CN106150447A - A kind of roofbolt controls payzone recognition methods - Google Patents
A kind of roofbolt controls payzone recognition methods Download PDFInfo
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- CN106150447A CN106150447A CN201510164295.0A CN201510164295A CN106150447A CN 106150447 A CN106150447 A CN 106150447A CN 201510164295 A CN201510164295 A CN 201510164295A CN 106150447 A CN106150447 A CN 106150447A
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- standing valve
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Abstract
The invention discloses a kind of roofbolt and control payzone recognition methods, initial stage interchangeable layer oil extraction pump standing valve passage is opened, pump plunger and barrel pumping produces, sucker rod is transferred when changing layer, first sucker rod is connected with layer pump that change of down-hole, then sucker rod is transferred, described sucker rod drives plunger descending, lower pressure commutation orbits controlling mechanism, and orbits controlling mechanism of commutating drives flow-dividing control mechanism indirect type to be in two different high point, described flow-dividing control mechanism by the control of orbits controlling mechanism can respectively with upper standing valve production system, lower standing valve production system connects, thus the residue length difference of sucker rod directly judges the condition of commutation of down-hole switch on the ground when realizing touching pump by twice.When the present invention can pass through to touch pump for twice at the scene, the residue length difference of polished rod directly judges the production layer position of down-hole interchangeable layer oil production tube type pump and changes a layer situation, substantially increase change layer and produce reliability, intuitive, avoid because ground cannot intuitive judgment downhole production layer position and change a layer situation, the possibility of layer situation can only be changed by producing checking.
Description
Technical field
The present invention relates to petroleum industry formation testing by layer technology, specifically a kind of roofbolt controls payzone recognition methods.
Background technology
At present, China's major part oil well is multiple series of strata, and interlayer difference is big, interlayer employs unbalanced oil well needs to use
Separate zone oil production process pipe string carries out separate zone production.Monoblock type separate zone oil production process pipe string has that construction is simple, card envelope is reliable
Advantage, obtains large-scale application at each elephant, but can only realize card and seal one layer and produce other one layer, when needing to change layer
Original production tubing string to be tripped out, enters down flow string, and work operations amount is big.Routine is changed after a layer mode change layer, ground without
Method intuitively shows, it is impossible to judge down-hole switch changes a layer situation, is only capable of being produced layer position by condition of production checking and being changed a layer feelings
Condition, it is impossible to meet Pressure Curve in Oil Testing Well and accurately ask the technology requirement of product.It is North China Oilfield that unique Master's thesis is thanked to by China University Of Petroleum Beijing
Have developed a kind of fixed tubular column layering production technology, change a layer feelings by what geostatic pressure flow tester judged down-hole switch
Condition.This pressure flow tester is connected between sleeve pipe and pump truck, and test real-time data transmission preserves to computer, by skill
Art personnel explain test result, changes a layer situation by what pressure and changes in flow rate judged down-hole seam change switch.This skill
Art can not judge to change a layer situation in scene intuitively, need to be analyzed identifying well to test result by professional and technical personnel
The situation of lower seam change switch, operation complexity.The fixed tubular column layering production technology of Patent No. CN101906948 A, develops
A kind of layer mining converter of defueling pump, touches impulsive force during pump 2 times by oil pump plunger piston, it is achieved separate zone production, but
Also cannot realize ground visible display down-hole switch changes a layer situation.The sucker rod of Patent No. CN104213884 A controls formula
Fixed tubular column layering production method, utilizes the sucker rod on pumpingh well ground to exploit two intervals to control downhole pump rotation,
The most also cannot realize ground visible identification down-hole switch changes a layer situation.
Therefore, a kind of roofbolt of invention controls payzone recognition methods, while realizing oil reservoir machinery layering production, again can
Clearly judge to change a layer working condition, improve fixed tubular column and change the reliability of layer.
Summary of the invention
It is an object of the invention to provide a kind of roofbolt and control payzone recognition methods, carry out machinery card envelope oil production by layer technique
Time, pump can be touched by handling sucker rod and realize interchangeable layer oil extraction pump change correspondence production layer position, realization are changed layer and produced, and
And the different life directly judging down-hole interchangeable layer oil production tube type pump of residue length of polished rod when can pass through to touch pump for twice at the scene
Payzone position and change a layer situation, substantially increase change layer and produce reliability, intuitive, it is to avoid because ground cannot be directly perceived
Judge downhole production layer position and change a layer situation, the possibility of layer situation can only be changed by producing checking.
In order to reach above-mentioned purpose, present invention employs following technical scheme, a kind of roofbolt controls payzone recognition methods,
With packer, upper and lower two-layer is separated under oil well pump, form upper and lower two payzones, utilize upper and lower standing valve to produce system
The most corresponding upper and lower two payzones of system, the wherein one layer of production of initial stage correspondence, when changing layer production, transfer sucker rod, at bullet
Under spring effect drive plunger, commutation ratchet descending, lower pressure commutation orbits controlling mechanism, be in two different low spots, change
Driving flow-dividing control mechanism indirect type to be in two different high point to orbits controlling mechanism, described flow-dividing control mechanism passes through
The control of orbits controlling mechanism can connect with upper standing valve production system, lower standing valve production system respectively, thus real
Time now by touching pump for twice, the residue length difference of sucker rod directly judges the condition of commutation of down-hole switch on the ground.
Described orbits controlling mechanism, flow-dividing control mechanism, upper standing valve production system are successively set on pump barrel from top to bottom
Bottom, is provided with lower standing valve production system pump barrel by connecting the most successively outside fixed valve production system
The union joint that connects, spring housing, connector, outer tube, described flow-dividing control mechanism includes inner central tube and is enclosed within inner central tube
On spring, on the shoulder outside described spring upper end fore-set inner central tube upper end, lower end then withstands on connector upper surface,
The outside of spring is spring housing, and described orbits controlling mechanism is positioned at inside union joint, and described orbits controlling mechanism includes commutation
Track, change, track pin, described commutation track lower end withstands on inner central tube, arranges at commutation track lower end outside
There is change and be equipped with the track pin of location.
Fixed valve production system includes isocon, upper standing valve cover, arranges bottom the internal layer of described isocon
Plug, outer bottom then connects upper standing valve cover, and described isocon internal layer upper end is offered to produce and portalled；Described
Lower standing valve production system includes interconnective standing valve shunting body, lower standing valve cover, described standing valve shunting body
Upper end is connected with outer tube, connects lower contact, shape between described isocon upper end and connector bottom described lower standing valve cover
Lower production is become passage；Described inner central tube lower end outer wall offers hand-hole, and described inner central tube is by inside isocon
When sliding axially, the hand-hole of inner central tube be able to independent with on produce and portal, lower production goes out passage connect.
Described connector, isocon, plug, upper standing valve cover composition one oil recovery passage, described outer tube, isocon,
The oil recovery passage that standing valve shunting body, lower standing valve cover composition is other；Described union joint upper end connects pump barrel, institute
Setting gradually plunger, commutation ratchet in stating pump barrel from top to bottom, described commutation ratchet lower end connects orbits controlling mechanism.
Transferring rod string, plunger drives commutation ratchet to move downward, and promotes commutation track and inner central tube to be moved downwardly to
Bottom dead centre, the double bottom dead centre transferred to is in two different low spots, above carries sucker rod to original position, now changes
Moving upward under the promotion of spring to track and inner central tube, commutation track realizes under the effect of change and track pin
Commutation, is in two different high point, thus ensures that inner central tube connects with another production bore on connector, it is achieved
Change layer to produce.
Compared to prior art, the method have the advantages that
Roofbolt controls payzone recognition methods with two set standing valve systems, it is achieved that a set of on-off control two produces layer, can
With by sucker rod directly to commutation track transfer reinforcing change layer produce, thus substantially increase oil well pump change layer produce one-tenth
Power, has a following significantly advantage:
1, sucker rod touches pump provides dynamic Control to change layer, uses mechanical track commutation, and mechanism is simple and reliable；
When 2, touching pump, polished rod is in two different low spots, can ground visible identification, easily identify that layer situation of changing and down-hole are raw
Payzone position；
3, two set standing valve systems of design are separate, and the most corresponding two differences produce layer position, simplify construction pipe
Rod structure；
4, conventional pump barrel, plunger and base are used, dependable performance, pump barrel and bottom interchangeable layer standing valve split design,
It is readily transported and field operation, and adapts to different pump footpath；
5, devise lock claw power-assisted rebounding mechanism, improve further and change a layer reliability.
Accompanying drawing explanation
Fig. 1 is that roofbolt of the present invention controls payzone recognition methods structural representation；
Fig. 2 is commutation track structure schematic diagram in pump of the present invention；
Fig. 3 is commutation track expanded view；
Fig. 4 is commutation pawl structures schematic diagram in double standing valve oil well pump of the present invention.
In figure: sucker rod 1, oil pipe 2, pump barrel 3, plunger 4, commutation ratchet 5, union joint 6, commutation track 7, turn
Ring 8, track pin 9, inner central tube 10, spring 11, spring housing 12, connector 13, outer tube 14, isocon 15,
Plug 16, upper standing valve cover 17, standing valve shunting body 18, lower standing valve cover 19, lower contact 20.
Detailed description of the invention
Detailed description for the present invention and technology contents, coordinate accompanying drawing to be described as follows, but accompanying drawing only provides reference and says
Bright it is used, is not used for the present invention is any limitation as.
Referring to the drawings 1-4, a kind of roofbolt controls payzone recognition methods, including pump barrel and be successively set on pump from top to bottom
Cylinder the orbits controlling mechanism of bottom, flow-dividing control mechanism, upper standing valve production system, fixed valve produces system
Being provided with lower standing valve production system outside system, described flow-dividing control mechanism can be distinguished by the control of orbits controlling mechanism
Connect with upper standing valve production system, lower standing valve production system.Described pump barrel lower end is connected with union joint 6, pump
Cylinder inside is by the plunger 4 set gradually from top to bottom and commutation ratchet 5；Described flow-dividing control mechanism includes inner central tube 10
With the spring 11 being enclosed within inner central tube, on the shoulder outside described spring upper end fore-set inner central tube upper end, lower end is then pushed up
On connector upper surface, the outside of spring is spring housing 12, and it is internal that described orbits controlling mechanism is positioned at union joint 6.
Described orbits controlling mechanism includes commutate track 7, change 8, track pin 9, in described commutation track lower end withstands on
On central canal 10, commutation track lower end outside is provided with change 8 and is equipped with the track pin 9 of location.
Fixed valve production system includes isocon 15, upper standing valve cover 17, at the bottom of the internal layer of described isocon
Portion arranges plug 16, and outer bottom then connects upper standing valve cover, and described isocon internal layer upper end is offered and produced out
Hole；Described lower standing valve production system includes interconnective standing valve shunting body 18, lower standing valve cover 19, described
Standing valve shunting body upper end is connected with outer tube, connects lower contact 20, described isocon upper end bottom described lower standing valve cover
And form lower production between connector and passage；Described inner central tube lower end outer wall offers hand-hole, and described inner central tube leads to
Cross when sliding axially inside isocon, the hand-hole of inner central tube be able to independent with on produce and portal, in lower production
Go out passage to connect.Described connector, isocon, plug, upper standing valve cover one oil recovery passage of composition, described
The oil recovery passage that outer tube, isocon, standing valve shunting body, lower standing valve cover composition is other.
Described union joint 6 upper end connects pump barrel 3, and lower end connects spring housing 12, sets gradually from top to bottom in described pump barrel
Plunger 4 and commutation ratchet 5, described commutation ratchet lower end connects orbits controlling mechanism.
The layer that changes that the present invention provides power to realize oil well pump by transferring sucker rod to touch pump produces.When changing layer, sucker rod is transferred,
Changing layer ratchet after touching pump and promote the commutation descending commutation of track, when can pass through to touch pump for twice at the scene, the residue length of polished rod is not
With the most directly judging the condition of commutation of down-hole switch, substantially increase switch changes a layer reliability, it is to avoid because of other factors
And the possibility of layer cannot be changed.Specific works principle is as follows:
Operation principle: inner central tube 10 is by the upper top power of spring 11 and the most active under the most downward External Force Acting
Make；On connector 13+ isocon 15+ plug 16+, standing valve cover 17 forms an oil recovery passage, outer tube 14+ isocon
Under 15+ standing valve shunting body 18+, standing valve cover 19 forms an other oil recovery passage, this technique can meet respectively from
Standing valve shunting body 18 and 20 two kinds of feed liquor oil production methods of lower contact.When going into the well, need to regulate feed pathway according to oil reservoir
Original state, oil pipe 2 is connected with pump barrel 3, under put in place after directly can seek product by turn on pump.Produce a period of time needs to change
When layer recovers the oil, can transfer rod string 1, plunger 4 drives commutation ratchet 5 to move downward, promote commutation track 7 and interior in
Heart pipe 10 continues to move downward, and when moving to after bottom dead center, above carries polished rod to original position, now commutation track 7 and interior in
Heart pipe 10 moves upward under the promotion of spring 11, and commutation track 7 realizes under the effect of change 8 and track pin 9
Commutation, the track on commutation track is that the short long orbital spacing of continuous print is arranged, and is equivalent to two gears, and commutation ratchet pressure is changed
To track, commutation track pressure inner central tube, discharge pressure after being pressed onto the end, when spring drives return, by commutation track
The location respectively of two gears, thus ensure that inner central tube 10 connects with another production bore on connector 13, it is achieved
Change layer to produce.
Roofbolt controls payzone recognition methods and is adopted pipe by group compositions such as the interchangeable layer supporting packers of standing valve under pump barrel, plunger and pump
Post, utilizes sucker rod, plunger to transfer power when touching pump afterburning to commutation track, is realized two by change and track pin
The commutation dividing producing horizon produces.Tubing string produces down to turn on pump after design attitude, when needs change layer produce time, transfer sucker rod
Post, oil well pump is with two set standing valve systems, and often set standing valve corresponding a set of productive series respectively, the most permissible
The residue length of the polished rod different condition of commutation directly judging down-hole switch when touching pump by twice, thus it is greatly improved oil pumping
The practicality of pump and change a layer reliability.
The foregoing is only presently preferred embodiments of the present invention, be not used to limit the scope of the claims of the present invention, other use this
The equivalence change of bright patent spirit, all should all belong to the scope of the claims of the present invention.
Claims (5)
1. a roofbolt controls payzone recognition methods, it is characterized in that, with packer, upper and lower two-layer is separated under oil well pump, in formation, lower two payzones, in utilization, in lower standing valve production system correspondence respectively, lower two payzones, the wherein one layer of production of initial stage correspondence, when changing layer production, transfer sucker rod, drive plunger under the action of the spring, commutation ratchet is descending, lower pressure commutation orbits controlling mechanism, it is in two different low spots, commutation orbits controlling mechanism drives flow-dividing control mechanism indirect type to be in two different high point, described flow-dividing control mechanism by the control of orbits controlling mechanism can respectively with upper standing valve production system, lower standing valve production system connects, thus the residue length difference of sucker rod directly judges the condition of commutation of down-hole switch on the ground when realizing touching pump by twice.
nullA kind of roofbolt the most according to claim 1 controls payzone recognition methods，It is characterized in that，Described orbits controlling mechanism、Flow-dividing control mechanism、Upper standing valve production system is successively set on pump barrel bottom from top to bottom，Lower standing valve production system pump barrel it is provided with by the union joint being sequentially connected with from top to bottom outside fixed valve production system、Spring housing、Connector、Outer tube，Described flow-dividing control mechanism includes inner central tube and the spring being enclosed within inner central tube，On shoulder outside described spring upper end fore-set inner central tube upper end，Lower end then withstands on connector upper surface，The outside of spring is spring housing，Described orbits controlling mechanism is positioned at inside union joint，Described orbits controlling mechanism includes the track that commutates、Change、Track pin，Described commutation track lower end withstands on inner central tube，Commutation track lower end outside is provided with change and is equipped with the track pin of location.
A kind of roofbolt the most according to claim 2 controls payzone recognition methods, it is characterized in that, fixed valve production system includes isocon, upper standing valve cover, bottom the internal layer of described isocon, plug is set, outer bottom then connects upper standing valve cover, and described isocon internal layer upper end is offered to produce and portalled；Described lower standing valve production system includes interconnective standing valve shunting body, lower standing valve cover, described standing valve shunting body upper end is connected with outer tube, connect lower contact bottom described lower standing valve cover, form lower production between described isocon upper end and connector and passage；Described inner central tube lower end outer wall offers hand-hole, when described inner central tube is by sliding axially inside isocon, the hand-hole of inner central tube be able to independent with on produce and portal, lower production goes out passage connect.
A kind of roofbolt the most according to claim 3 controls payzone recognition methods, it is characterized in that, described connector, isocon, plug, upper standing valve cover one oil recovery passage of composition, the oil recovery passage that described outer tube, isocon, standing valve shunting body, lower standing valve cover composition is other；Described union joint upper end connects tubing pump, sets gradually plunger, commutation ratchet in described tubing pump from top to bottom, and described commutation ratchet lower end connects orbits controlling mechanism.
A kind of roofbolt the most according to claim 4 controls payzone recognition methods, it is characterized in that, transfer rod string, plunger drives commutation ratchet to move downward, commutation track and inner central tube is promoted to continue to move downward, when moving to after bottom dead center, on carry sucker rod to original position, now commutation track and inner central tube move upward under the promotion of spring, commutation track realizes commutation under the effect of change and track pin, thus ensure that inner central tube connects with another production bore on connector, it is achieved change layer and produce.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510164295.0A CN106150447A (en) | 2015-04-09 | 2015-04-09 | A kind of roofbolt controls payzone recognition methods |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510164295.0A CN106150447A (en) | 2015-04-09 | 2015-04-09 | A kind of roofbolt controls payzone recognition methods |
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| CN106150447A true CN106150447A (en) | 2016-11-23 |
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| CN201510164295.0A Pending CN106150447A (en) | 2015-04-09 | 2015-04-09 | A kind of roofbolt controls payzone recognition methods |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108825168A (en) * | 2018-08-08 | 2018-11-16 | 东营市昌瑞石油机械配件有限责任公司 | A kind of liquid flow control valve |
| CN109025918A (en) * | 2018-09-16 | 2018-12-18 | 东营市汇诚石油工程技术有限责任公司 | Fixed tubular column changes a layer pumping means |
| CN109339738A (en) * | 2018-11-23 | 2019-02-15 | 东营市昌瑞石油机械配件有限责任公司 | It is hydraulic to change layer track switch |
| CN109469450A (en) * | 2017-09-07 | 2019-03-15 | 中国石油化工股份有限公司 | Sucker rod control selective oil extraction device and method |
| CN115263254A (en) * | 2022-08-15 | 2022-11-01 | 陈彦洪 | Articulated ratchet flow-adjustable layered oil pumping device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101906948A (en) * | 2010-07-29 | 2010-12-08 | 马宝忠 | Layer mining converter of defueling pump |
| CN104213884A (en) * | 2013-06-05 | 2014-12-17 | 中国石油天然气股份有限公司 | Rod-control type reservoir changing switch of pumping well and reservoir changing oil production method thereof |
| CN204493149U (en) * | 2014-12-23 | 2015-07-22 | 中国石油化工股份有限公司 | A kind of sucker rod controls interchangeable layer oil extraction pump |
-
2015
- 2015-04-09 CN CN201510164295.0A patent/CN106150447A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101906948A (en) * | 2010-07-29 | 2010-12-08 | 马宝忠 | Layer mining converter of defueling pump |
| CN104213884A (en) * | 2013-06-05 | 2014-12-17 | 中国石油天然气股份有限公司 | Rod-control type reservoir changing switch of pumping well and reservoir changing oil production method thereof |
| CN204493149U (en) * | 2014-12-23 | 2015-07-22 | 中国石油化工股份有限公司 | A kind of sucker rod controls interchangeable layer oil extraction pump |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109469450A (en) * | 2017-09-07 | 2019-03-15 | 中国石油化工股份有限公司 | Sucker rod control selective oil extraction device and method |
| CN109469450B (en) * | 2017-09-07 | 2022-05-13 | 中国石油化工股份有限公司 | Sucker rod control selective oil extraction device and method |
| CN108825168A (en) * | 2018-08-08 | 2018-11-16 | 东营市昌瑞石油机械配件有限责任公司 | A kind of liquid flow control valve |
| CN109025918A (en) * | 2018-09-16 | 2018-12-18 | 东营市汇诚石油工程技术有限责任公司 | Fixed tubular column changes a layer pumping means |
| CN109025918B (en) * | 2018-09-16 | 2024-04-05 | 东营市汇诚石油工程技术有限责任公司 | Layer-changing pumping device for stationary pipe column |
| CN109339738A (en) * | 2018-11-23 | 2019-02-15 | 东营市昌瑞石油机械配件有限责任公司 | It is hydraulic to change layer track switch |
| CN115263254A (en) * | 2022-08-15 | 2022-11-01 | 陈彦洪 | Articulated ratchet flow-adjustable layered oil pumping device |
| CN115263254B (en) * | 2022-08-15 | 2023-07-14 | 陈彦洪 | Articulated ratchet flow adjustable layering oil pumping device |
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Application publication date: 20161123 |
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