CN204729023U - A kind of large hydrophthalmia high resistance turns round joint of petroleum drill rod - Google Patents

Abstract

The utility model relates to a large water hole high torsion-resistant oil drill pipe joint in the field of oil and gas well drilling, mainly comprising a male joint (1), a secondary shoulder sealing surface (2), a connecting thread (3), and a main shoulder sealing surface (4) and the female joint (5), characterized in that the outer diameters of the male joint (1) and the female joint (5) are both 184.2 mm, and the inner diameters of the male joint (1) and the female joint (5) are both 116.06 mm , the middle diameter of the base surface of the connecting thread (3) is 150.65mm, and the connecting surface of the inner diameter of the male joint (1) and the female joint (5) is completely flush; both the male joint (1) and the female joint (2) adopt The steel material whose strength is greater than or equal to 140,000 psi; the taper used for the connecting thread (3) is between 1:12 and 1:20. The utility model can be used in deep wells, ultra-deep wells, extended displacement wells and other wells to reduce the hydraulic pressure loss of drill pipe joints and improve the hydraulic transmission efficiency of drill strings.

Description

A large water eye and high torsion resistance oil drill pipe joint

technical field

The utility model relates to the field of oil and gas well drilling, in particular to an oil drill pipe joint with large water holes and high torsion resistance.

Background technique

In order to solve the problems caused by the increase of drilling depth and difficulty in the process of drilling oil and gas wells, while new drilling technologies are constantly emerging, in order to meet the needs of new drilling technologies, non-API standard oil drill pipe joints have appeared one after another. The non-standard joint structure represented by the double-shoulder joint has received good results in field use. Due to its reasonable structural design, the double-shoulder joint makes the stress distribution more uniform than that of the API joint, which can greatly reduce the occurrence of joint failure accidents. Although there are abundant literature reports on double-shoulder joints, the purpose of their structural design is mostly to improve the torsional performance or sealing performance of double-shoulder joints, but it is relatively deficient in reducing hydraulic pressure loss and increasing the size of water holes. With the emergence of more and more special wells such as deep wells, ultra-deep wells, and extended-reach wells, people pay more and more attention to the hydraulic transmission efficiency of the drill string. The deeper the well, the greater the pressure loss and power loss of the drill string , which will directly lead to insufficient water power of the drill bit, thereby affecting the drilling speed. Therefore, reducing the hydraulic pressure loss of the drill string has become one of the main directions for the optimal design of the drill string structure.

Contents of the invention

The purpose of the utility model is to design an oil drill pipe joint with a large water hole structure and high torsion resistance that can be widely used in the field of oil and gas well drilling.

The technical scheme of the utility model is as follows: including the male joint (1), the auxiliary shoulder sealing surface (2), the connecting thread (3), the main shoulder sealing surface (4) and the female joint (5), the male joint (1) It is connected with the female joint (5) through the connecting thread (3), and the two ends of the connecting thread (3) are respectively the auxiliary shoulder sealing surface (2) and the main shoulder sealing surface (4), which is characterized in that: the male joint ( 1) and the outer diameter of the female joint (5) are both 184.2mm, the inner diameters of the male joint (1) and the female joint (5) are both 116.06mm, the base diameter of the connecting thread (3) is 150.65mm, and the male The inner diameter connecting surfaces of the coupling (1) and the coupling (5) are completely flush.

Both the male joint (1) and the female joint (2) of the drill pipe joint are made of steel with a steel strength greater than or equal to 140,000 psi.

The taper used for the connecting thread (3) of the drill pipe joint is between 1:12 and 1:20.

The utility model has the advantages that: on the basis of the traditional double-shouldered structure, the large water hole structure, the small taper thread structure and the design scheme of ultra-high-strength materials are adopted, which greatly improves the torsional strength of the drill pipe joint. The hydraulic efficiency of the joint is improved. If the non-standard large inner diameter drill pipe is used together, the hydraulic pressure loss can be reduced by more than 50% compared with the drill string composed of API S135 steel grade 5" drill pipe, thereby greatly improving the hydraulic pressure of the drill bit. It can also increase the drilling pressure in horizontal well drilling. The base diameter of the connecting thread is also redesigned accordingly, so that the torsional strength ratio between the male joint and the female joint is more reasonable, which is consistent with the commonly used API S135 The torsional strength of the steel grade NC50 joint is about 30% higher than that of the joint. Since the male and female joints are connected with a completely flush inner diameter, the flow of the mud is smoother, without turbulence, and it can also avoid cement or rock debris was blocked here.

Description of drawings

Accompanying drawing 1 is the connection sectional schematic diagram of the utility model.

Detailed ways

As shown in the drawings, the utility model includes a male joint (1), a secondary shoulder sealing surface (2), a connecting thread (3), a main shoulder sealing surface (4) and a female joint (5), a male joint (1 ) and the female joint (5) are connected through the connecting thread (3), and the two ends of the connecting thread (3) are respectively the auxiliary shoulder sealing surface (2) and the main shoulder sealing surface (4).

Among them, the outer diameters of the male joint (1) and the female joint (5) are both 184.2 mm, the inner diameters of the male joint (1) and the female joint (5) are both 116.06 mm, and the base diameter of the connecting thread (3) is 150.65mm, and the connecting surfaces of the inner diameters of the male connector (1) and the female connector (5) are completely flush. Both the male joint (1) and the female joint (2) are made of steel with a steel strength greater than or equal to 140,000 psi. The taper used by the connecting thread (3) is between 1:12 and 1:20. The utility model can be used in deep wells, ultra-deep wells, extended displacement wells and other wells to reduce the hydraulic pressure loss of the drill pipe joint, improve the hydraulic transmission efficiency of the drill string, and eliminate the mud turbulence caused by the different inner diameters at the mating surface of the auxiliary shoulder of the joint. And avoid the situation where cement or cuttings stay here.

Claims (3)

1. a large hydrophthalmia high resistance turns round joint of petroleum drill rod, comprise male joint (1), slave station shoulder seal face (2), connect screw thread (3), main shoulder sealing surface (4) and female joint (5), male joint (1) is connected by connecting screw thread (3) with female joint (5), the two ends connecting screw thread (3) are slave station shoulder seal face (2) and main shoulder sealing surface (4) respectively, it is characterized in that: the external diameter of male joint (1) and female joint (5) is 184.2mm, the internal diameter of male joint (1) and female joint (5) is 116.06mm, the base level pitch diameter connecting screw thread (3) is 150.65mm, and the internal diameter joint face of male joint (1) and female joint (5) flushes completely.

2. the large hydrophthalmia high resistance of one according to claim 1 turns round joint of petroleum drill rod, it is characterized in that: male joint (1) and female joint (2) all adopt steel strength to be more than or equal to the steel of 140000psi.

3. the large hydrophthalmia high resistance of one according to claim 1 turns round joint of petroleum drill rod, it is characterized in that: the tapering size that connection screw thread (3) adopts is between 1:12 ~ 1:20.