CN212748586U - Device for measuring integrity of casing damaged by alternating internal pressure of casing - Google Patents
Device for measuring integrity of casing damaged by alternating internal pressure of casing Download PDFInfo
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- CN212748586U CN212748586U CN202021411246.5U CN202021411246U CN212748586U CN 212748586 U CN212748586 U CN 212748586U CN 202021411246 U CN202021411246 U CN 202021411246U CN 212748586 U CN212748586 U CN 212748586U
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Abstract
The utility model provides a measure device that interior pressure of sleeve pipe reversal destroyed cement sheath integrality, including kettle cover, sleeve pipe upper cover, sleeve pipe, cement sheath, rubber tube, metal covering, kettle body annular space, the cauldron body, sleeve pipe lower cover, test scurry gas injection mouth, sleeve pipe bottom entry, cauldron body outlet, test scurry air inlet, thermocouple, cauldron body water inlet, scurry gas export, sleeve pipe upper cover gas vent. The cauldron is internal, and sleeve pipe, cement sheath, rubber tube, metal covering, cauldron body annular space from interior to exterior install in proper order, and the sleeve pipe upper cover lid is at the top of sleeve pipe and cement sheath, and the blowby gas export sets up inside the sleeve pipe upper cover, and blowby gas export one end corresponds the cement sheath, and other end intercommunication sleeve pipe upper cover middle part through-hole is equipped with the sleeve pipe upper cover gas vent in the through-hole of sleeve pipe upper cover middle part, and the cauldron lid closes on the cauldron body. The utility model is used for under the simulation stratum high temperature high pressure environment, the inside influence to the well cementation cement sheath integrality under alternating load of test sleeve.
Description
Technical Field
The utility model belongs to the technical field of oil gas exploration, especially, relate to a device for measuring pressure in sleeve pipe reversal and destroying cement sheath integrality.
Background
In the drilling and completion and subsequent production processes, if the integrity of the cement sheath is seriously failed, the safety of a shaft, the development capacity and the environmental pollution are influenced. Under the operation of casing pipe high internal pressure, must can lead to the fact destruction to a certain extent to cement sheath integrality, can cause the well head annular space to press when serious, influence oil gas well life-span. At present, the integrity of the cement sheath is mainly researched by focusing on the analysis of a theoretical model and finite element simulation, and the research and the analysis through an indoor test simulation device are less, and the consideration of the experiment factors is single.
Therefore, a relatively complete device for testing the integrity of the cement sheath damaged by the alternating internal pressure of the casing is needed to perform experimental research on the influence of the internal pressure of the casing on the integrity of the cement sheath and verification of a theoretical calculation model.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve the defect that above-mentioned prior art exists, provide a measure sheathed tube device for under the simulation stratum high temperature high pressure environment, the influence of well cementation cement sheath uninstallation ability to the anti outer crowded ability of sleeve pipe under test even load and the inhomogeneous load.
The utility model adopts the following technical scheme:
the utility model provides a device for measuring pressure destruction cement sheath integrality in sleeve pipe reversal, includes kettle cover, sleeve pipe upper cover, sleeve pipe, cement sheath, rubber tube, metal covering, cauldron body annular space, the cauldron body, sleeve pipe lower cover, tests scurries the gas injection mouth, sleeve pipe bottom entry, cauldron body outlet, tests scurries air inlet, thermocouple, cauldron body water inlet, scurries the gas export, sleeve pipe upper cover gas vent.
The device comprises a kettle body annular inlet valve, a kettle body pressure gauge, a pneumatic liquid booster pump, a water inlet valve, a booster valve I, a pressure relief valve, a pressure relief pump, a high-pressure relief valve, a sleeve valve, a kettle body annular outlet valve, a channeling checking outlet valve, a sealed water tank, an electronic balance, a pressure relief valve, a pressure measuring inlet valve, a channeling checking pressure gauge, a channeling checking pressure regulator, a gas pneumatic booster pump and a booster valve II.
The cauldron is internal, and sleeve pipe, cement sheath, rubber tube, metal covering, cauldron body annular space from interior to exterior install in proper order, and the sleeve pipe upper cover lid is at the top of sleeve pipe and cement sheath, and the blowby gas export sets up inside the sleeve pipe upper cover, and blowby gas export one end corresponds the cement sheath, and other end intercommunication sleeve pipe upper cover middle part through-hole is equipped with the sleeve pipe upper cover gas vent in the through-hole of sleeve pipe upper cover middle part, and the cauldron lid closes on the cauldron body.
The side wall of the kettle body is sequentially provided with a kettle body water inlet, a thermocouple and a kettle body water outlet from top to bottom.
The sleeve pipe lower cover is installed in the bottom of sleeve pipe and cement sheath, tests to scurry the air inlet setting inside the sleeve pipe lower cover, and its one end corresponds with the cement sheath, and the other end setting is provided with in the internal diapire of cauldron on cauldron bottom, inner wall and tests to scurry the gas injection mouth, is equipped with sleeve pipe bottom entry in the middle part through-hole of sleeve pipe lower cover.
The sleeve pipe upper cover gas vent links to each other with connecting pipe an one end, and the connecting pipe an other end links to each other with test outlet valve one end, tests the outlet valve other end and links to each other with connecting pipe b one end, and the one end at sealed water tank is installed to the connecting pipe b other end, and sealed water tank's the other end links to each other with connecting pipe c's one end, and connecting pipe c's the other end is connected with electronic balance.
The cauldron body water inlet on the cauldron body links to each other with connecting pipe d one end, the connecting pipe d other end links to each other with cauldron body annular space import valve, cauldron body annular space import valve other end links to each other with connecting pipe e one end, connecting pipe e links to each other with connecting pipe (f, g) respectively, the other end of connecting pipe g links to each other with the one end of pressure release pump, the connecting pipe e other end is installed on pneumatic gas booster pump, the second end of gas booster pump meets with the water source through connecting pipe h, the water intaking valve is installed on connecting pipe h, the third end of gas booster pump links to each other with connecting pipe i one end, the connecting pipe i.
Kettle body outlet passes through connecting pipe j and links to each other with kettle body annulus outlet valve one end, kettle body annulus outlet valve other end links to each other with connecting pipe k, sleeve pipe bottom entry passes through connecting pipe l and links to each other with sleeve valve one end, the sleeve valve other end links to each other with connecting pipe m one end, connecting pipe m and connecting pipe (f, k) other end link to each other, the other end of connecting pipe m links to each other with the one end of high-pressure relief valve, the other end of high-pressure relief valve links to each other with connecting pipe n, connecting pipe n links to each other with connecting pipe o one end, the connecting pipe o other end links to each other with the second end of pressure relief pump, the other end of connecting pipe n is the outlet, the third end of pressure relief pump links to each other with connecting pipe p, the other with the one end of relief.
Check and scurry the gas injection mouth through connecting pipe s and pressure release valve one end, pressure measurement import valve one end links to each other, pressure measurement import valve other end connection connecting pipe t one end, the connecting pipe t other end links to each other with checking the pressure regulator that scurries, it installs on connecting pipe t to check the pressure gauge, it links to each other with connecting pipe u one end to check the pressure regulator other end, the connecting pipe u other end links to each other with gaseous pneumatic booster pump one end, gaseous pneumatic booster pump second end passes through connecting pipe v and links to each other with the nitrogen gas source, gaseous pneumatic booster pump third end links to each other with connecting pipe w one end, the connecting pipe w other end links to each other with II one ends of booster valve, II other ends of booster valve.
The further technical scheme is that the middle part of the kettle cover is provided with a round hole, the round hole in the middle part is matched with a wall body of a through hole in the middle part of the sleeve upper cover, and the covered bottom surface is matched with the top surface of the lower part of the sleeve upper cover, the top surface of the rubber pipe, the top surface of the metal sleeve and the top surface of the kettle annular space. The device is used for detecting whether gas is blown out through a sleeve-cement sheath cementing surface, a cement sheath-rubber cementing surface and a cement sheath internal gap at the top so as to judge whether the integrity of the cement sheath is damaged.
The technical scheme is that the lower wall body of the lower sleeve cover is matched with the bottom wall body of the kettle body, the bottom surface of the middle wall body of the lower sleeve cover is matched with the inner wall of the bottom of the kettle body, the side surface of the middle wall body of the lower sleeve cover is matched with the side surface of the rubber pipe, and the top surface of the middle wall body of the lower sleeve cover is matched with the bottom surface of the sleeve and the bottom surface of the cement sheath. The device is used for introducing pressurized gas into the cement sheath to verify the integrity of the cement sheath.
And a method of measuring the internal pressure of a casing, comprising the steps of:
step 1, assembling and installing the casing, the rubber pipe, the metal sleeve, the casing upper cover, the casing lower cover and the bottom sealing rubber ring from inside to outside to ensure the complete sealing performance, dropping the assembled casing, the bottom sealing rubber ring into a kettle body, injecting prepared cement slurry into an interlayer formed by the casing and the rubber pipe through a cement slurry injection port in the casing upper cover, and installing the top sealing ring rubber ring and covering the kettle cover 1 at one time.
And 2, injecting water into the kettle body through a water inlet of the kettle body, raising the temperature of the water to corresponding working temperature through a thermocouple after the space formed by the kettle body and the metal sleeve is filled with the injected water, and adjusting the temperature and the pressure to target temperature and pressure through program setting. And curing the cement ring for a target time to cure the cement into a cement ring in an interlayer formed by the sleeve and the rubber pipe. Because the pressure of the kettle body is continuously increased in the temperature rise process, the pressure relief pump needs to be opened to timely relieve the pressure.
And 3, opening a high-pressure release valve after the cement is formed into a ring, opening a sleeve valve of the kettle body after the pressure of the kettle body is released, draining water in the kettle body, then opening a water inlet valve in the sleeve, overflowing the water from the upper cover of the sleeve, and screwing the upper cover of the sleeve to form a screwed plug. Connect the sleeve pipe lower cover pressure boost pipeline, set up the fracturing procedure, through constantly pressurizeing the step-down to the intraductal, reach the effect of simulation fracturing operation. And after the fracturing is finished, discharging the pressure in the casing pipe, and draining the water in the casing pipe.
And 4, connecting the exhaust port of the upper cover of the sleeve, opening the channeling exit valve, wherein nitrogen can overflow from the channeling exit valve, if the cementing quality of the cement sheath is damaged or the cement sheath is broken, gas can overflow from the exhaust port of the sleeve of the upper cover of the sleeve, and the amount of the gas can be known according to the amount of water to be discharged. By comparing the amount of gas in a unit time, the cementing degree of the cement sheath and the crushing degree of the cement sheath can be known.
The further technical scheme is that the test device is sequentially designed according to the concentricity of the center of the lower cover of the sleeve and the center of the through hole in the middle of the lower cover of the sleeve which is respectively 30 percent, 67 percent and 100 percent and is used for testing the internal pressure of the sleeve.
The method for measuring the internal pressure of the casing comprises three parts:
firstly, a cement sheath maintenance process:
the experimental mold, namely the lower cover of the sleeve, the rubber tube and the metal sleeve (double semicircular cylinder sleeve) is assembled. Note that, in order to meet the requirements of the field, three different concentrations (different concentrations are achieved by installing different sleeve upper and lower cover molds and changing different positions of the sleeve) are designed, namely 100% of the concentration, 67% of the concentration and 30% of the concentration. After the maintenance mold is assembled, the mold falls into the kettle body through a crane. Pouring cement slurry into the annular space between the casing and the rubber tube, and covering the upper cover of the casing after the annular space is filled with the cement slurry. And covering the kettle cover, injecting water into the kettle body, and setting the temperature and the pressure of the kettle body after the kettle body is full of water until the maintenance is finished.
Second, fracturing experiment
1. And (4) fracturing the water switch, injecting water into the sleeve, overflowing from the upper cover of the sleeve after the sleeve is full of water, and screwing the upper cover of the sleeve to form a screwed plug.
2. Connect the sleeve pipe lower cover pressure boost pipeline, set up the fracturing procedure, through constantly pressurizeing and stepping down in to sleeve pipe 3, reach the effect of simulation fracturing.
3. And after the fracturing is finished, discharging the pressure in the casing pipe, and draining the water in the casing pipe.
Third, channeling test
1. Connecting sleeve pipe upper cover exhaust interface opens the blowby valve, and nitrogen gas can spill over from the blowby valve this moment, if cement sheath cementation quality takes place to destroy or the cement sheath is broken, and gas can spill over from the exhaust interface of sleeve pipe upper cover, through the volume of discharging, can know how much gas spills over. Comparing the gas amount, the cementing degree of the cement sheath and the crushing degree of the cement sheath can be known.
The utility model has the advantages that:
the internal pressure resistance and the external extrusion resistance of the casing may be reduced after multiple internal pressure actions under the action of multiple volume pressure fracturing. It is known that the effect of increasing the production causes an alternating internal pressure inside the casing. It is possible that the integrity of the cement sheath is compromised resulting in a reduction in the crush resistance of the casing. The main function of the method is to determine the physical properties of cement sheath with different centering degrees under the action of alternating internal pressure. And simultaneously, the cementing degree of the cement ring and whether gas channeling occurs can be tested.
The utility model discloses a to the intraductal pressure release that pressurizes repeatedly of cover to reach the effect of simulation stratum fracturing. During repeated pressurization and depressurization, the sleeve can deform, so that a cement sheath can be affected, and the cement sheath can be broken or broken. And at the moment, the lower part of the casing cement sheath is ventilated, and the cementing degree of the cement sheath and whether the cement sheath is broken or not are judged according to the air output.
Drawings
FIG. 1 is a schematic view of the internal structure of the kettle body device of the present invention;
FIG. 2 is a schematic diagram of the pipeline of the present invention;
FIG. 3 is a schematic diagram of the pipeline branching during maintenance;
FIG. 4 is a schematic diagram of a bypass of an internal pressure process line;
FIG. 5 is a schematic diagram of a pipeline shunt during a channeling process.
In the figure: 1-kettle cover, 2-sleeve upper cover, 3-sleeve, 4-cement sheath, 5-rubber tube, 6-metal sheath, 7-kettle annular space, 8-kettle, 9-sleeve lower cover, 10-channeling checking gas injection port, 11-sleeve bottom inlet, 12-kettle water outlet, 13-channeling checking gas inlet, 14-thermocouple, 15-kettle water inlet, 16-channeling gas outlet and 17-sleeve upper cover gas outlet;
18-kettle body annular inlet valve, 19-kettle body pressure gauge, 20-pneumatic liquid booster pump, 21-water inlet valve, 22-booster valve I, 23-pressure relief valve, 24-pressure relief pump, 25-high pressure relief valve, 26-sleeve valve, 27-kettle body annular outlet valve, 28-channeling checking outlet valve, 29-sealed water tank, 30-electronic balance, 31-pressure relief valve, 32-pressure measuring inlet valve, 33-channeling checking pressure gauge, 34-channeling checking pressure regulator, 35-gas pneumatic booster pump and 36-booster valve II.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention are clearly and completely described below, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1 and 2, the utility model discloses a device for measuring interior pressure of sleeve pipe alternation and destroying cement sheath integrality, including kettle cover 1, sleeve pipe upper cover 2, sleeve pipe 3, cement sheath 4, rubber tube 5, metal covering 6, kettle body annular space 7, kettle body 8, sleeve pipe lower cover 9, test scurries gas injection mouth 10, sleeve pipe bottom entry 11, kettle body outlet 12, test scurries air inlet 13, thermocouple 14, kettle body water inlet 15, scurries gas export 16, sleeve pipe upper cover gas vent 17.
The device comprises a kettle body annular inlet valve 18, a kettle body pressure gauge 19, a pneumatic liquid booster pump 20, a water inlet valve 21, a booster valve I22, a pressure release valve 23, a pressure release pump 24, a high-pressure release valve 25, a sleeve valve 26, a kettle body annular outlet valve 27, a channeling checking outlet valve 28, a sealed water tank 29, an electronic balance 30, a pressure release valve 31, a pressure measuring inlet valve 32, a channeling checking pressure gauge 33, a channeling checking pressure regulator 34, a gas pneumatic booster pump 35 and a booster valve II 36.
In the cauldron body 8, from interior to exterior install sleeve pipe 3 in proper order, cement sheath 4, rubber tube 5, metal covering 6, cauldron body annular space 7, 2 lids of sleeve pipe upper cover are at the top of sleeve pipe 3 and cement sheath 4, blowby gas export 16 sets up inside 2 lids of sleeve pipe, 16 one end of blowby gas export corresponds cement sheath 4, 2 middle part through-holes of other end intercommunication sleeve pipe upper cover, be equipped with sleeve pipe upper cover gas vent 17 in 2 middle part through-holes of sleeve pipe upper cover, 1 approximately of cauldron lid closes on cauldron body 1, 1 middle part of cauldron lid has the round hole, the round hole at middle part and the side wall body cooperation of 2 middle part through-holes of sleeve pipe upper cover, bottom surface and 2 lower part top surfaces of sleeve pipe upper cover, 5 top surfaces of rubber tube, 6 top surfaces of metal covering, 7 top surfaces of.
The side wall of the kettle body 8 is sequentially provided with a kettle body water inlet 15, a thermocouple 14 and a kettle body water outlet 12 from top to bottom.
The bottom at sleeve pipe 3 and cement ring 4 is installed to sleeve pipe lower cover 9, it sets up inside sleeve pipe lower cover 9 to test scurries air inlet 13, its one end corresponds with cement ring 4, the other end sets up in cauldron body bottom, on the inner wall, and be close to cauldron body bottom, the gas injection mouth 10 is scurried in testing that sets up in the inner wall, the middle part through-hole of sleeve pipe lower cover 9 is equipped with sleeve pipe bottom entry 11, 2 lower part wall bodies of sleeve pipe lower cover cooperate with 8 bottom wall bodies of cauldron body, the cooperation of the middle part wall body bottom surface and the cauldron body bottom inner wall of sleeve pipe lower cover 9, the cooperation of the middle part wall body side and rubber tube 5 side of sleeve pipe lower cover 9, 9 middle part wall body top surfaces of sleeve pipe lower cover.
The sleeve pipe upper cover gas vent 17 links to each other with connecting pipe an one end, and the connecting pipe an other end links to each other with test outlet valve 28 one end, tests the outlet valve 28 other end and links to each other with connecting pipe b one end, and the one end at sealed water tank 29 is installed to the connecting pipe b other end, and sealed water tank 29's the other end links to each other with the one end of connecting pipe c, and the other end of connecting pipe c is connected with electronic balance 30.
Kettle body water inlet 15 on the kettle body 8 links to each other with connecting pipe d one end, the connecting pipe d other end links to each other with kettle body annular inlet valve 18, kettle body annular inlet valve 18 other end links to each other with connecting pipe e one end, connecting pipe e links to each other with connecting pipe (f, g) respectively, the other end of connecting pipe g links to each other with the one end of pressure release pump 24, the connecting pipe e other end is installed on pneumatic gas booster pump 20, kettle body manometer 19 is installed on connecting pipe e, the second end of gas booster pump 20 meets through connecting pipe h with the water source, water intaking valve 21 is installed on connecting pipe h, the third end of gas booster pump 20 links to each other with connecting pipe i one end, the connecting pipe i other end.
Channeling gas injection mouth 10 is through connecting pipe s and 31 one end of pressure release valve, pressure measurement import valve 32 one end links to each other, connecting pipe t one end is connected to the pressure measurement import valve 32 other end, the connecting pipe t other end links to each other with channeling pressure regulator 34, channeling pressure gauge 33 is installed on connecting pipe t, channeling pressure regulator 34 other end links to each other with connecting pipe u one end, the connecting pipe u other end links to each other with gaseous pneumatic booster pump 35 one end, gaseous pneumatic booster pump 35 second end passes through connecting pipe v and links to each other with the nitrogen gas source, gaseous pneumatic booster pump 35 third end links to each other with connecting pipe w one end, the connecting pipe w other end links to each other with II 36 one end of booster valve, II 36 other ends of booster valve link to each other with connecting pipe x one.
A method of measuring internal pressure of a casing comprising the steps of:
step 1, assembling and installing a casing 3, a rubber pipe 5, a metal sleeve 6, a casing upper cover 2, a casing lower cover 9 and a bottom sealing rubber ring from inside to outside to ensure the sealing performance is good, after the assembling, dropping the assembled casing lower cover and the bottom sealing rubber ring into a kettle body 8, injecting prepared cement slurry into an interlayer formed by the casing 3 and the rubber pipe 5 through a cement slurry injection port in the casing upper cover 2, and installing a top sealing ring rubber ring and an upper kettle cover 1 at one time.
And 2, injecting water into the kettle body 8 through the kettle body water inlet 15, and raising the temperature of the water to a corresponding working temperature through the thermocouple 14 after the injected water is filled in a space formed by the kettle body 8 and the metal sleeve 6, wherein the temperature and the pressure can be adjusted to a target temperature and a target pressure through program setting. The cement ring 4 is cured for a target time so that the cement is cured into the cement ring 4 in the interlayer formed by the casing 3 and the rubber tube 3. Because the pressure of the kettle body 8 is continuously increased in the temperature rise process, the pressure relief pump 24 needs to be opened to timely relieve the pressure.
And 3, after the cement is subjected to ring formation, opening a high-pressure release valve 25, after the pressure of the kettle body 8 is released, opening a sleeve valve 26 of the kettle body 8, draining the water in the kettle body 8, then opening a water inlet valve 21 in the sleeve 3, overflowing the water from the sleeve upper cover 2, and screwing the sleeve upper cover 2 to form a screwed plug. Connect the 9 pressure boost pipelines of sleeve pipe lower cover, set up the fracturing procedure, through constantly pressurizeing the step-down to the intraductal, reach the effect of simulation fracturing operation. After fracturing is finished, the pressure in the casing 3 is discharged, and water in the casing 3 is drained.
And 4, connecting the sleeve upper cover exhaust port 17, opening the channeling check outlet valve 28, wherein nitrogen can overflow from the channeling check outlet valve 28, if the cementing quality of the cement sheath is damaged or the cement sheath is broken, gas can overflow from the sleeve exhaust port 17 of the sleeve upper cover 2, and the overflow of the gas can be known according to the amount of water to be drained. By comparing the amount of gas per unit time, the degree of cementation of the cement sheath 4 and the degree of fracture of the cement sheath 4 can be known.
When the device for measuring the integrity of the casing damaged by the alternating internal pressure of the casing is in a maintenance state, as shown in figure 3, the structure is as follows:
the cauldron body water inlet 15 of the cauldron body 8 links to each other with cauldron body annular space import valve 18 one end through connecting pipe d, cauldron body annular space import valve 18 other end links to each other with connecting pipe e one end, connecting pipe e links to each other with connecting pipe (f, g) respectively, the other end of connecting pipe g links to each other with the one end of pressure release pump 24, the connecting pipe e other end is installed on pneumatic gas booster pump 20, cauldron body manometer 19 is installed on connecting pipe e, pneumatic gas booster pump 20 second end links to each other with the water source through connecting pipe h, water intaking valve 21 is installed on connecting pipe h, the third end of gas booster pump 20 links to each other with connecting pipe i one end, the connecting pipe i other end links.
And (3) a maintenance process: (all valves are closed before operation)
The method comprises the following steps: opening a water inlet valve 21 and a kettle body annular inlet valve 18, and filling the kettle body annular 7 with water;
step two: closing the water inlet valve 21, opening the pressure increasing valve I22, pressurizing the annular space 7 of the kettle body by gas through the pneumatic liquid pressure increasing pump 20 until the pressure shown by the pressure gauge 19 of the kettle body reaches the set pressure, and closing the pressure increasing valve I22 to provide the simulated pressure for the curing cement ring 4;
step three: the thermocouple 14 is arranged to heat water in the annular space of the kettle body to a set temperature so as to provide simulated pressure for the curing cement ring 4;
step four: after the maintenance is finished, the high-pressure release valve 25 and the pressure release valve 23 are opened to release the maintenance high pressure of the kettle body annular space 7, after the pressure is released, the pressure release valve 23 is closed and the kettle body annular space outlet valve 27 is opened, the water in the kettle body annular space 7 is discharged, and the maintenance process is finished.
Secondly, as shown in fig. 4, when the device in the measuring sleeve is in the process of internal pressure:
connecting pipe l is installed at one end of a sleeve bottom inlet 11 at the bottom of the kettle body 8, a sleeve valve 26 is installed at the other end of the connecting pipe I, a connecting pipe m is installed at the other end of the sleeve valve 26, the connecting pipe m is connected with one end of a connecting pipe f, a high-pressure release valve 25 is connected to the other end of the connecting pipe m, the connecting pipe f is connected with a connecting pipe e, the connecting pipe e is connected with a connecting pipe g, the other end of the connecting pipe e is connected with one end of a pneumatic liquid booster pump 20, a kettle body pressure gauge 19 is installed on the connecting pipe e, the second end of the pneumatic liquid booster pump 20.
The third end of the pneumatic liquid booster pump 20 is connected with one end of a booster valve I22, and the other end of the booster valve I22 is connected with a connecting pipe r.
The other end of the high-pressure release valve 25 is connected with a connecting pipe n, the connecting pipe n is connected with one end of a connecting pipe o, the other end of the connecting pipe o is connected with the second end of the pressure relief pump 24, the other end of the connecting pipe n is a water outlet, the third end of the pressure relief pump 24 is connected with a connecting pipe p, the other end of the connecting pipe p is connected with the pressure relief valve 23, the other end of the pressure relief valve 23 is connected with a connecting pipe q, the other end of the connecting pipe. And (3) an internal pressure process: (all valves are closed before operation)
The method comprises the following steps: opening the water inlet valve 21 and the sleeve valve 26, injecting water into the sleeve 3 until water overflows from the exhaust port 17 of the upper cover of the sleeve, and blocking the sleeve by using a plug;
step two: closing the water inlet valve 21, then opening the pressurization valve I22, pressurizing the sleeve 3, maintaining for a period of time, then opening the high-pressure release valve 25 and the pressure release valve 23, releasing partial pressure, and maintaining for a period of time, so as to repeatedly pressurize and release the sleeve 3, thereby achieving the effect of simulating internal pressure;
step three: after the test is finished, the whole pressure of the sleeve 3 is released, and the water in the sleeve 3 is discharged.
And thirdly, as shown in figure 5, when the device for measuring the integrity of the cement sheath destroyed by the alternating internal pressure of the casing is in the process of channeling test:
the sleeve pipe upper cover gas vent 17 links to each other with connecting pipe an one end, and the connecting pipe an other end links to each other with test outlet valve 28 one end, tests the outlet valve 28 other end and links to each other with connecting pipe b one end, and the one end at sealed water tank 29 is installed to the connecting pipe b other end, and sealed water tank 29's the other end links to each other with the one end of connecting pipe c, and the other end of connecting pipe c is connected with electronic balance 30.
Channeling gas injection mouth 10 is through connecting pipe s and 31 one end of pressure release valve, pressure measurement import valve 32 one end links to each other, connecting pipe t one end is connected to the pressure measurement import valve 32 other end, the connecting pipe t other end links to each other with channeling pressure regulator 34, channeling pressure gauge 33 is installed on connecting pipe t, channeling pressure regulator 34 other end links to each other with connecting pipe u one end, the connecting pipe u other end links to each other with gaseous pneumatic booster pump 35 one end, gaseous pneumatic booster pump 35 second end passes through connecting pipe v and links to each other with the nitrogen gas source, gaseous pneumatic booster pump 35 third end links to each other with connecting pipe w one end, the connecting pipe w other end links to each other with II 36 one end of booster valve, II 36 other ends of booster valve link to.
And (3) channeling checking process: (all valves are closed before operation)
The method comprises the following steps: opening a pressure measuring inlet valve 32, and injecting nitrogen into the kettle channeling gas injection port 10;
step two: opening a pressure increasing valve II 36, increasing the pressure of the kettle channeling checking gas injection port 10 through a gas pneumatic pressure increasing pump 35, and setting channeling checking pressure by using a channeling checking pressure regulator 34 until a channeling checking pressure gauge 33 displays a required set value;
step three: opening the outlet check valve 28, allowing the blow-by gas to enter the sealed water tank 29, and collecting and weighing the discharged water by an electronic balance 30, so as to know the gas overflow amount;
step four: after the channeling test is finished, the nitrogen gas source is closed, the kettle body 8 is disassembled, the test sample in the kettle body 8 is removed and recycled, and the whole equipment is cleaned up.
Example (b):
the experimental equipment can be used for testing the damage degree of the casing to the cement sheath under different alternating internal pressures, can be used for alternating internal pressure experiments according to different centering degrees, different fracturing pressure differences and different fracturing times, and can be provided with an experiment contrast group to ensure the reliability of experimental data.
Take the casing centering degree of 67%, consider the differential pressure of 40MPa, fracture the fracturing experiment for 20 times as an example.
1. Curing the cement sheath: and (4) checking the equipment to ensure that the equipment normally operates, closing all switches and configuring cement slurry required by the experiment. The method comprises the following steps of assembling and installing a sleeve 3, a rubber pipe 5, a metal sleeve 6, a sleeve upper cover 2, a sleeve lower cover 9 and a bottom sealing rubber ring according to a mode from inside to outside, enabling the sleeve 3 to correspond to a position with the centering degree of 67%, after the assembly, enabling the sleeve 3 to fall into a kettle body 8, injecting prepared cement slurry into an interlayer formed by the sleeve 3 and the rubber pipe 5 through a cement slurry injection port in the sleeve upper cover 2, and installing the top sealing ring rubber ring and covering the kettle cover 1 at one time. Water is injected into the kettle body 8 through the kettle body water inlet 15, when the injected water is filled in a space formed by the kettle body 8 and the metal sleeve 6, the temperature of the water is raised to 90 ℃ through the thermocouple 14, and the temperature and the pressure can be adjusted to 90 ℃ and 20.7MPa through program setting. The cement ring 4 is cured for a target time so that the cement is cured into the cement ring 4 in the interlayer formed by the casing 3 and the rubber tube 3. Because the pressure of the kettle body 8 is continuously increased in the temperature rise process, the pressure relief pump 24 needs to be opened to timely relieve the pressure.
2. Fracturing experiments: after cement curing is performed to form a ring, the high-pressure release valve 25 is opened, after the pressure of the kettle body 8 is released, the sleeve valve 26 of the kettle body 8 is opened, water in the kettle body is drained, then the water inlet valve 21 in the sleeve 3 is opened, the water overflows from the sleeve upper cover 2, and the sleeve upper cover 2 is screwed tightly to form a plug. The lower cover 9 of the sleeve is connected with a pressurization pipeline, a fracturing program is set, the pressure difference of the sleeve reaches 40MPa required by the experiment by continuously pressurizing and depressurizing the sleeve, and the pressurizing and depressurizing process is carried out for 20 times required by the experiment. After fracturing is finished, the pressure in the casing 3 is discharged, and water in the casing 3 is drained. And taking out the cement sheath test piece after the whole experiment is finished.
3. Channeling test: the casing upper cover vent 17 is connected, the channeling exit valve 28 is opened, the water discharge amount of the sealed water tank 15 is measured by the electronic balance 16, and the gas overflowing amount from the casing vent 17 of the casing upper cover 2 through the cement sheath crack can be known. By comparing the amount of gas per unit time, the degree of cementation of the cement sheath 4 and the degree of fracture of the cement sheath 4 can be known. After the experiment is finished, the cement sheath assembly is taken out, the cement sheath is found to be longitudinally cracked, the cementation is completely damaged, and the larger the obtained gas overflow amount is, the more serious the damage is.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (4)
1. A device for measuring the integrity of a cement sheath damaged by alternating internal pressure of the sheath comprises a kettle cover, a sheath upper cover, a sheath, the cement sheath, a rubber pipe, a metal sleeve, a kettle body annular space, a kettle body, a sheath lower cover, a channeling checking gas injection port, a sheath bottom inlet, a kettle body water outlet, a channeling checking gas inlet, a thermocouple, a kettle body water inlet, a channeling gas outlet and a sheath upper cover gas outlet;
the device comprises a kettle body annular inlet valve, a kettle body pressure gauge, a pneumatic liquid booster pump, a water inlet valve, a booster valve I, a pressure relief valve, a pressure relief pump, a high-pressure release valve, a sleeve valve, a kettle body annular outlet valve, a channeling checking outlet valve, a sealed water tank, an electronic balance, a pressure release valve, a pressure measuring inlet valve, a channeling checking pressure gauge, a channeling checking pressure regulator, a gas pneumatic booster pump and a booster valve II, and is characterized in that the device comprises a kettle body annular inlet valve, a kettle body pressure;
in the kettle body, a sleeve, a cement sheath, a rubber pipe, a metal sleeve and a kettle body annular space are sequentially installed from inside to outside, an upper cover of the sleeve is covered on the top of the sleeve and the cement sheath, a blow-by gas outlet is arranged in the upper cover of the sleeve, one end of the blow-by gas outlet corresponds to the cement sheath, the other end of the blow-by gas outlet is communicated with a through hole in the middle of the upper cover of the sleeve, an exhaust port of the upper cover of the sleeve is arranged in the through hole in the middle of the upper cover of;
a kettle body water inlet, a thermocouple and a kettle body water outlet are sequentially arranged on the side wall of the kettle body from top to bottom;
the lower cover of the sleeve is arranged at the bottom of the sleeve and the cement sheath, the channeling checking air inlet is arranged in the lower cover of the sleeve, one end of the channeling checking air inlet corresponds to the cement sheath, the other end of the channeling checking air inlet is arranged at the bottom and on the inner wall of the kettle body, a channeling checking air injection port is arranged in the bottom wall of the kettle body, and an inlet at the bottom of the sleeve is arranged in a through hole in the middle of the;
the exhaust port of the upper cover of the sleeve is connected with one end of a connecting pipe a, the other end of the connecting pipe a is connected with one end of a channeling check outlet valve, the other end of the channeling check outlet valve is connected with one end of a connecting pipe b, the other end of the connecting pipe b is installed at one end of a sealed water tank, the other end of the sealed water tank is connected with one end of a connecting pipe c, and the other end of the connecting pipe c is connected;
a kettle body water inlet on the kettle body is connected with one end of a connecting pipe d, the other end of the connecting pipe d is connected with a kettle body annular inlet valve, the other end of the kettle body annular inlet valve is connected with one end of a connecting pipe e, the connecting pipe e is respectively connected with connecting pipes (f and g), the other end of the connecting pipe g is connected with one end of a pressure relief pump, the other end of the connecting pipe e is arranged on a pneumatic gas booster pump, the second end of the gas booster pump is connected with a water source through a connecting pipe h, a water inlet valve is arranged on the connecting pipe h, the third end of the gas booster pump is connected with one end of a connecting;
the kettle body water outlet is connected with one end of a kettle body annular outlet valve through a connecting pipe j, the other end of the kettle body annular outlet valve is connected with a connecting pipe k, an inlet at the bottom of a sleeve is connected with one end of a sleeve valve through a connecting pipe l, the other end of the sleeve valve is connected with one end of a connecting pipe m, the other end of the connecting pipe m is connected with the other end of a connecting pipe (f, k), the other end of the connecting pipe m is connected with one end of a high-pressure release valve, the other end of the high-pressure release valve is connected with a connecting pipe n, the connecting pipe n is connected with one end of a connecting pipe o, the other end of the connecting pipe o is connected with the second end of a pressure release pump, the other end of the connecting pipe n is a water outlet, the third end of the pressure release pump;
check and scurry the gas injection mouth through connecting pipe s and pressure release valve one end, pressure measurement import valve one end links to each other, pressure measurement import valve other end connection connecting pipe t one end, the connecting pipe t other end links to each other with checking the pressure regulator that scurries, it installs on connecting pipe t to check the pressure gauge, it links to each other with connecting pipe u one end to check the pressure regulator other end, the connecting pipe u other end links to each other with gaseous pneumatic booster pump one end, gaseous pneumatic booster pump second end passes through connecting pipe v and links to each other with the nitrogen gas source, gaseous pneumatic booster pump third end links to each other with connecting pipe w one end, the connecting pipe w other end links to each other with II one ends of booster valve, II other ends of booster valve.
2. The device for measuring the alternating internal pressure of the casing to destroy the integrity of the cement sheath according to claim 1, wherein the middle part of the kettle cover is provided with a round hole, the round hole in the middle part is matched with the wall body of the through hole in the middle part of the casing upper cover, and the covered bottom surface is matched with the top surface of the lower part of the casing upper cover, the top surface of the rubber tube, the top surface of the metal sleeve and the top surface of the annular space of the kettle body.
3. The apparatus for measuring the integrity of cement sheath destroyed by the alternating internal pressure of the casing according to claim 1, wherein the lower wall of the casing lower cover is engaged with the bottom wall of the kettle, the bottom surface of the middle wall of the casing lower cover is engaged with the inner wall of the bottom of the kettle, the side surface of the middle wall of the casing lower cover is engaged with the side surface of the rubber tube, and the top surface of the middle wall of the casing lower cover is engaged with the bottom surface of the casing and the bottom surface of the cement sheath.
4. The apparatus for measuring the integrity of a cement sheath destroyed by the alternating internal pressure of the casing according to claim 1, wherein the apparatus is designed according to the concentricity of the center of the casing lower cover and the center of the through hole in the middle of the casing lower cover of 30%, 67% and 100% respectively.
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| CN202021411246.5U CN212748586U (en) | 2020-07-17 | 2020-07-17 | Device for measuring integrity of casing damaged by alternating internal pressure of casing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111766166A (en) * | 2020-07-17 | 2020-10-13 | 西南石油大学 | Device and method for measuring integrity of casing damaged by alternating internal pressure of casing |
| CN113063664A (en) * | 2021-03-25 | 2021-07-02 | 西南石油大学 | Device and method for testing tensile bond strength of first interface of well cementation cement sheath of oil-gas well |
-
2020
- 2020-07-17 CN CN202021411246.5U patent/CN212748586U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111766166A (en) * | 2020-07-17 | 2020-10-13 | 西南石油大学 | Device and method for measuring integrity of casing damaged by alternating internal pressure of casing |
| CN111766166B (en) * | 2020-07-17 | 2024-03-22 | 西南石油大学 | Device and method for measuring integrity of cement sheath damaged by alternating internal pressure of sleeve |
| CN113063664A (en) * | 2021-03-25 | 2021-07-02 | 西南石油大学 | Device and method for testing tensile bond strength of first interface of well cementation cement sheath of oil-gas well |
| CN113063664B (en) * | 2021-03-25 | 2021-12-28 | 西南石油大学 | Device and method for testing tensile bond strength of first interface of well cementation cement sheath of oil-gas well |
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