CN105319329A - Compact sandstone gas reservoir water-blocking damage and electrical heating water-blocking reliving simulation device and method - Google Patents
Compact sandstone gas reservoir water-blocking damage and electrical heating water-blocking reliving simulation device and method Download PDFInfo
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- CN105319329A CN105319329A CN201510889015.2A CN201510889015A CN105319329A CN 105319329 A CN105319329 A CN 105319329A CN 201510889015 A CN201510889015 A CN 201510889015A CN 105319329 A CN105319329 A CN 105319329A
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Abstract
The invention discloses a compact sandstone gas reservoir water-blocking damage and electrical heating water-blocking reliving simulation device and method. The device is mainly composed of a rock core, a gas bottle, a resistance probe, a pressure sensor, a temperature sensor, a circulating system, a condensation pipe, a data acquisition system, a gas mass flow meter and an electric heating rod, wherein a shell is arranged on the outer layer of the rock core and end covers are arranged at the upper and lower parts of the rock core; a gas inlet is formed in the shell; a well hole is formed in the center of the rock core; 5-10 drilling holes stretching into the rock core are distributed by taking the well hole as the center, and the resistance probe is arranged; the probe is connected with the temperature sensor and the pressure sensor; the circulating system and the electric heating rod are arranged in the well hole; the circulating system is composed of a pump and a simulated oil pipe; the pump is connected with the well hole; and the simulated oil pipe is connected with the condensation pipe and the gas mass flow meter. The method provided by the invention can be used for monitoring and recording the changes of temperatures, pressure, resistance and gas flows in real time, and simulating a whole water-blocking damage and electrical heating water-blocking reliving simulation process. With the adoption of the compact sandstone gas reservoir water-blocking damage and electrical heating water-blocking reliving simulation device and method, a stratum water-locking problem can be effectively solved, and a stratum environment of a near-well region is recovered and improved.
Description
Technical field
To the present invention relates in oil-gas mining field WATER LOCKING DAMAGE OF TIGHT SAND GAS RESERVOIRS infringement and the electrical heating solution locked mode that dewaters and intend apparatus and method, can effectively improve reservoir recovery ratio and improve reservoir environment.
Background technology
In drilling well, completion, well workover and mining operations process, all can there is external phenomenon of being detained in porous medium in many cases.Another is not miscible infiltrates original not miscible phase saturation in reservoir or porous medium mutually and increases, and all can damage relative permeability, reservoir permeability and oil gas relative permeate degree are obviously reduced.Not miscible be aqueous phase mutually time, this phenomenon is referred to as water-blocking effect.According to studying display both at home and abroad, Water-blocking damage has a strong impact on gas reservoir development effect, and one of major determinant type having become low permeability sand reservoirs.Water-blocking damage can cause multiple serious consequence, as hinder gas-bearing formation Timeliness coverage and accurate evaluation, increase operating cost, reduce gas recovery factor and slow down development process, payback period extend etc.Therefore, find a kind of efficient solution dewater lock method extremely urgent.
The release method of Water-blocking damage has following several: utilize add water lock de-plugging agent remove Water-blocking damage method (Liu Guolin etc. low permeability reservoir water blocking damage releasing technology desk research. rock gas and oil, 04 phase in 2012; Zheng Jun etc. surfactant is studied gas bearing coalbed detrimental effect. oilfield chemistry, 03 phase in 2005), with Splitting Method remove Water-blocking damage method (woods is glorious. low permeability gas reservoirs water blocking damage and release method research. Petroleum finance, 06 phase in 2003), inject CO
2gas removes the method for Water-blocking damage, and (.CO such as to be offered in model emblem
2handle up and remove retrograde fall out and water lock Pollution Study. engineering construction, 02 phase in 2012).But interpolation water lock de-plugging agent can not recover reservoir permeability completely and may cause secondary damage to gas bearing reservoir; The crack that the method that Splitting Method removes Water-blocking damage produces easily closes, and fracturing liquid also can by the bedrock surface invaded formation of dialysis mode along both sides, crack, increase water phase saturation, pore channel on blocking bedrock surface, produce the water-blocking effect oppositely sucked, thus reduction fracturing effect, this phenomenon is particularly evident to low permeability reservoir; Inject CO
2gas removes the method for Water-blocking damage due to CO
2use by the restriction of resource, and the corrosivity that tool is certain, implements to be obstructed in without source of the gas situation.The present invention removes the method for Water-blocking damage by electrical heating, better can recover core permeability, can not produce the water lock oppositely sucked, not limit, can not corrode and damage reservoir by source of the gas.
Chinese patent CN102536165A discloses one and produces microwave by microwave generating apparatus, to the method that the aqueous water in hyposmosis dense sand layer heats, but microwave penetration ability is forced heat penetration is dark, power demand is large, in the small space of down-hole, enter HIGH-POWERED MICROWAVES generating means under being difficult to, there is larger limitation.The present invention utilizes high temperature solution to dewater under lock only needs to enter electrically heated rod, and demand power requirement can be constructed at present accept, less with timer restrictive condition, experiment can be carried out in indoor, more fast, convenient.
Summary of the invention
The object of the present invention is to provide WATER LOCKING DAMAGE OF TIGHT SAND GAS RESERVOIRS damage and electrical heating solution dewater locked mode intend device, this device can be simulated Water-blocking damage and electrical heating solution and to be dewatered the overall process of lock, real-time monitoring record Water-blocking damage process and electrical heating solution dewater temperature, pressure, resistance and isolated gas flow change in lock process, to dewater lock to determine to realize Water-blocking damage and electrical heating solution.
Another object of the present invention be also to provide utilize this device to WATER LOCKING DAMAGE OF TIGHT SAND GAS RESERVOIRS infringement and electrical heating solution dewater be locked into row simulation method, the method principle is reliable, easy to operate, cost is low, effectively can solve local water lock problem in actual applications, recover and improve nearly well area ground environment.
For reaching above technical purpose, the invention provides following technical scheme.
The present invention is by analogue means Simulated Water lock course of damage, propose electrical heating solution to dewater the method for lock the process of the lock that dewatered by analogue means analog electrical heating solution, the omnidistance situation of change passing through the parameters such as data acquisition system (DAS) measuring tempeature, pressure, resistance and gas flow, the dewater process of lock of whole Simulated Water lock course of damage and electrical heating solution is more directly perceived, clear, its experimental result and data authentic and valid.
Experimental provision involved in the present invention is formed primarily of two parts, can realize water lock simulation process and the electrical heating solution locked mode that dewaters and intend the function of process.
WATER LOCKING DAMAGE OF TIGHT SAND GAS RESERVOIRS is damaged and electrical heating solution dewaters, and locked mode intends device, primarily of rock core, gas cylinder, reduction valve, Resistance probe, pressure transducer, temperature sensor, the circulation system, condenser pipe, data acquisition system (DAS), mass-flow gas meter, electrically heated rod composition.
Described rock core skin has shell, and there is end cap top and the bottom, are sealing state, and core-shell has air intake opening, and this air intake opening connects reduction valve and gas cylinder; There are well in rock core central authorities, described well is in rock core top end cap central bore, hole depth runs through whole rock core, but do not drill lower end cap, distribute centered by well 5 ~ 10 at rock core top end cap and go deep into the boring of rock core, between each boring, line is swirl shape successively, and Resistance probe is placed in this boring, and probe connects temperature sensor and pressure transducer; The circulation system and electrically heated rod is had, the equal connection data acquisition system of described electrically heated rod, Resistance probe, temperature sensor and pressure transducer in well; The described circulation system is made up of pump and simulation oil pipe, and pump connects well, and the simulation oil pipe being arranged in well connects condenser pipe, and condenser pipe connects mass-flow gas meter.
Sealing rock core is the environment in order to simulate reservoir sealing; Play 5 ~ 10 borings going deep into rock core and between hole successively line be swirl shape, be in order to make to put into 5 ~ 10 Resistance probes wherein and temperature sensor, pressure transducer is uniformly distributed in rock core, as sensing point, make to detect resistance, temperature, pressure parameter data more reasonable; Simulation drilling fluid pumps into Simulated Water lock course of damage in well by the pump in the circulation system, and is gone out by simulated oil tube pump by gas in well in electrical heating solution dewaters lock process; Condenser pipe is the high-temperature gas drilling fluid in the gas pumped in order to condensation, to ensure the accuracy of the gas flow that mass-flow gas meter records.
Utilize said apparatus to dewater to WATER LOCKING DAMAGE OF TIGHT SAND GAS RESERVOIRS infringement and electrical heating solution and be locked into the method for row simulation, comprise the following steps successively:
(1) the air intake opening gas injection toward core-shell is continued by gas cylinder, simulation gas generation process, after observing that gas flow is stable by mass-flow gas meter, by temperature, pressure, the resistance data of data acquisition system (DAS) record now rock core, as the initial value of temperature, pressure, resistance, by mass-flow gas meter record now gas flow, as the initial value of air flow rate;
(2) in well, simulation drilling fluid is pumped into, simulation drilling fluid constantly invades in rock core and hole, cause Water-blocking damage, the water saturation of rock core and hole is constantly increased, permeability constantly reduces, and when gas flow reduces until when tending towards stability, Water-blocking damage reaches maximum, by temperature, pressure, the resistance data of data acquisition system (DAS) record now rock core, by mass-flow gas meter record now gas flow;
(3) surplus drilling fluid in well is pumped by the circulation system, enter electrically heated rod down in the wellbore to heat rock core, the temperature range of heating is 300 ~ 600 DEG C, the simulation drilling fluid that high-temperature heating makes nearly well region invade evaporates and flows into well, by the circulation system, the gas in well and high-temperature gas simulation drilling fluid are gone out well through simulated oil tube pump again, enter condenser pipe, condensing tube condensation simulation drilling fluid, remaining gas enters mass-flow gas meter.Constantly carry out with heating, rock core and hole water saturation reduce gradually, permeability is constantly recovered, by temperature, pressure, the resistance data of data acquisition system (DAS) record now rock core, by mass-flow gas meter record now gas flow, when temperature reaches 600 DEG C, rock core pressure, resistance and gas flow data are close to its initial value, illustrate that Water-blocking damage is removed (if rock core pressure and gas flow data are greater than its initial value, illustrate that the electrical heating solution locked mode plan method that dewaters produces some microfractures, improve the percolation ability on stratum);
(4) close gas cylinder, stop heating and taking out electrically heated rod, whole simulation process terminates.
The present invention by the data variation of data acquisition system (DAS) and mass-flow gas meter record temperature, pressure, resistance and gas flow, by contrast before and after data can be clear and intuitive observe that Water-blocking damage simulation process and the electrical heating solution locked mode that dewaters intends process whether success.By above analogue means successfully solution to dewater lock, the mode that the known mode using electrically heated rod to heat in the small space of down-hole heats the lock thus solution dewaters to immediate vicinity of wellbore water lock reservoir is practicable.Because water lock region is generally present within the scope of 0 ~ 3 meter, immediate vicinity of wellbore, therefore electrically heated rod only needs the ground layer for heating to 0 ~ 3 meter, nearly well.So, adopt the Electric heating solution lock that dewaters can either use the high power heater of current prior art, the heating rod of the size of the hole of requirement of engineering can be met again, the contradictory problems having solved that power is large and equipment size is little required.
Compared with prior art, the invention has the beneficial effects as follows:
(1) water saturation of Water-blocking damage band around hyposmosis Methed of Tight Sandstone Gas Layers pit shaft can, effectively be reduced fast, recover and improve nearly well area formation gas phase permeability, realize that Water-blocking damage gas well capacity occurs to improve, and can not secondary damage be produced;
(2), the expansion of rock in electrical heating process, the volumetric expansion of water and vaporization and surrounding rock distribution of force can be made uneven to the inequality that pit shaft surrounding rock adds heat distribution, thus contribute to producing some microfractures, improve the percolation ability on stratum, above-mentioned gap can be used as the discharge-channel of steam and aqueous water, seam is made at hyposmosis dense sand layer like this without the need to being gone by other means, thus can reduce costs, also can reduce the infringement to hyposmosis tight sand Rotating fields;
(3), the present invention not only can be used for the completion mode that open hole completion is also applicable to the multiple employing metal isolation such as well-cased perforating completion, sieve tube completion, liner completion;
(4), the present invention directly proposes the infringement of a whole set of WATER LOCKING DAMAGE OF TIGHT SAND GAS RESERVOIRS and the electrical heating solution locked mode that dewaters and intends method and apparatus, quick, clear observation water lock course of damage and electrical heating solution to dewater the experimental result of lock process, is convenient to draw experimental data;
(5), analogue means structure of the present invention is simple, and principle is reliable, easy to operate, cost is low, and demand power requirement can be constructed at present accept, therefore can extensively manufacturing goes forward side by side exercises and uses.
Accompanying drawing explanation
Fig. 1 is that WATER LOCKING DAMAGE OF TIGHT SAND GAS RESERVOIRS infringement and the electrical heating solution locked mode that dewaters intends the overall construction drawing of device.
Fig. 2 is the distribution of boreholes vertical view goed deep in rock core.
In figure: 1. end cap; 2. shell; 3. rock core; 4. well; 5. gas cylinder; 6. reduction valve; 7. Resistance probe; 8. pressure transducer; 9. temperature sensor; 10. pump; 11. condenser pipes; 12. mass-flow gas meters; 13. data acquisition system (DAS)s; 14. electrically heated rods; 15. simulation oil pipes.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Referring to Fig. 1, Fig. 2.
WATER LOCKING DAMAGE OF TIGHT SAND GAS RESERVOIRS is damaged and electrical heating solution dewaters, and locked mode intends device, forms primarily of rock core 3, gas cylinder 5, reduction valve 6, Resistance probe 7, pressure transducer 8, temperature sensor 9, the circulation system, condenser pipe 11, mass-flow gas meter 12, data acquisition system (DAS) 13, electrically heated rod 14.
Described rock core 3 skin has shell 2, and there is end cap 1 top and the bottom, are sealing state, and core-shell has air intake opening, and this air intake opening connects reduction valve 6 and gas cylinder 5; There are well 4 in rock core central authorities, and described well 4 is that hole depth runs through whole rock core, but does not drill lower end cap in rock core top end cap central bore; Distribute 5 ~ 10 centered by well 4 at rock core top end cap and go deep into the boring of rock core, between each boring, line is swirl shape (Fig. 2) successively, and Resistance probe 7 is placed in this boring, this probe Bonding pressure sensor 8 and temperature sensor 9; Well 4 li has the circulation system and electrically heated rod 14, and described electrically heated rod 14, Resistance probe 7, pressure transducer 8 and temperature sensor 9 be connection data acquisition system 13 all; The described circulation system is made up of pump 10 and simulation oil pipe 15, and pump 10 connects well 4, and the simulation oil pipe 15 being arranged in well 4 connects condenser pipe 11, and condenser pipe connects mass-flow gas meter 12.
Simulation gas generation process: continue the air intake opening gas injection toward shell 2 by gas cylinder 5, after observing that gas flow is stable by mass-flow gas meter 12, temperature, pressure, the resistance data of now rock core 3 is recorded by data acquisition system (DAS) 13, as the initial value of temperature, pressure, resistance, now gas flow is recorded, as the initial value of air flow rate by mass-flow gas meter 12.
After simulation gas generation process completes, Simulated Water lock course of damage: pump into simulation drilling fluid by the circulation system in well 4.Observe gas flow change by mass-flow gas meter 12, after gas flow is stable, records temperature, pressure, the resistance data situation of now rock core 3 by data acquisition system (DAS) 13, record now gas flow by mass-flow gas meter 12.
After pumping into simulation drilling fluid in well 4, simulation drilling fluid can constantly invade in rock core 3 and hole, and cause Water-blocking damage, this process is Water-blocking damage simulation process.Because simulation drilling fluid constantly invades rock core 3, its water saturation is constantly increased, rock core 3 and pore permeability constantly reduce, the gas flow then passed through constantly reduces, and is considered as gas production rate in Water-blocking damage process and reduces gradually, and simulating drilling fluid can increase resistance simultaneously.Therefore can monitor in data acquisition system (DAS) 13, the pressure that each sensing point records will constantly reduce, and resistance will constantly increase, and temperature remains unchanged; In mass-flow gas meter 12, gas-monitoring flow constantly reduces.When gas flow reduces until when tending towards stability, illustrate that Water-blocking damage reaches maximum, Water-blocking damage has been simulated.Now the value of pressure, gas flow is all less than initial value, and resistance value is greater than initial value.
After Water-blocking damage has been simulated, analog solution dewaters lock process: isolate surplus drilling fluid in well 4 by the circulation system, enter electrically heated rod 14 under in well 4, open electrically heated rod 14 and heat, regulate and control electrically heated rod 14 temperature by data acquisition system (DAS) 13.By observing gas flow change at mass-flow gas meter 12, after gas flow is stable, record temperature, pressure, the resistance data situation of now rock core 3 by data acquisition system (DAS) 13, by recording now gas flow at mass-flow gas meter 12.
Enter down electrically heated rod 14 pairs of rock cores 3 in the wellbore when heating, the temperature range of heating is 300 ~ 600 DEG C, utilize the simulation drilling fluid that high-temperature heating nearly well 4 region invades, make it to evaporate and flow into well 4 and isolate well 4 by the circulation system again, after removing gaseous state simulation drilling fluid by condenser pipe 11, be transferred to mass-flow gas meter 12, gas flow is monitored.Because the simulation drilling fluid invading rock core 3 constantly evaporates, then rock core 3 and hole water saturation constantly reduce, and permeability is constantly recovered, and the gas flow passed through constantly increases, and are considered as removing gas production rate in Water-blocking damage process and recover gradually.Monitor in data acquisition system (DAS) 13, the pressure that each sensing point records, temperature constantly increase, resistance constantly reduces; In mass-flow gas meter 12, monitor gas flow constantly increase.After gas flow tends towards stability gradually, now pressure, resistance and gas flow data are close to its initial value, illustrate that rock core 3 removes Water-blocking damage, substantially return to not by the state before water enchroachment (invasion), and the electrical heating solution locked mode that dewaters has been intended.If now rock core 3 gas flow data is greater than its initial value, illustrates that the electrical heating solution locked mode plan method that dewaters produces some microfractures, improve the percolation ability on stratum.
Claims (3)
1. WATER LOCKING DAMAGE OF TIGHT SAND GAS RESERVOIRS infringement and electrical heating solution dewater locked mode intend device, primarily of rock core (3), gas cylinder (5), reduction valve (6), Resistance probe (7), pressure transducer (8), temperature sensor (9), the circulation system, condenser pipe (11), mass-flow gas meter (12), data acquisition system (DAS) (13), electrically heated rod (14) forms, it is characterized in that, described rock core (3) skin has shell (2), there is end cap (1) top and the bottom, be sealing state, core-shell has air intake opening, this air intake opening connects reduction valve (6) and gas cylinder (5), there are well (4) in rock core central authorities, and described well (4) is that hole depth runs through whole rock core, but does not drill lower end cap in rock core top end cap central bore, distribute 5 ~ 10 centered by well (4) at rock core top end cap and go deep into the boring of rock core, Resistance probe (7) is placed in this boring, this probe Bonding pressure sensor (8) and temperature sensor (9), well (4) is inner the circulation system and electrically heated rod (14), and described electrically heated rod (14), Resistance probe (7), pressure transducer (8) and temperature sensor (9) be connection data acquisition system (13) all, the described circulation system is made up of pump (10) and simulation oil pipe (15), pump (10) connects well (4), the simulation oil pipe (15) being arranged in well (4) connects condenser pipe (11), and condenser pipe connects mass-flow gas meter (12).
2. WATER LOCKING DAMAGE OF TIGHT SAND GAS RESERVOIRS infringement as claimed in claim 1 and the electrical heating solution locked mode that dewaters intends device, it is characterized in that, distribute 5 ~ 10 centered by well (4) at rock core top end cap and go deep into the boring of rock core, between each boring, line is swirl shape successively.
3. utilize the device described in claim 1,2 to dewater to WATER LOCKING DAMAGE OF TIGHT SAND GAS RESERVOIRS infringement and electrical heating solution and be locked into the method for row simulation, comprise the following steps successively:
(1) the air intake opening gas injection toward core-shell is continued by gas cylinder, simulation gas generation process, after observing that gas flow is stable by mass-flow gas meter, by temperature, pressure, the resistance data of data acquisition system (DAS) record now rock core, as the initial value of temperature, pressure, resistance, by mass-flow gas meter record now gas flow, as the initial value of air flow rate;
(2) in well, simulation drilling fluid is pumped into, simulation drilling fluid constantly invades in rock core and hole, cause Water-blocking damage, the water saturation of rock core and hole is constantly increased, permeability constantly reduces, and when gas flow reduces until when tending towards stability, Water-blocking damage reaches maximum, by temperature, pressure, the resistance data of data acquisition system (DAS) record now rock core, by mass-flow gas meter record now gas flow;
(3) surplus drilling fluid in well is pumped by the circulation system, enter electrically heated rod down in the wellbore to heat rock core, the temperature range of heating is 300 ~ 600 DEG C, the simulation drilling fluid that high-temperature heating makes nearly well region invade evaporates and flows into well, by the circulation system, the gas in well and high-temperature gas simulation drilling fluid are gone out well through simulated oil tube pump again, enter condenser pipe, condensing tube condensation simulation drilling fluid, remaining gas enters mass-flow gas meter, constantly carry out with heating, rock core and hole water saturation reduce gradually, permeability is constantly recovered, by the temperature of data acquisition system (DAS) record now rock core, pressure, resistance data, by mass-flow gas meter record now gas flow, when temperature reaches 600 DEG C, rock core pressure, resistance and gas flow data are close to its initial value, Water-blocking damage is removed,
(4) close gas cylinder, stop heating and taking out electrically heated rod, whole simulation process terminates.
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| CN201510889015.2A CN105319329B (en) | 2015-12-06 | 2015-12-06 | WATER LOCKING DAMAGE OF TIGHT SAND GAS RESERVOIRS is damaged and electrical heating solution eliminating water locked mode intends apparatus and method |
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| CN105756674A (en) * | 2016-04-12 | 2016-07-13 | 西南石油大学 | Crack-substrate coupling flow damage evaluating device and method by simulating formation conditions |
| CN105807001A (en) * | 2016-03-29 | 2016-07-27 | 中国石油大学(华东) | Method for evaluating water lock damage to oil reservoir |
| CN106867620A (en) * | 2017-04-12 | 2017-06-20 | 太原科技大学 | For the microwave desulfurization intelligent integrated experimental system of sulphur coal |
| CN108240953A (en) * | 2016-12-27 | 2018-07-03 | 中国石油天然气股份有限公司 | A kind of barite de-plugging agent device for evaluating performance and its evaluation method |
| CN111006988A (en) * | 2019-12-31 | 2020-04-14 | 西南石油大学 | Carbon dioxide imbibition diffusion oil extraction experimental device in tight oil reservoir |
| CN113236211A (en) * | 2021-06-01 | 2021-08-10 | 西南石油大学 | Device and method for removing water phase trapping damage through underground eddy heat shock of tight reservoir |
| CN116297110A (en) * | 2023-05-18 | 2023-06-23 | 西南石油大学 | Carbon dioxide sealing simulation system and application method |
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| CN105807001A (en) * | 2016-03-29 | 2016-07-27 | 中国石油大学(华东) | Method for evaluating water lock damage to oil reservoir |
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| CN108240953A (en) * | 2016-12-27 | 2018-07-03 | 中国石油天然气股份有限公司 | A kind of barite de-plugging agent device for evaluating performance and its evaluation method |
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| CN106867620A (en) * | 2017-04-12 | 2017-06-20 | 太原科技大学 | For the microwave desulfurization intelligent integrated experimental system of sulphur coal |
| CN106867620B (en) * | 2017-04-12 | 2023-03-24 | 太原科技大学 | Microwave desulfurization intelligent integrated experimental system for high-sulfur coal |
| CN111006988A (en) * | 2019-12-31 | 2020-04-14 | 西南石油大学 | Carbon dioxide imbibition diffusion oil extraction experimental device in tight oil reservoir |
| CN113236211A (en) * | 2021-06-01 | 2021-08-10 | 西南石油大学 | Device and method for removing water phase trapping damage through underground eddy heat shock of tight reservoir |
| CN116297110A (en) * | 2023-05-18 | 2023-06-23 | 西南石油大学 | Carbon dioxide sealing simulation system and application method |
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