CN114662307A - Monitoring device for high-simulation analogue measurement of cementing strength of well cementation interface - Google Patents

Monitoring device for high-simulation analogue measurement of cementing strength of well cementation interface Download PDF

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CN114662307A
CN114662307A CN202210275656.9A CN202210275656A CN114662307A CN 114662307 A CN114662307 A CN 114662307A CN 202210275656 A CN202210275656 A CN 202210275656A CN 114662307 A CN114662307 A CN 114662307A
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pressure
cement
kettle body
strength
monitoring device
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CN114662307B (en
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王凯
郑明明
王飞
梁永闪
霍宇翔
邱德龙
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Chengdu Univeristy of Technology
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Chengdu Univeristy of Technology
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
    • G06Q10/06395—Quality analysis or management
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/08—Fluids
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/10—Geothermal energy

Abstract

The invention relates to a monitoring device for high-simulation measurement of cementing strength of a well cementation interface, which comprises the following steps: comprises a first measuring pipe and is characterized in that when bubbles with preset size are generated at the pipe orifice of the first measuring pipe, the pressure at the moment is measured as initial demulsification pressure P1(ii) a When at least a single complete bubble is generated at the orifice of the first measuring tube, the pressure at the moment is measured as the final demulsification pressure P2(ii) a When the cement slurry at the pipe orifice of the first measuring pipe fluctuates, vibrates or cracks are generated, the pressure at the moment is measured to be P3And the cement paste gel strength at the corresponding moment is represented according to the cement paste gel strength. Also comprises a second measuring tubeAnd further simulating and measuring the cementing strength between the cement slurry and the casing pipe under the corresponding ground temperature and ground pressure in oil-gas well cementation.

Description

Monitoring device for high-simulation analogue measurement of cementing strength of well cementation interface
Description of the cases
The original basis of the divisional application is a patent application with the application number of 202111502760.9, the application date of 2021, 12 months and 10 days, and the invention is named as 'a cement slurry coagulation quality evaluation device and evaluation method for engineering grouting'.
Technical Field
The invention relates to the technical field of cement slurry coagulation quality monitoring, in particular to a monitoring device for high-simulation measurement of cementing strength of a well cementation-interface.
Background
The engineering grouting is a method for improving the physical and mechanical properties of the rock-soil foundation by injecting certain curable grout prepared according to a certain proportion into cracks or pores of the rock-soil foundation by a proper method and through replacement, filling, extrusion and other modes. The grouting technology can be used for secondary cement slurry injection of pile cables of walls in ground disasters, post-pile grouting in the underground engineering construction process, seepage-proofing grouting in the subway tunnel construction process, secondary grouting between a cement sheath and a stratum after well cementation and the like. In a plurality of construction works related to grouting process, the coagulation quality after cement paste pouring is the most concerned index for engineering personnel, and the coagulation quality closely influences the strength performance of each building structure.
For example, in the case of the exploitation of conventional oil and gas and unconventional oil and gas (such as combustible ice, shale oil and the like), in order to ensure stable and long-term exploitation of oil and gas resources, well cementing operation needs to be performed on a drilled stratum, and the well cementing operation has important significance in the aspects of improving the stability of a well wall, preventing interbedded channeling, establishing an oil and gas outflow channel, performing stimulation measures and the like. The cementing strength of the cement slurry after well cementation has important influence on maintaining the stability of a well wall, preventing gas channeling, preventing interlayer channeling and the like. In addition, in the engineering grouting fields such as secondary cement grouting of ground disaster inner wall pile cables, post-pile grouting in the underground engineering construction process, seepage-proofing grouting in the subway tunnel construction process and the like, the strength of cement paste has important influence on the stability of corresponding engineering structures. The existing indoor cement gel strength testing method is simple and easy to implement, but still has the following problems: (1) the simulative stratum environment is limited, and particularly, a simulation method for in-situ stratum and low temperature is lacked, so that the data in the experiment process is not comprehensive enough, certain persuasion is lacked, and practical guide basis cannot be accurately and effectively provided for site construction; (2) the experimental process is usually invisible, so that the strength value of the cement paste is often inaccurate only by means of reading of an instrument, and the microcosmic state change of the cement paste in each setting period is ignored, so that the final evaluation of the setting quality of the cement paste is inaccurate; (3) almost no real-time measuring device exists, most of the devices can only obtain the final evaluation result of the cement paste setting strength, and cannot detect the corresponding gel strength and the change strength thereof at any hydration moment of the cement paste.
Therefore, the invention provides a visual and high-simulation method and device for measuring the gel strength development in the cement slurry setting and hardening process in real time so as to simulate various environment states in the underground space construction process, thereby providing good data support for the underground space construction.
Furthermore, on the one hand, due to the differences in understanding to the person skilled in the art; on the other hand, since the applicant has studied a great deal of literature and patents when making the present invention, but the disclosure is not limited thereto and the details and contents thereof are not listed in detail, it is by no means the present invention has these prior art features, but the present invention has all the features of the prior art, and the applicant reserves the right to increase the related prior art in the background.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a cement slurry coagulation quality evaluation device and an evaluation method for engineering grouting, and aims to solve at least one or more technical problems in the prior art.
In order to achieve the above object, the present invention provides a cement slurry coagulation quality evaluation device for engineering grouting, at least comprising: a sealing kettle body which is provided with a pressure cavity for containing cement slurry, wherein the top and the side of the pressure cavity are connected with pressure chambers, the pressure chamber at the top can simulate the pressure state of the cement slurry at different depths of different layers, and the pressure chamber at the side can simulate the pressure state of various stratum fluids invading the cement slurry, a heating unit which is used for providing heat energy for simulating the temperature state of the cement slurry at different depths of different layers for the sealing kettle body, wherein, the pressure chamber at the top of the sealing kettle body is communicated with an input pipeline for injecting pressurized fluid into the pressure chamber, and the side of the sealing kettle body is connected with a plurality of input pipelines, wherein, at least one input pipeline extending into the cement slurry is configured as a first measuring pipe, at least another input pipeline extending into the pressure chamber at the side of the sealing kettle body is configured as a second measuring pipe, wherein, at least part of the sealing kettle body is configured as a first window and a second window which can be seen, and the respective ends of the first and second tubes are within the visible range of the first and second windows.
Preferably, the first measuring pipe is configured as a detachable structure, and when the first measuring pipe is a transparent pipe, the first measuring pipe is parallel to or perpendicular to the inner wall of the first window according to a preset gap.
Preferably, a pressurized fluid pump unit is connected to the top of the pressure cavity of the sealing kettle body and is used for providing power for applying pressurized fluid to the cement slurry so as to simulate the pressure state of the cement slurry under the corresponding stratum, wherein the pressurized fluid pump unit is provided with a buffer tank for stabilizing the pressure of the fluid.
Preferably, at least one layer of isolation layer is arranged between the pressure cavity of the sealing kettle body and the pressure chamber at the top of the sealing kettle body.
Preferably, a flow meter and a pressurizing pump are arranged above each input pipeline for injecting pressurized fluid into the sealing kettle body, and each input pipeline is in mechanical and/or circuit communication with a controller.
Preferably, the pressurized fluid is injected into a pressure chamber located above the insulation layer, and the pressurized fluid is a liquid that is immiscible with the cement slurry.
Preferably, the device also comprises a base and movable supports arranged at two ends of the top of the base, and the sealing kettle body and the heating unit are connected to the movable supports so as to provide heat energy for the sealing kettle body in a mode of lifting the heating unit.
Preferably, the determination of the cement slurry gel strength by the evaluation device is performed as follows:
s101: according to the detection requirement, controlling a pressurized fluid pump unit and a heating unit to apply pressure and temperature states corresponding to different depths of the stratum to a pressure cavity containing cement paste of the sealing attachment;
s102: when the cement paste setting and hardening reaction reaches a preset time, starting a fluid conveying device to apply pressurized fluid to the first measuring pipe;
s103: and observing the microscopic change of the cement paste at the orifice of the first measuring pipe through the first window, and recording the pressure value P at the corresponding moment through the pressure gauge.
Preferably, before the initial setting of the cement paste, when bubbles with a preset size are generated at the orifice of the first measuring pipe, the pressure at the moment is measured as the initial demulsification pressure P1When at least a single complete bubble is generated at the orifice of the first measuring pipe, the pressure at the moment is measured as the final demulsification pressure P2The cement paste has the gel strength of the initial demulsification pressure P at the moment1With final emulsion breaking pressure P2The sum and a scaling factor K, wherein the scaling factor K is 0.5.
Preferably, at the initial setting of the cement paste, when the cement paste at the pipe orifice of the first measuring pipe fluctuates, vibrates or fractures are generated, the pressure at the moment is measured to be P3And the cement paste gel strength at the corresponding moment is represented according to the cement paste gel strength.
Preferably, when the gel strength of the cement paste is measured in a simulated manner, if bubbles are formed and float upward or cracks are generated at the pipe orifice of the first measuring pipe, a pressure value P corresponding to the fluctuation of the flow rate of the fluid displayed in real time by the flow rate detecting device is obtained, and the gel strength of the cement paste is represented according to the pressure value P.
Preferably, the invention also provides a construction method of the cement paste for engineering grouting, which can comprise the following steps: measuring pressure values P corresponding to the preset forms and used for representing the cement paste gel strength at least partial hydration time by observing the microscopic forms of the cement paste; obtaining a function curve of correlation between cement paste gel strength and hydration time based on regression analysis results of a plurality of pressure values P; and estimating the cement paste gel strength at least another part of hydration time according to the function curve, and controlling the addition and the dosage of the accelerator according to the estimated cement paste gel strength.
The beneficial technical effects of the invention are as follows: the change condition of the cement paste in the setting and hardening process can be visually observed through a visual window; secondly, the cement paste can be coagulated and hardened under the conditions of corresponding ground temperature and ground pressure by referring to the ground temperature and ground pressure of a corresponding stratum of a construction site, the gel strength of the cement paste can be measured at any hydration time, and a change curve of the gel strength along with time can be obtained. In addition, if the requirement of measuring the cementing strength of a well cementation-interface exists, the cementing strength can be measured after cement slurry is hardened and cementing is generated between the cement slurry and the inner wall of the cylinder body; in addition, before construction of a difficult stratum on site, a ground test can be carried out, cement paste is placed under the ground temperature and the ground pressure of a corresponding stratum, the cement paste is coagulated and hardened, whether the cement paste meets the requirements of corresponding projects on strength or not is checked, and cost increase and construction period delay caused by misoperation can be greatly reduced; moreover, the device can be widely applied to construction engineering of future underground space, namely can be used for simulating the condition of cement gel strength development of the underground space building in the construction process, thereby greatly reducing the construction cost of the future underground space.
Drawings
FIG. 1 is a schematic structural diagram of a preferred device for evaluating the coagulation quality of a cement slurry for engineering grouting according to an embodiment of the invention;
FIG. 2 is an enlarged view of a portion of a first window according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a preferred structure of a first probe in a first window according to an embodiment of the invention;
FIG. 4 is a close-up view of a second window according to an embodiment of the present invention;
FIG. 5 is a flow chart of a preferred method of evaluating devices according to embodiments of the present invention;
FIG. 6 shows the cement mortar setting strength with time under the pressure condition of 5MPa of engineering grouting.
List of reference numerals
10: a base; 20: a movable support; 30: sealing the kettle body; 40: a heating unit; 50: an isolation layer; 60: a buffer device; 70: a flow detection device; 80: a fluid delivery device; 90: a controller; 100: a pressure gauge; 110: a first window; 120: a second window; 130: a first measuring tube; 140: a second measuring tube; 200: a pressurized fluid; 300: cement slurry; 400: sealing the kettle body interface; 500: cementing an interface.
Detailed Description
The following detailed description is made with reference to the accompanying drawings.
According to a preferred embodiment, the invention provides a cement slurry coagulation quality evaluation device for engineering grouting, which can be widely applied to a plurality of fields related to underground space cement slurry gel strength detection, including but not limited to secondary grouting between a cement sheath and a stratum after oil and gas well cementation, a concrete cast-in-place pile in industrial and civil buildings and the like.
Specifically, as shown in fig. 1, the evaluation device of the present invention may include:
a base 10;
a movable stand 20 disposed on top of the base 10 and including two independent stands opposite to each other;
the sealing kettle body 30 is used for accommodating cement paste to be tested, the sealing kettle body 30 is arranged at the top of the base 10 in a non-contact mode, and two ends of the sealing kettle body 30 are connected to the movable support 20;
and a heating unit 40 for supplying heat energy to the sealing pot body 30, which is disposed between the sealing pot body 30 and the base 10, and both sides of which are connected to the movable bracket 20.
According to a preferred embodiment, when it is required to supply the temperature of the corresponding formation to the sealing pot body 30, the heating unit 40 may be lifted to a desired position by the movable support 20 to heat the sealing pot body 30.
In particular, to simulate an environment in which the formation temperature ranges from near zero to several hundred degrees Celsius, the heating unit 40 preferably employs a water-oil bath or a sand bath to provide a high temperature environment above several hundred degrees Celsius.
According to a preferred embodiment, the sealing kettle 30 has a pressure chamber (not shown) for receiving the cement slurry 300 to be tested.
According to a preferred embodiment shown in fig. 1, a first pressure chamber is arranged above the pressure chamber of the sealing kettle body 30, and an external acting force in the vertical direction can be applied to the cement slurry 300 through the first pressure chamber so as to simulate the pressure state of the cement slurry 300 at different depths of a stratum. Therefore, as shown in fig. 1, a pressurized fluid pump unit with a buffer device 60 is added to the upper portion of the pressure chamber of the sealing kettle 30, and under the action of the fluid pump unit, pressurized fluid 200 is injected into the first pressure chamber above the cement slurry 300 to provide the cement slurry 300 with the pressure state of the corresponding formation. Preferably, the buffer device 60 is a buffer tank for stabilizing the pressure of the fluid to smoothly and slowly press the fluid into the sealing pot 30.
Further, a second pressure chamber (not shown) is provided at a side of the pressure chamber of the sealing autoclave body 30, and an external force in a lateral direction can be applied to the cement slurry 300 through the second pressure chamber, so as to simulate a pressure state corresponding to invasion of formation fluids at different depths into the cement slurry 300 or a cementing cement sheath. Preferably, like the first pressure chamber, the second pressure chamber provides the cement slurry 300 with a corresponding pressure state for the formation fluid to soak in, also by injecting the pressurized fluid 200.
According to a preferred embodiment shown in fig. 1, a first window 110 is provided at a substantially central position of the sealing pot body 30 and a second window 120 is provided at a side thereof, i.e., where external fluid intrusion is simulated. Preferably, in order to facilitate clear observation of microscopic changes of the cement slurry 300 inside the pressure chamber and microscopic changes of the cement slurry 300 upon invasion of external fluid, the first window 110 and the second window 120 are configured to have a magnifying effect (for example, the corresponding glass windows are configured in a magnifying glass form), and scale marks are provided on both the first window 110 and the second window 120, so that an experimenter can observe changes of internal fluid bubbles through the visualization windows and record corresponding data.
According to a preferred embodiment shown in fig. 1, an isolation layer 50 is disposed on the top of the pressure chamber of the sealing kettle 30, and is used for isolating the pressurized fluid 200 above the isolation layer from the cement slurry 300 inside the pressure chamber. Preferably, the pressurized fluid 200 injected into the first pressure chamber is a liquid immiscible with the cement slurry 300.
According to a preferred embodiment shown in fig. 1, a plurality of input pipelines are connected to the side surface of the sealing kettle body 30. Preferably, each input pipeline is provided with a valve for controlling the on-off of the pipeline.
According to a preferred embodiment shown in fig. 1, an input end of an input pipeline extends into the cement slurry 300 in the sealing kettle body 30 from the side of the sealing kettle body 30. For ease of understanding, the at least part of the input line inserted into the cement slurry 300 is defined as the first pipe 130.
According to a preferred embodiment shown in fig. 2, the end of the first tube 130 is within the visible area of the first window 110. Further, as shown in fig. 3, when the first measuring tube 130 is a transparent glass tube, it is required to be parallel or perpendicular to the wall surface of the first window 110 with a certain gap (e.g., about 1 mm). Preferably, the first measuring tube 130 for measuring the cement slurry 300 is configured as a detachable structure, and the fluid (gas or liquid) inputted through the input end can be selected according to specific situations. In addition, if the first pipe 130 is in a transparent form, it is possible to observe whether the cement paste 300 invades back into the input line.
According to a preferred embodiment shown in fig. 1, the input pipeline where the first measuring tube 130 is located is provided with two branch pipelines, and the two branch pipelines are connected to the side surface of the sealing kettle body 30 and both extend into the second pressure chamber on the side surface of the sealing kettle body 30. For ease of understanding, at least the portion of the branch input line that is within the second window 120 will be referred to as the second tube 140.
According to a preferred embodiment shown in fig. 4, the end of the second measuring tube 140 is located within the visible area of the second window 120, and in particular, the end of the second measuring tube 140 is located between the sealing pot interface 400 of the sealing pot 30 and the pressure chamber.
According to a preferred embodiment shown in fig. 1, the various input lines for delivering pressurized fluid 200 are mechanically and/or electrically connected to controller 90. Preferably, the controller 90 is an integrated intelligent control unit, which is used for controlling the start and stop of each device on the conveying pipeline and adjusting the working mode or state of each device.
According to a preferred embodiment shown in fig. 1, the device further comprises a flow detection device 70, a fluid delivery device 80 and a pressure gauge 100 arranged on each input line.
According to a preferred embodiment, the flow sensing device 70 is a flow meter that measures the flow rate of the fluid and the gel strength of the cement slurry 300 can be determined from real-time readings of the flow sensing device 70 with high accuracy.
Specifically, in the initial stage of pressurization, as the pressure in the pipeline rises, the flow rate of the fluid displayed in real time by the flow rate detection device 70 is relatively uniform, when bubbles are formed and float up or cracks are generated at the orifice of the pressurization pipe, the pressure in the pipeline is necessarily slightly fluctuated, while the flow rate of the fluid displayed in real time by the flow rate detection device 70 is necessarily fluctuated, and the pressure corresponding to the moment of fluctuation is defined as the gel strength of the cement slurry 300.
According to a preferred embodiment, the fluid delivery device 80 is a pressurizing pump for pumping the pressurized fluid 200 into the sealing pot 30.
According to a preferred embodiment, the pressure gauge 100 is used to read the pressure value of the pressurized fluid 200 in real time, and the pressure gauge 100 has a high accuracy, which ensures a true reliability of the data throughout the simulation test.
According to a preferred embodiment, when the device for evaluating the setting quality of the cement paste for construction grouting of the invention is used, the cement slurry 300 to be measured is accommodated in the pressure cavity of the sealing kettle body 30 to carry out the setting and hardening reaction, according to the detection requirement, the pressurized fluid 200 is injected into the first pressure chamber above the pressure cavity through the pressurized fluid pump unit to provide the pressure cavity containing the cement slurry 300 with the pressure state of the corresponding stratum, and the temperature state of the corresponding formation is provided to the pressure chamber containing the cement slurry 300 through the heating unit 40, and after the measurement is started, after the cement slurry setting and hardening reaction is performed for a certain set time, the fluid delivery device 80 is activated to smoothly and slowly deliver the pressurized fluid 200 into the cement slurry 300 through the first measuring tube 130, and observing the microscopic change of the cement slurry 300 at the orifice of the first measuring pipe 130 through the first window 110, and recording the pressure value P at the same time: before the cement slurry 300 is initially set, the cement slurry 300 will generate a certain size of bubbles (e.g. about 1 mm) at the first window 110 due to the fluid pressure, and the pressure at this time is the initial demulsification pressure P1As the input pressure continues to increase, the cement slurry 300 will generate complete bubbles, and the pressure at this point is measured as the final demulsification pressure P2Finally, the gel strength of the cement slurry 300 at the moment is obtained as the initial demulsification pressure P1With final emulsion breaking pressure P2The sum multiplied by a scaling factor K, and K is preferably 0.5; when the cement slurry 300 is initially set, the cement slurry 300 is gradually condensed into a paste, the gel strength at this time is the pressure value reflected by the pressure gauge when the cement slurry at the pipe orifice of the first measuring pipe 130 fluctuates, vibrates or cracks are generated, and the gel strength of the cement slurry 300 at this time is measured to be P3。
In particular, when there is a need to further simulate the detection requirement for measuring the cement strength between the cement slurry 300 and the casing in oil and gas cementing at the corresponding ground temperature and pressure, i.e. the cementing-interface 500 cement strength: and (3) enabling the cement paste 300 to continue to generate a setting and hardening reaction, opening the second measuring tube 140 after reaching the preset time, continuously pumping the stable and slow fluid to a gap between the cement sheath and the inner wall of the sealing kettle body 30, observing through the second window 120 on the side surface of the sealing kettle body 30, stopping pumping the fluid and recording the pumping pressure when the looseness is observed between the cement sheath and the inner wall of the kettle body, wherein the pumping pressure is the cementing strength between the cement sheath and the steel sleeve, and the pumping pressure is in positive correlation with the cementing strength between the cement sheath and the well wall.
According to a preferred embodiment, as shown in fig. 6, the measured results are subjected to regression analysis to obtain a curve of the cement mortar setting strength under the condition of the pressure of the engineering grouting of 5Mpa, and the regression equation after curve fitting is that y is 349.15+0.42exp (x/1.23), R2The correlation coefficient is as high as 0.96, which indicates that the cement paste setting strength has strong correlation with hydration time, and the obtained function can be used for predicting the setting strength at different time points.
Preferably, according to the tested development relationship of the setting strength, the formulated cement paste has better right-angle thickening property, and an accelerator can be added according to the requirement on the curing time in engineering application, so that the rapid development period of the setting strength is within the required curing time range, and the engineering requirement can be met.
According to a preferred embodiment, based on the device for evaluating the setting quality of the cement slurry for engineering grouting, the invention provides an evaluation method based on the evaluation device, and as shown in fig. 5, the evaluation method can comprise the following steps:
s101: according to the detection requirement, the pressurized fluid pump unit and the heating unit are controlled to provide variable pressure and temperature conditions for a pressure cavity containing cement slurry 300 of the sealing kettle body, so that the setting and hardening process of the cement slurry 300 is under the temperature and/or pressure state of the corresponding stratum;
s102: after the cement slurry setting and hardening reaction is carried out for a certain set time, the fluid conveying device 80 is started to apply smooth and slow fluid to the first measuring pipe 130 extending into the cement slurry 300;
s103: the microscopic change of the cement slurry 300 at the orifice of the first measuring pipe 130 is observed through the first window 110, and the pressure value P for representing the gel strength of the cement slurry 300 is recorded at the same time, the pressure of the fluid can be obtained on the pressure gauge 100, and the pressure gauge 100 can be installed on the buffer device 60.
Specifically, before the initial setting, due to the pressure at the orifice of the first measuring tube 130, the cement slurry 300 will generate a certain amount of bubbles at the first window 110 (with scale lines), for example, when the size of the bubbles is 1mm, the pressure at this time is the initial demulsification pressure P1As the input pressure continues to increase, the cement slurry 300 will generate complete bubbles, and the pressure at this point is measured as the final demulsification pressure P2Finally, the initial demulsification pressure P is obtained as the capacity of the cement slurry 300 to resist the invasion of external fluid at the moment1With final emulsion breaking pressure P2The sum is multiplied by a scaling factor K, and the product represents the gel strength of the cement slurry 300 at the corresponding moment, wherein the scaling factor K is preferably 0.5; when the cement slurry 300 is initially set, because the cement slurry 300 is coagulated into paste, the gel strength at this time is the pressure value reflected by the pressure gauge or the flow detection device 70 when the cement slurry of the first measuring pipe 130 fluctuates, vibrates or cracks are generated, and the capability of the cement slurry 300 resisting the invasion of external fluid at this time is P3。
Further, if there is a need to simulate the measurement of the bond strength between the cement slurry 300 and the casing at the corresponding ground temperature and pressure, the measurement can be made by:
even if the cement slurry 300 continues to generate a setting and hardening reaction, when the preset time is reached, the second measuring pipe 140 is opened, and the fluid is pumped smoothly and slowly to enter a gap between the cement sheath and the inner wall of the sealing kettle body 30;
with the continuous input of the pressurized fluid 200 in the experimental process, when the looseness between the cement sheath and the inner wall of the kettle body is observed through the second window 120 at the position of the second measuring pipe 140, the pumping of the fluid is stopped, and the pumping pressure at the moment is recorded;
and recording the pumping pressure at the moment to represent the bond strength between the simulated cement sheath and the casing, wherein the pumping pressure is in positive correlation with the bond strength between the cement sheath and the well wall.
In particular, for oil and gas well cementing projects in general, the cementing-interface is the cementing interface between the casing and the cement sheath.
In the prior art, the cement paste gel strength is generally expressed by the viscosity and pressure of the cement paste, while the cement paste viscosity is converted into the cement paste gel strength which is widely used at present, however, the cement paste gel strength obtained by the viscosity conversion is not visual enough. Therefore, the invention adopts a pressure mode to characterize the gel strength of the cement paste, namely the demulsification pressure of the fluid in the cement paste is used for expressing the gel strength of the cement paste.
Therefore, based on the cement slurry condensation quality evaluation device for engineering grouting, when the device is applied to the simulation measurement of the cement slurry gel strength in multiple fields such as secondary grouting of underground disaster wall pile cables, post-pile grouting in the underground engineering construction process, seepage-proofing grouting in the subway tunnel construction process or secondary grouting between a cement sheath and a stratum after well cementation and the like, the device can simulate the stratum environment near each engineering section in advance, namely simulate the temperature and the pressure of the stratum where the device is located. In order to meet the requirements of the corresponding protective structure on the cement paste gel strength, the gel strength of the cement paste corresponding to the temperature and pressure conditions of each stratum obtained through experimental simulation can be compared with a theoretical value, so that various parameters in the actual cement construction process can be adjusted based on experimental data, such as the proportion, the temperature, the pouring flow and the like of the cement paste.
In other words, reliable data support can be well provided for the development of various concrete or cement construction projects through experimental simulation in advance, and particularly for cement paste gel strength, in most construction links related to cement processes, engineering personnel can effectively adjust process parameters related to the cement paste gel strength according to experimental data so that the strength performance of each building structure meets corresponding engineering requirements.
It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents. The present description contains several inventive concepts, such as "preferably", "according to a preferred embodiment" or "optionally", each indicating that the respective paragraph discloses a separate concept, the applicant reserves the right to submit divisional applications according to each inventive concept.

Claims (10)

1. A monitoring device for high-simulation measurement of cementing strength of a well cementation interface comprises:
a first measuring pipe (130), a plurality of input pipelines are connected with the side surface of the sealing kettle body (30), wherein at least one input pipeline extending into cement paste is configured as the first measuring pipe (130),
it is characterized in that the preparation method is characterized in that,
the first measuring pipe (130) is provided with a structure capable of observing the microscopic change of cement paste at the pipe orifice, and a pressure value P at the corresponding moment is recorded through a pressure gauge (100);
when bubbles with preset size are generated at the orifice of the first measuring tube (130), the pressure at the moment is measured as the initial demulsification pressure P1(ii) a When at least a single complete bubble is generated at the orifice of the first measuring tube (130), the pressure at the moment is measured as the final demulsification pressure P2(ii) a When the cement slurry at the pipe orifice of the first measuring pipe (130) fluctuates, vibrates or fractures are generated, the pressure at the moment is measured to be P3And the cement paste gel strength at the corresponding moment is represented according to the cement paste gel strength.
2. The monitoring device for high-simulation measurement of cement bond strength of well cementation-interface as claimed in claim 1, characterized in that the pressure chamber at the top of the sealing kettle body (30) is communicated with an input line for injecting pressurized fluid into the pressure chamber.
3. The monitoring device for high-simulation measurement of cementing strength of a well cementation-interface as claimed in claim 2, wherein a pressurized fluid pump unit is connected to the top of the pressure cavity of the sealing kettle body (30) and is used for providing power for applying the pressurized fluid to the cement slurry so as to simulate the pressure state of the cement slurry under the corresponding stratum.
4. The monitoring device for high-simulation measurement of cementing strength of a well cementation-interface according to claim 3, characterized in that a heating unit (40) is capable of providing the sealing kettle body (30) with thermal energy for simulating the temperature state of the cement slurry at different depths of stratum.
5. The monitoring device for high-simulation measurement of cementing strength of a well cementation-interface according to claim 4, characterized in that at least one isolation layer (50) is arranged between the pressure chamber of the sealing kettle body (30) and the pressure chamber at the top of the sealing kettle body.
6. The monitoring device for measuring the cementing strength of a well cementation-interface through high simulation as claimed in claim 5, characterized in that the sealing kettle body (30) and the heating unit (40) are connected to a movable bracket (20) so as to provide heat energy to the sealing kettle body (30) by lifting the heating unit (40).
7. A monitoring device for high-simulation measurement of cementing strength of a well cementation interface comprises:
the side surface of the sealing kettle body (30) is connected with a plurality of input pipelines, and at least one input pipeline extending into a pressure chamber on the side surface of the sealing kettle body (30) is configured into a second measuring pipe (140);
it is characterized in that the preparation method is characterized in that,
the second measuring pipe (140) is of an openable structure, so that after the cement slurry 300 continues to perform a setting and hardening reaction for a preset time, stable and slow fluid is continuously pumped to a gap between the cement sheath and the inner wall of the sealing kettle body 30.
8. The monitoring device for high-simulation measurement of cement bond strength of a well cementation-interface of claim 7 is characterized in that when the second window (120) at the position of the second measuring pipe (140) is used for observing the looseness between the cement sheath and the inner wall of the kettle body, the pumping of the fluid is stopped, the pumping pressure at the moment is recorded for representing the bond strength between the simulated cement sheath and the casing pipe, and the pumping pressure is in positive correlation with the bond strength between the cement sheath and the wall of the well.
9. The monitoring device for high-simulation measurement of cementing strength of a well cementation-interface according to claim 8, characterized in that a flow detection device (70), a fluid delivery device (80) and a pressure gauge (100) are arranged above each input pipeline for injecting pressurized fluid into the sealing kettle body (30), and the input pipelines are in mechanical and/or electrical circuit communication with a controller (90).
10. The monitoring device for high-simulation measurement of cement bond strength of a well cementation-interface as claimed in claim 9, wherein the respective ends of the first (130) and second (140) pipes are within the visible range of the first (110) and second (120) windows.
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