CN103614613B - Drill pipe joint and preparation method thereof - Google Patents
Drill pipe joint and preparation method thereof Download PDFInfo
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- CN103614613B CN103614613B CN201310571809.5A CN201310571809A CN103614613B CN 103614613 B CN103614613 B CN 103614613B CN 201310571809 A CN201310571809 A CN 201310571809A CN 103614613 B CN103614613 B CN 103614613B
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Abstract
The invention discloses a drill pipe joint, comprising the following elements: an iron element, an alloying element and microelements, wherein the microelements comprise the following components by mass percent: 0.25-0.32% of carbon element, 0.30-0.38% of molybdenum element, no more than 0.01% of sulfur element, and no more than 0.015% of phosphorus element, wherein the content of other elements is the same as the content of an API standard component. The invention discloses a preparation method of the drill pipe joint. The method comprises the following steps: smelting a tube blank; carrying out die-forging and molding treatment on the tube blank; quenching and tempering a forge piece. The components of the elements in the drill pipe joint are adjusted; since the content of the carbon element is reduced, the hardness of the drill pipe joint can be reduced, so as to reduce the corrosive effect of hydrogen sulfide on the drill pipe joint; the corrosion resistance of the drill pipe joint and the toughness of the drill pipe joint can be improved, so that the impact resistance of the drill pipe joint is improved and the possibility of an accident caused by fracture of the drill pipe joint is reduced. In addition, the drill pipe joint is low in manufacturing cost and can be applied to a large number of exploration work; therefore, production and application expenses are saved.
Description
Technical field
The present invention relates to oil exploration and cbm exploration field, particularly to a kind of tool joint and preparation method thereof.
Background technology
Drilling rod is the important tool in oil and gas exploration and exploitation.Conventional drilling rod is with API（American
Petroleum Institute, American Petroleum Institute）For tetra- grade of steels of E75, X95, G105 and S135 of standard, after letter
Numeral represents the SMYS of drill rod materials, continually developing and utilizing with petroleum resources, the acid-soluble oil of a large amount of sulfur-bearings
Gas field is developed, and because hydrogen sulfide can cause corrosion and hydrogen induced cracking (HIC) to Steel material, so that drilling rod is occurred in exploration process
Brittle fracture accident, drill rod materials are harder, higher to the sensitivity of hydrogen sulfide, occur the risk of corrosion bigger.
In prior art, in the development process of sulfur acid oil gas field, it is frequently used G105 drilling rod or the sulfur resistive of low grade of steel
Drilling rod.Tool joint used by steel G105 drilling rod is matched G105 tool joint, but due to G105 drilling rod connecting
Head hardness higher so that easily hydrogen sulfide corrosion in use in tool joint, lead to tool joint ftracture, cause mistake
Effect accident occurs；And for sulfur resistant drill pipe, cost is too high, it is unsuitable for using in a large number.
During realizing the present invention, inventor finds that prior art at least has problems with：
Although tool joint of the prior art employs the tool joint of G105 model, in actual applications due to hard
Spend the higher hydrogen-type corrosion that still easily cures, and the tool joint poor toughness of such model is so that the impact resistance of tool joint
Can be poor, easily make tool joint thorn leakage effect, and tool joint can make joint breaking lead to drill string when too corroded
Fall well, causes down-hole accident, oil field is produced and brings massive losses；And although sulfur resistant drill pipe corrosion resistance is preferably, cost
Higher, it is unsuitable for the use of a large amount of exploration operations, therefore existing tool joint can not meet the use needs of reality.
Content of the invention
Tool joint in order to solve the problems, such as prior art is unsatisfactory for, using needs, embodiments providing one kind
Tool joint.Described technical scheme is as follows：
On the one hand, there is provided a kind of tool joint, the elemental composition of described tool joint includes ferrum element, alloying element and
Trace element, described trace element includes following mass component：Carbon element content 0.25-0.32%, molybdenum element content 0.30-
0.38%, sulfur content is not more than 0.01%, and phosphorus element content is not more than 0.015%；Other constituent contents and API standard composition
Identical.
Further, described tool joint internal diameter size 6-10% less than API standard tool joint internal diameter size.
Preferably, the shoulder bevel diameter of described tool joint is bigger than the shoulder bevel diameter of API standard tool joint
4-6%.
On the other hand, there is provided a kind of preparation method of tool joint, the preparation method of described tool joint include following
Step：
Step 1：Trace Elements are 0.25-0.32% according to carbon, and molybdenum element is 0.30-0.38%, and element sulphur contains
Amount is not more than 0.01%, and phosphorus element content is not more than 0.015%, and other constituent contents are identical with API standard composition to smelt described brill
The pipe of knock-off joint；
Step 2：The described pipe smelted is carried out die-forging forming process, preliminarily forms tool joint model；
Step 3：Described tool joint forging after die-forging forming is carried out high temperature modifier treatment so that described tool joint
Tempered sorbite tissue in forging is more than or equal to 95%, and tissue grain size is more than or equal to 8 grades.
Preferably, described step 2 also includes expanding processing technique, specially：Described tool joint model is expanded
Footpath expands 25-33% so that described tool joint model diameter compares API standard tool joint model diameter.
Further, described preparation method also includes step 4, specially：Described tool joint after modifier treatment is entered
Row polish is processed.
Preferably, described step 4, specially：The internal diameter size of the described tool joint after modifier treatment is carried out essence
Processed is so that the tool joint internal diameter size that described tool joint internal diameter size compares API standard reduces 6-10%.
Further, described step 4, specially：The shoulder bevel diameter of the described tool joint after modifier treatment is entered
Row polish processes so that the shoulder bevel diameter of the tool joint than API standard for the shoulder bevel diameter of described tool joint
Expand 4-6%.
Preferably, described preparation method also includes step 5：Described tool joint is carried out after polish process, to institute
State tool joint bottom of the tooth chamfering circular arc and carry out rolling process.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought is：
Tool joint provided in an embodiment of the present invention and preparation method thereof, by entering element mass component in tool joint
Row adjustment, carbon element content is changed into 0.25-0.32%, molybdenum element content is changed into 0.30-0.38%, element sulphur and phosphorus element content
It is not more than 0.01% and 0.015% respectively, compares API standard, the present invention reduces carbon, sulfur and phosphorus element content in tool joint, can
Reduce hardness and the nonmetallic inclusion content of tool joint, thus reducing the corrosive effect to tool joint for the hydrogen sulfide；And molybdenum is first
Element can improve the corrosion resistance of tool joint and can improve the toughness of tool joint, the restriction of summary element so that
The shock resistance of tool joint improves, and substantially reduces and leads to the probability of down-hole accident because of tool joint fracture；
Additionally, low cost of manufacture of the present invention, can use in a large amount of exploration operations, greatly save production and using spending.
Brief description
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, will make to required in embodiment description below
Accompanying drawing be briefly described it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings
Accompanying drawing.
Fig. 1 is the flow chart of tool joint preparation method provided in an embodiment of the present invention；
Fig. 2 is the tool joint structural representation that further embodiment of this invention provides.
Wherein：1 male connection,
2 female adapters,
3 screw threads,
4 bottom of the tooth chamfering circular arcs,
D joint internal diameter size,
D shoulder bevel diameter.
Specific embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
Embodiment one
As shown in Fig. 2 embodiments providing a kind of tool joint, the elemental composition of described tool joint includes ferrum
Element, alloying element and trace element, described trace element includes following mass component：Carbon element content 0.25-0.32%,
Molybdenum element content 0.30-0.38%, sulfur content is not more than 0.01%, and phosphorus element content is not more than 0.015%；Other elements contain
Amount is identical with API standard composition.
Wherein, the embodiment of the present invention exists to the carbon in API standard tool joint, molybdenum element, element sulphur and P elements
Modify in content, and using the constituent content of API standard G105 tool joint as reference, therefore in the embodiment of the present invention its
Its constituent content is consistent with the constituent content of API standard tool joint, for example element silicon mass component about 0.20-0.26%, chromium unit
Plain mass component about 1.00-1.20%, manganese element mass component about 0.75-0.95% etc..Element quality in tool joint is become
Point be arranged such, by reducing carbon content, it is possible to decrease the hardness of tool joint so that tool joint is difficult the hydrogen-type corrosion that cures,
The intensity of required tool joint if carbon content is too low, can not be reached, if carbon content is higher than 0.32%, tool joint is easily subject to
To hydrogen sulfide corrosion, accordingly, as preferred, carbon mass component is about 0.3%；Molybdenum element can refine tool joint tissue
Crystal grain is so that tool joint tissue precision is higher, thus improving corrosion resistance and the toughness of tool joint, preferably, molybdenum
Element weight/mass percentage composition 0.35%, sulfur, P elements can cause red brittleness and cold brittleness to steel, belong to harmful element in steel, therefore
Sulfur to be reduced, the P elements content in steel.The above-mentioned elemental range of comprehensive restriction, tool joint can not only be made to meet intensity will
Ask the reduction impact to tool joint for the hydrogen sulfide, and improve the toughness of tool joint, increased tool joint impact resistance,
Can effectively solve the problem that the problem of tool joint longitudinal cracking in prior art.
The embodiment of the present invention, by being adjusted element mass component in API standard tool joint, reduces tool joint
Middle carbon, sulfur and phosphorus element content, it is possible to decrease the hardness of tool joint and nonmetallic inclusion content, thus reduce hydrogen sulfide to drilling rod
The corrosive effect of joint；And molybdenum element can obtain thinner tool joint component of organization with crystal grain thinning, thus improving drilling rod connecting
The corrosion resistance of head and can improve the toughness of tool joint, the restriction of summary element is so that the anti-impact of tool joint
Hit performance to improve, substantially reduce and lead to the probability of down-hole accident because of tool joint fracture；Additionally, manufacture of the present invention
Low cost, can use in a large amount of exploration operations, greatly save production and using spending.
As shown in Fig. 2 further, described tool joint internal diameter size D 6- less than API standard tool joint internal diameter size
10%.
As shown in Fig. 2 preferably, the shoulder bevel diameter d of described tool joint than API standard tool joint shoulder
The big 4-6% of chamfering diameter.
Wherein, tool joint internal diameter size D compares the tool joint internal diameter size of API standard and reduces 6-10%, tool joint
Shoulder bevel diameter d compare API standard tool joint shoulder bevel enlarged-diameter 4-6%, the wall of tool joint can be made
Thickness is improved such that it is able to improve the tensile strength of tool joint and torsional strength so that what tool joint reduced in hardness
Meanwhile, the tensile strength of tool joint and torsional strength can meet the intensity requirement of G105 standard, keep G105 tool joint
Object performance, and, tiny change in structure does not affect the use of tool joint, therefore, it is possible to of the prior art
G105 tool joint is interchangeable, and increased the practical function of tool joint.
Embodiment two
As shown in figure 1, embodiments providing a kind of preparation method of tool joint, the preparation of described tool joint
Method comprises the following steps：
Step 1：Trace Elements are 0.25-0.32% according to carbon, and molybdenum element is 0.30-0.38%, and element sulphur contains
Amount is not more than 0.01%, and phosphorus element content is not more than 0.015%, and other constituent contents are identical with API standard composition to smelt described brill
The pipe of knock-off joint；
Step 2：The described pipe smelted is carried out die-forging forming process, preliminarily forms described tool joint model；
Step 3：Described tool joint forging after die-forging forming is carried out high temperature modifier treatment so that described tool joint
Tempered sorbite tissue in forging is more than or equal to 95%, and tissue grain size is more than or equal to 8 grades.
Wherein, the tool joint in the embodiment of the present invention and the tool joint structure all same in above example, here
Repeat no more.
The embodiment of the present invention passes through to change respective element composition in step 1, makes the hardness fall of the blank tube material of tool joint
Low, toughness improves；Die-forging forming is carried out by step 2 and processes the tool joint model needed for obtaining；By step 3 so that boring
Knock-off joint modeling material yield strength can reach 100-115kpsi, and tool joint is rushed in -20 DEG C of the full-scale Charpy of longitudinal direction
Hit function and be more than or equal to 110J, laterally full-scale Charpy impact function is more than or equal to 80J, and it is residual to reduce tool joint circumference
Residue stress, so can prevent the generation of tool joint stress corrosion cracking phenomenon, summary step, the embodiment of the present invention is effective
Reduce tool joint material hardness, improve material transverse impact toughness and tissue grain size, reduce tool joint longitudinal direction and
Circumferential residual stress, thus effectively improve tool joint stress corrosion resistant and the ability preventing joint cracking.
Preferably, described step 2 also includes expanding processing technique, specially：Described tool joint model is expanded
Footpath is so that described tool joint model diameter compares drilling rod joint blank enlarged-diameter 25-33% before die forging.Wherein, carrying out mould
When forging is processed, one or many expanding technology can be carried out to tool joint, make tool joint model diameter meet limited expansion
Footpath scope, in the expanding scope being limited, limits so that tool joint can be in longitudinal direction to the scope of element in conjunction with step 1
With laterally all obtain preferable metal flow performance such that it is able to obtain preferable vertical and horizontal toughness so that tool joint
Shock resistance be improved, the problem of the longitudinal easily cracking of effectively solving tool joint.In tool joint forging through later
After continuous processed, the tool joint diameter of molding is consistent with API standard diameter, carries out thus can achieve with existing tool joint
Exchange, increase the practicality of tool joint.
Further, described preparation method also includes step 4, specially：Described tool joint after modifier treatment is entered
Row polish is processed.
As shown in Fig. 2 preferably, described step 4, specially：Internal diameter by the described tool joint after modifier treatment
Dimension D carries out polish process so that described tool joint internal diameter size D compares the tool joint internal diameter size contracting of API standard
Little 6-10%.
As shown in Fig. 2 further, described step 4, specially：Shoulder by the described tool joint after modifier treatment
Chamfering diameter d carries out polish process so that the shoulder bevel diameter d of described tool joint is than the tool joint of API standard
Shoulder bevel enlarged-diameter 4-6%.
Wherein, the tool joint internal diameter size that tool joint internal diameter size D compares API standard is reduced by 6- by step 4
10%, the shoulder bevel diameter d of tool joint is compared shoulder bevel enlarged-diameter 4-6% of the tool joint of API standard, can make
The wall thickness of tool joint is improved such that it is able to improve the tensile strength of tool joint and torsional strength so that drilling rod connecting
While hardness reduces, the tensile strength of tool joint and torsional strength can meet the intensity requirement of G105 standard, guarantor to head
Hold the object performance of G105 tool joint, and, tiny change in structure does not affect the use of tool joint, therefore, it is possible to
It is interchangeable with G105 tool joint of the prior art, increased the practical function of tool joint.
As shown in Fig. 2 preferably, described preparation method also includes step 5：Described tool joint is carried out at polish
After reason, rolling process is carried out to described tool joint bottom of the tooth chamfering circular arc 4, tool joint thread so can be prevented to lose efficacy.
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvement made etc., should be included within the scope of the present invention.
Claims (7)
1. a kind of tool joint, the elemental composition of described tool joint includes ferrum element, alloying element and trace element, its feature
It is, described trace element includes following mass component：Carbon element content 0.3%, molybdenum element content 0.30-0.38%, sulfur
Constituent content is not more than 0.01%, and phosphorus element content is not more than 0.015%；Other constituent contents are identical with API standard composition；
Wherein, described tool joint internal diameter size 6-10% less than API standard tool joint internal diameter size；
The shoulder bevel diameter 4-6% bigger than the shoulder bevel diameter of API standard tool joint of described tool joint.
2. a kind of preparation method of the tool joint described in claim 1 is it is characterised in that the preparation method of described tool joint
Comprise the following steps：
Step 1：Trace Elements are 0.3% according to carbon, and molybdenum element is 0.30-0.38%, and sulfur content is not more than
0.01%, phosphorus element content is not more than 0.015%, and other elemental compositions smelt described tool joint according to API standard composition
Pipe；
Step 2：The described pipe smelted is carried out die-forging forming process, preliminarily forms tool joint model；
Step 3：Described tool joint forging after die-forging forming is carried out high temperature modifier treatment so that described tool joint forging
In tempered sorbite tissue be more than or equal to 95%, tissue grain size be more than or equal to 8 grades.
3. the preparation method of tool joint according to claim 2 is it is characterised in that described step 2 is expanding processing work
Skill, specially：By described tool joint model carry out expanding so that described tool joint model diameter to compare expanding front blank straight
Footpath expands 25-33%.
4. the preparation method of tool joint according to claim 2 is it is characterised in that described preparation method also includes step
4, specially：Described tool joint after modifier treatment is carried out polish process.
5. the preparation method of tool joint according to claim 4 is it is characterised in that described step 4 is specially：Will be quenched
The internal diameter size of the described tool joint after process carries out polish process so that described tool joint internal diameter size compares API
The tool joint internal diameter size of standard reduces 6-10%.
6. the preparation method of tool joint according to claim 4 is it is characterised in that described step 4 is specially：Will be quenched
The shoulder bevel diameter of the described tool joint after process carries out polish process so that the shoulder bevel of described tool joint is straight
Shoulder bevel enlarged-diameter 4-6% of the tool joint of API standard is compared in footpath.
7. the tool joint according to any one of claim 4-6 preparation method it is characterised in that described preparation method also
Including step 5：Described tool joint is carried out after polish process, described tool joint bottom of the tooth chamfering circular arc is carried out at rolling
Reason.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310571809.5A CN103614613B (en) | 2013-11-13 | 2013-11-13 | Drill pipe joint and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310571809.5A CN103614613B (en) | 2013-11-13 | 2013-11-13 | Drill pipe joint and preparation method thereof |
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| CN103614613A CN103614613A (en) | 2014-03-05 |
| CN103614613B true CN103614613B (en) | 2017-02-08 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106339529A (en) * | 2016-08-11 | 2017-01-18 | 上海大学 | Method for quickly evaluating tensile property of degradation drill rod joint |
| CN107186149B (en) * | 2017-07-19 | 2023-09-12 | 无锡双马钻探工具有限公司 | One-die two-piece forging die and method for drill pipe joint |
Citations (3)
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|---|---|---|---|---|
| CN101275207A (en) * | 2007-03-27 | 2008-10-01 | 宝山钢铁股份有限公司 | H2S-corrosion-resistant tool joint for petroleum drill pipe and hot treatment method thereof |
| CN102704863A (en) * | 2012-06-20 | 2012-10-03 | 中国石油天然气集团公司 | Hot crack prevention internal screw joint of drill rod and manufacturing method for internal screw joint |
| CN102896471A (en) * | 2012-10-22 | 2013-01-30 | 江苏和信石油机械有限公司 | Automatic production method of oil drill rod joints |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7210710B2 (en) * | 2004-03-01 | 2007-05-01 | Omsco, Inc. | Drill stem connection |
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2013
- 2013-11-13 CN CN201310571809.5A patent/CN103614613B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101275207A (en) * | 2007-03-27 | 2008-10-01 | 宝山钢铁股份有限公司 | H2S-corrosion-resistant tool joint for petroleum drill pipe and hot treatment method thereof |
| CN102704863A (en) * | 2012-06-20 | 2012-10-03 | 中国石油天然气集团公司 | Hot crack prevention internal screw joint of drill rod and manufacturing method for internal screw joint |
| CN102896471A (en) * | 2012-10-22 | 2013-01-30 | 江苏和信石油机械有限公司 | Automatic production method of oil drill rod joints |
Non-Patent Citations (1)
| Title |
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| "高酸性气田钻井中钻具的选材评价";万里平等;《材料保护》;20061130(第11期);第72-73页 * |
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