CN106639997B - Device and method for reducing viscosity of heavy oil by injecting agent through high-pressure water jet of continuous oil pipe - Google Patents
Device and method for reducing viscosity of heavy oil by injecting agent through high-pressure water jet of continuous oil pipe Download PDFInfo
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- CN106639997B CN106639997B CN201611101127.8A CN201611101127A CN106639997B CN 106639997 B CN106639997 B CN 106639997B CN 201611101127 A CN201611101127 A CN 201611101127A CN 106639997 B CN106639997 B CN 106639997B
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- 239000003921 oil Substances 0.000 title claims abstract description 145
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 239000000295 fuel oil Substances 0.000 title claims abstract description 16
- 230000009467 reduction Effects 0.000 claims abstract description 43
- 239000007921 spray Substances 0.000 claims abstract description 35
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 33
- 238000002347 injection Methods 0.000 claims abstract description 17
- 239000007924 injection Substances 0.000 claims abstract description 17
- 238000003860 storage Methods 0.000 claims abstract description 12
- 238000002018 water-jet injection Methods 0.000 claims description 15
- 238000005086 pumping Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 3
- 230000001133 acceleration Effects 0.000 claims description 2
- 230000005484 gravity Effects 0.000 claims description 2
- 230000032258 transport Effects 0.000 claims description 2
- 239000010779 crude oil Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000005553 drilling Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 239000003814 drug Substances 0.000 description 5
- 238000005485 electric heating Methods 0.000 description 5
- 239000003129 oil well Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000003208 petroleum Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000004321 preservation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000013543 active substance Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000013043 chemical agent Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 238000010793 Steam injection (oil industry) Methods 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000009775 high-speed stirring Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/20—Displacing by water
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
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Abstract
The invention provides a device and a method for reducing viscosity of heavy oil by injecting a high-pressure water jet into a continuous oil pipe. The high-pressure water jet agent injection thick oil viscosity reduction device for the continuous oil pipe comprises: the viscosity-reducing agent storage device is arranged on the ground; the circulating pump is arranged on the ground and connected with the viscosity-reducing agent storage device; the pressure pump is connected with the circulating pump; the coiled tubing truck is arranged on the ground, a coiled tubing is arranged on the coiled tubing truck, and the coiled tubing is connected with the pressure pump; the wellhead device is arranged on a wellhead, and the coiled tubing penetrates through the wellhead device and extends into the wellhead; and the rotary spray head is arranged in the wellhead and positioned below the wellhead device, and the rotary spray head is connected to the tail end of the continuous oil pipe. The viscosity reduction method of the heavy oil by injecting the agent by the high-pressure water jet of the continuous oil pipe adopts the viscosity reduction device by injecting the agent by the high-pressure water jet of the continuous oil pipe. The invention has the advantages of high efficiency, simplicity, convenience, safety and low cost, and can be matched with the existing oil fishing vehicle for operation.
Description
Technical Field
The invention relates to the technical field of petroleum exploitation, in particular to the field of viscosity reduction of thick oil, namely a device and a method for viscosity reduction of thick oil by high-pressure water jet injection of a coiled tubing.
Background
When the output of most of heavy oil and extra heavy oil wells is reduced to the bottom limit, in order to reduce the gas injection cost, the heavy oil and extra heavy oil wells can only be stopped and discarded, but a plurality of wells still have reserves, and an intermittent oil production-oil fishing vehicle can be used for fishing oil. After stopping production for a period of time, the liquid level gradually rises, the temperature drops when the liquid level is close to the ground, a thick oil dead oil cap layer is formed in the sleeve by crude oil, the oil cap is thicker and thicker, the existing oil bailing vehicle technology cannot enter a well to carry out oil bailing operation, and the number of thick oil wells stopped due to low production is increased continuously every year.
In the past, measures such as well closing viscosity reduction by chemical injection at a well head, electric heating and the like are tried for pumping oil in a heavy oil well, the injection cannot permeate into the surface of an oil layer, the viscosity reduction effect is not obvious, the electric heating period is long, and the cost is high, so that the method cannot be popularized. For the shut-in and shut-off wells, oil can not be fished out without special measures, and most well sites are under the conditions of no water and no electricity, so that no effective technical method is provided for solving the actual problems, which is a technical problem for many years, and lots of wells which are shut-in and discarded still have reserves and can not be fished out, thereby forming huge resource waste.
In summary, the following problems exist in the prior art: the prior method is difficult to conveniently and effectively solve the problem of viscosity reduction of thick oil.
Disclosure of Invention
The invention provides a device and a method for reducing viscosity of thick oil by injecting a continuous oil pipe high-pressure water jet agent, and aims to solve the problem of reducing viscosity of thick oil by a novel thick oil exploitation technology.
Therefore, the invention provides a coiled tubing high-pressure water jet injection thick oil viscosity reduction device, which comprises:
the viscosity-reducing agent storage device is arranged on the ground;
the circulating pump is arranged on the ground and connected with the viscosity-reducing agent storage device;
the pressure pump is connected with the circulating pump;
the coiled tubing truck is arranged on the ground, a coiled tubing is arranged on the coiled tubing truck, and the coiled tubing is connected with the pressure pump;
the wellhead device is arranged on a wellhead, and the coiled tubing penetrates through the wellhead device and extends into the wellhead;
and the rotary spray head is arranged in the wellhead and positioned below the wellhead device, and the rotary spray head is connected to the tail end of the continuous oil pipe.
Further, the coiled tubing high-pressure water jet injection thick oil viscosity reduction device further comprises: and the rotary sealer is arranged on the coiled tubing truck and connected with the coiled tubing, and seals the upper tube and the lower tube of the coiled tubing.
Furthermore, the coiled tubing is a special petroleum CT-80 coiled tubing, the length is 2200-3200 meters, the outer diameter is 16-25mm, the inner diameter is 13-22mm, the working pressure is 80-100Mpa, the discharge capacity is 80L/min, the tensile strength is 4T, and the maximum working depth is 3000 meters.
Further, the coiled tubing high-pressure water jet injection thick oil viscosity reduction device further comprises: and the pipe arranger is arranged on the continuous oil pipe vehicle and is connected with the continuous oil pipe.
Further, the wellhead assembly includes: and the hydraulic seal box is used for sealing the continuous oil pipe.
Furthermore, the viscosity reduction medicament storage device is a medicament vehicle, and a heat preservation box for preserving the temperature of the viscosity reduction medicament is arranged on the medicament vehicle.
The invention also provides a high-pressure water jet injection agent thick oil viscosity reduction method for the coiled tubing, which adopts a high-pressure water jet injection agent thick oil viscosity reduction device for the coiled tubing, and comprises the following steps:
a, connecting a rotary spray head to the tail end of a coiled tubing, and putting the rotary spray head and the coiled tubing into the well;
step B, after the rotary nozzle reaches a thick oil interface in the well, the viscosity-reducing agent is conveyed to the continuous oil pipe and the rotary nozzle on the ground through pumping and pressurization;
and step C, the rotary spray head sprays the pressurized viscosity reduction agent, and the continuous oil pipe continuously enters the rotary spray head while spraying.
Further, through full-automatic top tube and the low tube that realizes coiled tubing of hydraulic winch, top tube and low tube adopt hydraulic reducer to prevent the coaster, and low tube speed reaches at most: 60 m/min, top tube speed up to a maximum: 80 m/min.
Further, the temperature of the viscosity reducing agent is controlled on the ground, so that the viscosity reducing agent is uniformly mixed with the thick oil at 35-55 ℃ underground.
Furthermore, the rotary spray head is provided with two front nozzles and six rear nozzles, the two front nozzles rotate to cut open, the six rear nozzles generate rear ejection force, and the rotating speed of the rotary spray head is 1500-3000r/min.
The invention is connected with a rotary nozzle through a continuous oil pipe vehicle and sent to the underground, after the rotary nozzle reaches a thick oil interface, a ground high-pressure pump pressurizes, and the injection agent is injected by jet flow, stirred at high speed and locally forms cavitation, so that the thick oil in a shaft is quickly reduced into thin oil, and the nozzle continuously drills.
The invention has the advantages of high efficiency, simplicity, safety and low cost, can be matched with the prior oil bailing vehicle for operation, and can bail oil without any measure for thick oil wells and additional power sources for well fields. Can save a large number of thick oil wells which stop production due to low production, and can quickly improve the yield, and is a brand new intermittent thick oil exploitation technical means.
In the invention, the agent injection, the stirring and the drilling are simultaneously finished by the rotary spray head, the dead oil cap of the thickened oil in the shaft is dredged, and the viscosity of the thickened oil and the ultra-thickened oil is rapidly reduced, so that the thickened oil can be conveniently salvaged to the ground by the existing oil bailing vehicle.
The invention has the following technical effects:
1. the measures such as electric heating, steam injection and the like are not needed for the working thick oil well, the oil recovery method is used for oil recovery after a certain amount of thick oil is gathered in the shaft by the aid of the self force of the oil reservoir, a large amount of cost is saved, and thick oil resources which cannot be recovered are coiled;
2. drilling/stirring/chemical viscosity reduction are combined during operation, a drilling tool is not required to be replaced in the middle of continuous pipe operation, the operation is efficient, and more than 4 wells can be constructed in one day;
3. the comprehensive viscosity reduction effect is good, and 2000 parts of the well bottom are under the combined influence of physical and chemical actions after the operation is started mPa.s -30 ten thousand mPa.s The thick oil can be quickly reduced to dozens of viscosity mPa.s The oil fishing vehicle can easily operate;
4. can be easily expanded to the fields needing other chemical agent treatments, such as production increase and blockage removal.
Drawings
FIG. 1 is a schematic structural diagram of a coiled tubing high-pressure water jet injection agent heavy oil viscosity reduction device of the present invention;
FIG. 2 is a working schematic diagram of the coiled tubing high-pressure water jet injection thick oil viscosity reduction method of the present invention.
The reference numbers illustrate:
1 viscosity reduction medicament storage device 2 circulating pump 3 booster pump 4 continuous oil pipe truck 40 continuous oil pipe 5 fixed pulley 6 well head device 7 tank wagon 8 pit shaft 80 thick oil layer 9 rotating nozzle
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, the present invention will now be described with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, the device for reducing viscosity of heavy oil by injecting agent into coiled tubing by high-pressure water jet comprises:
the viscosity reduction agent storage device 1 is arranged on the ground or outside a well head, the viscosity reduction agent storage device 1 is filled with a viscosity reduction agent which is an anion and nonionic active agent so as to reduce the viscosity of the thick oil into finer powder after high-pressure stirring, and the fluidity is excellent;
the circulating pump 2 is arranged on the ground, is connected with the viscosity-reducing agent storage device 1 through a pipeline and is used for pumping the viscosity-reducing agent;
the pressure pump 3 is also called a high-pressure pump and is connected with the circulating pump 2 through a pipeline to pressurize the viscosity reducing agent; pressurizing up to 100MPa;
the continuous oil pipe trolley 4 is arranged on the ground, a continuous oil pipe 40 is arranged on the continuous oil pipe trolley 4, and the continuous oil pipe is connected with the pressure pump 3; the continuous oil pipe vehicle 4 can be used as an operation platform, and the continuous oil pipe vehicle 4 can be provided with an automatic controller for controlling the conveying amount of the viscosity reducing agent, and monitoring the pressure, the discharge capacity, the finger depth and the upper and lower pipe speeds; the continuous oil pipe vehicle 4 is provided with power, so that the invention can independently complete the operation without any water and electricity provided by a well site;
the wellhead device 6 is arranged on the wellhead and used for sealing the wellhead, providing safety operation guarantee for high-pressure safety operation and providing a conveying port for outputting petroleum after viscosity reduction and dilution, and the continuous oil pipe 40 penetrates through the wellhead device 6 and extends into the wellhead;
and the rotary spray head 9 is arranged in a well and is positioned below the well head device 6, and the rotary spray head 9 is connected to the tail end of the coiled tubing 40. The rotary spray head 9 extends into the thick oil layer 80 and is connected with the rotary spray head through a continuous oil pipe vehicle to be sent to the underground, after the rotary spray head reaches a thick oil interface, a ground high-pressure pump pressurizes, and jet injection agent (viscosity reducing agent) is injected, stirred at high speed and locally forms cavitation, so that the thick oil in a shaft is quickly reduced to thin oil, and meanwhile, the rotary spray head continuously drills in the thick oil layer 80 and gradually extends into the thick oil layer 80 until the thick oil layer 80 is completely reduced in viscosity and diluted. The rotary sprayer 9 may be a commercially available high-speed rotary sprayer.
Further, the coiled tubing high-pressure water jet injection thick oil viscosity reduction device further comprises: and the oil tank truck 7 or the oil fishing truck connected to the wellhead device 6 collects the diluted thin oil from the underground to the ground and transports the diluted thin oil away. Namely, the crude oil is fished away after being diluted. The invention has flexible operation, convenience and rapidness, only needs about 1 hour for operating one well, and can recover the production of a large number of production stopping wells by cooperating with the thick oil fishing vehicle.
Further, the coiled tubing high-pressure water jet injection thick oil viscosity reduction device further comprises: and the rotary sealer is arranged on the coiled tubing truck and connected with the coiled tubing, and seals an upper tube and a lower tube of the coiled tubing. The rotary sealer provides high-pressure injection agent in the continuous oil pipe and simultaneously ensures complete sealing, and ensures that the upper pipe and the lower pipe are synchronously operated with the injection agent.
Furthermore, the coiled tubing adopts a special TIC-80 coiled tubing for petroleum, the length is 2200-3200 meters, the outer diameter is 16-25mm, the inner diameter is 13-22mm, the working pressure is 80-100Mpa, the discharge capacity is 80L/min, the tensile strength is 4T, the maximum operation depth is 3000 meters, and the coiled tubing is suitable for the exploitation of a thick oil layer with the maximum depth of 3000 meters. The small-caliber CT-80 small-caliber coiled tubing can be welded for use, resists severe environment operation and is resistant to stretching. The outer diameter of the well bore applied by the invention is 139.7mm-244.5mm. The caliber and the working pressure of the coiled tubing are suitable for continuously conveying viscosity-reducing agents underground, pressurizing and continuously descending, continuous operation of the rotary nozzle 9 is guaranteed, and the coiled tubing is fast to feed and discharge under the condition of meeting the operating pressure, labor-saving, energy-saving and cost-reducing.
Further, the coiled tubing high-pressure water jet injection thick oil viscosity reduction device further comprises: and the pipe arranger is arranged on the continuous oil pipe vehicle and is connected with the continuous oil pipe. The pipe arranging device can quickly arrange pipes up and down and can neatly arrange 3200-meter pipes in order so as to improve the operation speed. Be equipped with hydraulic winch on the coiled tubing car, full-automatic upper and lower pipe, upper and lower pipe adopt hydraulic reducer to prevent the coaster, the speed of lower pipe: 60 m/min, tube lifting speed: 80 m/min, high working efficiency.
Further, the wellhead assembly 6 includes: and the hydraulic seal box is used for sealing the continuous oil pipe. The wellhead device adopts a double-ram blowout preventer and is also provided with a hydraulic sealing box of a hollow continuous pipe to ensure possible well kick and blowout control of the operation, the system does not need an injection head to cooperate with a pipe conveying, and only needs the fixed pulley 5 and the support thereof to simply operate, thereby greatly reducing the complexity of the operation of the injection head and the operation cost.
Furthermore, the viscosity reduction agent storage device 1 is a agent vehicle, so that the viscosity reduction agent is convenient to convey and store, and the agent vehicle can be further provided with an insulation box for insulating the viscosity reduction agent, so that the viscosity reduction agent is uniformly mixed with the thickened oil at 35-55 ℃ underground. Because the underground is hot and the underground is hot as the underground goes to the deep part of the stratum, and because the operation time is short, the temperature cannot be rapidly reduced, the viscosity-reducing agent is conveyed from the ground to the underground through a coiled tubing for a long distance (more than 2000 meters), and the temperature requirement of 35-55 ℃ in the underground can be met by adopting normal temperature or only adopting the heat preservation of an insulation box on the ground, so the traditional mode of carrying out electric heating on the ground is not needed, and the electric energy is saved.
As shown in fig. 2, the invention also provides a viscosity reduction method for thickened oil by high-pressure water jet injection of a coiled tubing, which adopts the viscosity reduction device for thickened oil by high-pressure water jet injection of a coiled tubing shown in fig. 1, and the viscosity reduction method for conveying the high-pressure water jet injection of the coiled tubing comprises the following steps:
step A, connecting a rotary spray head 9 to the tail end of a continuous oil pipe 40, and putting the rotary spray head 9 and the continuous oil pipe 40 into the underground;
step B, after the rotary sprayer 9 reaches a thick oil interface in the well, namely enters a thick oil layer 80, the viscosity-reducing agent is conveyed to the continuous oil pipe 40 and the rotary sprayer 9 on the ground through the pumping of the circulating pump 2 and the pressurization of the pressurization pump 3;
and step C, the rotary sprayer 9 sprays the pressurized viscosity-reducing agent, the continuous oil pipe 40 continuously descends while the rotary sprayer 9 sprays, so that the continuous oil pipe 40 drives the rotary sprayer 9 to continuously descend, the continuous drilling of the rotary sprayer 9 is realized, the rotation process of the rotary sprayer realizes simultaneous completion of injection, stirring and drilling, injection by jet flow, high-speed stirring and local cavitation are realized, and the viscosity of thick oil in a shaft is quickly reduced to thin oil while the sprayer continuously drills.
Specifically, as shown in fig. 2, the operation process of the present invention is:
the viscosity reducing agent, namely (low-temperature) agent, is sent to a pressure pump (high-pressure pump) for pressurization through a circulating pump on the ground, is connected to a continuous oil pipe of a hydraulic winch through a rotary sealer through the pressure flow control of the viscosity reducing agent, the continuous oil pipe passes through a wellhead device (including a wellhead blowout preventer) through a fixed pulley and is put into the well, a rotary spray head at the tail end of the continuous oil pipe rotates to jet the viscosity reducing agent, the viscosity reducing agent is stirred at a high speed and locally forms cavitation, thick oil in a shaft is quickly reduced to thin oil, meanwhile, the spray head and the continuous oil pipe continuously drill and penetrate through an oil layer, then the pipe is lifted, and the continuous oil pipe is lifted through speed reduction control and automatic pipe discharge to complete the operation.
Further, through full-automatic top tube and the low tube that realizes coiled tubing of hydraulic winch, top tube and low tube adopt hydraulic reducer to prevent the coaster, the biggest low tube speed: 60 m/min, maximum top tube speed: 80 m/min. The invention skillfully utilizes the physical characteristics of high pressure and jet flow during operation, and in the process of continuously lowering the pipe, the dead weight (about 2 tons) of the continuous oil pipe can generate gravity acceleration except that the rotating nozzle 9 with strong recoil under high pressure pushes the spray head to drill. The dead weight of the continuous oil pipe and the pipe descending speed of dozens of meters per minute (the maximum pipe descending speed: 60 meters per minute) can generate larger impact force, so that the friction resistance of the rotary spray head and the pipe wall of the continuous oil pipe is greatly reduced, the continuous oil pipe can easily penetrate through a deep oil layer or a thick oil layer 80, particularly, under the condition that the oil layer is deeper and deeper, the continuous oil pipe with the rotary spray head is not blocked along with the increase of the depth, and the pipe descending becomes very easy.
The ultrasonic cavitation of the rotary spray head can instantly dissociate water into an ionic state, and the high-pressure jet pressure enables water/agent/oil to be quickly mixed and rubbed in a casing pipe confined space due to the small space of a thick oil layer 80 in a shaft under a high-pressure and ultra-normal state of an active agent in the viscosity reducer, so that the binding state among the molecules of the thick oil is quickly broken. Compared with the normal viscosity reduction efficiency of the agent injection, the movement efficiency is improved by 300 percent, the thick oil is in a fine foam state in a physical state, the fluidity is excellent, and the viscosity reduction particles of the crude oil are fine and uniform, which cannot be realized by other technologies.
Furthermore, the viscosity reducing agent is subjected to temperature control on the ground, for example, heat preservation is carried out, so that the viscosity reducing agent is uniformly mixed with the thick oil at 35-55 ℃ underground, and the cost is lower than that of the common chemical injection agent and electric heating.
Furthermore, the rotary sprayer is provided with two front nozzles and six rear nozzles, the two front nozzles rotate to shear and open a channel, the six rear nozzles generate rear ejection force, the whole system can be completely sealed under the high-pressure condition by adopting a high-pressure rotary sealing technology, a strong magnetic speed limiting technology and a gem nozzle anti-scouring technology, and the rotating speed of the rotary sprayer is 1500-3000r/min, so that the rotary sprayer overcomes the huge pressure generated by a thick oil layer, can play the roles of rotary stirring and high-pressure local cavitation and has strong self-drilling capability; the rotary spray head (for washing the well at the perforation section) has the function of directly spraying and cleaning the blast hole, and the deep cleaning and the permeability improvement are very effective. Such a rotary sprayer is a high-speed rotary sprayer and is commercially available.
According to the viscous crude oil analysis method, crude oil can be analyzed before operation by utilizing a calculation formula of water conservancy dynamics according to viscosity and component analysis of viscous crude oil, operation parameters such as size, depth, nozzle diameter, pressure value, discharge value and friction resistance of the continuous oil pipe are calculated, and the optimal operation parameters are selected according to viscous crude oil characteristics of different blocks. Besides being suitable for thick oil wells, the method is also suitable for low-yield wells/accident wells needing chemical agent treatment.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. In order that the components of the present invention may be combined without conflict, it is intended that all equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present invention shall fall within the protection scope of the present invention.
Claims (3)
1. The viscosity reduction method for the heavy oil by injecting the agent by the high-pressure water jet of the continuous oil pipe is characterized by adopting a viscosity reduction device for the heavy oil by injecting the agent by the high-pressure water jet of the continuous oil pipe, and comprises the following steps:
a, connecting a rotary spray head to the tail end of a continuous oil pipe, and putting the rotary spray head and the continuous oil pipe into a well; through full-automatic realization coiled tubing's of hydraulic winch top tube and low tube, top tube and low tube adopt hydraulic reducer to prevent the coaster, and low tube speed reaches at most: 60 m/min, top tube speed up to a maximum: 80 m/min; the self weight of the coiled tubing is 2 tons, the gravity acceleration can be generated, the self weight of the coiled tubing and the pipe descending speed of tens of meters per minute can generate larger impulsive force, so that the friction resistance of the rotary spray head and the pipe wall of the coiled tubing is greatly reduced, and the coiled tubing can easily penetrate through a deep oil layer or a thick oil layer;
step B, after the rotary nozzle reaches a thick oil interface in the well, the viscosity-reducing agent is conveyed to the continuous oil pipe and the rotary nozzle on the ground through pumping and pressurization;
step C, the rotary sprayer sprays the pressurized viscosity-reducing agent, and the continuous oil pipe continuously enters the rotary sprayer while spraying; the ultrasonic cavitation of the rotary nozzle instantly dissociates water into an ionic state;
the high-pressure water jet agent injection thick oil viscosity reduction device for the continuous oil pipe comprises:
the viscosity-reducing agent storage device is arranged on the ground;
the circulating pump is arranged on the ground and connected with the viscosity-reducing agent storage device;
the pressure pump is connected with the circulating pump;
the coiled tubing truck is arranged on the ground, a coiled tubing is arranged on the coiled tubing truck, and the coiled tubing is connected with the pressure pump;
the well head device is arranged on the well head, and the coiled tubing penetrates through the well head device and extends into the well head;
the rotary spray head is arranged in the wellhead and positioned below the wellhead device, and the rotary spray head is connected to the tail end of the continuous oil pipe;
the high-pressure water jet of coiled tubing annotates agent viscous crude viscosity reduction device still includes: and the oil tank truck or the oil fishing truck connected to the wellhead device collects the diluted thin oil from the underground to the ground and transports the diluted thin oil away.
2. The method for reducing viscosity of heavy oil by injecting agent through coiled tubing high-pressure water jet according to claim 1, wherein the temperature of the viscosity reducing agent is controlled on the ground, so that the viscosity reducing agent is uniformly mixed with the heavy oil at 35-55 ℃ underground.
3. The viscosity reduction method for heavy oil by coiled tubing high-pressure water jet injection according to claim 1, wherein the rotary nozzle has two front nozzles and six rear nozzles, the two front nozzles rotate to shear open a channel, the six rear nozzles generate rear injection force, and the rotating speed of the rotary nozzle is 1500-3000r/min.
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| CN108915655B (en) * | 2018-08-06 | 2020-06-30 | 中国石油化工股份有限公司 | Energy storage rotary heating exploitation device for oil bailing well |
| CN109057752B (en) * | 2018-08-07 | 2020-10-16 | 黑龙江兰德超声科技股份有限公司 | Ultrasonic wave wax-proof viscosity-reducing equipment for oil well head |
| CN108999593B (en) * | 2018-10-08 | 2021-08-13 | 大庆荣氏采油技术开发有限公司 | Oil well pipe sleeve scale cleaning method |
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| US5291956A (en) * | 1992-04-15 | 1994-03-08 | Union Oil Company Of California | Coiled tubing drilling apparatus and method |
| CN202140068U (en) * | 2011-07-18 | 2012-02-08 | 东营滨龙机电有限公司 | Well head automatic drug feeding device |
| CN102777138A (en) * | 2011-11-14 | 2012-11-14 | 中国石油大学(北京) | Method combining coiled tubing with supercritical CO2 for jet-flow sand washing plugging removal |
| CN105569619A (en) * | 2015-12-10 | 2016-05-11 | 中国石油天然气集团公司 | Abrasive perforating unblocking method and device for coiled tubing |
| CN206220937U (en) * | 2016-12-05 | 2017-06-06 | 泰尔达能源科技（北京）有限公司 | Coiled tubing high-pressure water jet injecting reducing thick oil viscosity device |
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2016
- 2016-12-05 CN CN201611101127.8A patent/CN106639997B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5291956A (en) * | 1992-04-15 | 1994-03-08 | Union Oil Company Of California | Coiled tubing drilling apparatus and method |
| CN202140068U (en) * | 2011-07-18 | 2012-02-08 | 东营滨龙机电有限公司 | Well head automatic drug feeding device |
| CN102777138A (en) * | 2011-11-14 | 2012-11-14 | 中国石油大学(北京) | Method combining coiled tubing with supercritical CO2 for jet-flow sand washing plugging removal |
| CN105569619A (en) * | 2015-12-10 | 2016-05-11 | 中国石油天然气集团公司 | Abrasive perforating unblocking method and device for coiled tubing |
| CN206220937U (en) * | 2016-12-05 | 2017-06-06 | 泰尔达能源科技（北京）有限公司 | Coiled tubing high-pressure water jet injecting reducing thick oil viscosity device |
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| CN106639997A (en) | 2017-05-10 |
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