CN103324214B - A kind of constant-pressure pressure control method for Oil well cement maintenance kettle - Google Patents
A kind of constant-pressure pressure control method for Oil well cement maintenance kettle Download PDFInfo
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Abstract
The invention discloses a kind of constant-pressure pressure control method for Oil well cement maintenance kettle, comprise the following steps successively: constant voltage heating step, constant voltage constant temperature step, constant voltage cooling step.The present invention instead of the pressure method of the equipment such as air compressor machine, hydraulic pump, solenoid valve, surge tank that tradition uses, and can accurately fluctuate by controlled pressure, autostable controlled pressure; The requirement of pressure surge in GB10238-2005 standard is ± 0.345MPa, and working control precision of the present invention can reach ± 0.25MPa, and the technology such as solenoid valve in the past that reaches is beyond one's reach technical merit.
Description
Technical field
The present invention relates to cement physical and mechanical property detection technique field, particularly relate to a kind of constant-pressure pressure control method for Oil well cement maintenance kettle.
Background technology
When Oil well cement maintenance kettle is for checking oil well cement intensity, provide a kind of instrument and equipment of High Temperature High Pressure care environments.Its technical requirement meets API Spec 10A.The GB10238-2005 of China is the standard content of adopting by equivalent API Spec 10A, and that oil field user adopts is API RP 10B, and the GB19139-2003 of China is the standard content of adopting by equivalent API RP 10B.Generally use the curing autoclave of CHANDLER company at present in the world, typical model is 7370 types.Some producers digestion foreign technology on the ground such as China Shenyang produces curing autoclave voluntarily, though there are some to improve, but does not all have the change of essence.
Existing curing autoclave can only the cube of conserve oil well cement, therefore, can only detect compressive strength.General cement has resistance to compression, anti-folding, tension, split draw, the concrete intensity index such as antifatigue.The anti-folding of general use, compressive strength are as the intensity index of cement.And in oil well cement ruggedness test, what continue to use is API Spec 10A standard, wherein there is no rupture strength index.Use till today always.In order to evaluate the strength character of oil well cement more all sidedly, needing to detect the rupture strength of oil well cement, therefore, needing a kind of High Temperature High Pressure maintenance instrument and equipment that bar shaped test block mould can be provided, thus can bending and compressive strength be detected.Instrument and equipment involved in the present invention is exactly that one both can maintenance cube mould, also can the High Temperature High Pressure maintenance instrument and equipment of maintenance bar shaped test block mould.
The reason of use curing autoclave is: well cementing operation under real well, and grout is all through via flow under condition with pressure, and the processes such as replacement and solidification form water mudrock structure.Actual temperature is more much higher than general general-purpose cement temperature, generally can reach 100 DEG C ~ 200 DEG C, reach as high as 350 DEG C.Therefore, under simulation well, actual conditions carry out maintenance test, can obtain the check data of relatively actual state.
Such as, application number is CN201020123902.1, and publication number is the Chinese patent " high-low temperature supercharging curing autoclave " of CN201622270U, discloses a kind of high-low temperature supercharging curing autoclave, belongs to Material Physics mechanics properties testing equipment technical field.It is made up of main body, control panel, temperature, pressure control instrument, autoclave, ebullator, cryogenic box, heat exchanger, refrigeration cycle pump, filtrator, recycling can, surge tank and compressor etc.Control panel is arranged on the top of main body, and main body is built with autoclave, ebullator, cryogenic box, heat exchanger, refrigeration cycle pump, recycling can, surge tank, compressor, flow-controlling meter.The weak point of this patent is: 1, can only carry out maintenance to the cube that oil well cement carries out compressive property detection, maintenance is carried out in the bar shaped test block that the fracture resistance that cannot carry out oil well cement detects; 2, in maintenance processes, can not accomplish that constant voltage heats up and constant voltage cooling, not be inconsistent with the requirement of GB10238-2005 or GB19139-2003.
Summary of the invention
The object of the invention is to the problems referred to above overcoming prior art existence, propose a kind of constant-pressure pressure control method for Oil well cement maintenance kettle.The present invention instead of the pressure method of the equipment such as air compressor machine, hydraulic pump, solenoid valve, surge tank that tradition uses, and can accurately fluctuate by controlled pressure, autostable controlled pressure; The requirement of pressure surge in GB10238-2005 standard is ± 0.345MPa, and working control precision of the present invention can reach ± 0.1MPa, and the technology such as solenoid valve in the past that reaches is beyond one's reach technical merit.
The present invention realizes by the following technical solutions:
For a constant-pressure pressure control method for Oil well cement maintenance kettle, it is characterized in that comprising the following steps successively:
Constant voltage heating step: the mould of cement sample and the pressure rising after heating of the kettle of water are housed, adopt back pressure controller to be rushed down by unnecessary pressure, make kettle keep constant pressure in temperature-rise period always;
Constant voltage constant temperature step: after constant voltage heating step, keeps temperature constant, keeps kettle pressure constant in fluctuation range;
Constant voltage cooling step: the mould of cement sample and the kettle of water are housed and carry out pressure after heat exchange cooling through cold water and reduce, when kettle pressure is lower than back pressure pressure, back pressure controller keeps blocking state; When the setting value of kettle pressure lower than hydraulic pump control device, hydraulic pump is of short duration startup under the control of hydraulic pump control device, increases kettle pressure, keeps kettle pressure in fluctuation range, keep constant.
In described constant voltage heating step, when kettle pressure is higher than back pressure pressure, back pressure controller stays open state, and the liquid now in connecting tube I slowly gushes through back pressure controller, kettle pressure drop; Kettle can keep constant pressure in temperature-rise period always, until temperature-rise period terminates.
In described constant voltage heating step, kettle pressure and back pressure pressure remain on a stable difference, thus make kettle can keep constant pressure in temperature-rise period, until temperature-rise period terminates always.
In described constant voltage cooling step, each of short duration startup of hydraulic pump increases stressed added value to kettle and sets by hydraulic pump control device.By the adjustment to added value, control the fluctuation range of kettle pressure.
In described constant voltage cooling step, hydraulic pump control device compares according to the setting value of the detected value of kettle pressure transducer and hydraulic pump control device, if detected value is lower than setting value, hydraulic pump control device, by of short duration startup hydraulic pump works, increases certain liquid to increase the pressure of kettle to kettle; After pressure gos up, hydraulic pump quits work; When detected value is again lower than setting value, repeat above-mentioned pressurization, keep kettle pressure in fluctuation range, to keep constant, until temperature-fall period terminates.
After constant voltage cooling step terminates, before opening kettle cover, stop hydraulic control pump work by hydraulic pump control device; Open back pressure boosting valve, then open hydraulic pump pressure relief valve, open kettle cover, take out mould after making kettle pressure slowly be reduced to normal pressure, broken type inspection rupture strength and compressive strength are waited in the demoulding.
A kind of constant-pressure pressure control system for Oil well cement maintenance kettle, it is characterized in that: comprise back pressure controller, back pressure accumulator and connecting tube I, described back pressure controller is communicated with kettle by connecting tube I, described connecting tube I is communicated with connecting tube II, one end of described connecting tube II is communicated with connecting tube I, and the other end is communicated with back pressure accumulator; Described connecting tube I is provided with pressure control valve, and connecting tube II is provided with back pressure boosting valve, and described connecting tube II is also communicated with connecting tube III, and connecting tube III is provided with back pressure step-down valve.
Described connecting tube II is also communicated with connecting tube IV, and back pressure controller is communicated with connecting tube II by connecting tube IV, and back pressure boosting valve is arranged on the connecting tube II between connecting tube I and connecting tube IV.
Also comprise hydraulic pump and connecting tube V, one end of described connecting tube V is communicated with connecting tube I, and the other end is communicated with hydraulic pump.
Connecting tube I between described connecting tube V and connecting tube II is provided with kettle pressure transducer, and the connecting tube II between back pressure accumulator and connecting tube III is provided with back pressure pressure transducer.
Described connecting tube II is also communicated with connecting tube VI, and connecting tube VI is provided with safety-valve.
Also comprise high pressure valve, described high pressure valve is separately positioned on the upper and lower of kettle.
The precision of described back pressure controller controlled pressure is ± 0.25MPa.
Described back pressure controller comprises sealed cylinder block, described sealed cylinder block internal fixtion has flexible gland, entity spool, be provided with the back pressure joint I of liquid input channel and be provided with the back pressure joint II of fluid outlet channels, described back pressure joint I and back pressure joint II all have counterbore, the counterbore of described entity spool by back pressure joint I and the counterbore clamping of back pressure joint II, described entity spool is provided with the spool bulge loop between back pressure joint I and back pressure joint II; Described flexible gland is sleeved on back pressure joint I, spool bulge loop and back pressure joint II, described being sleeved between flexible gland on spool bulge loop and sealed cylinder block is provided with gap, described back pressure joint I, entity spool, spool bulge loop, forms fluid passage between back pressure joint II and flexible gland.
Described back pressure joint I and back pressure joint II are equipped with sealing bulge loop, back pressure joint I and back pressure joint II are divided into seal section I and seal section II by described sealing bulge loop respectively, described counterbore is opened on the seal section I of back pressure joint I and the seal section I of back pressure joint II respectively, gap between described two sealing bulge loops forms annular pressure control chamber, and described sealed cylinder block is provided with the pressure control hole for pressure control.
The seal section I of described back pressure joint I and the seal section I of back pressure joint II are equipped with choked flow bulge loop, and the height of described choked flow bulge loop is lower than the height sealing bulge loop.
The surface of the surface of described spool bulge loop, the surface of the seal section I of back pressure joint I and the seal section I of back pressure joint II is on same surface level.
The end face of the bare terminal end of described back pressure joint I and back pressure joint II is distributed with groove, fit in the surface of described groove and entity spool and spool bulge loop, groove, entity spool, slit-shaped fluidly passage between spool bulge loop and flexible gland, the degree of depth of described groove is 0.1mm-0.3mm, can prevent particle from blocking.
Described back pressure controller also comprises the pressure control joint be arranged on sealed cylinder block, and described pressure control joint is provided with pressure control passage, the one end in described pressure control hole and pressure control channel connection, and the other end is communicated with annular pressure control chamber.
The setting position in described pressure control hole is corresponding with the position of spool bulge loop.
Described back pressure controller also comprises sealing cap I and sealing cap II, described back pressure joint I and back pressure joint II are equipped with extension, described sealing cap I is sleeved on the extension of back pressure joint I, described sealing cap II is sleeved on the extension of back pressure joint II, and described back pressure joint I and back pressure joint II are fixed on sealed cylinder block respectively by sealing cap I and sealing cap II.
Gap between sealing bulge loop on described sealing cap I and back pressure joint I forms annular seal space, and the gap between the sealing bulge loop on sealing cap II and back pressure joint II also forms annular seal space; " O " shape O-ring seal, Sealing shield ring and metal washer is provided with from inside to outside successively in described annular seal space.
Described " O " shape O-ring seal and Sealing shield ring are multiple, and multiple " O " shape O-ring seal and Sealing shield ring are interspersed in annular seal space.
Described flexible gland is rubber sleeve.
Compared with prior art, its advantage is in the present invention:
1, the present invention instead of the pressure method of the equipment such as air compressor machine, hydraulic pump, solenoid valve, surge tank that tradition uses, and can accurately fluctuate by controlled pressure, autostable controlled pressure; The requirement of pressure surge in GB10238-2005 standard is ± 0.345MPa, and working control precision of the present invention can reach ± 0.25MPa, and the technology such as solenoid valve in the past that reaches is beyond one's reach technical merit.
2, adopt method of the present invention, in kettle temperature-rise period, unnecessary pressure can be rushed down, make kettle keep constant pressure in temperature-rise period always; In kettle temperature-fall period, also can add kettle pressure, keep kettle pressure in fluctuation range, keep constant; The present invention can allow the cement sample in kettle along with kettle experience that constant voltage heats up successively, after the process of the gentle constant voltage cooling of constant pressure and constant, the cement sample of taking-up can be used for the inspection of rupture strength and compressive strength.
3, the constant-pressure pressure control system that the present invention uses adopts pressure control valve, back pressure boosting valve and back pressure step-down valve; Pressure control valve controls the valve between kettle internal pressure pipeline and constant-pressure pressure reduced pressure controller, and during closedown, the rising of kettle pressure can not by the pressure release of pressure pressure release channel, normally normally open.Pipeline between back pressure back-up valve gate control kettle pressure and constant-pressure pressure stabilizator, for raising or reduce the pressure of constant-pressure pressure stabilizator.When opening, kettle internal pressure is consistent with the pressure of constant-pressure pressure stabilizator, and during closedown, constant-pressure pressure stabilizator is stabilized in the required value controlled.Back pressure step-down valve is back pressure accumulator and the valve directly between pressure relief pipe.Open this valve, directly can reduce the pressure of back pressure accumulator, thus reduce kettle internal pressure by back pressure controller.But when reducing kettle pressure in experiment, the pressure relief valve on general employing valve body more thick firmly pressurized water press pump carrys out step-down.During normal assays, back pressure step-down valve is closed.
4, the constant-pressure pressure control system one-piece construction of the present invention's use is simple, easy to operate, and low cost of manufacture.
5, the present invention uses back pressure controller, and resistance is little, precision is high, and back pressure controller internal flow dead volume is little, is quick on the draw during Stress control, and pressure controling precision can reach ± 0.25MPa.
6, the present invention adopts thinner rubber sleeve as the flexible sealing of back pressure controller and pressure sensitive film, and good springiness, resistance are little, precision is high, and back pressure controller internal flow dead volume is little, and stress reaction is sensitive.
7, the back pressure joint I of back pressure controller of the present invention's use and the end face of the bare terminal end of back pressure joint II are distributed with groove, described groove and entity valve wicking surface are fitted and are formed fluid passage, the degree of depth of described groove is 0.1mm-0.3mm, can prevent particle from blocking.
8, the back pressure controller that the present invention uses can form symmetrical structure, can distinguish pressure control back pressure end in use and go out pressure side, when a termination pressure control back pressure, the other end is out pressure side, therefore in use, need not distinguish the problem of which termination back pressure again, easy for installation, easy to use.
9, the back pressure controller that the present invention uses can adopt filter screen, can avoid fluid impurity blocking channel, impurity also can be avoided to be strutted by sealing shroud, cause the situation that sealing shroud is not closed completely, the closedown intensity of sealing shroud when both ensure that liquid communication in turn ensure that circulation.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention
Fig. 2 is pressure process schematic diagram of the present invention
Fig. 3 is constant voltage intensification control system figure of the present invention
Fig. 4 is back pressure controller structural representation of the present invention
Fig. 5 is the entity spool place enlarged drawing of back pressure controller of the present invention
Fig. 6 is the back pressure joint design schematic diagram of back pressure controller of the present invention
Be labeled as in figure: 1, kettle pressure transducer, 2, back pressure pressure transducer, 3, kettle bottom high pressure valve, 4, pressure control valve, 5, back pressure boosting valve, 6, back pressure step-down valve, 7, back pressure accumulator, 8, low pressure delivery valve, 9, low pressure inlet valve, 10, chilled water inlet valve, 11, hydraulic pump pressure relief valve, 12, kettle top high pressure valve, 13, hydraulic pump, 14, kettle, 15 back pressure controller, 16, safety-valve, 17, hydraulic pump control device, 18, casing, 19, control panel, 20, temperature controller, 21, temperature indicator, 22, back pressure pressure display unit, 111, connecting tube I, 112, connecting tube II, 113, connecting tube III, 114, connecting tube IV, 115, connecting tube V, 116, connecting tube VI, 201, sealed cylinder block, 202, back pressure joint I, 203, back pressure joint II, 204, entity spool, 205, flexible gland, 206, spool bulge loop, 207, sealing bulge loop, 208, seal section I, 209, seal section II, 210, extension, 211, " O " shape O-ring seal, 212, Sealing shield ring, 213, metal washer, 214, sealing cap I, 215, sealing cap II, 216, choked flow bulge loop, 217, pressure control joint.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further detailed:
For a constant-pressure pressure control method for Oil well cement maintenance kettle, comprise the following steps:
Constant voltage heating step: the mould of cement sample and the pressure rising after heating of the kettle of water are housed, adopt back pressure controller to be rushed down by unnecessary pressure, make kettle keep constant pressure in temperature-rise period always;
Constant voltage constant temperature step: after constant voltage heating step, keeps temperature constant, keeps kettle pressure constant in fluctuation range;
Constant voltage cooling step: the mould of cement sample and the kettle of water are housed and carry out pressure after heat exchange cooling through cold water and reduce, when kettle pressure is lower than back pressure pressure, back pressure controller keeps blocking state; When the setting value of kettle pressure lower than hydraulic pump control device, hydraulic pump is of short duration startup under the control of hydraulic pump control device, increases kettle pressure, keeps kettle pressure in fluctuation range, keep constant.
In constant voltage heating step of the present invention, when kettle pressure is higher than back pressure pressure, back pressure controller stays open state, and the liquid now in connecting tube I slowly gushes through back pressure controller, kettle pressure drop; Kettle can keep constant pressure in temperature-rise period always, until temperature-rise period terminates.
In constant voltage heating step of the present invention, kettle pressure and back pressure pressure remain on a stable difference, thus make kettle can keep constant pressure in temperature-rise period, until temperature-rise period terminates always.
In constant voltage cooling step of the present invention, each of short duration startup of hydraulic pump increases stressed added value to kettle and sets by hydraulic pump control device; By the adjustment to added value, control the fluctuation range of kettle pressure.
In constant voltage cooling step of the present invention, hydraulic pump control device compares according to the setting value of the detected value of kettle pressure transducer and hydraulic pump control device, if detected value is lower than setting value, hydraulic pump control device, by of short duration startup hydraulic pump works, increases certain liquid to increase the pressure of kettle to kettle; After pressure gos up, hydraulic pump quits work; When detected value is again lower than setting value, repeat above-mentioned pressurization, keep kettle pressure in fluctuation range, to keep constant, until temperature-fall period terminates.
After constant voltage cooling step of the present invention terminates, before opening kettle cover, stop hydraulic control pump work by hydraulic pump control device; Open back pressure boosting valve, then open hydraulic pump pressure relief valve, open kettle cover, take out mould after making kettle pressure slowly be reduced to normal pressure, broken type inspection rupture strength and compressive strength are waited in the demoulding.
The present invention in use, cement sample through slurrying, die-filling put into kettle and add a cover fastening after, water inlet exhaust, close and import and export high pressure valve 3 and 12, close back pressure step-down valve 6, open back pressure boosting valve 5, control by electric hydaulic pump controller the setting value that electric hydraulic pump 13 is pressurized to 20.7MPa.Now, kettle pressure and back pressure pressure are consistent, and back pressure controller 15 keeps blocking state.After pressure stabilisation, close back pressure boosting valve, back pressure remains unchanged substantially.
Setting hydraulic pump control device 17 starts pressurization, hydraulic pump control device 17 compares according to the force value of the signal value waited until from kettle pressure transducer 1 and setting, if the signal value of kettle pressure transducer 1 is lower than setting value, starting electric hydraulic pump 13 works to kettle pressurization, until when the signal value of kettle pressure transducer 1 is equal to or higher than the setting value of 20.7MPa.Electric hydraulic pump 13 quits work.
Then constant voltage intensification, the gentle constant voltage cooling of constant pressure and constant is carried out successively.
A kind of constant-pressure pressure control system for Oil well cement maintenance kettle that method of the present invention uses, comprise back pressure controller 15, back pressure accumulator 7 and connecting tube I 111, described back pressure controller 15 is communicated with kettle 14 by connecting tube I 111, described connecting tube I 111 is communicated with connecting tube II 112, one end of described connecting tube II 112 is communicated with connecting tube I 111, and the other end is communicated with back pressure accumulator 7; Described connecting tube I 111 is provided with pressure control valve 4, and connecting tube II 112 is provided with back pressure boosting valve 5, and described connecting tube II 112 is also communicated with connecting tube III 113, and connecting tube III 113 is provided with back pressure step-down valve 6.
In the present invention, described connecting tube II 112 is also communicated with connecting tube IV 114, back pressure controller 15 is communicated with connecting tube II 112 by connecting tube IV 114, and back pressure boosting valve 5 is arranged on the connecting tube II 112 between connecting tube I 111 and connecting tube IV 114.
In the present invention, also comprise hydraulic pump 13 and connecting tube V 115, one end of described connecting tube V 115 is communicated with connecting tube I 111, and the other end is communicated with hydraulic pump 13.
In the present invention, the connecting tube I 111 between described connecting tube V 115 and connecting tube II 112 is provided with kettle pressure transducer 1, and the connecting tube II 112 between back pressure accumulator 7 and connecting tube III 113 is provided with back pressure pressure transducer 2.
In the present invention, described connecting tube II 112 is also communicated with connecting tube VI 114, and connecting tube VI 114 is provided with safety-valve 4.
In the present invention, also comprise high pressure valve, described high pressure valve is separately positioned on the upper and lower of kettle.
In the present invention, described back pressure controller 15 comprises sealed cylinder block 201, described sealed cylinder block 201 internal fixtion has flexible gland 205, entity spool 204, be provided with the back pressure joint I 202 of liquid input channel and be provided with the back pressure joint II 203 of fluid outlet channels, described back pressure joint I 202 and back pressure joint II 203 all have counterbore, the counterbore of described entity spool 204 by back pressure joint I 202 and the counterbore clamping of back pressure joint II 203, described entity spool 204 is provided with the spool bulge loop 206 between back pressure joint I 202 and back pressure joint II 203; Described flexible gland 205 is sleeved on back pressure joint I 202, spool bulge loop 206 and back pressure joint II 203, described being sleeved between flexible gland 205 on spool bulge loop 206 and sealed cylinder block 201 is provided with gap, described back pressure joint I 202, entity spool 204, spool bulge loop 206, forms fluid passage between back pressure joint II 203 and flexible gland 205.
Described back pressure joint I 202 and back pressure joint II 203, on be equipped with sealing bulge loop 207, described sealing bulge loop 207, respectively back pressure joint I 202 and back pressure joint II 203 are divided into seal section I 208 and seal section II 209, described counterbore is opened on the seal section I 208 of back pressure joint I 202 and the seal section I 208 of back pressure joint II 203 respectively, gap between described two sealing bulge loops 207 forms annular pressure control chamber, and described sealed cylinder block 201 is provided with the pressure control hole for pressure control.
The seal section I 208 of described back pressure joint I 202 and the seal section I 208 of back pressure joint II 203 are equipped with choked flow bulge loop 216, and the height of described choked flow bulge loop 216 is lower than the height sealing bulge loop 207.
The surface of the surface of described spool bulge loop 206, the surface of the seal section I 208 of back pressure joint I 202 and the seal section I 208 of back pressure joint II 203 is on same surface level.
The end face of the bare terminal end of described back pressure joint I202 and back pressure joint II203 is distributed with groove, fit in the surface of described groove and entity spool 204 and spool bulge loop 206, groove, entity spool 204, slit-shaped fluidly passage between spool bulge loop 206 and flexible gland 205, the degree of depth of described groove is 0.1mm-0.3mm, can prevent particle from blocking.
Described back pressure controller 15 also comprises the pressure control joint 217 be arranged on sealed cylinder block 201, and described pressure control joint 217 is provided with pressure control passage, the one end in described pressure control hole and pressure control channel connection, and the other end is communicated with annular pressure control chamber.
The setting position in described pressure control hole is corresponding with the position of spool bulge loop 206.
Described back pressure controller 15 also comprises sealing cap I 2014 and sealing cap II 215, described back pressure joint I 202 and back pressure joint II 203 are equipped with extension 210, described sealing cap I 214 is sleeved on the extension 210 of back pressure joint I 202, described sealing cap II 215 is sleeved on the extension 210 of back pressure joint II 203, and described back pressure joint I 202 and back pressure joint II 203 are fixed on sealed cylinder block 201 respectively by sealing cap I 214 and sealing cap II 215.
Gap between sealing bulge loop 207 on described sealing cap I 214 and back pressure joint I 202 forms annular seal space, and the gap between the sealing bulge loop 207 on sealing cap II 215 and back pressure joint II 203 also forms annular seal space; " O " shape O-ring seal 211, Sealing shield ring 212 and metal washer 213 is provided with from inside to outside successively in described annular seal space.
Described " O " shape O-ring seal 211 and Sealing shield ring 212 are multiple, and multiple " O " shape O-ring seal 211 and Sealing shield ring 212 are interspersed in annular seal space.
Described flexible gland 205 is rubber sleeve.
The present invention in use, a 200ml can be accessed on pressure control joint 217, accumulator that working pressure is 60MPa can voltage stabilizing, utilize the characteristic of accumulator to prevent peripheral pressure to fluctuate to impact back pressure controller pressure control end pressure, make back pressure controller pressure control end make to keep stable working pressure eventually, thus mention the operating accuracy of back pressure controller.
The present invention also can be applicable in a kind of Oil well cement maintenance kettle that applicant applies for simultaneously, a kind of Oil well cement maintenance kettle, comprise casing, kettle and control panel, described control panel is arranged on casing, described casing is provided with kettle installation cavity, also comprise constant-pressure pressure control system, constant-pressure pressure control system comprises back pressure controller, back pressure accumulator and connecting tube I, described back pressure controller is communicated with kettle by connecting tube I, described connecting tube I is communicated with connecting tube II, one end of described connecting tube II is communicated with connecting tube I, the other end is communicated with back pressure accumulator, described connecting tube I is provided with pressure control valve, connecting tube II is provided with back pressure boosting valve, described connecting tube II is also communicated with connecting tube III, connecting tube III is provided with back pressure step-down valve, and described pressure control valve, back pressure boosting valve and back pressure step-down valve are installed on control panel.
Claims (10)
1., for a constant-pressure pressure control method for Oil well cement maintenance kettle, it is characterized in that comprising the following steps successively:
Constant voltage heating step: the mould of cement sample and the pressure rising after heating of the kettle of water are housed, adopt back pressure controller to be rushed down by unnecessary pressure, make kettle keep constant pressure in temperature-rise period always;
Constant voltage constant temperature step: after constant voltage heating step, keeps temperature constant, keeps kettle pressure constant in fluctuation range;
Constant voltage cooling step: the mould of cement sample and the kettle of water are housed and carry out pressure after heat exchange cooling through cold water and reduce, when kettle pressure is lower than back pressure pressure, back pressure controller keeps blocking state; When the setting value of kettle pressure lower than hydraulic pump control device, hydraulic pump is of short duration startup under the control of hydraulic pump control device, increases kettle pressure, keeps kettle pressure in fluctuation range, keep constant.
2. a kind of constant-pressure pressure control method for Oil well cement maintenance kettle according to claim 1, it is characterized in that: in described constant voltage heating step, when kettle pressure is higher than back pressure pressure, back pressure controller stays open state, liquid now in connecting tube I slowly gushes through back pressure controller, kettle pressure drop; Kettle can keep constant pressure in temperature-rise period always, until temperature-rise period terminates.
3. a kind of constant-pressure pressure control method for Oil well cement maintenance kettle according to claim 2, it is characterized in that: in described constant voltage heating step, kettle pressure and back pressure pressure remain on a stable difference, thus make kettle can keep constant pressure in temperature-rise period, until temperature-rise period terminates always.
4. a kind of constant-pressure pressure control method for Oil well cement maintenance kettle according to claim 1, it is characterized in that: in described constant voltage cooling step, each of short duration startup of hydraulic pump increases stressed added value to kettle and sets by hydraulic pump control device.
5. a kind of constant-pressure pressure control method for Oil well cement maintenance kettle according to claim 4, it is characterized in that: in described constant voltage cooling step, hydraulic pump control device compares according to the setting value of the detected value of kettle pressure transducer and hydraulic pump control device, if detected value is lower than setting value, hydraulic pump control device, by of short duration startup hydraulic pump works, increases certain liquid to increase the pressure of kettle to kettle; After pressure gos up, hydraulic pump quits work; When detected value is again lower than setting value, repeat above-mentioned pressurization, keep kettle pressure in fluctuation range, to keep constant, until temperature-fall period terminates.
6. a kind of constant-pressure pressure control method for Oil well cement maintenance kettle according to claim 5, is characterized in that: after constant voltage cooling step terminates, before opening kettle cover, stops hydraulic control pump work by hydraulic pump control device; Open back pressure boosting valve, then open hydraulic pump pressure relief valve, open kettle cover, take out mould after making kettle pressure slowly be reduced to normal pressure, broken type inspection rupture strength and compressive strength are waited in the demoulding.
7. a kind of constant-pressure pressure control method for Oil well cement maintenance kettle according to claim 1, it is characterized in that: the method adopts the constant-pressure pressure control system being used for Oil well cement maintenance kettle, described constant-pressure pressure control system comprises back pressure controller (15), back pressure accumulator (7) and connecting tube I (111), described back pressure controller (15) is communicated with kettle (14) by connecting tube I (111), described connecting tube I (111) is communicated with connecting tube II (112), one end of described connecting tube II (112) is communicated with connecting tube I (111), the other end is communicated with back pressure accumulator (7), described connecting tube I (111) is provided with pressure control valve (4), connecting tube II (112) is provided with back pressure boosting valve (5), described connecting tube II (112) is also communicated with connecting tube III (113), and connecting tube III (113) is provided with back pressure step-down valve (6).
8. a kind of constant-pressure pressure control method for Oil well cement maintenance kettle according to claim 7, it is characterized in that: described connecting tube II (112) is also communicated with connecting tube IV (114), back pressure controller (15) is communicated with connecting tube II (112) by connecting tube IV (114), and back pressure boosting valve (5) is arranged on the connecting tube II (112) between connecting tube I (111) and connecting tube IV (114); Also comprise hydraulic pump (13) and connecting tube V (115), one end of described connecting tube V (115) is communicated with connecting tube I (111), and the other end is communicated with hydraulic pump (13); Connecting tube I (111) between described connecting tube V (115) and connecting tube II (112) is provided with kettle pressure transducer (1), and the connecting tube II (112) between back pressure accumulator (7) and connecting tube III (113) is provided with back pressure pressure transducer (2).
9. a kind of constant-pressure pressure control method for Oil well cement maintenance kettle according to claim 6, it is characterized in that: described back pressure controller (15) comprises sealed cylinder block (201), described sealed cylinder block (201) internal fixtion has flexible gland (205), entity spool (204), be provided with the back pressure joint I (202) of liquid input channel and be provided with the back pressure joint II (203) of fluid outlet channels, described back pressure joint I (202) and back pressure joint II (203) all have counterbore, the counterbore of described entity spool (204) by back pressure joint I (202) and the counterbore clamping of back pressure joint II (203), described entity spool (204) is provided with the spool bulge loop (206) be positioned between back pressure joint I (202) and back pressure joint II (203), described flexible gland (205) is sleeved on back pressure joint I (202), spool bulge loop (206) and back pressure joint II (203), described being sleeved between flexible gland (205) on spool bulge loop (206) and sealed cylinder block (201) is provided with gap, described back pressure joint I (202), entity spool (204), spool bulge loop (206), forms fluid passage between back pressure joint II (203) and flexible gland (205).
10. a kind of constant-pressure pressure control method for Oil well cement maintenance kettle according to claim 9, it is characterized in that: the end face of the bare terminal end of described back pressure joint I (202) and back pressure joint II (203) is distributed with groove, fit in the surface of described groove and entity spool (204) and spool bulge loop (206), groove, entity spool (204), slit-shaped fluidly passage between spool bulge loop (206) and flexible gland (205), the degree of depth of described groove is 0.1mm-0.3mm.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201622270U (en) * | 2010-02-11 | 2010-11-03 | 长江大学 | High-low temperature supercharging curing autoclave |
| CN102401770A (en) * | 2010-09-10 | 2012-04-04 | 中国石油化工股份有限公司 | Oil well cement high-temperature high-pressure tensile stress strain system and testing method thereof |
| WO2012049620A1 (en) * | 2010-10-12 | 2012-04-19 | Total S.A. | Measurement of properties of sample of curing compositions under high pressure |
| CN102445371A (en) * | 2011-11-10 | 2012-05-09 | 大连理工大学 | Integrated device for in-situ generation and decomposition of hydrate sediments and permeability measurement thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7441599B2 (en) * | 2005-11-18 | 2008-10-28 | Chevron U.S.A. Inc. | Controlling the pressure within an annular volume of a wellbore |
| US7942064B2 (en) * | 2008-08-14 | 2011-05-17 | Maki Jr Voldi E | Method and apparatus for measurement of mechanical characteristics of a cement sample |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201622270U (en) * | 2010-02-11 | 2010-11-03 | 长江大学 | High-low temperature supercharging curing autoclave |
| CN102401770A (en) * | 2010-09-10 | 2012-04-04 | 中国石油化工股份有限公司 | Oil well cement high-temperature high-pressure tensile stress strain system and testing method thereof |
| WO2012049620A1 (en) * | 2010-10-12 | 2012-04-19 | Total S.A. | Measurement of properties of sample of curing compositions under high pressure |
| CN102445371A (en) * | 2011-11-10 | 2012-05-09 | 大连理工大学 | Integrated device for in-situ generation and decomposition of hydrate sediments and permeability measurement thereof |
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Address after: 614003 Ma'anshan City, Sichuan Province, No. nine Feng Road, No. 2, Applicant after: Jia Hua special cement incorporated company Address before: 614003 Ma'anshan City, Sichuan Province, No. nine Feng Road, No. 2, Applicant before: Sichuan Jiahua Enterprise (Group) Co., Ltd. |
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