CN114991706B

CN114991706B - Device, system and method for simulating performance of soluble bridge plug and related application

Info

Publication number: CN114991706B
Application number: CN202111661826.9A
Authority: CN
Inventors: 米凯夫; 张勇; 张国田; 王方明; 陈晓军; 范楷模; 李兴杰; 杜迎军; 王兴燕; 刘欣欣; 杨玉林; 张一帆
Original assignee: China National Petroleum Corp; CNPC Engineering Technology R&D Co Ltd; Beijing Petroleum Machinery Co Ltd
Current assignee: China National Petroleum Corp; CNPC Engineering Technology R&D Co Ltd; Beijing Petroleum Machinery Co Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2024-05-24
Anticipated expiration: 2041-12-31
Also published as: CN114991706A

Abstract

The invention discloses a soluble bridge plug performance simulation test device, a system and a method and related application. The device comprises: the outer cylinder assembly, the test sleeve assembly and the pressing joint are in an assembled state: the test sleeve assembly is positioned in the outer cylinder assembly, the outer end of the test sleeve assembly extends out and is connected with the pressing joint, the inner end of the test sleeve assembly is communicated with the cavity of the outer cylinder assembly, and the test sleeve assembly is provided with a middle through hole for accommodating the soluble bridge plug; the pressurizing connector is connected to the outer end of the test sleeve assembly so as to inject a simulation solution into the first cavity above the soluble bridge plug and pressurize the simulation solution; the outer cylinder assembly is provided with a water inlet and a water outlet for injecting the simulation solution into the second cavity below the soluble bridge plug, and is also provided with a temperature measuring instrument and a pressure measuring instrument. The setting, bearing and dissolution performance of the soluble bridge plug can be tested by simulating the temperature, pressure and mineralization environment in the pit, so that the product quality and stability of the soluble bridge plug can be effectively controlled, and a powerful support is provided for research and development and testing of the soluble bridge plug.

Description

Device, system and method for simulating performance of soluble bridge plug and related application

Technical Field

The invention relates to the technical field of downhole tool testing, in particular to a device, a system and a method for simulating performance of a soluble bridge plug and related applications.

Background

As the oil field enters the middle and high water content period, the layer system to be developed gradually develops to a thin poor layer, and in order to increase the oil recovery ratio and improve the oil field production efficiency, the layered injection and production is one of the effective means for the development of special oil layers. At present, the shale gas horizontal well development process mostly adopts a bridge plug-perforation combined fracturing technology, and the application of a downhole temporary plugging tool prepared from a soluble material in fracturing construction can greatly improve the operation efficiency and economic indexes. Compared with the traditional drillable bridge plug, the soluble bridge plug can realize complete dissolution of the bridge plug body by means of the temperature of a shaft and a certain mineralization liquid environment after fracturing, ensures the production of the whole diameter of the shaft, has the advantages of low comprehensive cost, short production time, reduced operation risk and realization of secondary transformation, reduces the risk and cost of continuous pipe drilling plug, and saves the completion operation time.

The performance of the soluble bridge plug in underground operation directly influences the reliability and operation success/failure of staged fracturing construction of the horizontal well, and under the conditions of certain underground temperature and mineralization degree, the performances of anchoring setting, bearing capacity and the like of the bridge plug play a decisive role, namely the bridge plug must be ensured to meet the process requirements of stable setting and sealing at the bottom of the well, and after the use, the soluble bridge plug is required to be completely dissolved to ensure that a well shaft is not blocked. In the design and development of the soluble bridge plug, in order to further verify or improve the bearing capacity and anchoring stability of the soluble bridge plug, ensuring the downhole operation performance of the soluble bridge plug, the performance of the soluble bridge plug is necessary to be tested.

Disclosure of Invention

The inventor finds that the conventional soluble bridge plug testing method is difficult to completely simulate the underground actual operation environment, for example, some soluble bridge plug testing devices can only fill a solution with a certain mineralization degree into the upper section of the bridge plug, the lower section of the bridge plug is not contacted with the solution, so that the heating temperature is uneven at high temperature, the lower end is not contacted with the solution, the actual dissolution environment cannot be simulated, for example, a sleeve pipe with the soluble bridge plug is directly soaked in a larger solution tank for dissolution test, and the high temperature condition cannot be simulated; and is also provided with

The whole automation degree and the intelligent degree of the existing test device are lower. In addition, with the deep development of shale oil and shale gas, the requirements on the overall performance index, pressure and temperature grade of the soluble bridge plug are higher, the development is continuously carried out towards high temperature, high pressure, quick dissolution and other directions, the requirements of higher simulation tests and tests are difficult to meet by the existing test platform, and powerful guarantee cannot be provided for the comprehensive performance test of the soluble bridge plug.

Therefore, the test platform needs to be upgraded in the aspects of functionality, visualization, informatization, automatic remote monitoring and the like; a set of multifunctional testing platform for testing the comprehensive performance of the soluble bridge plug, which has mature process, perfect functions and higher automation and informatization degrees, can fully simulate the working environments with different temperatures, pressures and mineralization degrees in the pit, forms a complete testing method, and lays a powerful foundation for building and constructing a standardized testing platform for the industry of the soluble bridge plug.

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a soluble bridge plug performance simulation test apparatus, system and method and related applications that overcome or at least partially solve the above problems.

The embodiment of the invention provides a soluble bridge plug performance simulation test device, which comprises: the outer cylinder assembly, the test sleeve assembly and the pressing joint, wherein the test device comprises a non-assembly state and an assembly state, and the test sleeve assembly comprises the following components in the assembly state:

The test sleeve assembly is positioned in the outer barrel assembly, the outer end of the test sleeve assembly extends out and is connected with the pressing joint, the inner end of the test sleeve assembly is communicated with the cavity of the outer barrel assembly, and the test sleeve assembly is provided with a middle through hole for accommodating the soluble bridge plug;

the pressurizing connector is connected to the outer end of the test sleeve assembly so as to inject a simulation solution into the first cavity above the soluble bridge plug and pressurize the simulation solution;

The outer barrel assembly is provided with a water inlet and a water outlet so as to inject simulation solution into the second cavity below the soluble bridge plug, and the outer barrel assembly is also provided with a temperature measuring instrument and a pressure measuring instrument.

In some alternative embodiments, the test cannula assembly comprises a test cannula and a cannula end cap;

The test cannula having a central throughbore to accommodate a soluble bridge plug;

the sleeve end cover is arranged at the inner end of the test sleeve, and the filter screen is arranged on the sleeve end cover.

In some alternative embodiments, the sleeve end cap is provided with internal threads, and is connected with external threads at the inner end of the test sleeve through the internal threads;

the sleeve end cover is provided with a plurality of end cover through holes with different diameters, and the diameters of the end cover through holes are 3-15 mm.

In some alternative embodiments, the filter mesh is a dense wire mesh of stainless steel material to filter soluble bridge plug dissolution residues.

In some alternative embodiments, the outer barrel assembly includes an outer barrel, a left end cap, and a right end cap;

the outer barrel is provided with a middle through hole for accommodating a test sleeve;

The left end cover is arranged at the left end of the sleeve and provided with a left end cover mounting hole for mounting the test sleeve and the pressurizing connector;

The right end cover is installed in the sleeve right-hand member, is equipped with into water ball valve and play water ball valve.

In some alternative embodiments, the left end cover is provided with external threads and is connected with the internal threads of the left end of the outer cylinder; the right end cover is provided with an internal thread and is connected with an external thread at the right end of the outer cylinder; the threaded connection part of the left end cover and the right end cover is provided with a sealing ring;

The right end cover plate is provided with a threaded through hole for installing a water inlet ball valve and a water outlet ball valve.

In some alternative embodiments, one or a combination of the following is further provided on the outer wall of the outer cylinder: at least one pressure gauge, at least one temperature sensor, at least one overflow safety valve.

In some alternative embodiments, the device further comprises a support block disposed within the outer barrel assembly and below the test sleeve assembly, the support block being of an insulating material having an arcuate support surface that mates with the test sleeve assembly.

In some alternative embodiments, the apparatus further comprises a support frame;

the support frame includes base, two at least backup pads and corresponding ferrule, the backup pad has the arc to hold in the palm, the arc holds in the palm with the ferrule cooperation that corresponds in order to fix the urceolus subassembly.

In some alternative embodiments, an induction coil is also disposed on the outer barrel wall of the outer barrel assembly; in a corresponding manner,

The apparatus also includes a coil securing assembly to support the induction coil.

The embodiment of the invention also provides a system for simulating and testing the performance of the soluble bridge plug, which comprises the following components: the hydraulic injection control subsystem, the hydraulic injection subsystem and the soluble bridge plug performance simulation test device are used for simulating the performance of the bridge plug;

The test sleeve assembly is used for accommodating the soluble bridge plug and the plug or accommodating the soluble bridge plug;

The liquid injection control pressure subsystem is used for controlling the liquid injection subsystem to inject the simulation solution into the first cavity and/or the second cavity; and pressurizing the simulated solution according to a preset test pressure of the soluble bridge plug setting, bearing or dissolution test.

In some alternative embodiments, the system further comprises an induction heating subsystem for heating the simulated solution according to a preset test temperature for a soluble bridge plug setting, pressure bearing or dissolution test.

In some optional embodiments, the hydraulic injection control subsystem is further configured to obtain pressure change data of the soluble bridge plug in a setting and bearing test process, and determine bearing and sealing performances of the soluble bridge plug; or obtaining the dissolution condition of the soluble bridge plug in dissolution test engineering, and determining the dissolution performance of the soluble bridge plug.

In some alternative embodiments, the hydraulic control subsystem includes a control operation module, a pressure monitoring module, and a high pressure hose;

The control operation module is used for controlling the high-pressure hose to inject the simulation solution into the first cavity based on the set pressurization parameters and the pressure data monitored by the pressure monitoring module, and controlling at least one of the pressurization speed and the pressurization amount of the simulation solution;

the high-pressure hose is connected with the liquid injection subsystem and a pressurizing connector in the soluble bridge plug performance simulation test device so as to inject the simulation solution provided by the liquid injection subsystem into the first cavity;

The pressure monitoring module is used for monitoring the pressure of the simulation solution in the first cavity.

In some alternative embodiments, the induction heating subsystem comprises a cycle monitoring module, a temperature measuring module, a monitoring control module;

The temperature measuring module is connected with a temperature sensor in the soluble bridge plug performance simulation test device to measure the temperature of the external surface of the device and the simulation solution in the device;

The system comprises a circulation monitoring module, a control module and a control module, wherein the circulation monitoring module is used for monitoring the working state of the system and realizing an abnormality alarm function, and the working state comprises at least one of an induction coil heating working state, a water circulation cooling state, a working state of a soluble bridge plug performance simulation test device and a system abnormality state;

The monitoring control module is used for acquiring the temperature data measured by the temperature measuring module and the monitoring data of the circulating detection module, and controlling the working of the simulation coil to heat the simulation solution according to the acquired temperature data and the preset temperature control parameters; and adjusting the working state of the corresponding part in the system according to the monitoring data.

In some alternative embodiments, the priming subsystem includes at least one solution tank containing a simulation solution, a transfer pump, and a priming line;

The liquid injection pipeline is connected with the outer barrel assembly and is provided with a water inlet and a water outlet so as to inject simulation solution into the second cavity; the liquid injection pipeline is connected with the pressurizing connector so as to inject the simulation solution into the first cavity;

The delivery pump is connected with the solution tank so as to pump the simulated solution in the solution tank into the liquid injection pipeline.

In some alternative embodiments, the system further comprises a main power supply connecting the hydraulic control subsystem and the induction heating subsystem.

The embodiment of the invention also provides a soluble bridge plug performance simulation test method, which is realized based on the soluble bridge plug performance simulation test device and comprises the following steps:

Sealing the soluble bridge plug and the plug in the test sleeve assembly, and filling the first cavity with a simulation solution;

And pressurizing the simulation solution in the first cavity to a set first test pressure according to a preset pressurizing parameter, entering a pressure stabilizing process and continuously setting a first pressure stabilizing time period, acquiring pressure change data of the soluble bridge plug, and determining the pressure bearing and sealing performance of the soluble bridge plug.

In some alternative embodiments, the method further comprises:

Filling the second cavity with a simulation solution;

Pressurizing the simulation solution in the first cavity to a set second test pressure according to preset pressurizing parameters, and heating the liquids in the first cavity and the second cavity to a set test temperature according to preset temperature control parameters;

and under the set test temperature, the pressure stabilizing process is continuously carried out for the set second pressure stabilizing time period, the pressure change data of the soluble bridge plug are obtained, and the pressure bearing and sealing performance of the soluble bridge plug under the set test temperature are determined.

In some alternative embodiments, the method further comprises:

Setting a third test pressure of the second cavity according to the set test temperature, and pressurizing the simulation solution in the second cavity to the set third test pressure; the third test pressure is less than the first test pressure and less than the second test pressure.

In some alternative embodiments, the pressurizing the simulated solution in the first chamber to the set first test pressure according to the preset pressurizing parameter includes:

Step pressurizing is carried out on the liquid in the first cavity according to preset pressure step intervals, each step pressurizing process comprises a pressure increasing stage and a pressure stabilizing stage, the pressure is increased by one pressure step in each pressure increasing stage, and each pressure stabilizing stage continuously sets third pressure stabilizing time duration until the liquid in the first cavity is increased to a set first test pressure; or (b)

Pressurizing the simulation solution in the first cavity to set a second test pressure according to preset pressurizing parameters, including:

And carrying out step pressurization on the liquid in the first cavity according to preset pressure step intervals, wherein each step pressurization process comprises a step-up stage and a pressure stabilizing stage, each step-up stage increases the pressure by one pressure step, and each pressure stabilizing stage continuously sets fourth pressure stabilizing duration until the liquid in the first cavity is increased to a set second test pressure.

In some alternative embodiments, the enclosing the dissolvable bridge plug and plug within the test cannula assembly comprises:

the soluble bridge plug is connected with the connecting adapter and the setting tool and is arranged in the test sleeve;

The setting tool is driven to push the soluble bridge plug through the connecting adapter, the soluble bridge plug is set in the test sleeve, the plug is arranged in the central hole of the soluble bridge plug, the test sleeve is arranged in the outer cylinder component, and the pressing joint is connected.

In some alternative embodiments, the method further comprises:

Taking out the inner plug of the test sleeve assembly, and sealing the soluble bridge plug in the test sleeve assembly to enable the first cavity to be communicated with the second cavity;

and testing the dissolution performance of the soluble bridge plug in the simulated solution according to a preset dissolution test flow.

In some alternative embodiments, testing the solubility of the soluble bridge plug in the simulated solution according to a predetermined dissolution test procedure comprises:

performing at least one-stage dissolution test on the soluble bridge plug until the dissolution residue of the soluble bridge plug meets the set requirements; the dissolution test at each stage included: injecting a simulation solution into the first cavity and/or the second cavity, heating the simulation solution to a set dissolution temperature, waiting for a set first dissolution time period, and discharging well fluid in the cavity;

the dissolution of the soluble bridge plug at each stage is obtained, and the dissolution performance of the soluble bridge plug is determined.

In some alternative embodiments, the composition of the simulated solution is determined from a well fluid in a wellbore in which the soluble bridge plug is to be used, the first and second test pressures are determined from a wellbore ambient pressure in which the soluble bridge plug is to be used, and the test and dissolution temperatures are determined from a wellbore ambient temperature in which the soluble bridge plug is to be used.

The embodiment of the invention provides an application of the soluble bridge plug performance simulation test device or the soluble bridge plug performance simulation test system in a soluble bridge plug performance simulation test.

The embodiment of the invention provides a method for simulating and testing the performance of a soluble bridge plug, which is realized by using the system for simulating and testing the performance of the soluble bridge plug.

The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:

According to the device for simulating the performance of the soluble bridge plug, the soluble bridge plug is set in the test sleeve assembly, the simulated solution is injected to simulate the underground mineralization degree, the temperature and the pressure can be regulated and controlled to simulate the underground temperature and pressure environment, especially the underground high-temperature and high-pressure operation environment, so that the setting, pressure bearing and dissolution performance of the soluble bridge plug are tested under the condition that the temperature, the pressure and the mineralization degree environment are basically the same as those of the underground, the test data which is closer to the actual application environment are obtained, the various performances of the soluble bridge plug are tested more accurately, and the quality of the soluble bridge plug can be controlled well.

The system and the method for simulating the performance of the soluble bridge plug can automatically control various testing environment parameters of the performance test of the soluble bridge plug, automatically analyze and process after obtaining the testing data, automatically adjust the working state of the testing system so as to better simulate the real testing environment, obtain the testing data more in line with the real use condition, optimize the performance testing process of the soluble bridge plug, and have mature process, perfect functions, automation and visualization, and further improve the controllability of the testing process.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.

The technical scheme of the invention is further described in detail through the drawings and the embodiments.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:

FIG. 1 is a schematic diagram of a device for simulating performance of a soluble bridge plug in an embodiment of the invention;

FIG. 2 is a schematic diagram of a fixing structure of a device for simulating performance of a soluble bridge plug according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a system for simulating performance of a soluble bridge plug according to an embodiment of the present invention;

FIG. 4 is a flow chart of a method of simulating performance of a soluble bridge plug according to a first embodiment of the invention;

FIG. 5 is a flow chart of a method for simulating performance of a soluble bridge plug according to a second embodiment of the present invention;

FIG. 6 is a flow chart of a method for simulating performance of a soluble bridge plug in accordance with a third embodiment of the present invention.

Reference numerals illustrate:

the device comprises a 1-liquid injection control pressure subsystem, a 2-soluble bridge plug performance simulation test device, a 3-induction heating subsystem, a 4-liquid injection subsystem and a 5-main power supply;

11-a control operation module, 12-a pressure monitoring module and 13-a high-pressure hose;

21-pressing joint, 22-test sleeve assembly, 23-outer cylinder assembly, 24-soluble bridge plug, 25-supporting block, 26-supporting frame and 27-coil fixing assembly;

221-test cannula, 222-cannula end cap, 223-filter mesh;

231-outer cylinder, 232-left end cover, 233-right end cover, 234-water inlet ball valve, 235-water outlet ball valve, 236-pressure gauge, 237, 239-temperature sensor, 238-overflow safety valve;

241-bridge plug body, 242-plug;

261-base, 262-support plate, 263-ferrule, 264-bolt and nut;

31-a circulation monitoring module, 32-a monitoring control module, 33-a temperature measuring module and 34-an induction coil;

41-delivery pump, 42-solution tank, 43-liquid injection pipeline.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In order to better control the quality of the soluble bridge plug, the embodiment of the invention provides a device, a system and a method for simulating the performance of the soluble bridge plug, which can simulate different temperature, pressure and mineralization environments in the pit and test the comprehensive performance of setting, bearing, dissolving and the like of the soluble bridge plug

The embodiment of the invention provides a soluble bridge plug performance simulation test device, the structure of which is shown in figure 1, comprising: the outer cylinder assembly 23, the test sleeve assembly 22 and the pressing joint 21, the test device comprises a non-assembled state and an assembled state, and the assembled state is as follows:

The test sleeve assembly 22 is positioned in the outer cylinder assembly 23, the outer end of the test sleeve assembly 22 extends out and is connected with the pressing joint 21, the inner end of the test sleeve assembly is communicated with the cavity of the outer cylinder assembly 23, and the test sleeve assembly 22 is provided with a middle through hole for accommodating the soluble bridge plug 24;

The crimp head 21 is connected to the outer end of the test cannula assembly 22 to inject a simulated solution into the first cavity above the soluble bridge plug 24 and pressurize it;

The outer barrel assembly 23 is provided with a water inlet and a water outlet for injecting the simulation solution into the second cavity below the soluble bridge plug, and the outer barrel assembly 23 is also provided with a temperature measuring instrument and a pressure measuring instrument.

According to the device for simulating the performance of the soluble bridge plug, the soluble bridge plug is set in the test sleeve assembly, the simulated solution is injected to simulate the underground mineralization degree, and the temperature and the pressure can be adjusted and controlled to simulate the underground temperature and the pressure environment, so that under the condition that the temperature, the pressure and the mineralization degree environment are basically the same as those of the underground, the setting, the pressure bearing and the dissolution performance of the soluble bridge plug are tested, the test data which is closer to the actual application environment is obtained, the various performances of the soluble bridge plug are tested more accurately, and the quality of the soluble bridge plug can be controlled well.

In some alternative embodiments, the test sleeve assembly 22 described above includes a test sleeve 221 and a sleeve end cap 222; the test cannula 221 has an intermediate through bore to accommodate the soluble bridge plug 24; a sleeve end cap 222 is mounted on the inner end of the test sleeve 221, and a filter mesh 223 is provided on the sleeve end cap 222.

The sleeve end cover 222 is provided with internal threads, and is connected with external threads at the inner end of the test sleeve 221 through the internal threads; the sleeve end cover 222 is provided with a plurality of end cover through holes with different diameters, and the diameters of the end cover through holes are 3-15 mm. The sleeve end cap 222 is a protective end cap, and is mainly used for blocking the impact force of the soluble bridge plug in case of loose seal or rapid sliding, so as to play a role of protection.

The filter mesh 223 is a dense wire mesh made of stainless steel so as to filter the soluble bridge plug dissolution residue. During the experiment, particulate impurities in the dissolved residues of the soluble bridge plugs were prevented from flowing out of the test cannula, blocking or damaging devices provided on the outer cartridge, such as overflow safety valves, temperature sensors, pressure gauges, etc.

The test sleeve 221 can be designed according to the test requirement, preferably, the specification, parameters and the like of the standard sleeve are completely consistent with those of the petroleum industry, and the left end cover 232 and the sleeve end cover 222 are respectively connected by cutting a section and arranging external threads at two ends; the parameters of the test sleeve 221, such as size, specification, steel grade, etc., are adjusted according to the soluble bridge plug tests of different models and sizes.

The above-mentioned crimp head 21 is equipped with the external screw thread, and center department is equipped with screw hole, sealed conical surface and annotates the liquid through-hole to the device can form sealed inside cavity, and is connected high-pressure hose in order to annotate the liquid to the cavity through the screw hole.

In some alternative embodiments, the outer barrel assembly 23 includes an outer barrel 231, a left end cap 232, and a right end cap 233; the outer cylinder 231 has a middle through hole to accommodate the test socket 221; the left end cover 232 is arranged at the left end of the sleeve 231 and is provided with a left end cover mounting hole for mounting the test sleeve 221 and the pressing joint 21; the right end cover 233 is mounted on the right end of the sleeve 231 and is provided with a water inlet ball valve 234 and a water outlet ball valve 235.

The outer cylinder 231 is integrally tubular, threads are arranged at two ends of the outer cylinder and are respectively connected and sealed with the left end cover 232 and the right end cover 233, and specifically, the left end cover 232 is provided with external threads and is connected with internal threads at the left end of the outer cylinder 231. The left end cover 232 both ends all are equipped with the internal thread, are connected with the joint 21 and test sleeve 221 that beat respectively, and right-hand member cover 233 is equipped with the internal thread, with the external screw thread connection of urceolus 231 right-hand member, the right-hand member is equipped with the screw thread through-hole on the 233 apron for install water inlet ball valve 234 and play water ball valve 235.

The screw connection portion of the left end cover 232 and the right end cover 233 is provided with a sealing ring for sealing the annulus between the test sleeve 221 and the outer cylinder 231 and ensuring that a high-pressure sealing cavity can be formed in the test sleeve 221. The water inlet ball valve 234 and the water outlet ball valve 235 can be made of high-temperature resistant and corrosion resistant materials.

The outer cylinder wall of the outer cylinder 231 is also provided with one or a combination of the following: at least one pressure gauge, at least one temperature sensor, at least one overflow safety valve. Shown in fig. 1 are a pressure gauge 236 on the outer cylinder 231, a temperature sensor 237, an overflow safety valve 238, and a temperature sensor 239 shown in fig. 2, etc. The outer cylinder 231 is also provided with a plurality of sealing cone threaded holes, and the sealing cone threaded holes can be R1/2 sealing cone threads used for installing and fixing components such as a pressure gauge, an overflow safety valve, a temperature sensor and the like. The overflow safety valve can be a high-temperature-resistant corrosion-resistant adjustable spring micro-opening closed safety valve. Wherein, the temperature sensor 237 and 239 are high-precision thermal resistance temperature sensors, wherein the temperature sensor 237 is inserted into the inner cavity through the wall of the outer cylinder; the temperature sensor 239 is a patch type temperature sensor, and is attached to the outer surface of the outer cylinder to measure the surface temperature and the temperature of the set induction coil. The types of the temperature sensor and the pressure sensor can be selected according to the needs.

The sealing bridge plug for testing described above includes a bridge plug body 241 and a plug 242. The plug 242 is provided with a sealing groove, and is provided with a sealing ring for sealing the central hole of the soluble bridge plug body 241, and an upper end sealing cavity and a lower end sealing cavity of the bridge plug are established. In practical application, when setting and bearing tests are carried out, the plug 242 needs to be provided, so that the two ends of the bridge plug are not communicated with liquid flow, and the bearing and sealing performance of the bridge plug is tested. In the dissolution test, the plug 242 was not provided, and both ends of the bridge plug were connected, and the dissolution characteristics of the bridge plug when immersed in the simulated liquid were tested.

In some alternative embodiments, the device further comprises a support block 25 disposed within the outer barrel assembly 23 below the test sleeve assembly 22, the support block 25 being of an insulating material and having an arcuate support surface that mates with the test sleeve assembly 22. The cross section of the supporting block 25 is in a semicircular shape, the outer side surface of the supporting block is matched with the inner surface of the outer cylinder 231 in shape, and the inner side surface of the supporting block is matched with the outer surface of the test sleeve 221 in shape, so that the supporting block mainly plays a role in supporting the test sleeve 221.

In some alternative embodiments, the apparatus further comprises a support bracket 26; the support bracket 26 includes a base 261, at least two support plates 262 and corresponding ferrules 263, the support plates 262 having arcuate brackets that cooperate with the corresponding ferrules 263 to secure the outer barrel assembly 22. The base 261 may be welded using section steel for supporting and fixing the outer cylinder 231 and the induction coil assembly. The support plate 262 and the ferrule 263 are connected by a bolt and nut 264 to form a fixed assembly to fixedly support the test device. The supporting plate 262 is formed by processing a steel plate, the radius of an arc groove at the upper end of the supporting plate is equal to that of the outer cylinder, the hoop 263 is of a U-shaped structure, and screw holes are formed at two ends of the hoop and are used for hooping the outer cylinder and then connected with the supporting plate through screw nuts and pressed.

In some alternative embodiments, the outer barrel 231 wall of the outer barrel assembly 23 also has an induction coil 34 disposed thereon; correspondingly, the device also comprises a coil fixing assembly 27 for supporting the induction coil 34. The induction coil 34 may be used as a part of an induction heating subsystem, and then sleeved on the outer cylinder wall in use, or may be used as a part of the above-mentioned soluble bridge plug performance simulation test device, and fixedly installed on the outer cylinder wall, and then connected with the induction heating subsystem in use.

Based on the same inventive concept, the embodiment of the invention also provides a soluble bridge plug performance simulation test system, the structure of which is shown in fig. 3, comprising: the device comprises a hydraulic injection control subsystem 1, a soluble bridge plug performance simulation test device 2 and a hydraulic injection subsystem 4.

A soluble bridge plug performance simulation test device 2 for including a test sleeve assembly for accommodating a soluble bridge plug and a plug, or accommodating a soluble bridge plug; specifically, the dissolvable bridge plug of 241 may be seated within the trial cannula assembly 22 and installed with a plug to close the trial cannula assembly 22 or may be sealed within the trial cannula assembly 22.

The liquid injection control subsystem 1 is used for controlling the liquid injection subsystem 4 to inject the simulation solution into the first cavity and/or the second cavity; and pressurizing the simulated solution according to a preset test pressure of the soluble bridge plug setting, bearing or dissolution test.

In some alternative embodiments, the system further comprises an induction heating subsystem 3 for heating the simulated solution according to a preset test temperature for a soluble bridge plug setting, pressure bearing or dissolution test. When the induction heating subsystem 3 is arranged in the simulation test system for the performance of the soluble bridge plug, the performance of the soluble bridge plug at the set temperature can be tested, and when the induction heating subsystem 3 is not arranged, the pressure-bearing performance of the soluble bridge plug can be tested.

The hydraulic injection control subsystem is also used for acquiring pressure change data of the soluble bridge plug in the setting and pressure-bearing testing process and determining pressure-bearing and sealing performances of the soluble bridge plug; or obtaining the dissolution condition of the soluble bridge plug in dissolution test engineering, and determining the dissolution performance of the soluble bridge plug.

The hydraulic control subsystem comprises a control operation module 11, a pressure monitoring module 12 and a high-pressure hose 13. The control operation module 11 is used for controlling the liquid injection subsystem to inject the simulation solution into the first cavity through the high-pressure hose 13 and controlling at least one of the pressurizing speed and the pressurizing amount of the simulation solution based on the set pressurizing parameters and the pressure data monitored by the pressure monitoring module 12. The pressure monitoring module 12 is used to monitor the pressure of the simulated solution in the first chamber. The high pressure hose 13 connects the priming subsystem 4 with the crimp fitting 21 in the soluble bridge plug performance simulation test device 2 to inject the simulation solution provided by the priming subsystem 4 into the first cavity.

The hydraulic control subsystem 1 test system simulates the execution unit of bottom hole pressure, which controls the hydraulic components in the hydraulic control subsystem 4 to work through the control operation module 11, regulates the pressure change and the circulation of hydraulic oil, realizes the functions of injecting the simulated solution through the high-pressure hose 13 and timely controlling the pressure in the test device, and the control operation module 11 can accurately control the pressurizing amount and the pressurizing speed, and timely regulate and lock the state; the pressure detection module 12 may also automatically monitor and record the numerical relationship between pressure changes and time, and plot curves, etc.

The structure of the test device 2 for simulating the performance of the soluble bridge plug is described with reference to fig. 1, the test device 2 is a key component of a test system, and the whole design is to enable the upper part of the bridge plug to be filled with a simulation solution and to be continuously stabilized, and the lower part of the bridge plug to be always soaked in the environment of the simulation solution and to keep a certain set temperature, so that the temperature and pressure environment of the soluble bridge plug during pressure bearing of fracturing operation are simulated.

In some alternative embodiments, the induction heating subsystem 3 includes a cycle monitoring module 31, a monitoring control module 32, and a temperature measurement module 33;

A temperature measurement module 33 connected with a temperature sensor in the soluble bridge plug performance simulation test device to measure the temperature of the external surface of the device and the simulation solution in the device;

the circulation monitoring module 31 is configured to monitor a system operating state and implement an abnormality alarm function, where the operating state includes at least one of an induction coil heating operating state, a water circulation cooling state, an operating state of a soluble bridge plug performance simulation test device, and a system abnormality state;

The monitoring control module 32 is used for acquiring the temperature data measured by the temperature measurement module 33 and the monitoring data of the circulation detection module 31, and controlling the induction coil 34 to work according to the acquired temperature data and preset temperature control parameters so as to heat the analog solution; and adjusting the working state of the corresponding part in the system according to the monitoring data.

The induction heating subsystem 3 is an execution unit of the test system to simulate the bottom hole temperature. The circulation monitoring module 31 is connected with the monitoring control module 32, and provides the functions of water circulation cooling, system state monitoring, abnormal condition alarming and the like in the working engineering of the induction heating subsystem. And the monitoring control module 32 is a core part of the induction heating system; after being connected with a main power supply 5, the alternating current is converted into high-frequency current; and modulates and controls whether the whole induction heating subsystem and the induction coil work or not, and adjusts the working mode and the working state of the whole system according to signals and data fed back by the temperature measuring module 33.

The temperature measurement module 33 is mainly used for measuring the temperature of the solution on the surface of the outer cylinder and in the cavity of the test device, and feeds back to the monitoring control module 32 in the induction heating subsystem at proper time, and assists in completing the adjustment and control of the heating temperature by the monitoring control module 32. The temperature measurement module 33 can be connected with a plurality of sensors, and in practical application, temperature data acquisition is carried out according to the need, taking the test device as an example, three temperature sensors are arranged on an outer cylinder of the device, high-precision thermal resistance temperature sensors can be adopted, and two sensors adopt patch type temperature sensors 239 which are tightly attached to the outer circular surface of the outer cylinder and are positioned below the copper pipe of the induction coil; the other sensor adopts an inserted temperature sensor 237 which is connected with and inserted into the cavity of the outer cylinder through screw threads; the temperature sensor near the middle part of the coil in the axial direction is used as a main control temperature, namely the temperature control of the monitoring control module 32 takes the temperature monitored and fed back by the sensor as main reference data, and other temperature sensors feed back as auxiliary reference data. In addition, the number of the temperature sensors of the temperature measurement module can be increased as required, and the positions of the main control temperature sensors are only required to be reasonably determined.

The induction coil 34 is fixed and supported by the coil fixing assembly 27, the induction coil 34 is processed into a spiral ring shape by adopting a rectangular copper tube and is used for being arranged outside the test device, and pipe cables at two ends of the induction coil are connected with the monitoring control module 32; when the monitoring control module 32 starts to operate, the induction coil 34 directly inductively heats the outer cylinder 231. The coil fixing members 27 are made of insulating materials for fixing and supporting the induction coil, and maintain the overall shape and position thereof all the time.

In some alternative embodiments, the priming subsystem 4 includes at least one solution tank 42 containing a simulation solution, a transfer pump 41, and a priming line 43;

The liquid injection pipeline 43 is connected with the outer barrel assembly 23 and is provided with a water inlet and a water outlet so as to inject the simulation solution into the second cavity; and the liquid injection pipeline is connected with the pressurizing connector so as to inject the simulation solution into the first cavity

The transfer pump 41 is connected to the solution tank 42 to pump the analog solution in the solution tank 42 into the priming line 43. The transfer pump may be an electric booster (constant pressure) pump.

The liquid injection subsystem 4 is used as a storage and supply subsystem of the simulated solution, and is mainly used for injecting and continuously compensating the solution with a certain mineralization degree into the inner cavity of the outer cylinder, wherein the solution tank and the liquid injection pipeline can be arranged according to the needs. As shown in fig. 2, the solution tank 42 is connected to the transfer pump 41, the transfer pump 41 is located on a liquid inlet pipe connected to the water inlet, and a liquid outlet pipe connected to the water outlet is directly connected to the solution tank 42 to recover the solution. The liquid injection pipeline comprising a liquid inlet pipeline and a liquid outlet pipeline is communicated among the outer cylinder water inlet ball valve, the electric booster pump and the solution tank, and a solution injection channel is established; when the circulation of the solution in the outer barrel of the test device is required, the circulation of the solution can be established only by opening the water outlet ball valve below the outer barrel. The solution box is provided with a hydraulic switch type upper cover, and the box is provided with a drain valve for containing solutions with different mineralization degrees.

In fig. 2, a solution tank 42 is schematically shown, and only this part is shown in fig. 2, by way of example, with a water inlet and outlet on the outer barrel assembly connected by a liquid injection line 43; while the high-pressure hose is connected to another solution tank via a separate filling line, a simulation solution is filled into the first chamber via a high-pressure connection 21, which is not shown in fig. 2. In practical application, the solution tank connected with the high-pressure hose and the solution tank connected with the water inlet and outlet on the outer barrel component can be the same or not, so long as the simulation solutions injected in one simulation experiment are the same.

In some alternative embodiments, the system further comprises a main power supply 5 connecting the hydraulic control subsystem 1 and the induction heating subsystem 3. The hydraulic control injection subsystem 1 and the induction heating subsystem 3 are powered by a main power supply 5.

Based on the same inventive concept, the embodiment of the invention provides a soluble bridge plug performance simulation test method which is realized based on the soluble bridge plug performance simulation test device or system and is used for testing the setting, bearing and dissolving characteristics of a soluble bridge plug.

The working process of setting, anchoring and bearing the soluble bridge plug underground is that the bridge plug is released by providing a certain setting force through a setting tool, the soluble bridge plug is set at a designated position in the casing, and the slips are anchored on the inner wall of the casing; the sealing rubber cylinder is pressed close to the casing wall to form sealing, so that the casing is sealed. Thus, the setting pressure test of a soluble bridge plug is to ensure that the bridge plug forms effective initial anchoring and sealing downhole and ensures the reliability of its setting.

The following describes the embodiments by way of specific examples.

Example 1

The first embodiment of the invention provides a method for simulating and testing the performance of a soluble bridge plug, which takes the test of the setting and pressure-bearing performance of the soluble bridge plug at normal temperature or without setting temperature as an example, and the flow is shown in figure 4, and comprises the following steps:

Step S101: the soluble bridge plug and the plug are sealed in the test sleeve assembly, and the first cavity is filled with the simulation solution.

In the step, a soluble bridge plug is connected with a connecting adapter and a setting tool and is placed in a test sleeve; the setting tool is driven to push the soluble bridge plug through the connecting adapter, the soluble bridge plug is set in the test sleeve, the plug is arranged in the center hole of the soluble bridge plug, the test sleeve is arranged in the outer cylinder component, and the pressing joint is connected.

The liquid injection control subsystem controls the liquid injection subsystem to inject the simulation solution into the first cavity through the high-pressure hose until the first cavity is full and the injection is finished after the exhaust. The simulation solution can be configured according to the underground liquid of the area to be simulated or can be directly used for obtaining the underground liquid. A simulated solution of a certain mineralization degree can be marked based on industry, for example, a KCl solution with a mass fraction of 1%; the KCl solution with specified mass fraction can also be prepared by clean water or according to the requirement.

Step S102: and pressurizing the simulation solution in the first cavity to a set first test pressure according to preset pressurizing parameters, entering a pressure stabilizing process and continuously setting a first pressure stabilizing time period.

When the simulation solution is pressurized, the simulation solution can be pressurized to a set first test pressure at one time, or can be pressurized to the first test pressure after being pressurized in a plurality of stages, when the simulation solution is pressurized in a plurality of stages, the liquid in the first cavity is pressurized in a step mode according to preset pressure step intervals, each step pressurizing process comprises a step-up stage and a step-down stage, the pressure is increased by one pressure step in each step-up stage, and each step-down stage lasts for a set third pressure-stabilizing period until the liquid in the first cavity is increased to the set first test pressure. Parameters such as the pressure step interval, the time length of the pressure boosting and the pressure stabilizing can be set according to specific test requirements.

Step S103: and acquiring pressure change data of the soluble bridge plug, and determining the pressure bearing and sealing performance of the soluble bridge plug.

The control operation module in the hydraulic control subsystem can collect pressure change data of the soluble bridge plug from the beginning of setting anchoring to each stage after pressurization and pressure stabilization, and can know whether the pressure bearing and sealing performance of the soluble bridge plug are good or not according to the pressure change data, for example, the bridge plug moves in a direction away from a pressurizing joint after pressurization or the pressure change of two ends of the bridge plug is obvious, and the pressure bearing or sealing performance of the soluble bridge plug is possibly poor. The acquired related data can be displayed in a curve form, so that the comparison is convenient to view.

In the embodiment, in order to test and examine the setting anchoring and sealing performance of the soluble bridge plug, a test sleeve with the soluble bridge plug is installed and examined, one end of the test sleeve is connected with a left end cover and a pressing joint, and the other end of the test sleeve is provided with a filter screen, and then the end cover of the sleeve is screwed; and then the test pieces are put into an outer cylinder of the test device together, and the connecting threads are screwed and checked. And then connecting a high-pressure hose and a connector of the hydraulic injection control pressure subsystem with the pressurizing connector, starting the hydraulic injection control pressure subsystem to work, injecting a simulated solution with a certain mineralization degree into a first cavity at the upper end of the soluble bridge plug in the test sleeve, continuously pressurizing by a booster pump of the hydraulic injection control pressure subsystem after confirming filling and exhausting, pressurizing at 10MPa steps every interval, stabilizing the pressure for 5 minutes by each pressure step, continuously pressurizing to set pressure, such as 70MPa or 50MPa, under the condition that the soluble bridge plug does not slip or has obvious pressure drop in the pressure-increasing or pressure-stabilizing process of each step, determining the set maximum pressure value according to the designed pressure-bearing grade of the soluble bridge plug, stabilizing the pressure for 30 minutes, and judging the setting anchoring and sealing performance of the soluble bridge plug according to the recorded pressure curve and the test process.

The method for simulating the performance of the soluble bridge plug can automatically control various testing environment parameters of the performance test of the soluble bridge plug, automatically analyze and process after obtaining the testing data, automatically adjust the working state of a testing system so as to better simulate the real testing environment, obtain the testing data which are more in line with the real use condition, optimize the performance testing process of the soluble bridge plug, and have mature process, perfect functions, automation and visualization, and further improve the controllability of the testing process.

Example two

The embodiment of the invention provides a method for simulating and testing the performance of a soluble bridge plug, taking the setting and pressure-bearing performance of the soluble bridge plug under set normal temperature as an example, the flow is shown in figure 5, and the method comprises the following steps:

Step S201: and sealing the soluble bridge plug and the plug in the test sleeve assembly, and filling the first cavity and the second cavity with the simulation solution.

Preparing a soluble bridge plug and a test sleeve with certain size and specification to be tested and a connecting adapter matched with the soluble bridge plug and the test sleeve, and debugging a ground hydraulic setting tool. The soluble bridge plug, the adapter and the hydraulic setting tool are connected in sequence and placed horizontally in the test sleeve. The oil pump for setting drives the piston cylinder of the hydraulic setting tool, acts on the bridge plug push ring through the adapter, sets the soluble bridge plug in the test sleeve, and completes the bridge plug setting process. The oil pump is provided with a display for displaying the change of the lost hand force during setting, and the states of the releasing thread, the slips and the rubber cylinder of the bridge plug are inspected to judge the setting effect of the bridge plug, and relevant data such as the lost hand force, the setting performance and the like are recorded.

After setting is completed, a plug is arranged in a center hole of a soluble bridge plug in the test sleeve; and integrally installing the test sleeve into the outer barrel assembly, and connecting the test sleeve with the pressing joint.

The liquid injection control subsystem controls the liquid injection subsystem to inject the simulation solution into the first cavity through the high-pressure hose until the first cavity is filled with the simulation solution and exhausted, and in addition, controls the liquid injection subsystem to inject the simulation solution into the second cavity through the water inlet ball valve on the outer cylinder until the second cavity is filled with the simulation solution and exhausted, and then the injection is finished.

Step S202: and pressurizing the simulation solution in the first cavity to a set second test pressure according to a preset pressurizing parameter, and heating the liquids in the first cavity and the second cavity to a set test temperature according to a preset temperature control parameter.

In order to test the pressure-bearing and sealing performance of the soluble bridge plug at a certain temperature and a certain pressure, the pressure is controlled by the injection and control pressure subsystem, and the temperature is controlled by the induction heating subsystem, so that the use environment of a certain pressure and a certain temperature is simulated.

When the simulation solution is pressurized, the simulation solution can be pressurized to a set second test pressure at one time, or the simulation solution can be pressurized to the second test pressure after being pressurized in a plurality of stages, when the simulation solution is pressurized in a plurality of stages, the liquid in the first cavity is pressurized in a step mode according to preset pressure step intervals, each step pressurizing process comprises a step-up stage and a step-down stage, the pressure is increased by one pressure step in each step-up stage, and each step-down stage lasts for a set fourth step-down period until the liquid in the first cavity is increased to the set second test pressure. The second test pressure may be the same as the first test temperature or different from the first test temperature, and in actual use, a plurality of first test pressures and a plurality of second test pressures may be set to test the performance of the soluble bridge plug under different pressures.

For the test temperature, the heating condition of the device can be controlled through induction coil heating, the device is heated to the required temperature and maintained, and the surface of the outer cylinder and the temperature of the induction coil can be monitored in real time, so that the heating process can be controlled better.

Optionally, the liquid in the second cavity is selectively pressurized or not pressurized according to different test temperatures, and can be selectively pressurized to different pressures according to different temperatures to obtain a better test effect, that is, a third test pressure of the second cavity can be set according to the set test temperature, and the simulation solution in the second cavity is pressurized to the set third test pressure; typically the third test pressure is less than the first test pressure and less than the second test pressure.

Step S203: and at the set test temperature, the voltage stabilizing process continues for the set second voltage stabilizing period.

The pressure stabilizing process generally means that after the pressure is added to the preset pressure, the pressure is not pressurized and is in a maintaining state. The maintenance of pressure can be checked during this process.

Step S204: and acquiring pressure change data of the soluble bridge plug, and determining the pressure bearing and sealing performance of the soluble bridge plug at a set test temperature.

The control operation module in the hydraulic control subsystem can collect temperature data and pressure change data of the soluble bridge plug from the beginning of setting anchoring to each stage after pressurization and pressure stabilization, and can know whether the pressure bearing and sealing performance of the soluble bridge plug is good or not according to the pressure change data. The acquired related data can be displayed in a curve form, so that the comparison is convenient to view.

In the embodiment, the sealing pressure-bearing performance of the soluble bridge plug under certain temperature and pressure conditions is further simulated and tested; the test cannula and the solution at the two ends of the soluble bridge plug are heated to ensure that the bridge plug is stabilized in a constant pressure and at a certain temperature. Therefore, when or after the simulated solution is injected into the first cavity, the water inlet ball valve above the right end cover is opened, the electric constant pressure pump is started, the simulated solution with a certain mineralization degree in the solution tank is pumped into the second cavity of the outer cylinder, and after the simulated solution is confirmed to be full and exhausted, the water inlet ball valve is closed, and the pump is stopped. At the moment, the upper end of the soluble bridge plug is pressurized by setting the hydraulic injection control pressure subsystem, and the pressurization is stopped after the pressure is increased to 20 MPa. Setting the control temperature of the induction heating subsystem by referring to the actual temperature range at the bottom of the well; the induction heating subsystem is then activated to begin induction heating of the outer barrel. Along with the continuous rise of the temperature of the solution in the outer cylinder and the cavity thereof, the test sleeve and the solution in the test sleeve are correspondingly conducted with heat; thus, the pressure at the upper end of the soluble bridge plug will also increase with increasing temperature. Until the temperature measured by the temperature sensor extending into the cavity at the right side of the outer cylinder reaches a temperature set value. The heating temperature of the test system is controlled, on one hand, the highest temperature of the electromagnetic induction heating of the outer cylinder is controlled by the set temperature of the induction heating subsystem to be limited, and meanwhile, the pressure of the cavity in the outer cylinder is also controlled by the pressure value, and the pressure value is regulated by the overflow safety valve, so that the solution in the cavity can be heated to the specified temperature. For example: if the final heating temperature of the solution is set to 120 ℃, the overflow pressure of the overflow safety valve is regulated to be 0.2MPa, and the pressure in the cavity of the outer cylinder is ensured to be constant pressure of 0.2MPa; if the final heating temperature of the solution is 150 ℃, the overflow pressure of the overflow safety valve is regulated to be 0.5MPa, and the pressure in the cavity of the outer cylinder is ensured to be constant pressure of 0.5MPa. When the pressure at the upper end of the bridge plug tends to be stable, the upper end of the soluble bridge plug is pressurized to a set pressure, such as 70MPa; at this point, the test pressure-temperature-time curve is collected and recorded; so as to verify the effective pressure stabilizing time and sealing pressure-bearing performance of the soluble bridge plug.

Example III

The embodiment of the invention provides a method for simulating and testing the performance of a soluble bridge plug, taking the test of the dissolution performance of the soluble bridge plug as an example, the flow is shown in figure 6, and the method comprises the following steps:

Step S301: the soluble bridge plug is sealed in the test sleeve so that the first cavity and the second cavity are communicated.

Taking out the inner plug of the test sleeve assembly based on the first embodiment and the second embodiment, and sealing the soluble bridge plug in the test sleeve assembly; or directly enclose a soluble bridge plug within the test cannula.

After the soluble bridge plug is subjected to setting and pressure-bearing tests, heating and pressurizing are stopped, after the pressure and the temperature are reduced to a safe range, the pressurizing connector is disassembled, the plug in the central hole of the soluble bridge plug is removed, the pressurizing connector is reinstalled, and the soluble bridge plug body is placed in a test sleeve with one end closed.

Step S302: and testing the dissolution performance of the soluble bridge plug in the simulated solution according to a preset dissolution test flow.

The dissolution test of the soluble bridge plug also requires the injection of a simulation liquid, and the simulation solution can be injected from the pressurizing connector of the first cavity and/or the water inlet ball valve of the second cavity because the first cavity and the second cavity are communicated after the plug is removed.

The dissolution test may be performed in one or more stages, i.e. one injection of the simulated liquid until the soluble bridge plug dissolves to a desired level, and the temperature may be controlled to a predetermined dissolution temperature during the soaking process. Or injecting the simulation solution, controlling the temperature to rise, discharging liquid after a certain time, then injecting the simulation solution again, controlling the temperature to rise, discharging liquid after a certain time, and repeating the process for a plurality of times until the soluble bridge plug is dissolved to meet the requirement.

At least one stage of dissolution test is performed on the soluble bridge plug until the dissolution residual of the soluble bridge plug meets the set requirements, each stage of dissolution test comprising: injecting a simulation solution into the first cavity and/or the second cavity, heating the simulation solution to a set dissolution temperature, waiting for a set first dissolution time period, and discharging well fluid in the cavity; the dissolution of the soluble bridge plug at each stage is obtained, and the dissolution performance of the soluble bridge plug is determined.

In the embodiment, the dissolution performance of the soluble bridge plug under a certain temperature and mineralization component is further simulated and tested, and after the sealing pressure bearing performance test is completed, the injection hydraulic control subsystem, the induction heating subsystem, the injection hydraulic subsystem and the like are shut down, so that the pressure relief and the temperature reduction are carried out on the whole test system; after ensuring safety, the pressurizing connector is disassembled, the plug is taken out, after the upper end channel and the lower end channel of the soluble bridge are established, the pressurizing connector is reinstalled, and the left end of the test sleeve is plugged. The solution with certain mineralization degree is prepared in the solution tank of the liquid injection subsystem according to the requirement, then the solution compensation system is started, the inner cavities such as the outer cylinder of the test device and the test sleeve are filled with the solution, the induction heating system is further started, the dissolution temperature is set, and after the temperature is stable, the dissolution starting time is recorded.

Repeating the steps (cooling, discharging the solution in the test device) every time a set time length, such as 24 hours or 48 hours, and checking and recording the dissolution of the soluble bridge plug in the test cannula; then re-injecting liquid, heating and continuing to dissolve. And stopping the dissolution test until the soluble bridge plug body is separated from the test sleeve and the dissolution residue of the soluble bridge plug body meets the relevant requirements of the industry standard, and recording the total dissolution time. The dissolved residue taken from the test cannula is weighed and the dimensions are measured after draining (drying).

In the first, second and third embodiments, the composition of the simulation solution used is determined according to the well fluid in the well bore where the soluble bridge plug is to be used, the first test pressure and the second test pressure are determined according to the well bore ambient pressure where the soluble bridge plug is to be used, and the test temperature and the dissolution temperature are determined according to the well bore ambient temperature where the soluble bridge plug is to be used. In the test, the real use environment of the soluble bridge plug is simulated as much as possible, so when the soluble bridge plug is used for oil wells in different oil storage areas, the liquid in the stratum of the oil storage areas is used as a simulated solution as much as possible during the test, and the mineralization degree is kept consistent.

Based on the same inventive concept, the embodiment of the invention also provides an application of the device or the system for simulating the performance of the soluble bridge plug in the simulation test of the performance of the soluble bridge plug.

Based on the same inventive concept, the embodiment of the invention also provides a method for simulating and testing the performance of the soluble bridge plug, which is realized by using the system for simulating and testing the performance of the soluble bridge plug.

The relevant content in the parts of the device, the system and the method in the embodiment is described in one part, and the other parts are not repeated.

The device, the system and the method provided by the embodiment of the invention can be used for fully simulating the working environments such as different temperatures, pressures, mineralization degrees and the like in the underground operation performance simulation test process of the soluble bridge plug, and testing the comprehensive performances such as setting, bearing, dissolution and the like of the soluble bridge plug in the underground operation process; the pressure and the pressurizing speed are precisely controlled through an automatic pressure control liquid injection subsystem and an induction heating subsystem 3, and the state is timely regulated and locked, and the temperature is precisely controlled and regulated; the device can timely control the heating temperature of the whole test system and the solution temperature in the system, accurately acquire and record the performance parameters and data such as the hand loss force, the setting stroke, the effective temperature resistance and pressure bearing capacity, the effective sealing time, the dissolution time and the like of the soluble bridge plug, and automatically output numerical value change relation curves such as pressure, temperature, time and the like. Finally, the upper part of the soluble bridge plug can be filled with the simulation solution and continuously keeps a stable high-temperature and high-pressure state in the pressure-bearing process, and the lower part of the soluble bridge plug can be always soaked in the environment of the simulation solution and keeps a certain set temperature; meanwhile, an automatic solution compensation system is carried, so that the automatic compensation and circulation functions of the solution in the system in the test process are realized. Thereby simulating the working environment of the soluble bridge plug under the well; the comprehensive performance test of the soluble bridge plug is guaranteed, and the product quality and performance index of the soluble bridge plug are controlled; meanwhile, according to test data and conclusions, the further optimization design of the soluble bridge plug can be better guided, and the research and development of soluble bridge plug series products with different sizes and different temperature and pressure grades can be forcefully promoted.

The test device and the test system have the advantages of more mature process, more perfect function, higher visualization and automation degree and higher intelligent degree; the device can be suitable for performance tests of soluble bridge plugs with different sizes and different casing specifications; the pressure-bearing performance test range is large, the pressure range of 0-200MPa can be tested, the test precision is high, the test pressure control precision can reach 0.1MPa, the temperature resistance test range is large, the temperature range of 0-200 ℃ can be tested, the test precision is high, the temperature control precision can reach 0.1 ℃, the error can be controlled at +/-1 ℃, and the pressure-bearing performance test system is an advanced test system with high precision and automation.

Unless specifically stated otherwise, terms such as processing, computing, calculating, determining, displaying, or the like, may refer to an action and/or process of one or more processing or computing systems, or similar devices, that manipulates and transforms data represented as physical (e.g., electronic) quantities within the processing system's registers or memories into other data similarly represented as physical quantities within the processing system's memories, registers or other such information storage, transmission or display devices. Information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

It should be understood that the specific order or hierarchy of steps in the processes disclosed are examples of exemplary approaches. Based on design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not meant to be limited to the specific order or hierarchy presented.

In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, invention lies in less than all features of a single disclosed embodiment. Thus the following claims are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate preferred embodiment of this invention.

Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. The processor and the storage medium may reside as discrete components in a user terminal.

For a software implementation, the techniques described in this disclosure may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. These software codes may be stored in memory units and executed by processors. The memory unit may be implemented within the processor or external to the processor, in which case it can be communicatively coupled to the processor via various means as is known in the art.

The foregoing description includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, as used in the specification or claims, the term "comprising" is intended to be inclusive in a manner similar to the term "comprising," as interpreted when employed as a transitional word in a claim. Furthermore, any use of the term "or" in the specification of the claims is intended to mean "non-exclusive or".

Claims

1. A soluble bridge plug performance simulation test device, comprising: the outer cylinder assembly, the test sleeve assembly and the pressing joint, wherein the test device comprises a non-assembly state and an assembly state, and the test sleeve assembly comprises the following components in the assembly state:

The test sleeve assembly is positioned in the outer cylinder assembly and comprises a test sleeve and a sleeve end cover, and a supporting block is arranged in the outer cylinder assembly and below the test sleeve assembly;

The outer cylinder assembly comprises an outer cylinder, a left end cover and a right end cover;

The outer cylinder is provided with a middle through hole for accommodating a test sleeve, the test sleeve is provided with a middle through hole for accommodating a soluble bridge plug, the outer end of the test sleeve extends out and is connected with a pressing joint, the inner end of the test sleeve is communicated with the cavity of the outer cylinder, the sleeve end cover is arranged at the inner end of the test sleeve, and the sleeve end cover is provided with a filter screen;

The left end cover is arranged at the left end of the outer cylinder and is provided with a left end cover mounting hole for mounting a test sleeve and a pressurizing connector, so that simulation solution is injected into a first cavity above the soluble bridge plug through the pressurizing connector and is pressurized;

The right end cover is installed in the urceolus right-hand member, is equipped with into water ball valve and play water ball valve to pour into the simulation solution into in the second cavity below the soluble bridging plug, still be equipped with temperature measuring instrument and pressure measuring instrument on the urceolus subassembly, still arranged induction coil on the urceolus wall of urceolus subassembly.

2. The device of claim 1, wherein the sleeve end cap is provided with internal threads by which it is connected to external threads at the inner end of the test sleeve;

3. The apparatus of claim 1, wherein the filter mesh is a dense mesh of stainless steel to filter soluble bridge plug dissolution residue.

4. The device according to claim 1, wherein the left end cover is provided with external threads and is connected with the internal threads of the left end of the outer cylinder; the right end cover is provided with an internal thread and is connected with an external thread at the right end of the outer cylinder; the threaded connection part of the left end cover and the right end cover is provided with a sealing ring;

5. The device according to claim 1, wherein the outer cylinder wall of the outer cylinder is further provided with one or a combination of the following: at least one pressure gauge, at least one temperature sensor, at least one overflow safety valve.

6. The apparatus of claim 1, wherein the support block is of an insulating material having an arcuate support surface that mates with the test sleeve assembly.

7. The apparatus of claim 1, further comprising a support frame;

8. The apparatus of any of claims 1-7, further comprising a coil securing assembly to support the induction coil.

9. A soluble bridge plug performance simulation test system, comprising: a hydraulic control subsystem, a hydraulic injection subsystem and a soluble bridge plug performance simulation test device according to any one of claims 1-8;

the liquid injection control pressure subsystem is used for controlling the liquid injection subsystem to inject the simulation solution into the first cavity and/or the second cavity;

and pressurizing the simulated solution according to a preset test pressure of the soluble bridge plug setting, bearing or dissolution test.

10. The system of claim 9, further comprising an induction heating subsystem for heating the simulated solution based on a preset test temperature for a soluble bridge plug set, pressure or dissolution test.

11. The system of claim 10, wherein the hydraulic injection control subsystem is further configured to obtain pressure change data of the soluble bridge plug during a setting and pressure-bearing test process, and determine pressure-bearing and sealing properties of the soluble bridge plug; or obtaining the dissolution condition of the soluble bridge plug in dissolution test engineering, and determining the dissolution performance of the soluble bridge plug.

12. The system of claim 11, wherein the hydraulic control subsystem comprises a control operation module, a pressure monitoring module, and a high pressure hose;

13. The system of claim 11, wherein the induction heating subsystem comprises a cycle monitoring module, a temperature measurement module, a monitoring control module;

14. The system of claim 9, wherein the priming subsystem comprises at least one solution tank containing a simulation solution, a transfer pump, and a priming line;

15. The system of any of claims 9-14, further comprising a main power supply connecting the hydraulic injection control subsystem and the induction heating subsystem.

16. A method for simulating performance of a soluble bridge plug, based on the device for simulating performance of a soluble bridge plug according to any one of claims 1 to 8, comprising:

17. The method as recited in claim 16, further comprising:

Filling the second cavity with a simulation solution;

18. The method as recited in claim 17, further comprising:

19. The method of claim 17, wherein,

Pressurizing the simulation solution in the first cavity to set a first test pressure according to preset pressurizing parameters, including:

20. The method of any one of claims 16-19, wherein enclosing the dissolvable bridge plug and plug within the test cannula assembly comprises:

21. The method as recited in claim 16, further comprising:

22. The method of claim 21, wherein testing the solubility of the soluble bridge plug in the simulated solution according to a predetermined dissolution test procedure comprises:

23. The method of claim 22, wherein the composition of the simulated solution is determined from a well fluid in a well bore in which the soluble bridge plug is to be used, the first test pressure and the second test pressure are determined from a well bore ambient pressure in which the soluble bridge plug is to be used, and the test temperature and the dissolution temperature are determined from a well bore ambient temperature in which the soluble bridge plug is to be used.

24. Use of a device according to any one of claims 1 to 8 or a system according to any one of claims 9 to 15 in a simulation of the performance of a soluble bridge plug.

25. A method of performance simulation testing of a soluble bridge plug, characterized in that it is carried out using a system of performance simulation testing of a soluble bridge plug according to any one of claims 9-15.