CN105696968A - Automatic grouting float collar and float shoe - Google Patents
Automatic grouting float collar and float shoe Download PDFInfo
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- CN105696968A CN105696968A CN201610172600.5A CN201610172600A CN105696968A CN 105696968 A CN105696968 A CN 105696968A CN 201610172600 A CN201610172600 A CN 201610172600A CN 105696968 A CN105696968 A CN 105696968A
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- float collar
- float shoe
- flow control
- control valve
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- 230000007246 mechanism Effects 0.000 claims abstract description 23
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- 230000008859 change Effects 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 12
- 229920000459 Nitrile rubber Polymers 0.000 claims abstract description 8
- 239000002131 composite material Substances 0.000 claims abstract description 4
- 239000004567 concrete Substances 0.000 claims description 26
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- 230000032683 aging Effects 0.000 claims description 10
- 229920001971 elastomer Polymers 0.000 claims description 9
- 239000003208 petroleum Substances 0.000 claims description 9
- 238000004513 sizing Methods 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 6
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- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 5
- 239000004568 cement Substances 0.000 claims description 4
- 235000013312 flour Nutrition 0.000 claims description 4
- 239000010438 granite Substances 0.000 claims description 4
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- KPAPHODVWOVUJL-UHFFFAOYSA-N 1-benzofuran;1h-indene Chemical compound C1=CC=C2CC=CC2=C1.C1=CC=C2OC=CC2=C1 KPAPHODVWOVUJL-UHFFFAOYSA-N 0.000 claims description 3
- 235000021355 Stearic acid Nutrition 0.000 claims description 3
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- 239000000084 colloidal system Substances 0.000 claims description 3
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- 150000002148 esters Chemical class 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
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- 238000000465 moulding Methods 0.000 claims description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 3
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- 238000005987 sulfurization reaction Methods 0.000 claims description 3
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- 238000005260 corrosion Methods 0.000 abstract description 7
- 238000005553 drilling Methods 0.000 abstract description 3
- 238000010008 shearing Methods 0.000 abstract 4
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L15/00—Compositions of rubber derivatives
- C08L15/005—Hydrogenated nitrile rubber
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Organic Chemistry (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Lift Valve (AREA)
Abstract
The invention discloses an automatic grouting float collar and a float shoe. The automatic grouting float collar and the float shoe are characterized in that sleeve threads are processed at the upper and lower ends of a float collar body; a guide cap is mounted at the lower end of a float shoe body; a stop valve seat is connected onto the inner wall of each of the float collar body and the float shoe body; a stop valve is mounted below each stop valve seat; the sealing surface of each valve body is a spherical surface; a shearing mechanism and a flow control valve are fixedly and hermetically connected onto the inner wall, below each stop valve seat, of each of the float collar body and the float shoe body through high-strength concrete; each flow control valve is positioned below the corresponding shearing mechanism, is a circular ring with a stepped flow guiding hole formed in the middle, and is manufactured through nitrile butadiene rubber and an annular ring composite material; each shearing mechanism comprises an inner sleeve and an outer sleeve; dowels are arranged between each inner sleeve and the corresponding outer sleeve; and an alloying pellet is placed in each shearing mechanism. According to the automatic grouting float collar and the float shoe, during drilling operation, the mud grouting amount can be automatically adjusted along with the underground pressure change, so that the pressure at the bottom of the well is maintained to be balanced and stable, and the leakage phenomenon caused by surge pressure during the sleeve installation process is effectively avoided, the corrosion resistance is realized, and the cementing quality is high.
Description
Technical field
The present invention relates to petroleum tool technical field, particularly a kind of oil, the automatic grouting float collar in natural gas drilling process, float shoe。
Background technology
Float collar, float shoe are as important casing hardware, and its reliability directly influences cementing quality。At present, existing float collar, float shoe mainly by body, current limiting plate, end the compositions such as valve seat, alloying pellet, guiding cap。
The utility model patent of China Patent No. 03269873.9 discloses the float collar of a kind of automatic grouting reverse flow limiting, float shoe, on float collar body, lower end or the processing of float shoe upper end have the casing threads coupled with petroleum casing pipe, float shoe body lower end is equipped with hemispherical rounded cap (i.e. guiding cap), inner body wall is coupled by straight thread and has non-return valve seat, non-return valve seat is arranged below check-valves, in inner body wall, lock pin inner sleeve is encapsulate by cement mortar is affixed below check-valves, the flap locking mechanism of lock pin overcoat and pressure limiting pin composition and current limiting plate, current limiting plate offers pod apertures。
In above-mentioned prior art, there are the following problems for product structure:
1. cannot realizing automatic current limiting: current limiting plate material mostly is steel material, pod apertures size cannot be deformed to necessary requirement in mud cyclic process, so mud is uncontrollable in the upper regurgitation volume of annular space, upward velocity, reverse flow limiting time。
2. material mostly is steel pipe and steel plate structure, and drillability is poor, and it is perishable thus causing seal failure that sealing surface is exposed in sour environment。
Summary of the invention
For the drawbacks described above solving existing float collar, float shoe exists, it is an object of the invention to provide a kind of float collar float plug, can automatic grouting, automatic current limiting, sealing and drillability are good, high temperature resistant, corrosion-resistant, reduce drilling time, this invention address that above-mentioned technical problem is achieved through the following technical solutions:
A kind of automatic grouting float collar, float shoe, described float collar and float shoe are connected by petroleum casing pipe, it includes float collar body and float shoe body, float collar body and float shoe inner body wall are coupled by straight thread and has cut-off valve seat, the processing of described cut-off valve seat endoporus has inclined-plane as sealing surface, described cut-off valve seat is arranged below stop valve, valve body sealing surface is sphere, on described float collar body and float shoe inner body wall, cutting mechanism and flow control valve is encapsulate by strong concrete is affixed below described cut-off valve seat, described flow control valve is positioned at below cutting mechanism, described cutting mechanism is divided into inside and outside sleeve, pin is had between inside and outside sleeve, throw in described cutting mechanism and have alloying pellet, described flow control valve is the annulus that centre offers stepped pod apertures, it is made up of nitrile rubber and ring spring composite, its hardness is HS70 ± 5, hot strength >=16Mpa, elongation rate of tensile failure >=400%, 70 DEG C × 24h≤30% of compression set, tearing strength >=30KN/m, brittleness temperature≤-40 DEG C, firmness change HS under 70 DEG C × 168h of hot air aging≤± 6, hot strength >=13Mpa, elongation rate of tensile failure >=320%, ozone aging 50 × 10-8: 20%, (40 ± 2) DEG C × 48h flawless。
Further, the preparation method of described flow control valve is: (1), by hydrogenated butyronitrile 70%, zinc oxide 10%, stearic acid 3%, age resistor 2.5%, coumarone indene resin 6%, dibutyl ester 3%, filler 3.5% is stand-by as sizing material after parking 24 hours after mixing banburying；(2) mill put into by sizing material, adds accelerator: sulfur 2%, park after entering filter after opening refining 24 hours stand-by；(3) bar is divided to enter extruder for shaping by opening the sheet rubber refined: roughly the same with product cross section size stand-by；(4) sulfuration: first by extrusion molding colloid mould molding, and putting into ring spring, the semi-finished product of forming are put into shaper hydraulic mould-matching after being warmed up to 160 DEG C by vulcanizer, vulcanize 18 minutes, and depanning is stand-by；(5) post-cure sizing: baking box is warmed up to 130 DEG C, natural cooling after vulcanizing 8 hours；(6) product removes overlap, burr；(7) detection overall dimensions and physical property, warehousing after passing。
Further, the processing of described float collar body upper and lower end has the casing threads coupled with petroleum casing pipe。
Further, the processing of described float shoe body upper end has the casing threads coupled with petroleum casing pipe, and lower end is equipped with guiding cap。
Further, the outward flange of described flow control valve is provided with certain taper。
Further, a circle it is provided with bottom described flow control valve protruding。
Further, the main component of described strong concrete includes: G-level high oil-resistant well cement 25wt%, extender 0.5wt%, silica flour 3wt%, early strength agent 0.5wt%, quartz sand 25wt%, granite aggregate chips 38wt% and water 8wt%。
The feature of the present invention and beneficial effect:
A. automatic grouting design: automatic grouting process is controlled by stop valve and flow control valve。Stop valve is in opening in setting of casing process, and in setting of casing process, mud is entered in sleeve pipe by stop valve and flow control valve。Can reduce the mud amount of returning and upward velocity on annular space, reduce sleeve pipe surge to shaft bottom in decentralization process, be prevented effectively from setting of casing process the leakage caused due to surge pressure。Without setting of casing midway mud grouting, casing job can be continuously performed, save the engineering time, it is to avoid occur owing to filling process middle sleeve pauses cutting ferrule to run affairs former。
B. adopting automatic current limiting design: flow-control valve outlet port is flexible, outlet diameter can become greatly with pressure change or reduce, thus controlling pressure balance。Automatically adjust mud grouting amount by flow control valve according to down-hole pressure change, make shaft bottom keep pressure balance, stablize。Sleeve pipe, after desired depth, can automatically form sealing by throwing in alloying pellet, it is prevented that cement mortar flows backwards, convenient and reliable operation。
C. drillability is good, corrosion-resistant: except float collar, this external key fitment of float shoe are non-metallic material, drillability designs, and conventional roller cone drill bit can be used directly to creep into, and improves efficiency of construction。Contacting material therefor with soda acid is aluminium alloy, nitrile rubber etc., corrosion-resistant, thus good airproof performance。
D. strong concrete makes float collar, float shoe good seal performance, comprcssive strength height, permeability resistance good。
E. the flow control valve made with nitrile rubber for primary raw material, water-fast, oil resistant, heat-resisting, wear-resisting, cohesive force is strong, and air-tightness is good, can use under the extreme condition of high temperature, high pressure and height oil。
The Automation Design is the distinguishing feature of product。
Accompanying drawing explanation
Fig. 1 is float collar structural representation of the present invention；
Fig. 2 is float shoe structural representation of the present invention；
Fig. 3 is the cross-sectional view that inventive flow controls valve；
1. float collar body；2. cut-off valve seat；3. stop valve；4. cutting mechanism；5. alloying pellet；6. flow control valve；7. strong concrete；8. guiding cap；11. float shoe body。
Detailed description of the invention
Below in conjunction with accompanying drawing, float collar of the present invention, float shoe are made detailed description。
As depicted in figs. 1 and 2, float collar of the present invention includes float collar body 1, ends valve seat 2, stop valve 3, cutting mechanism 4, alloying pellet 5 and flow control valve 6, float shoe of the present invention includes float shoe body 11, ends valve seat 2, stop valve 3, cutting mechanism 4, alloying pellet 5, flow control valve 6 and guiding cap 8, the present invention is on float collar body 1, lower end and the processing of float shoe body 11 upper end have the casing round thread or buttress casing thread that couple with petroleum casing pipe, and float shoe body 11 lower end is equipped with guiding cap 8, float collar body 1, being coupled by straight thread on float shoe body 11 inwall and have cut-off valve seat 2, in cut-off valve seat 2, hole machined has inclined-plane as sealing surface, and cut-off valve seat 2 is arranged below stop valve 3, and stop valve is mainly by valve body, gyroaxis, torsion springs etc. form, and valve body sealing surface is sphere, float collar body 1 below cut-off valve seat 2, float shoe body 11 inwall encapsulates cutting mechanism 4 and flow control valve 6 by strong concrete 7 is affixed, flow control valve 6 is in order to regulate fluid flow, along with down-hole casing external and internal pressure change, the outlet diameter of flow control valve 6 can along with change, thus controlling pressure balance and flow。Cutting mechanism 4 is divided into inside and outside sleeve, has pin between inside and outside sleeve。Alloying pellet can be rendered in cutting mechanism seat by wellhead casing pipe at reasonable time, and alloying pellet 5 can move down under external force, and cutting mechanism 4 plays a role, and stop valve 3 is automatically switched off, and can effectively control extratubal fluid and flow back in pipe。
Float collar body 1 of the present invention, float shoe body 11 be 35CrMo material, conditioned process, modified heating-up temperature 840-860 DEG C, temperature retention time 1.2-1.5 hour。Cut-off valve seat 2 is high-strength aluminum alloy, and stop valve 3 is high-strength aluminum alloy, and cutting mechanism 4 main material is high-strength aluminum alloy, and alloying pellet 5 is aluminium alloy, and the special guiding cap 8 of float shoe is HT200 material。
Owing to being under extreme conditions, use when High Temperature High Pressure and height oil, inventive flow controls the valve 6 change in order to ensure its outlet diameter, need significantly high performance could meet the requirement of float collar float plug flow valve, the flow control valve 6 of float collar float plug of the present invention is the middle annulus offering stepped pod apertures, its outward flange is provided with certain taper, and effect is to make flow control valve 6 cylindrical and concrete better combine, it is prevented that it is operationally peeled off from concrete and lost efficacy；Being provided with a circle bottom it protruding, effect is the deformation amount controlling of the rubber inner ring in this projection, tries one's best Reducing distortion in protruding outer ring, operationally loses efficacy from peeling off concrete also for preventing it。
Flow control valve 6 is made up of nitrile rubber and ring spring composite, and ring spring is looped around the pod apertures place of flow control valve, and the addition of ring spring adds elasticity and the fatigue resistance of rubber。Concrete step of preparation process is as follows:
(1) by hydrogenated butyronitrile 70%, zinc oxide 10%, stearic acid 3%, age resistor 2.5%, coumarone indene resin 6%, dibutyl ester 3%, filler 3.5% is stand-by as sizing material after parking 24 hours after mixing banburying；
(2) mill put into by sizing material, adds accelerator: sulfur 2%, enter after opening refining filter filter 24 hours stand-by；
(3) bar is divided to enter extruder for shaping by opening the sheet rubber refined: roughly the same with product cross section size stand-by；
(4) sulfuration: first by extrusion molding colloid mould molding, and putting into ring spring, the semi-finished product of forming are put into shaper hydraulic mould-matching after being warmed up to 160 DEG C by vulcanizer, vulcanize 18 minutes, and depanning is stand-by；
(5) post-cure sizing: baking box is warmed up to 130 DEG C, natural cooling after vulcanizing 8 hours；
(6) product removes overlap, burr；
(7) detection overall dimensions and physical property, warehousing after passing。
The physical property of the flow control valve of required detection include hardness (Shao Er A)/degree, hot strength/MPa, elongation rate of tensile failure/%, compression set, tearing strength/(KN/m), brittleness temperature/DEG C, hot air aging, the project such as ozone aging, projects used test method is as follows:
1. hardness test device therefor is shore A type hardness tester meter, is placed on by sample under this durometer, calculates the size of Shore A hardness according to the extension elongation L of product, and Shore A hardness calculates formula: HA=100-L/0.025；
2. hot strength test device therefor is rubber tensile strength tester, selects temperature, humidity, test speed, the hot strength/MPa of test sample；
3. elongation rate of tensile failure test device therefor is rubber elongation rate of tensile failure test machine, selects the parameters such as load measuring gauge, strength amplification, speed, the elongation rate of tensile failure/% of record sample；
4. compression set test device therefor is rubber compression set tester, sample temperature be 70 DEG C, humidity be 25% when compression 24h, test its compression set rate；
5. tearing strength test device therefor is tearing strength tester, by specimen clamping between two chucks of fixture, two chucks do relative motion, by being positioned at force value sensor on dynamic chuck and the built-in displacement transducer of machine, collect the force value change in process of the test and change in displacement, thus calculating tearing strength/(KN/m) of sample；
6. brittleness temperature test device therefor is rubber black brittleness temperature measuring device, selects-40 DEG C of-0 DEG C of temperature ranges, is clamped by sample clamper, be placed on test base, maintenance 3min, startup drift, impact specimen, the brittleness temperature of test product/DEG C；
7. hot air aging test device therefor is air oven aging test case, and the parameters such as 168h, the firmness change (shore A) of test product/degree, hot strength/MPa, elongation rate of tensile failure/% placed by sample when temperature is 70 DEG C；
8. ozone aging test device therefor is ozone aging test box, and sample is 50 × 10 at ozone concentration-8, humidity is 20%, places 48h, observe and have flawless when temperature is (40 ± 2) DEG C。
Through above-mentioned test, the performance indications that the float collar float plug produced can reach are as follows:
Product appearance non-trimming, burr, overall dimensions is qualified。
Carrying out stress test after being assembled by float collar float plug, this test carries out in product development stage, it is therefore an objective to situation during simulation mud grouting, the performance test that flow control valve 6 voltage stabilizing is carried out。Float collar, float shoe female thread plug being blocked during test, middle processing pressure testing inlet opening, now stop valve 3 is in opening, and flow control valve 6 end is without closure。Tested media is clear water, and pressure testing equipment is accumulator。Test product connects accumulator, accumulator distance product height 10m by intervening vaive。, when accumulator opens accumulator valve after storing full water, start to test to product water filling, owing to interiors of products produces pressure effect so that flow control valve elasticity of export deforms, diameter increases, and flow increases therewith。When water level reduces pressure reduction, outlet diameter reduces, and flow reduces therewith, and when water level reduces further, outlet diameter recovers original size。Water drains the time about 150 seconds。
Being made of a steel equivalently-sized contrast product and carry out same test, rate of discharge is without significant change, and water drains the time about 220 seconds。
This float collar float plug is in actual production process, and float collar float plug and casing string are connected, and when setting of casing speed changes, sleeve pipe external and internal pressure can change therewith。Due to the effect of flow control valve 6, the outer mud of sleeve pipe can pass through flow control valve 6 mesopore and flow into cannula cavity。When sleeve pipe external pressure increases, flow control valve outlet diameter increases, so that external and internal pressure is quickly close to balance, thus reducing sleeve pipe surge to shaft bottom in decentralization process。
Strong concrete 7 comprcssive strength is high, permeability resistance is good, stable chemical performance, and the main component of strong concrete 7 is as follows:
A.G level high resistance oil-well cement: be characterized as being and make quick solidifying after concrete, has good impermeability, stability and corrosion resistance after solidification。
B. extender: extender joins in concrete, makes concrete produce appropriateness and expands, set up compressive pre-stress in the structure, and this compressive pre-stress can be substantially balanced out the shrinkage tensile stress that concrete produces in hardening process, meanwhile, has postponed the production process shunk。When concrete starts to shrink at, its stretching resistance has been enough to resist shrinkage stress, thus preventing or reducing later concrete shrinkage cracking；Substantially increase the anti-crack and anti-seepage performance of xoncrete structure。
C. silica flour: its effect is to reduce the pore-size in aquation slurry, improves pore size distribution, makes concrete strength improve, permeability reduction。
D. early strength agent: Main Function is in that to accelerate hydrated cementitious speed, promotes the development of early age strength of concrete;Both there is early powerful, there is again certain water reducing and strength increasing function。
E. quartz sand: quartz sand is hard, wear-resisting, stable chemical performance。Dry stand-by after removing foreign material clean water。
F. granite aggregate chips: specification 3-5mm, stand-by after removing foreign material。
Strong concrete 7 is set in the manufacturing process on float collar body 1, float shoe body 11 and test is as follows:
(1) water adding 8% after mixing by above each composition G-level high oil-resistant well cement 25% by weight proportion, extender 0.5%, silica flour 3%, early strength agent 0.5%, quartz sand 25%, granite aggregate chips 38%, stirs;
(2) concrete is filled on float collar body 1, float shoe body 11 by specific purpose tool, consolidation by vibrating, solidification。
(3) position combined at cut-off valve seat 2, cutting mechanism 4, flow control valve 6 and concrete is coated with 901 building adhesives, and adds firming agent and accelerator。
(4) detection: detected concrete sealing property and intensity by pressure testing。
(5) close float collar, float shoe bottom by frock, only stay pressure testing hole, close stop valve 3, carry out the water pressure test according to the pressure rating that different size is determined。Voltage stabling control was no less than 5 minutes, and pressure drop, less than 0.5MPa, is revealed as qualified without visible。
Operationally, sleeve pipe is after desired depth, and small displacement turn on pump gets through mud for float collar, float shoe, dismantles circulating connection and puts in sleeve pipe by alloying pellet, connect circulating connection and continue cycling through after circulating one week。Alloying pellet drops in cutting mechanism inner sleeve with mud and deadweight, is sealed by inner sleeve, makes circulating pressure raise, when pressure reaches 2.8-4.2MPa, the pin between inside and outside sleeve is cut off, and stop valve departs from inner sleeve restriction, it is automatically switched off under torsion spring effect, seals。Simultaneously alloying pellet leaves float collar, under be advanced into float shoe and repeat said process, stop valve is closed, seals。Now realize reverse flow limiting。
Only need to manually throwing in an alloying pellet 5 in this product use procedure, all the other actions are automatically performed by product。Automatic grouting, automatic current limiting, hand off, to operation, this product personnel do not have special technology requirement, and the Automation Design is the distinguishing feature of product。
The feature of the present invention with have the beneficial effect that
A. automatic grouting design: automatic grouting process is controlled by stop valve and flow control valve。Stop valve is in opening in setting of casing process, and in setting of casing process, mud is entered in sleeve pipe by stop valve and flow control valve。The present invention can reduce the mud amount of returning and upward velocity on annular space, reduces sleeve pipe surge to shaft bottom in decentralization process, is prevented effectively from setting of casing process the leakage caused due to surge pressure。The present invention, without setting of casing midway mud grouting, can continuously perform casing job, save the engineering time, it is to avoid occur cutting ferrule to run affairs owing to filling process middle sleeve pauses former。
B. adopting automatic current limiting design: flow-control valve outlet port is flexible, outlet diameter can become greatly with pressure change or reduce, thus controlling pressure balance。The present invention can adjust mud grouting amount by flow control valve according to down-hole pressure change automatically, makes shaft bottom keep pressure balance, stablize。Sleeve pipe, after desired depth, can automatically form sealing by throwing in alloying pellet, it is prevented that cement mortar flows backwards, convenient and reliable operation。
C. drillability is good, corrosion-resistant: except float collar, this external key fitment of float shoe are non-metallic material, drillability designs, and conventional roller cone drill bit can be used directly to creep into, and improves efficiency of construction。Contacting material therefor with soda acid is aluminium alloy, nitrile rubber etc., corrosion-resistant, thus good airproof performance。
D. strong concrete makes float collar, float shoe good seal performance, comprcssive strength height, permeability resistance good。
E. the flow control valve made with nitrile rubber for primary raw material, water-fast, oil resistant, heat-resisting, wear-resisting, cohesive force is strong, and air-tightness is good, can use under the extreme condition of high temperature, high pressure and height oil。
Above example only in order to technical scheme to be described, is not intended to limit；Although the present invention being described in detail with reference to previous embodiment, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein portion of techniques feature is carried out equivalent replacement；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme。
Claims (7)
1. an automatic grouting float collar, float shoe, described float collar and float shoe are connected by petroleum casing pipe, it is characterized in that: it includes float collar body (1) and float shoe body (11), described float collar body (1) and float shoe body (11) inwall are coupled by straight thread and has cut-off valve seat (2), the interior hole machined of described cut-off valve seat (2) has inclined-plane as sealing surface, described cut-off valve seat (2) is arranged below stop valve (3), valve body sealing surface is sphere, described cut-off valve seat (2) lower section encapsulates cutting mechanism (4) and flow control valve (6) by strong concrete (7) is affixed on described float collar body (1) and float shoe body (11) inwall, described flow control valve (6) is positioned at cutting mechanism (4) lower section, described cutting mechanism (4) is divided into inside and outside sleeve, pin is had between inside and outside sleeve, throw in described cutting mechanism (4) and have alloying pellet (5), described flow control valve (6) is the middle circular ring structure offering stepped pod apertures, it is made up of nitrile rubber and ring spring composite, its hardness is HS70 ± 5, hot strength >=16Mpa, elongation rate of tensile failure >=400%, 70 DEG C × 24h≤30% of compression set, tearing strength >=30KN/m, brittleness temperature≤-40 DEG C, firmness change HS under 70 DEG C × 168h of hot air aging≤± 6, hot strength >=13Mpa, elongation rate of tensile failure >=320%, ozone aging 50 × 10-8: 20%, (40 ± 2) DEG C × 48h flawless。
2. automatic grouting float collar according to claim 1, float shoe, it is characterized in that: described prepare flow control valve (6) step be: (1) is by hydrogenated butyronitrile 70%, zinc oxide 10%, stearic acid 3%, age resistor 2.5%, coumarone indene resin 6%, dibutyl ester 3%, filler 3.5% is stand-by as sizing material after parking 24 hours after mixing banburying；(2) mill put into by sizing material, adds accelerator: sulfur 2%, park after entering filter after opening refining 24 hours stand-by；(3) bar is divided to enter extruder for shaping by opening the sheet rubber refined: roughly the same with product cross section size stand-by；(4) sulfuration: first by extrusion molding colloid mould molding, and putting into ring spring, the semi-finished product of forming are put into shaper hydraulic mould-matching after being warmed up to 160 DEG C by vulcanizer, vulcanize 18 minutes, and depanning is stand-by；(5) post-cure sizing: baking box is warmed up to 130 DEG C, natural cooling after vulcanizing 8 hours；(6) product removes overlap, burr；(7) detection overall dimensions and physical property, warehousing after passing。
3. automatic grouting float collar according to claim 1, float shoe, it is characterised in that: described float collar body (1) upper and lower end processing have and petroleum casing pipe couple casing threads。
4. automatic grouting float collar according to claim 1, float shoe, it is characterised in that: described float shoe body (11) upper end processing have and petroleum casing pipe couple casing threads, lower end is provided with guiding cap (8)。
5. automatic grouting float collar according to claim 1, float shoe, it is characterised in that: the outward flange of described flow control valve (6) is provided with certain taper。
6. automatic grouting float collar according to claim 5, float shoe, it is characterised in that: it is protruding that described flow control valve (6) bottom is provided with a circle。
7. automatic grouting float collar according to claim 1, float shoe, it is characterised in that: the main component of described strong concrete (7) including: G-level high oil-resistant well cement 25wt%, extender 0.5wt%, silica flour 3wt%, early strength agent 0.5wt%, quartz sand 25wt%, granite aggregate chips 38wt% and water 8wt%。
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| CN201510515127.1A CN105134128A (en) | 2015-08-21 | 2015-08-21 | Automatic grouting float collar and float shoe |
| CN2015105151271 | 2015-08-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109233291A (en) * | 2018-09-18 | 2019-01-18 | 威固技术（安徽）有限公司 | A kind of high temperature resistant and antifatigue dynamic vibration absorber material and preparation method thereof |
| CN111980620A (en) * | 2020-09-15 | 2020-11-24 | 东营市正能石油科技有限公司 | Oil field is filling instrument in pit |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105134128A (en) * | 2015-08-21 | 2015-12-09 | 刘书京 | Automatic grouting float collar and float shoe |
| CN106514831B (en) * | 2015-09-15 | 2020-02-18 | 中国石油化工股份有限公司 | Method for manufacturing floating device |
| US10107072B2 (en) * | 2016-03-15 | 2018-10-23 | Tercel Oilfield Products Usa Llc | Toe valve |
| CN113006734A (en) * | 2021-03-22 | 2021-06-22 | 中国石油天然气集团有限公司 | Ball-throwing type floating ball type self-grouting float collar and continuous uninterrupted casing running method |
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| US3776250A (en) * | 1972-04-13 | 1973-12-04 | Halliburton Co | Float collar with differential fill feature |
| CN103289148A (en) * | 2013-04-26 | 2013-09-11 | 焦作市万瑞轮胎辅料有限公司 | Reciprocating-motion rubber sealing ring and production technology thereof |
| CN203488143U (en) * | 2013-10-09 | 2014-03-19 | 刘书京 | Automatic mud grouting float-collar float shoe |
| CN105134128A (en) * | 2015-08-21 | 2015-12-09 | 刘书京 | Automatic grouting float collar and float shoe |
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2015
- 2015-08-21 CN CN201510515127.1A patent/CN105134128A/en active Pending
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|---|---|---|---|---|
| US3776250A (en) * | 1972-04-13 | 1973-12-04 | Halliburton Co | Float collar with differential fill feature |
| CN103289148A (en) * | 2013-04-26 | 2013-09-11 | 焦作市万瑞轮胎辅料有限公司 | Reciprocating-motion rubber sealing ring and production technology thereof |
| CN203488143U (en) * | 2013-10-09 | 2014-03-19 | 刘书京 | Automatic mud grouting float-collar float shoe |
| CN105134128A (en) * | 2015-08-21 | 2015-12-09 | 刘书京 | Automatic grouting float collar and float shoe |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109233291A (en) * | 2018-09-18 | 2019-01-18 | 威固技术（安徽）有限公司 | A kind of high temperature resistant and antifatigue dynamic vibration absorber material and preparation method thereof |
| CN111980620A (en) * | 2020-09-15 | 2020-11-24 | 东营市正能石油科技有限公司 | Oil field is filling instrument in pit |
| CN111980620B (en) * | 2020-09-15 | 2022-01-11 | 东营中达石油设备有限公司 | Oil field is filling instrument in pit |
Also Published As
| Publication number | Publication date |
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| CN105696968B (en) | 2017-05-10 |
| CN105134128A (en) | 2015-12-09 |
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Effective date of registration: 20171116 Address after: 053300 Xin Kai street, Wuqiang Town, Wuqiang County, Hengshui, Hebei Patentee after: Beijing Jinghong petroleum drilling & Engineering Technology Co., Ltd. Address before: No. 1450 Shengdong Road, Hengshui, Hebei Province Patentee before: Liu Shujing |