RU2334092C1 - Method of bitumen production from underground deposit - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: method involves drilling and commissioning injection well ending with a horizontal site in the deposit, and production well with horizontal site ending in the deposit at the level lower than the injection well, creating a permeable area between injection and production wells, injecting heat carrier to the injection well and simultaneous hydrocarbon withdrawal over the production well. According to the invention, horizontal site of the injection well is oriented towards the production well, its length comprising 95-99% of the distance between the wells. Horizontal site of the production well is oriented towards the injection well and its length comprises 95-99% of the distance between the wells. Permeable zone is created between the horizontal sites of injection and production wells by sequential fracturing and injecting horizontal propping agent layer in each horizontal site before the beginning of well operation, and by additional heating deposit by means of heat carrier injection to the injection and production wells for 2-6 months.

EFFECT: streamlined process and improved deposit production efficiency due to expanded coverage area of underground bitumen deposit.

2 dwg

Description

The invention relates to a method for producing hydrocarbons from an underground bitumen deposit, the production of which requires their heating.

A known method of developing an oil field (patent RU No. 22113857, IPC 7 ЕВВ 43/24, published in Bulletin No. 28 of 10.10.2003), including drilling vertical wells with sidetracks, pumping coolant into the reservoir through sidetracks and selection oil through them, and vertical wells are drilled to the bottom of the lower object with their placement in one of the areal systems, while before the start of areal injection of a working agent, for example, water, sidetracks are drilled into the formation in each vertical well in each production facility of the formation, then by sequential treatment sidetracks by feeding them to subsequent selection of coolant through the lateral holes of oil well production to reduce to a minimum viable level, the injection of steam and selection cycles oil repeated until the maximum allowable water cut oil.

The disadvantage of this method is that the selection of products from the well is carried out cyclically, combining it with steam injection to the maximum allowable water cut of the produced product, which reduces the amount of oil produced and leads to significant heat energy costs for heating the formation.

The closest in technical essence is the method of developing high-viscosity oil and bitumen deposits with horizontal wells (patent RU No. 2237804, IPC 7 ЕВВ 43/24, published in bulletin No. 28 dated 10.10.2004), including drilling wells for a specific the grid, injection of the displacing agent through the injection wells and selection of formation fluids through the production wells, while the wells are drilled along a radial grid so that the injection wells are located on the reservoir closer to the upper boundary of the formation at the most pronounced interlayers, and production - closer to the lower boundary of the reservoir, and at the initial stage of development in all wells, thermocyclic treatment of the formation with steam stimulation is carried out with the subsequent transition to the selection of formation fluids through production wells with areal exposure to the formation through injection wells.

The disadvantages of this method are:

firstly, the complex process of the method;

secondly, the small area covered by horizontal deposits and, as a consequence, the low efficiency of the development of the deposits.

An object of the invention is to simplify the process of implementing the method, as well as increasing the efficiency of developing a deposit by increasing the coverage area of an underground bitumen deposit.

The stated technical problem is solved by a method of producing bitumen from an underground deposit, comprising drilling and preparing for operation an injection well, which ends with a horizontal section in the reservoir, and a production well, the horizontal section of which ends in the reservoir below the level of the injection wells, creating a permeable zone between the injection and producing wells , pumping coolant into the injection well and simultaneously taking hydrocarbons from the producing well.

What is new is that the horizontal sections of the wells are oriented towards each other and are made with a length of 95-99% of the distance between the wells, after which hydraulic fractures are sequentially performed in each of the horizontal sections with the injection of a horizontal proppant layer.

The figure 1 in a longitudinal section schematically shows an image of an underground deposit of bitumen.

The figure 2 presents a diagram of the fracturing with the injection of a proppant layer.

The essence of the method is as follows.

A pair of wells is being constructed, consisting of injection 1 (see Fig. 1) and producing 2 wells, which are cased and cemented after drilling.

Next, the injection well 1 is equipped with a horizontal end section 3 in the bitumen deposit 4, located at level 5 and oriented towards the producing well 2, with a length of 95-99% of the distance L between the wells.

Next, the producing well 2 is equipped with a horizontal section 6 in the bitumen deposit 4, located at level 7, but below the level 5 of injection well 1 and oriented towards injection well 1, with a length of 95-99% of the distance L between the wells.

After that, that is, before the start of operation in each of the horizontal sections 3 and 6, respectively, of the injection 1 and production 2 wells, hydraulic fracturing is carried out in series with the injection of the proppant layer 8 (see Fig. 2), while a permeable zone is created between the horizontal end sections 3 and 6.

The formation is pre-heated by pumping coolant into the producing and injection wells for a certain time, for example, 2-6 months.

Next, injection 1 and production 2 wells are put into operation, while the coolant is injected into injection well 1 and, at the same time, hydrocarbons are taken from production well 2.

The proposed method allows to increase the efficiency of the development of deposits by increasing the coverage area of the bitumen deposits in horizontal sections by creating a permeable zone between the horizontal end sections by fracturing with the injection of a horizontal proppant layer, and simplifying the process of implementing the method allows to save material and financial costs.

Claims (1)

A method for producing bitumen from an underground deposit, comprising drilling and preparing for operation an injection well, which is completed with a horizontal section in the reservoir, and a production well, the horizontal section of which is completed in the reservoir below the level of the injection well, creating a permeable zone between the injection and producing wells, pumping coolant into injection well and the simultaneous selection of hydrocarbons from the producing well, characterized in that the horizontal section of the injection well they are rubbed in the direction of the production well and performed with a length of 95-99% of the distance between the wells, the horizontal section of the production well is oriented towards the injection well and performed with a length of 95-99% of the distance between the wells, and a permeable zone is created between the horizontal sections of the injection and production wells, for which, prior to commencement of operation, in each of the horizontal sections hydraulic fractures are successively performed with the injection of a horizontal proppant layer and additionally t pre-heating the reservoir by pumping coolant into the producing and injection wells for 2-6 months.

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