RU2667242C1 - Method of developing well oil reservoir with horizontal termination - Google Patents

Abstract

FIELD: oil and gas industry.SUBSTANCE: invention relates to the oil industry and can find application in the development of heterogeneous terrigenous or carbonate productive formations with horizontal wells. By the method, the areas are identified as intervals of a productive formation with an inflow profile that differ in the specific oil rate by 20 % or more. Selected sections are separated by packers. Pump is descended into the well and well production is taken from each site with the maintenance of the same water cut in the sections. In this case, horizontal drill holes are drilled or horizontal wells are chosen so that their most productive areas in horizontal wells are located in sequence closer to the bottom. As the product is flooded, the most flooded and productive areas are successively cut off from the face by passing packers with adjustable valves and/or jets, allowing to maintain the same water cut of the product along the entire length of the horizontal completion of the well when extracted by one pump located above the proximal to the mouth of the installed packers. Due to the valves and/or jets of the packers, the selections of the highly productive sections are reduced and the water flooding front is leveled near the horizontal end of the well, which prolongs the operation of the well in a predetermined mode to ensure the selection of additional products.EFFECT: increased effectiveness of the method due to increasing its manufacturability and cheaper, providing the possibility of perform the descent, repair and maintenance of descended structural elements.1 cl, 1 dwg

Description

The invention relates to the oil industry and may find application in the development of heterogeneous terrigenous or carbonate reservoirs with horizontal wells.

A known method of developing a massive oil reservoir (patent RU No. 2443854, IPC ЕВВ 43/20, ЕВВ 34/08, published on 02/27/2012 in Bull. No. 6), including the study of reservoir properties, drilling of injection wells and branched production wells with horizontal sections , the injection of the displacing agent into the injection wells and the selection of products through the production well, while two horizontal sections of the producing well are located one above the other within the same reservoir, studies of horizontal sections on the productivity of each second, after which a pressure-controlled valve with a replaceable nozzle is installed in the passageway between the horizontal sections, the selection from the production well is carried out by one pump installed above the valve with a productivity higher than the productivity of the upper horizontal section, but less than the productivity of two sections, while the valve is made with the possibility uncoupling of horizontal sections when the liquid level in the well exceeds the maximum allowable value, messages from bottom to top of horizontal tkov when the liquid level below the minimum.

The disadvantages of this method are:

- narrow scope due to implementation without taking into account zonal heterogeneity only in massive formations;

- high cost of sales due to the need to use two horizontal sections of the well.

There is also a method of developing an oil reservoir with a horizontal completion well (patent RU No. 2590918, IPC ЕВВ 43/16, ЕВВ 43/12, Е21В 43/25, published on July 10, 2016 in Bull. No. 19), including drilling or selecting an already drilled horizontal well, allocation of horizontal intervals of the reservoir, differing in properties, descent of the tubing string with the packer into the well, separation of the intervals of the reservoir by the packer, descent of the pump into the well, control devices in the form of electric valves and manometers-thermometer s, raising the product to the surface by the pump along the in-pipe space, and then, between the intervals of the reservoir, the equipment for local fastening of the well is installed, the assembly consisting of a packer, tubing string, valve equipment body with a lower electric valve located in it is lowered into the well regulating the inflow along the tubing string, pressure gauge-thermometer for measuring pressure in the tubing string in front of the housing, ver with an electric valve for regulating the inflow from the annulus into the cavity of the body, a manometer-thermometer for measuring pressure in the annulus and a manometer-thermometer for measuring the suction pressure of the pump, and the string of tubing to the wellhead, the well is developed in three stages with selection products for the tubing string and annulus, only for the tubing string and then only for the annulus, analyze the flow rate measurements in and water cut, exploit the interval of the well with less water cut when stopping the operation of the interval with greater water cut at the initial increased flow rate until the bottomhole pressure drops and the fluid level is below the optimum and with the subsequent production flow rate while maintaining stable bottom hole pressure, the well is operated until the water cut from the production well is exceeded water cut interval from the second interval and then operate both intervals at the same time, support water cut nnosti both slots at the same level.

The disadvantages of this method are:

- the complexity of installation and repair due to the large number of technically and technologically complex interconnected structural elements installed in the well, and if one of the elements fails, it is necessary to remove the entire structure with stopping production from the well;

- complex control due to the need for coordinated control of both the pump and valves;

- large time and material costs for the manufacture, descent and repair of structural elements during the implementation of the method.

The closest is a method of developing an oil reservoir with horizontal completion wells (patent RU No. 2540720, IPC ЕВВ 43/16, published on 02/10/2015 in bull. No. 4), including drilling or selection of already drilled horizontal wells, allocation of sections in the form of productive intervals formation, descent into the well of the pump, separation of sections by packers and selection of well products from each section, while during the development of a terrigenous or carbonate formation, the inflow profile is determined previously in the horizontal wellbore, sections with Ofil inflows, differing in specific oil flow rate by 20% or more, packers are installed in places where inflow profile changes, one pump is lowered into the center of each section at a pipe string with a maximum distance between pumps in a horizontal well of not more than 200 m, pumps are placed sequentially on one pipe string, each subsequent pump from the end of the horizontal shaft to its beginning is selected from the condition that the fluid flow rate is not less than the sum of the fluid flow rates of the previous pumps.

The disadvantages of this method are:

- the complexity of installation and repair due to the large number of pumps installed in the well, and if one of the pumps fails, it is necessary to remove the entire structure with stopping production from the well;

- complex control due to the need for coordinated pump control;

- large time and material costs for the manufacture, launching and repair of pumps during the implementation of the method.

The technical task of the alleged invention is the creation of a cheap and technologically advanced method of developing an oil reservoir with a horizontal end well, which allows lowering, repair, maintenance of deflated structural elements.

The technical problem is solved by a method of developing an oil reservoir with a horizontal end well, including drilling or selecting already drilled horizontal wells, identifying sections in the form of intervals of the reservoir with an inflow profile that differ from each other in specific oil production by 20% or more, separating the sections with packers, the descent into the well of the pump and the selection of well production from each section while maintaining the same water cut in the sections, and due to valves and / or packer nozzles, the high near-productive sections and even out the waterflooding front near the horizontal end of the well, which lengthens well operation in a given mode to ensure the selection of additional products.

What is new is that horizontal wells are drilled or horizontal wells are selected so that their most productive sections in horizontal wells are located sequentially closer to the bottom, as waterlogging products, the most flooded and productive sections are sequentially cut from the bottom by passage packers with adjustable valves and / or jets, allowing to maintain the same water cut of the product along the entire length of the horizontal end of the well during production by one pump, are located over near to the mouth of the installed packers.

The drawing shows a diagram of the implementation of the method.

The method is implemented as follows.

A method of developing an oil reservoir 1 by a well 2 with a horizontal end 3 includes drilling or selecting already drilled horizontal wells 2, identifying sections 4, 5 and 6 in the form of intervals of the reservoir 1 with an inflow profile that differ from each other in specific oil flow rate by 20% and more, the separation of sections by packers 7 and 8, the descent into the well 2 of pump 9 and the selection of production of well 1 from each section 4, 5 and 6, while maintaining the same water cut in these sections 4, 5 and 6. In this case, the horizontal ends of 3 wells 2 or choose th horizontal wells 2 so that their most productive sections 4 and 5 (productivity of section 4 are higher than section 5, and section 5 is higher than section 6) at the horizontal ends of 3 wells 2 are sequentially closer to the bottom of well 2. As the water cuts (more than 90%) ) the most watered and productive areas, first 4, and then 5 sequentially from the bottom, are cut off by passage packers 7 and 8, respectively, with adjustable and removable valves and / or jets 10 and 11 (shown conditionally), allowing to maintain the same water cut due to the controlled selection along the entire length of the horizontal end 3 of the well 2 during production by one pump 9, located above the closest to the mouth of the installed packers - packer 7 first, and then packer 8. Adjustable reduction in selection due to valves and / or nozzles 10 and 11 of packers 7 and 8 of the highly productive sections 4 or 4 and 5 leads to equalization of the waterflooding front near the horizontal end 3 of well 2 and longer operation of well 2 in a cost-effective manner, without cutting off sections 4 or 4 and 5 and without conducting water in them gold-plating operations, which saves material and time costs, and the selection of products from the horizontal end of 3 wells 2 allows you to get additional production volumes of oil reservoir 1. Adjustable valves and / or jets 10 and 11 can be manufactured according to any of the known designs (see patents RU No.№ 2441141, 2443854 or the like). In the event of a failure or, if necessary, adjustment of the valves and / or jets 10 and 11, they are removed by known tubes (see patents RU No. 45769, 43577, 40379 or the like) after removing the pump 9 and replaced by valves and / or jets 10 and 11 with the required throughput (determined empirically), with subsequent installation in place. Most often, pumps 9 fail, but their removal, repair and replacement occur in the normal mode, as well as when operating wells 2 without installed packers 7 and 8.

The proposed method of developing an oil reservoir with a horizontal well is the most economically and technologically efficient, while it allows for the production of a standard, technologically uncomplicated descent process, repair, and maintenance of deflated structural elements.

Claims (1)

A method of developing an oil reservoir with a horizontal completion well, including drilling or selecting already drilled horizontal wells, identifying sections in the form of intervals of the reservoir with an inflow profile that differs from each other in specific oil production by 20% or more, separating the sections with packers, and lowering into the well pump and selection of well products from each section, maintaining the same water cut in the sections, characterized in that horizontal wells are drilled or horizontal wells are selected so that their most productive sections in horizontal wells are located sequentially closer to the bottom, as the watering of the products, the most watered and productive sections are sequentially cut from the bottom by flow packers with adjustable valves and / or nozzles, allowing to maintain the same water cut over the entire length of the horizontal end wells during production with one pump located above the closest to the wellhead from installed packers, and due to valves and / or packer nozzles they reduce the selection of highly productive areas and even out the waterflood front near the horizontal end of the well, which lengthens the well’s operation in the specified mode to ensure the selection of additional products.

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