CN2779036Y

CN2779036Y - Screw-threaded drilling rod

Info

Publication number: CN2779036Y
Application number: CN 200420054875
Authority: CN
Inventors: 吴华; 张毅; 罗日新; 陆金福; 朴龙华
Original assignee: Shanghai Jiajun Petroleum Equipment Fittings Co Ltd
Current assignee: BEIJING HUAYOU XINGYE ENERGY TECHNOLOGY CO., LTD.
Priority date: 2004-12-29
Filing date: 2004-12-29
Publication date: 2006-05-10
Anticipated expiration: 2014-12-29

Abstract

The utility model relates to a screw-thread connecting joint, particularly a screw-thread connecting drilling rod. The utility model has the technical scheme that both ends of a pipe body of the drilling rod are respectively provided with female threads and male threads connected with each other, and all pipe bodies of the drilling rod are connected only by screw threads. The inner and the outer walls at both ends of the pipe bodies of the drilling rod are thickened, the external diameter of the thickened part is longer than the external diameter of the pipe bodies and the internal diameter of the thickened part is shorter than the internal diameter of the pipe bodies. The combined part of the thickened segment of the outer wall at the end of the female thread of the pipe body of the drilling rod and the pipe body of the drilling rod forms an abrupt change part, and steps are formed at the abrupt change part. The screw threads are hook-shaped screw threads. Moreover, the bearing surface of the hook-shaped screw threads forms an included angle alpha with the centerline of the pipe bodies of the drilling rod, and the included angle alpha is less than 90 DEG. The utility model changes the structure and the processing technique of the drilling rod, therefore the performance of the drilling rod can be improved. The utility model overcomes poor performance in the use of the drill rod produced by the existing API standard in oilfields. Meanwhile, the utility model simplifies the manufacture technique of drill rods and has low cost.

Description

A kind of drilling rod that is threaded

Technical field

The utility model relates to thread connecting joint, specifically a kind of drilling rod that is threaded.

Background technology

Present drilling rod is all by the API standard production, and it is to connect into a complete drilling rod product by tool-joint (male and female tool-joint car respectively has the male and female screw thread of API, and screw thread is the digital screw thread of API) and drill pipe body butt welding, sees Fig. 1.Tool-joint is pressed API SPEC 7 standard production, and drill pipe body is pressed APISPEC 5D standard production, and every functional performance of finished product drilling rod is by API RP 7G requirement.

Summary of the invention

The purpose of this utility model is to design a kind of drilling rod that is threaded, by changing the structure of drilling rod, processing technology, improve the performance of drilling rod, overcome the bad performance of drilling rod in use in the oil field of present API standard production, simplify the drilling rod production technology, reduce cost.

According to design scheme provided by the utility model, the two ends of drill pipe body are respectively can interconnective box thread and male thread, and between each drill pipe body only by being threaded.

The inside and outside wall thickening at drill pipe body two ends, the external diameter of thickening place is greater than the body external diameter, and the internal diameter of thickening place is less than internal diameter of tube body.The outer wall thick section of drill pipe body box thread one end and the joint portion of drill pipe body have 〉=3 millimeters sudden change, form step in sudden change place.Screw thread is a hook screw thread, and the angle α of hook screw thread bearing surface and drill pipe body center line is less than 90 °.

The small end of male thread has interior torque resistant step, and the big end of male thread has outer torque resistant step.The small end of box thread has interior torque resistant step, and the big end of box thread has outer torque resistant step.The torque resistant step contacts with the interior torque resistant step of the small end of box thread in the small end of male thread, and the outer torque resistant step of the big end of male thread contacts with the outer torque resistant step of the big end of box thread.

Screw thread is the screw thread of multistage tapering.Between the interior torque resistant step of the interior torque resistant step of male thread small end and box thread small end is radial interference fit, or/and be radial interference fit between the outer torque resistant step of the outer torque resistant step of the big end of male thread and the big end of box thread.

Drilling rod is the important tool of oil drilling, because the working condition harshness of drilling rod is therefore also very high to the drilling rod requirement, type patent of the present invention uses the weld seam of middle tube body and tool-joint to fracture easily at existing API standard drilling rod in the oil field; Defectives such as the easy fracture of the root of API male thread, shackle is easy thread gluing on the screw thread.Structure, production technology to API standard drilling rod are carried out diverse transformation.Novel non-API drilling rod designs a kind of novel screw thread, and the male thread end has torque resistant step P.Connect by the hook-type taper thread, box thread M directly connects the male thread G of body.Moment of torsion when transmitting the drilling rod drilling well by the torque resistant step, thus reached the operating mode that satisfies oil drill rocker.Cancelled tool-joint on the present API drilling rod and drill pipe body to welding line, avoided fracture to welding line.Again because the body male thread the end also have the torque resistant step U of the small end of torque resistant step P and box thread to hold out against sealing function mutually, protected the male and female screw thread not pierced through by mud.Multistage taper thread has improved the torque resistant performance.Improved the anti-stick button performance of sealing performance of screw thread.

Owing to changed the structure of drilling rod, also changed the technology of producing, complicated flat welding process and tool-joint production technology have all been cancelled, the substitute is the male and female screw thread processing of the simple drill pipe body of technology, greatly reduce cost.

The utility model compared with prior art has marked improvement, is in particular in:

1, because the carrying angle is negative angle (3 a °) screw thread,, in use in the oil field, the bigger power that lifts is arranged than the digital screw thread of drilling rod with API60 °.The negative angle screw thread does not produce radial component when lifting, screw thread does not have peripheral stress, has improved the corrosion resistance of metal.

2, the drill pipe body inwall also has torque resistant step P and U; like this since two drill pipe body male and female screw thread torque resistant step P and U end face hold out against mutually; play sealing function, made the high-pressure slurry that flows in the drill pipe body can not contact screw thread, also protected screw thread not to be pierced.

3, owing to do not weld, drill pipe body is bulk heat treatmet, so drilling rod has not just had the hidden danger of welding seam breaking in the oil drilling operating mode.

4, do not have welding procedure, simplified the production technology of drilling rod greatly, greatly reduce the cost of production of drilling rod yet.

Description of drawings

The jackrod structure of Figure 1A PI standard.

The jackrod structure form of Fig. 2 this patent.

The hook screw thread of Fig. 3 this patent.

The specific embodiment

As shown in the figure: the two ends of drill pipe body 8 are respectively can interconnective box thread 1 and

male thread

2, and 8 of each drill pipe bodies are only by being threaded.The inside and outside wall thickening at drill pipe body 8 two ends, the external diameter of thickening place is greater than the body external diameter, and the internal diameter of thickening place is less than internal diameter of tube body.

The outer wall thick section of drill pipe body 8 box threads one end and the joint portion of drill pipe body 8 have 〉=3 millimeters sudden change, form step 3 in sudden change place.Screw thread is a hook screw thread, and the angle α of hook screw thread bearing surface 9 and drill pipe body 8 center lines is less than 90 °.The small end of male thread 2 has interior torque resistant step 4, and the big end of male thread 2 has outer torque resistant step 5.

The small end of box thread 1 has interior torque resistant step 7, and box thread 1 big end has outer torque resistant step 6.Torque resistant step 4 contacts with the interior torque resistant step 7 of the small end of box thread 1 in the small end of male thread 2, and the outer torque resistant step 5 of the big end of male thread 2 contacts with the outer torque resistant step 6 of the big end of box thread 1.

Screw thread is the screw thread of multistage tapering.Between the interior torque resistant step 7 of the interior torque resistant step 4 of male thread 2 small ends and box thread 1 small end is radial interference fit, or/and be radial interference fit between the outer torque resistant step 6 that the outer torque resistant steps 5 of male thread 2 big ends and box thread 1 are held greatly.

Two concrete processing examples are described below:

One: 27/8 G105 drilling rod of embodiment

The thickening length L eu of this drill pipe body, Leu=160mm.The thickening form is an internal-external thickening, external upset (EU) diameter 97mm, and internally upset internal diameter is 50mm; The hook screw thread G that processes on extra strong pipe one end of drill pipe body: the hook screw thread M that processes on the other end, thread taper 1: 6, pitch 6.35mm, tooth depth 2mm, pilot angle be 20 °, the carrying angle be-3 °, be parallel to the steel pipe axis at the bottom of tooth top, the tooth, the small end of drill pipe body male thread has male thread torque resistant step P, there is male thread torque resistant step Q the big end of male thread.The small end of drill pipe body box thread has box thread torque resistant step U, there is box thread torque resistant step E the big end of box thread, and the diameter at the external upset (EU) place of box thread is not gradual change, the sudden change K of 6mm is arranged, the whole copper facing of screw thread.

Two: 27/8 G105 drilling rod of embodiment

The thickening length L eu of this drill pipe body, Leu=160mm.The thickening form is an internal-external thickening, external upset (EU) diameter 97mm, and internally upset internal diameter is 50mm, processes on extra strong pipe one end of drill pipe body Two The level taperingHook screw thread G; The hook screw thread M that processes on the other end, thread taper 1: 6, pitch 6.35mm, tooth depth 2mm, pilot angle be 20 °, the carrying angle be-3 °, be parallel to the steel pipe axis at the bottom of tooth top, the tooth, the small end of drill pipe body male thread has male thread torque resistant step P, there is male thread torque resistant step Q the big end of male thread.The small end of drill pipe body box thread has box thread torque resistant step U, there is box thread torque resistant step E the big end of box thread, and the diameter at the external upset (EU) place of box thread is not gradual change, the sudden change K of 6mm is arranged, the whole copper facing of screw thread.

11 is female tool-joint among Fig. 1, and 12 is weld seam, and 13 is public tool-joint.

Claims

1, a kind of drilling rod that is threaded is characterized in that: the two ends of drill pipe body (8) are respectively can interconnective box thread (1) and male thread (2), and between each drill pipe body (8) only by being threaded.

2, according to the described drilling rod that is threaded of claim 1, it is characterized in that: the inside and outside wall thickening at drill pipe body (8) two ends, the external diameter of thickening place is greater than the body external diameter, and the internal diameter of thickening place is less than internal diameter of tube body.

3, according to the described drilling rod that is threaded of claim 1, it is characterized in that: the outer wall thick section of drill pipe body (8) box thread one end and the joint portion of drill pipe body (8) have 〉=3 millimeters sudden change, form step (3) in sudden change place.

4, according to the described drilling rod that is threaded of claim 1, it is characterized in that: screw thread is a hook screw thread, and the angle α of bearing surface of hook screw thread (9) and drill pipe body (8) center line is less than 90 °.

5, according to the described drilling rod that is threaded of claim 1, it is characterized in that: the small end of male thread (2) has interior torque resistant step (4), and the big end of male thread (2) has outer torque resistant step (5).

6, according to the described drilling rod that is threaded of claim 1, it is characterized in that: the small end of box thread (1) has interior torque resistant step (7), and the big end of box thread (1) has outer torque resistant step (6).

7, according to claim 4 or the 5 or 6 described drilling rods that are threaded, it is characterized in that: torque resistant step (4) contacts with the interior torque resistant step (7) of the small end of box thread (1) in the small end of male thread (2), and the outer torque resistant step (5) of the big end of male thread (2) contacts with the outer torque resistant step (6) of the big end of box thread (1).

8, according to claim 1 or the 4 described drilling rods that are threaded, it is characterized in that: screw thread is the screw thread of multistage tapering.

9, according to the described drilling rod that is threaded of claim 1, it is characterized in that: between the interior torque resistant step (7) of the interior torque resistant step (4) of male thread (2) small end and box thread (1) small end, be radial interference fit, or/and be radial interference fit between the outer torque resistant step (6) that the outer torque resistant step (5) of the big end of male thread (2) and box thread (1) are held greatly.