CN112983366A - Method and device for removing water phase trapping damage of tight reservoir in large range - Google Patents
Method and device for removing water phase trapping damage of tight reservoir in large range Download PDFInfo
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- CN112983366A CN112983366A CN202110416396.8A CN202110416396A CN112983366A CN 112983366 A CN112983366 A CN 112983366A CN 202110416396 A CN202110416396 A CN 202110416396A CN 112983366 A CN112983366 A CN 112983366A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000006378 damage Effects 0.000 title claims abstract description 32
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 166
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 80
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 239000007789 gas Substances 0.000 claims abstract description 17
- 238000011084 recovery Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims description 2
- 238000012546 transfer Methods 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 abstract description 4
- 230000035699 permeability Effects 0.000 abstract description 2
- 238000002407 reforming Methods 0.000 abstract description 2
- 239000011435 rock Substances 0.000 abstract 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 102220498074 Transmembrane 4 L6 family member 20_N80Q_mutation Human genes 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2401—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection by means of electricity
Abstract
The invention discloses a method and a device for removing water phase trapping damage of a tight reservoir in a large range. The method comprises the steps of reforming an oil pipe to enable an oil pipe main body to be a high-temperature heating device, injecting nitrogen into the oil pipe from a wellhead, heating the nitrogen through forced convection heat exchange with the surface of the oil pipe to form high-temperature hot dry gas when the nitrogen reaches a reservoir interval, and then injecting the hot dry gas into the reservoir through pressurization. The nitrogen heats the water phase in two modes, firstly, the nitrogen contacts with the rock to generate forced convection heat transfer to heat the rock, the rock is heated and then the water phase in contact with the rock is heated, and then the nitrogen directly contacts with the water phase to generate forced convection heat transfer to directly heat liquid water. High-temperature hot nitrogen can enter the deep part of the reservoir along the crack to realize large-scale reservoir heating, remove water phase trapping damage in the heating area, improve the permeability of the reservoir by utilizing high temperature, and avoid secondary damage to the reservoir.
Description
Technical Field
The invention relates to a method and a device for removing water phase trapping damage of a tight reservoir in a large range, which can remove the water phase trapping damage of the reservoir and improve the recovery ratio of a tight gas reservoir.
Background
The field of the development of compact sandstone gas reservoir in China is widerIn more than ten basin regions such as pseudo-sonnel, Tarim, Bohai Bay, Songliao, chada, Ordos and Sichuan, important conditions for storing the compact sandstone gas reservoir exist, and the amount of distant view resources cannot be estimated. With the development of exploration technology in China and the continuous improvement of geological understanding, the development work of compact sandstone gas reservoirs in Ordos and Sichuan basins has made certain progress, and 2 trillion-cubic-scale compact gas areas of Ordos Surieger and Sichuan basin beard family river groups are discovered successively. In terms of exploration of reserves and technical strength, the compact sandstone gas reservoir is an unconventional natural gas resource which has the most practical exploration and development significance in China. But the compact sandstone reservoir has poor physical property, wide distribution area, strong diagenesis, secondary pore development, rich authigenic mineral content, poor separation and low local water saturation. Generally do not have natural productivity and need to be developed by hydraulic fracturing to form a fracture network. The fracturing scale is large, the dosage of the fracturing fluid is large, and the single-well fracturing fluid can reach (2-4) x 104m3However, the difficulty of flowback of the fracturing fluid is high, and the flowback rate is often lower than 50%. The reservoir bed with the pressure fluid stagnation generates water phase trap damage, and the seepage capability of the compact sandstone gas is seriously influenced. There is therefore a great need for an economical, reliable and environmentally friendly method and a systematic device for the destruction of aqueous traps.
At present, a plurality of methods for removing the water phase trapping damage are available, such as acidification, surface activity injection, high-temperature evaporation and fire reservoir formation and the like. However, some of the methods have low efficiency, some methods have high economic cost, and some methods have great realization difficulty and are not suitable for the actual situation of the existing engineering.
Compared with the method and the device for removing the water phase trap damage of the low-permeability compact sandstone gas layer disclosed by the Chinese patent publication No. CN 102536165A, the method mainly generates microwaves through a microwave generating device in a shaft and transmits the microwaves to a reservoir, the microwaves enable internal molecules of liquid water to resonate to generate molecular heat, so that the liquid water is heated and changed into water vapor, and the water phase trap damage is removed.
Compared with the underground cable-free variable-frequency electric heating oil production device disclosed in Chinese patent publication No. CN 2209692Y, the underground cable-free variable-frequency electric heating oil production device helps recovery of thick oil by heating underground, and the thick oil recovery device does not remove reservoir damage by heating, but improves the fluidity of thick oil by high temperature, so that the recovery ratio of thick oil is improved.
In addition, methods for removing the water trap damage of the reservoir by underground electric heating are available, and the methods have the common characteristics of low heat energy utilization rate and poor economy.
Disclosure of Invention
The invention solves the technical problem of providing a method and a device for removing the water phase trapping damage of a compact reservoir in a large range. Thereby make oil pipe can the circular telegram become high temperature heating device through reforming transform oil pipe, inject nitrogen gas to oil pipe from the well head, thereby nitrogen gas and oil pipe internal surface carry out the forced convection heat transfer and heat nitrogen gas, pressurize nitrogen gas after arriving the bottom of the well reservoir section, nitrogen gas brings the heat into the reservoir through the fracture, heat gets into behind the reservoir high temperature and evaporates liquid water for vapor, the flowback stage utilizes pressure differential with vapor and nitrogen gas to derive from oil pipe, reaches the purpose of removing the damage of water phase trap.
Further, the method comprises the following steps: and after the temperature of the oil pipe reaches the required temperature, injecting nitrogen into the oil pipe, pressurizing the oil pipe by using a pressurizing pump after the nitrogen is filled in the oil pipe under the constant pressure condition, and gradually introducing the high-temperature hot nitrogen at the bottom layer into the reservoir after pressurization.
Further, the method comprises the following steps: the required temperature for water evaporation into steam under the target reservoir pressure can be calculated through heat and mass transfer science, nitrogen related thermodynamic parameters can be determined according to data and experiment combination, an unsteady heat transfer model is established, and the heating time is estimated. The heating time T is estimated by the following formula:
in the formula: t represents the predicted time for heating the reservoir by hot nitrogen; t represents the temperature of nitrogen entering the reservoir; λ represents nitrogen thermal conductivity; c. CpRepresents the specific heat capacity at constant pressure of nitrogen; ρ represents the nitrogen density; r represents a heating range radius; u represents the nitrogen flow rate in the r direction; phi represents a perforation phase angle; v represents the nitrogen flow rate in the direction of r off.
Further, the method comprises the following steps: and when the time for injecting the nitrogen under pressure reaches T, stopping injecting the nitrogen, then entering a flow-back stage, judging the finish time of the flow-back stage by a humidity detection device at the opening of the oil pipe, and when the humidity of the flow-back gas at the opening of the oil pipe does not change along with the change of time, considering that the flow-back is finished, and removing the water phase trapping damage.
The invention also provides a device for the method, in particular to a device for removing the water trap damage of the tight reservoir, which comprises a detection system, a power supply system, a nitrogen system, a casing annulus packer and a modified oil pipe.
Further, the method comprises the following steps: the improved oil pipe is characterized in that the two ends of the oil pipe are additionally provided with the electrifying control devices, so that the oil pipe is changed into a conductor and then is electrified to generate heat, the heating temperature of the oil pipe is changed by changing the voltage loaded on the oil pipe, the oil pipe is generally made of N80Q, J55 and the like, and the temperature required by nitrogen heating can be met after the oil pipe is electrified (the API standard petroleum pipeline can bear the high temperature of over 600 ℃).
Further, the method comprises the following steps: and a heat insulation layer is arranged outside the modified oil pipe.
Further, the method comprises the following steps: the casing annulus packer is arranged at the upper boundary part between the oil pipe and the casing and in the reservoir area and used for preventing high-temperature nitrogen from escaping upwards through the casing annulus.
Further, the method comprises the following steps: the measuring system comprises a temperature detecting device arranged in an underground reservoir section and used for detecting the temperature of nitrogen entering the reservoir, and a humidity detecting device arranged at a wellhead and used for measuring the humidity of the flowback gas.
Further, the method comprises the following steps: the nitrogen system comprises a nitrogen generator, a pressurizing pump and a nitrogen recovery processing device which are connected through pipelines
Further, the method comprises the following steps: the nitrogen recovery treatment equipment comprises a dry-wet separator and an impurity separator which are connected in series and connected with a nitrogen storage tank through a pipeline.
The invention has the advantages and beneficial effects that:
1. the method can safely, reliably and environmentally-friendly remove the water phase trap damage of the compact sandstone reservoir, recover the permeability of the reservoir and avoid secondary damage to the reservoir;
2. the water phase trapping damage of the reservoir can be relieved in a large range, and because heat is brought into the reservoir through gas, the gas can move along with the fracture, so that the method for relieving the water phase trapping damage is not limited to the near wellbore area;
3. the heat energy utilization rate is high, the method only performs heat exchange of the oil pipe to nitrogen in the heat exchange process, the heat is efficiently brought into a reservoir by the nitrogen, the heat loss is small, and the economy is high;
4. the realization difficulty is small, the principle is reliable, and the damage to well completion measures such as a sleeve and the like caused by high temperature in other underground heating modes is avoided;
5. the method has small limitation, can be suitable for any drilling and completion mode, and is not limited in use.
Drawings
FIG. 1 is a flow chart of the present invention in the well site construction process
In the figure: 1 denotes a power supply system, 2 denotes a nitrogen generator, 3 denotes a nitrogen recovery processing device, 4 denotes a nitrogen storage tank, 5 denotes a thermal insulation layer, 6 denotes a casing, 7 denotes a casing annulus packer, 8 denotes a tubing, 9 denotes a reservoir section perforation fracture, 10 denotes a galvanic thermometer, and 11 denotes a humidity detection device.
FIG. 2 is a schematic view of the main structure of the tubing system and a schematic view of the packer sealing
In the figure: reference numeral 12 denotes an energization control device, and 13 denotes a high-voltage cable.
FIG. 3 is a schematic view of the interior of the nitrogen system
In the figure: 14 denotes a pressure pump, 15 denotes a wet-dry separator, and 16 denotes an impurity separator.
Detailed Description
The invention will be further explained with reference to the drawings.
See fig. 1, fig. 2, fig. 3.
The lower opening of the oil pipe 8 is provided with an electric couple type thermometer 10, the oil pipe 8 is externally connected with a nitrogen generator 2 during heating, power is supplied through a power supply system 1, variable frequency adjustment of voltage is carried out through an electrifying control device 12, the oil pipe is externally connected with nitrogen recovery processing equipment 3 during flowback, and a casing annulus packer 7 is arranged between the outside of the oil pipe 8 and the casing 6 in a reservoir section area.
The nitrogen generator 2 also comprises a pressure pump 14, and the nitrogen recovery processing device 3 is internally provided with a dry-wet separator 15 and an impurity separator 16. After the oil pipe 8 is electrified to reach the target temperature, the nitrogen generator 2 starts to inject nitrogen into the oil pipe 8, and after the oil pipe 8 is filled with nitrogen under the condition of constant pressure, the nitrogen pressure is adjusted according to the temperature of the nitrogen measured by the target area couple thermometer 10, and the nitrogen is injected in a pressurizing mode through the pressurizing pump 14.
The heating time T is estimated by the following formula:
in the formula: t represents the predicted time for heating the reservoir by hot nitrogen; t represents the temperature of nitrogen entering the reservoir; λ represents nitrogen thermal conductivity; c. CpRepresents the specific heat capacity at constant pressure of nitrogen; ρ represents the nitrogen density; r represents a heating range radius; u represents the nitrogen flow rate in the r direction; phi represents a perforation phase angle; v represents the nitrogen flow rate in the direction of r off.
And stopping the nitrogen generator 2 after the estimated heating time T is reached, immediately entering a flow-back stage, enabling the mixed gas (natural gas, nitrogen, water vapor and the like) flowing back to enter nitrogen recovery processing equipment 3, then passing through a dry-wet separator 15, then passing through an impurity separator 16, and finally entering a storage tank 4 for storage for later use as pure nitrogen.
The humidity of the flowback gas is detected through the wellhead humidity detection device 11, when the humidity does not change along with the change of time any more, the flowback is considered to be finished, and the whole water phase trapping damage removing process is finished.
Claims (7)
1. A method and a device for removing the water phase trapping damage of a compact reservoir in a large range are characterized in that an oil pipe is transformed into a high-temperature heating device, nitrogen is injected into the oil pipe through a well mouth, the nitrogen and the inner surface of the oil pipe perform forced convection heat exchange to heat the nitrogen, the nitrogen is converted into high-temperature hot nitrogen after reaching a reservoir section at the bottom of a well and then is pressurized to enter the reservoir, and water vapor and the nitrogen are led out of the oil pipe by utilizing pressure difference in a backflow stage, so that the purpose of removing the water phase trapping damage is achieved.
2. The method for extensively relieving tight reservoir water entrapment damage of claim 1 wherein the high temperature nitrogen reaches the reservoir interval and enters the reservoir via pressurization along the pores, fractures or perforations, and tubing packers are used to prevent the high temperature nitrogen from escaping up the casing annulus.
3. The method for wide-ranging release of tight reservoir water trapping damage of claim 1, wherein the heating time T is estimated by the following formula: .
In the formula: t represents the predicted time for heating the reservoir by hot nitrogen; t represents the temperature of nitrogen entering the reservoir; λ represents nitrogen thermal conductivity; c. CpRepresents the specific heat capacity at constant pressure of nitrogen; ρ represents the nitrogen density; r represents a heating range radius; u represents the nitrogen flow rate in the r direction; phi represents a perforation phase angle; v represents the nitrogen flow rate in the direction of r off.
4. The method for removing the water phase trapping damage of the tight reservoir in the large range according to claim 1, wherein the flow-back stage is immediately carried out after the nitrogen injection is stopped, the humidity of the flow-back gas is detected through a wellhead humidity detection device, and the flow-back is considered to be finished when the humidity does not change along with the change of time any more.
5. Remove device of tight reservoir water trap harm on a large scale, its characterized in that, the device includes detecting system, power supply system, nitrogen system, sleeve pipe annular space packer and reforms transform oil pipe, reform transform oil pipe and install the circular telegram controlling means additional through both ends about oil pipe, the heat-insulating layer that covers outward, then link to each other through high-voltage cable and ground power supply system.
6. The device for extensively removing tight reservoir water trapping damage according to claims 1 and 5, wherein said detection system comprises a subsurface temperature detection device installed at the lower opening of the tubing and a wellhead humidity detection device, and said casing annulus packer is installed between the tubing and the casing at the upper boundary portion of the reservoir area.
7. The device for removing the water trap damage of the tight reservoir in a large range according to claims 1 and 5, wherein the nitrogen system consists of a nitrogen generator and a nitrogen recovery processing device, the nitrogen generator is internally provided with a pressurizing pump and is connected with an external nitrogen storage tank through a pipeline, and the nitrogen recovery processing device is connected with the external nitrogen storage tank through a pipeline and is internally provided with an impurity separator and a dry-wet separator which are connected in series.
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| CN202110416396.8A CN112983366A (en) | 2021-04-19 | 2021-04-19 | Method and device for removing water phase trapping damage of tight reservoir in large range |
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| CN202110416396.8A CN112983366A (en) | 2021-04-19 | 2021-04-19 | Method and device for removing water phase trapping damage of tight reservoir in large range |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113266327A (en) * | 2021-07-05 | 2021-08-17 | 西南石油大学 | Oil gas underground multifunctional eddy heating device and method |
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