The alignment profile injectivity of injection wells
(57) Abstract:The invention relates to the field of oil and can be used to align the profile of the injection well. Improves the efficiency of the alignment of the profile injectivity of injection wells in fractured reservoirs. The inventive determine the fluid properties of the reservoir. Into the formation water, Sadko - and/or gel-forming compositions having voting penetrating power. According to the invention on the results of well tests to determine the volume of cracks in the bottomhole formation zone. Into the formation cement mortar with plasticizers and fluid loss to the extent that the filling of cracks in the bottomhole formation zone, and reducing the intake capacity not exceeding 300 m3/day. The injection of water compositions performed at a pressure of 11 MPa after curing of the cement slurry. The invention relates to the field of oil production and is intended to align the profile of the injection well.There is a method of alignment of the profile of injection wells, including the definition foroudi Sadko - and/or gel-forming compositions, selectively penetrating into the layers .The effectiveness of the method significantly decreases in the presence of cracks penetrating neftegazonosnye layers.The technical task of the invention is to increase the efficiency of the alignment of the profile of injection wells in fractured reservoirs.To solve the problem in the process of alignment of the profile of injection wells, including the determination of the filtration properties of the reservoir and the subsequent injection of water, Sadko - and/or gel-forming compositions having voting penetrating ability, the results of geophysical and hydrodynamic research to determine the volume of cracks in the bottomhole formation zone and into the formation cement mortar.In the preparation of cement mortar (if zatvorenii) enter plasticizers and fluid loss, which increases its mobility and penetrating properties.The amount of cement should provide for the filling of cracks in the bottomhole formation zone and the reduction of its pickup to the value not exceeding 300 m3/day.Sakac the ASS="ptx2">To implement the method according to the results of GIW (GIS) to determine the volume of cracks in the bottomhole formation zone and the injectivity profile.Prepare the cement slurry, which for crack isolation in the wellbore area requires about 2 - 8 m3. To increase and preserve the mobility of the cement during its preparation in the mixing water is injected chemical additives: plasticizers and fluid loss. As a plasticizer at temperatures up to 130°C tested and showed good results the following reagents, in wt.%: the sulfite yeast mash (RRT) - 0,1-1,0; condensed sulfite alcohol bard (kssb) - 0,1-0,7; ferrochromolignosulfonat (FHLS) - 0,2-0,6; polyphenol resin (PFLH) - 0.1 to 0.3; Aksel - 0,1-3,0; bichromate sodium and potassium - 0,3-1,0; sulfonic acid NP-1A (on THE-6-01-1816-75) - 0,075-0,15. To reduce water loss, you can use: aksil - 0,1-3,0; dextrin, modified starch (MK) - 0,2-1,5; gipan - 0,1-0,5; carboxymethylcellulose (CMC) is 0.5 to 2.0. It is established that a universal tool is Aksel.The injection of cement into the formation is performed via installed in the injection borehole column tubing with a packer. In the injection process, CEM is emistat decreased and did not exceed 300 m3/day.After the cement slurry displacement in the reservoir preservation pickup well leave under pressure during curing of the cement slurry. Then into the formation by any of the known technologies, by mixing aqueous solutions of reagents (compounds) in the mouth or in the reservoir, pumped water compositions, for example, viscoelastic gels and/or a polymer-dispersed and fibrous structures. The injection is carried out in a volume of 100-400 m3at a pressure of 11 MPa.Well kept on the formation of the gel (or sludge), and then spend hydrodynamic studies or GIS to assess changes in injectivity profile. If necessary insulation work can be repeated.On completion of the injection well into operation.The source of information1. RF patent № 2175053, MKI7E 21 IN 43/00, 1999. The alignment profile injectivity of injection wells, including the determination of the filtration properties of the reservoir with subsequent injection of water, Sadko - and/or gel-forming compositions having voting penetrating power, characterized in that according to the results of isrelatively and fluid loss in volume, ensure the filling of cracks in the bottomhole formation zone, and reducing the intake capacity not exceeding 300 m3/day, and the injection of water compositions performed at a pressure of 11 MPa after curing of the cement slurry.
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