CN104975813A - Oil well pipe - Google Patents
Oil well pipe Download PDFInfo
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- CN104975813A CN104975813A CN201510320509.9A CN201510320509A CN104975813A CN 104975813 A CN104975813 A CN 104975813A CN 201510320509 A CN201510320509 A CN 201510320509A CN 104975813 A CN104975813 A CN 104975813A
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Abstract
The invention provides an oil well pipe, which comprises an oil well pipe body, wherein the two ends of the oil well pipe body are provided with thickening belts; a transition belt is arranged between the oil well pipe body and each thickening belt; and the length of the transition belt is 80mm. The ultralong transition belt is used, so that the stress concentration can be effectively avoided, and the fatigue-resistant performance of the oil well pipe is improved. The transition belt is in smooth curved transition. The curvature radius can be set to be the more proper curvature radius under the condition of the ultralong transition belt. Through the measures, the stress concentration is further avoided, and the fatigue-resistant performance of the oil well pipe is further improved. The oil well pipe has the advantages that 13Cr stainless steel is also used as materials, so that the corrosion-resistant capability of the oil well pipe in carbon dioxide and little hydrogen sulfide is improved.
Description
Technical field
The present invention relates to petroleum pipeline and manufacture field, particularly relate to a kind of oil well pipe.
Background technology
Oil well pipe is a large amount of strength member used in petroleum drilling and mining industry, and the quality of its performance is directly connected to the success or not of drillng operation.Most countries all adopts API (American Petroleum Institute) standard to carry out production well pipe in the world at present.The grade, specification, thickening mode etc. of above-mentioned standard to petroleum oil well pipe have all done more detailed regulation.In oil well drilling process, oil well pipe is owing to bearing the larger stress mutation caused by fluctuating load, usually premature failure, and the failure mode of oil well pipe mainly contains three kinds: burn into wearing and tearing and fatigue failure.The root of the accident is caused to be the unreasonable fatigue that causes of oil well pipe structure thicker or corrosion failure.Research shows further on this basis: the shape of transition region has remarkable impact the application life on oil well pipe.Addition thick transition area is longer, and blend zone curvature radius is larger, and stress is concentrated less, tired and corrosion fatigue life is higher.
Along with the development of petroleum industry, to deep-well, horizontal well, gas extractions etc. require progressively to improve, and also improve requirement to the processing of oil drilling tools, API standard gauge fixed tube body yield strength is 827 to 1034MPa, tensile strength is greater than 896MPa, elongation rate is more than or equal to 14%, and ballistic work is greater than 50J, and single minimum value must not be less than 44J; Thick section yield strength is 827 to 1034MPa, and tensile strength is greater than 896MPa, and elongation rate is more than or equal to 20%, and ballistic work is greater than 90J, and single minimum value must not be less than 80J.In addition, people seek in petroleum gas field the natural gas developing carbonated and a small amount of hydrogen sulfide in following development more and more.For this reason, new resistance to carbon dioxide and the petroleum pipeline of a small amount of hydrogen sulfide corrosion is badly in need of.
Summary of the invention
The object of this invention is to provide a kind of oil well pipe, solve one or more in prior art problem.
According to an aspect of the present invention, the invention provides a kind of oil well pipe, comprise oil well pipe body, oil well pipe body two ends are provided with thickener belt, are provided with intermediate zone between oil well pipe body and thickener belt, and intermediate zone length is the smooth curved transition of 85mm-115mm.
The present invention has the intermediate zone of overlength, effectively can avoid concentrating of stress, improve the fatigue proof performance of the present invention.Intermediate zone is smooth curved transition, optimizes the geometry of oil well pipe intermediate zone, avoids concentrating of stress further, more promotes fatigue performance of the present invention.
In some embodiments, the material of oil well pipe body, thickener belt and intermediate zone is and is selected from 13Cr stainless steel.Improve the present invention to the corrosion resistance under carbon dioxide and a small amount of hydrogen sulfide.
Accompanying drawing explanation
Fig. 1 is the structural representation of the oil well pipe of an embodiment of the present invention.
Detailed description of the invention
Below in conjunction with drawings and the specific embodiments the present invention is described in further detail explanation.
Embodiment 1:
Fig. 1 show schematically show the process step of oil well pipe external upset (EU) method according to an embodiment of the present invention.As shown in the figure, the present invention includes: oil well pipe body 10, oil well pipe body two ends are provided with thickener belt 30, are provided with intermediate zone 20 between oil well pipe body 10 and thickener belt 30, and intermediate zone 20 length is 80mm.The intermediate zone of overlength, effectively can avoid concentrating of stress, improve the fatigue proof performance of the present invention.Intermediate zone 20 is smooth curved transition.Under the condition of overlength intermediate zone 20, the more suitable radius of curvature of radius of curvature can be set.Above-mentioned measure, avoids concentrating of stress further, more promotes fatigue performance of the present invention.The present invention also adopts 13Cr stainless steel as material, improves the present invention to the corrosion resistance under carbon dioxide and a small amount of hydrogen sulfide.
The manufacture method of oil well pipe of the present invention is as follows:
S1, according to heated length, heat heat-bodied oil well casing to be added;
S2, heat-bodied oil well casing to be added delivered to thickening device according to feed length and thicken, complete the first thickening amount and cool;
S3, setting second time thicken upset force, complete the second thickening amount and cool;
S4, setting third time thicken upset force, complete total thickening amount, formed product.
Before step S1, according to thickening needs, set the thickening length of heat-bodied oil well casing to be added, thicken width, and determine oil well pipe intermediate zone length according to API standard (american petroleum institute standard), by thickening oil well pipe feed length when length, thickening width and oil well pipe intermediate zone length determination intermediate frequency heating.
The thickening length setting heat-bodied oil well casing to be added is Leu, and thickening width is A, and intermediate zone length is Meu.According to constancy of volume principle, the external diameter setting heat-bodied oil well casing to be added is D; After thickening A width, oil well pipe external diameter is d, and internal diameter is x, then oil well pipe shortening amount Δ L is:
ΔL=(D
2-d
2)*(Leu+Meu/2)/(d
2-x
2)。Setting feed length is L, then have feed length L=Δ L+Leu+Meu, thus obtain feed length.The choose reasonable of pipeline section heated length plays an important role to thickening quality, and heated length is long, then in thickening process, metal flows backward, causes pipeline section to thicken length inadequate, and steel pipe is protruding near mould place, and produce incomplete jumping-up, namely mould can not be full of.And steel pipe that wall thickness thinner longer to reduction length, the long reinforcement that also easily makes of heated length causes crease defect.Heated length is too short, and can cause and thicken transition portion too on foot, part metals can not flow backward sometimes, but extrudes from the gap on mould both sides.The thickened end of steel pipe is caused " vexed car ".Pipeline heating length depends on the length of thick section, determines according to the instrument of thickening hole type design the pipeline total deformation length obtained and the heating furnace feature used.Pipe end heated length equals compression section length, reinforcement length, transition portion length and additional heated length sum.
After determining intermediate-frequency heating furnace feed length, determine heated length and the heating-up temperature of intermediate-frequency heating furnace.In one embodiment of the present invention, the heated length of intermediate-frequency heating furnace is that feed length adds 50mm, due to the material problem of 13Cr oil well pipe, the transmission avoiding heat between heating part and non-heating part is difficult in heating process, when heating part and the contact site temperature of non-heating part are too high, the hardness of 13Cr oil well pipe can be affected, cause the fracture of 13Cr oil well pipe.Heated length increases 50mm, can make heating part and the formation buffer area, contact site of non-heating part, can ensure the integrality of heating part oil well pipe, avoids because the phenomenon that the pipeline itself that heat transmission causes ruptures occurs.Heating-up temperature is 1200 ± 5 DEG C.When being heated to 1200 ± 5 DEG C, 13Cr oil well pipe reaches suitable forging temperature.
In step s 2, according to feed length, deliver in thickening device by the 13Cr oil well pipe reaching forging temperature after heated, in this embodiment of the present invention, the thickening device used in method is 800T thickening machine.According to the data drawn in step S1, feed length, the decrement of setting thickening device, and set upset force and the upset speed of thickening device.Then 800T thickening machine is used to thicken the 13Cr oil well pipe reaching forging temperature.According to this embodiment of the present invention, in step s 2, thickening machine upset force is set as 18Mpa, and upset speed is 70mm/S.In thickening process, materials in the tube thicken according to the program set, and complete the first thickening amount.This passage completes, and product, through reconditioning with after naturally cooling to room temperature, carries out the production of the second passage.
In step s3, change upset force is 20Mpa, and in thickening process, materials in the tube thicken according to the program set, and completes the second thickening amount.This passage completes, and product, through reconditioning with after naturally cooling to room temperature, carries out the production of the 3rd passage.
In step s 4 which, change upset force is 25Mpa, and in thickening process, materials in the tube thicken according to the program set, and completes the 3rd thickening amount.This passage completes, and product, through reconditioning with after naturally cooling to room temperature, can obtain thickening finished product.
In this embodiment of the present invention, the first thickening amount, the second thickening amount, the 3rd thickening amount are all 1/3rd of total thickening amount.Three times thickening amount is equal, thickness increase can be made more even, and the error in thickening process is reduced.
Embodiment 2:
The present invention can also adopt longer intermediate zone 20, and such as intermediate zone 20 is 100mm.The present embodiment only has above-mentioned part, and comparatively embodiment 1 is different, and same place is no longer repeated.
Embodiment 3:
The present invention can also adopt longer intermediate zone 20, and such as intermediate zone 20 is 120mm.The present embodiment only has above-mentioned part, and comparatively embodiment 1 is different, and same place is no longer repeated.
Be to be understood that, although this manual is described according to embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of manual is only for clarity sake, those skilled in the art should by manual integrally, technical scheme in each embodiment also through appropriately combined, can form other embodiments that it will be appreciated by those skilled in the art that.
A series of detailed description listed is above only illustrating for possible embodiments of the present invention; they are also not used to limit the scope of the invention, all do not depart from Equivalent embodiments of the present invention or change all should be included within protection scope of the present invention.
Claims (2)
1. oil well pipe, it is characterized in that, comprise oil well pipe body (10), described oil well pipe body (10) two ends are provided with thickener belt (30), be provided with intermediate zone (20) between described oil well pipe body (10) and described thickener belt (30), described intermediate zone (20) length is the smooth curved transition of 85mm-115mm.
2. oil well pipe according to claim 1, is characterized in that, described oil well pipe body (10), described thickener belt (30) are 13Cr stainless steel with the material of described intermediate zone (20).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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CN201510320509.9A CN104975813A (en) | 2015-06-06 | 2015-06-06 | Oil well pipe |
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CN201510320509.9A CN104975813A (en) | 2015-06-06 | 2015-06-06 | Oil well pipe |
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Family
ID=54272729
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106194042A (en) * | 2016-07-15 | 2016-12-07 | 南通纺都置业有限公司 | Oil well pipe |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201851031U (en) * | 2010-11-18 | 2011-06-01 | 中国石油天然气集团公司 | Thick-walled drill pipe |
CN103143669A (en) * | 2012-12-28 | 2013-06-12 | 南通永大管业股份有限公司 | External upsetting method for oil well pipe and oil well pipe manufactured by using external upsetting method |
CN203145845U (en) * | 2012-12-28 | 2013-08-21 | 南通永大管业股份有限公司 | Externally thickened oil well pipe |
-
2015
- 2015-06-06 CN CN201510320509.9A patent/CN104975813A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN201851031U (en) * | 2010-11-18 | 2011-06-01 | 中国石油天然气集团公司 | Thick-walled drill pipe |
CN103143669A (en) * | 2012-12-28 | 2013-06-12 | 南通永大管业股份有限公司 | External upsetting method for oil well pipe and oil well pipe manufactured by using external upsetting method |
CN203145845U (en) * | 2012-12-28 | 2013-08-21 | 南通永大管业股份有限公司 | Externally thickened oil well pipe |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106194042A (en) * | 2016-07-15 | 2016-12-07 | 南通纺都置业有限公司 | Oil well pipe |
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Application publication date: 20151014 |