 1173 m from the Shoe of the filter-shank 5 with a speed of 0.1 m/s;

4) upload the buffer liquid (oil) in the amount of 0.4 m3and proizvoditas flexible tube 7 to 1144 m from the Shoe of the filter-shank 5;

5) inject water component 15, consisting of a hydrophobic additive ethyl silicate ETS-40 in the volume of 35.6 m3with simultaneous lifting of the flexible tube 7 1173 m from the Shoe of the filter-shank 5 with a speed of 0.1 m/s;

6) download and squeezing the liquid, such as oil, in the amount of 4.3 m3.

Produce lift flexible tube 7 in the production casing 2, and the hole left for 24 hours under the pressure of injection.

Then the flexible tube 7 is lowered into the well until the Shoe filter-shank 5 and produce direct washing of the wells in a volume of 2 cycles of circulation.

Method interval isolate the flow of formation waters in horizontal wells, including the descent into the well to the bottom of the flexible pipe coiled tubing installation and pumping of water composition, wherein the water composition is forced successively in each identified by geophysical surveys of wells, water shut-off interval, starting from the middle to the bottom, after the descent of the flexible pipe to the bottom in a flexible pipe serves blocking fluid by adding a destructor in an amount to provide the self-destruction blocking fluid after carrying out insulation work, filling the horizontal section of the wellbore in the interval from the bottom to the lower part of the middle to bottom of interval water is ritika, then a flexible pipe to raise the lower part of the middle to the bottom of the water shut-off interval, then a flexible tube pump the water composition in the following sequence: first pumped water component consisting of a hydrophobic additive ethyl silicate ETS-40 and oil at a ratio of 1:9 by volume, with the simultaneous rise of the flexible pipe to the upper part of the middle to the bottom of the water shut-off interval so that the fill rate of the horizontal section of the wellbore was 2 times greater than the speed of movement of the flexible pipe, and as soon as the water component will be pumped to the Shoe flexible pipe annulus and the annular space between tubing and column tubing cover and water component is forced into the reservoir to create a uniform screen, after the injection of a calculated quantity of water component, consisting of ETS-40 and oil pump buffer fluid, while at the approach of the buffer fluid to the Shoe flexible pipes produce descent flexible pipe to the lower part of the middle to the bottom of the water shut-off interval, then pumped water component consisting of a water-repelling silicone fluids NGL-11N, with simultaneous lifting of the flexible pipe to the upper part of the middle to bottom of interval waters of the influx of so, order fill rate of the horizontal section of the wellbore was 2 times greater than the speed of movement of the flexible pipe, then re-upload the buffer fluid, while at the approach of the buffer fluid to the Shoe flexible pipes produce descent flexible pipe to the lower part of the middle to the bottom of the water shut-off interval, then pumped water component consisting of a hydrophobic additive ethyl silicate ETS-40, with the simultaneous rise of the flexible pipe to the upper part of the middle to the bottom of the water shut-off interval so that the fill rate of the horizontal section of the wellbore was 2 times greater than the speed of movement of the flexible pipe, after produce water component consisting of hydrophobic additives ethyl silicate ETS-40 in the amount not less than the amount of flexible pipes, produce descent flexible pipe to the interval of the horizontal section of the wellbore filled with a blocking liquid, and produce a complete horizontal section of the wellbore to a blocking liquid to the bottom of the following from the bottom of the water shut-off interval, after which a flexible pipe up to the bottom of the next from the bottom of the water shut-off interval, and then similarly produce isolation of each subsequent counting from the bottom, the water shut-off interval, after isolation farthest from the bottom and the water shut-off interval in the horizontal section of the well bore flexible pipe lift in the production casing, and well leave you under pressure to the reaction of water components and the destruction of blocking fluid, after which a flexible tube down to the bottom and make a straight flush well at least 2 cycles of circulation.



 

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10 cl, 6 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes pumping and flushing of the polymer solution and well shutdown for the period of polymer gelling. According to the invention geophysical survey is made in order to specify the interval of water influx. Computational experiments are made on the basis of water influx isolation and limitation mathematical model thus evaluating stability of polymer screens for different viscosity and volume of polymer solutions in oil- and water-bearing areas of the productive stratum at the limit depression and depression in service, residual water and oil resistance factors for injected polymer solutions considering type of the productive stratum as well as water cut of the produced oil and its flow rate after insulation and limitation of water influx. At that viscosity of polymer solutions are evaluated in time at temperature of the productive stratum. Then the polymer is selected with required viscosity and volume of injection ensuring stability of the screen based on the above polymer in oil-bearing area of the productive stratum. The selected polymer solution is injected in the calculated volume.

EFFECT: increased efficiency of the method.

2 cl, 4 dwg, 1 tbl

FIELD: oil and gas industry.

SUBSTANCE: operation method for a well placed in oil-water contact zone contains the stages at which the well is perforated in the oil-containing area of the stratum and water-containing area of the stratum; dual product extraction is arranged from the oil-containing area and water-containing area of the stratum through the above perforation with the controlled rate; at that well production rate is controlled and equipment is selected for production on the basis of the certain ratio and periodically changed physical and chemical and reservoir properties.

EFFECT: improvement of efficiency and reliability for operation of wells placed in the oil-water contact zone.

3 cl, 3 dwg

FIELD: oil-and-gas industry.

SUBSTANCE: in compliance with this method, well is shut in to open casing and linear gate valves for pumping highly mineralised water into annular space. Casing valve is closed to release excess pressure for pumping of highly mineralised water into seam in preset amount at 7.5-10.0 MPa. Pumping is stopped to close the well and to level the pressure for uniform distribution of highly mineralised water in the seam water-flooded zone. Well is started to run it to constant duty for up to 5 days. Well is operated at seam depression of 0.5-1.5 MPa. Volume of injected highly mineralised water is defined by analytical expression.

EFFECT: higher efficiency.

1 ex

FIELD: oil and gas industry.

SUBSTANCE: method involves drilling of a deposit with production wells crossing a formation consisting of a water-saturated zone separated with a non-permeable natural interlayer with an oil-saturated zone, lowering of a casing string with further formation perforation, investigation of its water-oil saturation and their deposit intervals, dimensions of non-permeable natural interlayer, creation of a screen from an insulating compound, which separates water-saturated zone of the formation from oil-saturated zone, cutting of some part of the casing string, enlarging the well shaft at that interval; filling of the enlarged interval of the well shaft with insulating compound, drilling of insulating compound after the insulating compound hardening. At arrangement of water-saturated zone below oil-saturated zone of the formation and at thickness of the non-permeable natural interlayer of more than 3 m, some part of the casing string is cut from the internal of 1.5 m below the roof of the non-permeable natural interlayer and up to the interval of 1.5 m above the bottom of the water-saturated zone of the formation. The well shaft is enlarged at each interval. A setup consisting of a shank and a hydraulic disconnector is assembled on the well head in an upward direction. The shank is made in the form of pipes with outer diameter of less than inner diameter of the casing string. A check valve is installed on the lower end of the shank with possibility of its opening or closing under action of excess pressure, and a filter is installed below it. The shank length of chosen with the size of not less than distance from the mine face up to the interval of 1.5 m below the roof of non-permeable natural interlayer. The assembled setup on the filling pipe string is lowered to the well till the lower end of the shank is borne against the mine face. A hydraulic disconnector is actuated; after that, the filling pipe string is raised to the height of 1 m and lowered; then, an insulating compound is pumped via the pipe string and the shank and the insulating compound is forced through by pumping of forcing-through liquid to the pipe string through the check valve opened under action of excess pressure and the filter of the shank to tubular annulus and brought to the shank head. The filling pipe string with the hydraulic disconnector is removed from the well and the insulating compound is left till it is cured. Microcement is used as an insulating compound. After the insulating compound is cured, drilling of the insulating compound and the check valve is performed, and drill products are removed from the shank by flushing.

EFFECT: improving development efficiency owing to excluding behind-the-casing flows; reducing labour intensity and duration of the method.

6 dwg

FIELD: oil and gas industry.

SUBSTANCE: water inflow zones cementing method includes running in of the tubing string into the well, setting of the tubing string open end above the water inflow zone. Specific permeability is determined for the water inflow zone in two operating modes of the pumping unit. When specific permeability is more than 2 m3/(h·MPa) flush liquid and waterproofing compound are injected in sequence until specific permeability reaches 0.5-2 m3/(h·MPa). Then total volume of cement suspension is determined against specific permeability of the water inflow zone. Simultaneously cement suspension is made of suspension of oil-well Portland cement in quantity of 35% of the total cement suspension volume and suspension of microcement quantity of 65% of the total cement suspension volume. When specific permeability is 0.5-2 m3/(h·MPa) flush liquid, suspension of microcement quantity and suspension of oil-well Portland cement are injected in sequence. Then the consumption rate and injection pressure is increased up to the limit value for the production casing, and at this rate with this pressure maintained flush fluid and the whole volume of the microcement suspension is flushed. Then the consumption rate and injection pressure is decreased up to the permitted minimum value at which the well continues receipt, and oil-well Portland cement suspension is flushed to the water inflow zone until zero permeability is obtained. The flushing is stopped; the process is set to exposure, then remains of cement Portland cement suspension are washed with counterpressure flow equal to final pressure of flushing of the oil-well Portland cement suspension to the water inflow zone.

EFFECT: increased efficiency of water inflow zones cementing in wells, increased coverage of the water inflow zones by cementing.

2 tbl, 3 ex

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil production. Proposed method comprises lowering the string into well to inject acid compounds via said string into bed. Prior to processing, geophysical survey is executed to randomly divide borehole into intervals depending upon intensity of inflow and type of extracted fluid. Assembly with two packers on string is lowered into processed interval. Intervals are processing with isolation of every interval by assembly with two packers: interval with high-intensity water inflow is processed the first by injection of back water-oil emulsion at flow rate of 6-12 m3/h. Interval with mixed inflow of water and oil is processed the second at injection of back oil-acid emulsion at flow rate of 24-36 m3/h. Oil-saturated interval is processed the first by injection of acid at flow rate of 54-66 m3/h.

EFFECT: decreased well stream watering by 20-70%, higher oil yield.

3 ex, 1 dwg

Plugging material // 2530805

FIELD: oil and gas industry.

SUBSTANCE: plugging material contains portland cement, silica-containing component, calcium chloride hardener and a plasticizing agent, at that portland cement, calcium chloride and silica-containing component are subjected to joint disintegrating treatment, and silica-containing component consists of tripoli powder and silica sand with the ratio of 1:10, besides plugging material contains additionally an expansion agent and reinforcement additive with the following ratio, wt %: portland cement - 50-70, silica-containing component consisting of tripoli powder and silica sand with the ratio of 1:10 - 30-50, reinforcement additive - 0.2-0.3 above 100%, plasticizing agent - 0.1-1.0 above 100%, calcium chloride - 0.1-3.0 above 100%, expansion agent - 3.0-5.0 above 100%.

EFFECT: producing the plugging material that ensures fast hardening at normal temperatures and thermal stability of cement stone with high strength properties.

1 ex, 3 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to oil and gas well casing. The grouting composition for cementing a low-pressure well includes 60.5-63.7 wt % portland cement, 0.61-1.53 wt % aluminium salt. The composition further includes 0.003-0.045 wt % oxyethylated alkylphenols 3-AI, 0.61-1.3 wt % carbonates, which are in the form of potassium or sodium carbonate, and water.

EFFECT: low density of the grouting mortar and improved sedimentation stability thereof.

1 tbl, 7 ex

FIELD: oil and gas industry.

SUBSTANCE: method of production string sealing includes run in hole of the production pipe string. Two components of a waterproof sealant are injected in sequence through the pipe string with their separation by plugs, at that the first component is lifted from the pipe string at its output through annular space. Thereafter they are injected jointly to the interval of the production string failure by displacing unit through tubing volume and annular space. At that the production string is equipped with a packer from outside before run in hole and with a body above the packer, at that the body is interconnected with the pipe string and through a spring-loaded valve passing from outside to inside with annular space. At that after the first component lifting through annular space the latter is packed with the packer above the failure interval with specific injectivity from 0.5 up to 2.0 m3/(h·MPa). Moreover, while injecting jointly components of the waterproof sealant the first component from annular space is injected in order to mix them gradually in required proportion through spring-loaded valve and body to the second component injected through annular space.

EFFECT: improving efficiency of remedial cementing at production string sealing.

1 tbl, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: thermothropic gelling agent for shutoff of water influx to wells and oil recovery increase contains aluminium salts in quantity of 2.5-20.0 wt % in the form of aluminium chloride or polyoksichloride and fresh or mineralized water. At that the compound contains additionally acetate in the form of sodium acetate in quantity of 2.0-10.0 wt %, it may contain 0.0-30.0 wt % of carbamide and 0.0-2.5 wt % of fine polyacrylamide with diameter of particles of 40-80 mcm.

EFFECT: improving efficiency of water influx shutoff and increasing oil recovery.

2 cl, 6 ex, 3 tbl

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to compositions for isolation of inflow of formation fluid in wells located in watered zones at pull-out of hole under conditions of abnormally low formation pressures. Proposed composition comprises 10 vol. % of water-repellant organosilicon fluid ("ГКЖ-11Н"), 85 vol. % of ethyl silicate "ЭТС"-40 as catalyst and 5 vol. % of diatomite as thickener.

EFFECT: higher efficiency of said jobs.

1 tbl

FIELD: oil and gas industry.

SUBSTANCE: composition for isolation of water influx to oil producers includes amides of fatty acids and fresh water. At that as amides of the fatty acids the composition contains 40-50 wt % of ethanolamides of fatty acids with 12-18 carbon atoms, among which there are additional 10-20 wt % of secondary atoms and 10-20 wt % of polyatomic alcohols.

EFFECT: improving efficiency of water shutoff treatment in producers due to use of homogenous composition with selective action towards water-saturated sites of terrigenous and carbonate reservoirs.

1 ex, 1 tbl, 4 dwg

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is related to the methods which can be used in treatment of underground strata and, more specifically to the improved methods for distribution and deviation of fluids in underground strata. The method includes introduction of the first lost circulation material to an underground stratum through which the wellbore passes in order to reduce or prevent fluid flow to the first part of the underground stratum. Reduction or prevention is made by the first lost circulation material to the first part of the underground stratum. A part of the first fluid is introduced to the second part of the underground stratum having a higher fluid resistance than the first part of the underground stratum. The second lost circulation material is introduced to the underground stratum through which the wellbore passes in order to reduce or prevent fluid flow to the second part of the underground stratum. A part of the second fluid is introduced to the first part of the underground stratum with the first flow rate. The first lost circulation material is removed from the underground stratum. By means of temperature monitoring in the respective part of the underground stratum the time is determined when the first lost circulation material was removed, at least partially, from the underground stratum. The second fluid is introduced into the first part of the underground stratum.

EFFECT: increasing isolation efficiency.

12 cl, 8 dwg

FIELD: oil and gas industry.

SUBSTANCE: compound contains 20-25 wt % of bentonite clay, 55-60 wt % of hydrocarbon fraction, 5-10 wt % of sodium carbonate and 5-15 wt % of Portland cement.

EFFECT: improving efficiency in removal of fluids crossflow behind production strings in oil and gas wells and increasing duration of their life between overhauls.

2 ex

FIELD: oil and gas production.

SUBSTANCE: invention relates to grouting mortars used for cementing casing pipes of gas, gas-condensate, and oil wells complicated by presence of formations with low hydraulic rupture pressure as well as presence of permafrost rocks. Light-weight grouting mortar contains 47.0-60.0% special-type cement, 6.6-11.8% clinoptilite as light-weight additive, and water. As a result, casing-pipe annulus incidents during boring and running wells are avoided owing to improved parameters of grouting cement, in particular increased sedimentation stability of mortar, dimensional stability and needed strength of cement stone at low positive and negative temperature in early hardening stages are achieved at simultaneous lowering of grouting mortar density.

EFFECT: improved performance characteristics of grouting mortar.

1 tbl

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