The method of producing the multilayer deposits at a later stage
The invention relates to the field of the oil industry, and in particular to methods of developing multilayer oil fields. Provides the most complete development of each layer of one well. The inventive method provides for the drilling of injection and production wells, injection of the displacing fluid injection and sampling of product formation via the production well. In the drilling process to expose the upper part of the clays, which are prone to shattering and swelling. Then drilled part of the well is fixed by the descent of the production string. Then continue drilling a bit smaller diameter and open fully productive layer of mud on the balance or depression with the aim of preserving the reservoir properties of the formation. In the process of drilling lowered below the production casing to determine the profitability of the layers operate gas logs. According to the results of the logging and analysis of sludge conclude a cease drilling or further deepening. If the reservoir profitable, you develop an open bottom with filling it with coarse sand. After full development of the reservoir and holding the e underlying layers. If the walls of productive formations are prone to shedding, they overlap profile perekryvatel or shank of legkousvojaemogo material. 1 C.p. f-crystals, 1 Il.
The invention relates to the field of oil and gas industry, and in particular to methods of developing multilayer oil fields in the late stages of development.
There is a method of developing multilayer oil field , which includes drilling injection and production wells, injection of the displacing fluid into the injection well and the selection of products from combined into a single production facility several productive strata.
The disadvantage of this method, as correctly noted by the authors of the source of information , is that it is not possible to involve in active development of the reserves of all of the layers, as it developed only high-permeability layers or portions that fall on the line of cutting. In addition, due to the heterogeneity of the reservoir is impossible to develop water injection all formations opened injection wells.
These shortcomings are corrected in the way of developing multilayer oil field , including drilling nagassarium injection of the displacing fluid separately in each layer through one injection well and separate the selection of several oil sucker-rod pumps from each reservoir through one production well.
Not begging advantages of this method note that it has several shortcomings. Is it that it requires a descent of two parallel columns, consistent with their descent there is a risk of jamming and tightening. And 5’ production string, the application of parallel rows of tubes is not possible, this leads to the complication of ground equipment wells due to the need to install on the mouth 2 sets of wellhead equipment at a close distance, tripping, lifting of a number of parallel tubes increase the complexity of the work and underground repair of wells.
Due to the lack of reliable pakiruumi devices, as well as reliable surface and subsurface well equipment, the method has limited application.
This way the technical nature closer to the offer and may be accepted as a prototype because it provides the most complete development of each layer of one well.
However, an additional disadvantage of the prototype is that productive formations at autopsy, drilling, and when the fastening bore heavily polluted due to falling down of the drilling fluid and filtrate, and the products of hydration of cement,current products in development. At the late stage development of highly productive reservoirs are the most developed. At the opening of the perforation receive water-saturated products.
In addition, in the continuous development of the lower water-saturated layer of the wall of the production string almost the entire length is subjected to physical wear and tear due to aggressive products and round-trip operations in the implementation of various technological and repair works.
The present invention is to eliminate the above drawbacks of the prototype.
The problem is solved by the described method, including drilling injection and production wells, injection of the displacing fluid injection and sampling of product formation via the production well.
What's new is that the drilling reveal geological cross-section to the roof of the reservoir, located in the upper part of the section clays prone to shedding and swelling. Drilled part of the well is fixed by the descent of the production string. Then continue drilling to deepen a bit smaller in diameter to the full drilling (see drawing). With its open using a solution of Ravnopravie to its full output. After complete development of the reservoir is isolated highly permeable insulating compounds, such as swollen polymers, and cement. Next, a similar pattern drilling reveal and develop consistently the rest of the underlying oil-bearing stratum. After forming these layers by drilling reveal highly permeable water reservoir and well grow shank, fixed, after which they develop separately.
The method is distinguished by the fact that if uncovered the reservoir is prone to shattering, prior to the selection of oil it fix the filling of coarse-grained quartz sand or block profile perekryvatel, legkorazmyvaemykh shank (for example, aluminum, fiberglass or other material). If the two adjacent a productive formation of uniform permeability and are composed of hard rock, they have been jointly developing an open face.
The method is distinguished by the fact that in the process of drilling below are lowered and cemented columns carry out geophysical monitoring getcaretpos party and the results of the research determine the cessation of drilling or further deepening.
Prive well - 1 (№№1, 2, 3, 4). After opening the drilling of the upper part of the clay up to the roof of the productive formation produce the descent of the production casing and cementing. Further drilling will continue to deepen a bit smaller diameter to complete the drilling. In terms of clay - 3 lies reservoir. Above the cut clay overlain by carbonate rocks - 2. The reservoir in the upper part of the saturated oil - 4, and the bottom watered injected water - 5. In the drawing, the stack of layers is divided into 3 interlayer. In wells No. 1, 2 operational column - 6 perforated - 8, reservoir operated by the General filter. Due to the fact that reservoir properties (porosity, permeability) of the underlying layers is much better than the underlying layers, so these highly productive layers of highly vraboteni and flooding injected water - 5. Unproductive strata were not involved in the development of low collectorsa properties and imperfections in the opening. Well # 3 was drilled by the proposed method, where the upper part of the clay-lined production column - 6 and cemented.
First opened the reservoir in terms of clays developed as an open face the productive stratum Daboutafter complete development of the insulated swollen polymer composition 10 and after fixing with cement mortar the bottom hole dredged to a bottom part below the reservoir.
These reservoirs as a cost-effective and due to the homogeneity permeable and composed of solid rocks taken to operate an open bottom at the same time.
Clays have the ability to swell and crumble. Therefore, they must be open to high-quality clay, obsahovat the production column and cement.
The method is carried out in the following sequence.
Oil field razvarivat project net production and injection wells, and then carry out its infrastructure. After opening the drilling of the upper part of the clay up to the roof of the productive formation produce the descent of the production casing and cementing. Further drilling will continue to delve a bit smaller diameter to complete the drilling.
For the preservation of reservoir properties reservoir opening his conduct drilling mud balance or depression.
In the process of drilling below are lowered production casing carried out geophysical co is ukrasheniya drilling or further deepening.
In the case of profitability development of the reservoir oil extraction carried out through the open bottom with filling it with coarse sand. If exposed layer is exposed to falling, then its block, flat shank of legkousvojaemogo material (such as fiberglass, aluminum or other material). After complete development of the productive formation and implementation of insulation works by drilling on a similar scheme consistently reveal and develop other underlying layers and the stack of layers. Insulation work is carried out by injection of high-permeability of the composition, such as swollen polymer, followed by cementing. After forming these layers by drilling reveal highly permeable water reservoir and well grow shank, cement, after which they develop separately.
1. Book R. H. Muslimov, A. M. Savelieva, R. B. chisamba and other “Geology, development and exploitation of Romashkinskoye oil field”, Moscow, VNIIEM, 1995, volume 2, S. 243-244.
2. The book “separate Simultaneous operation of multiple zone oil fields”, in “the Depths”, M. 1974, S. 83, authors: R. A. Maksutov, B. E. Dobroskok, Y. C. hares.
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.
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.
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.
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