Method for isolation of reservoir water inflow in well with buckled flow string under conditions of abnormally low reservoir pressures

FIELD: oil and gas production.

SUBSTANCE: sand plug is washed down to lower perforation holes of existing interval of perforation, and buckling of flow string is eliminated. Then water-insulation composition is injected into existing interval of perforation, is pushed into reservoir, creating a water-insulation screen, and displacing reservoir water in depth of reservoir by displacement fluid. Then tail of smaller diametre pipes is lowered in inner cavity of flow string to head of washed sand plug, with arrangement of tail head by 20 m higher than reservoir roof, which is cemented by mortar, leaving cement sleeve in inner cavity of tail down to depth of 1-2 m higher than current gas-water contact and higher than upper holes of existing perforation interval. As cement hardening waiting time elapses, two strings, tail and operating strings are perforated for operation, in interval above the cement sleeve to roof of reservoir. Then lifting string is lowered in well by 1-2 m higher than the tail head. Gas flow is caused from reservoir, and well is flared. Gas dynamics research is carried out, and the well is commissioned. At the same time water-insulation composition is represented by liquid glass, displacement fluid - by methanol, cement mortar is a composition that consists of portland cement, superplasticiser C-3, polyvinyl alcohol and polypropylene fibre.

EFFECT: liquidation of reservoir water inflow and elimination of flow string buckling conditions, provision of water-free operation of wells and getting planned volumes of gas production.

1 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 with rumpled column operating under conditions of abnormally low formation pressure.

At fields in Western Siberia there are a large number of oil and gas deposits with complex built by the collectors, which are interleaved between the layers of different permeability. Thus the thickness of these deposits are often small, which forces to carry out their secondary opening in the high-permeability gas-saturated part of the reservoir, leaving less permeable part is not opened, the perforated production casing had to be a continuous interval and double density.

At the final stage of development of such deposits a large number of wells out of operation due to lower reservoir pressure, flooding and collapse of the lower part of the casing in the perforation interval. This is due to the emergence of a large difference between mountain and bottomhole pressures as extraction of hydrocarbon deposits, i.e. pressure rocks and the pressure in the well and the reservoir.

In these conditions, traditional methods to eliminate the flow of formation waters, restore productivity and output hole of estaste difficult. To eliminate the inflow of formation water without eliminating crumples the production string is not possible, and to eliminate its crushing installing insulation packers or longitudinally corrugated patches because of the continuous perforating the production casing and lowered for this reason her strength to carry out technically impossible.

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 keeping well in the setting time of cement slurry [Reference book on current and capital repair of wells. / Ademero and others - M.: Nedra, 1979. - S-241].

The disadvantage of this method under conditions of abnormally low formation pressure, in the presence of the rumpled surface casing is the lack of reliability isolate the flow of formation waters, resulting after perforation in obwodnica productive part of the reservoir formation water again begins to flow into the well, Obvodny new perforation interval.

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 keeping well in the setting time of cement slurry [RF Patent №2127807, E21B 43/32].

The disadvantage of this method under conditions of abnormally low formation on the areas in the presence of the rumpled surface casing is the lack of reliability isolate the flow of formation waters, after a perforation in obwodnica productive part of the reservoir formation water again begins to flow into the well, Obvodny new perforation interval.

The challenge when creating the invention is to improve the reliability of the isolation of the inflow of formation water and increase water-free period of operation of the well when the integrity of the production string.

Achievable technical result, which is obtained by the invention, is to eliminate the flow of formation waters and elimination of conditions of the collapse of the production string, in providing waterless operation of wells and the receipt of scheduled quantities of gas production.

The task and the technical result is achieved by the fact that while isolating the flow of formation waters in the well with the rumpled column operating under conditions of abnormally low formation pressure at which washed sand tube to the bottom of the existing holes of the perforated interval, eliminate wrinkling of the production string, into an existing perforation interval waterproofing composition, push waterproofing composition in the reservoir with the creation of the waterproofing of the screen, pushing back the produced water in the depth of the productive formation and squeezing the fluid into the internal cavity e is sploitation column head to washed sand tube down the shank of the pipe of smaller diameter with the head of the shank 20 m above the roof of the reservoir, cement shank cement mortar, leaving cement and glass in the inner cavity of the shank to a depth of 1-2 m above the current gas contact and above the bottom of the existing holes of the perforation interval, after a waiting period of solidification of the cement are perforated under the operation of two columns, shank and production casing in the interval above the cement and glass up to the roof of the reservoir into the well down Elevator column at 1-2 m above the head of the shank, carry out the call flow of gas from the reservoir and the working out well at the torch, hold the gas-dynamic researches and enter the well in operation, when as a waterproofing composition used liquid glass as squeezing liquid - methanol as a cement composition containing Portland cement, superplasticizer C-3, polyvinyl alcohol and polypropylene fiber.

Figure 1 shows the structure of a well-to repair, figure 2 - the scheme of realization of the proposed method when washing the sand tube and water shut-off, figure 3 is the same during the descent of the shank, figure 4 is the same in the process of perforation under operation and putting the well into operation.

The method is implemented in the watered well in conditions of abnormally low formation pressure (figure 1), is where the perforation is opened lower, the most permeable, gas-saturated thickness of the productive stratum 1, in which the existing perforation interval 2 completely blocked by sand tube 3, the current gas-contact 4 has risen above the lower holes of the existing perforation interval 2, and its water cone 5, podtyagivayetsa to the bottom of the wells, rose above the top of the existing holes of the perforated interval 2. At the same time operating the column 6 perforated uniformly continuous interval and double density, and its lower part was prokontrolirovali and possible leaks or damp due to the large difference of the mountain and downhole pressures, i.e. the pressure of the rocks and the pressure in the well and the reservoir. Lowered into the well, into the inner cavity of the casing 6, Elevator column 7 also covered with sand tube 3 and is in a stuck condition.

Initially in the well (figure 2) washed sand tube 3 to the lower holes of the existing perforation interval 2 and eliminate crushing production casing 6. Extracted from wells Elevator column 7.

Then upload to an existing perforation interval 2 through lowered into the well of wash pipe 8 waterproofing composition 9, pushes her into the reservoir 1 and squeezing the liquid 10 with the creation of waterproofing screen 11, o is handled outside of the water cone 5, and displacing the produced water in the depth of the productive layer 1. The waterproofing composition 9 use liquid glass, and as squeezing liquid 10 - methanol. After completion of the injection and punching waterproofing composition 9 from the well remove the wash pipe 8.

Next (figure 3) in the internal cavity of the casing 6 to the head 12 washed sand tube 3 down the shank 13 of the pipes of smaller diameter with the head 14 of the shank 13 to 20 m above the roof 15 of the productive layer 1. The shank 13 is lowered into the inner cavity of the casing 6 to prevent further collapse of the production casing 6 due to the large difference of the mountain and downhole pressure conditions of abnormally low formation pressure. Cement shank 13 cement mortar 16, leaving cement and glass 17 in the inner cavity of the shank 13 to the depth of 1-2 m above the current gas-contact 4. Moreover, to prevent absorption of cement 16 in conditions of abnormally low formation pressure and get solid cement applied composition containing Portland cement, superplasticizer C-3, polyvinyl alcohol and polypropylene fiber. As a Portland cement can be used Portland cement PTC 1-50 or PTC 1-100, cachestoreprivate alcohol - polyvinyl alcohol PVA 18/11 or PVS VN, and as polypropylene fibers can be used polypropylene fiber called "fiber" or inert fibrous filler.

After a waiting period of hardening cement (figure 4) carry out the perforation under operation 18 two columns, the shank 13 and the casing 6 above cement and glass 17 to the roof 15 of the productive layer 1. The perforation can be cumulative punches high power, for example PJ 2906 "omega" or SPKT 73-SE, the PCB 80, the GOK 42S.

Then in the hole down Elevator column 7 at 1-2 m above the head 14 of the shank 13.

Possible descent into the well tubing string 7 diameter less than the diameter of the shank 13 to the upper holes of the perforated interval under operation 18.

Perform the call flow of gas from the reservoir 1 and the testing of wells on the torch, hold the gas-dynamic researches and enter the well into operation.

An example implementation of the method in well No. 218 vyngapurovskogo field.

Initially in the well using coiled tubing installation washed sand tube to the bottom of the existing holes of the perforated interval. ProcNum tool has eliminated the collapse of the production string. Drew Elevator column.

After that, in the existing interval PE is the perforation eld is well expressed pumped liquid glass as a waterproofing composition in the amount of 120 m 3and pushed it into the reservoir methanol based creation waterproofing screen outside of the water cone. While the produced water was pushed into the depth of the reservoir.

Further, in the inner cavity of the casing head to the washed sand tube pulled the shank of the tubing 114 mm in diameter with the head of the shank 20 m above the roof of the reservoir, ensure the prevention of further collapse of the production string because of the large difference of the mountain and downhole pressure conditions of abnormally low formation pressure reservoir.

The liner was cemented with cement mortar containing Portland cement PTC 1-50, superplasticizer C-3, polyvinyl alcohol varieties 18/11 and polypropylene fiber "fiber", in volume 35 m3. Moreover, the cement behind the shank between the shank and the production column, raised to the head of the shank and the inside of the shank has left cement glass to a depth of 2 m above the current gas contact. Thus, the cement bridge and reinforced shank and blocked the entire reservoir. The reliability of the isolation of the produced water is provided by displacement of formation water beyond the water cone, creating a waterproofing screen and cement bridge over the shank. the reliability is ensured by the composition of the cement.

After a waiting period of hardening of cement made the perforation under the operation of two columns, the shank and the casing above the cement and glass up to the roof of the reservoir. Perforation spent a cumulative perforator increased power PJ 2906 "omega".

Then in the well was lowered lifting column with a diameter of 114 mm at 2 m above the head of the shank to ensure the ability to conduct repairs coiled tubing installation.

Held the call flow of gas from the reservoir through a coiled tubing unit and has worked well on the torch to its exit on the technological regime. After working well and holding the gas-dynamic researches the well was put into operation.

The inventive method provides reliable insulation of the reservoir, eliminates the inflow into the well formation water, podtyagivayutsya to the bottom of the borehole in the form of a water cone, prevents further collapse of the production casing, extends the period of anhydrous well operation, contributes to obtaining project gas production volumes.

The way to isolate the flow of formation waters in the well with the rumpled column operating under conditions of abnormally low formation pressure at which washed sand tube to the bottom of the existing holes of the perforation interval, eliminate see the enterprise of the production string, upload an existing perforation interval waterproofing composition, push waterproofing composition in the reservoir with the creation of the waterproofing of the screen, pushing back the produced water in the depth of the productive formation and squeezing the liquid into the inner cavity of the casing head to the washed sand tube down the shank of the pipe of smaller diameter with the head of the shank 20 m above the roof of the reservoir, cement shank cement mortar, leaving cement and glass in the inner cavity of the shank to a depth of 1-2 m above the current gas contact and above the bottom of the existing holes of the perforation interval, after a waiting period of solidification of the cement are perforated under the operation of two columns, shank and production casing in the interval above the cement and glass to roof deducting a reservoir down Elevator column at 1-2 m above the head of the shank, carry out the call flow of gas from the reservoir and the working out well at the torch, hold the gas-dynamic researches and enter the well in operation, when as a waterproofing composition apply liquid glass as squeezing liquid - methanol as a cement - composition, provided the Portland cement, superplasticizer C-3, polyvinyl alcohol and polypropylene fiber.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: in well operation method involving pumping of composite material to the formation to the interval below oil-water contact, process exposure and operation of the well, there preliminarily performed is forcing of water from inter-tube space with oil to the interval below oil-water contact; in order to prepare composite material the thickener is filled to inter-tube space of the well on the basis of 1-5 kg per 1 m3 of oil located in inter-tube space, and mixing of thickener with oil in inter-tube space by oil circulation with thickener via tubing string and inter-tube space, and pumping of solution of oil and thickener from inter-tube space to the interval below oil-water contact is performed in pulse mode under pressure exceeding hydrostatic one by not more than 10%; at that after process exposure the well operation is performed during the first 5-15 days in moderate mode with flow rate of not more than 50% of the operating one.

EFFECT: reducing associated water production.

1 ex, 1 dwg

FIELD: oil and gas industry.

SUBSTANCE: method involves use of the well and flow column lowered to it, pumping to productive formation of liquid or liquid-gas mixture prepared by using the mixing device the discharge of which is interconnected with flow column, and low and high pressure chambers - with gas and/or liquid sources. According to invention, the pumping of liquid or liquid-gas mixture is performed periodically to the watered-out interval of productive formation. On bottom hole of the well, in annular space between flow column and casing string in the interval above and within the limits of the watered-out part of productive formation there installed are not less than two packers. Annular space in the packer installation interval is filled with non-newtonian fluid. Two circulation valves are installed in flow column. One is installed in watered-out interval of the formation, and the other one - above the upper packer.

EFFECT: increasing operating efficiency of wells at hydrocarbon deposits, the operation of which is complicated with water penetration into deposits.

5 cl, 1 dwg

FIELD: oil-and-gas production.

SUBSTANCE: it is implemented preparation of injection well in insulated area by path close to roof cladding configuration of insulated area of stratum. Then it is pumped into it solution of foam maker with following feeding of gas for foaming. It is defined minimal horizontal lateral dimension of screen from conditions of filtration through the screen of gas and/ or water considering pressure gradient at the boundaries of screen at the period equal to period maximal pumping into gas storage or maximal permissible withdrawal of gas from particular storage. Minimal vertical dimension if screen is considered equal to value which is not less than maximal dimension from roof of formation up to gas-water contact in the area of screen creation. In preference it is implemented injection well making, path of which is normal to vector of average speed of formation fluid in isolated area of stratum. Preferentially it is also implemented making of inclined and/or horizontal injection well.

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3 cl, 3 tbl, 1 ex, 3 dwg

FIELD: oil-and-gas industry.

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2 cl, 1 tbl, 24 ex

FIELD: oil-and-gas industry.

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1 ex

FIELD: oil-and-gas industry.

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EFFECT: well efficiency recovery and stand by wells operation start up reliability increase.

1 ex, 4 dwg

FIELD: oil-and-gas production.

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2 tbl

FIELD: oil and gas production.

SUBSTANCE: invention is related to gas production industry, in particular to methods for isolation of bottom water influx in gas wells. In method for isolation of bottom water influx in gas wells, including lowering of oil well tubing (OWT), pumping of blocking polymer compound with previously identified value of structural viscosity in annular space, cement isolating substance along OWT, their pushing through with process fluid, lowering of OWT is done down water entry bed, additionally prior to pumping of blocking polymer compound, a low-viscous gel-forming compound is supplied into annular space, which contains the following components, wt %: sodium silicate of "Sialit 30-50" grade 50, liquid waste from process of electrochemical metal coating 0.8, water - the rest, adding the latter to water entry bed, and blocking polymer compound is added to gas-bearing bed, then they are pushed through by pumping of process fluid along OWT with annular space closed, blocking polymer compound is used with a value of structural viscosity that exceeds at least thrice value of structural viscosity of low-viscous gel-forming compound, for headers with high permeability they use polymer compound as blocking polymer compound with organic filler, containing the following components, wt %: lignosulphonate 5, calcium chloride 15, gas condensate 20, peat-alkaline filler 7, technical water - the rest, and for headers with low permeability - polymer compound with condensed solid phase, which contains the following components, wt %: calcium chloride 9, twice-substituted ammonium phosphate 11, water-soluble polymer 2, surfactant 1, technical water - the rest, at the same time volume of blocking compound is defined according to given calculation formula, and pumping of cement isolation compound along OWT is done in volume that exceeds volume of operational pipe in interval of water entry bed by 20%, at the same time pushing of cement isolation compound is started to be done with annular space open, and after it reaches bottom of gas bearing bed, it is pushed with annular space closed with pressure that exceeds pressure of absorption.

EFFECT: development of efficient method for isolation of bottom water influx in gas wells.

2 ex, 2 tbl

FIELD: oil and gas production.

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1 ex, 4 dwg

FIELD: oil-and-gas production.

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2 cl, 4 tbl, 4 ex

FIELD: oil and gas production.

SUBSTANCE: invention relates to insulating formation water inflow in gas and gas condensate wells with the aid of coltubing techniques. In particular, flexible conduit is descended through the tube space of well operated under pressure to the bottom with the aid of coltubing installation. Latches on tube and annulus spaces are opened. Well hole is filled through flexible conduit with gas condensate. Grouting mortar is prepared in preparation block by mixing cement mortar with setting retardant and mortar flowability enhancer in a calculated amount needed to prevent formation water inflow. Further, flushing fluid, e.g. methanol, is pumped through flexible conduit in amount constituting 0.3-0.6 volume of flexible conduit. Annulus space is closed and grouting mortar is pumped through flexible conduit in amount required to fill well hole in interval of water-inflow part of formation. When grouting mortar in hole rises to specified height, tube space is closed and grouting mortar contained in flexible conduit is forced into water-inflow part of formation by in series pumped flushing fluid and displacing solution: for example first methanol in amount 1.0-1.3 volumes of flexible conduit and then gas condensate in required amount, which however does not exceed internal volume of flexible conduit, until grouting mortar begins being pumped in amount of 0.3-0.5 volumes of flexible conduit. Then tube and annulus spaces of well are opened and gas condensate begins being simultaneously pumped into tube and annulus spaces in order to prevent rise of grouting mortar therein above interval of the water-inflow part of formation. Thereafter, bottom of flexible conduit is raised by 1 m above indicated interval and excess of grouting mortar is cut and washed away with gas condensate passed through flexible conduit into tube space, where excess grouting mortar remains in fluid state. After cement setting expectation time, flexible conduit is descended to the top of cement column and tests the latter for strength applying 4.0-5.0 kN loading by means of injector of coltubing installation through flexible conduit. Finally, cement bridging is subjected to hydraulic pressurization and flexible conduit is removed from well.

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

3 cl, 1 dwg

FIELD: oil and gas chambers construction.

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EFFECT: higher efficiency.

1 ex

FIELD: oil and gas production.

SUBSTANCE: bottom area of formation is treated with hydrophobic agent, in particular solution of ethylene/vinyl acetate copolymer expressed by general formula [-CH2-CH2-C(CH3COO)H-CH2-]n, where n=7000-10000, in hydrocarbon solvent.

EFFECT: increased source of inexpensive hydrophobic agents with improved adhesion properties, intensified oil recovery due to increased depth of penetration of hydrophobic agent into formation, improved environmental conditions in development of oil formations, and reduced oil production expenses.

2 tbl, 2 ex

FIELD: oil and gas production.

SUBSTANCE: composition is made up of 90.0-95.0% sodium silicate solution with concentration 1.36 g/cm3 and silica modulus 3.0, 3.0-8.0% alkali metal silicofluoride, 1.0-4.0% wood flour, and 1.0-4.0% triacetine. Composition can be used during repair operations on oil production stings, when disabling formations, and when confining water inflow.

EFFECT: increased insulation capacity of grouting compositions.

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 nitrate, chrome nitrate, iron nitrate, magnesium nitrate, barium nitrate, calcium nitrate or their mixtures.

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.

SUBSTANCE: method includes forming a screen of viscous-elastic mass in well via interaction of working liquid pumped into well in form of alkali waste of kaprolaktam production or its solution, with influx liquid. Necessary speed of transformation of viscous-elastic mass and intensiveness of filling of well adjacent area with it is adjusted by mode of pressing of working liquid into influx zone. For this purpose pressure increase is alternated with pressure decrease. Pressure is decreased for 10-50% from achieved maximum pressure. Relation of exposure time for increased pressure to decreased pressure time is taken in limits 1.1-5.0.

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.

SUBSTANCE: method includes adjustment of pumping and dosing equipment on basis of amounts of components and their feeding time. Multi-component technological system is forced into well. Adjustment of pumping and dosing equipment is performed by means of frequency converters. Frequencies, set at frequency converter of forcing pump electric engine, at frequency converter of linker-feeding pump electric engine and at frequency converter of powdered polyacrylamide dosing pump electric engine are determined from mathematical formulae. Plant has drift dosage means for powdered polyacrylamide, drift dosage means for powdered components, two ejector mixers, mixing tank, forcing pump, linker tank. Electric engines of forcing pump, linker pump, first and second drift dosage devices are provided with frequency converters. First and second ejector mixers are provided with replaceable nozzles, with diameter 4.5-8.0 mm to provide for 150-250 m3/day plant productiveness.

EFFECT: higher precision.

2 cl, 2 dwg, 1 ex, 1 tbl

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