WO2012173585A1 - Method and installation for determination of hydro-break pressure of cement stone - Google Patents

Method and installation for determination of hydro-break pressure of cement stone Download PDF

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Publication number
WO2012173585A1
WO2012173585A1 PCT/UA2012/000064 UA2012000064W WO2012173585A1 WO 2012173585 A1 WO2012173585 A1 WO 2012173585A1 UA 2012000064 W UA2012000064 W UA 2012000064W WO 2012173585 A1 WO2012173585 A1 WO 2012173585A1
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WIPO (PCT)
Prior art keywords
pressure
testing chamber
hydro
fluid
hydraulic pump
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Application number
PCT/UA2012/000064
Other languages
French (fr)
Inventor
Andrii SKOCHELIAS
Pavlo MAZUROK
Sergey ZUBKOV
laroslav GAVRYLOV
Mikhail KOROBOCHKIN
Ivan PLAKHETKO
Original Assignee
Tovarystvo Z Obmezhenoju Vidpovidalnistu Ukrsks"
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Application filed by Tovarystvo Z Obmezhenoju Vidpovidalnistu Ukrsks" filed Critical Tovarystvo Z Obmezhenoju Vidpovidalnistu Ukrsks"
Priority to EA201391653A priority Critical patent/EA024784B1/en
Publication of WO2012173585A1 publication Critical patent/WO2012173585A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082—Investigating permeability by forcing a fluid through a sample
    • G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
    • G01N33/383—Concrete or cement

Definitions

  • the object of the group of inventions is the method for determination -o he-hydr-o-break-pressure-of-eement-stone-and-device-forimp
  • the group of inventions can be used in the oil and gas industry when constructing and repairing wells, and also in construction industry when performing underground, underwater and any other kind of works related to usage of cement mixture for creation of impervious layer.
  • the qualitative and quantitative performance data of oil and gas wells depend on the quality of their cementing, which is directly determined by the impervious characteristics of the cement stone formed in the well. In their turn the characteristics of the cement stone depend on the quality of the oilwell cement and mixtures used for its formation.
  • the impervious characteristics of the cement stone and its ability to resist water and gas pressure with the aim to make optimal choice of oilwell cement and necessary additional mixtures before their use in the real well or at any other real construction site. It is obvious that the conduction of the preliminary determination of the qualitative characteristics of the cement stone when modeling various geological conditions provides an opportunity to lower costs at the further operation of the well or any other construction site significantly.
  • cement sheath - cased hole The most important qualitative characteristic of the cement stone that defines its ability to provide impermeability in the contact zone "cement sheath - cased hole" is the value of hydro-break pressure. When exceeding this pressure the cement stone that has the form of the cement sheath in the well starts to conduct fluid.
  • the hydro-break pressure is determinant for the choice of any oiiwell cement for the use in cementing of the well.
  • the disadvantage of this known method and device is very low accuracy of the received results of the research as they are based on the pressure meter measurement data received at the moment of the hydro- break, which is determined by the operator of the research apparatus visually.
  • the accuracy of the received results depends on the number of subjective human factors, specific for the research device operator, and in particular, his attentiveness and speed of reaction.
  • the method includes forming of the cement stone in the testing chamber, supply of the fluid to the testing chamber under pressure, observation of the pressure and appearance of the fluid from the exhaust outlet of the testing chamber.
  • the device includes cylinder with compressed gas, tank with the fluid, testing chamber in the form of hollow cylinder with front and back end lids, equipped with inlet and outlet holes, pressure gauges, all of which are connected with each other in series by pipelines.
  • the pressure gauges are made in the form of indicating manometers.
  • the hydro-break pressure is - determined -by the operator with- the-help " of these indicatino; manometers.
  • the disadvantage of the known device is small range of pressures that can be created by it, as the maximum pressure created by the device with the pump absent will not exceed the pressure in the gas cylinder.
  • disadvantage of the device is low accuracy of the determination of the moment of hydro-break and pressure in that time, as the hydro-break moment is determined visually by the fact of fluid leak from the outlet hole of the testing chamber back end lid, and the pressure is determined through observation of the readings of several pressure gauges simultaneously.
  • the disadvantages of device result in the disadvantage of the method, that is low accuracy of the received research results because of the influence of the subjective human factors (attentiveness, speed of reaction), typical for the research device operator, who has to simultaneously adjust the increase of pressure, follow several pressure gauges and determine the moment of fluid leak through testing chamber back end lid outlet hole.
  • testing chamber in the form of cylinder with piston, hydraulic pump and computer for the control of apparatus operation parameters
  • IPC G01 N3/12, G01N3/02 issue date 21.07.2005 There is known device for measuring of the degree of shrinkage of the cement stone that includes testing chamber in the form of cylinder with piston, hydraulic pump and computer for the control of apparatus operation parameters
  • the known device is not applicable for usage with the aim of determination of value of hydro-break pressure of the cement stone, as the testing chamber does not have exhaust outlets for fluid outflow.
  • the known device for determination of the degree of shrinkage of the cement stone that includes hydraulic pump, testing chamber in the form of hollow cylinder with front and back end lids, equipped with inlet and outlet holes, tank for fluid and microcontroller that performs the control over device operation parameters, all of which are connected in series by pipelines (the USA patent No7296927, IPC G01 N3/00, published 20.11.2007).
  • This device is unsuitable for usage with the aim of determination of the hydro-break pressure of cement stone, as the testing chamber is designed only for continuous circulation fluid.
  • the most close to the declared group of inventions is the know method and device for determination of the hydro-break pressure of cement stone (see Amerkhanova S.I. "Increase of the operating reliability of the well lining at the late stage of the exploitation of the oil deposits” Dissertation for the degree of Candidate of technical sciences, Ufa, 2002).
  • the method includes locating of the cement stone in the testing chamber, supply of the fluid to the testing chamber by hydraulic pump, gradual increase of pressure, visual observation of the fluid outflow from the testing chamber and observation of the pressure change.
  • the device includes hydraulic pump, testing chamber in the form of hollow cylinder with front and back end lids, equipped with inlet and outlet holes, pressure gauge, all of which are connected with each other in series by pipelines.
  • the pressure gauge is made in the form of indicating manometer. Observations of the pressure changes are made with the help of this manometer.
  • Front end lid of the testing chamber has inlet hole for fluid supply.
  • Back end lid has one outlet hole located in its center for fluid outflow after hydro-break of cement stone.
  • the main disadvantage of the known method is low accuracy of the determination of the moment of hydro-break and fluid pressure at this moment.
  • the operator of the device, on which the method is applied is required to do several actions simultaneously: observations of the outlet hole of the testing chamber, observations of the manometer, adjusting of the operation mode of the hydraulic pump.
  • the accuracy of the results essentially depends on the speed of reaction of the operator, his observancy and many other subjective human factors that lead to the practical inadaptability of the known method for the use in real working conditions, specifically in the well.
  • the accuracy of the received results in the known method decreases due to the influence of the air that is left in the testing chamber and creates air "pockets" and bubbles.
  • the main disadvantage of the known device is low accuracy of the determination of the moment of hydro-break and pressure of the fluid at that time, as the hydro-break moment is determined visually by the fact of fluid leak from the outlet hole of the testing chamber back end lid, and the pressure is determined through observation of the readings of pressure gauge. It is necessary to highlight the point that in the known device the manometer is installed not on the testing chamber, but on the tank with fluid and it actually measures the pressure in it, and not in the testing chamber. Apart from this the moment of fluid outflow from the back end lid outlet hole is not the actual moment of the hydro-break of the cement stone.
  • the fluid after hydro-break appears along its perimeter (meaning - along the walls), certain amount of time is needed for the fluid to be collected on the back end lid, cover the distance from perimeter of the back end lid to its center and flow outside through the hole in it and be noticed by operator.
  • the task of the group of inventions is to increase the accuracy of determination of the hydro-break pressure of cement stone through automatization of the process of data reading from pressure gauge and their further processing and through elimination of the influence of the -residual-air— in-the-testing ⁇ ehamber-onHhe ⁇ hydro ⁇ break " process— during— performance of the research.
  • the stated task is fulfilled by the fact that in the known method of the determination of the hydro-break pressure of cement stone, which includes location of the cement stone in the testing chamber, supply of the fluid to the testing chamber by the hydraulic pump, gradual increase of the fluid pressure, visual observation of the fluid outflow from the testing chamber and observation of the pressure change, according to the claimed engineering design before the gradual increase of the fluid pressure the air is blown off from the testing chamber, observation of the pressure change and operation control of the hydraulic pump is performed with the help of the information processing device.
  • the approximated curve of pressure change with time is plotted.
  • the hydro-break pressure is determined by the point of outlet of the plotted curve to the plateau, averaging out the data of not less than two consequentially performed researches. It is recommended to perform the method, in which a computer is used as the information processing device.
  • the stated task is achieved by the fact that in the known device for the determination of the hydro-break of the cement stone that includes hydraulic pump, testing chamber in the form of the hollow cylinder with front and back end lids, equipped with the inlet and outlet holes and pressure gauge that are connected with each other in series by pipelines, according to the claimed engineering design the device is equipped with the information processing device, connected to the pressure gauge, installed on the testing chamber, and hydraulic pump, and outlet-holes-of-the-baGk-end-nd-are-loeated-along-its-perimeter—
  • a computer is an information processing device.
  • testing chamber is equipped with the heaters, connected to the information processing device.
  • the technical result is the increase of the accuracy of determination of hydro-break pressure of cement stone due to the application of the information processing device for the data reading from the pressure gauge and its automatic processing.
  • the determination of the hydro-break pressure by the approximated curves that are plotted on the basis of the data processed by the information processing device allows receiving of the accurate results of the research in visual form.
  • averaging out of the data of not less than two consequentially performed researches allows avoiding of the accidental discrepancies, tolerances and neutralizing of their influence on the final result of measurements.
  • the technical result is the increase of the accuracy of the determination of hydro-break pressure of the cement stone due to equipping of the device with the information processing device, connected to the pressure gauge installed on the testing chamber and hydraulic pump.
  • Such device allows monitoring changes of the fluid pressure values directly in the testing chamber, controlling the operation mode of the hydraulic pump and heaters.
  • Implementation of the computer for example, a laptop as such device allows using wide range of software designed for popular-operation-systems-(OS -to-eontfo device operation-parameters:
  • FIG. 1 general installation diagram
  • FIG. 2 testing chamber (longitudinal sectional drawing);
  • FIG. 3 testing chamber with installed core (longitudinal sectional drawing);
  • Fig. 4 view of the front end lid of the testing chamber;
  • Fig. 5 view of the back end lid of the testing chamber
  • the device for determination of the hydro-break pressure of cement stone includes hydraulic pump 2, testing chamber 3 in the form of the hollow cylinder with front 4 and back 5 end lids, connected with each other in series by pipelines 1.
  • the device is equipped with the information processing device, performed in the form of computer 6, which is connected to the hydraulic pump 2.
  • Outlet holes 7 of the back end lid 5 are located along its perimeter.
  • the front end lid 4 has three holes, as follows: hole, to which the pressure gauge 8 is connected, hole connected with the nipple 9 for air blowing off, and outlet hole, connected to the nipple 10 for fluid supply.
  • Pressure gauge 8 is equipped with the electronic interface and connected to the computer 6.
  • the testing chamber 3 is equipped with the heaters 11 , connected to the computer 6.
  • the device is also equipped with the filter 12, receiver 13, safety valve 14, tap 15 and manometer 16.
  • the testing chamber can include installed core 17, as shown on the Fig. 3
  • the sample of the cement stone is formed.
  • the front 4 and back 5 end lids with the holes are dismounted and substituted by the temporary solid lids (that are shown on the drawings).
  • the core 17 is installed.
  • the cement mixture is poured inside the testing chamber 3.
  • the testing chamber 3 is covered with the solid lids from both sides and it is left until complete hardening of the mixture.
  • the solid lids are took off and on the testing chamber 3 with the located inside it sample of the cement stone the top end lid 4 and bottom end lid 5are_mounted-and-the-gauge-8 and pipeline-1-for-fluid-supply througrrnipple
  • the testing chamber 10 are connected to the testing chamber 3.
  • the specially prepared solution is used that is in a tank (not shown on the drawings) or tapwater.
  • the pressure is lowered down to the initial value and then its gradual decrease is performed again until the moment of hydro-break, as described above.
  • the hydro-break pressure values received in the first and second researches are averaged out to receive final result. If necessary the number of researches can be more than two.
  • In-the-proGess-of-deviee-oper-ation-the-filte ⁇ -clean fluid from foreign impurities, and hydraulic pumping in the pipeline 1 caused by the work of hydraulic pump 2 is eliminated using receiver 13.
  • the valve 14 helps to prevent excessive pressure in pipeline 1 , excluding appearance of the emergency situation.
  • the pressure in the pipeline 1 is controlled with the help of manometer 16.

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Abstract

The object of the group of inventions is the method for determination of the hydro-break pressure of cement stone and device for implementation of this method. The sphere of use of the method and device is oil and gas industry. The method includes locating of the cement stone in the testing chamber (3), supply of the fluid to the testing chamber (3) by hydraulic pump (2), gradual increase of pressure, visual observation of the fluid outflow from the testing chamber and observation of the pressure change. Before gradual increase of fluid pressure from the testing chamber the air is blown off. The observation of the pressure change and control of hydraulic pump operation is performed with the help of the information processing device (6). By the data received and processed by this device the approximated curve of pressure change through time is plotted, and the hydro-break pressure is determined by the point of outlet of the plotted curve to plateau, averaging out the data of not less than two consequentially conducted researches. The device includes hydraulic pump (2), testing chamber (3) with end lids (4,5), pressure gauge (8), information processing device (6), which is connected to the pressure gauge (8) and hydraulic pump (2). Outlet holes (7) of the back end lid (5) are located along its perimeter. The technical result is the increase of the accuracy of the hydro-break pressure of cement stone.

Description

Method and installation for determination of hydro-break pressure of cement stone
Technical Field
The object of the group of inventions is the method for determination -o he-hydr-o-break-pressure-of-eement-stone-and-device-forimp
of this method. The group of inventions can be used in the oil and gas industry when constructing and repairing wells, and also in construction industry when performing underground, underwater and any other kind of works related to usage of cement mixture for creation of impervious layer.
The qualitative and quantitative performance data of oil and gas wells, in particular, depend on the quality of their cementing, which is directly determined by the impervious characteristics of the cement stone formed in the well. In their turn the characteristics of the cement stone depend on the quality of the oilwell cement and mixtures used for its formation. Thus there is an urgent problem to determine the impervious characteristics of the cement stone and its ability to resist water and gas pressure with the aim to make optimal choice of oilwell cement and necessary additional mixtures before their use in the real well or at any other real construction site. It is obvious that the conduction of the preliminary determination of the qualitative characteristics of the cement stone when modeling various geological conditions provides an opportunity to lower costs at the further operation of the well or any other construction site significantly. The most important qualitative characteristic of the cement stone that defines its ability to provide impermeability in the contact zone "cement sheath - cased hole" is the value of hydro-break pressure. When exceeding this pressure the cement stone that has the form of the cement sheath in the well starts to conduct fluid. The hydro-break pressure is determinant for the choice of any oiiwell cement for the use in cementing of the well.
Background Art
There is known method and device for evaluation of the -impermeability— of— the-contact— of— the-eement— stone-with— the— bounding- surface (see Bulatov A.I. "Forming and work of cement stone in well", Moscow 1990, pages 211-212). The method is in the supply of water under pressure to the center of the edge of the cement stone and visual observation of water appearing on its opposite edge with simultaneous measuring of the supplied water pressure. In the device created for the realization of this method the edge of the cement stone that is of cylindrical form comes into contact with the metal surface. The fluid pressure is measured with the help of the pressure meter.
The disadvantage of this known method and device is very low accuracy of the received results of the research as they are based on the pressure meter measurement data received at the moment of the hydro- break, which is determined by the operator of the research apparatus visually. Thus, the accuracy of the received results depends on the number of subjective human factors, specific for the research device operator, and in particular, his attentiveness and speed of reaction.
There is known method and device for determination of the permeability of the cement stone (see Said Ibrahim AN Farah "Development of the compositions for the recovery of the impermeability of bore hole annulus upon full repair of wells", Abstract of the dissertation for the degree of Candidate of Technical sciences, Ufa, 2003, pages 13). The method includes forming of the cement stone in the testing chamber, supply of the fluid to the testing chamber under pressure, observation of the pressure and appearance of the fluid from the exhaust outlet of the testing chamber. The device includes cylinder with compressed gas, tank with the fluid, testing chamber in the form of hollow cylinder with front and back end lids, equipped with inlet and outlet holes, pressure gauges, all of which are connected with each other in series by pipelines. The pressure gauges are made in the form of indicating manometers. The hydro-break pressure is - determined -by the operator with- the-help" of these indicatino; manometers.
The disadvantage of the known device is small range of pressures that can be created by it, as the maximum pressure created by the device with the pump absent will not exceed the pressure in the gas cylinder. Considerate disadvantage of the device is low accuracy of the determination of the moment of hydro-break and pressure in that time, as the hydro-break moment is determined visually by the fact of fluid leak from the outlet hole of the testing chamber back end lid, and the pressure is determined through observation of the readings of several pressure gauges simultaneously.
The disadvantages of device result in the disadvantage of the method, that is low accuracy of the received research results because of the influence of the subjective human factors (attentiveness, speed of reaction), typical for the research device operator, who has to simultaneously adjust the increase of pressure, follow several pressure gauges and determine the moment of fluid leak through testing chamber back end lid outlet hole.
There is known device for measuring of the degree of shrinkage of the cement stone that includes testing chamber in the form of cylinder with piston, hydraulic pump and computer for the control of apparatus operation parameters (international publication WO 2005065411 , IPC G01 N3/12, G01N3/02 issue date 21.07.2005). Back lid of the testing chamber is made "blind" that is it does not have outlets.
Despite some construction similarity with the device that is being claimed the known device is not applicable for usage with the aim of determination of value of hydro-break pressure of the cement stone, as the testing chamber does not have exhaust outlets for fluid outflow.
The known device for determination of the degree of shrinkage of the cement stone that includes hydraulic pump, testing chamber in the form of hollow cylinder with front and back end lids, equipped with inlet and outlet holes, tank for fluid and microcontroller that performs the control over device operation parameters, all of which are connected in series by pipelines (the USA patent No7296927, IPC G01 N3/00, published 20.11.2007).
This device is unsuitable for usage with the aim of determination of the hydro-break pressure of cement stone, as the testing chamber is designed only for continuous circulation fluid.
The most close to the declared group of inventions is the know method and device for determination of the hydro-break pressure of cement stone (see Amerkhanova S.I. "Increase of the operating reliability of the well lining at the late stage of the exploitation of the oil deposits" Dissertation for the degree of Candidate of technical sciences, Ufa, 2002). The method includes locating of the cement stone in the testing chamber, supply of the fluid to the testing chamber by hydraulic pump, gradual increase of pressure, visual observation of the fluid outflow from the testing chamber and observation of the pressure change. The device includes hydraulic pump, testing chamber in the form of hollow cylinder with front and back end lids, equipped with inlet and outlet holes, pressure gauge, all of which are connected with each other in series by pipelines. The pressure gauge is made in the form of indicating manometer. Observations of the pressure changes are made with the help of this manometer. Front end lid of the testing chamber has inlet hole for fluid supply. Back end lid has one outlet hole located in its center for fluid outflow after hydro-break of cement stone.
The main disadvantage of the known method is low accuracy of the determination of the moment of hydro-break and fluid pressure at this moment. The operator of the device, on which the method is applied, is required to do several actions simultaneously: observations of the outlet hole of the testing chamber, observations of the manometer, adjusting of the operation mode of the hydraulic pump. Thus the accuracy of the results essentially depends on the speed of reaction of the operator, his observancy and many other subjective human factors that lead to the practical inadaptability of the known method for the use in real working conditions, specifically in the well. Apart from this the accuracy of the received results in the known method decreases due to the influence of the air that is left in the testing chamber and creates air "pockets" and bubbles.
The main disadvantage of the known device is low accuracy of the determination of the moment of hydro-break and pressure of the fluid at that time, as the hydro-break moment is determined visually by the fact of fluid leak from the outlet hole of the testing chamber back end lid, and the pressure is determined through observation of the readings of pressure gauge. It is necessary to highlight the point that in the known device the manometer is installed not on the testing chamber, but on the tank with fluid and it actually measures the pressure in it, and not in the testing chamber. Apart from this the moment of fluid outflow from the back end lid outlet hole is not the actual moment of the hydro-break of the cement stone. As the event of hydro-break happens in the contact zone of the cement stone and the walls of the testing chamber and at the back end lid, the fluid after hydro-break appears along its perimeter (meaning - along the walls), certain amount of time is needed for the fluid to be collected on the back end lid, cover the distance from perimeter of the back end lid to its center and flow outside through the hole in it and be noticed by operator.
The task of the group of inventions is to increase the accuracy of determination of the hydro-break pressure of cement stone through automatization of the process of data reading from pressure gauge and their further processing and through elimination of the influence of the -residual-air— in-the-testing~ehamber-onHhe~hydro^break"process— during— performance of the research.
Disclosure of Invention
As to the method the stated task is fulfilled by the fact that in the known method of the determination of the hydro-break pressure of cement stone, which includes location of the cement stone in the testing chamber, supply of the fluid to the testing chamber by the hydraulic pump, gradual increase of the fluid pressure, visual observation of the fluid outflow from the testing chamber and observation of the pressure change, according to the claimed engineering design before the gradual increase of the fluid pressure the air is blown off from the testing chamber, observation of the pressure change and operation control of the hydraulic pump is performed with the help of the information processing device. By the data received and processed by this device the approximated curve of pressure change with time is plotted. The hydro-break pressure is determined by the point of outlet of the plotted curve to the plateau, averaging out the data of not less than two consequentially performed researches. It is recommended to perform the method, in which a computer is used as the information processing device.
As to the device the stated task is achieved by the fact that in the known device for the determination of the hydro-break of the cement stone that includes hydraulic pump, testing chamber in the form of the hollow cylinder with front and back end lids, equipped with the inlet and outlet holes and pressure gauge that are connected with each other in series by pipelines, according to the claimed engineering design the device is equipped with the information processing device, connected to the pressure gauge, installed on the testing chamber, and hydraulic pump, and outlet-holes-of-the-baGk-end-nd-are-loeated-along-its-perimeter—
It is possible to make a device, where the front end lid has additional hole for air outflow.
It is optimal to make the device, where a computer is an information processing device.
It is appropriate to make a device, where the testing chamber is equipped with the heaters, connected to the information processing device.
As to the method, the technical result is the increase of the accuracy of determination of hydro-break pressure of cement stone due to the application of the information processing device for the data reading from the pressure gauge and its automatic processing. In its turn the determination of the hydro-break pressure by the approximated curves that are plotted on the basis of the data processed by the information processing device allows receiving of the accurate results of the research in visual form. As well as averaging out of the data of not less than two consequentially performed researches allows avoiding of the accidental discrepancies, tolerances and neutralizing of their influence on the final result of measurements.
Additional increase of the measurement accuracy is achieved by the excluding of the influence of the residual air in the testing chamber by its blowing off before gradual increase of the fluid pressure.
As to the device the technical result is the increase of the accuracy of the determination of hydro-break pressure of the cement stone due to equipping of the device with the information processing device, connected to the pressure gauge installed on the testing chamber and hydraulic pump. Such device allows monitoring changes of the fluid pressure values directly in the testing chamber, controlling the operation mode of the hydraulic pump and heaters. Implementation of the computer (for example, a laptop) as such device allows using wide range of software designed for popular-operation-systems-(OS -to-eontfo device operation-parameters:
Additional increase of the accuracy of visual determination of the moment of hydro-break is provided due to the location of the outlet holes of the back end lid of the testing chamber along its perimeter. As the hydro- break takes place in the contact zone of the cement stone and the walls of the testing chamber, and on the back end lid the fluid appears exactly along its perimeter, the location of the outlet holes along this perimeter allows its unobstructed outflow. Thus, it becomes possible to see the appearance of the fluid directly in the moment of hydro-break.
Additionally the accuracy of measuring increases due to the exclusion of the influence of the air present in the testing chamber that becomes possible due to the equipment of the front end lid with the additional hole for air outflow.
It becomes possible to conduct measuring of the hydro-break pressure of cement stone in the conditions that are maximally close to the real conditions of the well, which is achieved by equipping of the testing chamber with the heaters that imitate temperature conditions in the well. Brief Description of Drawings
Implementation of the method is possible with the help of the device, the design of which is provided in the drawings:
Fig. 1 - general installation diagram;
Fig. 2 - testing chamber (longitudinal sectional drawing);
Fig. 3 - testing chamber with installed core (longitudinal sectional drawing); Fig. 4 - view of the front end lid of the testing chamber;
Fig. 5 - view of the back end lid of the testing chamber;
Fig. 6 - graph of the pressure change during conduction of the research -(-appr-oximated-curve-)^
Detailed Description of Drawings
The device for determination of the hydro-break pressure of cement stone includes hydraulic pump 2, testing chamber 3 in the form of the hollow cylinder with front 4 and back 5 end lids, connected with each other in series by pipelines 1. The device is equipped with the information processing device, performed in the form of computer 6, which is connected to the hydraulic pump 2. Outlet holes 7 of the back end lid 5 are located along its perimeter. The front end lid 4 has three holes, as follows: hole, to which the pressure gauge 8 is connected, hole connected with the nipple 9 for air blowing off, and outlet hole, connected to the nipple 10 for fluid supply. Pressure gauge 8 is equipped with the electronic interface and connected to the computer 6.
The testing chamber 3 is equipped with the heaters 11 , connected to the computer 6. The device is also equipped with the filter 12, receiver 13, safety valve 14, tap 15 and manometer 16.
The testing chamber can include installed core 17, as shown on the Fig. 3
Before the beginning of work in the testing chamber 3 the sample of the cement stone is formed. For this from the testing chamber 3 the front 4 and back 5 end lids with the holes are dismounted and substituted by the temporary solid lids (that are shown on the drawings). If necessary inside the chamber 3 the core 17 is installed. The cement mixture is poured inside the testing chamber 3. The testing chamber 3 is covered with the solid lids from both sides and it is left until complete hardening of the mixture. Then the solid lids are took off and on the testing chamber 3 with the located inside it sample of the cement stone the top end lid 4 and bottom end lid 5are_mounted-and-the-gauge-8 and pipeline-1-for-fluid-supply througrrnipple
10 are connected to the testing chamber 3. As fluid in the device the specially prepared solution is used that is in a tank (not shown on the drawings) or tapwater.
One turns on the computer 6, opens the tap 15 and start the hydraulic pump 2 that starts supply fluid by the pipeline 1 to the testing chamber 3. At the beginning of the work the air is blown off from the testing chamber 3 through nipple 9. Then using computer 6 and connected to it gauge 8 one sets and monitors necessary temperature values of the testing chamber 3 and pressure in it, choosing corresponding operation mode of the heaters
11 and hydraulic pump 2. Gradually increasing the fluid pressure in the testing chamber 3 one achieves that value of it, at which the hydro-break of the cement stone takes place. On the basis of the values of pressure in the testing chamber 3, received by the gauge 8, with the help of the computer 6 and installed at it software the approximated curve of pressure change through time is plotted that is rendered on the screen of computer 6. In the moment of the hydro-break of cement stone inside the testing chamber 3, the pressure curve on the screen of computer 6 changes its appearance and instead of increasing comes to plateau showing stable value of pressure inside the chamber 3. This value of pressure is exactly the hydro-break pressure. In the moment of hydro-break the outflow of the fluid happens from the holes 7 of the back end lid 5 that can be stated visually by the operator.
After beginning of the fluid outflow with the help of computer 6 and hydraulic pump 2 connected to it the pressure is lowered down to the initial value and then its gradual decrease is performed again until the moment of hydro-break, as described above. The hydro-break pressure values received in the first and second researches are averaged out to receive final result. If necessary the number of researches can be more than two.
In-the-proGess-of-deviee-oper-ation-the-filte ^-clean — fluid from foreign impurities, and hydraulic pumping in the pipeline 1 caused by the work of hydraulic pump 2 is eliminated using receiver 13. The valve 14 helps to prevent excessive pressure in pipeline 1 , excluding appearance of the emergency situation. The pressure in the pipeline 1 is controlled with the help of manometer 16.

Claims

Claims
1. The method of determination of the hydro-break pressure of cement stone that includes location of the cement stone in the testing chamber, supply of the fluid to the testing chamber by the hydraulic pump, gradual increase of the fluid pressure, visual observation of the fluid outflow from the testing chamber and observation of the pressure change, that is different by that that before the gradual increase of the fluid pressure the air is blown off from the testing chamber, observation of the pressure change and operation control of the hydraulic pump is performed with the _he-lp_QfJhe_info.r-mation_pr-ocessing-dev ce-and
determined by the output point of the approximated curve to the plateau, averaging out the data of not less than two consequentially performed researches.
2. The method according to claim 1 , which is different by that that a computer is used as information processing device.
3. The device for the determination of the hydro-break of cement stone that includes hydraulic pump, testing chamber in the form of the hollow cylinder with front and back end lids, equipped with the inlet and outlet holes and pressure gauge that are connected with each other in series by pipelines, which is different by that that the device is equipped with the information processing device, connected to the pressure gauge, installed on the testing chamber, and hydraulic pump, and outlet holes of the back end lid are located along its perimeter.
4. The device according to claim 3, which is different by that that the front end lid has additional hole for air outflow.
5. The device according to claim 3, which is different by that that a computer is made to be the information processing device.
6. The device according to claim 3, which is different by that that the testing chamber is equipped with the heaters connected to the information processing device.
PCT/UA2012/000064 2011-06-14 2012-06-13 Method and installation for determination of hydro-break pressure of cement stone WO2012173585A1 (en)

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CN103383325A (en) * 2013-07-18 2013-11-06 河海大学 Testing device for simulating concrete test piece hydraulic fracture under multi-field coupling condition
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CN113899624A (en) * 2020-06-22 2022-01-07 中国石油天然气股份有限公司 Method, device and storage medium for controlling pressure in gas well shaft
CN113899624B (en) * 2020-06-22 2023-08-22 中国石油天然气股份有限公司 Method, apparatus and storage medium for controlling pressure in a gas well bore
CN113218645A (en) * 2021-05-06 2021-08-06 燕山大学 High-pressure aviation hydraulic pipeline performance test experiment table and test method thereof
CN114323428A (en) * 2021-12-24 2022-04-12 南京柯瑞特种陶瓷股份有限公司 Isostatic pressing detector for ceramic honeycomb carrier
CN114323428B (en) * 2021-12-24 2024-05-31 南京柯瑞特种陶瓷股份有限公司 Isostatic pressure detector for ceramic honeycomb carrier
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