CN1869399B - Shock-absorbing connection - Google Patents

Abstract

A shock-absorbing joint, including a connecting seat, a shock-absorbing joint body, a rubber body, a socket port, a connection fixing hole and a glue injection hole, the shock-absorbing joint injects rubber between the connecting seat and the shock-absorbing joint body, and There is a boss that cooperates with the shock absorbing joint body to improve the mechanical strength of the rubber body, which not only relies on the elasticity of the rubber body to achieve the purpose of shock absorption, but also prevents the rubber body from breaking due to deformation and the mechanical position of the measuring pup joint. It overcomes the shortcomings of the existing shock-absorbing joints that easily cause measurement errors in the measuring instrument and that the rubber body is easily broken due to strong vibrations. It can not only achieve the shock-absorbing effect, but also work reliably in the well. It is suitable for use in oil drilling projects. Connection to wireless measurement-while-drilling instruments.

Description

Shock absorbing joint

Technical field:

The invention relates to a shock-absorbing joint used for a wireless measuring-while-drilling instrument in petroleum drilling engineering.

Background technique:

At present, in the field of measurement-while-drilling in the oil drilling industry, wireless measurement-while-drilling instruments are usually composed of multiple measurement sub-sections connected by coupling connectors to complete the measurement of parameters such as well deviation, azimuth, gamma, and resistivity. The reliability of the connection plays a very important role in the normal operation of the instrument when working under the condition of strong vibration and shock in the well. Since the coupling connector generally has no shock-absorbing effect, it is necessary to install a shock-absorbing joint between the coupling connector and the measuring nipple, relying on the shock-absorbing effect of the shock-absorbing joint, so that the downhole instrument can avoid strong vibration and impact, so the shock absorber The shock absorption effect and reliability of the shock joint has become an important part of the wireless measurement while drilling instrument, which directly affects the measurement accuracy and reliability of the instrument. The two ends of the known coupling shock-absorbing joint are metal connectors, with wiring sockets on it, and a section of rubber body with wire holes in the middle. The body is used for shock absorption, so that the instrument will not be subjected to strong strong vibration and impact when working in the downhole. This coupling shock-absorbing joint can achieve the purpose of shock absorption by relying on the elasticity of rubber, but it has the following disadvantages:

First of all, it is easy to cause position deviation between the lower measuring sub and the upper drilling tool, resulting in measurement errors. Although this kind of coupling shock-absorbing joint relies on the elasticity of rubber to achieve the purpose of shock absorption, due to the long length of the downhole measuring sub-joint connected together, the lower measuring sub-joint will be subjected to the gravity and the elastic deformation of the rubber body itself to move downward. In addition, when the downhole drilling tool rotates, due to the elastic effect of the rubber body, a twisted deflection angle will be generated between the lower measuring nipple and the upper drilling tool, and the deflection angle will make the measuring short The output signal of the well inclination sensor in the joint cannot truly reflect the attitude of the drilling tool, and the deviation of the mechanical position of these two deviations will cause measurement errors.

Secondly, the rubber body is easy to break due to strong vibration. Since the two ends of this coupling shock-absorbing joint are metal connecting bodies, only a section of rubber body is used for shock-absorbing connection in the middle. Since the instrument works under the condition of strong vibration and impact underground, it is easy to make the rubber under repeated vibration and impact. Fatigue, aging and fracture, once fracture occurs, the measuring sub-joint at the lower part will not work, and to avoid this situation, it is necessary to regularly test the fatigue index of the rubber body, or directly replace it regularly, the former is in the specific implementation There are greater difficulties, and the latter will inevitably lead to an increase in the cost of using the instrument.

Invention content:

The purpose of the present invention is to provide a shock absorbing joint for wireless measuring instruments while drilling in oil drilling engineering. Compared with the prior art, the shock absorbing joint overcomes the problem that the existing shock absorbing joints easily cause measuring errors in the measuring instruments and The disadvantage that the rubber body is easily broken due to strong vibration can not only achieve the shock absorption effect, but also work reliably in the underground.

The shock-absorbing joint of the present invention includes a connecting seat, a shock-absorbing joint body, a rubber body, a socket port, a connection fixing hole and a glue injection hole, and is characterized in that the top of the connecting seat is processed into a flange-shaped disc, and the surrounding area of the disc is There is a groove, a disc is processed in the middle and upper part, a circular body is formed between the two discs, the lower part is processed into a cylinder, a boss is left on the cylinder, a groove is dug in the boss, and a through hole is processed in the center of the connecting seat , the shock-absorbing joint body is a cylindrical cylinder, and a boss is processed in the cylinder, and a groove matching the boss in the cylinder of the connecting seat is dug in the boss, and the lower part is processed into a semicircle, and the socket port and the connection The fixing hole, the connecting seat is inserted into the shock-absorbing joint body, and the rubber body is injected to fix it. A hole is drilled on one side of the damping joint body, a groove is processed symmetrically on the upper end surface, and a hole leading to the cylinder body is processed axially on the lower semicircular body.

The beneficial effect of the shock-absorbing joint of the present invention is that rubber is injected between the connection seat and the shock-absorbing joint body, and there are mutually matching bosses between the connection seat and the shock-absorbing joint body, which are used to improve The mechanical strength of the rubber body not only relies on the elasticity of the rubber body to achieve the purpose of shock absorption, but also does not cause the rubber body to break due to deformation and produce a change in the mechanical position of the measuring pup joint, which overcomes the existing shock-absorbing joints that easily cause measurement errors in the measuring instrument and the The disadvantage that the rubber body is easily broken due to strong vibration can not only achieve the shock absorption effect, but also work reliably in the underground.

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Description of drawings:

Figure 1 shows a cross-sectional view of the "shock absorbing joint".

1. Connecting seat 2. Shock absorbing joint body 3. Rubber body

4. Socket 5. Connection fixing hole 6. Glue injection hole

Detailed ways:

Now in conjunction with the accompanying drawings of the description, the present invention will be further described.

Figure 1 shows a sectional view showing a damper joint. The top of the connection seat 1 is processed into a flange-shaped disc with grooves around the disc, a disc is processed in the middle and upper part, a circular body is formed between the two discs, and the lower part is processed into a cylinder with convex holes. There is a groove dug in the boss, and a through hole is also processed in the center of the connecting seat 1. The shock-absorbing joint body 2 is a cylindrical cylinder, and a boss is processed in the cylinder. Cooperate groove, bottom is processed into semicircle, has socket mouth 4 and connection fixing hole 5 on the semicircle. One side of the damping joint body 2 is drilled with a glue injection hole 6, a groove is symmetrically processed on the upper end surface, and a hole leading to the cylinder body is axially processed on the lower semicircular body.

When the shock-absorbing joint is assembled, the connecting seat 1 is inserted into the shock-absorbing joint body 2, and rubber is injected into the gap between the connecting seat 1 and the shock-absorbing joint body 2 through the injection hole 6 on the side of the shock-absorbing joint body 2 to form a rubber body 3. Since there are cooperating bosses between the connecting seat 1 and the shock-absorbing joint body 2, the mechanical strength of the rubber body can be improved, which not only relies on the elasticity of the rubber body to achieve the purpose of shock absorption, but also prevents the rubber body from breaking due to deformation and causing damage. Measuring the change of the mechanical position of the pup joint overcomes the shortcomings of the existing shock-absorbing joints that are prone to measurement errors and the rubber body is easily broken due to strong vibrations. It can not only achieve the shock-absorbing effect, but also work reliably underground.

The connection line socket is fixed on the socket port 4 on the semicircular body of the shock-absorbing joint body 2 bottom by screws, and the lead-out line of the socket is led to the coupling connector through the through hole at the center of the connection seat 1 .

When the instruments are connected, the grooves around the disc on the top of the connection base 1 are aligned with the screw installation holes on the coupling connector, and the connection fixing holes 5 are aligned with the installation holes on the upper connection device of the measuring pup joint. Since the top of the connection base 1 The diameter of the circle diameter body between the two disks in the middle and upper part is smaller than the diameter of the disk, so it is convenient to fix the shock absorbing joint and the coupling connector together by screws. In addition, the screws are installed in the connection fixing hole 5, and the shock absorbing joint and the coupling connector are fixed together. The measuring subs are fastened together.

Claims (2)

1. A shock-absorbing joint, comprising: a connection seat (1), a shock-absorbing joint body (2), a rubber body (3), a socket port (4), a connection fixing hole (5) and a glue injection hole (6), It is characterized in that the top of the connection seat (1) is processed into a flange-shaped disc, and there are grooves around the disc, a disc is processed in the middle and upper part, a diameter body is formed between the two discs, and the lower part is processed into a cylinder. There is a boss on the body, a groove is dug in the boss, and a through hole is processed in the center of the connecting seat (1). The connecting seat (1) is a groove for matching the boss in the cylinder, and the lower part is processed into a semicircular body, and the semicircular body is provided with a socket port (4) and a connection fixing hole (5), and the connecting seat (1) is inserted into the shock-absorbing joint body ( 2), and inject the rubber body (3) to fix it. 2. The shock-absorbing joint according to claim 1, characterized in that one side of the shock-absorbing joint body (2) is drilled with a glue injection hole (6), the upper end face is symmetrically processed with a groove, and the lower semicircular body is axially processed with a groove Hole leading to cylindrical barrel.

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