RU2410534C1 - Method and device for development of heavy oil or bitumen deposit by using two-head horizontal wells - Google Patents

Abstract

FIELD: oil and gas industry. ^ SUBSTANCE: invention refers to oil industry and can be used during development of heavy oil or bitumen deposit. Development method of heavy oil or bitumen deposit by using two-head horizontal wells involves construction of two-head upper injection and lower production wells with horizontal sections located one above the other. Heat carrier is pumped through injection well with warming-up of the formation by creating the steam chamber and product is extracted through production well. At that, during construction of wells the horizontal section of production well is equipped with filter made in the form of pipe installed inside opened section of casing pipe with a gap which is divided into sections with tight ring inserts. Gaps in sections are filled with water-swellable granules. ^ EFFECT: increasing operating efficiency of filter owing to controlling the extraction of the well product. ^ 2 cl, 2 dwg

Description

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

A known method of developing an oil field (RF patent No. 2211318, IPC 8 EV 43/24, published in Bulletin No. 24 dated 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 day surface, installation of 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 through tubing string from the inlet and outlet sections, product selection at the outlet section while continuing to pump coolant through the inlet section.

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 heterogeneous oil bitumen deposit (RF patent No. 2287678, IPC 8 Е21В 43/24, published in Bulletin No. 32 of 11/20/2006), including the construction of a production double-well horizontal well and production selection, characterized in that it is higher than the production double-well a horizontal well parallel to it, an injection double-well horizontal well is being built, thereby creating a pair of double-well horizontal wells; a similar pair of double-well horizontal wells, a pair of double-well horizontal wells are carried out separately, covering the most productive zones of the reservoir, the operating modes of the pairs of dual wellhead horizontal wells for injection are established taking into account the characteristics of each section of the reservoir, the coolant is pumped into the upper injection dual wellhead horizontal wells from both mouths, and production is selected from the producing dual wellhead horizontal wells with a swab pump moreover, the swab pumps of neighboring producing double-mouth horizontal wells are connected to each other.

The disadvantage of this method is the limited application, which can be done only if there are adjacent pairs of dual-well injection and production wells.

The closest in technical essence is the method of developing a heavy oil or bitumen field using double-well horizontal wells (RF patent No. 2340768, IPC 8 ЕВВ 43/24, published in bulletin No. 32 of December 10, 2008), including the injection of coolant through two-well horizontal injection well, heating of the reservoir with the creation of a steam chamber and product selection through the two-mouth horizontal production well, characterized in that the heating of the reservoir begins with steam injection into both wells, warm the cross-hole zone of the formation, reduce the viscosity of oil or bitumen, and create a steam chamber by pumping a coolant with the possibility of punching the latter to the upper part of the reservoir and increasing the size of the steam chamber during the production process, in which thermograms of the steam chamber are taken, and the state of its heating is analyzed for uniform heating and the presence of temperature peaks, and taking into account the obtained thermograms, the steam chamber is uniformly heated by changing the filtration direction and / or the injection modes t plonositelya and selection of products, the volume of pumping coolant through the mouth of the injection well and / or selection of products through the mouth of the production well at a ratio change,%: (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 a cable with thermal sensors.

The disadvantages of this method and the device with which this method is implemented are:

- firstly, the low reliability of the device with which the proposed method is implemented, since the pumps do not have filters, and in the event of a coolant breakthrough, sand, sludge, etc. fall into the pump, which leads to a quick breakdown of the pump;

- secondly, the large financial and material costs for implementing the method associated with the fact that the temperature sensors on the cable are placed along the entire length of the shafts of the double-well wells;

- thirdly, during the implementation of the method, constant monitoring of the temperature in the steam chamber is necessary, since the breakthrough of the coolant into the horizontal section of the producing well is judged by the readings of the temperature sensors, based on which the thermograms of the steam chamber are built, their analysis is made, on the basis of which they are changed direction of filtration and / or modes of coolant injection and product selection.

The objective of the invention is to reduce financial and material costs for implementing the method with the ability to automatically turn off a certain interval of the horizontal section when a coolant breaks into it, as well as improving the reliability of the device with which the proposed method is implemented.

The stated technical problem is solved by the method of developing a heavy oil or bitumen field using horizontal double-well wells, including the construction of a double-well upper injection and lower production wells with horizontal sections located one above the other, pumping the heat carrier through the injection well with the formation warming up by creating a steam chamber and selecting products through production well with a decrease in production in areas of temperature peaks, providing uniform prog in the steam chamber.

What is new is that in well construction, the horizontal section of the producing well is equipped with filter sections with reduced throughput in sections depending on the breakthrough of the coolant.

Also, the problem is solved by a device for implementing the proposed method, including a two-wellhead upper injection and lower production wells with horizontal sections located one above the other.

What is new is that the horizontal section of the production well is equipped with a filter made in the form of a pipe installed inside the opened section of the casing with a gap, which is divided into sections by sealed annular inserts, and the gaps in the sections are filled with water-swelling granules.

Figure 1 schematically shows the proposed method and device for its implementation.

Figure 2 schematically shows a filter section.

The proposed method is as follows.

First, the construction of the upper double-well injection well 1 (see Fig. 1) and the lower double-well production well 2 with horizontal sections 3 and 4, respectively, located one above the other and opening the producing formation 5 with heavy oil or bitumen are carried out. During the construction of a double-well injection well 1, its horizontal section 3 is made in the form of a perforated casing 6.

During the construction of a double-well production well 2, its horizontal section 4 is equipped with filter sections 7 (see Figs. 1 and 2).

The filter 7 is made in the form of a pipe, for example, with a diameter of 140 mm, installed inside the exposed section of the casing 6, for example, made in the form of a perforated pipe with a diameter of 168 mm with a gap.

The gap between these pipes is sealed by hermetically annular inserts 8 (see FIGS. 1 and 2) into sections S of a length of, for example, 1 meter and filled with water-swelling material in granules. The number of filters 7 depends on the length of the horizontal section 4 of the dual well production well. Filter 7 is made on the basis of production services.

Next, the double-well injection well 1 is equipped with a tubing string 9 with packers 10 and 10 'and a horizontal perforated section 11.

The double-well injection well 1 is used to pump the coolant into the producing formation 5, and the double-well producing well 2 is used to produce heavy oil or bitumen from the producing formation 5.

A tubing string 12 and 12 'with a packer 13 and 13', a submersible pump 14 and 14 'at the end, respectively, is lowered into a two-well production well 2 from each side. Submersible pumps 14 and 14 ', for example, can be screw.

Next, they begin to pump coolant (for example, superheated steam) from the steam generator (not shown in FIGS. 1, 2) into the reservoir 5 through the tubing string 9 through its horizontal perforated section 11 and horizontal section 3 of the double-well injection well 1, made in the form of perforated casing string 6.

Depending on the permeability of the reservoir 5, the injection pressure is selected and, depending on the effective oil-saturated thickness of the reservoir 5, the volume of injected steam is determined, and the reservoir 5 is heated to create a steam chamber.

The selection of preheated heavy oil or bitumen is carried out using submersible pumps 14 and 14 ', and the preheated heavy oil or bitumen from the reservoir 5 enters the filter 7 of the horizontal section 4 of the two-well production well 2.

Heated heavy oil or bitumen, falling into the filter 7, flows between the water-swellable granules (see Figs. 1 and 2) and first enters the 15th filter 7 of the horizontal section 4 of the two-well production well 2, and then enters the reception of submersible pumps 14 and 14 ' that pump heavy oil or bitumen to the surface.

If the coolant has erupted into the filter 7, then the water-swelling granules located in the gap of the filter 7 react to this because they have hydrophilic properties, while the granules expand and reduce the throughput of the filter 7, only in those sections - S, where coolant has broken through. Depending on the temperature of the coolant that has erupted into the filter 7, its throughput varies, the higher the temperature of the coolant that has erupted into the filter 7, the lower its throughput, up to the termination of the flow of fluid into the horizontal section 4 of the two-well producing well 2.

A device for implementing the proposed method includes an upper two-mouth injection 1 and a lower two-mouth production well 2 with horizontal sections 3 and 4, respectively, located one above the other and opening the reservoir 5. The injection well 1 at the wellhead is equipped with a steam generator (not shown in FIGS. 1, 2 ) The horizontal section 3 of the double-well injection well 1 is made in the form of a perforated casing 6.

The horizontal section 4 of the double-well production well 2 is performed in the form of sections of filters 7 (see Figs. 1 and 2) with annular inserts 8.

The double-well injection well 1 is equipped with a tubing string 9 with packers 10 and 10 'and a horizontal perforated section 11.

A tubing string 12 and 12 'with a packer 13 and 13' with a submersible pump 14 and 14 'at the end, respectively, is lowered into a two-well production well 2 from each side. Submersible pumps 14 and 14 ', for example, can be screw.

The filter 7 is made in the form of a pipe 16, for example, with a diameter of 140 mm and a length of 10 meters, installed inside the exposed section of the casing 6, for example, made in the form of a perforated pipe 17 with a diameter of 168 mm and a similar length (10 meters) with a gap.

The diametrical gap between these pipes is divided by hermetically annular inserts 8 into sections S with a length of, for example, 1 meter and filled with water-swelling material in granules 18, which can expand upon contact with water.

The device operates as follows.

The coolant (for example, superheated steam) is injected from the steam generator into the reservoir 5 (see Fig. 1) into the upper double-well injection well 1 through the tubing string 9 through its horizontal perforated section 11 and the perforated casing 6 of the horizontal section 3 of the double-well injection well 1 .

The selection of the heated heavy oil or bitumen is carried out using submersible pumps 14 and 14 ', for example, screw pumps, and the heated heavy oil or bitumen from the reservoir 5 first enters the filter 7 and flows from the perforated pipe 16 of a larger diameter (see figure 2) between the water-swellable granules 18 to a perforated pipe 17 of a smaller diameter and through a perforated pipe 17 of a smaller diameter, it first gets inside 15 of the filter 7 of the horizontal section 4 of the two-mouth production well 2, and then to the reception of submersible pumps 14 and 14 ', orye pumped heavy oil or bitumen to the surface.

As soon as the coolant breaks into the filter 7, the water-swellable granules 18 located in the gap of the filter 7 react and, over time, expand and reduce the throughput of the filter 7 only in those sections - S, where the coolant breaks through.

The proposed method for the development of a heavy oil or bitumen field using double-well horizontal wells requires lower financial and material costs compared to the prototype, since the implementation of this method does not require expensive temperature sensors and cables laid along the entire length of both wells. In addition, this method allows you to automatically turn off the filter section (s) of the horizontal section of the dual well production well when the coolant breaks into it due to the water-swelling material in the granules, which, when in contact with water, reduces the filter throughput in sections and thereby regulates the selection of products from the well.

The device with which this method is implemented due to the presence of a filter with an adjustable flow rate installed in a horizontal section of a double-well production well allows to extend the overhaul period of a submersible pump, which improves the reliability of the device.

Claims (2)

1. A method of developing a heavy oil or bitumen field using double-mouth horizontal wells, including the construction of a double-mouth upper injection and lower production wells with horizontal sections located one above the other, pumping the heat carrier through the injection well with the formation warming up by creating a steam chamber and selecting products through the production well with a decrease in selection in areas of the presence of temperature peaks, providing uniform heating of the steam chamber, characterized in that when well construction, the horizontal section of the producing well is equipped with filter sections with reduced throughput in sections depending on the breakthrough of the coolant. 2. A device for implementing the method, comprising a double-mouth upper injection and lower production wells with horizontal sections located one above the other, characterized in that the horizontal section of the production well is equipped with a filter made in the form of a pipe installed inside an open section of the casing with a gap that it is divided into sections by hermetic annular inserts, and the gaps in the sections are filled with water-swelling granules.

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