Executing mechanism and method of implementation of this mechanism
SUBSTANCE: for actuation of said executing mechanism it is provided osmotic element. The osmotic element is placed into flow of fluid medium owing to which there is provided an effort and motion required for actuating executing mechanism on account of using the difference of values of osmotic pressure either between solution inside the osmotic element and external flow of fluid medium or in a layer containing this fluid medium relative to the said element. It results in corresponding displacement or adjustment of the valve, or regulating device, limiting inflow.
EFFECT: there is provided adjustment of process of reservoir drainage, consequently, water inflow into each section or into corresponding part of draining pipe is automatically regulated depending on amount of incoming water, owing to which water inflow is constantly maintained at minimal level.
10 cl, 2 dwg
The technical field to which the invention relates.
The present invention relates to a method and apparatus involving the use of the actuator, in particular an actuating mechanism driven by pressure and is designed to allow its use in combination with drainage pipes used in oil and/or gas from an oil and/or gas-bearing formation.
The level of technology
Drainage pipes relating to the aforesaid type, usually divided into separate sections, in which there is usually one or more devices limit the flow regulating the flow of oil or gas in the drainage pipe.
In the descriptions of invention to the U.S. patent nos 4821801, 4858691 and 4577691, as well as in the description of the invention to the patent of great Britain No. 2169018 disclosed the known device used in the extraction of oil or gas by means of a long horizontal or vertical wells. Such known devices include a perforated drainage pipe, equipped, for example, a filter that is positioned around the pipe and intended to prevent the flow inside the sand. The main disadvantage of the known devices of this type used in oil and/or gas in high-permeability geological fo is Mariah, is that the pressure in the drain pipe increases exponentially upstream as a result of friction of the thread, resulting in a drainage pipe. In connection with the reduction of the pressure differential between the reservoir and the drainage pipe as it moves upstream correspondingly reduced and also the amount of oil and/or gas from the reservoir into the drain pipe. Thus, the application of this technical solution will be a corresponding decrease in the total number produced when oil and/or gas. Thus, there is a serious danger of the formation of cone irrigation in areas of shallow low-viscosity oil in the high-permeability geological formations, i.e. the undesirable flow of water or gas in the drainage pipe downstream, where the flow rate of oil from the reservoir to the pipeline reaches its highest value. Therefore, to avoid the formation of such a cone watering will be necessary, respectively, to reduce the number of extracted oil.
Applying the method proposed by the Stinger, which is described in application No. 902544 in Norwegian patent, you can achieve better performance compared with the above-described known technical solutions. This method consists in the use of two drainage pipes: outer perforated Tr the least and the inner pipe (Stinger), not having a perforation and extending within the outer tube until the desired location. The profile of the pressure distribution and hence the performance by using the method proposed by the Stinger, will be slightly better than when using other known methods. However, when applying this method in areas of shallow low-viscosity oil having a high permeability, can also produce unwanted cone watering containing water or gas, which will result in decreased performance.
In the magazine "world of oil" (World Oil), t, No. 11 (11/91), p.23-78, describes how the separation of the drainage pipe into separate sections, each of which requires the presence of one or more restraining devices, preventing the flow of oil or gas made in the form of the corresponding clutch or throttle devices, with the possibility of their movement. However, this publication relates, generally, to methods of control over the flow of oil or gas in order to prevent the formation of water or gas breakthrough restrict the flow in pipe oil from areas upstream.
In the patent document WO-A-9208875 revealed horizontal pipe for oil or gas containing multiple productive zones, each of Kotor is x connected to the mixing chambers, having a larger inner diameter than the productive zone. In productive areas include the outer perforated pipe, which can be thought of as a filter. However, the sequence of the individual sections having different diameters, is unsuccessful as a result of the application of this sequence of sections of the flow inside the pipe becomes turbulent, and this represents an obstacle for the use of equipment, usually introduced into the pipe using a downhole tractors or spiral tubular systems.
The technology of horizontal drilling was known in 1920, but many still consider it and currently as innovative technologies. Over the last twenty years, continuously works on the preparation and opening of deposits through drilling of horizontal wells, carried out in a safe and effective way. Modern state of technology in this area is that the level of safety in drilling operations increases, the costs are approximately 50% higher compared to the costs for drilling of vertical wells, but horizontal wells provide three, four times larger volume of production, depending on the characteristics of the oil reservoir.
It has been demonstrated that horizontal wells are, from the points of view of the financing of the operations, kind of a kind of precondition for starting the operation of the respective fields, such as oil from geological formations, characterized by the presence of a low viscosity zone oil, high permeability and frequent undesirable watering due to the accumulation of water or gas breakthrough. It is expected that in the future horizontal wells will be much more likely to be used in the operation of small, using financial term is a marginal oil or gas fields.
In European patent No. 0588421, issued in the name of the applicant of the present invention, describes a method to improve the profile of the pressure in the drainage tube, beyond the known, described here above technical solutions, by imposing appropriate restrictions on the difference between the pressure in the reservoir and the pressure in the annular space outside of the drain pipe, and thereby balancing the pressure profile throughout the wellbore directly outside drain pipes. This is done through such arrangement of the respective devices that restrict the flow in each section of pipe, wherein the inlet of the said devices is connected with the annular space between the formation and drainage pipe or ring PR is a space, located between the filter and the drain pipe, and output their holes are connected with the corresponding compartment drain tube, inside of which flows. This technical solution provides for the use of appropriate devices that restrict the flow, which are in a fixed position (relative to the through-flow), which is a disadvantage.
Simultaneously with the development of drilling technology also became tougher and requirements for technology reservoir drainage. Currently known technologies drainage does not allow to obtain an acceptable technical solutions for regulating reservoir drainage taking into account the available water inflow from the reservoir.
Disclosure of inventions
The present invention allows to implement a technical solution that provides such regulation of the process of drainage of the reservoir, in which the flow of water in each section, or the appropriate area of the drainage pipe is automatically adjusted depending on the number of incoming water, allowing the entrance of water all the time is kept to a minimum.
The method proposed in accordance with the present invention, characterized in that actuation of the actuator used osmotic ele is UNT, placed in the fluid flow, thus ensuring the availability of forces and motion required to actuate the actuator through the use of the difference of the values of the osmotic pressure between the solution inside the element, and the external fluid flow or reservoir containing the fluid, relative to the specified element, resulting in a corresponding movement or the valve setting or adjusting device that restricts the flow, as indicated in paragraph 1 of the attached claims.
An independent claim relating to a device used in conjunction with the Executive mechanism proposed in accordance with the present invention according to the present invention, further characterized in that the actuator includes osmotic element, designed to allow its premises to the fluid flow, thus ensuring the availability of forces and motion required to actuate the actuator through the use of the difference of the values of the osmotic pressure between the solution inside the element, and the external fluid flow or reservoir containing the fluid environment, in relation to this is Lamento, resulting in corresponding movement or the valve setting or adjusting device that restricts the flow, as indicated in paragraph 4 of the attached claims.
In dependent clauses 2-3 and 5-9 of the claims specified characteristic, providing the respective advantages of the present invention.
Brief description of drawings
The following is a detailed description of the present invention conducted with reference to the accompanying drawings.
Figure 1 is a schematic illustration of the membrane element, which maintains the separation between the two different solutions, and illustrates the principle underlying the present invention.
Figure 2 is a schematic illustration of a solution, in which is placed an actuator made in accordance with the present invention and used in conjunction with a device that restricts the flow, or with a valve device located in a drainage pipe used for oil or gas formations (well)below the surface of the earth.
The implementation of the invention
The present invention is based on the principle of using the difference of the values of osmotic pressure in the element that serves as the drive mechanism, or W is a drive unit of the actuator. More specifically, the present invention is based on the application of osmotic element, intended for joint operation with the respective actuator. Osmotic element is placed in the fluid flow, thus ensuring the availability of forces and motion required to actuate the actuator through the use of the difference of the values of osmotic pressure between the solution inside the element, and the external fluid flow, relative to the specified element, resulting in a corresponding move, or setting, for example, a valve or device that restricts the flow.
The fundamental way of the actuating element in accordance with the present invention, can be illustrated as shown in figure 1, applied to a "closed" container 1 consisting of two cameras 2, 4, one wall of which is a semi-permeable membrane 3. Such a semi-permeable membrane 3 is permeable with respect to the solution in this case is practical is the use of water-salt solution is inside one chamber 2, but it is impermeable to the dissolved environment, in this case, such an environment is concerned with the ü. Thus, water can move freely from the chamber 2 of the element through the membrane 3 in the other chamber 4, where there is water or an aqueous solution having a low salt content. Due to the fact that the water passes through the membrane, there is a corresponding pressure difference on both sides of the membrane. This value is called the difference of osmotic pressure. A bold line in each of the chambers 5 and 6 marked the fluid levels inside them.
Osmotic pressure is determined by solving the classical thermodynamic equations, which is the condition for achieving the equilibrium state on both sides of the membrane. After reaching equilibrium the chemical potential of the solution should be the same on each side of the membrane, given isothermal conditions. Figure 1 shows that the chemical potential for the two phases existing in the chambers 2 and 4 can be respectively defined as:
where R is the universal gas constant, T is temperature, V is molar volume, P is pressure, and the concentration of the solution. The molecules of the solution in the phase dilution, have a higher (more negative) chemical potential compared to the molecules in koncentrirovannaya. This chemical imbalance causes a flow of molecules in solution (water), moving from a less concentrated phase in a more concentrated phase. This move continues until a balance is reached and
All parameters in the expression for calculating the chemical potential (equations 1 and 2 above) may change, such as temperature, concentration and pressure. In other words, with respect to the water-salt solution, the water will quickly move towards the side where the concentration of the solution above, diluting the solution, while the salt will tend to quickly move in the opposite direction, while the corresponding increase in the concentration of the solution. Moving salt will happen only if the membrane is not perfectly semi-permeable membrane. By combining equations (1), (2) and (3) with each other, we get the following expression:
The difference between the corresponding values of the hydrodynamic pressure (P1-P2) is called the difference between the values of osmotic pressure Δπ=π1-π2. If in phase 2 (ai,1=1 in the chamber 4) provides for the use of clean process is a (water), equation (4)indicating the pressure, takes the following form:
In accordance with the foregoing figure 2 is a schematic illustration of the solution, which is placed in the actuator 10, made in accordance with the present invention and used in conjunction with a drainage pipe 8, which is designed to produce oil or gas from formations (well, not shown)located beneath the surface of the earth. In the example presented here, the actuator is an integrated part of the valve or regulating device, restricting the inflow and installed in a drainage pipe.
As shown in figure 2, the actuator 10 consists of a housing 7 with internal osmotic element 9. The housing 7 together with the osmotic element 9 is located inside the tube 8 directly opposite the openings 11 and attached thereto. This is provided to the oil, gas and (or) water is drawn from the formation into the pipe 8 through the opening 11, passed through the element 9 and then through the corresponding openings or holes 12 provided in the housing, and then bypassing the overlying plate or other similar items 13 passed deeper into the pipe 8. The element 9 is, in turn, of a hollow casing or chamber, the end face of which treatment is Naya to the corresponding wall of the pipe 8, is a semi-permeable membrane 14, while the other wall of this building, located on the opposite hand, is a flexible impermeable membrane 15. Overlying the plate 13, which is on the opposite side relative to the holes 12, is attached to the flexible membrane 15. The inner cavity of the element 9 is filled with water and saline solution, and this also sets the salt blocks 16 that are designed to ensure that the solution remains saturated.
The actuator 10 with element 9 operates as follows. When through the membrane 14 is only oil and / or gas, the flexible membrane 15 together with the overlying plate 13 will be squeezed inside and the flow of the respective fluid gets the opportunity to pass through the gap between the holes 12 and the overlying plate 13 (which is in the open position). When along with oil and / or gas will pass through this membrane also water, then gradually inside the chamber will accumulate water passing through the membrane 14, causing a corresponding increase in the volume of the solution inside the chamber, causing the flexible membrane 15 will start together with the plate 13 to move toward the outside, gradually blocking the flow sootvetstvuyushchei environment, passing through the holes 12. If you accumulate a large enough amount of water, for example, in the case of formation of the corresponding cone watering, as mentioned above in the introductory part of the present description, then will move the flexible membrane with the base plate in the outer direction on the full value of their progress, resulting in end-to-end flow is completely blocked. Thus, the actuating mechanism made in accordance with the present invention, can be used for partial or complete control of the flow of oil and (or) gas, which will be carried out depending on the amount of water supplied with oil or gas.
You should pay attention to the fact that the present invention in the form, as defined in the attached claims, is not restricted only to the above example of its implementation. For example, instead of the flexible membrane may be provided with the appropriate device made in the form of a cylinder with an internal piston, and the piston of this device performs a corresponding movement of the overlying plate. Or instead of technical solutions, providing for the presence of holes and plates 12 and 13 respectively, can be applied such tehnicheskomprodlenii, based on the use of needle and nozzle, and moving the needle relative to the nozzle in this case is provided by a flexible membrane or piston.
The present invention also is not limited in its practical implementation only in relation to oil and (or) gas, as indicated in the above description of the invention. It can be used in any situation in which there are any liquid or solutions and where can it be applied the principle of osmosis.
The present invention may be providing the respective advantages realized practically applied to such a device intended to limit the inflow of the fluid medium, which is disclosed in the description of the invention the European patent No. 0588421 belonging to the applicant of the present invention.
1. The method of application of the actuator (7), designed to fit in the flow of fluid or the reservoir containing the fluid, and, in particular, actuator, designed to allow its use in combination with a drainage pipe (8)used in the extraction of oil and/or gas from an oil and/or gas-bearing reservoir, characterized in that include osmotic ele is enta (9), used to drive the actuator (10) and placed in the fluid flow, securing the availability of forces and motion required to actuate the actuator through the use of the difference of the values of the osmotic pressure between the solution inside the element (9), and external fluid flow or reservoir containing the fluid, relative to the specified element, resulting carry out the corresponding movement or the valve setting or adjusting device (10)restricting the flow.
2. The method according to claim 1, characterized in that the specified element as a solution using a water-salt solution.
3. The method according to claim 1 or 2, characterized in that the actuator (7) is used to actuate the valve (13, 7), which regulate the flow of fluid entering through the inlet openings in the drainage pipe (8).
4. The actuating mechanism (7)that is designed to fit in the flow of the fluid and, in particular, the Executive mechanism, designed to allow its use in combination with a drainage pipe (8)used in the extraction of oil and/or gas from an oil and/or gas-bearing formation, wherein MC is connected actuator (10) comprises an osmotic element (9), designed with space in the fluid flow, securing the availability of forces and motion required to actuate the actuator (10) by using the difference of the values of the osmotic pressure between the solution inside the element (9), and external fluid flow or reservoir containing the fluid, relative to the specified element, resulting carry out the corresponding movement or the valve setting or adjusting device that restricts the flow.
5. The actuator according to claim 4, characterized in that the specified element as a solution using a water-salt solution.
6. The actuator according to claim 4 or 5, characterized in that the actuator (10) is an integrated part of the valve or regulating device that restricts the flow, with the specified element (9) is located inside the housing (7)which is fixed to the wall from the inside of the drainage pipe (8) under the hole (11) in the wall of the pipe, providing for the flow of fluid from the reservoir on the outside of the drain pipe through the hole or holes (11), where this medium passes through the housing (7) and comes out through the holes (12)performed and provided by the presence of plate (3), intended for closing and opening of holes (12) using (9).
7. The actuator according to claim 6, characterized in that the plate (13) valve is designed to move under the influence of the respective flexible membrane (5)which represents the whole or any part of one of the walls of the specified element (9).
8. The actuator according to claim 6, characterized in that the plate (13) valve is designed to move under the influence of the respective piston, and the specified element is a structure made in the form of a cylinder with an internal piston, and in which the moving piston is one of the enclosure walls of the specified element.
9. Actuator according to one of pp.5, 7 and 8, characterized in that provided by the laying of salt blocks (16) inside the specified element.
10. The actuator according to claim 6, characterized in that provided by the laying of salt blocks (16) inside the specified element.
FIELD: oil and gas industry.
SUBSTANCE: invention refers to methods of restriction of bottom water and annulus overflows in production wells. The method consists in pumping water and solution of sodium naphthenate into a well; then the procedure is repeated not less, than 3 times; also cement solution is pumped with addition of sodium naphthenate; while initially solution of sodium naphthenate and water is pumped and then additionally alumo-chloride is pumped. Volume ratio of sodium naphthenate and alumo-chloride can be 4:1.
EFFECT: upgraded efficiency of method due to effect of hydrophobisation of porous space, increased amount of forming cementing material, thermo-stabilisation of this material under conditions of high temperatures of bed (above 80°C) and creating more reliable isolation screen.
2 cl, 2 tbl, 3 dwg
FIELD: oil and gas industry.
SUBSTANCE: invention relates to methods of increasing oil production and reducing water cutting of production. According to the method water with initial ionic force of 0.0004-0.0008 mole/l is activated in a cathode zone of diaphragm electrolytic cell chamber during 0.5-3 hrs at imposition onto water of electric field of E=(1000-15000) V/m strength. Powder of silica sand, or glauconite, or a rank of alumina silicates: zeolite or amphoteric materials: bentonite, montmorillonite, nontronite, kaoline (anauxite), talk, pyrophyllite, each separately or in random mixture are introduced into activated water at weight ratio to water 5-25%. Produced dispersive mixture is passed through the cathode zone of the electrolytic cell at strength of electric field E=(1000-15000) V/m at a rate of 1-10 m3/hour during one hour, thus obtaining activated dispersive system which further is pumped into horizon in volume of 5-100 m3. After that fresh water is pumped into the horizon as a buffer at volume of 1-20 and 3-80 m3 of horizon water as driving under pressure of 60-90 atm at during 3-5 hours.
EFFECT: increased yield of oil from layer-by layer non uniform horizons, reduced volume of pumped off produced mineralised water, reduced ecological danger of fresh water mineralisation in open water reservoirs, bogging of soil and formation of alkaline lands on it.
FIELD: petroleum industry.
SUBSTANCE: invention relates to oil and gas production industry, namely to dry operation of wells. The substance of the invention is as follows: according to this method wells are equipped with flow and production strings and includes injection of water repellent compound under pressure into the seam. According the invention prior to mining operations a flexible pipe is lowered into the internal space of the production string under pressure by means of the coil tubing rig. The circular and annular spaces of the well are opened. The water repellent compound is injected through the flexible pipe in the amount required, overpressure being maintained in the circular and annular spaces, which exceeds the pressure of the water repellent compound injected by not less than 10%. The water repellent compound is forced through into the seam up to the depth required. Next the flexible pipe is withdrawn out of the well. The water repellent compound is injected regularly during the period of increased gas extraction out of wells without killing the same.
EFFECT: possibility of long-term dry operation of wells with maintaining initial effective thickness of the seam.
3 cl, 1 ex, 3 dwg
FIELD: oil industry, particularly non-uniform reservoir development.
SUBSTANCE: method involves injecting isolation composition namely Portland cement dispersion and water-soluble polymer in well, wherein the components are taken in proportion of 1:(0.01-0.5) in oil-bitumen product, 5-56 parts by weight of Portland cement and water-soluble polymer are taken for 100 parts by volume of said dispersion; injecting aqueous Portland cement solution along with said dispersion, wherein the solution is taken in proportion of (0.1-0.5) per 1 part of said dispersion.
EFFECT: increased efficiency of stacked oil pool development and highly-permeable watered reservoir zones isolation.
2 cl, 3 tbl, 3 ex
FIELD: underground well repair, particularly methods to create behind-casing screen in productive reservoir of oil, water and gas wells.
SUBSTANCE: method involves injecting foamed polymeric solution including water-soluble polymer in amount of 1.5-2.5 % by weight, foaming agent in amount of 1-3% by weight, cross-linking foam stabilizing agent in amount of 0.2-0.6% by weight and water in bottomhole formation zone; injecting porous plugging composition including cement grout with 0.3-0.5 water-cement rate taken in amount of 60-80% by weight, above mentioned foamed polymeric solution in amount of 20-40% by weight in bottomhole formation zone. Each of said solutions is characterized by viscosity η and yield point τ change during injection and cross-linkage thereof.
EFFECT: prevention of bottomhole formation zone blocking in slightly cemented reservoirs.
8 cl, 4 tbl, 5 dwg, 1 ex
FIELD: oil production, particularly by reservoir waterflooding.
SUBSTANCE: method involves cyclically injecting polymeric dispersed system components in reservoir, wherein the polymeric dispersed system includes polyacrylamide, mud powder, chromium composition and water. The mud powder is modified bentonite mud powder. The polymeric dispersed system is injected in the following way. First of all 4-6% modified bentonite mud powder suspension in 0.04-0.12% aqueous polyacrylamide solution is injected in well. Then the suspension is forced in reservoir with buffer water volume and holding in reservoir within 1-3 hours. After that 1-6% modified bentonite mud powder suspension in water including 0.005-0.015% of chromium composition is injected in well under pressure 10-40% higher than water injection pressure in series with mixture including 0.07-0.25% aqueous polyacrylamide solution and 0.033-0.1% chromium composition solution under water injection pressure.
EFFECT: increased oil recovery from reservoirs, decreased water content in produced product and prevention of reservoir bottom area mudding.
FIELD: oil production, particularly preventing gas- or water-coning phenomena, for instance the formation of a conical column of gas or water around wells.
SUBSTANCE: method involves injecting hydrophobic composition in water influx channels; lowering and installing shutter provided with shoe at shutter end within water influx interval. The shoe may slide upwards in axial direction and is retained with shear members. The shoe has longitudinal and side communicating channels. Before hydrophobic composition injection the shutter is lowered to well bottom without supporting thereof. After that low-diameter pipe string is additionally inserted in shutter to provide airtight cooperation thereof with longitudinal channel. After hydrophobic composition injection through side channels the shutter is lowered to well bottom up to upward shoe movement with side channel closing. Low-diameter pipe string is removed from well before shutter installation.
EFFECT: improved water influx isolation.
FIELD: oil and gas industry, particularly temporary plugging of productive reservoir intervals, killing of wells having abnormally low reservoir pressure during well repair and to separate gas and oil intervals during plugging of multizone reservoir under combined development thereof and lost-circulation zone isolation during well drilling.
SUBSTANCE: method involves creating porous packer by injection of two compositions, namely polymeric solution and plugging liquid in well, wherein polymeric composition includes water-soluble polymer, cross-linking agent, foaming agent and water. The water-soluble polymer is polyacrylamide and/or carboxymethylcellulose and/or styromaleate. Above components are taken in the following amounts (% by weight): water-soluble polymer - 0.1-10, cross-linking agent, namely Cr2(SO4)3, Cr(C2H3O2)3, CrCl3, - 0.05-10, foaming agent, namely sodium alkyl benzene sulfonate, Neonol, sulfanole, Neftenol, - 0.1-5.0, remainder is water. The composition may additionally have gaseous agent, namely nitrogen, carbon dioxide, natural gas so that expansion ratio of the composition is 1.28-3.0. The plugging liquid is invert emulsion based on hydrocarbon phase, namely oil and/or hydrocarbon solvent, aqueous phase, namely water and/or salt solution of CaCl2 or NaCl2 or MgCl2 or BaCl2 in emulsifier presence. Above components are taken in the following amounts (% by weight) - hydrocarbon phase 15-18, aqueous phase - 72-82, emulsifier is 3-10. The composition is serially injected in well and followed by well killing liquid injection. Extreme dynamic shearing stress of polymeric solution is 25-110 Pa. Static shearing stress of porous packer is 50-410 Pa. Composition is formed on surface with cementing agent usage. The compositions are injected in laminar flow regime. Packer porosity is 10-50%. Plugging liquid volume is 2-4 m3, density thereof exceeds that of well killing liquid. The injection is carried out in two stages and time interval between the stages is not less than 30 min. Injection pressure is not higher than proof-test pressure. In winter unfreezing liquid is added to polymeric composition. Packer density is changed by heaving agent, namely metal salt CaCl2, KCl, MgCl2, BaCl2 solution addition. Packer is also used to create elastico-viscous screen to protect against mechanical impurities entering from exploitable reservoir or to isolate reservoirs during simultaneous or serial reservoir exploitation. Packer is retained for predetermined time interval.
EFFECT: possibility to maintain collecting properties of reservoir during current well repair and well workover.
20 cl, 5 ex, 3 tbl
FIELD: oil and gas production industry, particularly to treat bottomhole formation zone during oil and gas production.
SUBSTANCE: method involves inserting material for further exothermal reaction performing in well; forcing hydrochloric acid through the material and executing time delay. The material used for exothermal reaction performing is in the form of aluminum cuttings. First of all aqueous carboxymethylcellulose solution is formed. Then calculated amount of aluminum cuttings and grinded raw rubber are added to the solution. Above components are taken in the following amounts (% by weight): carboxymethylcellulose - 1.5, aluminum cuttings - 14.5, raw rubber - 11.6, water - 72.4. After that the ready solution is forced in reservoir and 20% hydrochloric acid is injected in well. Ratio between aluminum and hydrochloric acid is 25.0 parts by weight of aluminum per 75.0 parts by weight of hydrochloric acid.
EFFECT: increased bottomhole formation zone treatment reliability.
FIELD: oil and gas production.
SUBSTANCE: whole process comprises primarily exposing well on polymer-chalk mortar, perforating bottom zone of formation under polymer-chalk mortar layer, creating acid-degradable protective shield in bottom zone by forcing polymer-chalk mortar under pressure exceeding specified cementation pressure by 10-15%. Thereafter, casing string is descended, annular space is cemented, and bottom zone of formation is re-perforated through casing string and protective layer is destroyed with acid. Polymer-chalk mortar has following composition, wt %: soda ash 1-6, carboxymethylcellulose 1-6, polyacrylamide 2-3, clay 48-52, chalk 46-50, water - the balance.
EFFECT: increased productivity of formation due to prevented negative action of drilling fluids and appearance of softened bottom zone.
SUBSTANCE: valve consists of connected with flow string (FS) cylinder body with radial openings, and of movable spring loaded pressure tight bushing placed in body and forming plunger pair. When a well is operated with a not-immersed sucker rod pump, the valve is equipped with a rod with a coupling intended to free movement in the internal part of the valve and connecting the plunger of the not-immersed sucker rod pump with bars tied with a cable suspender of a pumping unit. Also the valve is equipped with the second mandrel sub connecting its body with a lifting branch of the not-immersed sucker rod pump. Internal surface of the pressure tight bushing has a section of a conic shape. The coupling is located on a rod with consideration of depth of the suspender of the not-immersed sucker rod pump and stretching, caused by weight of bars, at a distance from the said section of the conic shape chosen so, that at operation of the pump the said coupling will not reach the said section and facilitating support of the coupling on this section at release of the rod connected to bars, from the cable suspender of the pumping unit to displace pressure tight bushing of the valve till coinciding with radial openings in the body of the valve and opening communication of the FS cavity with annular space.
EFFECT: reduced consumption of hot oil used for flushing, improved conditions of oil lifting from pump to well head, and increased operation life of immersed equipment between flushings.
2 cl, 1 dwg
SUBSTANCE: group of inventions refers to method and device for remote access by means of intelligent valve control, which can be used at operating down boreholes. The system consists of two or more valves, each accommodated to operate independently in a preset interval of pressure. Two or more valves are intended to perform a group of successive actions by means of one or several well tools on base of pressure of fluid medium exerted to two or more valves.
EFFECT: possibility of multiple usage of remote access per one lowering of equipment of bottom of casing string.
29 cl, 5 dwg
FIELD: oil and gas industry.
SUBSTANCE: invention refers to well equipment and can be implemented at production of fluid or at pumping working agent. The unified well chamber consists of a case in form of cylinder or oval pipe, of lower and upper tips with pipe thread, of an internal mandrel installed in the upper tip and made with a screwed surface for rotation of a cable tool - a projecting deflector. The hollow pocket is made with at least one additional support boring of a bigger diametre located between the lower boring of a smaller diametre of the hollow pocket and a support face of boring of a bigger diametre, also the diametre of the support boring is bigger, than the external diametre of the elastic element of the removable device or instrument; in addition, at installation of a long removable device or instrument into the hollow pocket the elastic element of the device or the instrument is fixed in the lower support face or lower boring of a bigger diametre, while at installation of relatively short removable device or instrument into the hollow pocket the elastic element is fixed higher in the additional support boring of a bigger diametre.
EFFECT: unification of well chamber design facilitating installation of long, as well as short removable devices or instruments into the same hollow pocket of chamber.
6 cl, 6 dwg
FIELD: oil and gas industry.
SUBSTANCE: group of inventions refers to down hole tools, particularly to shape of pass through openings made in their cases for down hole valves or pass through flow regulators, specifically for valves or tools like sliding coupling applied in pressure wells. The essence of the invention is as follows: according to one of the versions the case of the down hole tool has a body of the case wherein a pass with a lenghthwise axis is made. There is at least one opening with upper and lower ends relative to the borehole of the well made in the body of the case and designed to let fluid with solid particles under pressure out of it. Also the opening, meant to minimise erosion effect onto a casing column of the well, and the pass itself have flat or inclined flat, or inclined flat and curvilinear surfaces forming an extension in the direction from the upper end of the opening to its lower end.
EFFECT: increased reliability of installation operation due to reduced erosion wear of outlet opening of this installation.
26 cl, 7 dwg
SUBSTANCE: present invention pertains to drilling techniques and can be used in drilling oil and gas wells using downhole drilling motors. The device has a hallow case with side openings, a bushing fitted inside the case, with a seat, radial overflow valves, a centre channel, facing a slide valve, spring loaded against the stop, fitted with provision for axial displacement and with a cowling, packing rings for covering the centre channel and a nut, limiting movement of the slide valve, and a bushing. The device has an upper adapter and a rubber seal, on whose outer surface there is a groove in which a baffle plate is fit. At one end of the seal, there is conical ring-shaped ledge, which, together with the baffle plate, is pressed to the slide valve and the hollow housing by an adjustment ring and a bearing disc, with the help of the threaded joint of the upper adapter with the hollow case. The other end of the seal freely lies inside the bushing with an annular gap in the zone of radial overflow channels and the seat of the bushing. The slide valve is fitted inside the bushing, in the bottom part, which is lower than the step made on its outer surface. There are overflow channels coming out to the annular gap, formed by the bushing, fitted on the outer step of the bush sleeve, and the bottom part of the bush sleeve.
EFFECT: reduced hydraulic resistance to the flow of drilling fluid, elimination of intense abrasion and fast wearing of components, increased air-tightness of the valve device, provision for long storage periods in working condition and increased reliability, durability and cost effectiveness of the device.
4 cl, 2 dwg
FIELD: oil and gas industry.
SUBSTANCE: facility contains case with holes made opposite to each of producing formations pressure tight separated from each other with packers. Adjustable valves are secured outside to a sleeve opposite to each of its holes; the said valves are designed to operate the corresponding producing formations at specified values of pressure in them. Each adjustable valve consists of a hollow cartridge wherein a bushing with a saddle is placed and a ball spring loaded from top to bottom; the said ball is placed on the bushing saddle, while the bushing is designed to adjust contacting force of a ball spring. Inside the sleeve there is a nipple plugged from beneath; this nipple is equipped with side holes and gates. At that, side holes of the nipple are arranged opposite sleeve holes; the latter must be set in the "open" position. The gates are pressure tight installed opposite to holes of the sleeve and they must be set in the "closed" position.
EFFECT: facilitating selective movement of valve bushings at one lowering of control mechanism into well, excluding of back flow of well liquid into formation at moment of well shutdown; regulated withdrawal of well liquid form producing formations depending on pressure therein.
FIELD: oil and gas industry.
SUBSTANCE: facility contains a case with holes made opposite to each of producing formation; valve bushings installed in the case opposite to each of its holes and designed to axially travel; the said bushings are equipped with spring circular fixing devices and clamped components; the facility also contains a control mechanism which is lowered into a well from a day surface and actuates the valve bushings to open or close the case holes, and packers. According to the invention outside the case opposite to each of its holes adjustable valves are installed. Each adjustable valve consists of a hollow cartridge wherein a bushing with a saddle is placed with a ball spring loaded from top to bottom; the said ball is placed on the bushing saddle. At that, adjustable valves are designed to run corresponding producing formations at exceeding of the set values of pressure by means of control of ball spring contraction force for each adjustable valve individually; and the clamped components of the valve bushings are made as their lower ends; while inside diameter of each of valve bushings decreases from top to bottom.
EFFECT: facilitating selective movement of valve bushings at one lowering of control mechanism into well, excluding of back flow of well liquid into formation at moment of well shutdown, regulated withdrawal of well liquid form producing formations depending on pressure therein.
FIELD: oil and gas industry.
SUBSTANCE: invention refers to oil and gas industry and can be used at operation of multibed wells both for separate and simultaneous development. Method includes selected development of producing beds by means of installation of receiving valves in the structure of a sleeve; the valves are installed in operating columns against each of producing bed; each valve has two steady positions: "closed" and "opened". According to the invention the receiving valves are installed on a case, located in operational column, and they bypass well liquid only in the bottom-up direction. At that, transition of receiving valves into one of the steady positions "opened" or "closed" is achieved by means of a nipple, installed inside the case and plugged from the bottom; the said nipple also has side apertures and gates. The side apertures of the nipple are arranged against the receiving valves, which ought to be set into "opened" position, while the gates are pressure tight installed against the receiving valves, which ought to be set into "closed" position.
EFFECT: reduction of well operation costs.
SUBSTANCE: back valve contains sealing, rod with closed head designed to be pressed tightly to sealing, one or more grooves on rod, and pressure force creating spring for setting off rod into tightened position. The safety valve contains a plunger in a case which operates under pressure of a working fluid, a flow pipe, functionally connected with the plunger, and a system of chemical reagent supply arranged inside the case and containing at least one back valve. The device of pressure tightness control of fluid medium pipeline contains a case with at least one pass for fluid medium flow, and cartridge installed in the case and equipped with at least one pass for fluid medium flow. The latter can be positioned against at least one pass in the case so as to allow or close communication between the said passes for fluid medium in the case and the cartridge.
EFFECT: upgrades effectiveness and efficiency and reduces costs.
21 cl, 7 dwg
SUBSTANCE: valve includes stopper with saddle and side channels, and bushing designed to close pressure tight side channels of stopper. The stopper is blinded at the bottom and is connected with the casing pipe. From below the casing pipe is equipped with a lower sleeve in its turn equipped below and inside with a cylinder recess where a hollow tail designed to perform upper axial movement is inserted and fixed in its lower position with shear pins. The sleeve is rigidly installed in the upper end of the hollow tail and is designed to interact in its upper position with the upper surface of the stopper saddle and to close pressure tight the side channels of the stopper from outside. A squeezing plug with a pressure tight head below and a ring recess made on the inside surface at the upper part of the stopper is used for pressure tight closing from the inside the side channels of the stopper. The ring recess of the stopper fixes pressure tight closing head of the squeezing plug in the stopper after interacting between the lower end of the tight pressing head of the squeezing plug and a stopper blind.
EFFECT: upgraded reliability of device operation and reduction of well construction period.
FIELD: oil and gas extractive industry.
SUBSTANCE: valve has body of steel, throttling assembly, locking assembly with ball and saddle for it. Between locking and throttling assemblies resilient impenetrable wall separating these is mounted fixedly with possible interconnection via U-shaped, turned by its knee upwards, tubular channel, with inner diameter greater than ball diameter, having two branches directed downwards and having various lengths. Elongated pipe branch is connected through open end fixedly placed on wall to hollow of body throttling assembly. Short branch end is placed above wall and is within hollow of locking assembly. Short branch pipe is extended above the knee for distance greater than ball diameter. It is made in form of branch pipe with closed upper end, forming a hollow - tank with stopping device for placement and holding of ball therein in starting position. Ball can possibly fall freely under its own wait in downward direction onto saddle if released by stop as a result of effect from outside force from cementing plug at the end of cementation.
EFFECT: higher reliability, better quality.
7 cl, 8 dwg