CN101769140B - Device for displacing oil underground, preventing reflow and automatically relieving pressure - Google Patents

Device for displacing oil underground, preventing reflow and automatically relieving pressure Download PDF

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Publication number
CN101769140B
CN101769140B CN 201010011531 CN201010011531A CN101769140B CN 101769140 B CN101769140 B CN 101769140B CN 201010011531 CN201010011531 CN 201010011531 CN 201010011531 A CN201010011531 A CN 201010011531A CN 101769140 B CN101769140 B CN 101769140B
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China
Prior art keywords
sealing ball
ball cover
sealing
spring
slide block
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Expired - Fee Related
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CN 201010011531
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Chinese (zh)
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CN101769140A (en
Inventor
蒋海岩
袁士宝
田相雷
曲占庆
齐宁
蔡文斌
吴婷
刘小波
杨海滨
樊波
梁涛
翟恒立
路辉
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Xian Shiyou University
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Xian Shiyou University
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Abstract

The invention discloses a device for displacing oil underground, preventing reflow and automatically relieving pressure, which mainly comprises a body, a sealing ball cover, a sealing ball, a sliding block, a spring, limiting blocks and a spring seat, wherein the body is set into a cylinder shape; the circumferences of the upper part and the lower part of the body are provided with male threads; the inner circumference of the upper part is provided with a plurality of limiting blocks; the inner circumference of the lower part is provided with female threads; the center the upper end part of which is provided with the sealing ball cover is provided with a center hole in the middle of the body; the cylindrical sliding blocks of the sealing ball is arranged at the upper part of the center hole; a spiral spring is arranged at the middle lower part of the center hole; the spring seat which is in threaded connection with the body is arranged at the lower part of the center hole; the middle of the body is provided with a plurality of oil draining holes; the sliding blocks and the body are in movable sealing fit; male threads at the lower end of the body are connected with threads of an outlet pipe of an underground lifting pump; and male threads at the upper end of the body are connected with an oil pipe column. The invention has the advantages of simple structure, reliable sealing, no soft sealing member, long service life, no need of replacement, reduction of times for pulling the oil pipe and well repairing cost economization.

Description

Displacing oil underground, preventing reflow and automatic decompression device
One, technical field
The present invention relates to can in time discharge the excess energy of accumulating in well after a kind of displacing oil underground lifting equipment quits work, prevent backflow, prevent that motor reversal from also can in time release displacing oil underground, preventing reflow and the automatic decompression device of tubing string pressure,
Two, background technology
Drive in lifting crude oil explained hereafter in the down-hole, when shutdown stops production, the energy that accumulates in manufacturing process will discharge, production fluid in fluid generation elastic energy, oil pipe and the external transport pipeline of seasoning in oil pipe and cover tube fluid formation pressure reduction etc. cause driving pump to become hydraulic motor, and this not only damages the also safety of entail dangers to equipment of drive unit component.At present; the oil well that stratum energy is too low; generally can near the surface line well head be installed by an one way valve; prevent from shutting down the rear line fluid oil well is poured in down a chimney phenomenon; an one way valve is installed in upper end at driving arrangement; prevent from shutting down the rear line fluid oil well is poured in down a chimney phenomenon; prevent that the fluid backflow from causing motor reversal; also is furnished with simultaneously bleeder in order to pressure release; when this just requires normally to produce, bleeder has higher seal; and must play bleeder under the flowline offset well after pressure release, increased unnecessary flow chart and unnecessary economic input
Three, summary of the invention
The purpose of this invention is to provide a kind of displacing oil underground, preventing reflow and automatic decompression device, solve the problem that above-mentioned prior art exists.
The present invention mainly is comprised of body, sealing ball cover, ball sealer, slide block, spring, limited block and spring base, it is characterized in that body is made as cylindrical, the upper and lower periphery is provided with male thread, be provided with some limited blocks in top week, in the bottom, week is provided with box thread, the center that the middle part is provided with upper end band sealing ball cover in body is provided with the cylindrical slider that heart hole and centre bore top are provided with ball sealer, the middle and lower part is provided with helical spring, the bottom is provided with the spring base that is threaded with body, is provided with several drainings holes at the middle part of body; Between slide block and body, movable sealing coordinates; Body lower end male thread is threaded with the outlet of down-hole lifting pump, and the upper end male thread is connected with tubing string.
Upper end of slide block section diameter is less than the following diameter in upper end, and the upper end is provided with the gingival cyst of mucous gland in the newborn button, is provided with 45 ° of chamferings in the centre bore upper end.
The sealing ball cover is made as round concave shape, is provided with inside and outside intercommunicating pore in sealing ball cover appearance, sealing ball cover lower end be provided with slide block on the gingival cyst of mucous gland in the newborn button that is complementary of gingival cyst of mucous gland in the newborn button.
The present invention is arranged on the outlet of down-hole lifting pump, when quitting work, lifting pump can prevent backflow, prevent motor reversal, can let out crude oil in oil pipe in sleeve pipe again when oil well operation, when having prevented oil pipe, crude oil in oil pipe is sprayed onto the ground pollution environment, the present invention is simple in structure, sealing is reliable, nothing has soft seal, long service life, need not change, reduce the number of times of an oil pipe, save workover cost.
Four, description of drawings
Accompanying drawing-be a kind of structural representation of the present invention
1-body 2 sealing ball cover 3-ball sealer 4-limited block 5-slide block 6-spring 7-spring base 8-draining hole in figure
Five, the specific embodiment
For further disclosing technical scheme of the present invention, elaborate by embodiment below in conjunction with Figure of description:
The present invention mainly is comprised of body 1, sealing ball cover 2, ball sealer 3, slide block 5, spring 6, limited block 4 and spring base 7, it is characterized in that body 1 is made as cylindrical, the upper and lower periphery is provided with male thread, be provided with some limited blocks 4 in top week, in the bottom, week is provided with box thread, the center that the middle part is provided with upper end band sealing ball cover 2 in body is provided with the cylindrical slider 5 that heart hole and centre bore top are provided with ball sealer 3, the middle and lower part is provided with helical spring 6, the bottom is provided with the spring base 7 that is threaded with body, is provided with several drainings holes at the middle part of body; Between slide block and body, movable sealing coordinates; Body lower end male thread is threaded with the outlet of down-hole lifting pump, and the upper end male thread is connected with tubing string.
1) in the accompanying drawings, the elastic force of choosing spring is greater than or equal to the gravity of slide block and ball valve, and the stress condition that is satisfied is:
f 1≥m 1×g+m 2×g (1)
f 1＝-k×Δx 0 (2)
Wherein, f 1The elastic force of spring 6 during-zero load, N; m 1The quality of-slide block 5, kg; m 2The quality of-ball sealer, kg; The k-device of spring stiffness coefficient, N/m; Δ x 0Reduction length when-spring is unloaded, m; G-acceleration of gravity, 9.8N/kg.
If: A uThe top area of-slide block 5, m 2A dThe bottom area of-slide block 5, m 2A rThe area of-centre bore, m 2
By accompanying drawing A as can be known d=A u(A in fact d〉=A uAll satisfy condition), behind the precalculated position, body two ends can be full of downhole fluid, know the valve body lower portion pressure greater than upper pressure according to pressure formula and the formula (1) of liquid under this device, and at this moment the pressure relief opening of valve is closed.
2) normal production when dropping into beginning
p d＝p out＞＞p u＝ρgh (3)
In formula, p out-pump discharge pressure, P dThe above liquid height of h-device, m.
During the normal production of beginning, the h initial value is very little, and this moment, ball sealer was opened, the fluid of device bottom enters oil pipe through centre bore, by the time downhole fluid is full of oil pipe, and ground begins two ends pressure reduction kept stable after fluid, and in this process, stressing conditions of the present invention is:
f 1+p d×A d＞m 1×g+p u×A uA u (4)
What be in two ends in normal production stressedly satisfies (4) formula all the time, and ball sealer will stay open state, and underground fluid constantly enters valve upper end oil pipe from centre bore, and this moment, the valve pressure relief opening was closed all the time.
3) in pressure leak process:
Set under a well is shut down in the time of maybe can not running well, bottom pressure p of the present invention dBe dropped rapidly near pump inlet pressure owing to losing suddenly pressure energy that Set under a well supplies, the oil pipe inner fluid is because self gravitional force and the elastic energy that overstocks of fluid and pipeline discharge rapidly the very high pressure of formation, fluid will reflux by centre bore and cause ball sealer to be closed rapidly, at this moment p uFar away higher than p dMake two ends of the present invention form very High Pressure Difference, slide block is owing to being subjected to force unbalance to begin to glide, the draining hole is opened, in the oil pipe on top, fluid begins to flow to oil casing annular space from pressure relief opening, until upper end of the present invention stressed be equal to or less than the bottom when stressed slide block up, the draining hole is sealed stops discharge opeing.

Claims (3)

1. a displacing oil underground, preventing reflow and automatic decompression device, mainly by body, the sealing ball cover, ball sealer, slide block, spring, limited block and spring base form, it is characterized in that body is made as cylindrical, the upper and lower periphery is provided with male thread, be provided with some limited blocks in top week, in the bottom, week is provided with box thread, the center that the middle part is provided with upper end band sealing ball cover in body is provided with the cylindrical slider that centre bore and centre bore top are provided with ball sealer, the middle and lower part is provided with helical spring, the bottom is provided with the spring base that is threaded with body, be provided with several drainings holes at the middle part of body, between slide block and body, movable sealing coordinates, body lower end male thread is threaded with the outlet of down-hole lifting pump, and the upper end male thread is connected with tubing string.
2. displacing oil underground, preventing reflow according to claim 1 and automatic decompression device is characterized in that described upper end of slide block section diameter less than the following diameter in upper end, and the upper end is provided with the gingival cyst of mucous gland in the newborn button, are provided with 45 ° of chamferings in the centre bore upper end.
3. displacing oil underground, preventing reflow according to claim 2 and automatic decompression device, it is characterized in that described sealing ball cover is made as round concave shape, be provided with inside and outside intercommunicating pore in sealing ball cover appearance, sealing ball cover lower end be provided with slide block on the gingival cyst of mucous gland in the newborn button that is complementary of gingival cyst of mucous gland in the newborn button.
CN 201010011531 2010-01-07 2010-01-07 Device for displacing oil underground, preventing reflow and automatically relieving pressure Expired - Fee Related CN101769140B (en)

Priority Applications (1)

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CN 201010011531 CN101769140B (en) 2010-01-07 2010-01-07 Device for displacing oil underground, preventing reflow and automatically relieving pressure

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Application Number Priority Date Filing Date Title
CN 201010011531 CN101769140B (en) 2010-01-07 2010-01-07 Device for displacing oil underground, preventing reflow and automatically relieving pressure

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102720460A (en) * 2012-06-08 2012-10-10 中国石油集团川庆钻探工程有限公司 Float collar structure in spherical and conical sealing fit
CN106122004A (en) * 2016-08-10 2016-11-16 姜经志 Sand discharge pressure release single flow device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1737331A (en) * 2005-09-09 2006-02-22 康杰 Automatic pressure relief ball seat
CN2789408Y (en) * 2005-03-02 2006-06-21 代旭升 Automatic decompression type valve swab
CN2846732Y (en) * 2005-09-24 2006-12-13 辽河石油勘探局 Non-casting ball type blocking pressure signle flow device
CN201193506Y (en) * 2008-04-30 2009-02-11 大庆油田有限责任公司 Blowout prevention pressure test oil drainage switch
CN201206457Y (en) * 2008-05-28 2009-03-11 陈剑波 Flow dividing valve

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9124486D0 (en) * 1991-11-18 1992-01-08 Appleton Robert P Downhole tools(wells)

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2789408Y (en) * 2005-03-02 2006-06-21 代旭升 Automatic decompression type valve swab
CN1737331A (en) * 2005-09-09 2006-02-22 康杰 Automatic pressure relief ball seat
CN2846732Y (en) * 2005-09-24 2006-12-13 辽河石油勘探局 Non-casting ball type blocking pressure signle flow device
CN201193506Y (en) * 2008-04-30 2009-02-11 大庆油田有限责任公司 Blowout prevention pressure test oil drainage switch
CN201206457Y (en) * 2008-05-28 2009-03-11 陈剑波 Flow dividing valve

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