RU2283947C1 - Method for oil pool development with horizontal wells - Google Patents

Method for oil pool development with horizontal wells Download PDF

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Publication number
RU2283947C1
RU2283947C1 RU2005120674/03A RU2005120674A RU2283947C1 RU 2283947 C1 RU2283947 C1 RU 2283947C1 RU 2005120674/03 A RU2005120674/03 A RU 2005120674/03A RU 2005120674 A RU2005120674 A RU 2005120674A RU 2283947 C1 RU2283947 C1 RU 2283947C1
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RU
Russia
Prior art keywords
oil
horizontal
distance
trunk
water contact
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RU2005120674/03A
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Russian (ru)
Inventor
Шафагат Фахразович Тахаутдинов (RU)
Шафагат Фахразович Тахаутдинов
Раис Салихович Хисамов (RU)
Раис Салихович Хисамов
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Открытое акционерное общество "Татнефть" им. В.Д. Шашина
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Priority to RU2005120674/03A priority Critical patent/RU2283947C1/en
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Publication of RU2283947C1 publication Critical patent/RU2283947C1/en

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Abstract

FIELD: oil production, particularly enhanced recovery methods for obtaining hydrocarbons.
SUBSTANCE: method involves drilling main horizontal or inclined conveying bore in productive reservoir roof part; drilling descending additional branch bores from the main one so that additional bore bottoms extend towards main conveying bore bottom. Height of horizontal part of the last additional branch bore is selected from ratio of distance between bore bottom and oil-water contact to distance between main conveying bore and oil-water contact, wherein the ratio is to be equal to 0.6-0.8. Height of horizontal section of additional branch descending bore is selected from ratio of distance between bore bottom and oil-water contact to distance between main conveying bore bottom and oil-water contact, wherein above ratio is to be equal to 0.1-0.2. Heights of horizontal sections of additional branch bores located between the first and the last bores are selected from ratio of distance between bore bottom and oil-water contact to distance between main horizontal bore and oil-water contact, wherein the ratio is to be equal to 0.2-0.6. Then the wells are brought into operation for oil production. In the case of increased water content in produced oil because of oil-water interface elevation watered descending bores are put out of well operation.
EFFECT: increased oil recovery.
1 ex, 1 dwg

Description

The present invention relates to the oil industry and may find application in the development of oil deposits by horizontal wells.
A known method of developing an oil field, including drilling a field with a horizontal wellbore system, injecting a displacing agent through injection wells and producing oil through production wells. Additionally, drainage wells with horizontal shafts are carried out, they are placed at the bottom of the gas-pressure field or in the roof of the field with a water-pressure mode, while the horizontal well system has intersecting or intersecting trunks in plan view, and production wells are hydrodynamically connected to the intersection of horizontal drainage well shafts, injection of the displacing agent is carried out in the roof of the field in gas pressure mode or in the bottom of the field in water pressure mode (Paten t of the Russian Federation No. 1623276, class E 21 B 43/20, publ. 1999.11.11.27).
The known method does not allow to develop an oil reservoir with high oil recovery due to the rapid flooding of the produced products with rising cones of flooding.
Closest to the proposed invention in technical essence is a method of developing an oil reservoir by horizontal wells, including conducting a main horizontal transport well in the well, flow metering along its entire length from its bottom to the top of the formation, using the flow meter to find working sections adjacent to the main horizontal horizontal well formation and idle sections of the formation, then from the main horizontal transport trunk to idle sections of the formation b erasure of branched descending trunks of a wave-like profile, flow metering in them, identification of working sections of a formation adjacent to a branched descending trunks of a wave-like profile, drilling of subsequent horizontal trunks and additional branched descending trunks in working sections of a formation from a main transport horizontal wellbore, including wells in oil production , while the inclusion of additional branched descending shafts in each well in the oil production after efficiently, starting from the bottom of the main horizontal transport trunk to the roof of the formation (RF Patent No. 2141560, cl. E 21 B 43/00, publ. 11.20.1999 - prototype).
The known method allows you to select the main oil reserves from the reservoir, however, the oil recovery remains low due to the premature rise of bottom water cones to the faces of production wells.
The proposed invention solves the problem of increasing oil recovery deposits.
The problem is solved in that in the method of developing an oil reservoir by horizontal wells, including wiring a main horizontal transport well in the well, drilling from the main horizontal transport well additional branched descending shafts into the working sections of the formation and including wells in the oil production operation, according to the invention, the main horizontal transport the trunk is drilled horizontally or obliquely in the roofing of the reservoir, additional branched descending trunk We drill with lowering their faces to the end of the main horizontal transport trunk, the height of the horizontal part of the last additional branching descending trunk is determined based on the ratio of the distance from the main bottom of the trunk to the oil-water contact to the distance from the main horizontal transport trunk to the oil-water contact of 0.6-0, 8, the height of the horizontal part of the first additional branching descending trunk is determined based on the ratio of the distance from the bottom of the trunk to the oil-water contact to the distance from the main transport horizontal trunk to the oil-water contact, equal to 0.1-0.2, the height of the horizontal parts of the additional branched falling trunks in the interval between the first and last trunk is determined based on the ratio of the distance from the bottom of the trunk to the oil-water contact to the distance from the main transport horizontal the well to the oil-water contact equal to 0.2-0.6, while watering the produced oil by raising the cones of watering exclude waterlogged wells from the well giving trunks.
The features of the invention are:
1. wiring in the well of the main transport horizontal wellbore;
2. drilling from the main horizontal transport trunk of additional branched descending trunks into the working sections of the formation;
3. inclusion of wells in oil production;
4. drilling of the main transport horizontal trunk horizontally or inclined in the roofing of the reservoir;
5. drilling additional branched descending trunks with lowering their faces to the end of the main horizontal transport trunk;
6. assignment of the height of the horizontal part of the last additional branching descending trunk based on the ratio of the distance from the bottom of the trunk to the oil-water contact to the distance from the main transport horizontal trunk to the oil-water contact of 0.6-0.8;
7. assignment of the height of the horizontal part of the first additional branching descending trunk based on the ratio of the distance from the bottom of the trunk to the oil-water contact to the distance from the main horizontal transport trunk to the oil-water contact equal to 0.1-0.2;
8. assignment of heights of horizontal parts of additional branched descending trunks in the interval between the first and last trunk based on the ratio of the distance from the bottom of the trunk to the oil-water contact to the distance from the main horizontal transport trunk to the oil-water contact equal to 0.2-0.6;
9. When watering the produced oil by raising the cones of watering, waterlogged flowing trunks are excluded from the operation of the well.
Signs 1-3 are common with the prototype, signs 4-9 are the salient features of the invention.
SUMMARY OF THE INVENTION
When developing an oil reservoir with bottom water, water cones are raised to the faces of production wells. As a result of this, waterlogging of produced products, burial of a part of recoverable reserves in the reservoir and a decrease in the final oil recovery of the reservoir occur. A particularly strong negative effect of this kind manifests itself when lifting the cones to horizontal producing wells. The proposed method solves the problem of increasing oil recovery by reducing the effect of cone formation and premature flooding of horizontal production wells.
The drawing schematically shows a section of the reservoir.
In the reservoir 1 in the roofing part, the main horizontal transport shaft 2 is drilled horizontally or obliquely (in this case, obliquely). Additional branched descending trunks 3-6 are drilled from it with a decrease in their faces towards the end of the main transport horizontal trunk 2.
The height of the horizontal part h 1-6 of the last (fourth) additional branched descending barrel 6 is determined based on the ratio of the distance from the bottom of the barrel 7 to the oil-water contact 8 h 2-6 to the distance from the main transport horizontal barrel 2 to the oil-water contact 8 h 1-6 + h 2-6 , equal to 0.6-0.8.
h 1-6 / (h 1-6 + h 2-6 ) = 0.6-0.8
The height of the horizontal part h 1-3 of the first additional branching falling shaft 3 is determined based on the ratio of the distance from the bottom of the barrel 9 to the oil-water contact 8 h 2-3 to the distance from the main transport horizontal barrel 2 to the oil-water contact 8 h 1-3 + h 2- 3 , equal to 0.1-0.2.
H 1-3 / (h 1-3 + h 2-3 ) = 0.1-0.2
The height of the horizontal part h 1-4 of the second additional branching falling shaft 4 is determined based on the ratio of the distance from the bottom of the barrel 10 to the oil-water contact 8 h 2-4 to the distance from the main transport horizontal barrel 2 to the oil-water contact 8 h 1-4 + h 2- 4 , equal to 0.2-0.4.
h 1-4 / (h 1-4 + h 2-4 ) = 0.2-0.4
The height of the horizontal part h 1-5 of the third additional drop-down trunk 5 is determined based on the ratio of the distance from the bottom of the barrel 11 to the oil-water contact 8 h 2-5 to the distance from the main transport horizontal barrel 2 to the oil-water contact 8 h 1-5 + h 2- 5 , equal to 0.4-0.6.
h 1-5 / (h 1-5 + h 2-5 ) = 0.4-0.6
Waterflooding of the reservoir is conducted through injection wells (not shown). Oil is taken through production wells, including through the well shown in the drawing. The selection of oil is carried out not only through an additional branch drop-down trunk, but also through the main transport horizontal trunk. Depending on the properties of the formation, the well is cased or not.
As a result of the raising of the water cones, the flooding of the faces of all the additional branched descending trunks occurs more evenly. The main rise of the watering cone occurs near the main wellbore (vertical) of the well. Therefore, the face of the first additional branched drop-down trunk is raised above the rest. When watering additional branched descending trunks, they are isolated, for example, by cementing.
An example of a specific implementation of the method
An oil reservoir of the Romashkinskoye field is developed with the following characteristics: the average depth is 892 m, the type of deposit is massive, the reservoir is carbonate, the average total thickness is 22 m, the average effective oil saturated thickness is 8.8 m, the porosity is 0.141, and the average oil saturation is 0.79, permeability - 0.145 μm 2 , reservoir temperature - 23 ° C, reservoir pressure - 7.4 MPa, oil viscosity at reservoir conditions - 52.9 MPa · s, oil density at reservoir conditions - 0.884 t / m 3 , the pressure of oil saturation with gas is 1.3 MPa, the gas content of oil is 4.7 m 3 / t, water viscosity in reservoir conditions - 1.1 MPa · s, water density - 1.036 kg / m 3 .
The deposit is being developed by flooding. The working agent is pumped through injection wells and oil is taken through production wells.
In the reservoir 1 at a distance of 2 m from the roof, the main horizontal transport trunk 2 300 m long is drilled horizontally. Additional branched descending trunks 3-6 are drilled from it, 3-6 through 100 m each with a decrease in their faces to the end of the main horizontal transport trunk 2.
The height of the horizontal part h 1-6 of the last (fourth) additional branched descending barrel 6 is determined based on the ratio of the distance from the bottom of the barrel 7 to the oil-water contact 8 h 2-6 to the distance from the main transport horizontal barrel 2 to the oil-water contact 8 h 1-6 + h 2-6 , equal to 0.6-0.8.
h 1-6 / (h 1-6 + h 2-6 ) = 14 / (14 + 6) = 0.7
The height of the horizontal part h 1-3 of the first additional branching falling shaft 3 is determined based on the ratio of the distance from the bottom of the barrel 9 to the oil-water contact 8 h 2-3 to the distance from the main transport horizontal barrel 2 to the oil-water contact 8 h 1-3 + h 2- 3 , equal to 0.1-0.2.
h 1-3 / (h 1-3 + h 2-3 ) = 3 / (3 + 17) = 0.15
The height of the horizontal part h 1-4 of the second additional branching falling shaft 4 is determined based on the ratio of the distance from the bottom of the barrel 10 to the oil-water contact 8 h 2-4 to the distance from the main transport horizontal barrel 2 to the oil-water contact 8 h 1-4 + h 2- 4 , equal to 0.2-0.4.
h 1-4 / (h 1-4 + h 2-4 ) = 6 / (6 + 14) = 0.3
The height of the horizontal part h 1-5 of the third additional drop-down trunk 5 is determined based on the ratio of the distance from the bottom of the barrel 11 to the oil-water contact 8 h 2-5 to the distance from the main transport horizontal barrel 2 to the oil-water contact 8 h 1-5 + h 2- 5 , equal to 0.4-0.6.
h 1-5 / (h 1-5 + h 2-5 ) = 10 / (10 + 10) = 0.5
As a result of the raising of the water cones, the flooding of the faces of all the additional branched descending trunks occurs more evenly. When watering the produced oil by raising the watering cones, waterlogged flowing trunks are excluded from the operation of the well. As a result, the anhydrous period of oil production was 1.5 years instead of 1 year, as in horizontal wells of a similar type (according to the prototype). The oil recovery of the deposit section was 48%, while the estimated oil recovery for the section with a well of the same type (according to the prototype) is 40%.
The application of the proposed method will improve oil recovery deposits.

Claims (1)

  1. A method for developing an oil reservoir by horizontal wells, including wiring a main horizontal transport well in the well, drilling additional branched descending trunks from the main horizontal transport well into working sections of the formation, including the well in oil production, characterized in that the main horizontal transport well is drilled horizontally or obliquely in the roofing of the reservoir, additional branched descending trunks are drilled with a decrease in their bottom ev to the end of the main horizontal transport trunk, the height of the horizontal part of the last additional branching descending trunk is assigned based on the ratio of the distance from the bottom of the trunk to the oil-water contact to the distance from the main horizontal transport to the oil-water contact of 0.6-0.8, the horizontal height parts of the first additional branching descending trunk are assigned based on the ratio of the distance from the bottom of the trunk to the oil-water contact to the distance from the main horizontal transport trunk to the oil-water contact equal to 0.1-0.2, the height of the horizontal parts of additional branched descending trunks in the interval between the first and last trunk is determined based on the ratio of the distance from the bottom of the trunk to the oil-water contact to the distance from the main transport horizontal trunk to water-oil contact equal to 0.2-0.6, while watering the produced oil by raising the cones of watering exclude flooded flowing trunks from the well.
RU2005120674/03A 2005-07-04 2005-07-04 Method for oil pool development with horizontal wells RU2283947C1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101956548A (en) * 2010-09-25 2011-01-26 北京奥瑞安能源技术开发有限公司 Coal bed methane multi-branch horizontal well system and modification method thereof
CN102979498A (en) * 2012-11-12 2013-03-20 中国石油天然气股份有限公司 Coal-bed gas multi-branch horizontal-well system
RU2488690C1 (en) * 2012-01-27 2013-07-27 Открытое акционерное общество "Татнефть" имени В.Д. Шашина Development method of oil deposits with horizontal wells
CN103867124A (en) * 2013-05-31 2014-06-18 华北石油管理局 CBM (Coal-Bed Methane) multi-branch horizontal well system suitable for uniclinal structure

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101956548A (en) * 2010-09-25 2011-01-26 北京奥瑞安能源技术开发有限公司 Coal bed methane multi-branch horizontal well system and modification method thereof
CN101956548B (en) * 2010-09-25 2013-05-08 北京奥瑞安能源技术开发有限公司 Coal bed methane multi-branch horizontal well system and modification method thereof
RU2488690C1 (en) * 2012-01-27 2013-07-27 Открытое акционерное общество "Татнефть" имени В.Д. Шашина Development method of oil deposits with horizontal wells
CN102979498A (en) * 2012-11-12 2013-03-20 中国石油天然气股份有限公司 Coal-bed gas multi-branch horizontal-well system
CN102979498B (en) * 2012-11-12 2016-01-20 中国石油天然气股份有限公司 A kind of multi-lateral horizontal well system for coal bed gas
CN103867124A (en) * 2013-05-31 2014-06-18 华北石油管理局 CBM (Coal-Bed Methane) multi-branch horizontal well system suitable for uniclinal structure
CN103867124B (en) * 2013-05-31 2015-12-09 华北石油管理局 A kind of multi-lateral horizontal well system for coal bed gas being applicable to monoclinal structure

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Effective date: 20120705