CN103324214A - Constant voltage pressure control method used for oil well cement curing kettle - Google Patents
Constant voltage pressure control method used for oil well cement curing kettle Download PDFInfo
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- CN103324214A CN103324214A CN2013103047240A CN201310304724A CN103324214A CN 103324214 A CN103324214 A CN 103324214A CN 2013103047240 A CN2013103047240 A CN 2013103047240A CN 201310304724 A CN201310304724 A CN 201310304724A CN 103324214 A CN103324214 A CN 103324214A
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Abstract
The invention discloses a constant voltage pressure control method used for an oil well cement curing kettle. The constant voltage pressure control method sequentially comprises the following steps of: constant voltage heating, constant voltage constant temperature and constant voltage cooling. A conventional pressurization method in which an air compressor, a hydraulic pump, an electromagnetic valve, a buffer tank and the like are used is replaced by the constant voltage pressure control method, pressure surges can be accurately controlled, and the pressure is controlled in an automatic and stable manner. The pressure surges in GB10238-2005 is +/-0.345MPa, and the actual control precision of the constant voltage pressure control method can reach +/-0.25MPa and reaches the technical level which technologies, such as the conventional electromagnetic valve technology in the prior art can not reach.
Description
Technical field
The present invention relates to cement physical and mechanical property detection technique field, particularly relate to a kind of constant voltage compress control method for oil well cement maintenance still.
Background technology
Oil well cement maintenance still is during for check oil well cement intensity, and a kind of instrument and equipment of High Temperature High Pressure maintenance environment is provided.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 the 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 at present the maintenance still of CHANDLER company in the world, typical model is 7370 types.Some producer's digestion foreign technologies on ground such as China Shenyang have been produced the maintenance still voluntarily, though there are some to improve, the variation of essence all do not had.
Existing maintenance still can only the maintenance oil well cement cube test block, therefore, can only detect compressive strength.General cement has resistance to compression, anti-folding, tension, split draw, concrete intensity index such as antifatigue.General anti-folding, the compressive strength used is as the cement intensity index.And aspect the oil well cement ruggedness test, what continue to use is API Spec 10A standard, does not wherein have the rupture strength index.Use till today always.In order to estimate the strength character of oil well cement more all sidedly, need the rupture strength of oil well cement be detected, therefore, need a kind of High Temperature High Pressure maintenance instrument and equipment that bar shaped test block mould can be provided, thereby can detect bending and compressive strength.Instrument and equipment involved in the present invention, be exactly a kind of both can maintenance cube test block mould, High Temperature High Pressure maintenance instrument and equipment that also can maintenance bar shaped test block mould.
Use the former of maintenance still because: well cementing operation under the real well, grout all be under band press strip spare through via flow, replace and process such as curing, form water mudrock structure.Actual temperature is more much higher than general general cement temperature, generally can reach 100 ℃ ~ 200 ℃, reaches as high as 350 ℃.Therefore, actual conditions are carried out maintenance test under the simulation well, can be relatively near the check data of actual state.
For example, application number is CN201020123902.1, and publication number is the Chinese patent " high low temperature supercharging maintenance still " of CN201622270U, discloses a kind of high low temperature supercharging maintenance still, belongs to Material Physics mechanical property checkout equipment technical field.It is made 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 installed in the top of main body, and autoclave, ebullator, cryogenic box, heat exchanger, refrigeration cycle pump, recycling can, surge tank, compressor, flow-controlling meter are housed in the main body.The weak point of this patent is: 1, can only carry out cube test block that compressive property detects to oil well cement and carry out maintenance, can't carry out the bar shaped test block that the fracture resistance of oil well cement detects and carry out maintenance; 2, in maintenance processes, can not accomplish that constant voltage heats up and constant voltage is lowered the temperature, be not inconsistent with the requirement of GB10238-2005 or GB19139-2003.
Summary of the invention
The objective of the invention is to overcome the problems referred to above that prior art exists, propose a kind of constant voltage compress control method for oil well cement maintenance still.The present invention has replaced the pressure method of equipment such as the air compressor machine, hydraulic pump, solenoid valve, surge tank of traditional use, accurately controlled pressure fluctuation, autostable controlled pressure; The requirement of pressure surge is ± 0.345MPa in the GB10238-2005 standard, and working control precision of the present invention can reach ± 0.25MPa, has reached in the past technology such as solenoid valve technical merit that is beyond one's reach.
The present invention realizes by the following technical solutions:
A kind of constant voltage compress control method for oil well cement maintenance still is characterized in that may further comprise the steps successively:
Constant voltage heating step: the mould of cement sample and kettle pressure after heating of water are housed raise, adopt the back pressure controller that unnecessary pressure is rushed down, make kettle in temperature-rise period, keep constant compression force always;
Constant voltage constant temperature step: behind the constant voltage heating step, keep temperature constant, keep kettle pressure constant in fluctuation range;
The constant voltage cooling step: the mould of cement sample and kettle pressure after cold water carries out the heat exchange cooling of water are housed reduce, when kettle pressure was lower than back pressure pressure, the back pressure controller kept blocking state; When kettle pressure was lower than the setting value of hydraulic pump controller, hydraulic pump is of short duration startup under the control of hydraulic pump controller, increased kettle pressure, kept kettle pressure to keep constant in fluctuation range.
In the described constant voltage heating step, when kettle pressure was higher than back pressure pressure, the back pressure controller stayed open state, and the liquid in the connecting tube I slowly gushes through the back pressure controller at this moment, and kettle pressure descends; Kettle can keep constant compression force always in temperature-rise period, finish up to temperature-rise period.
In the described constant voltage heating step, kettle pressure and back pressure pressure remain on a stable difference, thereby make kettle keep constant compression force in temperature-rise period always, finish up to temperature-rise period.
In the described constant voltage cooling step, the each of short duration startup of hydraulic pump can set for the added value of pressure that kettle increases by the hydraulic pump controller.Can control the fluctuation range of kettle pressure by the adjustment to added value.
In the described constant voltage cooling step, the hydraulic pump controller compares according to the detected value of kettle pressure transducer and the setting value of hydraulic pump controller, if detected value is lower than setting value, the hydraulic pump controller increases the pressure that certain liquid increases kettle with of short duration startup hydraulic pump works to kettle; After pressure went up, hydraulic pump quit work; When detected value is lower than setting value again, repeat above-mentioned pressurization, keep kettle pressure in fluctuation range, to keep constant, finish up to temperature-fall period.
The constant voltage cooling step before opening kettle cover, stops to control hydraulic pump works by the hydraulic pump controller after finishing; Open the back pressure valve that boosts, open the hydraulic pump pressure relief valve again, open kettle cover after making kettle pressure slowly be reduced to normal pressure, take out mould, broken type check rupture strength and compressive strength are waited in the demoulding.
A kind of constant voltage control pressurer system for oil well cement maintenance still, 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 the connecting tube I, be communicated with the connecting tube II on the described connecting tube I, one end of described connecting tube II is communicated with the connecting tube I, and the other end is communicated with the back pressure accumulator; Described connecting tube I is provided with the pressure control valve, and the connecting tube II is provided with the back pressure valve that boosts, and also is communicated with the connecting tube III on the described connecting tube II, and the connecting tube III is provided with back pressure step-down valve.
Also be communicated with the connecting tube IV on the described connecting tube II, the back pressure controller is communicated with the connecting tube II by the connecting tube IV, and the back pressure valve that boosts is arranged on the connecting tube II between connecting tube I and the connecting tube IV.
Also comprise hydraulic pump and connecting tube V, an end of described connecting tube V is communicated with the connecting tube I, and the other end is communicated with hydraulic pump.
Connecting tube I between described connecting tube V and the connecting tube II is provided with the kettle pressure transducer, and the connecting tube II between back pressure accumulator and the connecting tube III is provided with the back pressure pressure transducer.
Also be communicated with the connecting tube VI on the described connecting tube II, the 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, flexible gland, entity spool fixedly arranged in the described sealed cylinder block, be provided with the back pressure joint I of liquid input channel and be provided with the back pressure joint II of liquid output channel, all have counterbore on described back pressure joint I and the back pressure joint II, described entity spool is by the counterbore of back pressure joint I and the counterbore clamping of back pressure joint II, and 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 the back pressure joint II, described being sleeved between flexible gland on the spool bulge loop and the sealed cylinder block is provided with the gap, forms the fluid passage between described back pressure joint I, entity spool, spool bulge loop, back pressure joint II and the flexible gland.
Be equipped with the sealing bulge loop on described back pressure joint I and the back pressure joint II, described sealing bulge loop is divided into seal section I and seal section II with back pressure joint I and back pressure joint II respectively, described counterbore is opened in respectively on the seal section I of the seal section I of back pressure joint I and back pressure joint II, 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.
Be equipped with the choked flow bulge loop on the seal section I of the seal section I of described back pressure joint I and back pressure joint II, the height of described choked flow bulge loop is lower than the height of sealing bulge loop.
The surface of the seal section I of the surface of the seal section I of the surface of described spool bulge loop, back pressure joint I and back pressure joint II is on same surface level.
Be distributed with groove on the end face of the bare terminal end of described back pressure joint I and back pressure joint II, fit in the surface of described groove and entity spool and spool bulge loop, slit between groove, entity spool, spool bulge loop and the flexible gland forms the fluid passage, the degree of depth of described groove is 0.1mm-0.3mm, can prevent that particle from stopping up.
Described back pressure controller also comprises the pressure control joint that is installed on the sealed cylinder block, and described pressure control joint is provided with the pressure control passage, an end in described pressure control hole and pressure control channel connection, and the other end is communicated with annular pressure control chamber.
Described pressure control hole that the position is set 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 the sealed cylinder block by sealing cap I and sealing cap II respectively.
Gap between the sealing bulge loop on described sealing cap I and the back pressure joint I forms annular seal space, and the gap between the sealing bulge loop on sealing cap II and the back pressure joint II also forms annular seal space; Be provided with " O " shape O-ring seal, Sealing shield ring and metal washer in the described annular seal space from inside to outside successively.
Described " O " shape O-ring seal and Sealing shield ring are a plurality of, and a plurality of " O " shape O-ring seal and Sealing shield ring are interspersed in annular seal space.
Described flexible gland is rubber sleeve.
The present invention compared with prior art, its advantage is:
1, the present invention has replaced the pressure method of the equipment such as air compressor machine, hydraulic pump, solenoid valve, surge tank of traditional use, accurately controlled pressure fluctuation, autostable controlled pressure; The requirement of pressure surge is ± 0.345MPa in the GB10238-2005 standard, and working control precision of the present invention can reach ± 0.25MPa, has reached in the past technology such as solenoid valve technical merit that is beyond one's reach.
2, adopt method of the present invention, in the kettle temperature-rise period, unnecessary pressure can be rushed down, make kettle in temperature-rise period, keep constant compression force always; In the kettle temperature-fall period, also can add kettle pressure, keep kettle pressure in fluctuation range, to keep constant; After the present invention can allow the interior cement sample of kettle experience the process of constant voltage intensification, the gentle constant voltage cooling of constant pressure and constant successively along with kettle, the cement sample of taking-up can be used for the check of rupture strength and compressive strength.
3, the constant voltage control pressurer system that uses of the present invention adopts pressure control valve, back pressure boost valve and back pressure step-down valve; The pressure control valve is the valve between control kettle internal pressure pipeline and the constant voltage pressure reduced pressure controller, and the rising of kettle pressure can not be by the pressure release of pressure pressure release channel, normally normally open when closing.Pipeline between back pressure back-up valve gate control kettle pressure and the constant voltage manostat is for the pressure of rising or reduction constant voltage manostat.When opening, the kettle internal pressure is consistent with the pressure of constant voltage manostat, and the constant voltage manostat is stabilized on the value of required control when closing.Back pressure step-down valve is the valve between back pressure accumulator and the direct pressure relief pipe.Open this valve, can directly reduce the pressure of back pressure accumulator, thereby reduce the kettle internal pressure by the back pressure controller.But when reducing kettle pressure in the experiment, generally adopt the pressure relief valve on the thick more firm pressurized water press pump of valve body to come step-down.Back pressure step-down valve is closed during normal the test.
4, the constant voltage control pressurer 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 the 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 pressure control, and pressure controling precision can reach ± 0.1MPa.
6, the present invention adopts thinner rubber sleeve as flexible sealing and the pressure sensitive film of back pressure controller, and good springiness, resistance is little, precision is high, and back pressure controller internal flow dead volume is little, the stress reaction sensitivity.
7, be distributed with groove on the end face of the bare terminal end of the back pressure joint I of the back pressure controller of the present invention's use and back pressure joint II, described groove and entity spool face are fitted and are formed the fluid passage, the degree of depth of described groove is 0.1mm-0.3mm, can prevent that particle from stopping up.
8, the back pressure controller of the present invention's use 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 uses of the present invention can adopt filter screen, can avoid the fluid impurity blocking channel, also can avoid impurity that sealing shroud is strutted, the situation that causes sealing shroud to be not closed completely, and sealing shroud closes intensity when not only having guaranteed liquid communication but also guaranteed circulation.
Description of drawings
Fig. 1 is structural representation of the present invention
Fig. 2 is pressure process synoptic diagram of the present invention
Fig. 3 is constant voltage intensification control system figure of the present invention
Fig. 4 is back pressure controller architecture synoptic diagram 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 synoptic diagram of back pressure controller of the present invention
Be labeled as among the figure: 1, the kettle pressure transducer, 2, the back pressure pressure transducer, 3, kettle bottom high pressure valve, 4, the pressure control valve, 5, the back pressure valve that boosts, 6, back pressure step-down valve, 7, the back pressure accumulator, 8, the low pressure delivery valve, 9, the low pressure inlet valve, 10, the chilled water inlet valve, 11, the hydraulic pump pressure relief valve, 12, kettle top high pressure valve, 13, hydraulic pump, 14, kettle, 15 back pressure controllers, 16, safety-valve, 17, the hydraulic pump controller, 18, casing, 19, control panel, 20, temperature controller, 21, temperature indicator, 22, the back pressure pressure display unit; 111, the connecting tube I, 112, the connecting tube II, 113, the connecting tube III, 114, the connecting tube IV, 115, the connecting tube V, 116, the connecting tube VI, 201, sealed cylinder block, 202, back pressure joint I, 203, back pressure joint II, 204, the entity spool, 205, flexible gland, 206, the spool bulge loop, 207, the sealing bulge loop, 208, the seal section I, 209, the seal section II, 210, extension, 211, " O " shape O-ring seal, 212, Sealing shield ring, 213, metal washer, 214, the sealing cap I, 215, the sealing cap II, 216, the choked flow bulge loop, 217, the pressure control joint.
Embodiment
Below in conjunction with accompanying drawing the present invention is further detailed:
A kind of constant voltage compress control method for oil well cement maintenance still may further comprise the steps:
Constant voltage heating step: the mould of cement sample and kettle pressure after heating of water are housed raise, adopt the back pressure controller that unnecessary pressure is rushed down, make kettle in temperature-rise period, keep constant compression force always;
Constant voltage constant temperature step: behind the constant voltage heating step, keep temperature constant, keep kettle pressure constant in fluctuation range;
The constant voltage cooling step: the mould of cement sample and kettle pressure after cold water carries out the heat exchange cooling of water are housed reduce, when kettle pressure was lower than back pressure pressure, the back pressure controller kept blocking state; When kettle pressure was lower than the setting value of hydraulic pump controller, hydraulic pump is of short duration startup under the control of hydraulic pump controller, increased kettle pressure, kept kettle pressure to keep constant in fluctuation range.
In the constant voltage heating step of the present invention, when kettle pressure was higher than back pressure pressure, the back pressure controller stayed open state, and the liquid in the connecting tube I slowly gushes through the back pressure controller at this moment, and kettle pressure descends; Kettle can keep constant compression force always in temperature-rise period, finish up to temperature-rise period.
In the constant voltage heating step of the present invention, kettle pressure and back pressure pressure remain on a stable difference, thereby make kettle keep constant compression force in temperature-rise period always, finish up to temperature-rise period.
In the constant voltage cooling step of the present invention, the each of short duration startup of hydraulic pump can set for the added value of pressure that kettle increases by the hydraulic pump controller; Can control the fluctuation range of kettle pressure by the adjustment to added value.
In the constant voltage cooling step of the present invention, the hydraulic pump controller compares according to the detected value of kettle pressure transducer and the setting value of hydraulic pump controller, if detected value is lower than setting value, the hydraulic pump controller increases the pressure that certain liquid increases kettle with of short duration startup hydraulic pump works to kettle; After pressure went up, hydraulic pump quit work; When detected value is lower than setting value again, repeat above-mentioned pressurization, keep kettle pressure in fluctuation range, to keep constant, finish up to temperature-fall period.
After constant voltage cooling step of the present invention finishes, before opening kettle cover, stop to control hydraulic pump works by the hydraulic pump controller; Open the back pressure valve that boosts, open the hydraulic pump pressure relief valve again, open kettle cover after making kettle pressure slowly be reduced to normal pressure, take out mould, broken type check rupture strength and compressive strength are waited in the demoulding.
The present invention in use, cement sample through slurrying, the dress mould put into kettle and add a cover fastening after, the water inlet exhaust, close and import and export high pressure valve 3 and 12, close back pressure step-down valve 6, open the back pressure valve 5 that boosts, be pressurized to the setting value of 20.7MPa by electric hydaulic pump controller control electric hydraulic pump 13.At this moment, kettle pressure and back pressure pressure are consistent, and back pressure controller 15 keeps blocking state.After treating pressure stability, close the back pressure valve that boosts, back pressure remains unchanged substantially.
Set hydraulic pump controller 17 and begin pressurization, hydraulic pump controller 17 compares according to the signal value of waiting until from kettle pressure transducer 1 and the force value of setting, if the signal value of kettle pressure transducer 1 is lower than setting value, start electric hydraulic pump 13 work to the kettle pressurization, 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.
Carry out constant voltage intensification, the gentle constant voltage cooling of constant pressure and constant then successively.
A kind of constant voltage control pressurer system for oil well cement maintenance still that method of the present invention is used, 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, be communicated with connecting tube II 112 on the described connecting tube I 111, 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 the back pressure valve 5 that boosts, and also is communicated with connecting tube III 113 on the described connecting tube II 112, and connecting tube III 113 is provided with back pressure step-down valve 6.
Among the present invention, also be communicated with connecting tube IV 114 on the described connecting tube II 112, back pressure controller 15 is communicated with connecting tube II 112 by connecting tube IV 114, and the back pressure valve 5 that boosts is arranged on the connecting tube II 112 between connecting tube I 111 and the connecting tube IV 114.
Among the present invention, also comprise hydraulic pump 13 and connecting tube V 115, an end of described connecting tube V 115 is communicated with connecting tube I 111, and the other end is communicated with hydraulic pump 13.
Among the present invention, the connecting tube I 111 between described connecting tube V 115 and the connecting tube II 112 is provided with kettle pressure transducer 1, and the connecting tube II 112 between back pressure accumulator 7 and the connecting tube III 113 is provided with back pressure pressure transducer 2.
Among the present invention, also be communicated with connecting tube VI 114 on the described connecting tube II 112, connecting tube VI 114 is provided with safety-valve 4.
Among the present invention, also comprise high pressure valve, described high pressure valve is separately positioned on the upper and lower of kettle.
Among the present invention, described back pressure controller 15 comprises sealed cylinder block 201, in the described sealed cylinder block 201 flexible gland 205, entity spool 204 arranged fixedly, be provided with the back pressure joint I 202 of liquid input channel and be provided with the back pressure joint II 203 of liquid output channel, all have counterbore on described back pressure joint I 202 and the back pressure joint II 203, described entity spool 204 is by the counterbore of back pressure joint I 202 and the counterbore clamping of back pressure joint II 203, and 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 the back pressure joint II 203, described being sleeved between flexible gland 205 on the spool bulge loop 206 and the sealed cylinder block 201 is provided with the gap, forms the fluid passage between described back pressure joint I 202, entity spool 204, spool bulge loop 206, back pressure joint II 203 and the flexible gland 205.
Described back pressure joint I 202 and back pressure joint II 203, on be equipped with the 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 in respectively on the seal section I 208 of the seal section I 208 of back pressure joint I 202 and back pressure joint II 203, 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.
Be equipped with choked flow bulge loop 216 on the seal section I 208 of the seal section I 208 of described back pressure joint I 202 and back pressure joint II 203, the height of described choked flow bulge loop 216 is lower than the height of sealing bulge loop 207.
The surface of the seal section I 208 of the surface of the seal section I 208 of the surface of described spool bulge loop 206, back pressure joint I 202 and back pressure joint II 203 is on same surface level.
Be distributed with groove on the end face of the bare terminal end of described back pressure joint I202 and back pressure joint II203, fit in the surface of described groove and entity spool 204 and spool bulge loop 206, slit between groove, entity spool 204, spool bulge loop 206 and the flexible gland 205 forms the fluid passage, the degree of depth of described groove is 0.1mm-0.3mm, can prevent that particle from stopping up.
Described back pressure controller 15 also comprises the pressure control joint 217 that is installed on the sealed cylinder block 201, and described pressure control joint 217 is provided with the pressure control passage, an end in described pressure control hole and pressure control channel connection, and the other end is communicated with annular pressure control chamber.
Described pressure control hole that the position is set 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 the sealed cylinder block 201 by sealing cap I 214 and sealing cap II 215 respectively.
Gap between the sealing bulge loop 207 on described sealing cap I 214 and the back pressure joint I 202 forms annular seal space, and the gap between the sealing bulge loop 207 on sealing cap II 215 and the back pressure joint II 203 also forms annular seal space; Be provided with " O " shape O-ring seal 211, Sealing shield ring 212 and metal washer 213 in the described annular seal space from inside to outside successively.
Described " O " shape O-ring seal 211 and Sealing shield ring 212 are a plurality of, and a plurality of " 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, can can voltage stabilizing at pressure control joint 217 accumulator that to insert 200ml, a working pressure be 60MPa, utilize the characteristic of accumulator to prevent that peripheral pressure surge from impacting back pressure controller pressure control end pressure, back pressure controller pressure control end is made keep stable working pressure eventually, thereby mention the operating accuracy of back pressure controller.
The present invention also can be applicable on a kind of oil well cement maintenance still that the applicant applies for simultaneously, a kind of oil well cement maintenance still, comprise casing, kettle and control panel, described control panel is arranged on the casing, described casing is provided with the kettle installation cavity, also comprise the constant voltage control pressurer system, the constant voltage control pressurer system comprises the back pressure controller, back pressure accumulator and connecting tube I, described back pressure controller is communicated with kettle by the connecting tube I, be communicated with the connecting tube II on the described connecting tube I, one end of described connecting tube II is communicated with the connecting tube I, and the other end is communicated with the back pressure accumulator; Described connecting tube I is provided with the pressure control valve, the connecting tube II is provided with the back pressure valve that boosts, also be communicated with the connecting tube III on the described connecting tube II, the connecting tube III is provided with back pressure step-down valve, and boost valve and back pressure step-down valve of described pressure control valve, back pressure is installed on the control panel.
Claims (10)
1. constant voltage compress control method that is used for oil well cement maintenance still is characterized in that may further comprise the steps successively:
Constant voltage heating step: the mould of cement sample and kettle pressure after heating of water are housed raise, adopt the back pressure controller that unnecessary pressure is rushed down, make kettle in temperature-rise period, keep constant compression force always;
Constant voltage constant temperature step: behind the constant voltage heating step, keep temperature constant, keep kettle pressure constant in fluctuation range;
The constant voltage cooling step: the mould of cement sample and kettle pressure after cold water carries out the heat exchange cooling of water are housed reduce, when kettle pressure was lower than back pressure pressure, the back pressure controller kept blocking state; When kettle pressure was lower than the setting value of hydraulic pump controller, hydraulic pump is of short duration startup under the control of hydraulic pump controller, increased kettle pressure, kept kettle pressure to keep constant in fluctuation range.
2. a kind of constant voltage compress control method for oil well cement maintenance still according to claim 1, it is characterized in that: in the described constant voltage heating step, when kettle pressure is higher than back pressure pressure, the back pressure controller stays open state, liquid in the connecting tube I slowly gushes through the back pressure controller at this moment, and kettle pressure descends; Kettle can keep constant compression force always in temperature-rise period, finish up to temperature-rise period.
3. a kind of constant voltage compress control method for oil well cement maintenance still according to claim 2, it is characterized in that: in the described constant voltage heating step, kettle pressure and back pressure pressure remain on a stable difference, thereby make kettle in temperature-rise period, keep constant compression force always, finish up to temperature-rise period.
4. a kind of constant voltage compress control method for oil well cement maintenance still according to claim 1, it is characterized in that: in the described constant voltage cooling step, the each of short duration startup of hydraulic pump can set for the added value of pressure that kettle increases by the hydraulic pump controller.
5. a kind of constant voltage compress control method for oil well cement maintenance still according to claim 4, it is characterized in that: in the described constant voltage cooling step, the hydraulic pump controller compares according to the detected value of kettle pressure transducer and the setting value of hydraulic pump controller, if detected value is lower than setting value, the hydraulic pump controller increases the pressure that certain liquid increases kettle with of short duration startup hydraulic pump works to kettle; After pressure went up, hydraulic pump quit work; When detected value is lower than setting value again, repeat above-mentioned pressurization, keep kettle pressure in fluctuation range, to keep constant, finish up to temperature-fall period.
6. a kind of constant voltage compress control method for oil well cement maintenance still according to claim 5 is characterized in that: after the end of constant voltage cooling step, before opening kettle cover, stop to control hydraulic pump works by the hydraulic pump controller; Open the back pressure valve that boosts, open the hydraulic pump pressure relief valve again, open kettle cover after making kettle pressure slowly be reduced to normal pressure, take out mould, broken type check rupture strength and compressive strength are waited in the demoulding.
7. a kind of constant voltage compress control method for oil well cement maintenance still according to claim 1, it is characterized in that: this method adopts the constant voltage control pressurer system that is used for oil well cement maintenance still, described constant voltage control pressurer 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), be communicated with connecting tube II (112) on the described connecting tube I (111), 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 (11) is provided with pressure control valve (4), connecting tube II (112) is provided with the back pressure valve (5) that boosts, also be communicated with connecting tube III (113) on the described connecting tube II (112), connecting tube III (113) is provided with back pressure step-down valve (6).
8. a kind of constant voltage compress control method for oil well cement maintenance still according to claim 6, it is characterized in that: also be communicated with connecting tube IV (114) on the described connecting tube II (112), back pressure controller (15) is communicated with connecting tube II (112) by connecting tube IV (114), and the back pressure valve (5) that boosts is arranged on the connecting tube II (112) between connecting tube I (111) and the connecting tube IV (114); Also comprise hydraulic pump (13) and connecting tube V (115), an 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 the connecting tube II (112) is provided with kettle pressure transducer (1), and the connecting tube II (112) between back pressure accumulator (7) and the connecting tube III (113) is provided with back pressure pressure transducer (2).
9. a kind of constant voltage compress control method for oil well cement maintenance still according to claim 6, it is characterized in that: described back pressure controller (15) comprises sealed cylinder block (201), flexible gland (205) is fixedly arranged in the described sealed cylinder block (201), 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 liquid output channel, all have counterbore on described back pressure joint I (202) and the back pressure joint II (203), described entity spool (204) is by the counterbore of back pressure joint I (202) and the counterbore clamping of back pressure joint II (203), and described entity spool (204) is provided with the spool bulge loop (206) that is positioned between back pressure joint I (202) and the back pressure joint II (203); Described flexible gland (205) is sleeved on back pressure joint I (202), spool bulge loop (206) and the back pressure joint II (203), described being sleeved between flexible gland (205) on the spool bulge loop (206) and the sealed cylinder block (201) is provided with the gap, forms the fluid passage between described back pressure joint I (202), entity spool (204), spool bulge loop (206), back pressure joint II (203) and the flexible gland (205).
10. a kind of constant voltage compress control method for oil well cement maintenance still according to claim 8, it is characterized in that: be distributed with groove on the end face of the bare terminal end of described back pressure joint I (202) and back pressure joint II (203), fit in the surface of described groove and entity spool (204) and spool bulge loop (206), slit between groove, entity spool (204), spool bulge loop (206) and the flexible gland (205) forms the fluid passage, and the degree of depth of described groove is 0.1mm-0.3mm.
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| 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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| US20100096138A1 (en) * | 2005-11-18 | 2010-04-22 | Chevron U.S.A. Inc. | Controlling the Pressure Within an Annular Volume of a Wellbore |
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| CN201622270U (en) * | 2010-02-11 | 2010-11-03 | 长江大学 | High-low temperature supercharging curing autoclave |
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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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