CN105114007A - Anti-corrosion oil casing coupling containing carbon, chromium and molybdenum elements - Google Patents
Anti-corrosion oil casing coupling containing carbon, chromium and molybdenum elements Download PDFInfo
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- CN105114007A CN105114007A CN201510599258.2A CN201510599258A CN105114007A CN 105114007 A CN105114007 A CN 105114007A CN 201510599258 A CN201510599258 A CN 201510599258A CN 105114007 A CN105114007 A CN 105114007A
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- thread
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- oil casing
- casing body
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Abstract
The invention provides an anti-corrosion oil casing coupling containing carbon, chromium and molybdenum elements. The coupling is used for being connected with oil casing bodies (1). The two ends of the coupling (3) are each provided with an internal thread (4) and connected with one oil casing body (1). External threads (2) are arranged at the ends of the oil casing bodies (1). The external threads (2) and the internal threads (4) are novel buttress conical threads. The thread pitch P is set to be 2 thread/in, and the thread tops are parallel to a pipe bus. The oil casing bodies (1) and the coupling (3) are made of carbon-chromium-molybdenum steel. The internal threads and the external threads are threads with the thread pitch being 2 thread/in. Thread screwing speed is greatly increased, and thread screwing and unscrewing efficiency is improved. The carbon-chromium-molybdenum steel material is adopted, and corrosion resistance is improved.
Description
Technical field
The invention belongs to oil exploitation drilling equipment technical field, relate to oil casing threaded link technique and the aseptic technic of drilling equipment, particularly one is containing middle carbon chrome molybdenum element rust-proof oil casing coupling.
Background technology
The oil bushing threaded connector of API standard is the most frequently used oil sleeve joint of China, and the leading products of each tubing and casing factory of Ye Shi China, this product technology is ripe, is easy to processing., structurally still there are some intrinsic defects in this tubing and casing, and it is low etc. as above to detain efficiency, limits the use of API tubing and casing.
According to statistics in world's oil gas field about 1/3 containing hydrogen sulfide gas.The many oil fields of China are as all contained hydrogen sulfide in the oil-gas Layer in the oil fields such as Sichuan, long celebrating, North China, Xinjiang, Jiang-Han Area, grand celebration, and wherein especially for Sichuan oilfield, it corrodes one of the most serious oil gas field in the world.Also many hydrogen sulfide containing oil gas fields are had abroad, as the Barrow house oil field of the U.S., Canadian truncation that oil field, gulf.Ordinary casing is when for hydrogen sulfide containing petroleum resources exploitation, sleeve pipe is under the effect of applied stress and hydrogen sulfide gas, often stressed far below brittle failure (this phenomenon is called H 2 S stress corrosion) occurs suddenly during itself yield strength, the lighter causes casing string or whole mouth well to scrap, severe one can cause blowout, make hydrogen sulfide together excessive with oil gas, cause the considerable damage of whole bench drill machine and surrounding ecological environment.Therefore, exploit hydrogen sulfide containing petroleum resources and just must use hydrogen sulfide corrosion resistant oil pipes.
Summary of the invention
The object of this invention is to provide a kind of containing middle carbon chrome molybdenum element rust-proof oil sleeve pipe, improve helicitic texture and material, shackle efficiency and corrosion resistance in raising, make the oil gas hole condition of its inclement condition that more conforms.
In order to solve the problems of the technologies described above, the invention provides a kind of containing middle carbon chrome molybdenum element rust-proof oil casing coupling, it is for the connection of tubing and casing body 1, the two ends of described box cupling 3 are equipped with internal thread 4, and connect a tubing and casing body 1 respectively, tubing and casing body 1 end is provided with external screw thread 2, described external screw thread 2 and internal thread 4 adopt novel partially trapezoidal tapered tread, its pitch P is set as 2 teeth/in, thread crest is parallel to tubing bus, carbon chrome molybdenum system steel in the material employing of described tubing and casing body 1 and box cupling 3.
Wherein, surface, described tubing and casing body 1 inside and outside, box cupling 3 surfaces externally and internally, internal thread 4, external screw thread 2 and junction thereof are all coated with corrosion-inhibiting coating.
The present invention, compared with prior art, internal and external threads all adopts the screw thread of 2 teeth/in pitch, comparatively the conventional 8 teeth/in pitch screw of API, and make-up speed increases greatly, so improve shackle efficiency on it; Adopt containing middle carbon chrome molybdenum element steel pipe material simultaneously, solve Anticorrosion from raw material aspect; Enhance antiseptic effect in product surfaces externally and internally anticorrosion with painting coating simultaneously.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of tubing and casing body male end of the present invention;
Fig. 3 is the structural representation of tubing and casing body female end of the present invention;
Fig. 4 is the enlarged diagram of helicitic texture of the present invention;
In figure, 1-tubing and casing body, 2-external screw thread, 3-box cupling, 4-internal thread.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Should be noted that, " connection " described in the application and the word for expressing " connection ", as " being connected ", " being connected " etc., both having comprised a certain parts with another parts is directly connected, and also comprises a certain parts and is connected with another parts by miscellaneous part.
As shown in Figure 1, Figure 2, Figure 3, Figure 4, the invention provides a kind of containing middle carbon chrome molybdenum element rust-proof oil casing coupling, it is for the connection of tubing and casing body 1, the two ends of described box cupling 3 are equipped with internal thread 4, and connect a tubing and casing body 1 respectively, tubing and casing body 1 end is provided with external screw thread 2, described external screw thread 2 and internal thread 4 adopt novel partially trapezoidal tapered tread, its pitch P is set as 2 teeth/in, thread crest is parallel to tubing bus, carbon chrome molybdenum system steel in the material employing of described tubing and casing body 1 and box cupling 3.
Wherein, surface, described tubing and casing body 1 inside and outside, box cupling 3 surfaces externally and internally, internal thread 4, external screw thread 2 and junction thereof are all coated with corrosion-inhibiting coating.
The present invention, compared with prior art, internal and external threads all adopts the screw thread of 2 teeth/in pitch, comparatively the conventional 8 teeth/in pitch screw of API, and make-up speed increases greatly, so improve shackle efficiency on it; Adopt containing middle carbon chrome molybdenum element steel pipe material simultaneously, solve Anticorrosion from raw material aspect; Enhance antiseptic effect in product surfaces externally and internally anticorrosion with painting coating simultaneously.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (2)
1. one kind contains middle carbon chrome molybdenum element rust-proof oil casing coupling, it is for the connection of tubing and casing body (1), it is characterized in that, the two ends of described box cupling (3) are equipped with internal thread (4), and connect a tubing and casing body (1) respectively, tubing and casing body (1) end is provided with external screw thread (2), described external screw thread (2) and internal thread (4) adopt novel partially trapezoidal tapered tread, its pitch P is set as 2 teeth/in, thread crest is parallel to tubing bus, carbon chrome molybdenum system steel in the material employing of described tubing and casing body (1) and box cupling (3).
2. one according to claim 1 is containing middle carbon chrome molybdenum element rust-proof oil casing coupling, it is characterized in that, surface, described tubing and casing body (1) inside and outside, box cupling (3) surfaces externally and internally, internal thread (4), external screw thread (2) and junction thereof are all coated with corrosion-inhibiting coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510599258.2A CN105114007A (en) | 2015-09-18 | 2015-09-18 | Anti-corrosion oil casing coupling containing carbon, chromium and molybdenum elements |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510599258.2A CN105114007A (en) | 2015-09-18 | 2015-09-18 | Anti-corrosion oil casing coupling containing carbon, chromium and molybdenum elements |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105114007A true CN105114007A (en) | 2015-12-02 |
Family
ID=54662093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510599258.2A Pending CN105114007A (en) | 2015-09-18 | 2015-09-18 | Anti-corrosion oil casing coupling containing carbon, chromium and molybdenum elements |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105114007A (en) |
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2015
- 2015-09-18 CN CN201510599258.2A patent/CN105114007A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151202 |