Combined operating method of underground gas storages
FIELD: oil and gas industry.
SUBSTANCE: operating method of underground gas storages involves intermittent injection of gas by compressors, which is supplied from a main gas line through production and injection wells of an underground gas storage to a reservoir bed under pressure exceeding formation pressure; further extraction of gas from the underground storage for further gas supply to the main gas line. The above extraction from the underground storage and its supply to the main gas line is performed in a compressor mode that is performed till pressure in the reservoir bed reaches the value excluding allowable well water flooding. With that, a suction gas line of compressor is connected to a gas extraction pipeline from the underground gas storage, and a discharge gas line of compressors is connected to the main gas line.
EFFECT: improving operating efficiency of an underground gas storage.
The invention relates to the operation of underground storage of natural and other gases.
The closest to the technical nature of the claimed method of operating the underground storage of natural gas (USG) is widely used in practice, the method including periodic flow of gas from the main gas pipeline gas pipeline-branch to block catchers, gas cleaning from dust and small particles, the gas after cleaning it to accept compressors, gas compression using compressors and pumping through the gas distribution points (GCP) on pipelines and wells in reservoir storage under pressure greater than formation pressure, after the end of injection gas from the reservoir, cleaning and drying selected gas and further flow in wells and pipelines through hydraulic fracturing directly into the main pipeline (Avilamycin "Process design of gas storage in aquifers", M.: Nedra, 1973, p.14-17).
The known method has several disadvantages, such as underutilized potential capacity of the UGS and the impossibility of quick supply of the necessary quantity of gas to consumers in terms of emerging and rapidly increasing gas demand in the short periods, for example, in such emergency sieve the operations, as frequent accidents on pipelines due to their "natural aging", the abnormally cold winter periods ahead of the commissioning of large gas consuming energy and industrial objects.
Technical task, which directed the claimed technical solution is the creation of a method of operation of UGS, allowing to increase the capacity and efficiency of UGS and quickly to meet the resulting increased demand for gas, primarily in the occurrence of extreme and emergency situations.
The technical problem is solved due to the fact that in the method of operation of gas storage facilities, including periodic injection compressors coming from the main pipeline gas from production-injection well underground gas storage in the reservoir under pressure greater than formation pressure, the subsequent selection of the gas from underground storages for further supply of gas to the main gas pipeline, according to the invention the specified selection of underground storage and feed it into the main pipeline is carried out in a compression mode, which is carried out until the pressure in the reservoir size, excluding allowable irrigation wells, in this case the suction pipeline is ompression connect with tubing selection of gas from underground gas storage facilities, and the discharge gas compressors - with a trunk pipeline.
The essence of the claimed technical solution is illustrated by a drawing, which in the example shown a schematic diagram of the method, including the main pipeline 1, gas-compressor units (GCU) 2, which can be used, for example, compressors, piston type gas distribution points (GCP) 3, underground gas storage (UGS) 4 and made it operational-injection wells 5. Above GPA 2 is equipped with 6 suction and discharge 7 gas pipelines. HPA 2 is connected to the trunk pipeline 1 directly through the suction gas line 6 and through the discharge pipeline 7, connected with connected directly to the gas pipeline 1 feed gas pipeline 8. HPA 2 is connected with UGS 4 with the suction gas line 6 is connected through a pipeline 9 gas 10 gas extraction from underground gas storage 4, and via the pressure of the pipeline 7, connected via the pipeline 11 gas supply in UGS 4 with the mentioned pipeline 10. The pipeline 10 in turn is connected with UGS 4 through the pipes 12, which are connected with operation of injection wells 5 storage 4. Through the piping 12 is carried out as injection and pumping gas from underground storage facilities 4. All Gazarov the years 6-11 equipped with shut-off valves 13-18 at the necessary pressure and gas flow.
Traditionally in the summer are pumping gas into underground storage facilities, and in winter its selection of UGS. In practice, the operation of UGS is mainly used compressor, the method of injection gas and natural pressure of his selection of UGS. The proposed scheme allows to implement these modes (compressor and natural pressure) as for injection and withdrawal of gas, and any combination use of the above-mentioned modes.
Implementation of the claimed method is as follows.
When the compressor pumping gas into underground storage facilities 4 gas is supplied from the main pipeline 1 pipeline 6 through the open valve 13 for the reception of the compressors 2 piston type, with which the gas through the open valve 14 is injected into the discharge pipeline 7 and then through open valve 18 is in the pipeline 11 gas supply in UGS 4, where the gas through the pipeline 12 is directed in the operating-injection wells 5 storage 4. Compressor gas injection into underground storage facilities 4 begin, as a rule, in the case when the pressure in the reservoir and UGS 4 below the pressure in the main pipeline 1.
Natural pressure gas from the storage facilities 4 begins when the pressure in the reservoir exceeds the pressure in the pipeline 1. Gas from underground storage facilities 4 through operational-injection wells 5 through pipelines 12 enters the pipeline 10 selection of gas when you open the kr is not 17 directly into the main pipeline 1, while the shut-off valve 16 is closed. Natural pressure gas from the storage facilities 4 to carry out until the pressure in the reservoir drops to a value close to or equal to the maximum pressure in the main pipeline 1.
Compressor extraction of gas from underground storage facilities 4 carried out until the pressure in the reservoir size, excluding allowable watering wells 5. When the compressor of the gas shut-off valves 13, 17 and 18 closed, and the shut-off valves 14, 15 and 16 are opened, while the low-pressure gas from the storage facilities 4 gas 10, 9 and then through inlet pipeline 6 serves to receive the compressors 2, through which then pump the gas through the pipelines 7 and 8 in the main pipeline 1. The same reception use and in emergency situations in the short-term (up to one month), regardless of the gas pressure in the reservoir under the necessity of increasing the supply of gas to the consumer, which is not possible when using only one top-pressure recovery mode selection of gas from underground storage facilities 4.
Implementation of the proposed method:
- significantly increase the capacity of UGS, and accordingly to increase the efficiency of its work;
- reduce the amount of buffer gas in underground storage facilities;
- implement immediate supply of the necessary quantity of gas from underground gas storage to consumers when the buildings permanently, it is the venue extreme and emergency situations (abnormally cold winter periods, the accident of the transportation system and others).
The method of operation of underground gas storages, including periodic injection compressors coming from the main pipeline gas from production-injection well underground gas storage in the reservoir under pressure greater than formation pressure, the subsequent selection of the gas from underground storages for further supply of gas to the main pipeline, characterized in that the selection of underground storage and feed it into the main pipeline are in compressor mode, which is carried out until the pressure in the reservoir size, excluding allowable irrigation wells, in this case the suction pipeline compressors connect with pipeline gas extraction from underground gas storage facilities, and the discharge pipeline compressors - with a trunk pipeline.
FIELD: oil and gas industry.
SUBSTANCE: invention refers to a method for making a low-permeability screen in porous medium at underground gas storage in porous reservoir beds and can be used in oil and gas producing industry. According to the invention, first, required volumes of solutions are determined in interwell spaces; the amount of 0.5-0.55 of design volume of spike solution and spike solution itself are pumped subsequently to injection wells till gases appear in a relief well; after that, design volumes of the solution and gas, which provide minimum required width of a screen, are pumped to the unloading well; waste gas of compressor stations is used as gas for creation of a screen. Nonflammable and/or inert gases are used as gases for creation of the screen.
EFFECT: increasing the screen continuity, reducing the flow rate of foaming agent solution and consumed energy for pumping-in and pumping-out, economy of natural gas and improvement of environmental situation in the underground gas storage location area.
3 cl, 6 tbl, 4 dwg
FIELD: packing industry.
SUBSTANCE: invention relates to the method of carbon dioxide (CO2) storage in a porous and permeable underground reservoir bed) and in particular, to the method for injection of CO2 into a hydrocarbon reservoir for its storage. The concept of the invention is as follows: the method includes the following stages: (a) extraction of a produced fluid flow from a development well, which contains produced hydrocarbons, water and CO2; (b) direction of the produced fluid flow to a process facility, where a steam phase flow is separated from this flow, containing carbon dioxide and volatile hydrocarbons; (c) compression of the produced steam phase flow to the pressure above the maximum pressure, when two phases of gas and liquid may coexist, for the composition of the produced steam phase flow; (d) cooling of the compressed flow with formation of the cooled flow in a dense phase condition; (e) direction of the CO2 flow towards the injection equipment, which arrives from the side and may be in a liquid phase or in a supercritical condition; (f) mixing of the cooled flow from the stage (d) with the flow of CO2 arriving from the side to form a combined flow, which represents a flow of a dense phase substance; and (g) injection of the specified combined flow into the hydrocarbon reservoir via an injection well.
EFFECT: increased efficiency of the method.
22 cl, 2 dwg
SUBSTANCE: invention relates to making underground reservoirs in rock salt formations. Reservoir is profiled using concentrically arranged tubes to lift brine, feed water and production pipes. Thereafter, water feed pipe is withdrawn to feed water feed column composed of flexible water feed pipe. Then, reservoir shape is corrected by feeding solvent at reservoir correction point via gap between brine lift tube and flexible water feed pipe of said column. Additionally, device comprises water feed column with flexible water feed pipe ropes arranged in symmetry about is cross-section and passed through rings rigidly secured to flexible pipe at regular spacing to connect flexible pipe bottom end with auxiliary winches.
EFFECT: expanded operating performances.
2 cl, 2 dwg
FIELD: oil and gas industry.
SUBSTANCE: invention refers to underground storage and reservation system of LNG for its accumulation and distribution to the consumer. LNG US is located below the ground level 1 at the elevation preventing the freezing of ground surface at the most long-term estimated storage of LNG. It is blocked off and protected along the perimeter from ground mass with a concrete wall of "wall in ground" type 2. It includes reinforced-concrete tank 5 located at the bottom from compacted ground 3 and heat-insulating intermediate layer 4, which is enveloped on external side surface with soft intermediate layer 6, and on the inner side it is covered with layers of heat insulation 7 and waterproof insulation 8 from LNG. LNG US is equipped with process shaft 9 with pipelines 10, which comes out of reinforced-concrete reservoir to ground surface 1, tight hatches 11 and stairs 12. Top of concrete reservoir is filled with a layer of light heat-insulating material 13. Vertical wall of reinforced-concrete reservoir 5 is made of single-type elements of constant curvature in the form of solid reinforced-concrete units 14 of constant section with surfaces 15 adjacent to each other. Along the perimetre of end surfaces 15 of reinforced-concrete blocks 14 and their centre there made are grooves of rectangular section with tightening horizontal and vertical 18 reinforcement installed in them (vertical 17 and horizontal 18 tightening reinforcement rods).
EFFECT: use of the invention ensures reliability of horizontal tightening of reinforced-concrete blocks; simplifying the construction procedure of side walls of reservoir; improving construction quality and operating reliability of LNG US.
FIELD: oil and gas production.
SUBSTANCE: proposed device comprises water feed tube with bottom head Note here that the latter features length exceeding radius of reservoir and is made of flexible water feed tube furnished with mechanical muscles secured thereto and pneumatically or hydraulically communicated with pressure source to control every muscle for positioning tube end in space.
EFFECT: higher efficiency.
FIELD: oil and gas production.
SUBSTANCE: invention refers to oil and gas industry and serves for creation of underground gas storages (UGS) on the base of non-hydrocarbon gases minefields. In geological structures filled with non-hydrocarbon gas there constructed are production wells with opening of geological structure collectors. Lithological and physical characteristics of rocks of geological structure cap are used to define maximum allowable pressure in geological structure and gas is filled in geological structure collector till this specified value with creation of buffer and active gas volume. Note that buffer gas volume is primary created from formation non-hydrocarbon gas, the gas pumping and further extraction is primary done in structure upper part. Gas extraction is done after holding layering time of mixture of pumped gas and formation non-hydrocarbon gas till the latter appears in production wells.
EFFECT: invention provides decrease of natural gas consumption for generation of gas buffer volume and creation of high process pressure in UGS.
SUBSTANCE: underground reservoir filled with a brine is equipped with a casing pipe and a hanger pipe, test intervals are identified, interval injection of a test fluid is carried out into a tube space of casing and hanger pipes until the test fluid-brine interface reaches the lower elevation of the test interval with simultaneous displacement of brine to day surface. Application of test pressure is carried out with a time delay for each identified test interval and detection of pressure drop rate. Then the test pressure is repeatedly applied with additional pumping of the test fluid, afterwards value is determined, as well as leakage intensity by pressure drop rate and volume of added test fluid. At the same time, according to the invention, prior to application of test pressure, a hanger pipe block is installed under the casing pipe block, the lower elevation of the investigated interval is identified by volume of brine displaced from the underground reservoir and by values of test fluid and brine pressures measured at the wellhead in the period of underground reservoir pressurising. At the same time application of test pressure is carried out in stages by means of increasing it in the following sequence: 0.5 Ptest, 0.75 Ptest, Ptest, where Ptest - test pressure, with staged soaking of the underground reservoir in time under the specified pressures until the temperature background is balanced for the injected test fluid, brine and rock that holds the underground reservoir. Pressure drop rate is identified at each stage of the underground reservoir soaking in time under applied pressure, and value and intensity of leakage within the range of the identified test interval are set by averaged value of added test fluid volume during the period of staged application of pressure to the value of the test one.
EFFECT: increased reliability of testing for tightness of underground reservoirs.
SUBSTANCE: proposed method comprises pumping waste drill fluids from drilling rig to subsurface reservoir 1, forcing them through well 2 into said reservoir and changing them into frozen state. For this, free space 7 is provided in reservoir top section making at least 9% of the volume of fluid contained in drill wastes. In-season refrigerating device 3 is lowered through the well onto the reservoir bottom into drill wastes sediments. Drill wastes are frozen at the temperature lower than that of permafrost rocks in direction from reservoir vertical axis to its side surface.
EFFECT: higher efficiency of disposal.
FIELD: gas and oil production.
SUBSTANCE: gas pressurising horizontal wells in near-roof section of deposit and horizontal producers in lower section of deposit are drilled above level of water-oil contact of matrix section of collector considering arrangement of "old" producers and maximal possible area for stock draining. Also, gas-pressurising wells and producers should be uniformly distributed along total deposit volume above the level of water-oil contact of porous section of the collector. Pumping and withdrawal of gas through gas-pressurising wells and producers are performed synchronous and under sign-changing mode. Also, under a mode of gas withdrawal, simultaneously, oil recovery wells withdraw water-oil product and gas from reservoirs-collectors of lower and upper sections of the deposit, and gas pressurising wells withdraw oil from matrix constituent of the deposit and water - from watered and fractured zones of the collector. Gas is pumped into gas-pressurising wells with constant yield, while withdrawal - with gradual increase of yield. Into producers gas is pumped with gradual increase of yield.
EFFECT: raised recovery of oil in depleted oil and gas-oil condensate fields of fracture-porous type.
3 cl, 6 dwg, 1 tbl
SUBSTANCE: storage is arranged below earth level (1), is enclosed along the perimetre from the soil massif with a concrete wall of "wall in soil" type (2) and comprises a reinforced concrete reservoir (5) arranged on the base from compacted soil (3) and a heat insulation layer (4), and this reservoir at its external side surface is surrounded with a pliable layer (6) and is coated from inside with layers of heat insulation (7) and hydraulic insulation (8). The storage is equipped with a process well that exits the reinforced concrete reservoir to earth surface. On the concrete wall of the "wall in soil" type there is a support reinforced concrete ring (14), where guy ropes (15) coated with anticorrosion material are attached to support the roof of the reinforced concrete reservoir. At the external side of the concrete wall of "wall in soil" type from the level of the reinforced concrete reservoir roof to earth surface there is a conical or stepped mine filled with a layer of light heat insulation material (13) together with the roof of the reinforced concrete reservoir, guy ropes, support reinforced concrete ring.
EFFECT: possibility of increased capacity storages construction.
3 cl, 2 dwg
FIELD: oil and gas extractive industry.
SUBSTANCE: method includes performing a test pumping of liquid waste into absorbing well before operational pumping, while changing flow step-by-step. From equation of absorption base hydrodynamic parameters are determined for calculation of predicted coefficients of operation characteristics of absorbing well and reserve well. During operational pumping of liquid waste together with thermometry along absorbing well shaft, registration of actual pressures and flow on pump devices, actual pressures on mouth in tubing pipes of absorbing well, actual pressures on face are additionally registered in absorbing well as well as pressures on mouth in behind-pipe space, actual loss at mouth in behind-pipe space, actual loss of waste on mouth, actual positions of face well, upper and lower limits of absorption range from well mouth. In reserve well actual pressures on face are registered, as well as actual positions of liquid level from reserve well mouth, upper and lower limits of absorption range. Prediction coefficients are compared for operation characteristics of absorbing well and reserve well to actual coefficients. 9 conditions of hydrodynamic bed conditions at reserve well and absorbing well are considered during pumping of waste. Specific actions of operator on each condition are described.
EFFECT: higher reliability and trustworthiness.
FIELD: mining industry.
SUBSTANCE: method includes compressing gas at compressor station to required feed pressure, and utilization of drop liquid, containing drops of compressor oil and gas, before gas-distributing substation with following pumping of gas into well. Utilization of drop liquid is performed via slanted cylindrical separator of centrifugal type and deep chemical cleaning block in form of two parallel-placed absorbers, operating alternately with replacement of processed absorbents. Separator and two absorbers are mounted at tank for collecting compressor oil.
EFFECT: higher efficiency.
2 dwg, 1 tbl
FIELD: gas, oil, oil refining and other industries.
SUBSTANCE: invention relates to building and operation of underground reservoir in stable rocks, for instance, soluble salt deposits. Method includes delivery of water and putting out brine along water feed and brine lifting pipes placed one inside the other, charging and storing of gas in underground reservoir. After brine lifting, reservoir is dried and then is filled up with alternating layers of absorbent and inert porous material, volume ratio 2:1, delivered along clearance between water feed and brine lifting pipes. Brine lifting pipe is perforated in lower part in height of reservoir and it is installed in lower part of reservoir. Difference between angles of repose of absorbent and inert material does not exceed 10 degrees. This done, reservoir is filled with gas delivered along perforated brine lifting pipe.
EFFECT: increased productive volume of reservoir owing to sorption of gas on surface of absorbent, reduced cost of gas storing.
FIELD: mining industry.
SUBSTANCE: method includes driving a mine for cleaning sump and connecting it to sump in such a way, that mine soil for cleaning sump in place of connection is placed at level of shaft bottom, construction of water collector, located outside the shaft, and its connection with mine for cleaning sump, mechanized cleaning of sump. Transporting slope is driven to level of sump cleaning. Then water collector is driven. Mine for cleaning sump is driven with deflection towards water collector. Sump cleaning is performed by delivering spillage along transporting slope.
EFFECT: simplified operations, lower laboriousness.
6 cl, 5 dwg
FIELD: construction of underground reservoirs in rock salt.
SUBSTANCE: according to proposed method, hydrodynamic coupling is formed between casing tube strings to force gaseous nonsolvent from one well into the other. Solvent is delivered along suspended strings of tubes of first well, and brine is taken out along suspended strings of tubes of second well until gas pressure is built on head of first well required for setting gas -brine interface to new stage of rock dissolution, and maintaining of preset thickness of insulating layer of gaseous nonsolvent in top of dissolution stage in process of formation of first underground reservoir of ground is carried out at corresponding pressure rise on head of second well obtained by control of delivery of solvent and taking out of brine.
EFFECT: reduced consumption of gas at building underground reservoirs.
FIELD: transport and storage devices, particularly for building underground reservoirs.
SUBSTANCE: method involves placing adjusting pipe string bottom of directionally drilled well in horizontal position at well outlet; arranging preparation underground excavation for design tunnel reservoir height at initial stage of rock solution between casing and adjusting pipe strings of directionally drilled well; ejecting non-solvent in casing pipe strings along with maintaining non-solvent-brine interface in upper part of preparation excavation or in the case of stepped rock solving at level of each underground tunnel reservoir stage forming; maintaining non-solvent-brine interface in vertical well at level or above level of non-solvent-brine interface of preparation excavation.
EFFECT: increased efficiency of underground tunnel building.
FIELD: construction of underground reservoirs in rock salt.
SUBSTANCE: method involves obtaining solvent by mixing brine with sweet water by supplying low-mineralized solvent from one reservoir under construction having the lesser volume of excavated cavity; solving rock along with maintaining predetermined flow rate of sweet water and conditioned (saturated) brine to be removed; discharging non-conditioned (low-mineralized) brine for following resaturation from above underground reservoir under construction having the lesser volume of excavated cavity; serially finishing construction of underground reservoirs of the group; constructing one or several following reservoirs of above storage facility and uniting the reservoirs with ones under construction.
EFFECT: increased efficiency of storage facility due to improved rationality of rock solution in reservoir group.
FIELD: liquid storage, particularly building underground reservoirs for liquid in soluble rock.
SUBSTANCE: method involves solving rock in several levels, wherein vertical preparation mine is preliminary formed before each layer solving. Natural gas is used as nonsolvent. Gas-brine interface is provided and maintained above top of level to be developed and natural gas is injected in vertical preparation mine. Then interface border is lowered to above top or below it. After level development the interface is increased and maintained above top of next upper level to be developed. All above operations are repeated at the next level.
EFFECT: reduced time of reservoir building and increased reliability.
3 cl, 4 dwg
FIELD: automatic control of underground reservoir construction in soluble sedimentary rock, particularly underground liquid or gaseous hydrocarbon deposit constriction and underground industrial and radioactive waste storage.
SUBSTANCE: device comprises automatic measuring system for brine parameters determination. The measuring system comprises measuring unit with sensors to be installed directly in brine line and recording unit. Device also includes multi-channel receiving converter for information gathering and control unit, as well as ultrasound sensors linked to flowmeter. Information gathering unit output is associated with PC.
EFFECT: possibility of device usage for several underground reservoirs construction, extended range of technological parameters to be controlled during reservoir construction and increased accuracy of brine concentration determination.
2 cl, 1 dwg
FIELD: oil-producing industry; gas-production industry; methods of construction and elimination of the earth storages-collectors of the boring wastes.
SUBSTANCE: the invention is pertaining to the field of the environmental protection, in particular, to the methods of construction and elimination of the earth storages-collectors of the boring wastes at completion of the oil-and-gas boreholes construction. The technical result of the invention is erection of the effective water-insulating screen, reduction of the time of evaporation of the water from the liquid phase of the boring wastes, decrease of the material inputs for realization of the method. The method of construction and elimination of the earth storages-collectors of the boring wastes provides for the digging of the ditch in the mineral soil, screening the ditch bottom and walls for the water insulation, filling-up of the earth storages-collector with the boring wastes, lamination of the boring wastes by settling into the thickened and liquid phases, the liquid phase pumping out, evaporation of the water from it, covering over the thickened stage with the mineral soil, conduct formation of the water-insulating screen by hydrophobization of the soil of the ditch bottom and walls by the soil impregnation in depth of 5-15 cm with the 0.1-1.0 % density microemulsion spontaneously formed at addition in the water of the reactant РДН-1 -concentrate of the asphaltic-resinaceous and paraffinic components of petroleum in the volatile hydrocarbon solvent with the subsequent compaction and aging. After the pumping out the liquid phase is sputtered over the flattened section of the land allocated for construction of the borehole, on which they preliminary put the mineral soil of 25-30 cm thick taken from the walled ditch. After the water evaporation it is used for hydrophobization of the soil together with the dried up boring wastes by sputtering of the above indicated microemulsion at its consumption of 5-10 l per m2 of the ground surface. Then the indicated soil is removed and fully is used for covering of the thickened phase of the boring wastes in the earth storages-collectors of the boring wastes.
EFFECT: the invention ensures erection of the effective water-insulating screen, reduction of the time of evaporation of the water from the liquid phase of the boring wastes, decrease of the material inputs for realization of the method.
2 ex, 3 dwg