Watertight hollow joint applied to top drive drilling machine

Abstract

The utility model belongs to the technical field of top drive drilling machines, and particularly relates to a watertight hollow joint applied to a top drive drilling machine, which comprises a top drive horn mouth and a double-layer watertight bearing, the double-layer watertight bearing is mounted at an opening of the top drive horn mouth, and a hollow cylinder is welded on an inner ring of the double-layer watertight bearing. A hollow cylindrical plug is placed at the upper end of the cylinder, the lower end of the hollow cylindrical plug is located in the cylinder, the upper end of the hollow cylindrical plug extends out of the cylinder, an outer sleeve located outside the cylinder is installed at the top end of the cylinder, the outer sleeve covers the upper end of the hollow cylindrical plug, and the upper end of the hollow cylindrical plug abuts against the inner wall of the outer sleeve. According to the double-layer watertight bearing, a top drive drilling machine can conduct normal drilling construction under the condition that a tool cannot be taken out, the watertight function is achieved by welding the lower portion of the double-layer watertight bearing and a horn mouth of the drilling machine, and a hollow cylindrical plug is compacted by a cylinder on the upper portion of the double-layer watertight bearing and an outer sleeve in a threaded connection mode. And the watertight function is also realized.

Description

TECHNICAL FIELD

[0001] The utility model belongs to top drive drilling rig technical field especially relates to a watertight hollow joint for top drive drilling rig. BACKGROUND

[0002] Downhole static sounding is an important method of in-situ testing, which is a kind of in-situ testing method that uses CPT winch to put the penetration tool with static sounding probe into the drill pipe connected with the top drive drilling rig horn mouth, and then collects static sounding data. This method can collect static sounding data in segments, and the operation is not limited by the depth of the stratum and the thickness of the sand layer. Since the static sounding tool cannot be retrieved by the pulling force of the winch after penetration, the probe in the stratum needs to be pulled out of the stratum by the lifting system of the top drive drilling rig, so the top drive drilling rig needs to be lifted after the static sounding penetration is completed. When the construction stratum is a large-grained sandy stratum, the top drive cannot be lowered to the original position after the drill bit is lifted, which causes the CPT tool to be unable to be taken out of the top drive drilling rig.

[0003] The utility model discloses a watertight hollow joint applied to top drive drilling rig solves the above -mentioned problem. CONTENT OF THE UTILITY MODEL

[0004] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0005] A watertight hollow joint applied to top drive drilling rig, it includes top drive horn mouth and double layer watertight bearing, double layer watertight bearing installs at the opening of top drive horn mouth, and the inner ring of double layer watertight bearing is welded with hollow cylinder barrel, and the upper end of cylinder barrel is placed with hollow cylinder plug, and the lower end of hollow cylinder plug is located in the inside of cylinder barrel, and the upper end of hollow cylinder plug extends to the outside of cylinder barrel, and the top end of cylinder barrel is installed with the outer sleeve located in the outside of cylinder barrel, and the outer sleeve is covered on the upper end of hollow cylinder plug, and the upper end of hollow cylinder plug is in abutment with the inner wall of outer sleeve.

[0006] As a preferred scheme, the outer ring of double layer watertight bearing is welded and fixed with top drive horn mouth.

[0007] As a preferred scheme, the outer sleeve is fixed between cylinder barrel through the mode of screw thread connection.

[0008] As a preferred scheme, the inner diameter of the opening above outer sleeve is less than the inner diameter of cylinder barrel.

[0009] As a preferred scheme, the upper end diameter of hollow cylinder plug is greater than the lower end diameter, and hollow cylinder plug is of rubber material.

[0010] Compared with the prior art, the utility model has the advantages of:

[0011] 1. The double-layer watertight bearing of this utility model enables the top drive drilling rig to carry out normal drilling operations under conditions where tools cannot be removed. The watertight function is achieved by welding the lower part of the double-layer watertight bearing to the flared mouth of the drilling rig. The upper cylindrical tube and the outer sleeve of the double-layer watertight bearing are connected by threads to compact the hollow cylindrical plug, which also achieves the watertight function.

[0012] 2. The hollow cylindrical plug of this utility model is made of rubber, and the inner wall of the hollow cylindrical plug can better fit with the outer layer of the high-strength rubber PCPT cable. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the present invention.

[0014] The labels in the diagram are as follows: 1. Top drive bell mouth; 2. Double-layer watertight bearing; 3. Cylindrical tube; 4. Hollow cylindrical plug; 5. Outer sleeve. Detailed Implementation

[0015] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following embodiments or drawings are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0016] A watertight hollow joint for use in top drive drilling rigs, such as Figure 1 As shown, it includes a top drive horn mouth 1 and a double-layer watertight bearing 2. The double-layer watertight bearing 2 is installed at the opening of the top drive horn mouth 1. The outer ring of the double-layer watertight bearing 2 is welded and fixed to the top drive horn mouth 1. A hollow cylindrical tube 3 is welded to the inner ring of the double-layer watertight bearing 2.

[0017] A hollow cylindrical plug 4 is placed at the upper end of the cylindrical tube 3. The lower end of the hollow cylindrical plug 4 is located inside the cylindrical tube 3, and the upper end of the hollow cylindrical plug 4 extends to the outside of the cylindrical tube 3. An outer sleeve 5 is installed at the top of the cylindrical tube 3, which is located outside the cylindrical tube 3. The outer sleeve 5 covers the upper end of the hollow cylindrical plug 4. The upper end of the hollow cylindrical plug 4 abuts against the inner wall of the outer sleeve 5. The inner diameter of the upper opening of the outer sleeve 5 is smaller than the inner diameter of the cylindrical tube 3. The upper diameter of the hollow cylindrical plug 4 is larger than the lower diameter, and the lower diameter of the hollow cylindrical plug 4 is smaller than the inner diameter of the cylindrical tube 3. The hollow cylindrical plug 4 is made of rubber.

[0018] Usage steps:

[0019] 1. Install the assembled double-layer watertight bearing 2, cylindrical tube 3 and outer sleeve 5 at the top drive flared mouth 1;

[0020] 2. When using a watertight hollow connector, unscrew the outer sleeve 5 from the cylindrical tube 3 and pass the PCPT cable through the hollow cylindrical plug 4;

[0021] 3, hollow cylindrical plug 4 is placed on the cylinder 3, hollow cylindrical plug 4 is placed in the cylinder 3, the outer sleeve 5 is screwed on the cylinder 3, the outer sleeve 5 presses the hollow cylindrical plug 4 on the cylinder 3;

[0022] 4, after the completion of the connection operation, start the mud pump of the top drive drilling machine, check whether there is water leakage phenomenon in the water-tight joint;

[0023] 5, normally use the top drive drilling machine, after reaching the target horizon, the outer sleeve 5 is removed from the cylinder 3, the hollow cylindrical plug 4 is taken out, and the single use is finished.

[0024] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification or equivalent change made according to the technical essence of the present application to the above embodiment falls within the protection scope of the present application.

Claims

1. A water-tight hollow sub for use on a top drive drilling rig, characterized by: The top drive trumpet mouth (1) and the double-layer water-tight bearing (2) are included, the double-layer water-tight bearing (2) is installed at the opening of the top drive trumpet mouth (1), the hollow cylindrical barrel (3) is welded on the inner ring of the double-layer water-tight bearing (2), the hollow cylindrical plug (4) is placed on the upper end of the cylindrical barrel (3), the lower end of the hollow cylindrical plug (4) is located inside the cylindrical barrel (3), the upper end of the hollow cylindrical plug (4) extends to the outside of the cylindrical barrel (3), the outer sleeve (5) located outside the cylindrical barrel (3) is installed on the top end of the cylindrical barrel (3), the outer sleeve (5) covers the upper end of the hollow cylindrical plug (4), and the upper end of the hollow cylindrical plug (4) abuts against the inner wall of the outer sleeve (5).

2. A water tight hollow sub for use in a top drive drilling rig as claimed in claim 1, characterized in that: The outer ring of the double-layer water-tight bearing (2) is welded and fixed with the top drive trumpet mouth (1).

3. A water tight hollow sub as claimed in claim 1, wherein: The outer sleeve (5) and the cylindrical barrel (3) are fixed by thread connection.

4. A water tight hollow sub as claimed in claim 1, wherein: The inner diameter of the opening above the outer sleeve (5) is smaller than the inner diameter of the cylindrical barrel (3).

5. A water tight hollow sub for use in a top drive drilling rig as claimed in claim 4, characterised in that: The upper end of the hollow cylindrical plug (4) is larger in diameter than the lower end, and the hollow cylindrical plug (4) is made of rubber.

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