The way to develop oil deposits

 

(57) Abstract:

The invention relates to the oil industry and will find application in the development of oil and water reservoirs, reservoir containing aquifer zone. Improves the efficiency of the method and cost savings. The inventive method involves drilling deposits on the project grid, a division of wells in categories, depending on the thickness of the transition zone or impermeable interlayer in the reservoir. Well, related to the first category with the thickness of the transition zone or impermeable interlayer up to 1.5 m, is used as an injection. Well the second category have a thickness of 1.5-3 m Wells third category - a thickness of more than 3 meters These wells are used as mining. Open the reservoir perforation. According to the invention in the wells of the second category with the thickness of the transition zone or impermeable interlayer 1.5-3 m before operation as extractive create a waterproof screen aquifer in parts of oil-water reservoir beneath the transition zone or impermeable interlayer thickness, the total value of which, together with a transition zone or impermeable pays Sneem boring or hydro-mechanical perforators.

The invention relates to the oil industry and will find application in the development of oil-water deposits.

There is a method of developing oil-water deposits, including a shot of oil-bearing and water-bearing parts of oil-water reservoir, the use of submersible equipment installed in the borehole opposite the productive formation and ensure creation of them at certain times of the so-called "reverse" of the cone, in which there is movement of two-phase fluid in the stalk zone of the reservoir top to bottom, and separate the cyclic pumping of oil and water on the surface (1).

The disadvantages of the method are:

- the need for secondary opening part of the aquifer formation and application of advanced for this special downhole equipment that is costly;

when the secondary opening part of the aquifer cumulative punches is the destruction of the lining of wells;

- not achieved a significant reduction in the production of associated water, consequently limited its application.

The closest in technical essence to the present invention is a method of developing oil-water deposits, including the or impermeable interlayer in the reservoir and, depending on this, their assignment to assignment to injection or production and the opening of a productive layer perforation (2).

The method has found particular application in the oil fields, but during operation it was found that the wells of the second and third categories, respectively having the transition zone or impermeable interlayer 1.5-3 m and 3 m, or were prematurely oboznalis, or operated with a high content of produced water, which is forced to hold in subsequent complex repair and insulation works, leading to huge costs.

The objective of the invention is to increase the efficiency of development of oil-water deposits and saving material costs.

This problem is solved by the proposed method, including the drilling of deposits on the project grid, a division of wells in categories, depending on the thickness of the transition zone or impermeable interlayer in the reservoir and, depending on this, their assignment to assignment to injection or production, and it is well related to the first category with the thickness of the transition zone or impermeable interlayer up to 1.5 m, is used as an injection,mining, the opening of the productive formation perforation.

What's new is that in the wells of the second category with the thickness of the transition zone or impermeable interlayer 1.5-3 m before operation as extractive create a waterproof screen aquifer in parts of oil-water reservoir beneath the transition zone or impermeable interlayer thickness, the total value of which, together with a transition zone or impermeable interlayer is within 5 m, and the oil-bearing part of the reservoir in the wells of the second and third categories reveal in a sparing mode.

The method is carried out in the following sequence.

Water oil Deposit razvarivat wells on the project grid. In the process of drilling oil-water zone geophysical methods, coring, test wells, etc. determine the thickness and properties of the transition zone, the thickness of the impermeable interlayer between oil-bearing and water-bearing parts of the reservoir, their areal distribution, the impact of these indicators on watering products and others On the basis of this information, all wells are divided into three categories, namely, wells with thickness of the transition zone or impermeable seams to 1.5 attributed to the hydrated for the operation of the flow rate due to high water cut. Wells with thickness of 1.5-3 m and 3 m refer respectively to the second and third categories and use them as mining.

A special feature of this method is that in the wells of the second category before operation creates a waterproof screen in part of the aquifer directly beneath the transition zone or impermeable seams.

This work is as follows.

After mounting holes (the slope of the production casing, cementing, waiting hardening cement) reveal perforated water-bearing part of the reservoir under the transition zone or impermeable interlayer of the calculation that the total thickness of the transition zone or impermeable seams plus perforated thickness of the layer was approximately 5 m this value is dictated by the requirement allowable differential pressure for 1 peg. m cement rings equal to 2.0 MPa, and the depression in the reservoir during operation within 8,0-9,0 MPa. For example, if a transition zone or impermeable interlayer equal to 2 m, the bearing portion is perforated in the interval 3 m

Then go down the column tubing and wash out the bottom hole, determine priemus liner and so on) create a screen-bearing part of the reservoir. The radius of the screen are determined by calculation based on the reservoir properties of the formation, the thickness of the perforated interval, and so on

Then the pumping of the cement slurry set the bridge in front of the filter part of the aquifer formation.

After hardening of the cement slurry oil-bearing part of the reservoir reveal punches in a sparing mode: drilling, hydro-mechanical method (PGM-146, PGM-168).

In wells the third category of oil-bearing part of the reservoir is opened in the range of 0.5-0.6 part of its thickness in a sparing mode using boring or hydromechanical punchers.

After performing these works wells put into operation.

Technical appraisal and economic benefits of the proposed method lies in the fact that, thanks to the smooth bind specific geological and technical measures to wells of different categories of oil-water deposits, increases the efficiency of its development, as expressed in the optimal mode of operation of wells with a minimum level of water extraction and resulting in significant savings of material resources.

Used information

Analogue. Insulation works the completion and operation of the security transition zone and its influence on the development of higher // oil. the ec.. - 1983. - 10. - S. 31-34.

The way to develop oil-water deposits, including the drilling of its project on the net, a division of wells in categories, depending on the thickness of the transition zone or impermeable interlayer in the reservoir and, depending on this, their assignment to assignment to injection or production, namely, wells belonging to the first category with the thickness of the transition zone or impermeable interlayer up to 1.5 m, is used as injection wells of the second category with a thickness of 1.5-3 m and wells of the third category with a thickness of more than 3 m is used as extracting and opening of a productive layer perforation, characterized in that in the wells of the second category with the thickness of the transition zone or impermeable interlayer 1.5-3 m before operation as extractive create a waterproof screen aquifer in parts of oil-water reservoir beneath the transition zone or impermeable interlayer thickness, the total value of which, together with a transition zone or impermeable interlayer is within 5 m, and the oil-bearing part of the reservoir in the wells of the second and third categories reveal in a sparing mode using boring or hydromechanical the

 

Same patents:

The invention relates to the field of the oil industry, and in particular to methods of development of oil fields with heterogeneous permeability layers using physico-chemical methods of enhanced oil recovery
The invention relates to the oil industry and can find application in the development of oil reservoirs with high water content oil
The invention relates to the oil industry and can find application in the development of the multilayer oil deposits

The invention relates to the oil industry, in particular to methods for development of massive oil deposits that have zatrudnieniu hydrodynamic connection with its underlying water-saturated rocks, developed with the injection of the displacing agents to maintain reservoir pressure, improves the efficiency of the development of massive oil deposits, the selection of the liquid from which it is not compensated formation water

The invention relates to the oil industry, and in particular to compositions for the treatment of an oil reservoir to increase oil recovery

The invention relates to the oil industry, in particular to the development of oil fields, and can be used for reservoir pressure maintenance by water injection and for injection into the reagent reservoir to increase oil recovery
The invention relates to the oil industry and can find application in the development of high-viscosity oil pools
The invention relates to the field of development of oil fields and may find application in the development of irrigated oil deposits
The invention relates to the oil industry and can find application in the development of reservoirs with bottom water

FIELD: oil and gas production.

SUBSTANCE: groups of high intake- and low intake-capacity injecting wells are chosen in a single hydrodynamic system and, for each well, oil reservoir properties and permissible degree of pollution of fluid received by high intake-capacity wells are determined. When fluid from low-permeable oil reservoir flows off through high intake-capacity wells, this fluid is cleaned to permissible degree of pollution.

EFFECT: reduced losses in intake capacity of formations and increased time between treatments of wells.

1 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes construction of wells and oil and gas collection system, forcing water from water-bearing level into oil deposits, flow of oil from oil deposits into secondary deposit and following extraction of oil from secondary deposit for useful implementation. Resources of deposit are separated on basis of natural energy characteristic on screened and having rigid water-forcing mode. Deposit is operated by three well types. Of the latter flow wells connect oil deposits to secondary deposit for flowing and collection of oil in upper bed under effect from gravitation. Balancing wells connect screened deposits and secondary deposit to water-forcing level for balancing of bed pressures and preventing loss of rocks stability. Extraction wells connect secondary deposit to oil and gas collection system. Selection of bed for secondary deposit is performed from number of highly penetrable beds, having maximally allowed excess over oil deposits.

EFFECT: higher oil yield, higher effectiveness.

5 cl, 3 dwg

FIELD: oil extractive industry.

SUBSTANCE: method includes drilling of deposit according to row-wise non-even grid of wells with distance from force to extractive rows, greater than distance between extractive rows, pumping of displacing gent into force wells, extraction of product from product wells and transferring of displacing agent pumping front to extraction area. According to invention, transferring of displacing agent pumping front to extraction area is performed by drilling side horizontal shafts in all wells of force row and directed towards extractive row by beds ad zones with most remainder oil saturation level. Then among these wells are singled out, horizontal shafts of which pass along beds and areas with lesser oil saturation level. Pumping of displacing agent is restarted, and other wells are transferred to product category. These wells are operated with face pressures lower than saturation pressure until reaching 98% water saturation level. After that pumping of displacing agent is restarted along all other wells of force row. During that, rows of extractive wells are operated in normal mode.

EFFECT: higher efficiency.

1 ex

FIELD: oil industry.

SUBSTANCE: according to first variant of method, force and product wells are drilled, working agent is fed through force wells, oil is extracted through product wells, dome-like raised portions are marked out, which surpass absolute marks of bed, additional wells are positioned in these portions. Wells placement is planned at tops of dome-like raised portions even with breach of evenness of planned well mesh. After full drilling of wells mesh and in case of more accurate definition according to data of drilled wells of deposit of dome-like portions side shafts are drilled from adjacent wells towards more precisely defined tops of dome-like portions, controlling the deposit. In adjacent wells and side shafts, positioned on tops of dome-like raised portions , range of productive bed is opened between absolute mark of ceiling in this well and absolute mark, appropriate for ceiling in closest well. According to second variant of method practically analogical operations are realized as in first variant, except when absolute mark of ceiling of productive bed according to adjacent wells is lower than mark of sole of productive bed, whole bed is opened in side shafts.

EFFECT: higher efficiency.

2 cl, 2 dwg

FIELD: oil reservoir development, particularly for developing water-flooded ones.

SUBSTANCE: method involves withdrawing oil through production wells and ejecting working substance through ejection wells. To prevent water ingress from well bore into oil-saturated formation area formation is perforated in water-oil interface zone so that lower part of oil-saturation formation interval and upper part of water-flooded formation interval are penetrated. This provides oil relative permeability retention in oil-saturated formation area. To prevent formation mudding during initial perforation thereof drilling is performed in depression, balance and repression modes with pressure of not more than 3 MPa. As far as oil is depleted perforation interval is extended towards oil-saturated formation area.

EFFECT: possibility to retain oil relative permeability of oil-saturated formation area.

2 cl, 2 dwg

FIELD: oil field development, particularly for ones with nonuniform reservoirs.

SUBSTANCE: method involves drilling injection and production wells; flooding oil reservoir and extracting oil out of well; defining more exactly geologic aspects on the base of drilling results; designing and drilling additional wells with horizontal bores or drilling horizontal bores from existent wells; determining location of reservoir drive zone boundaries; calculating volume of dead oil located near drive zones; drilling horizontal bores from existent wells located near drive zones and/or new wells with horizontal bores located in above zone, wherein horizontal bores are drilled in direction perpendicular to drive zone boundaries.

EFFECT: improved oil recovery.

2 dwg, 1 ex

FIELD: oil industry.

SUBSTANCE: method includes drilling vertical product and force wells, extracting oil from product wells, forcing working agent through force wells, making side horizontal shafts in force wells, forcing working agent through side horizontal shafts of force wells. Additionally, side horizontal shafts are made in extraction wells. Oil is taken through side horizontal shafts of extractive wells. With pressure in the well, decreased for 5-10% from hydrostatic pressure, all side horizontal shafts are made by washing away rock under pressure of fluid of around 15-20 mPa. Direction of all side horizontal shafts is set to be parallel to rows of wells.

EFFECT: higher oil yield.

1 ex, 1 dwg

FIELD: oil production industry, particularly enhanced recovery methods for obtaining hydrocarbons.

SUBSTANCE: method involves drilling production and injection wells and maintaining formation pressure; performing seismic works to determine volumetric routing of natural macrocrack system with lateral and depth routing; forming production and injection macrocracks of above system; drilling wells to corresponding macrocracks and forming producing well-macrocrack systems for oil production and injection well-macrocrack for formation flooding or production well-macrocrack for oil production and system including vertical and/or horizontal multibranch wells for formation flooding or injection well-macrocrack system for formation flooding and system including vertical and/or horizontal multibranch production wells for oil production or production well-macrocrack system, injection well-macrocrack system and system including vertical and/or horizontal multibranch production and injection wells.

EFFECT: increased efficiency, oil recovery and production well injectivity, as well as increased sweep efficiency and oil recovery ratio.

1 dwg

FIELD: oil production industry, particularly oil deposit development.

SUBSTANCE: method involves pumping working agent, namely water, in two stages. The first stage is performed with the use of power pumps. The second one is carried out by means of hydraulic measuring pumps, which are used to convert injection pressure created by power pumps. If it is necessary to increase pressure in water lines used to deliver water to separate injection wells pressure is regulated in accordance with necessary water volume to be injected in wells on the base of collecting properties of oil formations in bottomhole formation zones. This is performed by providing change in pump piston diameter and stroke ratios in the first and the second sections of hydraulic measuring pumps, which are selected on the base of hydraulic resistance variation depending on water flow velocity. Parameters characterizing injection system operation are simultaneously measured and efficiency of the method and equipment operation is detected from above characteristics.

EFFECT: increased efficiency of oil bed development due to energy-saving equipment and technique usage for formation pressure maintaining.

2 cl, 2 dwg

FIELD: enhanced recovery methods for obtaining hydrocarbons.

SUBSTANCE: method involves flooding production bed through injection wells with the use of pump units. In the case of terrigenous porous productive bed flooding acoustical sound resonators with resonance frequency setting are installed in injection line. This eliminates amplitude of alternating low-frequency liquid pulsation sound generated by pump units. Method also involves providing constant compression mode in productive beds and frontal oil drive from productive bed.

EFFECT: increased operational reliability.

1 ex, 3 dwg

Up!