CN114562231A

CN114562231A - Wellbore descaling method, system, device and computer storage medium

Info

Publication number: CN114562231A
Application number: CN202011360179.3A
Authority: CN
Inventors: 刘辉; 陈京元; 张华礼; 杨建�; 杨航; 艾志鹏; 王斌; 李国�; 王宇; 严俊涛; 黄晶; 钱思虹
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2022-05-31
Anticipated expiration: 2040-11-27
Also published as: CN114562231B

Abstract

The embodiment of the application discloses a shaft descaling method, a shaft descaling system, a shaft descaling device and a computer storage medium, and belongs to the technical field of oil and gas well maintenance. The method comprises the following steps: and injecting mixed liquor comprising saturated solution and solute particles into the shaft through the descaling pipe to remove dirt in the shaft, stopping injecting the mixed liquor, injecting solvent in the mixed liquor into the shaft, and discharging the removed dirt and solute. The embodiment of the application clears away the dirt in the pit shaft through saturated solution and the solute particle that utilize in the mixed liquid to utilize the solvent to discharge dirt and the solute of clearing away, not only can be with the effectual clearance of dirt in the pit shaft, still avoided appearing the phenomenon of jam in the pit shaft.

Description

Wellbore descaling method, system, device and computer storage medium

Technical Field

The embodiment of the application relates to the technical field of oil and gas well maintenance, in particular to a shaft descaling method, a shaft descaling system, a shaft descaling device and a computer storage medium.

Background

The shaft is a channel for communicating the ground with the oil and gas reservoir and is a necessary channel for oil and gas production. Because the shaft is in the underground for a long time, the inner wall of the shaft made of metal is rusted. In addition, because wellbores have long been used to transport hydrocarbons, some downhole contaminants stick to the inside walls of the wellbore. Therefore, dirt on the inner wall of the shaft needs to be removed in time.

In the related art, abrasive particles such as quartz sand or garnet are mixed into pure water, the pure water mixed with the abrasive particles is injected into a wellbore through a coiled pipe at a constant discharge rate, and the wellbore is descaled by an impact force of a jet flow generated by the pure water mixed with the abrasive particles. Through the mode of mixing the pure water and the abrasive particles in a solid-liquid mode, the destructive capacity of jet impact can be enhanced, and therefore dirt on the inner wall of the shaft can be effectively removed.

In the above-described technique, since the abrasive particles have a high hardness, the inner wall of the wellbore is easily damaged. In addition, abrasive particles are easily accumulated in a shaft to cause shaft blockage, and further influence oil and gas production.

Disclosure of Invention

The embodiment of the application provides a method, a system and a device for removing scale in a shaft and a computer storage medium, which can avoid the phenomenon of blockage in the shaft. The technical scheme is as follows:

in a first aspect, there is provided a wellbore descaling method, the method comprising:

controlling mixed liquor to be injected into a shaft through a descaling pipe so as to remove dirt in the shaft through the mixed liquor, wherein the mixed liquor comprises saturated solution and solute particles, and the saturated solution is obtained after the solute particles are dissolved in a solvent;

after stopping injecting the mixed liquor into the well bore, controlling the solvent to be injected into the well bore through a descaling pipe, so that the cleaned dirt and the undissolved solute in the mixed liquor are discharged out of the well bore through the solvent.

Optionally, the method comprises:

controlling a continuous pipe connected with the descaling pipe to be placed in the shaft at a constant speed;

and in the process of lowering the continuous pipe at a constant speed, executing the step of controlling the mixed liquid to be injected into the shaft through the descaling pipe.

Optionally, the method further comprises:

stopping injecting the mixed liquor into the well bore when the lowering depth of the continuous pipe is determined to exceed the reference depth.

Optionally, the uniform-speed lowering speed is 1-2 m/min.

Optionally, the solute particles are salt particles, the solvent is clear water, and the saturated solution is saturated saline.

Optionally, the displacement of the mixed liquor injected into the wellbore is a reference displacement;

the reference displacement is related to one or more of a depth of the scale in the wellbore, a thickness, and a maximum displacement allowed by a coiled tubing connected to the scale removal pipe.

In a second aspect, a wellbore descaling system is provided, the system comprising a booster pump, an abrasive feed pump, a saturated solution tank, a mixing tank, and a solvent tank;

the pressure pump is respectively connected with the saturated solution tank and the mixing tank, the grinding material supply pump is also connected with the mixing tank, and the pressure pump is also connected with the solvent tank;

the pressurizing pump is used for injecting saturated solution in the saturated solution tank into the mixing tank, the grinding material supply pump is used for injecting solute particles into the mixing tank, the mixing tank is used for storing mixed solution, the mixed solution comprises the saturated solution and the solute particles, and the saturated solution is obtained after the solute particles are dissolved in a solvent;

the booster pump is also used for injecting the mixed liquid in the mixing tank into a shaft through a descaling pipe;

the booster pump is also used for injecting the solvent in the solvent tank into a wellbore through a descaling pipe.

Optionally, the system further comprises a coiled tubing;

one end of the continuous pipe is respectively connected with the mixing tank and the solvent tank;

the other end of the continuous pipe is connected with the descaling pipe.

In a third aspect, there is provided a wellbore descaling device, the device comprising:

the control module is used for controlling mixed liquor to be injected into a shaft through a descaling pipe so as to remove dirt in the shaft through the mixed liquor, the mixed liquor comprises saturated solution and solute particles, and the saturated solution is obtained after the solute particles are dissolved in a solvent;

the control module is further used for controlling the solvent to be injected into the shaft through the descaling pipe after the mixed liquid is stopped being injected into the shaft, so that the cleaned dirt and the undissolved solute in the mixed liquid are discharged out of the shaft through the solvent.

In a fourth aspect, a computer readable storage medium having instructions stored thereon, the instructions when executed by a processor, implement a wellbore descaling method according to the first aspect above.

In a fifth aspect, there is provided a computer apparatus, the apparatus comprising:

a processor;

a memory for storing processor-executable instructions;

wherein the processor is configured to perform a wellbore descaling method according to the first aspect.

In a sixth aspect, there is provided a computer program product containing instructions which, when run on a computer, cause the computer to perform the wellbore descaling method of the first aspect described above.

The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:

cleaning the wellbore by injecting a mixed liquor comprising a saturated solution and solute particles into the wellbore, and then injecting a solvent into the wellbore to displace the wellbore contents. The impact destructive capacity of the jet flow is enhanced by using the saturated solution and the solute particles, and dirt is effectively removed. In addition, because the saturated solution is obtained after the solute particles are dissolved in the solvent, the injected solvent can dissolve the solute particles and discharge the dirt removed by the solvent and the undissolved solute in the mixed solution out of the shaft, so that the phenomenon that the shaft is blocked by the solute is avoided.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a wellbore descaling system according to an embodiment of the present application.

FIG. 2 is a flow chart of a wellbore descaling method according to an embodiment of the present application.

FIG. 3 is a schematic diagram of a descaling pipe structure according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of a descaling spray head according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a front view of a fan nozzle provided in an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a top view of a fan nozzle provided in an embodiment of the present application.

Fig. 7 is a schematic left-side view of a fan nozzle according to an embodiment of the present disclosure.

Fig. 8 is a schematic structural diagram of a wellbore descaling device according to an embodiment of the present application.

Fig. 9 is a block diagram of a terminal 900 according to an embodiment of the present disclosure.

Fig. 10 is a schematic diagram of a server structure provided in this embodiment.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present application more clear, the embodiments of the present application will be further described in detail with reference to the accompanying drawings.

For convenience of description, an application scenario of the embodiment of the present application is described first.

The well bore is the necessary passage for producing oil and gas. Because the wellbore is in the ground for a long period of time and transports hydrocarbons for a long period of time, fouling can occur on the inner walls of the wellbore. If the dirt is not removed in time, more and more dirt can be accumulated on the inner wall of the shaft, and the oil gas production can be further influenced.

The method provided by the embodiment of the application is applied to the scene of descaling the inner wall of the shaft.

In order to realize a wellbore descaling method, the embodiment of the application provides a wellbore descaling system. For the convenience of the following description, the wellbore descaling system will be explained in detail.

Fig. 1 is a schematic structural diagram of a wellbore descaling system according to an embodiment of the present application. As shown in fig. 1, the wellbore descaling system 100 includes a booster pump 101, an abrasive feed pump 102, a saturated solution tank 103, a mixing tank 104, a solvent tank 105, and a descaling pipe 106.

In the shaft descaling system, a pressure pump is respectively connected with a saturated solution tank and a mixing tank, an abrasive feeding pump is also connected with the mixing tank, and the pressure pump is also connected with a solvent tank.

Wherein, the booster pump is used for injecting the saturated solution in the saturated solution tank into the mixing tank. An abrasive feed pump is used to inject solute particles into the mixing tank. The mixing tank is used for storing mixed liquid, the mixed liquid comprises saturated solution and solute particles, and the saturated solution is obtained after the solute particles are dissolved in the solvent. The saturated solution tank is used for storing the saturated solution. The solvent tank is used for storing the solvent for dissolving the solute particles. In addition, the booster pump is also used for injecting the mixed liquid in the mixing tank into the shaft through the descaling pipe and injecting the solvent in the solvent tank into the shaft through the descaling pipe.

In one possible implementation, when the solute particles are salt particles, the abrasive supply pump may be referred to as a salt particle pump. When the solvent is clean water, the solvent tank may be referred to as a clean water tank. When the saturated solution is saturated brine, the saturated solution tank may be referred to as a saturated brine tank.

Further, optionally, as shown in fig. 1, the wellbore descaling system further comprises a continuous pipe 107, one end of which is connected with the mixing tank and the solvent tank, respectively, and the other end of which is connected with the descaling pipe. Wherein the coiled tubing is used to move the descaling cells within the wellbore. The descaling pipe is used for injecting substances into a shaft.

Based on the wellbore descaling system shown in fig. 1, the method provided by the embodiment of the present application is further described below by taking fig. 2 as an example. It should be noted that, in the embodiment of the present application, the terminal, the controller, the server, and the like may be used to execute the steps in fig. 2, and an execution subject of the embodiment of the present application is not limited herein. Fig. 2 illustrates a terminal as an execution subject.

Fig. 2 is a flow chart of a wellbore descaling method provided by an embodiment of the present application, which may include the following steps.

Step 201: and controlling mixed liquid to be injected into the shaft through the descaling pipe by the terminal so as to remove dirt in the shaft through the mixed liquid.

Based on the system shown in fig. 1, in one possible implementation, the terminal controls the booster pump to inject the saturated solution in the saturated solution tank into the mixing tank, and the mixed liquid in the mixing tank is injected into the well bore through the descaling pipe, so that the dirt in the well bore is removed through the mixed liquid.

The displacement of mixed liquid injected into the shaft through the descaling pipe by the booster pump is a reference displacement, wherein the reference displacement is related to one or more of the depth and the thickness of dirt in the shaft and the maximum displacement allowed by a continuous pipe connected with the descaling pipe.

The depth and thickness of the dirt in the wellbore are measured by a drift tool. For example, if a wellbore has a depth of 1000 meters from surface to dirt and a thickness of 0.5 meters as measured by a drift tool, the calculated displacement may require 700L/min (minutes per liter), but since the continuous pipe connected to the descaling pipe allows a maximum displacement of 400 to 600L/min, the reference displacement is 400 to 600L/min for the wellbore.

The above-described drifting tool is a tool capable of measuring data associated within a wellbore. The drifting tool may be a rod that can be extended into the well bore, a mechanical electronic device, or a retractable sonde, etc., which are not illustrated herein.

The related data in the well bore comprise the depth of the well bore, the depth of dirt in the well bore, the thickness of dirt in the well bore, the type of dirt in the well bore and the like.

The mixed liquid in step 201 above removes the dirt in the wellbore in the following manner: because the mixed solution comprises the saturated solution and the solute particles, the dirt in the shaft is removed by utilizing the mutual flowability of the saturated solution and the solute particles in the mixed solution and the jet impact force of the mixed solution.

In a possible implementation manner, when the solvent is clean water, the saturated solution is saturated saline water, and the solute is salt particles in the step 201, the salt particles have hardness smaller than that of quartz sand or garnet, so that the damage to the inner wall of the well bore is small. And the salt particles and saturated brine are convenient to obtain and low in price, and have good economic benefits and application values.

In order to remove all the dirt in the wellbore, in one possible implementation, the terminal controls the continuous pipe to which the descaling pipe is connected to be lowered at a constant speed in the wellbore. And in the process of lowering the continuous pipe at a constant speed, executing the step of controlling the mixed liquid to be injected into the shaft through the descaling pipe. The scale removal pipe is placed in the shaft, mixed liquor is injected into the shaft for scale removal, and when the scale removal pipe reaches the position where the scale removal in the shaft is finished from the position where the scale removal in the shaft is started, the mixed liquor removes all the scale in the shaft.

In a possible implementation mode, the uniform-speed lowering speed is 1-2 m/min, and the lowering speed can be used for clearing away dirt in the shaft more comprehensively without wasting resources.

Furthermore, in order to remove all the fouling from the wellbore, in another possible implementation, the terminal controls the coiled tubing connected to the descaling tubes to be lowered in the wellbore, and during the period below the coiled tubing, the step of controlling the injection of mixed liquor through the descaling tubes into the wellbore is not performed. And when the continuous pipe stops descending, executing the step of controlling the mixed liquid to be injected into the shaft through the descaling pipe. And after the continuous pipe is placed for many times, the mixed liquid removes all dirt in the shaft from the position where the dirt in the shaft begins to the position where the dirt in the shaft ends.

The above-mentioned multiple lowering may be to lower the coiled tubing once every 1 to 2 minutes, and the lowered position is the position in the wellbore where the dirt needs to be removed next, and is close to the position where the dirt is removed, and is generally about 1 meter.

In addition, the position where the mixed liquor is injected into the shaft through the descaling pipe at the terminal is the position of the upper end of the position where the dirt in the shaft begins, and the step of controlling the mixed liquor to be injected into the shaft through the descaling pipe is executed from the upper end of the position where the dirt begins, so that all the dirt can be more effectively removed.

The upper end of the point where fouling begins may be 1 to 2 meters above the point where fouling begins in the wellbore, i.e., where the injection of mixed liquor begins 1 to 2 meters above the point where fouling begins in the wellbore in the descaling pipe.

In one possible implementation, the descaling pipe comprises a conversion joint, a rotational flow centralizer short section and a descaling spray head. Fig. 3 is a schematic view of a descaling pipe structure according to the embodiment of the present application, as shown in fig. 3. In fig. 3, the external thread at the lower end of the coiled tubing 1 is connected with the internal thread at the upper end of the adapter 2, the external thread at the lower end of the adapter 2 is connected with the internal thread at the upper end of the rotational flow centralizer short section 3, and the external thread at the lower end of the rotational flow centralizer short section 3 is connected with the internal thread at the upper end of the descaling spray nozzle 4. Wherein, whirl centralizer nipple joint both ends symmetry design whirl rightting piece, have rightting and whirl dual function. The centralizing indication will ensure that the descaling pipe is placed in the center of the shaft during the working process of the descaling pipe. The swirling flow indicates the mutual mobility between the saturated solution and the solute species in the mixed liquor.

The threads of the adapter, the swirl centralizer sub, and the descaling spray head are PAC (pacific asian connection) button type, AMMT (American mining macaroni tube) button type, tubing button type, REG (API regular thread) button type, and the like, and the thread opening types of the adapter, the swirl centralizer sub, and the descaling spray head are not limited herein.

In addition, the descaling spray head comprises 8 spray holes, 4 spray holes are uniformly distributed on one vertical section of the descaling spray head, and the other 4 spray holes are uniformly distributed on the other vertical section which is perpendicular to the vertical section. As shown in fig. 4, fig. 4 is a schematic structural diagram of a descaling spray head according to an embodiment of the present application. In fig. 4, 4 spray holes 5 are shown, which are uniformly distributed on a vertical section of the descaling spray head, and each spray hole is spaced 45 degrees from the adjacent spray hole, and the central axes of the spray holes uniformly distributed on all the vertical sections and the spray holes uniformly distributed on the other vertical section perpendicular to the vertical section form an included angle of 45 degrees with the central axis of the spray head. The descaling spray head also comprises a fan-shaped nozzle, wherein the spray hole of the descaling spray head is matched with the fan-shaped nozzle. In fig. 4, the front end of the fan-shaped nozzle 5 is in a shape of a long and narrow blade, the external thread at the rear end is in threaded connection with the inner spraying hole, and 8 liquid sectors formed by spraying from the descaling spray head 4 through the fan-shaped nozzle 5 can cover the whole inner wall of the shaft.

Specifically, as shown in fig. 5, fig. 5 is a schematic structural diagram of a front view of a fan-shaped nozzle provided in an embodiment of the present application. As shown in fig. 6, fig. 6 is a schematic structural diagram of a top view of a fan nozzle provided in an embodiment of the present application. As shown in fig. 7, fig. 7 is a schematic structural diagram of a left side view of a fan-shaped nozzle provided in an embodiment of the present application.

The descaling pipe with the structure has the advantages of simple structure, convenient assembly and reliable performance, and can more efficiently remove dirt in a shaft.

Step 202: after stopping injecting the mixed liquor into the well bore, the terminal controls the solvent to be injected into the well bore through the descaling pipe, so that the removed dirt and the undissolved solute in the mixed liquor are discharged out of the well bore through the solvent.

Based on the system shown in fig. 1, in one possible implementation, the terminal stops injecting mixed liquor into the wellbore upon determining that the lowering depth of the coiled tubing exceeds a reference depth. After stopping injecting the mixed liquid into the well bore, the terminal controls the pressure pump to inject the solvent in the solvent tank into the well bore through the descaling pipe, so that the removed dirt and the undissolved solute in the mixed liquid are discharged out of the well bore through the solvent.

The reference depth is a depth at which mixed liquor removes dirt in the wellbore, and in one possible implementation, the reference depth is a plurality of reference depths, a difference exists between every two adjacent reference depths, and the first reference depth is a depth at which the descaling pipe starts to inject mixed liquor plus a difference between every two adjacent reference depths. And the maximum reference depth is greater than or equal to the depth from the surface to the point in the wellbore where the fouling ends. Optionally, the difference between every two adjacent reference depths is equal, and the descaling pipe stops injecting the mixed liquor into the well bore when reaching one reference depth until reaching the maximum reference depth, and the descaling pipe does not continue to descend.

For example, there is a difference of 100 meters between every two adjacent reference depth values. Where the scale in the wellbore begins 20 meters from the surface, where the scale removal pipe is 2 meters above where the scale in the wellbore begins, and where the first reference depth is 122 meters, where the scale removal pipe reaches 122 meters, the injection of mixed liquor into the wellbore is stopped. And then continuously lowering the continuous pipe connected with the descaling pipe, stopping injecting the mixed liquid into the shaft when the descaling pipe reaches a second reference depth, wherein the second reference depth is 222, and so on until the descaling pipe reaches the maximum reference depth, and the descaling pipe does not continuously move downwards. If the depth value of the foulant within the wellbore from the surface to where the foulant ended is 1000, the maximum reference depth is the sixth reference depth, and the sixth reference depth is 1022 meters.

Optionally, the difference between every two adjacent depth values is not equal. And stopping injecting the mixed liquor into the shaft when the descaling pipe reaches a reference depth until the descaling pipe reaches the maximum reference depth and the descaling pipe does not continue to descend.

In another possible implementation, the reference depth is a reference depth, and the depth is the depth from the surface to where the fouling ends in the wellbore. And at the moment, when the terminal detects that the mixed liquor clears all the dirt in the shaft, the descaling pipe is controlled to stop injecting the mixed liquor into the shaft.

In order to more thoroughly remove the dirt in the well bore, the well bore needs to be cleaned after removing the dirt in the well bore. And the terminal control solvent is injected into the shaft through the descaling pipe, the shaft is cleaned by the solvent, and the solvent can dissolve solute particles in the mixed solution, so that the cleaned dirt and undissolved solute in the mixed solution can be discharged out of the shaft by the solvent.

Based on the system shown in fig. 1, in one possible implementation manner, the above-mentioned implementation manner of using the solvent to discharge the removed dirt and the undissolved solute in the mixed liquid out of the wellbore is as follows: the booster pump is used to bring material in the wellbore out of the wellbore through the descaling tubes. Thus, the booster pump uses negative pressure to carry the removed scale and undissolved solute of the mixed liquor out of the wellbore through the descaling tubes.

Based on the two implementation manners of the reference depth, the corresponding implementation manners of injecting the terminal control solvent into the shaft through the descaling pipe are also divided into two.

First, when the reference depth is multiple reference depths, after stopping injecting the mixed liquid into the shaft every time when the reference depth reaches one reference depth, the terminal controls the solvent to be injected into the shaft through the descaling pipe.

And when the descaling pipe reaches each reference depth, after the removed dirt and the undissolved solute in the mixed liquor are discharged out of the shaft through the solvent, the mixed liquor is injected into the shaft in the downward process of the descaling pipe. Namely, the effect of thoroughly removing dirt in the shaft is achieved by a circulating mode of injecting mixed liquid into the shaft by the descaling pipe and injecting solvent into the shaft by the descaling pipe.

For example, based on the above example, after the descaling pipe stops injecting the mixed liquid into the well bore at the first reference depth of 122 meters, the descaling pipe injects the solvent into the well bore. As the scale removal pipe continues down, the scale removal pipe injects a solvent into the wellbore after the scale removal pipe stops injecting mixed liquor into the wellbore at the first reference depth of 222 meters. And the rest is repeated until the descaling pipe reaches the maximum reference depth of 1022 meters, and the descaling pipe injects the solvent into the shaft for the last time.

And secondly, when the reference depth is one reference depth, when the descaling pipe reaches the reference depth, stopping injecting the mixed liquid into the shaft, and controlling the solvent to be injected into the shaft through the descaling pipe by the terminal.

When the descaling pipe reaches only one reference depth, namely when all the dirt in the well bore is completely removed, the removed dirt and the undissolved solute in the mixed liquid are discharged out of the well bore through the solvent. Therefore, the time for removing the dirt in the shaft is shortened, and the efficiency for removing the dirt in the shaft is improved.

In summary, in the embodiments of the present application, wellbore fouling is removed by injecting a mixed solution comprising a saturated solution and solute particles into the wellbore, and then injecting a solvent into the wellbore to remove the wellbore contents. The impact destructive capacity of the jet flow is enhanced by using the saturated solution and the solute particles, and dirt is effectively removed. In addition, because the saturated solution is obtained after the solute particles are dissolved in the solvent, the injected solvent can dissolve the solute particles and discharge the dirt removed by the solvent and the undissolved solute in the mixed solution out of the shaft, so that the phenomenon that the shaft is blocked by the solute is avoided.

All the above optional technical solutions can be combined arbitrarily to form an optional embodiment of the present application, and the present application embodiment is not described in detail again.

Fig. 8 is a schematic structural diagram of a wellbore descaling device provided by the embodiments of the present application, and the wellbore descaling device can be implemented by software, hardware or a combination of the two. As shown in fig. 8, the wellbore descaling apparatus 800 includes: and a control module 801.

The control module is used for controlling mixed liquor to be injected into the shaft through the descaling pipe so as to remove dirt in the shaft through the mixed liquor, the mixed liquor comprises saturated solution and solute particles, and the saturated solution is obtained after the solute particles are dissolved in a solvent. The specific implementation manner can refer to step 201 in fig. 2.

And the control module is also used for controlling the solvent to be injected into the shaft through the descaling pipe after the mixed liquid is stopped being injected into the shaft, so that the removed dirt and the undissolved solute in the mixed liquid are discharged out of the shaft through the solvent. The detailed implementation can refer to step 202 in fig. 2.

Optionally, the apparatus comprises:

controlling the continuous pipe connected with the descaling pipe to be placed in the shaft at a constant speed;

Optionally, the apparatus further comprises:

and stopping injecting the mixed liquor into the well bore when the lowering depth of the continuous pipe is determined to exceed the reference depth.

Optionally, the speed of the uniform-speed lowering is 1-2 m/min.

Alternatively, the solute particles are salt particles, the solvent is clear water, and the saturated solution is saturated saline.

Optionally, the displacement of mixed liquor injected into the wellbore is a reference displacement;

the reference displacement is related to one or more of a depth of the foulant within the wellbore, a thickness, and a maximum displacement allowed by a coiled tubing connected to the scale removal tubing.

In summary, in the embodiments of the present application, the wellbore is cleaned of scale by injecting a mixture solution comprising a saturated solution and solute particles into the wellbore, and then removing the wellbore contents by injecting a solvent into the wellbore. The impact destructive capacity of the jet flow is enhanced by using the saturated solution and the solute particles, and dirt is effectively removed. In addition, because the saturated solution is obtained after the solute particles are dissolved in the solvent, the injected solvent can dissolve the solute particles and discharge the dirt removed by the solvent and the undissolved solute in the mixed solution out of the shaft, so that the phenomenon that the shaft is blocked by the solute is avoided.

It should be noted that: when the wellbore descaling device provided by the above embodiment performs wellbore descaling, only the division of the above function modules is used for illustration, in practical application, the function distribution may be completed by different function modules according to needs, that is, the internal structure of the device is divided into different function modules, so as to complete all or part of the functions described above. In addition, the wellbore descaling device provided by the embodiment and the wellbore descaling method provided by the embodiment belong to the same concept, and the specific implementation process is detailed in the method embodiment and is not described again.

Fig. 9 is a block diagram of a terminal 900 according to an embodiment of the present disclosure. The terminal 900 may be: a smart phone, a tablet computer, an MP3 player (Moving Picture Experts Group Audio Layer III, motion video Experts compression standard Audio Layer 3), an MP4 player (Moving Picture Experts Group Audio Layer IV, motion video Experts compression standard Audio Layer 4), a notebook computer, or a desktop computer. Terminal 900 may also be referred to by other names such as user equipment, portable terminals, laptop terminals, desktop terminals, and the like.

In general, terminal 900 includes: a processor 901 and a memory 902.

Processor 901 may include one or more processing cores, such as a 4-core processor, an 8-core processor, and so on. The processor 901 may be implemented in at least one hardware form of a DSP (Digital Signal Processing), an FPGA (Field-Programmable Gate Array), and a PLA (Programmable Logic Array). The processor 901 may also include a main processor and a coprocessor, where the main processor is a processor for Processing data in an awake state, and is also called a Central Processing Unit (CPU); a coprocessor is a low power processor for processing data in a standby state. In some embodiments, the processor 901 may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content required to be displayed by the display screen. In some embodiments, the processor 901 may further include an AI (Artificial Intelligence) processor for processing computing operations related to machine learning.

Memory 902 may include one or more computer-readable storage media, which may be non-transitory. The memory 902 may also include high-speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In some embodiments, a non-transitory computer readable storage medium in memory 902 is used to store at least one instruction for execution by processor 901 to implement the wellbore descaling methods provided by method embodiments herein.

In some embodiments, terminal 900 can also optionally include: a peripheral interface 903 and at least one peripheral. The processor 901, memory 902, and peripheral interface 903 may be connected by buses or signal lines. Various peripheral devices may be connected to the peripheral interface 903 via a bus, signal line, or circuit board. Specifically, the peripheral device includes: at least one of a radio frequency circuit 904, a display screen 905, a camera assembly 906, an audio circuit 907, a positioning assembly 908, and a power supply 909.

The peripheral interface 903 may be used to connect at least one peripheral related to I/O (Input/Output) to the processor 901 and the memory 902. In some embodiments, the processor 901, memory 902, and peripheral interface 903 are integrated on the same chip or circuit board; in some other embodiments, any one or two of the processor 901, the memory 902 and the peripheral interface 903 may be implemented on a separate chip or circuit board, which is not limited by this embodiment.

The Radio Frequency circuit 904 is used for receiving and transmitting RF (Radio Frequency) signals, also called electromagnetic signals. The radio frequency circuitry 904 communicates with communication networks and other communication devices via electromagnetic signals. The radio frequency circuit 904 converts an electrical signal into an electromagnetic signal to transmit, or converts a received electromagnetic signal into an electrical signal. Optionally, the radio frequency circuit 904 comprises: an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a subscriber identity module card, and so forth. The radio frequency circuit 904 may communicate with other terminals via at least one wireless communication protocol. The wireless communication protocols include, but are not limited to: metropolitan area networks, various generation mobile communication networks (2G, 3G, 4G, and 5G), Wireless local area networks, and/or WiFi (Wireless Fidelity) networks. In some embodiments, the radio frequency circuit 904 may also include NFC (Near Field Communication) related circuits, which are not limited in this application.

The display screen 905 is used to display a UI (User Interface). The UI may include graphics, text, icons, video, and any combination thereof. When the display screen 905 is a touch display screen, the display screen 905 also has the ability to capture touch signals on or over the surface of the display screen 905. The touch signal may be input to the processor 901 as a control signal for processing. At this point, the display 905 may also be used to provide virtual buttons and/or a virtual keyboard, also referred to as soft buttons and/or a soft keyboard. In some embodiments, the display 905 may be one, providing the front panel of the terminal 900; in other embodiments, the number of the display panels 905 may be at least two, and each of the display panels is disposed on a different surface of the terminal 900 or is in a foldable design; in other embodiments, the display 905 may be a flexible display disposed on a curved surface or a folded surface of the terminal 900. Even more, the display screen 905 may be arranged in a non-rectangular irregular figure, i.e. a shaped screen. The Display panel 905 can be made of LCD (Liquid Crystal Display), OLED (Organic Light-Emitting Diode), and other materials.

The camera assembly 906 is used to capture images or video. Optionally, camera assembly 906 includes a front camera and a rear camera. Generally, a front camera is disposed at a front panel of the terminal, and a rear camera is disposed at a rear surface of the terminal. In some embodiments, the number of the rear cameras is at least two, and each rear camera is any one of a main camera, a depth-of-field camera, a wide-angle camera and a telephoto camera, so that the main camera and the depth-of-field camera are fused to realize a background blurring function, and the main camera and the wide-angle camera are fused to realize panoramic shooting and VR (Virtual Reality) shooting functions or other fusion shooting functions. In some embodiments, camera assembly 906 may also include a flash. The flash lamp can be a monochrome temperature flash lamp or a bicolor temperature flash lamp. The double-color-temperature flash lamp is a combination of a warm-light flash lamp and a cold-light flash lamp, and can be used for light compensation at different color temperatures.

Audio circuit 907 may include a microphone and a speaker. The microphone is used for collecting sound waves of a user and the environment, converting the sound waves into electric signals, and inputting the electric signals to the processor 901 for processing or inputting the electric signals to the radio frequency circuit 904 for realizing voice communication. For stereo sound acquisition or noise reduction purposes, the microphones may be multiple and disposed at different locations of the terminal 900. The microphone may also be an array microphone or an omni-directional pick-up microphone. The speaker is used to convert electrical signals from the processor 901 or the radio frequency circuit 904 into sound waves. The loudspeaker can be a traditional film loudspeaker or a piezoelectric ceramic loudspeaker. When the speaker is a piezoelectric ceramic speaker, the speaker can be used for purposes such as converting an electric signal into a sound wave audible to a human being, or converting an electric signal into a sound wave inaudible to a human being to measure a distance. In some embodiments, audio circuit 907 may also include a headphone jack.

The positioning component 908 is used to locate the current geographic Location of the terminal 900 for navigation or LBS (Location Based Service). The Positioning component 908 may be a Positioning component based on the GPS (Global Positioning System) in the united states, the beidou System in china, the graves System in russia, or the galileo System in the european union.

Power supply 909 is used to provide power to the various components in terminal 900. The power source 909 may be alternating current, direct current, disposable or rechargeable. When power source 909 comprises a rechargeable battery, the rechargeable battery may support wired or wireless charging. The rechargeable battery may also be used to support fast charge technology.

In some embodiments, terminal 900 can also include one or more sensors 910. The one or more sensors 910 include, but are not limited to: acceleration sensor 911, gyro sensor 912, pressure sensor 913, fingerprint sensor 914, optical sensor 915, and proximity sensor 916.

The acceleration sensor 911 can detect the magnitude of acceleration in three coordinate axes of the coordinate system established with the terminal 900. For example, the acceleration sensor 911 may be used to detect the components of the gravitational acceleration in three coordinate axes. The processor 901 can control the display screen 905 to display the user interface in a landscape view or a portrait view according to the gravitational acceleration signal collected by the acceleration sensor 911. The acceleration sensor 911 may also be used for acquisition of motion data of a game or a user.

The gyro sensor 912 can detect the body direction and the rotation angle of the terminal 900, and the gyro sensor 912 can cooperate with the acceleration sensor 911 to acquire the 3D motion of the user on the terminal 900. The processor 901 can implement the following functions according to the data collected by the gyro sensor 912: motion sensing (such as changing the UI according to a user's tilting operation), image stabilization at the time of photographing, game control, and inertial navigation.

The pressure sensor 913 may be disposed on a side bezel of the terminal 900 and/or underneath the display 905. When the pressure sensor 913 is disposed on the side frame of the terminal 900, the holding signal of the user to the terminal 900 may be detected, and the processor 901 performs left-right hand recognition or shortcut operation according to the holding signal collected by the pressure sensor 913. When the pressure sensor 913 is disposed at a lower layer of the display screen 905, the processor 901 controls the operability control on the UI interface according to the pressure operation of the user on the display screen 905. The operability control comprises at least one of a button control, a scroll bar control, an icon control and a menu control.

The fingerprint sensor 914 is used for collecting a fingerprint of the user, and the processor 901 identifies the user according to the fingerprint collected by the fingerprint sensor 914, or the fingerprint sensor 914 identifies the user according to the collected fingerprint. Upon recognizing that the user's identity is a trusted identity, processor 901 authorizes the user to perform relevant sensitive operations including unlocking the screen, viewing encrypted information, downloading software, paying, and changing settings, etc. The fingerprint sensor 914 may be disposed on the front, back, or side of the terminal 900. When a physical key or vendor Logo is provided on the terminal 900, the fingerprint sensor 914 may be integrated with the physical key or vendor Logo.

The optical sensor 915 is used to collect ambient light intensity. In one embodiment, the processor 901 may control the display brightness of the display screen 905 based on the ambient light intensity collected by the optical sensor 915. Specifically, when the ambient light intensity is high, the display brightness of the display screen 905 is increased; when the ambient light intensity is low, the display brightness of the display screen 905 is reduced. In another embodiment, the processor 901 can also dynamically adjust the shooting parameters of the camera assembly 906 according to the ambient light intensity collected by the optical sensor 915.

Proximity sensor 916, also known as a distance sensor, is typically disposed on the front panel of terminal 900. The proximity sensor 916 is used to collect the distance between the user and the front face of the terminal 900. In one embodiment, when the proximity sensor 916 detects that the distance between the user and the front face of the terminal 900 gradually decreases, the processor 901 controls the display 905 to switch from the bright screen state to the dark screen state; when the proximity sensor 916 detects that the distance between the user and the front surface of the terminal 900 gradually becomes larger, the display 905 is controlled by the processor 901 to switch from the message screen state to the bright screen state.

Those skilled in the art will appreciate that the configuration shown in fig. 9 does not constitute a limitation of terminal 900, and may include more or fewer components than those shown, or may combine certain components, or may employ a different arrangement of components.

Embodiments of the present application also provide a non-transitory computer readable storage medium, wherein instructions in the storage medium, when executed by a processor of a terminal, enable the terminal to perform the wellbore descaling method provided by the above embodiments.

Embodiments of the present application also provide a computer program product containing instructions that, when run on a terminal, cause the terminal to perform the wellbore descaling method provided by the above embodiments.

Fig. 10 is a schematic structural diagram of a server according to this embodiment. The server may be a server in a cluster of background servers. Specifically, the method comprises the following steps:

the server 1000 includes a Central Processing Unit (CPU)1001, a system memory 1004 including a Random Access Memory (RAM)1002 and a Read Only Memory (ROM)1003, and a system bus 1005 connecting the system memory 1004 and the central processing unit 1001. The server 1000 also includes a basic input/output system (I/O system) 1006, which facilitates the transfer of information between devices within the computer, and a mass storage device 1007, which stores an operating system 1013, application programs 1014, and other program modules 1015.

The basic input/output system 1006 includes a display 1008 for displaying information and an input device 1009, such as a mouse, keyboard, etc., for user input of information. Wherein a display 1008 and an input device 1009 are connected to the central processing unit 1001 via an input-output controller 1010 connected to the system bus 1005. The basic input/output system 1006 may also include an input/output controller 1010 for receiving and processing input from a number of other devices, such as a keyboard, mouse, or electronic stylus. Similarly, the input-output controller 1010 also provides output to a display screen, a printer, or other type of output device.

The mass storage device 1007 is connected to the central processing unit 1001 through a mass storage controller (not shown) connected to the system bus 1005. The mass storage device 1007 and its associated computer-readable media provide non-volatile storage for the server 1000. That is, the mass storage device 1007 may include a computer-readable medium (not shown) such as a hard disk or CD-ROM drive.

Without loss of generality, computer readable media may comprise computer storage media and communication media. Computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes RAM, ROM, EPROM, EEPROM, flash memory or other solid state memory technology, CD-ROM, DVD, or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices. Of course, those skilled in the art will appreciate that computer storage media is not limited to the foregoing. The system memory 1004 and mass storage device 1007 described above may be collectively referred to as memory.

According to various embodiments of the application, the server 1000 may also operate as a remote computer connected to a network through a network, such as the Internet. That is, the server 1000 may be connected to the network 1012 through a network interface unit 1011 connected to the system bus 1005, or the network interface unit 1011 may be used to connect to another type of network or a remote computer system (not shown).

The memory also includes one or more programs, which are stored in the memory and configured to be executed by the CPU. The one or more programs include instructions for performing a wellbore descaling method provided by embodiments of the present application, comprising:

and after stopping injecting the mixed liquor into the well bore, controlling the solvent to be injected into the well bore through the descaling pipe, so that the cleaned dirt and the undissolved solute in the mixed liquor are discharged out of the well bore through the solvent.

Embodiments of the present application also provide a non-transitory computer readable storage medium, wherein instructions of the storage medium, when executed by a processor of a server, enable the server to perform a wellbore descaling method provided by the above embodiments.

Embodiments of the present application also provide a computer program product containing instructions that, when run on a server, cause the server to perform the wellbore descaling method provided by the above embodiments.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

The above description is only a preferred embodiment of the present application, and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like that are made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A wellbore descaling method, comprising:

2. The method of claim 1, wherein the method comprises:

3. The method of claim 2, wherein the method further comprises:

4. The method according to claim 2, wherein the uniform speed is 1-2 m/min.

5. The method of claim 1, wherein the solute particles are salt particles, the solvent is clear water, and the saturated solution is saturated brine.

6. The method of claim 1, wherein the displacement of mixed liquor injected into the wellbore is a reference displacement;

7. A wellbore descaling system, characterized in that the system comprises a pressure pump, an abrasive supply pump, a saturated solution tank, a mixing tank and a solvent tank;

8. The system of claim 7, further comprising a coiled tubing;

the other end of the continuous pipe is connected with the descaling pipe.

9. A wellbore descaling device, characterized in that the device comprises:

10. A computer apparatus, the apparatus comprising:

a processor;

a memory for storing processor-executable instructions;

wherein the processor is configured to perform the steps of the method of any of the above claims 1 to 6.

11. A computer-readable storage medium having stored thereon instructions which, when executed by a processor, carry out the steps of the method of any of the preceding claims 1 to 6.