Method for shutoff of stratal water influx

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil and gas industry, and namely to shutoff of stratal water influx in gas and gas condensate wells by means of coil tubing technique. The concept of the invention is as follows: the method lies in running in of a flexible pipe into inner cavity of gas-well production tubing up to the bottomhole and cleanout of the bottomhole from liquid and mechanical impurities, filling of the well with gas condensate, subsequent lifting of the flexible pipe up to tubing shoe, injection to the perforated interval through annular space between the flexible pipe and production tubing of the first package of hydrophobisated compound containing ethyl silicate ETC-40 with 10% concentration in gas condensate with volume of 1-2 m3 per each meter of gas net pay with its further flushing to the stratum and formation of water shutoff screen in the productive stratum thus pushing stratal water out from the bottomhole to the stratum depth radially. Then through annular space between the flexible pipe and production tubing injection of the second package of hydrophobisated compound is made containing ethyl silicate ETC-40 with 100% concentration in volume of 0.4-0.6 m3 per each meter of gas net pay with its further flushing to the stratum by gas condensate in the volume of production tubing and inner space of the well - production string below the tubing shoe. Then running in of a flexible pipe is repeated to the interval of gas-water contact, water-repellant organosilicon liquid GKZH-11N is injected through the flexible pipe in volume of 0.10-0.15 m3 per each meter of water-bearing thickness of the stratum, return washing of the well during 2 cycles with back pressure. The flexible pipe is removed from the well; the latter is withheld for reaction under pressure.

EFFECT: potential shutoff of stratal water influx without well killing operation and maintenance of gas net pay.

3 ex, 4 dwg

 

The invention relates to the oil and gas industry, namely to isolate the flow of formation waters in the gas and gas condensate wells using coiled tubing technology.

There is a method of isolating the flow of formation waters, including pumping in vodoprivredu part of the layer of cement slurry under pressure and patience well at the time of setting of cement slurry [Reference book on current and capital repair of wells / A. D. Amirov and others - M.: Nedra, 1979. - S. 238-241].

The disadvantages of this method is the inability to isolate the flow of formation waters in the gas and gas condensate wells without killing them, and the inevitable pollution Gazpromavia of the reservoir due to the ingress of backfill material when carrying out waterproofing works.

There is a method of isolating the flow of formation waters, including injection vodoprivredu part of the layer of cement slurry under pressure and patience well at the time of setting of cement slurry [RF Patent №2127807, IPC E21B 43/32].

The disadvantages of this method is the inability to isolate the flow of formation waters in the gas and gas condensate wells without killing.

The closest technical solution is the way to isolate the flow of formation waters, including injection vodoprivredu part of the reservoir swab the aqueous solution under pressure through a flexible tube (GT) coiled tubing installation and patience well at the time of setting of cement slurry [RF Patent №2244115, IPC E21B 43/32].

The disadvantage of this method is the possible contamination of the gas-bearing portion of the layer of cement mortar and reducing gas saturated thickness of the layer.

The challenge when creating the invention is to provide opportunities isolate the flow of formation without plugging wells with saving gas saturated thickness of the layer.

Achievable technical result, which is obtained by the invention, is the ability to isolate the flow of formation waters without killing the well by limiting the degree of contamination of the gas-saturated part of the reservoir and providing quality plugging water-saturated part of the reservoir without reducing the gas-saturated thickness of the layer.

The task and the technical result is achieved by the fact that the isolation of the flow of formation waters is carried out by descent flexible tube (GT) in the internal cavity of the tubing string (LK) gas wells to bottom and bottom-hole cleaning from liquids and solids, fill wells and gas condensate, the subsequent rise of GT to boot LK, injection into the perforation interval through the annular space (KP) between GT and LX of the first bundle water-repellent composition containing ethyl silicate ETS-40 10%concentration in the gas condensate in the amount of 1-2 m3for every meter of gas-saturated thickness of the formation is jacking it into the formation and education in the reservoir water shutoff screen, pushing back formation water from the bottom to the depth of the reservoir radius, subsequent injection through the CP of the second stack of water-repellent composition containing ethyl silicate ETS-40 100%concentration of 0.4-0.6 m3for every meter of the effective thickness of the reservoir by pushing it into the reservoir of the condensate in the amount of LC and the interior of the well casing below the Shoe LK, re-descent GT in the interval gasovodnog contact (DDC), injection via GT hydrophobic crasneanscki liquid NGL-11N volume of 0.10-0.15 m3for every meter of aquifer thickness seam, back washing of the wells in a volume of 2.0 loop back pressure, extraction GT from wells and abandonment of wells to react under pressure.

In Fig.1 shows the implementation of this method when cleaning the face from liquids and solids, in Fig.2 - the same when injected into the perforated interval of the first bundle water-repellent composition, Fig.3 is the same when injected into the perforated interval of the second stack water-repellent composition, Fig.4 - the same for downloading in the interval GVK hydrophobic crasneanscki liquid.

The method is implemented as follows.

In a gas well under pressure, into the internal cavity LK 1 gas well down GT 2 to the bottom 3. Conduct of ochikubo 3 from the liquid and solids direct circulation of gas condensate from the gas outlet, located in the well, the torch, fill-in-borehole gas condensate.

Then raise GT 2 to Shoe LUX 1. Into the perforation interval 4 through KP between 5 GT 2 and Luke 1 first bag of water-repellent composition 6 containing ethyl silicate ETS-40 10%concentration, which plays the role of hydrophobic additives in the gas condensate in the amount of 1-2 m3for every meter of gas 7 thickness of the layer 8 by punching him in the gas-saturated part 7 layer 8 buffer pack 9 gas condensate in the amount of 0,2 m3and education in the reservoir 8 waterproofing screen 10, pushing back formation water from the bottom 3 in the depth of the layer 8 on the radius.

Pumped through KP 5 in the perforation interval 4 second pack water-repellent structure 11 containing ethyl silicate ETS-40 100%concentration, which plays the role of the gel, in the amount of 0.4-0.6 m3for every meter effective, including gas 7 and 12 saturated part, the thickness of the layer 8, push it into the reservoir 8 condensate in volume LK 1 and the inner space of the well, its casing, below the Shoe LK 1.

Next GT 2 dopuskayut in the interval GVK 13, the position of which is determined by geophysical methods, and pumped through it hydrophobic kremniiorganicheskie liquid 14 NGL-11N, playing the role of the fixer, about what yeme of 0.10-0.15 m 3for every meter 12 saturated thickness of layer 8 forming upon contact with water saturated portion 12 of the reservoir 8 of the blocking screen 15, preventing the ingress of water to the borehole bottom.

Then hold back washing of the wells in a volume of 2.0 cycle backpressure. GT 2 is extracted from the well and the well is left to react under pressure.

Examples of implementation of the method.

You must also isolate the inflow of formation water in gas wells with abnormally low formation pressure without her killing.

ETS-40 or ethyl silicate - silicon compound containing Catholic supplements organochlorosilanes: tetraethoxysilane and hydrochloric acid (HCl). In the hydrolysis of ethyl silicate gel is formed, and the hydrolysis product clogs the breed. The composition has a high water capacity and selective effects on neftegazonosnye layers.

NGL are products of hydrolysis organochlorines with the subsequent dissolution of the hydrolysis products in water or Vodopyanova alkaline solution (sodium hydroxide).

These compositions can be used in a wide range of reservoir temperatures from zero to 200°C regardless of the degree of water mineralization. Freezing temperature is below minus 40°C.

The content of ETS-40 in the composition of the gas condensate more than 10% naselenia asno because of increasing cost, associated with increased consumption of reagents, with noticeable improvement of technological parameters is not observed.

When the content of the NGL-11N in ETS-40 more than 15% significantly reduces the time of polymerization, which can lead to the impossibility of placing the waterproofing composition into the formation.

When the content of the NGL-11N in ETS-40 less than 5% significantly increases the time of the polymerization process (24-48 h), which is not economically justified when carrying out waterproofing works.

For the backwash of the wells in a volume of less than 2.0 cycles increase the risk of sticking the flexible pipe in the Elevator column, and in the amount of more than 2.0 cycles backwashing is not economically feasible, as it does not lead to a noticeable increase in the effect.

When downloading the first bundle ETS-40 in the amount of less than 1 m3for every meter of gas-saturated thickness of the formation decreases the efficiency of water shutoff, and when the amount is more than 2 m3significantly reduced curing time, which can lead to the impossibility of subsequent injection waterproofing composition into the formation.

When downloading the second pack ETS-40 in the amount of less than 0.4 m3for every meter of the effective thickness of the reservoir, which consists of gas and opened the water-saturated parts of the reservoir, decreasing the effectiveness of the waterproofing works, and if the volume is greater 0.6 m 3significantly reduced curing time, which can lead to the inability injection waterproofing composition into the formation.

When downloading NGL-11N in the amount of less than 0.10 m3for every meter of the effective thickness of the layer decreases the efficiency of the waterproofing work, the amount of more than 0.15 m3significantly reduced curing time, which can lead to the inability injection waterproofing composition into the formation.

Example 1

In a gas well under pressure, depth of 1000 m in the inner cavity LK diameter 168 mm despise GT diameter of 48 mm to slaughter. Carry out cleaning of the face from the liquid and solids. Raise GT to boot LK. Into the perforation interval length 60 m through the CP area 15853,86 mm2the first bundle water-repellent composition containing ETS-40 10%concentration in the gas condensate in the amount of 60 m with the formation of the waterproofing of the screen. Pumped through the CP first gas condensate in the amount of 0,2 m3and after him the second pack water-repellent composition containing ETS-40 100%concentration in a volume of 24 m, push it into the reservoir of the condensate in the amount of LC and the inner space well below LK. Next GT will dopuskayut in the interval GVK and pumped through it hydrophobic kremniiorganicheskie liquid NGL-11N in the amount of 10.0 m 3. Then hold back washing of the wells in a volume of 2.0 cycle with a pressure of 5.0 MPa. GT is extracted from the well and the well is left to react under pressure.

Example # 2

In a gas well under pressure, depth of 1200 m in the inner cavity LK diameter 114 mm despise GT 42 mm in diameter to the bottom. Carry out cleaning of the face from the liquid and solids. Raise GT to boot LK. Into the perforation interval of length 30 m through the CP area 6465,86 mm2the first bundle water-repellent composition containing ETS-40 10%concentration in the gas condensate in the amount of 45 m3with the formation of the waterproofing of the screen. Pumped through the CP first gas condensate, which was followed by a second pack water-repellent composition containing ETS-40 100%concentration in a volume of 15 m3, push it into the reservoir of the condensate in the amount of LC and the inner space well below LK. Next GT will dopuskayut in the interval GVK and pumped through it hydrophobic kremniiorganicheskie liquid NGL-11N in the volume of 12.0 m3. Then hold back washing of the wells in a volume of 2.0 cycle with a pressure of 5.5 MPa. GT is extracted from the well and the well is left to react under pressure.

Example # 3

In a gas well under pressure, depth of 1400 m in the inner cavity is To the diameter of 89 mm despise GT with a diameter of 33 mm to slaughter. Carry out cleaning of the face from the liquid and solids. Raise GT to boot LK. Into the perforation interval length of 10 m through the CP area 3921,07 mm2the first bundle water-repellent composition containing ETS-40 10%concentration in the gas condensate in the amount of 20 m3with the formation of the waterproofing of the screen. Pumped through the CP first gas condensate, which was followed by a second pack water-repellent composition containing ETS-40 100%concentration in an amount of 6 m3, push it into the reservoir of the condensate in the amount of LC and the inner space well below LK. Next GT will dopuskayut in the interval GVK and pumped through it hydrophobic kremniiorganicheskie liquid NGL-11N in the amount of 15.0 m3. Then hold back washing of the wells in a volume of 2.0 cycle with a pressure of 6.0 MPa. GT is extracted from the well and the well is left to react under pressure.

The proposed method of isolating the flow of formation waters in the wells allows for repair and insulation works without killing the well, reducing the degree of pollution of bottom-hole formation zone, save gas saturated thickness of the layer, to reduce the duration of repair work 5-6 times, reduce costs, and the cost of repairs well in 3-4 times.

The way to isolate the flow of formation waters, including the trigge the flexible pipe into the inner cavity of the tubing string of a gas well to the bottom and cleaning of the face from the liquid and solids, filling gas condensate wells, the subsequent rise of flexible pipe to the Shoe tubing string, the injection into the perforation interval through the annular space between tubing and tubing-casing the first bundle water-repellent composition containing ethyl silicate ETS-40 10%concentration in the gas condensate in the amount of 1-2 m3for every meter of gas-saturated formation thickness by punching him in the formation and education in the reservoir water shutoff screen, pushing back formation water from the bottom to the depth of the reservoir radius, subsequent injection of specified through the annular space of the second stack of water-repellent composition containing ethyl silicate ETS-40 100%concentration of 0.4-0.6 m3for every meter of the effective thickness of the reservoir by pushing it into the reservoir of the condensate in the volume of the tubing string and the interior of the well casing below the Shoe tubing string, a second descent of the flexible pipe in the interval gasovodnog contact, injection through a flexible pipe hydrophobic organosilicon liquid NGL-11N volume of 0.10-0.15 m3for every meter of saturated thickness of the formation, the back washing of the wells in a volume of 2 cycle pressure, removing the flexible pipe from the well and abandonment of wells to react under pressure.


 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: according to the method the well is killed, the sand plug is washed and hydraulic fracturing of the formation is made with its simultaneous setting within the whole perforation interval. Volume of the well bottomhole zone within the perforation interval is divided into two production facilities by injecting and flushing of waterproofing compound to the formation depth radially thus forming water shutoff screen. Time is withheld for hardening of the waterproofing compound. The well volume at the water shutoff screen level is divided into two production zones by setting a packer run in with the tubing string. The tubing string is equipped with a gas lift valve in the upper part of the upper facility perforation interval. The string shoe is set at the level of 1.5-2m below the lower openings in the lower facility perforation interval and water extraction is made by intrawell gaslift from the lower production facility due to gas energy from the upper production facility.

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18 cl, 6 dwg

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10 cl, 6 dwg

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2 cl, 4 dwg, 1 tbl

FIELD: oil and gas industry.

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FIELD: oil-and-gas industry.

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1 ex

FIELD: oil and gas industry.

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6 dwg

FIELD: oil and gas industry.

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6 dwg

FIELD: oil and gas production.

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EFFECT: enabled formation water inflow insulation without killing of well and restricted pollution of water-inflow part of formation.

3 cl, 1 dwg

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EFFECT: higher efficiency.

1 ex

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2 tbl, 2 ex

FIELD: oil and gas production.

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EFFECT: increased insulation capacity of grouting compositions.

1 tbl

FIELD: oil extractive industry.

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EFFECT: higher efficiency.

2 tbl

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping, in carrying liquid - waterless mixture of oil products containing waterless oil, of powder-like water-soluble polymer and connector in amount of 0.05-0.2% for mass of carrying liquid or 30-100% for mass of power-like water-soluble polymer, as said mixture a mixture of waterless oil and light oil products processed in relation 0.1:9.9-9.9:0.1 is used, and as connector - dry aluminum acetate, chrome acetate, iron acetate, magnesium acetate, copper acetate, barium acetate, manganese acetate, calcium acetate or their mixtures.

EFFECT: higher efficiency.

1 tbl

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping, in carrying liquid - waterless mixture of oil products containing waterless oil, of powder-like water-soluble polymer and connector in amount of 0.05-0.2% for mass of carrying liquid or 30-100% for mass of power-like water-soluble polymer, as said mixture a mixture of waterless oil and light oil products processed in relation 0.1:9.9-9.9:0.1 is used, and as connector - dry aluminum sulfate, chrome sulfate, iron sulfate, magnesium sulfate, copper sulfate or their mixtures, or their alums with common formula MIMIII(SO4)

.2
12H2O, where MI-Na,K,Pb,Cs,NH4, and MIII-Al,Cr,Fe,Mn.

EFFECT: higher efficiency.

2 tbl

FIELD: oil and gas extractive industry.

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EFFECT: higher efficiency.

7 cl, 1 ex

FIELD: oil industry.

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EFFECT: higher efficiency.

8 ex, 2 tbl

FIELD: oil and gas industry.

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EFFECT: higher precision.

2 cl, 2 dwg, 1 ex, 1 tbl

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