CN110082089B - Zero displacement measuring device and measuring and controlling method under sleeve string circulation elastoplastic thermal stress - Google Patents
Zero displacement measuring device and measuring and controlling method under sleeve string circulation elastoplastic thermal stress Download PDFInfo
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- CN110082089B CN110082089B CN201910434096.5A CN201910434096A CN110082089B CN 110082089 B CN110082089 B CN 110082089B CN 201910434096 A CN201910434096 A CN 201910434096A CN 110082089 B CN110082089 B CN 110082089B
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 122
- 230000008646 thermal stress Effects 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 25
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- 230000006698 induction Effects 0.000 claims description 70
- 238000005259 measurement Methods 0.000 claims description 24
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- 125000004122 cyclic group Chemical group 0.000 claims description 19
- 238000002474 experimental method Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 2
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- 239000003208 petroleum Substances 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
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- 229910052895 riebeckite Inorganic materials 0.000 description 4
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
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- 229910000831 Steel Inorganic materials 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/14—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/002—Thermal testing
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a sleeve string circulation elastoplastic thermal stress lower-keeping zero displacement measuring device and a measuring and controlling method. The invention has the beneficial effects that: the loading system can timely load and resist shrinkage and expansion caused by thermal stress change of the casing string, so that the casing string displacement control section can be controlled to be at zero displacement of 0+/-0.01 in under ten thermal cycles.
Description
Technical Field
The invention relates to a high-precision displacement measurement and control device and a method for enabling a whole pipe sleeve string to keep 0+/-0.01 in zero displacement under cyclic elastoplastic thermal stress. In Canadian zone SAGD and CSS well conditions, the casing string of the sealed special make-up joint is subjected to ten elastoplastic thermal stress cycles from room temperature to 290 ℃. In such well conditions, stress relaxation of the casing string may occur. The method is invented for evaluating whether the special buckling joint is leaked or not under the well condition, and whether the casing string is failed or not.
Background
In recent years, the environmental well conditions of the international petroleum and natural gas industry are becoming more complex, and more stringent requirements are put forth on the oil casing and the special buckling joint used, wherein the special buckling joint of the oil casing is an important link of high strength and high sealing performance. Canadian zone SAGD and CSS wells are particularly demanding, and the casing string is subjected to more severe cyclic plastic thermal stresses in addition to the ubiquitous elastic pull-in compressive and internal/external compressive composite forces.
Under normal well conditions, petroleum can be extracted below 180 ℃. However, under the well condition, the petroleum is super-thick oil, and the petroleum can be collected only by being driven by high-temperature steam. Cycling the temperature of the string of casing downhole from room temperature to 290 c by cycling the high temperature steam in and out, such thermal cycling is experienced up to 10 times. The casing string can expand and contract in a free state under the action of heating and cooling. However, in this well condition, the cement seals the casing string so that the casing string cannot deform freely, thereby creating tensile and compressive stresses within the casing string material due to heating and cooling, and creating plastic stress relaxation at high temperatures and low Wen Dianfa. When plastic deformation or relaxation occurs, the casing string may fail in pipe body fracture, special button joint leakage, thread fracture, etc. Once any failure condition occurs, huge economic loss is caused to petroleum production, and even serious pollution is caused to the environment. Therefore, before using the special buckle joint sleeve string, the capability of the whole pipe to resist the service condition of the well condition must be tested in a laboratory by using a physical service performance evaluation test.
In order to simulate the service condition of the casing string, a laboratory pre-adopts a displacement control load to simulate the casing string to be sealed by cement. And heating the sleeve string by adopting heating equipment to simulate the steam spraying process. And loading the sleeve string by using an experimental load frame. The length of the sleeve string is kept unchanged by zero displacement all the time during thermal cycling through compression or tensile load.
According to various actual working conditions, 11 internationally known petroleum enterprises and international petroleum standard authoring institutions unify well conditions of all blocks, and a special qualification standard (ISO/PAS 12835 standard TWCCEP) for casing joints of thermal recovery wells is authored. The control accuracy of the prescribed zero displacement is determined to be 0 + -0.01 in or 0 + -0.254 mm. The precision is an ultra-high requirement for the evaluation test of the service performance of the whole pipe, and can be compared favorably with a small sample of the material mechanics. The solution is obtained by searching the current domestic and foreign documents and visiting similar laboratories.
Through the search of various papers, patents and other documents, no relevant data report or similar method has been found to solve the problem. It is known by multiple parties that no department or unit in China can complete all test items specified by the ISO/PAS12835 standard (TWCCEP). Then research and development are carried out in a laboratory of the displacement sensor, various heating and thermal insulation methods are searched, the influence of the displacement sensor cannot be eliminated, the temperature of the displacement sensor can reach 50-60 ℃ due to the thermal effect, the temperature exceeds the highest temperature born by the displacement sensor, and the precision of the displacement sensor is reduced or even damaged. More than ten displacement installation devices are designed, and load distortion caused by displacement drift during pull/press reversing cannot be eliminated. The load system reaction rate cannot track the thermal stress changes in time. The method is invented finally after many times of failure and summary.
The invention is a special method for zero displacement measurement control in a casing string circulation elastoplastic thermal stress test for simulating SAGD and CSS well conditions in ISO/PAS 12835 standard (TWCCEP).
Disclosure of Invention
Aiming at the technical blank in China at present, the first aim of the invention is to provide a device for measuring the zero displacement of the sleeve string under the cyclic elastoplastic thermal stress; the second purpose is to provide a measurement and control method for keeping zero displacement under the cyclic elastoplastic thermal stress of the sleeve string, so as to realize the function and the capability of measuring and controlling the special buckle sleeve string to keep zero displacement unchanged under the cyclic thermal stress.
In order to achieve the first object, the present invention adopts the following technical scheme: the utility model provides a sleeve pipe cluster circulation elastoplastic thermal stress keeps zero displacement measuring device down, this measuring device includes a pair of rigidity right angle frame and lower rigidity right angle frame, measuring element, the perpendicular limit of a pair of rigidity right angle frame and lower rigidity right angle frame is symmetrical respectively to be set up in sleeve pipe cluster displacement measuring section's upper and lower sleeve pipe both sides, and horizontal limit symmetry is equipped with upper and lower positioner of installation measuring element respectively, and both sides measuring element all parallels with sleeve pipe cluster displacement measuring section between upper and lower positioner.
The measuring component comprises a bulletless gravity rope, a magnetic induction displacement sensor female end and a magnetic induction sensing rod, one end of the bulletless gravity rope of the measuring component is connected to the upper positioning device, the other end of the bulletless gravity rope is bolted with the magnetic induction sensing rod, the magnetic induction sensing rod is located in an inner hole of the magnetic induction displacement sensor female end and moves freely, the magnetic induction displacement sensor female end is fixed on the lower positioning device of the lower rigidity right angle frame, and the magnetic induction sensing rod is coaxial with the magnetic induction displacement sensor female end.
The upper positioning device is provided with a boss on the outer side surface of the right-angle side, an M6 screw hole connected with the inelastic gravity rope is arranged on the boss and fixed through a screw, and an adjusting gasket is arranged between the M6 screw hole and the screw; the lower positioning device comprises a clamping arc arranged on the outer side face of the right-angle side, M10 screw holes are formed in the two sides of the clamping arc, and the clamping arc is fixed through M10 screws.
The right angle frames with upper and lower rigidities are made of 35CrMo materials.
The perpendicularity of the vertical edge and the horizontal edge of the upper and lower rigidity right-angle frames is 0.1mm.
The equidistant tolerance of the two hole centers of the lateral screw holes of the lateral side of the lower rigidity right angle frame to the surface of the lateral side of the lower rigidity right angle frame is within +/-0.10 mm.
The height of the boss on the transverse side of the upper rigidity right-angle frame is-2 mm of the outer radius of the female end of the displacement sensor.
The thickness of the adjusting gasket is 0.05mm, 0.1mm, 0.5mm, 0.8mm or 1.0mm, and the adjusting gasket is used for adjusting concentricity of the magnetic induction sensing rod and the magnetic induction displacement sensor female end.
In order to achieve the second object, another technical scheme adopted by the invention is as follows: a measurement and control method for keeping zero displacement under the cyclic elastoplastic thermal stress of a casing string comprises the following steps:
step one: installing a measuring device: the sleeve string circulation elastoplastic thermal stress zero displacement measurement device is arranged on a vertical loading experiment machine, and the gravity of the vertical loading frame, the sleeve string and the magnetic induction sensing rod is vertical to the ground;
step two: simulation heating: electric induction heating is selected, heating induction coils are spirally arranged on the sleeve string at equal intervals of 200mm, and a magnetic field is only generated in the sleeve string;
step three: measurement: the measurement and control system adopts a multichannel control loop with the iteration rate of 2.5KHz and a Mu Ge servo controller with a unique control closed-loop technology, so that the impact-free smooth loading of displacement control load is realized;
step four: data transfer: in the heating and cooling process, the displacement of the displacement measuring section changes, the magnetic induction sensing rod moves in the female end of the magnetic induction displacement sensor, a change signal is transmitted to the Mu Ge servo controller, and after the computer software collects information, the vertical loading experiment machine loads the sleeve string, so that the sleeve string always keeps zero displacement.
The precision of the magnetic induction displacement sensor is 0.01mm; the thermocouple is of a K-type welding type; the gap between the magnetic induction sensing rod and the magnetic induction sensor female end hole is equal in circumference by measuring with a vernier caliper with the precision of 0.01 mm.
The invention has the advantages that a measurement and control method for keeping zero displacement under the thermal plastic circulating stress of the casing string is adopted, a displacement measuring device is designed and manufactured, a high-precision magnetic induction displacement sensor, a K-type welding thermocouple and a Mu Ge controller of a high-speed iteration unique control closed loop technology are selected, the thermal circulating experiment of ISO 12835 is successfully completed, and the aim of simulating the service conditions of the Canadian block SAGD well and CSS well condition casing string is achieved. The temperature error in the displacement control section is controlled within +/-1 ℃, and the loading system can timely load and resist shrinkage and expansion caused by thermal stress change of the casing string, so that the casing string displacement control section can be controlled to be in zero displacement of 0 +/-0.01 in under ten thermal cycles.
Drawings
FIG. 1 is a schematic illustration of displacement and temperature testing in accordance with the present invention;
FIG. 2 is a schematic view of a displacement measuring device according to the present invention;
FIG. 3 is a schematic view of an upper rigid rectangular frame of the present invention;
FIG. 4 is a schematic top view of FIG. 3;
FIG. 5 is a schematic view of a lower stiffness rectangular frame of the present invention;
FIG. 6 is a schematic top view of FIG. 5;
FIG. 7 is a schematic view of the measurement device of the present invention mounted on a vertical loading laboratory machine;
FIG. 8 is a schematic diagram of the general assembly of the present invention;
FIG. 9 is a graph showing displacement, temperature, load, and internal pressure as a function of time for a first cycle;
FIG. 10 is a graph of the time course of the 2 nd to 4 th cyclic shift, temperature, load, internal pressure;
FIG. 11 is a graph showing the changes in the temperature, load, and internal pressure with time for the 6 th to 10 th cyclic shifts.
In the figure:
1. special buckling collar 2, pipe body 3 and upper end plug
4. Lower end plug 5, temperature measuring point 6, heat preservation asbestos cloth
7. Heating induction coil 8, rigidity screw 9 and upper rigidity right-angle frame A
10. Lower rigidity right angle frame A11, upper rigidity right angle frame B12 and lower rigidity right angle frame B
13. Spring-free gravity rope 14, magnetic induction displacement sensor female end 15 and magnetic induction sensing rod
16. Reinforcing rib 17, boss 18 and M6 threaded holes
19. Winding screw 20, adjusting washer 21 and adjusting nut
22. M10 threaded hole 23, clamping arc 24 and M10 screw
25. End plug flat end face 26, vertical loading experiment machine 27 and spherical gasket A
28. Upper screw 29, screw nut 30 and upper platform
31. Lower lead screw 35, lower lead screw nut 36, spherical spacer C
37. Spring washer 38, length adjustment nut 39, mu Ge servo controller
40. Computer 41, communication line
Detailed Description
The invention relates to a device for measuring zero displacement under the cyclic elastoplastic thermal stress of a sleeve string and a measurement and control method.
As shown in fig. 1 to 6, the device for measuring zero displacement under cyclic elastoplastic thermal stress of a casing string comprises a rigidity screw, an upper rigidity right-angle frame, a measuring part, a lower rigidity right-angle frame and a casing string displacement measuring and controlling section, wherein the rigidity screw is spot-welded to a displacement measuring end point of the surface of the casing string, the rigidity screw is the casing string displacement measuring end point, the upper rigidity right-angle frame is positioned on the rigidity screw at the upper end point of the casing string displacement measuring and controlling section, and the lower rigidity right-angle frame is positioned on the rigidity screw at the lower end point of the casing string displacement measuring section. The transverse edge of the upper rigidity right-angle frame is provided with an upper positioning device for installing a measuring component, and the lower rigidity right-angle frame is provided with a lower positioning device. For adjusting and fixing the measuring member. The measuring component is parallel to the sleeve string displacement measurement and control section between the upper positioning device and the lower positioning device; the upper and lower rigidity right angle frames are made of 35CrMo materials, the verticality between the horizontal edge and the vertical edge of the upper and lower rigidity right angle frames is 0.1mm, and the equidistant tolerance of the two hole centers of the side screw holes of the horizontal edge of the lower rigidity right angle frame is within +/-0.10 mm; the height of the upper boss 17 on the horizontal side of the upper rigidity right-angle frame is-2 mm of the outer radius of the female end of the magnetic induction displacement sensor; the thickness of the adjusting pad 20 is 0.05mm, 0.1mm, 0.5mm, 0.8mm or 1.0mm, and is used for adjusting the concentricity of the magnetic induction sensing rod 15 and the magnetic induction displacement sensor female end 14.
The measuring part comprises a bulletless gravity rope 13, a magnetic induction displacement sensor female end 14 and a magnetic induction sensing rod 15. One end of the inelastic gravity rope 13 of the measuring part is connected to the upper positioning device, the magnetic induction sensing rod 15 is tied to the other end of the inelastic gravity rope, the magnetic induction sensing rod 15 is arranged in a hole of the magnetic induction displacement sensor female end 14, the magnetic induction displacement sensor female end 14 is fixed to the lower positioning device of the lower rigidity right angle frame, and the magnetic induction sensing rod 15 is coaxial with the magnetic induction displacement sensor female end 14.
The upper positioning device is provided with a boss 17 on the outer side surface of the horizontal edge of the upper rigidity right-angle frame, an M6 threaded hole connected with the inelastic gravity rope 13 is arranged on the boss 17 and is fixed through a winding screw, and an adjusting gasket and an adjusting nut are arranged between the M6 threaded hole and the winding screw; the lower positioning device is provided with a clamping arc 23 on the outer side surface of the horizontal edge of the lower rigidity right-angle frame, M10 threaded holes are formed in the two sides of the clamping arc 23, and the clamping arc 23 is fixed through M10 screws.
As shown in fig. 7 and 8, a method for measuring and controlling zero displacement under cyclic elastoplastic thermal stress of a casing string comprises the following steps:
1. And determining the end point of the displacement measurement and control section of the sleeve string. According to ISO 12835 standard, calculating the length of displacement measurement and control section, using square to make one side lean against the flat end face 25 of end plug and another side lean against the sleeve string, drawing two measurement end points of displacement measurement section end point, i.e. A side (0 deg.), and drawing connecting line between two points. The index plate is placed on the upper end plug 3, the index plate is rotated 180 degrees by taking the scribing of the displacement measuring section on the side A as a reference, a straight line is scribed on the side B, and the two measuring endpoints on the side B (180 degrees) are scribed according to the calculated length of the displacement measuring section.
2. And spot welding the rigidity screw. At the four displacement measuring section end points on both sides A, B determined in step 1, the stiffness screw 8 is spot welded. During spot welding, the right angle ruler is used for leaning against the surface of the pipe body 2, and the rigidity screw 8 is observed to be vertical to the surface of the sleeve string pipe body 2.
3. And installing a heat preservation and temperature measurement device. The K-type thermocouple was spot welded at 18 temperature measuring points 42 required by ISO 12835 standard, and then the entire string was wrapped with insulation asbestos cloth 6. After installation, as shown in fig. 5.
4. And (5) hanging into a loading experiment machine. The upper end plug 3 is screwed with an upper screw rod 28, a spherical gasket B32 is penetrated into the upper screw rod 28, and the end part of the upper screw rod 28 is screwed with a hanging ring. A flat gasket 33 is placed on the lower platform 31 of the vertical loading machine 26. The hoisting ring is hoisted by a crown block, the prepared sleeve string is hoisted into the vertical loading experiment machine, the upper lead screw 28 penetrates into the hole of the upper platform 30, and the lower end plug 4 is placed on the flat gasket 33.
The lower lead screw 34 is screwed into connection with the lower end plug 4, and the spherical washer C36 is threaded into the lower lead screw 34, and the lower lead screw nut 35 is screwed until the spherical washer C is visually inspected to be in contact with the lower surface of the lower platform 31. The upper platform 30 is manually lowered until the spherical spacer B32 comes into light contact with the upper platform 30. The sling is removed, the spherical washer a27 is threaded into the upper screw 28 and the upper screw nut 29 is screwed into contact with the spherical washer a 27.
5. And adjusting the sleeve string. A tensile load of 10% of the yield of the string is added, followed by a compressive load of 10% of the yield of the string. And unloading after three times of circulation, and screwing the upper lead screw nut 29 and the lower lead screw nut 35 again until the upper lead screw nut and the lower lead screw nut are not screwed.
6. A heater is installed. The heating induction coil 7 is spirally wound outside the heat insulation asbestos cloth 6 at equal intervals, the range comprises all sleeve strings between two end plugs, and the equal interval is 200mm.
7. All components of the displacement measuring device are installed. The gaskets are penetrated on the four rigidity screws 8, and vertical side holes of the upper rigidity right-angle frame A and the lower rigidity right-angle frame A respectively penetrate into the two rigidity screws 8 on the side (0 DEG) of the sleeve string A. The vertical side holes of the upper rigidity right angle B and the lower rigidity right angle B respectively penetrate into two rigidity screws 8 on the side (180 degrees) of the sleeve string B. And adding a gasket, and screwing by using a nut. And placing the level bar on the upper transverse edge surface of the upper rigidity right angle frame A9, observing whether the transverse edge is horizontal or not, and if not, adjusting the upper rigidity right angle frame A9 until the transverse edge is horizontal. The lower rigidity right angle frame A, the upper rigidity right angle frame B and the lower rigidity right angle frame B are also used for adjusting the transverse edges to be horizontal and fixed by the method.
The winding screw 19 is sleeved with the adjusting gasket 20 and the adjusting nut 21, and is screwed into the M6 screw hole 18 of the upper rigidity right-angle bracket A9. The displacement sensor female end 14 is placed between two M10 threaded holes 22 on the horizontal side of the lower rigidity right angle frame A10, clamped by a clamping arc 23, and two M10 screws 24 are screwed down to vertically fix the displacement sensor female end 14. One end of the inelastic gravity rope 13 is fastened with the magnetic induction sensing rod 15, the other end is wound on the winding screw 19, and the magnetic induction sensing rod 15 naturally sags into the hole of the female end 14 of the displacement sensor. And measuring and observing whether the gaps between the magnetic induction sensing rod and the female end hole of the displacement sensor are equal in circumference by using a vernier caliper with the precision of 0.01mm, and if not, replacing the adjusting gasket 20 until the gaps are equal in circumference.
The upper rigidity right angle frame and the lower rigidity right angle frame of important parts in the displacement measuring device adopt spot welding rigidity screws 8 to realize the purpose of unchanged displacement measuring end points in the test process on the sleeve string pipe body. The drift distortion of other displacement sensors during tension-compression conversion is eliminated by utilizing the characteristic that the magnetic induction sensor 8 does not have resistance to detect displacement. The magnetic induction sensing rod 15 can freely move without any resistance in the female end of the magnetic induction displacement sensor by utilizing the characteristic that the loading direction of the vertical load frame loading experiment machine 26, the axis of the sleeve string and the displacement measuring direction are simultaneously perpendicular to the ground and the gravity of an object. The heating induction coils 7 are arranged at equal intervals of 200mm by adopting electric induction heating, so that a magnetic field is only generated in the sleeve string. Thereby enabling TWCCEP thermal cycle testing to be successfully performed. The problems that a displacement measurement and control system cannot timely reflect displacement repetition caused by uneven heating and a loading system cannot timely resist thermal stress change during displacement control thermal radiation and stretching/compression loading reversing are solved. After the test is completed, the load and temperature curve accords with the working condition, and the zero displacement is within the range of 0+/-0.254 mm or 0+/-0.01 in.
Taking K55 steel grade, phi 244.48 x 8.94mm specification and special buckle TP-TW sleeve string as examples, the specific implementation mode is described.
After the connection of the special buckle TP-TW sleeve string is completed on the screwing machine, the two ends are plugged by end plugs. On the surface of the tube body 2 of the sleeve string, parallel lines with the center line of the sleeve string are drawn by using a square with the end plug flat end surface 25 as a reference. And measuring 534.30mm by using the end surfaces of the two sides of the special buckle coupling 1 of the sleeve string as a reference, and determining the two end points of the displacement measurement and control section by using points on the drawn line. The index plate is then placed on the end plug and a point is marked on the other side of 180 degrees. A line parallel to the axis of the casing string is drawn on the 180 degree surface of the casing string body 2 with reference to the planar end face 25 of the same end plug. And measuring 534.3mm by using a vernier caliper, and clicking points on the drawn line to determine two endpoints of a displacement measurement and control section on the 180-degree surface of the sleeve string. And (3) determining two displacement measurement and control sections on the surfaces of 0 DEG and 180 DEG on the casing string.
The stiffness screws 8 of M20 are spot welded to the four displacement measurement endpoints on the above-identified casing string. During spot welding, the right angle ruler is used for leaning against the surface of the pipe body 2, and the rigidity screw 8 is observed to be vertical to the surface of the sleeve string pipe body 2. The four rigidity screws 8 are displacement measurement endpoints. The method ensures that the displacement is measured as the displacement of the actual casing string.
At 18 locations recommended by the ISO 12835 standard, spot-welded K-thermocouples were installed. All the strings between the two end plugs are then wrapped with glass wool insulation 6.
The upper lead screw 28 is connected with the upper end plug 3, the spherical gasket A27 is sleeved on the upper lead screw 28, and the end part of the upper lead screw 28 is screwed with a hanging ring. The above prepared casing string is loaded onto the vertical loading tester 26. When the sleeve string enters the vertical loading experiment machine 26 during installation, the sleeve string is vertically lifted, so that the sleeve string is freely hung. The casing string is then placed on the flat gasket 25 of the lower platform 30 of the vertical load machine 26 slowly, and the upper platform 30 of the vertical load machine 26 is slowly lowered so that the spherical gasket B32 is in contact with the upper platform 30 but without pressure. The spherical spacer a27 was placed on the upper platform 30 of the vertical loading machine 26 and the upper lead screw nut 35 was pre-screwed until it was in contact with the spherical spacer a 27. The lower lead screw 34 is fully connected with the lower end plug 4, and the lower lead screw nut 35 is screwed down so that the lower platform 31 is in contact with the spherical washer C36.
After installation, a tensile load of 10% yield strength is applied to the string, followed by a compressive load of 10% yield strength. After two cycles, the unloading is to zero. The upper lead screw nut 29 and the lower lead screw nut 35 are finally screwed. To this end, it is ensured that the casing string is coaxial with respect to the vertical loading tester 26, i.e. perpendicular to the ground.
The induction heating coil 7 is uniformly wound outside the heat preservation asbestos cloth 6 on the sleeve string. The spiral equidistant spacing of the winding coils is 200mm, so that the magnetic field generated on the sleeve string is uniform, and no magnetic field exists outside the coils. And detecting the absence of a magnetic field outside the coil by using a universal meter.
And a rigid right-angle frame A9 is arranged, and a gasket and a nut are sleeved on the rigid screw 8 and screwed. And penetrating a rigidity screw 8 into a vertical edge opening of the upper rigidity right-angle frame A9, and screwing and fixing the vertical edge opening by using a spring washer and a nut. The level bar is placed on the surface of the horizontal edge of the upper rigidity right angle frame A9, and whether the upper rigidity right angle frame A9 is installed horizontally or not is checked. The lower rigidity right angle frame A10, the upper rigidity right angle frame B11 and the lower rigidity right angle frame B12 are fixed at corresponding positions by the same method.
The magnetic induction displacement sensor female end 14 is installed in the clamping arc 23 of the lower rigidity right angle frame A10, and then the M10 screw 24 is fastened in the M10 threaded hole 22. The magnetic induction sensing rod 15 is fastened with the inelastic gravity rope 13, the winding screw 19 is sleeved with the adjusting gasket 20, and the adjusting gasket is screwed into the M6 threaded hole 18 of the upper rigidity right-angle frame A9. The other end of the inelastic gravity rope 13 is wound on a winding screw 19 of the upper rigidity right angle frame A9, and an adjusting nut 21 is screwed down so that the elastic gravity rope cannot slide. And (3) placing the magnetic induction sensing rod 15 into a hole at the female end 14 of the magnetic induction displacement sensor, and measuring the peripheral holes by using a vernier caliper with the precision of 0.01mm when the magnetic induction sensing rod is stationary, wherein the holes are equal. When the magnetic induction displacement sensor is uneven, the adjusting gasket 20 is replaced, so that the gaps between the magnetic induction sensing rod 15 and the magnetic induction displacement sensor female end 14 are equal.
The magnetic induction displacement sensor female end 14 and a thermocouple are connected with a communication wire 41, then connected with a Mu Ge servo controller 40, and a Mu Ge servo controller 39 is connected with a computer 40. Starting the heating equipment, starting the displacement load control software special for the computer, automatically controlling the load, and starting the test.
The test shows that the stress changes along with the temperature in the process according to the stress-along-temperature change process in ISO12835 under ten thermal cycles of 30-290 ℃ and the stress-along-temperature change curves are shown in figures 8, 9 and 10. The displacement is always controlled within 0+/-0.254 mm or 0+/-0.01 in. The well conditions of the grade 290 thermal recovery well are successfully simulated.
Claims (9)
1. A sleeve string circulation elastoplastic thermal stress lower holding zero displacement measuring device is characterized in that: the measuring device comprises a pair of upper rigidity right angle frames, a pair of lower rigidity right angle frames and a pair of measuring parts, wherein vertical edges of the upper rigidity right angle frames and the pair of lower rigidity right angle frames are symmetrically arranged on two sides of an upper sleeve and a lower sleeve of a sleeve string displacement measuring section respectively, upper positioning devices and lower positioning devices for installing the measuring parts are symmetrically arranged on the transverse edges of the upper sleeve and the lower sleeve respectively, and the measuring parts on two sides are parallel to the sleeve string displacement measuring section between the upper positioning devices and the lower positioning devices; the measuring component comprises a bulletless gravity rope, a magnetic induction displacement sensor female end and a magnetic induction sensing rod, one end of the bulletless gravity rope of the measuring component is connected to the upper positioning device, the other end of the bulletless gravity rope is bolted with the magnetic induction sensing rod, the magnetic induction sensing rod is located in an inner hole of the magnetic induction displacement sensor female end and moves freely, the magnetic induction displacement sensor female end is fixed on the lower positioning device of the lower rigidity right angle frame, and the magnetic induction sensing rod is coaxial with the magnetic induction displacement sensor female end.
2. The device for measuring zero displacement under cyclic elastoplastic thermal stress of a casing string according to claim 1, wherein the device is characterized by: the upper positioning device is provided with a boss on the outer side surface of the right-angle side, an M6 screw hole connected with the inelastic gravity rope is arranged on the boss and fixed through a screw, and an adjusting gasket is arranged between the M6 screw hole and the screw; the lower positioning device comprises a clamping arc arranged on the outer side face of the right-angle side, M10 screw holes are formed in the two sides of the clamping arc, and the clamping arc is fixed through M10 screws.
3. The device for measuring zero displacement under cyclic elastoplastic thermal stress of a casing string according to claim 1, wherein the device is characterized by: the right angle frames with upper and lower rigidities are made of 35CrMo materials.
4. The device for measuring zero displacement under cyclic elastoplastic thermal stress of a casing string according to claim 1, wherein the device is characterized by: the perpendicularity of the vertical edge and the horizontal edge of the upper and lower rigidity right-angle frames is 0.1mm.
5. The device for measuring zero displacement under cyclic elastoplastic thermal stress of casing string according to claim 4, wherein the device comprises: the equidistant tolerance of the two hole centers of the lateral screw holes of the lateral side of the lower rigidity right angle frame to the surface of the lateral side of the lower rigidity right angle frame is within +/-0.10 mm.
6. The device for measuring zero displacement under cyclic elastoplastic thermal stress of casing string according to claim 4, wherein the device comprises: the height of the boss on the transverse side of the upper rigidity right-angle frame is-2 mm of the outer radius of the female end of the displacement sensor.
7. The device for measuring zero displacement under cyclic elastoplastic thermal stress of casing string according to claim 2, wherein the device is characterized by: the thickness of the adjusting gasket is 0.05mm, 0.1mm, 0.5mm, 0.8mm or 1.0mm, and the adjusting gasket is used for adjusting concentricity of the magnetic induction sensing rod and the magnetic induction displacement sensor female end.
8. A method of measuring and controlling a device for measuring zero displacement under cyclic elastoplastic thermal stress of a casing string according to claim 1, comprising the steps of:
step one: installing a measuring device: the sleeve string circulation elastoplastic thermal stress zero displacement measurement device is arranged on a vertical loading experiment machine, and the gravity of the vertical loading frame, the sleeve string and the magnetic induction sensing rod is vertical to the ground;
step two: simulation heating: electric induction heating is selected, heating induction coils are spirally arranged on the sleeve string at equal intervals of 200mm, and a magnetic field is only generated in the sleeve string;
Step three: measurement: the measurement and control system adopts a multichannel control loop with the iteration rate of 2.5KHz and a Mu Ge servo controller with a unique control closed-loop technology, so that the impact-free smooth loading of displacement control load is realized;
step four: data transfer: in the heating and cooling process, the displacement of the displacement measuring section changes, the magnetic induction sensing rod moves in the female end of the magnetic induction displacement sensor, a change signal is transmitted to the Mu Ge servo controller, and after the computer software collects information, the vertical loading experiment machine loads the sleeve string, so that the sleeve string always keeps zero displacement.
9. The method for measuring the zero displacement of the sleeve string under the cyclic elastoplastic thermal stress, which is disclosed in claim 8, is characterized in that: the precision of the magnetic induction displacement sensor is 0.01mm; the thermocouple is of a K-type welding type; the gap between the magnetic induction sensing rod and the magnetic induction sensor female end hole is equal in circumference by measuring with a vernier caliper with the precision of 0.01 mm.
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