CN106368630A - Method and special tool for sand flushing - Google Patents

Method and special tool for sand flushing Download PDF

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Publication number
CN106368630A
CN106368630A CN201610884425.2A CN201610884425A CN106368630A CN 106368630 A CN106368630 A CN 106368630A CN 201610884425 A CN201610884425 A CN 201610884425A CN 106368630 A CN106368630 A CN 106368630A
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CN
China
Prior art keywords
sand
tube
rotation
pipe
sand washing
Prior art date
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Granted
Application number
CN201610884425.2A
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Chinese (zh)
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CN106368630B (en
Inventor
王飞
周会刚
王江顺
王志涛
吴静
王东
宁顺康
李中华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhongyuan Oilfield Branch Oil Production No4 Plant Of China Petroleum Chemical Co Ltd
China Petroleum and Chemical Corp
Original Assignee
Zhongyuan Oilfield Branch Oil Production No4 Plant Of China Petroleum Chemical Co Ltd
China Petroleum and Chemical Corp
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Application filed by Zhongyuan Oilfield Branch Oil Production No4 Plant Of China Petroleum Chemical Co Ltd, China Petroleum and Chemical Corp filed Critical Zhongyuan Oilfield Branch Oil Production No4 Plant Of China Petroleum Chemical Co Ltd
Priority to CN201610884425.2A priority Critical patent/CN106368630B/en
Publication of CN106368630A publication Critical patent/CN106368630A/en
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Publication of CN106368630B publication Critical patent/CN106368630B/en
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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/02Surface sealing or packing
    • E21B33/03Well heads; Setting-up thereof

Abstract

The invention relates to a method and special tool for sand flushing, and belongs to the technical field of well repairing work. The method and special tool for sand flushing are suitable for sand flushing construction of a pitshaft of an oil-gas well. The special tool for sand flushing comprises an outer pipe and a sand flushing inner pipe. The outer pipe is formed by sequentially connecting an oil pipe, a suspension pup joint and a rotary outer cylinder in a threaded mode. The sand flushing inner pipe is formed by sequentially connecting a sealing pup joint, a flushing pipe, a rotary inner cylinder and a drill bit in a threaded mode. According to the method and special tool for sand flushing, the annular space between the flushing pipe and the outer pipe is sealed through the sealing pup joint, a sand flushing fluid circulating channel between the outer pipe and the sand flushing inner pipe is established, and direct-circulating and reverse-circulating sand flushing construction in the sliding state of the flushing pipe is achieved; and rotating power for matching between the outer pipe and the ground is transmitted through the rotary inner cylinder and the rotary outer cylinder, the sand flushing drill bit is driven to rotate, and thus the rotary-drilling sand flushing construction requirement under a complex well condition is met.

Description

A kind of sand washing method and specific purpose tool
Technical field
The present invention relates to a kind of sand washing method and specific purpose tool, belong to workover treatment technical field it is adaptable to oil gas water well Pit shaft construction.
Background technology
Due to formation sand production or technological measure back-up sand in oil gas water well production process, cause in pit shaft, to stockpile the burial of sand post Target zone, leads to oil well output to decline or water injection pressure raises, the normal production of impact oil-water well.Sand washing is using supporting Tubing string, instrument, equipment and swiftly flowing workover fluid, sand post in pit shaft is crushed, breaks up, and takes with returning in workover fluid circulation Take ground out of, thus removing the long-pending sand of pit shaft, recovering and improving a kind of method of oil well output or water injection rate.
Conventional construction mode is mainly taken and is rushed next single depth, stops pump truck feed flow, connect change next single, Construction can be walked under continuing, termination of pumping connect change single during, sand grains that sand cleaning fluid carries sinks, and causes sand washing efficiency to drop Low, and easily cause sand to bury sand-flushing pipe column, there is lock of tool drilling.
The little washing pipe continuous flushing sand tubular column of the patent disclosure of Application No. 201310299811.1, including little washing pipe, center Pipe, bearing assembly, impeller, sand shovel, suppress from oil pipe during construction, and liquid-driving impeller rotary blade drives sand shovel to rotate together, Realize sand setting is loosened;Seal assembly establishes the pressure reduction between oil pipe and little washing pipe, in the work of pressure reduction and little washing pipe deadweight With under, sand-flushing pipe column comes downwards to sand face along oil pipe, sand loosen after, by circulation fluid pass through oil pipe circulate take out of.Due to impeller not Sealing, leads to rotary power limited, cannot meet the rotation in harder sand face under tubing string pressurized conditions, cause sand washing no drilling depth, Sand washing efficiency reduces.
Patent No. zl200720029715.5 discloses New type continuous sand-washing equipment.This device mainly by sealed outer pipe and Sealed inner tube forms, and during use in the presence of pump pressure, goes directly shaft bottom thus forming impact to shaft bottom sand by sand washing inner tube, Return out with sand cleaning fluid.This device does not design rotary drilling structure, causes to rush because crushing for harder agglutination sand face Sand no drilling depth.
Content of the invention
The invention aims to overcoming the bit freezing risk that conventional sand washing technology exists, existing continuous sand flushing device is no Method realizes rotary drilling, the low defect of sand washing efficiency, provides a kind of safe and efficient continuous sand flushing method and specific purpose tool.
The technical scheme is that
A kind of sand washing specific purpose tool, including outer tube and sand washing inner tube, outer tube is by oil pipe, hanging pup joint and rotation outer tube successively Threaded form, by packoff nipple, washing pipe, rotation inner core and drill bit is threaded successively forms for sand washing inner tube.
The central through hole of hanging pup joint is conical seat.
Rotation outer tube is tubular structure, and lower port is guide shoe, and its central through hole is provided with least two longitudinal bar shaped driving keys.
Rotation inner core is tubular structure, and its external diameter is less than the internal diameter of the bar shaped driving key of rotation outer tube, and its outer wall is provided with At least two external diameters are more than longitudinal bar shaped transmission block key of the bar shaped driving key internal diameter rotating outer tube.
Packoff nipple is threaded successively by top connection, connecting short section, lower contact, suit opening upwards on connecting short section Leather cup type packing element, connecting short section is that at least 2 grades combinations connect, and the bottom of lower contact is corresponding with the conical seat of hanging pup joint Cone.
A kind of sand washing method, the group including sand-flushing pipe column allocates well, direct circulation sand washing, inverse circular sand washing adapter, rotary drilling punching into Sand construction procedure.
Before construction, it is sequentially connected down drill bit, rotation inner core, sand clean out pipe, packoff nipple, then set loads into outstanding successively Hang pipe nipple, rotation outer tube, oil pipe, until sand face position in pit shaft, now packoff nipple, sand clean out pipe, rotation inner core slide in succession Enter in outer tube, complete outer tube, the sand-flushing pipe column of sand washing inner tube composition.
When there is bulky grain hard sand lump in pit shaft, when sand post cement plane, sleeve pipe burr cause sand washing to be hampered, transfer outer tube Enter in rotation outer tube to rotation inner core, outer tube connects top drive apparatus, drive oil pipe and rotation outer tube rotation, the bar of rotation outer tube Shape driving key is overlapped with the bar shaped transmission block key side of rotation inner core, inner cylinder rotating being rotated, thus driving bit, breaking Bulky grain hard sand lump in broken pit shaft and sand post cement plane, milling pit shaft burr, and carry out ground with sand cleaning fluid, under continuing Put and spun outer tube, constantly deepen sand washing depth, gradually rotation sand washing is to design requirement sand washing position.
Using effect of the present invention:
The present invention utilizes packoff nipple to seal the toric space of washing pipe and outer tube, sets up the sand cleaning fluid of outer tube and sand washing inner tube Circulation canal, and realize annular space sealing under outer tube bore sliding mode for the washing pipe, meet rushing under positive and negative circulation sand washing state Sand construction requirement.
The present invention transmits the supporting rotary power in outer tube ground using rotation outer tube and rotation inner core, drives the rotation of sand washing drill bit Turn, thus the bulky grain hard sand lump in broken pit shaft and sand post cement plane, milling pit shaft burr, meet the rotation under complex hole condition Turn drilling construction to require.
The present invention, in construction, is declined with pit shaft sand cylinder in outer tube using sand washing inner tube and slides descending, from Dynamic deepen sand washing depth it is achieved that not termination of pumping, not connecing and change single continuous sand flushing construction, improve sand washing efficiency, decrease sand washing Bit freezing risk.
The present invention utilizes the supporting blowout preventer of well head and manifold apparatus, and the circulation sand washing under achievable well head air-tight state is applied Work, decreases construction environment pollution.
Brief description
Fig. 1 is continuous sand flushing structural representation of the present invention;
Fig. 2 is rotary drilling sand washing structural representation of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples the present invention is further described.
Shown in Fig. 1, Fig. 2, a kind of sand washing specific purpose tool includes outer tube and sand washing inner tube, and outer tube is by oil pipe 6, hanging pup joint 2 and rotation outer tube 3 is threaded successively forms, inner tube is by packoff nipple 1, washing pipe 5, rotation inner core 4 and drill bit 7 successively screw thread even Connect and form.
The central through hole of described hanging pup joint 2 is conical seat, and the upper and lower ends of hanging pup joint 2 are provided with connection screw thread.
Described rotation outer tube 3 is tubular structure, and lower port is guide shoe, and its central through hole is provided with least two longitudinal bar shapeds Driving key 301.
Described packoff nipple 1 is by top connection 101, connecting short section 102, lower contact 104 is threaded successively forms, and connects Cartridge 103 is set with pipe nipple 102, the bottom of lower contact 104 is the cone corresponding with the conical seat of hanging pup joint 2.
Described rotation inner core 4 is tubular structure, and its external diameter is less than the internal diameter of the bar shaped driving key 301 of rotation outer tube 3, its Outer wall is provided with longitudinal bar shaped transmission block key 401 that at least two external diameters are more than bar shaped driving key 301 internal diameter of rotation outer tube 3.
The leather cup type packing element of opening upwards is preferably set with the connecting short section 102 of packoff nipple 1, connecting short section 102 is At least 2 grades combinations connect.
A kind of sand washing method includes following construction procedure:
1st, the group of sand-flushing pipe column allocates well into:
Before construction, it is sequentially connected down drill bit 7, rotation inner core 4, sand clean out pipe 5, packoff nipple 1, then set loads successively Enter hanging pup joint 2, rotation outer tube 3, oil pipe 6, until sand face position in pit shaft, now packoff nipple 1, sand clean out pipe 5, rotation inner core 4 slip in outer tube in succession, complete outer tube, the sand-flushing pipe column of sand washing inner tube composition.
2nd, direct circulation sand washing:
Outer tube connects wellhead manifold and construction pump truck, and outer tube is just suppressed, and sand cleaning fluid flows through short to sealing along oil pipe 6 inner chamber Section 1, the now leather cup type packing element forced expansion of packoff nipple 1 suit, the annular space of sealing Sealing 1 and oil pipe 6 inwall, Set up the direct circulation passage that outer tube is linked up with sand washing inner tube, sand cleaning fluid flows through packoff nipple 1, sand clean out pipe 5, rotation inner core 4 and bores 7 carry out sand washing, break up sand post in pit shaft, and carry sand grains and return to ground along along outer tube and shaft in wall annular space.Continue sand washing, Sand washing inner tube, under Gravitative Loads, declines and continuous decrease with sand face in pit shaft, not termination of pumping, does not connect and changes single continuous direct circulation punching Sand is to design requirement sand washing position.
3rd, inverse circular sand washing adapter:
Close Wellhead packer, sealed outer pipe and shaft in wall annular space, connected wellhead manifold and applied by annular space sealing position Work pump truck, opens work(sand washing pump, suppresses to the annular space between outer tube and sleeve pipe is counter, and sand cleaning fluid is along outer tube and shaft in wall annular Space comes downwards to drill bit 7, carries out sand washing, breaks up in pit shaft sand post carrying and returns on sand grains, flow through rotation inner core 4, sand clean out pipe 5, Packoff nipple 1.Now cartridge 103 forced expansion of packoff nipple 1 suit, between sealing packoff nipple 1 and oil pipe 6 inwall Annular space, set up the reacting cycle passage that outer tube and sand washing inner tube are linked up, load fluid is along along the oil pipe 6 on packoff nipple 1 top Ground is returned on chamber.Continue construction, sand washing inner tube, under Gravitative Loads, declines and continuous decrease with sand face in pit shaft, no Termination of pumping, do not connect change single continuous recoil sand to design requirement sand washing position.
4th, rotary drilling sand washing:
When there is bulky grain hard sand lump in pit shaft, when sand post cement plane, sleeve pipe burr cause sand washing to be hampered, transfer outer tube Enter in rotation outer tube 3 to rotation inner core 4, outer tube connects top drive apparatus, drive oil pipe 6 and rotation outer tube 3 to rotate, rotate outer tube 3 bar shaped driving key 301 is overlapped with bar shaped transmission block key 401 side of rotation inner core 4, inner core 4 is rotated and rotates, thus carrying Dynamic drill bit 7 rotates, the bulky grain hard sand lump in broken pit shaft and sand post cement plane, milling pit shaft burr, and takes with sand cleaning fluid Take ground out of.Persistently decentralization spun outer tube, constantly deepens sand washing depth, and gradually rotation sand washing is to design requirement sand washing position.

Claims (8)

1. a kind of sand washing specific purpose tool, including outer tube and sand washing inner tube, is characterized in that: outer tube is by oil pipe (6), hanging pup joint (2) Outer tube (3) is threaded successively to be formed with rotating, and inner tube is by packoff nipple (1), sand clean out pipe (5), rotation inner core (4) and drill bit (7) threaded successively form.
2. a kind of sand washing specific purpose tool according to claim 1, is characterized in that: the central through hole of hanging pup joint (2) is cone Shape seat.
3. a kind of sand washing specific purpose tool according to claim 1, is characterized in that: rotation outer tube (3) is tubular structure, lower end Mouth is guide shoe, and its central through hole is provided with least two longitudinal bar shaped driving keys (301).
4. a kind of sand washing specific purpose tool according to claim 3, is characterized in that: rotation inner core (4) is tubular structure, outside it Footpath is less than the internal diameter of the bar shaped driving key (301) of rotation outer tube (3), and its outer wall is provided with least two external diameters and is more than rotation outer tube (3) longitudinal bar shaped transmission block key (401) of bar shaped driving key (301) internal diameter.
5. a kind of sand washing specific purpose tool according to claim 2, is characterized in that: packoff nipple (1) by top connection (101), Connecting short section (102), lower contact (104) are threaded successively, the upper leather cup type packing element being set with opening upwards of connecting short section (102) (103), connecting short section (102) is that at least 2 grades combinations connect, and the bottom of lower contact (104) is the conical seat with hanging pup joint (2) Corresponding cone.
6. a kind of sand washing method, is characterized in that: the group including sand-flushing pipe column allocates well, direct circulation sand washing, inverse circular sand washing adapter, rotation into Drilling construction step.
7. sand washing method according to claim 6, is characterized in that: before construction, is sequentially connected down drill bit (7), rotation Turn inner core (4), sand clean out pipe (5), packoff nipple (1), then set loads into hanging pup joint (2), rotation outer tube (3), oil pipe successively (6), up to sand face position in pit shaft, now packoff nipple (1), sand clean out pipe (5), rotation inner core (4) slips into outer tube in succession Interior, complete outer tube, the sand-flushing pipe column of sand washing inner tube composition.
8. sand washing method according to claim 6, is characterized in that: when there is bulky grain hard sand lump, sand post glue in pit shaft When junction, sleeve pipe burr cause sand washing to be hampered, decentralization outer tube enters in rotation outer tube (3) to rotating inner core (4), and outer tube connects top Drive apparatus, drive oil pipe (6) and rotation outer tube (3) rotation, the bar shaped driving key (301) of rotation outer tube (3) and rotation inner core (4) Bar shaped transmission block key (401) side overlap, be rotated inner core (4) rotation, thus drive drill bit (7) rotate, broken pit shaft Interior bulky grain hard sand lump and sand post cement plane, milling pit shaft burr, and carry out ground with sand cleaning fluid, persistently transfer and revolve Turn outer tube, constantly deepen sand washing depth, gradually rotation sand washing is to design requirement sand washing position.
CN201610884425.2A 2016-10-10 2016-10-10 A kind of sand washing method and specific purpose tool Active CN106368630B (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107218003A (en) * 2017-07-18 2017-09-29 中国石油集团渤海钻探工程有限公司 Coal bed gas continuous punching sandpipe string and its sand washing method

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Publication number Priority date Publication date Assignee Title
CN107218003A (en) * 2017-07-18 2017-09-29 中国石油集团渤海钻探工程有限公司 Coal bed gas continuous punching sandpipe string and its sand washing method

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