CN209244539U - Test Heads for Bypass Valves for Continuous Circulation Drilling - Google Patents

Abstract

The utility model discloses a pressure test head of a bypass valve for continuous circulation drilling, which is installed on the valve seat of the bypass valve of the continuous circulation nipple, and the lower end can be opened and closed by the valve plate of the bypass valve; comprising: a body , bolts, springs and nuts; the body is provided with a through hole along the axial direction, and the through hole is divided into the first section, the second section and the third section from top to bottom, the first section is cylindrical or prismatic, and is used for tools. ; The diameter of the second section is smaller than the third section; the bolt is installed in the through hole, and its head is stuck at the connection between the first section and the second section, and the screw rod passes through the second section and enters the third section; and the head of the bolt is in line with the A gap is formed between the side walls of the first section; the spring is installed in the third section of the through hole and sleeved on the outside of the screw rod of the bolt; the nut is screwed on the lower end of the bolt. The pressure test head has a simple structure and few parts, and realizes the pressure test function of the bypass valve for continuous circulation drilling simply and quickly.

Description

Test Heads for Bypass Valves for Continuous Circulation Drilling

technical field

The utility model relates to the field of oil drilling equipment, in particular to a pressure test head for a bypass valve for continuous circulation drilling.

Background technique

Continuous circulation drilling can realize the continuous injection of drilling circulation medium into the drill string through the bypass pipeline when connecting a single root, column and tripping, maintain a constant drilling circulation displacement and equivalent density, and prevent the circulation from stopping when connecting and unloading a single root or column Accidents such as well wall collapse, overflow, sand sinking and sticking caused by complex accidents occur, and the key to establishing a bypass pipeline is the bypass valve on the continuous circulation nipple. The sealing quality of the bypass valve directly affects whether the continuous circulation Smooth progress and the safety of construction workers. During construction, the continuous circulation nipple sits behind the wellhead, removes the valve plug on the outside of the bypass valve, that is, the pressure test head, and then connects the bypass pipeline. If the bypass valve leaks, the construction personnel will be injured if the valve plug is removed hastily.

CN 201210561458.5 provides a valve plug structure for a bypass valve, in which a valve core and a pressure relief valve are nested. Vibration and other dynamic loads will fall off and fall into the well.

CN 201320567645.4 provides another valve plug structure for bypass valves. Although there is a retaining ring to prevent small parts from falling off, it is difficult to process the L-shaped pressure relief hole, and there are solids contained in the drilling fluid in the small hole in the front section of the valve plug. Particles may be blocked, so that the pressure test function before unblocking the valve cannot be achieved.

Contents of the invention

In order to solve the above-mentioned technical problems, the utility model provides a pressure test head for a bypass valve for continuous circulation drilling.

For this reason, the technical scheme of the utility model is as follows:

A pressure test head of a bypass valve for continuous circulation drilling, which is installed on the valve seat of the bypass valve of the continuous circulation nipple, and the lower end can be opened and closed by the valve plate of the bypass valve; it includes: a body, bolts, springs and nut;

The body is provided with a through hole in the axial direction, and the through hole is divided into a first section, a second section and a third section from top to bottom, and the first section is cylindrical or prismatic, and is a tool hole; said second segment has a smaller diameter than the third segment;

The bolt is installed in the through hole, the head of which is stuck at the junction of the first section and the second section, and the screw rod passes through the second section and enters the third section; and the head of the bolt is connected to the first section A gap is formed between the side walls of the

The spring is installed in the third section of the through hole and sleeved on the outside of the screw rod of the bolt;

The nut is screwed on the lower end of the bolt.

Further, the first section of the through hole is in the shape of a hexagonal prism or a quadrangular prism.

Further, the spring is a conical spring.

Further, the cross section of the bolt head is hexagonal, quadrangular, triangular, pentagonal, heptagonal or octagonal.

The product has the following beneficial effects:

(1) The structure of the pressure test head is simple, and it will not fall off and fall into the well under the harsh working conditions of the underground.

(2) When there is no pressure inside the pressure test head, close the middle channel of the body to prevent the intrusion of external drilling fluid.

(3) When the seal between the valve seat and the valve plate fails, the pressure test head releases the pressure intermittently and sprays around the tool hole, which is highly safe.

(4) The pressure can be judged according to the intermittent pressure relief frequency.

Description of drawings

Fig. 1 is the sectional view of the pressure test head of the bypass valve for continuous circulation drilling provided by the utility model;

Fig. 2 is a sectional view of the use state of the pressure test head of the bypass valve for continuous circulation drilling provided by the utility model.

Detailed ways

The technical solution of the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, a pressure test head of a bypass valve for continuous circulation drilling is installed on the valve seat 6 of the bypass valve of the continuous circulation nipple, and the lower end can be opened and closed by the valve plate 7 of the bypass valve; Including: body 1, bolt 2, spring 3 and nut 4;

The main body is provided with a through hole along the axial direction. The through hole is divided into the first section, the second section and the third section from top to bottom. The first section is cylindrical or prism-shaped and is a hole for tools; third paragraph;

The bolt 2 is installed in the through hole, and its head is stuck at the junction of the first section and the second section, and the screw rod passes through the second section and enters the third section; and a bolt is formed between the head of the bolt and the side wall of the first section gap;

The spring 3 is installed in the third section of the through hole, and is set on the outside of the screw rod of the bolt 2; preferably, the spring 3 is a conical spring;

The nut 4 is screwed on the lower end of the bolt 2 .

As an embodiment of the present invention, the first section of the through hole is in the shape of a hexagonal prism or a quadrangular prism.

As an embodiment of the present invention, the cross section of the head of the bolt 2 may be hexagonal, quadrangular, triangular, pentagonal, heptagonal or octagonal.

As shown in Figure 2, when in use, the test pressure head is installed on the valve seat 6 of the bypass valve of the continuous cycle joint, and the lower end can be opened and closed by the valve plate 7 of the bypass valve; when the valve seat 6 and the valve plate 7 When the seal between them is good, the fluid pressure inside the valve plate 7 will not enter between the valve plate 7 and the pressure test head, and the bolt 2 is pressed tightly on the step of the test pressure head body 1 under the action of the spring 3 to prevent Annulus drilling fluid enters the inside of the pressure test head to ensure internal cleanliness.

When the seal between the valve seat 6 and the valve plate 7 fails, the fluid pressure inside the valve plate 7 will enter between the valve plate 7 and the pressure test head, and this pressure acts on the bolt 2, which is compressed by the nut 4 that is threaded. The spring 3 moves to the outside, so that the inside of the pressure test head communicates with the outside of the tool hole 5, and the fluid inside the pressure test head flows outward. Under the obstruction of the bolt 2, the fluid is sprayed around the tool hole 5. , the pressure difference between the inner and outer sides of the bolt 2 becomes smaller, and the bolt 2 resets under the action of the spring 3 to close the fluid outflow channel. Then the pressure inside the bolt 2 rises, and the bolt 2 is pushed to move outward again, release pressure, reset, and reciprocate.

Insert the disassembly tool into the tool hole 5, install the pressure test head in the bypass valve, and enter the well with the whole tool. When the bypass pipeline needs to be connected, check whether the bolt 2 will release the pressure intermittently. If not, you can use the removal tool to insert the tool hole 5 to remove the pressure test head; if there is pressure release, you can judge whether to terminate the continuous cycle according to the pressure release frequency job, and then process it.

Claims (4)

1. a kind of pressure text head of continuous cyclic drilling by-passing valve, is mounted on the valve seat (6) of the by-passing valve of continuous circulating sub, The valve plate (7) of the bypassed valve of lower end energy controls opening and closing；It is characterised by comprising: ontology (1), bolt (2), spring (3) and nut (4)；

Along being axially arranged with through-hole, the through-hole is divided into first segment, second segment and third section from top to bottom for the ontology, and described first The cylindrical or prism-shaped of section uses hole for tool；The diameter of the second segment is less than third section；

The bolt (2) is mounted in the through-hole, and the head is stuck in the junction of first segment and second segment, and screw rod passes through second Section enters third section；And gap is formed between the head of the bolt and the side wall of the first segment；

The spring (3) is mounted in the third section of the through-hole, covers in the outside of the screw rod of the bolt (2)；

The nut (4) is screwed onto the lower end of the bolt (2).

2. pressure text head as described in claim 1, it is characterised in that: the first segment of the through-hole is in hexa-prism or quadrangular shape.

3. pressure text head as described in claim 1, it is characterised in that: the spring (3) is volute spring.

4. pressure text head as described in claim 1, it is characterised in that: the cross section that bolt (2) head is is hexagon, four sides Property, triangle, pentagon, heptagon or octagon.