CN203362055U - Duplex metal composite casing string of oil-gas well - Google Patents
Duplex metal composite casing string of oil-gas well Download PDFInfo
- Publication number
- CN203362055U CN203362055U CN 201320401571 CN201320401571U CN203362055U CN 203362055 U CN203362055 U CN 203362055U CN 201320401571 CN201320401571 CN 201320401571 CN 201320401571 U CN201320401571 U CN 201320401571U CN 203362055 U CN203362055 U CN 203362055U
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- tubing string
- oil
- string
- gas well
- internal layer
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Abstract
Provided is a duplex metal composite casing string of an oil-gas well. Outer pipe strings are arranged outside inner pipe strings, each outer pipe string is connected with one adjacent outer pipe string through an outer pipe coupling, and each inner pipe string is formed by connecting at least 2 lining pipes through threads; each outer pipe string is formed by connecting at least 2 outer pipes through threads, 1-5 rubber sleeves are arranged between the lining pipes on the end portions of the inner pipe strings and the outer pipes on the end portions of the outer pipe strings, the length of each rubber sleeve ranges from 30mm to 200mm, and the thickness of each rubber sleeve ranges from 2mm to 7mm. The duplex metal composite casing string overcomes the defect that anti-corrosion measures of a conventional casing are insufficient, and is high in pipe string strength, strong in anti-corrosion capability, easy to implement, strong in reliability, capable of allowing the lining pipes to be replaced, good in economical efficiency, and capable of being popularized and used in oil fields.
Description
Technical field
The utility model belongs to Oil/gas Well building equipment technical field, is specifically related to a kind of Oil/gas Well bimetallic tapered casing string.
Background technology
Before oil and gas well drilling, at first to determine the drilling well well location on ground, then, accomplish fluently the basis of rigging up at the well location place and derrick and rig are installed.During drillng operation, rely on the power of rig to drive drilling rod and bit, the drill bit rock stratum that successively fragmentation downwards runs into, and form a well.The size of well-drilling borehole size is decided by drill bit size.Drill bit is in broken rock, and by hollow drilling rod, to underground injection drilling fluid, a large amount of landwaste that drill bit is produced at broken formation take ground to by the drilling fluid of circulation.The solidifying and controlling device on ground is squeezed into drilling fluid in well again by borehole pump after the landwaste in drilling fluid is removed.Drilling fluid is to arrive the bit port place through drill pipe bore, then returns and flow to ground from the annular space of the borehole wall and drill string.The process of creeping into is that drill bit fractured rock and drilling fluid are by the process that circulates and constantly carry out drilling cuttings and form pit shaft.
After brill reaches projected depth, to in pit shaft, be lowered to instrumentation and carry out logging operation, purpose is to determine the position of down-hole formation lithology and each oil, gas, water layer, and then be lowered to the sleeve pipe that is less than well-drilling borehole, and injected water mud is fixed on sleeve pipe on the borehole wall in the annular space of sleeve pipe and the borehole wall.Last procedure is that the sleeve pipe to the oil reservoir position carries out perforation, forms artificially a downhole oil gas and flows into the duct in sleeve pipe.
The strata pressure Gao Shike of oil gas flows out ground voluntarily, and this well is called the self-spraying oil-gas well.Oil-air pressure need aspirate from down-hole by external force when low, and this well is called nonflowing well.
Often contain corrosive medium in the Oil/gas Well produced fluid, can cause corrosion to production casing, in serious situation, this corrosion can make sleeve pipe lose its function, causes well normally to produce.So, must taking the initiative property casing tube anti-corrosive erosion measure for the well of seriously corroded.At present, from the measure of sleeve pipe self-preserving, known anti-corrosion method mainly contains: (1) corrosion-resistant metal materials sleeve pipe, utilize corrosion-resistant metal materials to manufacture sleeve pipe, the price of this corrosion-resistant metal materials sleeve pipe, far above ordinary carbon steel or low-alloy steel sleeve pipe, can make the shaft building cost greatly increase; (2) composite bimetal pipe, used composite bimetal pipe adopts the method for welding to be connected, and its welding difficulty is very large, and welding quality is difficult to control, and has larger danger in the welding of Oil/gas Well well head.
Summary of the invention
Technical problem to be solved in the utility model is to overcome the deficiency of above-mentioned existing casing tube anti-corrosive erosion measure, provide that a kind of tube column strength is high, corrosion resistance is strong, it is simple to implement, reliability is strong, internal lining pipe is replaceable, the Oil/gas Well bimetallic tapered casing string of good economy performance.
Solving the problems of the technologies described above adopted technical scheme is: in internal layer tubing string outer setting, outer tubing string is arranged, an outer tubing string connects with the outer tube box cupling with an adjacent outer tubing string, and the internal layer tubing string at least consists of by thread connection 2 internal lining pipes.Outer tubing string of the present utility model at least consists of by thread connection 2 outer tubes, between the internal lining pipe of internal layer tubing string and outer tube column end and outer tube, is provided with 1～5 rubber bush.
Rubber bush length of the present utility model is that 30～200mm, thickness are 2～7mm.
Because adopting internal lining pipe, the utility model internal layer tubing string is threaded connection, outer tubing string adopts outer tube to pass through thread connection, be provided with rubber bush between the internal lining pipe of internal layer tubing string and outer tube column end and outer tube, the Oil/gas Well bimetallic tapered casing string of this structure, have that intensity is high, corrosion resistance is strong, implement simple, the advantages such as reliability is strong, internal lining pipe is replaceable, good economy performance, can on oil field, promote the use of.
The accompanying drawing explanation
Fig. 1 is the structural representation of an embodiment of the utility model.
The specific embodiment
Below in conjunction with drawings and Examples, the utility model is further described, but the utility model is not limited to these embodiment.
Embodiment 1
In Fig. 1, the Oil/gas Well bimetallic tapered casing string of the present embodiment is connected and is formed by outer tubing string 1, rubber bush 2, internal layer tubing string 3, outer tube box cupling 4.
The internal layer tubing string 3 of the present embodiment consists of 3 internal lining pipes, is processed with internal thread at an end of every internal lining pipe, the other end is processed with external screw thread, and adjacent two internal lining pipes pass through thread connection.The concrete quantity of internal lining pipe should specifically be determined according to the length of internal layer tubing string 3.
The outer tubing string 1 of the present embodiment consists of 3 outer tubes, an end at every outer tube is processed with internal thread, the other end is processed with external screw thread, adjacent two outer tubes pass through thread connection, the outside of two outer tube connection places is equipped with outer tube box cupling 4 by thread connection, also can connect without outer tube box cupling 4.The concrete quantity of outer tube should specifically be determined according to the length of outer tubing string 1, can determine the concrete length of internal layer tubing string 3 and outer tubing string 1 according to the degree of depth of oil well.
2 rubber bushs 2 are installed between the internal lining pipe of internal layer tubing string 3 and outer tubing string 1 end and outer tube, and rubber bush 2 is long is that 120mm, thickness are 5mm.
The utility model carries out hole enlargement to internal layer tubing string 3 after going into the well and installing in well, be arranged between the inner surface of rubber bush 2 on internal layer tubing string 3 two ends external surfaces and outer tubing string 1 and contact compression, rubber bush 2 makes to combine closely between internal layer tubing string 3 and outer tubing string 1 by compressing the frictional force produced.The utility model internal layer tubing string 3 after long-term production is used is corroded or during impaired need to again the replacing, can make rubber bush 2 at high temperature melt to remove between internal layer tubing string 3 and outer tubing string 1 contact compression after internal layer tubing string 3 is changed.
Embodiment 2
The rubber bush 2 that 1 the long 200mm of being, thickness are 7mm is installed between the internal lining pipe of the internal layer tubing string 3 of the present embodiment and outer tubing string 1 end and outer tube.The connecting relation of other component and component is identical with embodiment 1.
Embodiment 3
It is the rubber bush 2 that 30mm, thickness are 2mm that 5 length that are arranged in parallel are installed between the internal lining pipe of the internal layer tubing string 3 of the present embodiment and outer tubing string 1 end and outer tube.The connecting relation of other component and component is identical with embodiment 1.
Embodiment 4
In above embodiment 1-3, internal layer tubing string 3 consists of 2 internal lining pipes, is processed with internal thread at an end of every internal lining pipe, the other end is processed with external screw thread, and 2 internal lining pipes pass through thread connection.
Outer tubing string 1 consists of 2 outer tubes, is processed with internal thread at an end of every outer tube, the other end is processed with external screw thread, and 2 outer tubes are by thread connection, and the outside of 2 outer tube connection places is equipped with outer tube box cupling 4 by thread connection.The connecting relation of other component and component is identical with corresponding embodiment.
Embodiment 5
In above embodiment 1-3, internal layer tubing string 3 consists of 20 internal lining pipes, is processed with internal thread at an end of every internal lining pipe, the other end is processed with external screw thread, and adjacent 2 internal lining pipes pass through thread connection.
Outer tubing string 1 consists of 20 outer tubes, is processed with internal thread at an end of every outer tube, the other end is processed with external screw thread, and adjacent 2 outer tubes are by thread connection, and the outside of adjacent 2 outer tube connection places is equipped with outer tube box cupling 4 by thread connection.The connecting relation of other component and component is identical with corresponding embodiment.
According to above-mentioned principle, can also design the Oil/gas Well bimetallic tapered casing string of another concrete structure, but all within protection domain of the present utility model.
Claims (2)
1. an Oil/gas Well bimetallic tapered casing string, in internal layer tubing string (3) outer setting, outer tubing string (1) is arranged, an outer tubing string (1) connects with outer tube box cupling (4) with an adjacent outer tubing string (1), it is characterized in that: described internal layer tubing string (3) at least consists of by thread connection 2 internal lining pipes; Described outer tubing string (1) at least consists of by thread connection 2 outer tubes, between the internal lining pipe of internal layer tubing string (3) and outer tubing string (1) end and outer tube, is provided with 1～5 rubber bush (2).
2. Oil/gas Well bimetallic tapered casing string according to claim 1, it is characterized in that: the length of described rubber bush (2) is that 30～200mm, thickness are 2～7mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320401571 CN203362055U (en) | 2013-07-05 | 2013-07-05 | Duplex metal composite casing string of oil-gas well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320401571 CN203362055U (en) | 2013-07-05 | 2013-07-05 | Duplex metal composite casing string of oil-gas well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203362055U true CN203362055U (en) | 2013-12-25 |
Family
ID=49809841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320401571 Expired - Fee Related CN203362055U (en) | 2013-07-05 | 2013-07-05 | Duplex metal composite casing string of oil-gas well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203362055U (en) |
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2013
- 2013-07-05 CN CN 201320401571 patent/CN203362055U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131225 Termination date: 20140705 |
|
| EXPY | Termination of patent right or utility model |