RU150455U1 - DEVICE FOR REDUCING WATER FLOW TO A WELL INSTALLED AS A WELL COMPLETION ELEMENT - Google Patents

Abstract

1. A device to reduce the flow of water into the well, which is an element of well completion, placed in the interval of contact with the reservoir, and made in the form of a layer of porous material, the entire surface of which has a contact angle greater than 90 °, characterized in that the porous material is placed under the casing is either under the filter element, or is an additional filter element that ensures the passage of the liquid phase first through a space filled with porous material, and then into the production th trubu.2. The device according to claim 1, characterized in that a porous material is used, the entire surface of which has a contact angle of more than 150 °. 3. The device according to claim 1, characterized in that a porous material with an average pore size of 10 μm to 750 μm is used. The device according to claim 1, characterized in that a porous material is used, which is a package of granules with a hydrophobic coating or made of a hydrophobic material. The device according to claim 4, characterized in that the proppant granules are used. The device according to claim 1, characterized in that the porous material is used, which is a compressed package of wire or fiber with a hydrophobic coating or made of hydrophobic material. The device according to claim 6, characterized in that basalt or mineral fiber is used.

Description

The technical solution relates to the field of the oil industry and can be used in the development of oil fields, namely to reduce the water cut in the production of oil producing wells, the reservoir of which contains an aquifer.

In the framework of this application, the term "complete the wells" means (see E. Soloviev, Completion: Textbook for universities-M .: Nedra, 1979, Theory and practice of completion: 5 tons / A.I. Bulatov, P .P. Makarenko, V.F. Budnikov et al. - M .: Nedra, 1997-1998, T.1-5) descent of the assembly from pipes, possibly filters (liquid flows through them) or subsequent perforation, packers (insulating elements) and pendants (fixing device (anchor) so that the whole structure is fixed in the indicated place).

Existing traditional methods and technologies for restoration of well productivity do not have sufficient technological and economic efficiency, and often their application in the fields is inconclusive, despite significant efforts and costs. In addition, the use of many of them leads to irreversible effects of the aftereffect, excluding the subsequent use of other, more promising methods that might appear in the future. In addition, the traditional methods and technologies used to restore well productivity are detrimental to the ecological balance of the environment.

Known (RU, patent 2161246, publ. 12/27/2000) a method of reducing water cut in oil production wells, including the creation of conditions in the wellbore, which facilitate the flow of oil from oil-bearing layers and prevent the flow of water from aquiferous layers. The implementation of the method is carried out in wells with a perforated casing string and tubing string (tubing) of variable diameter, operated by sucker rod pumps (SHGN).

A disadvantage of the known technical solution is its use only for wells of a mechanized production method, equipped with sucker rod pumps.

It is known (RU, patent 52092, publ. 10.03.2006) a device for reducing water cut in oil and gas wells, containing a tubing stub from the bottom of the tubular casing with holes in the lower part and an elastic elastic sleeve fixed in the upper part of the tubing above the holes. The above device allows for the selection of fluid below the bottom of the perforated formation.

The main disadvantages of this device are the following factors:

- when a depression is created in the well and a long period of operation, an elastic flexible gas-oil-resistant cuff fixed in the upper part of the tubing above the through holes begins to pass the borehole fluid through itself, as a result of which the “reverse cone” effect is lost;

- during long-term operation, tubing pipes made of easily drilled non-metallic material go into the category of “complicated bottom hole” and additional costs are required for their dismantling.

It is known (RU, patent 85941, published on 08.20.2009) a device for reducing the water content of produced products by creating the effect of the "inverse cone" on production wells. The known device comprises a production casing of a producing well with a perforation interval, a tubing string and pumping equipment. The equipment was lowered into the well sequentially by a single arrangement to the calculated depth, and the tubing string contains electric submersible centrifugal pumping units, a liner and a filter at the end for protection against clogging, while the filter for calculating the length of the tubing is installed below the perforation interval, and An anchor is installed above the perforation interval under the electric submersible centrifugal pump units with the ability to relieve axial loads on the connecting elements of the electric submersible cent obezhnyh pump installations, the reception of the motor and submersible centrifugal pump placed in a casing made of a tube having an inside diameter larger than the outer diameter of the motor, but less than the inner production string extracting borehole diameter.

A disadvantage of the known device should recognize the complexity of the design.

It is known (book Ashrafyan M.O., Lebedev O.A., Sarkisov N.M. Improving the design of bottom faces of wells. M., "bowels", 1987, p. 12, Fig. 1.h) well completion in the interval of contact with the formation - a collector equipped with gravel driving of sand filters - filtering material.

It is known (RU, patent 2245439, publ. 01/27/2005) placement in the interval of contact with the reservoir - the collector of the element of completion in the form of a porous oleophilic hydrophobic material. This leads to increased efficiency and durability of the well, as well as the intensity of oil extraction from the reservoir by increasing the supply circuit of the well and preventing watering of the well

The specified source is accepted as the closest analogue.

A disadvantage of the known device should be recognized as low efficiency in relation to reducing the flow of water into the well.

The technical problem solved by the developed device is to reduce the flow of water into the well.

The technical result achieved by the implementation of the device is to reduce the water content in the produced oil.

To achieve the specified technical result, it is proposed to use the developed device to reduce the flow of water into the well, which is a completion element placed in the interval of contact with the reservoir and representing a layer of porous material, the entire surface of which has a contact angle greater than 90 °, and the porous material placed under the casing or under the filter element that is part of the well completion tool, or an additional filter element, I provide first, the passage of the liquid phase through the space filled with porous material, and then into the production pipe.

The introduction of a layer of porous material placed in the indicated manner and the entire surface of which has a contact angle greater than 90 ° into the well completion device allows the hydrophobic component of the well fluid to pass through the pores of the device and not to pass its hydrophilic component (water).

In the most preferred embodiment of the developed device, a porous material is used, the entire surface of which has a contact angle of more than 150 ° and / or with an average pore size of 10 μm to 750 μm.

As the porous material, a porous material can be used, which is a package of granules (in particular, proppant) with a hydrophobic coating or made of a hydrophobic material.

Also as a porous material can be used compressed packaging of wire with a hydrophobic coating or made of hydrophobic material.

Also, compressed packaging made of mineral (in particular, basalt) fiber can be used as a porous material.

Completion of the well in the interval of contact with the reservoir, performed in accordance with the definition given on page 1 (paragraph 2) of the description, is equipped with a porous element (layer of material), the entire surface of which has a contact angle greater than 90 °. When the well fluid passes through this porous element, the hydraulic resistance will be small for hydrocarbons, but significant for the aqueous component of the well fluid. This leads to the fact that in the case of filtering water, or reservoir fluid with a high degree of water cut, additional hydraulic resistance will be created for water at the level of completion of the well. Thereby, the depression on the formation in the watered zone will decrease and, accordingly, the flow of formation fluid from this zone will decrease.

This technology will further reduce the water cut of wells and, accordingly, increase the life of wells and fields in general.

The advantages of this technology include its independence from the ratios of the densities and viscosities of water and oil. In fact, this technology will distinguish between the water phase and the oil phase and create hydraulic resistance specifically for the water phase.

As a filtering hydrophobic material, a proppant pack placed behind a filter (preferably granules of a similar size, with an average diameter of 0.5 to 1.2 mm, made of hydro-4; skim material (aluminosilicate) or coated with hydrophobic (selsiscvioxanes) can be used coated), basalt fiber or fiberglass, porous fluorosilicone, foam glass, etc. can also be used.

So when using aluminosilicate proppant packaging as an olefilic hydrophbic material, the water content in the produced oil decreased by 23%.

Claims (7)

1. A device to reduce the flow of water into the well, which is an element of well completion, placed in the interval of contact with the reservoir, and made in the form of a layer of porous material, the entire surface of which has a contact angle greater than 90 °, characterized in that the porous material is placed under the casing is either under the filter element, or is an additional filter element that ensures the passage of the liquid phase first through a space filled with porous material, and then into the production w pipe. 2. The device according to claim 1, characterized in that a porous material is used, the entire surface of which has a contact angle of more than 150 °. 3. The device according to claim 1, characterized in that a porous material with an average pore size of from 10 μm to 750 μm is used. 4. The device according to claim 1, characterized in that the porous material is used, which is a package of granules with a hydrophobic coating or made of hydrophobic material. 5. The device according to p. 4, characterized in that the proppant granules are used. 6. The device according to claim 1, characterized in that the porous material is used, which is a compressed package of wire or fiber with a hydrophobic coating or made of hydrophobic material. 7. The device according to p. 6, characterized in that used basalt or mineral fiber.