CN201152152Y - Casing string compression stress releasing coupling - Google Patents
Casing string compression stress releasing coupling Download PDFInfo
- Publication number
- CN201152152Y CN201152152Y CNU2007201904418U CN200720190441U CN201152152Y CN 201152152 Y CN201152152 Y CN 201152152Y CN U2007201904418 U CNU2007201904418 U CN U2007201904418U CN 200720190441 U CN200720190441 U CN 200720190441U CN 201152152 Y CN201152152 Y CN 201152152Y
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- casing string
- millimeters
- ripple
- casing
- screw thread
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Abstract
The utility model provides a casing string compressive stress releasing collar which is applied to a case pipe string in the petroleum well. The collar is characterized in that the collar comprises a screw thread section and a ripple section. The screw thread sections are arranged at two ends of the ripple section. The screw thread sections at two ends are provided with an inner screw thread. The inner screw thread is manufactured according to the API inner screw thread standard. The ripple section is arranged between the junctions of the API inner screw thread at two ends of the casing string compressive stress releasing collar. The ripple amount of the ripple section is between 3 and 15 and the thickness of the ripple section is between 6 millimeters and 24 millimeters. The ripple comprises a wave crest and a wave hollow. The pitch of wave of the ripple is between 12 millimeters and 48 millimeters. The circle radiuses of the wave crest and the wave hollow are between 3 millimeters and 12 millimeters. The wave amplitude height is between 8 millimeters and 12 millimeters. The casing string compressive stress releasing collar has the effects that the bending deformation caused after the casing string in the well is compressed is overcome; the service lift of the casing string in the petroleum well is improved; the single function of casing connection of the traditional casing collar is overcome. The bending deformation caused after the casing string in the well is compressed cannot be counteracted by the string connected by traditional casing collar.
Description
Technical field:
The utility model relates to the OCTG technical field, particularly a kind of casing coupling.Be a kind of compressible casing coupling that prevents down-hole string compression bending deformation specifically.
Background technology:
Oil well setting of casing tubing string is the central core of circulation of oil recovery, gas production.After finishing drilling well, adopt cementing method that the down-hole casing tubing string and the borehole wall are fixed together.The integrality of oil well lower tubular column directly influences the life-span of oil gas well.
The reservoir section of oil gas well mostly is sandstone.The oil recovery stage after the perforation formation testing, the reservoir section casing string of oil gas well causes the axial compression load effect that the reservoir compacting forms owing to being subjected to shaking out, bending deformation very easily takes place, cause the down-hole oil production instrument to be blocked or the obstruction of oil gas runner, make the oil gas well can't ordinary production, cause the oil gas well to be scrapped when serious.For example, Xinjiang Oilfield south edge block geological condition is high steep structure in front of the mountains, and reservoir section lithology is a sandstone, the very fast in a short time vanishing of oil after the perforation formation testing.Well logging shows that serious bending deformation takes place reservoir section sleeve pipe tubing string, causes the formation testing road to stop up.Workover treatment takes time and effort, and causes the work of exploration and development of this block to be made slow progress, and has directly influenced the oil-gas field development progress, has had a strong impact on the economic benefit in oil field.
In addition, in thermal production well, drive viscous crude production owing to adopt high-temperature steam to inject, down-hole casing tubing string expanded by heating makes the sleeve pipe tubing string bear repeatedly compressive load.Steam injects and to make the sleeve pipe swollen account that is heated, the constraint of cementing concrete on every side, and the sleeve pipe tubing string bears compressive load.The sleeve pipe tubing string bears compressive load repeatedly for a long time, produces the accumulating plastic deformation, and the structural integrity of sleeve pipe tubing string is destroyed, and serious bending deformation takes place tubing string.For example, the Liaohe Oil Field is typical thick oil thermal extraction operation area.Because thermal recovery operation, casing string bending deformation account for cover and decrease more than 79% of total well number, had a strong impact on the economic benefit in oil field.
At the problem of above-mentioned operating mode sleeve pipe tubing string generation bending deformation, need to adopt a kind of not only reliable but also economical and practical preventive action.
The utility model content:
Main purpose of the present utility model is: provide a kind of casing string compressive stress to discharge box cupling, adopting bellows is the box cupling form of interlude, offsets, overcomes the bending deformation problem of down-hole casing tubing string back generation by compression.Use the casing string compressive stress to discharge the sleeve pipe tubing string that box cupling connects, the application life that can improve oil well setting of casing tubing string.
The technical solution of the utility model is: the casing string compressive stress discharges box cupling and comprises: thread segment and bellows segment, and the two ends of bellows segment are thread segments, and the thread segment at two ends has internal thread, and internal thread adopts the processing of API internal thread standard, can be connected with the sleeve pipe of API standard.The casing string compressive stress has bellows segment in the middle of discharging box cupling ends A PI female adapter.Bellows segment is according to the processing of actual condition sleeve pipe tubing string deformation requirements, and the ripple quantity of bellows segment according to the casing string decrement requirement of actual condition, is determined wave number between 3-15.The thickness of bellows segment is determined according to the actual nominal wall thickness of sleeve pipe of selecting for use between the 6-24 millimeter.Ripple comprises crest and trough, and outside projection is a crest on the casing string compressive stress release box cupling outer wall; The casing string compressive stress discharges the part that caves inward on the box cupling outer wall and is trough, and the distance between two crests of fellow villagers is the pitch of waves.The pitch of waves length of ripple is between the 12-48 millimeter, is actual about 2 times of selecting the sleeve pipe nominal wall thickness for use.The radius of crest and trough tangent arc is between the 3-12 millimeter, is actual 1/2 of the sleeve pipe nominal wall thickness of selecting for use.The wave amplitude height is between the 8-10 millimeter, and wave amplitude is the degree of depth of trough.
The bellows segment of casing string compressive stress release box cupling is different from the bellows of common meaning.The bellows wall thickness of common meaning is only between the 0.2-0.5 millimeter, and the thickness of the utility model bellows segment is about 30 times of bellows wall thickness of common meaning; Range of application difference, the bellows of common meaning generally are applied on the instrument, and the utility model is applied to oil well setting of casing box cupling; Act on differently with principle, cold contraction is met in the elongation of the bellows expanded by heating of common meaning; The utility model bellows segment is when sleeve pipe tubing string expanded by heating compresses, and offsets, overcomes the bending deformation of down-hole casing tubing string back generation by compression.
The beneficial effects of the utility model are: the casing string compressive stress discharges box cupling, adopt compressive stress delivery mode on the structure with corrugated form, changed being rigidly connected of existing API standard box cupling, the connected mode of oil layer section casing string is become flexibly connect, to overcome the casing string bending deformation that axial compression load causes.Can offset, overcome the bending deformation of down-hole casing tubing string back generation by compression, use the casing string compressive stress to discharge the sleeve pipe tubing string that box cupling connects, the application life that can improve oil well setting of casing tubing string.Improved the integrality of tubular column structure.It is simple in structure that the casing string compressive stress discharges box cupling, on-the-spot easy to use, do not need the special special requirement that go up button instrument and moment of torsion, can not have specific (special) requirements by the requirement operation of button program and moment of torsion on the API casing threads fully.
Casing string compressive stress of the present utility model discharges the box cupling structure bigger improvement, and the casing coupling function singleness that breaks traditions only can play the splicing sleeve effect; The bending deformation of down-hole casing tubing string back generation by compression can not be offset, be overcome to the sleeve pipe tubing string that uses the traditional sleeve box cupling to connect.
Description of drawings
Fig. 1 is that the utility model casing string compressive stress discharges box cupling structural profile schematic diagram.It is the structural representation of embodiment 1.
Among the figure, 1. thread segment, 2. bellows segment, 3. crest, 4. trough.
The specific embodiment:
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Embodiment 1: the casing string compressive stress release box cupling with 139.70 * 10.54mm grade of steel P110 buttress thread BC is an example, describes.
Consult Fig. 1.The casing string compressive stress discharges box cupling and comprises thread segment 1 and bellows segment 2, and the two ends of bellows segment 2 are thread segments 1, and the thread segment 1 at two ends has internal thread, and internal thread adopts the inclined to one side trapezoidal internal thread standard of API to process.The casing string compressive stress has bellows segment 2 in the middle of discharging box cupling ends A PI female adapter.3 of the ripple quantity of bellows segment 2,10.54 millimeters of the thickness of bellows segment 2.Ripple comprises crest 3 and trough 4.The pitch of waves length of ripple is 21.08 millimeters.The arc radius of crest 3 and trough 4 is 5.27 millimeters.The wave amplitude height is 9 millimeters.
The utility model casing string compressive stress discharges the concrete size design of box cupling, is the requirement according to concrete operating mode tubing string compress variation, and selected casing string is determined Telescopic short piece quantity and design the casing string compressive stress to discharge box cupling ripple quantity, processing then.After determining wave number, according to the selected API standard thread joint length of sleeve pipe specification, determine pipe nipple length, at first process bellows segment inner surface ripple, the internal thread of machining screw section is then processed the ripple of bellows segment outside at last.The steel that processing casing string compressive stress discharges the box cupling use are identical with the grade of steel of sleeve pipe body.During last button, the interior threaded surface of two ends thread segment is evenly smeared thread compound.Adopt the specialized barrel clamp to hold the rotation of thread segment external surface.According to detaining on the API screw thread button-type employing API peak torque.Also can directly and on the sleeve pipe body male end detain in the production field.
Claims (1)
1, a kind of casing string compressive stress discharges box cupling, comprise thread segment (1) and bellows segment (2), the two ends of bellows segment (2) are thread segment (1), the thread segment at two ends (1) has internal thread, internal thread adopts API internal thread standard to be processed into, it is characterized in that: the casing string compressive stress has bellows segment (2) in the middle of discharging box cupling ends A PI female adapter, the ripple quantity of bellows segment (2) is between 3-15, the thickness of bellows segment (2) is between the 6-24 millimeter, ripple comprises crest (3) and trough (4), the pitch of waves length of ripple is between the 12-48 millimeter, and the arc radius of crest (3) and trough (4) is between the 3-12 millimeter, and the wave amplitude height is between the 8-10 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201904418U CN201152152Y (en) | 2007-11-29 | 2007-11-29 | Casing string compression stress releasing coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201904418U CN201152152Y (en) | 2007-11-29 | 2007-11-29 | Casing string compression stress releasing coupling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201152152Y true CN201152152Y (en) | 2008-11-19 |
Family
ID=40127831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201904418U Expired - Lifetime CN201152152Y (en) | 2007-11-29 | 2007-11-29 | Casing string compression stress releasing coupling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201152152Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113356816A (en) * | 2021-07-15 | 2021-09-07 | 西安努柏石油科技有限公司 | Method and device for releasing thermal stress of completion pipe string of thickened oil thermal production well and casing string |
| CN113404444A (en) * | 2020-03-16 | 2021-09-17 | 中国石油天然气集团有限公司 | Flexible nipple for relieving deformation of oil casing of oil-gas well |
-
2007
- 2007-11-29 CN CNU2007201904418U patent/CN201152152Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404444A (en) * | 2020-03-16 | 2021-09-17 | 中国石油天然气集团有限公司 | Flexible nipple for relieving deformation of oil casing of oil-gas well |
| CN113356816A (en) * | 2021-07-15 | 2021-09-07 | 西安努柏石油科技有限公司 | Method and device for releasing thermal stress of completion pipe string of thickened oil thermal production well and casing string |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20081119 |