RU103845U1 - DEVICE FOR DEVELOPING DEPOSITS OF HIGH-VISCOUS OIL OR BITUMEN - Google Patents

Abstract

 A device for developing a reservoir of highly viscous oil or bitumen, including a two-well well with a production casing, cased at both ends to a section located in the reservoir, a pump for selecting well products, deflated through one wellhead, and a process column for pumping coolant, deflated through another wellhead, characterized in that the process column for pumping the coolant is thermally insulated, and the section of the well located in the reservoir, in it is full of inclined, the production casing is equipped with two filters located at the ends of the inclined section, between which there are annular cuffs on the outside, made with the possibility of tight interaction with the walls of the well at a distance that excludes the breakthrough of the coolant through the reservoir, while inside the production casing between the filters is installed deaf packer, and the pump is located on the lower side of the inclined shaft.

Description

The proposal relates to the field of oil production using heat, mainly from reservoirs with heavy, high viscosity or bitumen oil.

A known method of developing a field of heavy oil or bitumen using double-mouth horizontal wells (RF patent No. 2340768, IPC 8 ЕВВ 43/24, published in Bulletin No. 34 dated December 10, 2008), including the injection of coolant through a double-mouth horizontal injection well, warming up the productive formation with the creation of a steam chamber and selecting products through the two-mouth horizontal production well, while heating the productive formation begins with steam injection in both wells, heats the inter-well zone of the formation, reduces the viscosity tee or bitumen, and the steam chamber is created by pumping the coolant with the possibility of punching the latter to the top of the reservoir and increasing the size of the steam chamber during the production process, in which thermograms of the steam chamber are taken, the state of its heating for uniformity of heating and the presence of temperature peaks are analyzed, and Taking into account the obtained thermograms, the steam chamber is uniformly heated by changing the filtration direction and / or the modes of coolant injection and product selection, while the injection volume 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).

As well as a device for implementing this method, comprising a two-wellhead injection and lower production wells with horizontal sections located one above the other, the injection well at the wellhead equipped with a steam generator, and the producing well equipped with a submersible pump, while both wells are equipped with optical fiber cable with temperature sensors.

The disadvantages of this device are:

- firstly, the large financial and material costs associated with the construction of double-well wells (the cost of building a double-well well is three times more expensive than a single-well well), in addition, temperature sensors on an fiber-optic cable are placed along the entire length of both shafts of double-well wells.

- secondly, the breakthrough of the coolant in the horizontal section of the producing well is judged by the readings of the temperature sensors, on the basis of which the thermograms of the steam chamber are built, their analysis is made, on the basis of which the direction of filtration and / or the modes of pumping the coolant and production selection are changed. This process does not occur automatically and requires constant monitoring of the temperature in the steam chamber.

The closest in technical essence is the method of developing deposits of highly viscous oil or bitumen (patent RU No. 2342524, ЕВВ 43/24, published in Bulletin No. 36 dated 12/27/2008), including drilling a two-well well, fixing it with a production string, injection coolant through one wellhead, and product selection through another wellhead, while before securing the well, the horizontal section of the double-well well is extended to obtain an additional wellbore, which is also fastened by the production casing, through the wellhead from the additional itelnogo wellbores equipped with pumping equipment, and injection of coolant and product selection are performed simultaneously, wherein the selection of products produced from the well mouth from the secondary portion, and injection of coolant through another producing wellhead.

As well as a device for implementing this method, including a two-well borehole with a casing string, cased at both ends to a section that is located in the reservoir, a pump for selecting well products deflated through one wellhead and a process column for pumping coolant deflated through another wellhead

The disadvantages of this device are:

- firstly, the low efficiency of the device associated with the small volume of production (heated high-viscosity oil or bitumen) in the reservoirs with low reservoir pressure, since the trunk in the reservoir is horizontal, as well as significant heat loss during the pumping of the coolant through the process column pipes;

- secondly, the low reliability of the device, since it is possible breakthrough of the coolant in the sampled product while reducing the level of sampled product at the pump in the production casing through the first mouth, therefore, if the level of sampled product in the production casing is reduced, it is necessary to turn off the pump in order to prevent coolant pumping to day surface with selected products.

The objective of the invention is to increase the efficiency of product selection in formations with low reservoir pressure, as well as improving the reliability of the device by eliminating the breakthrough of the coolant in the selected product during operation of the device.

The problem is solved by a device for the development of deposits of highly viscous oil or bitumen, including a two-well well with a production casing, cased at both ends to the site that is located in the reservoir, a pump for selecting well products, lowered through one wellhead, and a process column for pumping coolant lowered through another wellhead.

New is that the technological column for pumping the coolant is thermally insulated, and the section of the well located in the reservoir is inclined, the production column is equipped with two filters located at the ends of the inclined section, between which there are ring cuffs made on the outside that are sealed interactions with the walls of the well at a distance that excludes the breakthrough of the coolant in the reservoir, while inside the production string filters installed deaf packer and a pump located on the side of the lower portion of the inclined bore.

The figure schematically shows a device for developing deposits of highly viscous oil or bitumen.

A device for developing a reservoir of highly viscous oil or bitumen includes a two-wellbore 1, section 2 of which is inclined in the reservoir 3. The two-well 1 is equipped with a production casing 4, cased from both ends to the inclined section 2.

The production casing 4 is equipped with two filters 5 and 6, located at the ends of the inclined section 2, between which from the outer side 7 there are ring cuffs 8 and 9, made with the possibility of tight interaction with the walls of the well 1 at a distance - S, eliminating the breakthrough of the coolant in the reservoir 3. In the in-tube space 10 of the production casing 4 between the filters 5 and 6, a blank packer 11 is installed.

A pump 13, for example, an electric centrifugal pump (ESP) with a filter 14, was lowered into a two-well borehole 1 from the side of the lower portion of the inclined shaft 2 for the selection of heated high-viscosity oil or bitumen on a tubing string 12, for example, an electric centrifugal pump (ESP) with a filter 14. A technological a column 15 with perforations 16 for pumping a coolant, and the process column 15 is thermally insulated.

The device operates as follows.

Before operation of the device, it is mounted in a double-well borehole 1, as shown in the figure.

Then, the coolant (for example, water vapor at t = 200ºC) is injected from a steam generator (CCGT) (not shown in the figure) into a double-wellbore 1 through a heat-insulated production string 15 through perforations 16 and a filter 6 of the production string 4 into the high-viscosity reservoir 3 oil or bitumen.

The coolant enters directly into the reservoir 3 due to the deaf packer 11 installed in the in-tube space 10 of the production string 4 and the annular cuffs 8 and 9 installed on the outside 7 of the production string 4 and made with the possibility of tight interaction with the walls of the well 1 at a distance - S , excluding the breakthrough of the coolant in the reservoir 3 and determined empirically.

The coolant warms up the reservoir 3 from top to bottom, heating and displacing highly viscous oil or bitumen through the filter 5 into the production string 4 and to the filter 14 of the pump 13. From where the heated viscous oil or bitumen arrives at the intake of pump 13. The pump 13 pumps the heated high-viscosity oil or bitumen to day surface.

A device for developing a deposit of highly viscous oil or bitumen is quite effective in working in reservoirs with low reservoir pressure, since the trunk in the reservoir is horizontal and avoids heat loss during the injection of the coolant, since a thermally insulated process pipe string is used for this purpose. In addition, the device is reliable in operation, since it allows to exclude a breakthrough of the coolant in the selected product due to isolation of both the annular and in-pipe spaces of the production string while simultaneously pumping the coolant from one wellhead and selecting heated high viscosity oil or bitumen from the other mouth of the two-well well.

Claims (1)

A device for developing a reservoir of highly viscous oil or bitumen, including a two-well well with a production casing, cased at both ends to a section located in the reservoir, a pump for selecting well products, deflated through one wellhead, and a process column for pumping coolant, deflated through another wellhead, characterized in that the process column for pumping the coolant is thermally insulated, and the section of the well located in the reservoir, in it is full of inclined, the production casing is equipped with two filters located at the ends of the inclined section, between which there are annular cuffs on the outside, made with the possibility of tight interaction with the walls of the well at a distance that excludes the breakthrough of the coolant through the reservoir, while inside the production casing between the filters is installed deaf packer, and the pump is located on the lower side of the inclined shaft.