RU2495237C1 - Method of bitumen deposit development - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: method of bitumen deposit development includes construction of double-mouth top and bottom well with horizontal areas which are equipped with stacked filters with holes; run-in operation of pipe strings with pumps in order to extract heated bitumen; heating of productive stratum by steam injection to both wells; heating of cross-hole area of stratum; reduction of bitumen viscosity, reading of thermograms from heat-sensing devices located at horizontal areas of wells, analysis of stratum condition regarding its heating and equal heating of stratum considering the obtained thermograms. Filters of horizontal areas of top and bottom double-mouth wells are divided into extraction areas. Inside filters, opposite each extraction area liners with holes are installed; the liners are at ends of pipe stings from mouths of double-mouth wells. Liners are connected rigidly with respective pipe strings and holes of filters can be either open or closed hermetically at horizontal areas of double-mouth wells. Tubing-casing annulus of the top and bottom double-mouth wells is interconnected from one mouth. Tubing-casing annulus of the top and bottom double-mouth wells is connected from the other mouth with steam generator. With closed holes of filters at horizontal areas of double-mouth wells, heating of crosshole area of stratum and areas located higher and lower than horizontal areas of double-mouth wells is made; bitumen viscosity is reduced by closed steam circulation simultaneously through tubing-casing annulus of the top and bottom double-mouth by means of steam generator without steam injection into stratum. When temperature of 85-95°C is reached against data of thermograms taken heat-sensing devices in sampling areas of double-mouth wells steam generator is switched off, steam circulation is stopped, holes of filters are open by their alignment with holes of liners and extraction of bitumen is started simultaneously from the top and bottom double-mouth wells through pipe strings by means of pumps. When temperature of 35-45°C is reached against data of thermograms taken by heat-sensitive devices pumps are switched off, holes of filters are closed hermetically by means of their misalignment with holes of liners; steam generator is switched on and the whole process of crosshole area heating and reduction of bitumen viscosity by closed steam circulation is resumed through tubing-casing annulus of the top and bottom double-mouth wells.

EFFECT: excluding water cut of extracted bitumen and reduction of costs for heating medium due to heating without injection of heating medium into a stratum, potential development of bitumen deposits with thickness of 5-7 m, even working of bitumen deposit.

5 dwg

Description

The invention relates to the oil industry and may find application in the development of bitumen deposits.

A known method of developing an oil field (patent RU No. 2211318, IPC E21B 43/24, published in Bulletin No. 24 of 08/27/2003), including drilling a continuous (double-well) well with the formation of its output section upward with an inclination from the reservoir to the day surface, installing a casing in a drilled well, cementing the annulus along the entire length, perforating the casing in the horizontal section, installing tubing with centralizers inside the casing, supplying coolant to lonne tubing to the inlet and outlet sections, the selection of the product at the outlet portion in the continuation of the coolant injection inlet portion.

The disadvantage of this method is the lack of efficiency of oil recovery, because when steam is injected and oil is taken from one well at the same time, quick steam breakouts occur, and during cyclic exposure, the steam is unproductive for re-heating the cooled reservoir during the selection period, i.e. high energy consumption.

Also known is a method of developing a heavy oil or bitumen deposit using double-well horizontal wells (patent RU No. 2431745, IPC E21B 43/24, published in Bulletin No. 29 of 10/20/2011), including the construction of double-well horizontal wells, pumping coolant through the top is the injection well with heating the reservoir and creating a steam chamber, and the selection of products through the bottom is the production well, taking a thermogram of the steam chamber, analyzing the state of its heating for uniformity of heating and the presence of temperature peaks, and taking into account the obtained thermograms, the steam chamber is uniformly heated, and above the injection well at a distance that excludes the breakthrough of the coolant, a technological double-well well is built, and thermograms of the steam chamber are taken according to thermal sensors that are placed in the technological and producing double-well horizontal wells, while the sides of both mouths of the production well conduct geophysical studies to control the uniformity of heating of the steam chamber, and in the process of developing a heavy oil or bitumen deposit, periodic sampling of products from both mouths of the control well is carried out to assess the mineralization of the water in the samples, based on the mineralization of this water, compare it with the presence of temperature peaks in the thermograms of the steam chamber, after which the filtration directions are changed and / or modes of coolant injection and product selection to equalize the temperature in the steam chamber, and a two-well technological well, if necessary, can use as a production well.

The disadvantages of this method are the high cost of the coolant, since the coolant is injected directly into the reservoir, as well as its limited use in bitumen deposits with small thicknesses (up to 5 meters), since the minimum distance between horizontal trunks of double-well wells should be at least 5-7 m, depending on the heterogeneity of the reservoir properties of the reservoir in order to exclude direct breakthrough of the coolant from the barrel of the dual wellhead producing into the barrel wells.

Also known is a method of developing a heavy oil or bitumen deposit using double-mouth horizontal wells (patent RU No. 2410534, IPC E21B 43/24, E21B 43/08, published in Bulletin No. 3 of January 27, 2011), including the construction of a double-mouth upper injection and lower production wells with horizontal sections located one above the other, pumping coolant through the injection well with formation heating by creating a steam chamber and taking products through the production well with a decrease in production in areas of temperature peaks, o there is uniform heating of the steam chamber, and during the construction of wells, the horizontal section of the producing well is equipped with filter sections with reduced throughput in sections, depending on the breakthrough of the coolant.

The disadvantages of this method are the high cost of the coolant, since the coolant is injected directly into the reservoir, as well as its limited use in bitumen deposits with small thickness formations (up to 5 meters), since the minimum distance between horizontal trunks of double-well wells should be at least 5-7 m, depending on the heterogeneity of the reservoir properties of the reservoir in order to exclude direct breakthrough of the coolant from the barrel of the dual wellhead producing into the barrel wells.

Also known is a method of developing a heavy oil or bitumen deposit using double-well horizontal wells (patent RU No. 2431746, IPC E21B 43/24, published in Bulletin No. 29 of 10/20/2011), including the construction of a double-well upper injection and lower production wells with horizontal sections located one above the other, injection of a heat carrier, for example, superheated steam through an injection well with heating the formation by creating a steam chamber and selection of products through the production well, while using Superheated steam mixed with combustion products of combustible fuel is used, which is pumped through one mouth of the injection column, and moisture is condensed on the inner surface of the injection column through the other mouth, and if reservoir properties deteriorate and / or the total formation production is reduced more than two times for a period of not more than three months, one of the mouths of the producing well is sealed, and an oil-emulsion emulsion is pumped through the other mouth after technological exposure akachku coolant and product selection is performed in the normal mode.

The disadvantages of this method are the high cost of the coolant, since the coolant is injected directly into the reservoir, as well as its limited use in bitumen deposits with small thicknesses (up to 5 meters), since the minimum distance between horizontal trunks of double-well wells should be at least 5-7 m, depending on the heterogeneity of the reservoir properties of the reservoir in order to exclude direct breakthrough of the coolant from the barrel of the dual wellhead producing into the barrel wells.

The closest in technical essence is the method of developing a heavy oil or bitumen field using double-well horizontal wells (patent RU No. 2340768, IPC E21B 43/24, published in Bulletin No. 32 of December 10, 2008), including pumping the coolant through a filter of a dual-mouth horizontal injection well, heating of the producing formation with the creation of a steam chamber and the descent of technological pipe strings with pumps and selection of heated bitumen through the filter of the dual-mouth horizontal producing well, heating of the producing formation they start by injecting steam into both wells, warming the inter-well zone of the formation, reducing the viscosity of oil or bitumen, and creating a steam chamber by pumping coolant with the possibility of piercing the latter to the upper part of the reservoir and increasing the size of the steam chamber during production selection, in which thermograms of the steam are taken chambers using temperature sensors located in horizontal sections of the wells analyze the state of its heating for uniform heating and the presence of temperature peaks, and taking into account the obtained mograms carry out uniform heating of the steam chamber by changing the direction of filtration and / or the modes of pumping the coolant and product selection, while the volume of pumping the coolant through the mouth of the injection well and / or the selection of products through the mouth of the producing well is changed in the ratio,%: (10-90): (90-10).

The disadvantages of this method are:

- firstly, the minimum distance between the horizontal shafts of double-well wells should be at least 5-7 m, depending on the heterogeneity of the reservoir properties of the formation in order to exclude direct breakthrough of the coolant from the barrel of the producing double-well well that limits the application of this method in heavy oil or bitumen deposits, where the thickness of the formation is 5-7 m;

- secondly, the implementation of the method is based on the creation of a steam chamber, for which it is necessary to pump the coolant directly into the reservoir, and this can lead to a breakthrough of the coolant in the wellbore of the producing well and an increase in water cut of the produced product, which reduces the efficiency of its implementation. In addition, this causes the need for waterproofing, and this requires additional financial and material costs for the implementation of the method;

- thirdly, the steam turns into condensate, which contributes to the rapid watering of the bitumen deposit, in connection with which the uniformity of production of the heavy oil or bitumen deposit is violated and the time for their development is reduced, while part of the bitumen remains undeveloped;

- fourthly, the process of pumping the coolant into the injection well is carried out continuously, which increases the cost of the coolant;

- fifthly, a small area of coverage of a heavy oil or bitumen field by thermal exposure, since the heating of heavy oil or bitumen in the formation occurs in the area of the upper double mouth well.

The technical objectives of the proposal are to develop a bitumen deposit by heating it without pumping a heat carrier (steam) into a layer of a bitumen deposit, eliminating the water content of the selected heated bitumen, reduce the cost of the heat transfer fluid, and also implement the method in bitumen deposits represented by strata up to 5-7 meters thick and increase thermal exposure area of a bitumen deposit with uniform production of a bitumen deposit.

The stated technical problem is solved by the method of developing a bitumen deposit, including the construction of a double-wellhead upper and lower wells with horizontal sections equipped with filters with holes located one above the other, descent of pipe process columns with pumps for selecting heated bitumen, heating the reservoir by injecting steam into both wells, heating the inter-well zone of the formation, lowering the viscosity of bitumen, taking thermograms from temperature sensors located in horizontal sections of the wells, analysis of Nia formation on the uniformity of the warm-up and implementation of uniform heating of the reservoir based on the received thermal images.

New is that the filters of the horizontal sections of the upper and lower double-well wells are divided into sampling zones, shafts with holes are installed inside the filters opposite each of the sampling zones, which are lowered at the ends of the pipe process pipes from the mouths of the double-well wells, and the shanks are rigidly connected to the corresponding technological columns pipes with the ability to tightly close or open the filter openings of the horizontal sections of double-well wells, tie annular cross-sections from one mouth the upper and lower double-well boreholes are interconnected, tie the annular space of the upper and lower double-well boreholes with a steam generator from another mouth, with closed filter openings of horizontal sections of double-well boreholes, the inter-wellbore zone of the formation, as well as the formation zones above and below horizontal sections of double-well boreholes, are reduced viscosity of bitumen by closed steam circulation simultaneously along the annular spaces of the upper and lower two-well wells by means of a steam generator without steam injections into the formation, when the temperature reaches 85-95 ° C according to the thermograms taken from the temperature sensors in the sampling areas of the double-well wells, turn off the steam generator, stop the steam circulation, open the filter openings by combining them with the openings of the shanks and begin to select the heated bitumen simultaneously from the top and the lower double-well wells according to the technological columns of pipes with the help of pumps, when the temperature reaches 35-45 ° C according to the thermograms taken from the temperature sensors in the zones of the selection of double-well wells, turn off the pumps, tightly close the openings of the filters, by separating them with the openings of the shanks, start the steam generator and resume the process of heating the inter-well zone of the formation and reduce the viscosity of bitumen by closed circulation of steam through the annular space of the upper and lower double-well wells.

Figure 1 and 2 schematically shows the proposed method for the development of bitumen deposits.

Figure 3 shows a section aa.

Figure 4 shows a section bB.

Figure 5 shows a section bb.

The proposed method is as follows.

First, the construction of the upper double-wellhead 1 is carried out (see Fig. 1), then, for example, at a distance of 4 m, the construction of the lower double-well 2 with horizontal sections 3 and 4 is carried out. The horizontal sections 3 and 4 of the double-well wells 1 and 2 are equipped with filters 5 and 6 with holes 6 ', respectively, located one above the other and opening the formation 7 with bitumen.

и $$L^1{}_2$$

, а также $$L^2{}_1$$

и $$L^2{}_2$$

, например, длиной по 100 м каждая зона отбора.Filters 5 and 6 of the two-well wells 1 and 2 are divided into two extraction zones each: $$L^{\mathrm{one}}{}_{\mathrm{one}}$$

and $$L^{\mathrm{one}}{}_2$$

, as well as $${\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="00000018.png"\; state="\{\{state\}\}">L</figure-callout>}}^2{}_{\mathrm{one}}$$

and $${\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="00000018.png"\; state="\{\{state\}\}">L</figure-callout>}}^2{}_2$$

for example, 100 m long each sampling zone.

и $$L^1{}_2$$

устанавливают хвостовики 8 и 8', а внутри фильтра 6 напротив зон отбора $$L^2{}_1$$

и $$L^2{}_2$$

устанавливают хвостовики 9 и 9'.Inside the filters 5 and 6, opposite each of the extraction zones, shanks 8, 8 ', as well as 9 and 9' with holes 8 '' and 9 '', respectively, are installed. Those. inside the filter 5 opposite the selection zones $$L^{\mathrm{one}}{}_{\mathrm{one}}$$

and $$L^{\mathrm{one}}{}_2$$

shanks 8 and 8 'are installed, and inside the filter 6 opposite the selection zones $$L^{}$$$${}^2{}_{\mathrm{one}}$$

and $${\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="00000018.png"\; state="\{\{state\}\}">L</figure-callout>}}^2{}_2$$

set shanks 9 and 9 '.

Shanks 8 and 8 ', as well as 9 and 9' are lowered at the ends of the process columns of the pipes 10 and 10 '; 11 and 11 ', respectively, from both mouths of double-well wells 1 and 2. In the process of lowering the process columns of pipes 10 and 10' and 11 and 11 'they are equipped with pumps 10 ₁ and 10 ₂ ; 11 ₁ and 11 ₂ , respectively.

Shanks 8 and 8 ', as well as 9 and 9' are rigidly connected to the corresponding process columns of pipes 10 and 10 'and 11 and 11' with the possibility of hermetically closing or opening holes 6 '(see Figs. 4 and 5) made in filters 5 and 6 of horizontal sections 3 and 4 (see figure 1) of double-well wells 1 and 2, respectively.

The holes 6 '(see FIGS. 4, 5) in the filters 5 and 6 are made, for example, in the form of through horizontal grooves at an angle of 180 ° to each other around the circumference, with holes 6' of each of the filters 5 and 6 in the upper 1 (see figure 1) and the lower 2 double-well wells in the initial position are closed (see figure 4) with the corresponding shanks 8 and 8 '(see figure 1), as well as 9 and 9'.

Each of the shanks 8 and 8 ', as well as 9 and 9', is equipped with holes 8 '' and 9 '' (see FIGS. 4 and 5), respectively. The holes 8 '' and 9 '' in the shanks 8 and 8 '(see Fig. 1), as well as 9 and 9', are made, for example, in the form of through horizontal grooves at an angle of 180 ° to each other around the circumference.

The intercolumn spaces 14 and 15 (see Fig. 1) are tied from one mouth 13 of the upper 1 and lower 2 double-well wells to each other by means of a pipe 16, and from the other mouth 13 'the intercolumn spaces 14 and 15 of the upper 1 and lower 2 double-well wells are tied with a steam generator 17, through the discharge 18 and the suction 19 lines.

With the openings 6 'of the filters 5 and 6 of the horizontal sections 3 and 4, respectively, of the upper 1 and lower 2 of the two-well wells closed, the inter-well zone 20 of the formation 7, as well as the zones of the formation 7 above the horizontal section 3 and below the horizontal section 4 of the two-well upper 1 and bottom 2 wells respectively.

To do this, using a steam generator 17, injected steam (for example, water vapor heated to a temperature of 230-250 ° C) through the injection line 18 enters the annular space 14 of the upper double-well bore 1 and through the pipe 16 enters the annular space 15 of the lower double-well 2, and then, through the suction line 19, the steam goes back to the steam generator 17. Thus, one cycle of closed circulation of steam is carried out. Closed steam circulation, which is carried out simultaneously through the annular spaces 14 and 15 of the upper 1 and lower 2 double-well wells, is continued, while due to heat transfer, heating and a decrease in the viscosity of bitumen located in the inter-well zone 20 of the formation 7, as well as the zones of the formation 7 above horizontal section 3 and below the horizontal section 4, two-wellhead 1 and 2 lower wells, respectively.

The steam circulation occurs without steam injection into the reservoir, the steam circulates through the annular spaces 14 and 15 and the holes 14 'and 15' (see Figs. 1, 2), made for bypassing the steam in the places of rigid fastening of the corresponding process columns of pipes and shanks when closed holes 6 '(see figure 1) of the filters 5 and 6 of the horizontal sections 3 and 4, respectively, of the upper 1 and lower 2 double-well wells.

и $$L^1{}_2$$

, а также $$L^2{}_1$$

и $$L^2{}_2$$

соответствующих двухустьевым скважинам 1 и 2, при этом пар (теплоноситель) в пласт 7 не попадает, вследствие чего исключаются нежелательные последствия, а именно: образование конденсата, прорыв теплоносителя в ствол при отборе разогретого битума и, как следствие, увеличение обводненности отбираемого разогретого битума, а также водоизоляционные работы.The walls of the well are heated by the circulation of steam in it. The steam generator 17 in the process of closed circulation maintains a steam temperature of 230-250 ° C. The interwell zone 20 of formation 7 is heated by heat transfer directly from the walls of the double-mouth upper 1 and lower 2 wells themselves, as well as through filters 5 and 6 to formation 7, which leads to heating of formation 7 in the selection zones $$L^{\mathrm{one}}{}_{\mathrm{one}}$$

and $$L^{\mathrm{one}}{}_2$$

, as well as $${\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="00000018.png"\; state="\{\{state\}\}">L</figure-callout>}}^2{}_{\mathrm{one}}$$

and $${\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="00000018.png"\; state="\{\{state\}\}">L</figure-callout>}}^2{}_2$$

corresponding to two-well wells 1 and 2, while the vapor (coolant) does not enter the formation 7, as a result of which undesirable consequences are eliminated, namely: condensation, breakthrough of the coolant into the wellbore during the selection of heated bitumen and, as a result, an increase in water cut of the selected heated bitumen, as well as waterproofing works.

In the proposed method, the thermal coverage of the bitumen deposit is increased due to the fact that the coolant (steam) is supplied to both the upper 1 and lower 2 double-well wells, i.e. carry out a closed circulation of steam, while both the inter-well zone and the formation zone are heated above the horizontal section 3 and below the horizontal section 4, and this increases the efficiency of the thermal effect as a whole.

Steam injection by the steam generator 17 occurs at minimum injection pressures (1.5-2 MPa) sufficient to overcome hydraulic resistance during circulation, since steam is not injected into the formation 7 and the injection pressure does not depend on the permeability of the formation of the bitumen deposit.

The coolant costs are reduced due to closed steam circulation through the annular spaces 14 and 15 of the two-wellhead upper 1 and lower 2 wells without steam injection into the formation.

The proposed method can be implemented in a bitumen deposit, represented by strata with a thickness of 0.5 to 5-7 m, since the breakthrough of the coolant in the well selection zones is excluded, since the development of the bitumen deposit is carried out without pumping the coolant into the reservoir.

и $$L^1{}_2$$

, а также $$L^2{}_1$$

и $$L^2{}_2$$

, соответствующих двухустьевым верхней 1 и нижней 2 скважин, что определяют по данным термограмм, снятых с термодатчиков (на фиг.1, 2, 3, 4 не показано), установленных в горизонтальных участках 3 и 4 (см. фиг.1 и 2) двухустьевых скважин 1 и 2 напротив каждой из зон отбора $$L^1{}_1$$

и $$L^1{}_2$$

, a также $$L^2{}_1$$

и $$L^2{}_2$$

.Steam is circulated until a temperature of 85-95 ° C is reached in the extraction zones. $$L^{\mathrm{one}}{}_{\mathrm{one}}$$

and $$L^{\mathrm{one}}{}_2$$

, as well as $${\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="00000018.png"\; state="\{\{state\}\}">L</figure-callout>}}^2{}_{\mathrm{one}}$$

and $${\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="00000018.png"\; state="\{\{state\}\}">L</figure-callout>}}^2{}_2$$

corresponding to the mouth of the upper 1 and lower 2 wells, which is determined by the data of thermograms taken from temperature sensors (not shown in Figs. 1, 2, 3, 4) installed in horizontal sections 3 and 4 (see Figs. 1 and 2) double-well wells 1 and 2 opposite each of the selection zones $$L^{\mathrm{one}}{}_{\mathrm{one}}$$

and $$L^{\mathrm{one}}{}_2$$

, a as well $${\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="00000018.png"\; state="\{\{state\}\}">L</figure-callout>}}^2{}_{\mathrm{one}}$$

and $${\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="00000018.png"\; state="\{\{state\}\}">L</figure-callout>}}^2{}_2$$

.

и $$L^1{}_2$$

, а также $$L^2{}_1$$

и $$L^2{}_2$$

, отключают парогенератор 17, прекращают циркуляцию пара через межколонные пространства 14 и 15 двухустьевых верхней 1 и нижней 2 скважин.Upon reaching a temperature of 85-95 ° C in all sampling zones $$L^{\mathrm{one}}{}_{\mathrm{one}}$$

and $$L^{\mathrm{one}}{}_2$$

, as well as $${\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="00000018.png"\; state="\{\{state\}\}">L</figure-callout>}}^2{}_{\mathrm{one}}$$

and $${\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="00000018.png"\; state="\{\{state\}\}">L</figure-callout>}}^2{}_2$$

, turn off the steam generator 17, stop the circulation of steam through the annular spaces 14 and 15 of the double-mouth upper 1 and lower 2 wells.

и $$L^1{}_2$$

, а также $$L^2{}_1$$

и $$L^2{}_2$$

(см. фиг.2) сообщаются с приемами соответствующих насосов 10₁ и 10₂, а также 11₁ и 11₂, спущенных соответственно в составе технологических колонн труб 10 и 10' и 11 и 11'.Open the holes 6 '(see Fig. 5) of the filters 5 and 6, respectively, of the double-mouth upper 1 and lower 2 wells by combining them with the holes 8''and9''(see Figs. 2, 4 and 5) of the respective shanks 8 and 8 ', as well as 9 and 9' (see figure 1). The combination is made by any known method, for example, by rotating by means of a mechanical wrench from the mouths 13 and 13 'of the double-mouth upper 1 and lower 2 wells of the process columns of pipes 10 and 10' and 11 and 11 ', rigidly connected to the corresponding shanks 8 and 8', and 9 and 9 'at an angle of 90 ° (see figure 5). As a result of the rotation of the technological pipe columns together with the shanks at an angle of 90 °, the holes 8 '' (see Fig. 5) and 9 '' (see Fig. 2) of the shanks and holes 6 '(see Fig. 5) are combined 5 and 6. As a result of the selection zone $$L^{\mathrm{one}}{}_{\mathrm{one}}$$

and $$L^{\mathrm{one}}{}_2$$

, as well as $${\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="00000018.png"\; state="\{\{state\}\}">L</figure-callout>}}^2{}_{\mathrm{one}}$$

and $${\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="00000018.png"\; state="\{\{state\}\}">L</figure-callout>}}^2{}_2$$

(see figure 2) communicate with the techniques of the respective pumps 10 ₁ and 10 ₂ , as well as 11 ₁ and 11 ₂ , deflated respectively in the technological columns of pipes 10 and 10 'and 11 and 11'.

и $$L^1{}_2$$

, а также $$L^2{}_1$$

и $$L^2{}_2$$

.The selection of preheated bitumen is started simultaneously from the two-wellheads of the upper 1 and lower 2 wells according to the process columns of the pipes 10 and 10 'and 11 and 11' using the corresponding pumps 10 ₁ and 10 ₂ , as well as 11 ₁ and 11 ₂ until the temperature is reached in all extraction zones up to 35-45 ° C, which is determined by the data of thermograms taken from temperature sensors located in horizontal sections 3 and 4 (see Figs. 1 and 2) of double-well wells 1 and 2 opposite each of the selection zones $$L^{\mathrm{one}}{}_{\mathrm{one}}$$

and $$L^{\mathrm{one}}{}_2$$

, as well as $${\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="00000018.png"\; state="\{\{state\}\}">L</figure-callout>}}^2{}_{\mathrm{one}}$$

and $${\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="00000018.png"\; state="\{\{state\}\}">L</figure-callout>}}^2{}_2$$

.

As the temperature reaches 35-45 ° C in the selection zones, pumps 10 ₁ and 10 ₂ , as well as 11 ₁ and 11 _{2, are} switched off sequentially or simultaneously. After turning off the last of the pumps, the openings 6 '(see FIGS. 1 and 4) of the filters 5 and 6 are hermetically sealed with shanks 8 and 8', as well as 9 and 9 '.

To do this, rotate the technological pipe columns together with the liners from the wellheads 13 and 13 'at an angle of 90 °, and there is a disconnection (see Figs. 4 and 5) between the openings 6' of the filters 5 and 6 and the openings 8 '' and 9 '' shanks 8 and 8 ', as well as 9 and 9' respectively.

и $$L^1{}_2$$

, а также $$L^2{}_1$$

и $$L^2{}_2$$

двухустьевых скважин 1 и 2 герметично отсекаются от соответствующих межколонных пространств 14 и 15 двухустьевых скважин 1 и 2.As a result of the selection zone $$L^{\mathrm{one}}{}_{\mathrm{one}}$$

and $$L^{\mathrm{one}}{}_2$$

, as well as $${\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="00000018.png"\; state="\{\{state\}\}">L</figure-callout>}}^2{}_{\mathrm{one}}$$

and $${\mathrm{<figure-callout\; id="2"\; label="L"\; filenames="00000018.png"\; state="\{\{state\}\}">L</figure-callout>}}^2{}_2$$

double-well wells 1 and 2 are hermetically cut off from the corresponding annular spaces 14 and 15 of double-well wells 1 and 2.

The steam generator 17 is started and the heating process of the inter-well zone of the formation 20, as well as the zones of the formation 7 above the horizontal section 3 and below the horizontal section 4 of the double mouth upper 1 and lower 2 wells is resumed and the bitumen viscosity is reduced by closed steam circulation through the annular spaces 14 and 15 of the upper 1 and lower 2 double-well wells. Subsequently, the heating and selection cycles are repeated as described above until the bitumen is fully developed in the formation 7.

Implementation of the proposed method allows the development of a bitumen deposit by heating it without injecting a heat carrier (steam), which eliminates the water cut of the selected heated bitumen, and reduces the cost of the heat carrier. It is also possible to implement the method in a bitumen deposit, represented by layers up to 5-7 m thick, while due to alternating heating and selection of heated bitumen, a uniform production of a bitumen deposit occurs.

Claims (1)

A method of developing a bitumen deposit, including the construction of a double-wellhead upper and lower wells with horizontal sections, equipped with filters with holes located one above the other, the descent of technological pipe columns with pumps for selecting heated bitumen, heating the formation by injecting steam into both wells, heating the cross-hole zone of the formation, decrease in bitumen viscosity, taking thermograms from temperature sensors located in horizontal sections of wells, analysis of the reservoir condition for uniform heating and implementation is equal to Root heating of the formation, taking into account the obtained thermograms, characterized in that the filters of the horizontal sections of the upper and lower double-well wells are divided into sampling zones, shafts with holes are installed inside the filters opposite each of the sampling zones, which are lowered at the ends of the technological pipe columns from the mouths of the double-well wells, shanks are rigidly connected to the corresponding technological pipe columns with the possibility of hermetically closing or opening the filter openings of horizontal sections of the mouth wells, tie the annular spaces of the upper and lower double-well wells with one another from one mouth, tie the upper and lower double-well wells with the steam generator from the other mouth, with the filter openings of the horizontal sections of the double-well wells closed, the formation cross-sectional zone is heated, as well as the formation zones above and below the horizontal sections of double-well wells, reduce the viscosity of bitumen by closed steam circulation simultaneously along the annular spaces of the upper and lower double-well wells by means of a steam generator without injecting steam into the formation, when the temperature reaches 85-95 ° C according to thermograms taken from temperature sensors in the double-well well selection zones, turn off the steam generator, stop the steam circulation, open the filter holes by combining them with the holes of the shanks and start the selection heated bitumen at the same time from the upper and lower double-well boreholes through the process pipe columns using pumps, when the temperature reaches 35-45 ° C according to the thermograms taken from the temperature sensors in in the double-well wells selection zones, the pumps are turned off, the filter openings are hermetically sealed by separating them from the shank holes, the steam generator is started and the process of heating the inter-well zone of the formation is resumed and the bitumen viscosity is reduced by closed steam circulation through the annular space of the upper and lower double-well wells.

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