CN110630188B

CN110630188B - Double-gradient well drilling air inflation connector for air inflation of marine riser

Info

Publication number: CN110630188B
Application number: CN201910970034.6A
Authority: CN
Inventors: 敬俊; 祝效华; 汤历平; 王成涛
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2019-10-12
Filing date: 2019-10-12
Publication date: 2021-04-20
Anticipated expiration: 2039-10-12
Also published as: CN110630188A

Abstract

The invention discloses a riser inflation double-gradient well drilling inflation joint which mainly comprises a joint main body, a joint shell, a small filter plate, an upper sealing ring, a spring, a lower sealing ring, a base, a large filter plate, a large clamp spring, a sealing ring, a small clamp spring and a set screw, and is characterized in that the joint main body, the joint shell, the upper sealing ring and the lower sealing ring form two fluid pressure cavities E and F, and when inflation operation is carried out, an inflation hole is opened under the pressure action of high-pressure gas, so that the high-pressure gas is injected into drilling fluid; when the air inflation operation is completed, the air compressor is closed, the pressure of the cavity E is reduced, the upper sealing ring resets to seal the inflation hole, if drilling fluid flows backwards, the pressure of the cavity E and the pressure of the cavity F are equal to the pressure of the drilling fluid, the upper sealing ring resets under the action of the elastic force of the spring to seal the inflation hole, and the drilling fluid is prevented from flowing backwards. The high-pressure gas injection device is simple in structure and can ensure that high-pressure gas can be safely and stably injected into drilling fluid.

Description

Double-gradient well drilling air inflation connector for air inflation of marine riser

Technical Field

The invention relates to a petroleum drilling tool, in particular to a riser inflation double-gradient drilling inflation joint, belonging to the technical field of mechanical engineering or oil-gas engineering.

Background

The exploration and development technology of petroleum and natural gas is continuously developed, and the current development situation of oil and gas all over the world is changed from an original main exploitation block to a block with complex stratum conditions and poor oil and gas storage physical properties. Particularly, when oil and gas are exploited from deep sea strata, the safety density window is too narrow, so that the bottom hole pressure is difficult to control and maintain in the safety density window, and well drilling accidents such as well leakage, overflow and the like are caused. The use of conventional methods of adding casing increases drilling costs and construction difficulties.

For the problem of deep sea drilling, a double-gradient drilling technology is mostly adopted to solve the problem at present, a riser inflation double-gradient drilling technology is one of the double-gradient drilling technologies, the density of drilling fluid from a seabed mud line to a drilling platform is changed by injecting gas into a riser annular space so as to control the pressure balance at the bottom of a well, when the gas is injected into a riser, an inflation connector is required to be used to ensure that high-pressure gas can be safely and stably injected into the drilling fluid, and the domestic prior art is not related to the inflation connector introduction, so that the invention of the riser inflation double-gradient drilling inflation connector has important significance for realizing deep sea oil and gas exploitation of riser inflation double-gradient drilling.

Disclosure of Invention

The invention aims to overcome the difficulty that high-pressure gas is difficult to be injected into a riser annulus, and provides a riser gas-filled dual-gradient drilling gas-filled joint, which can ensure that the high-pressure gas can be safely and stably injected into the riser annulus.

The technical scheme adopted by the invention is as follows:

the utility model provides a double gradient well drilling gas filled joint is aerifyd to marine riser mainly comprises joint main part, joint shell, little filter plate, upper seal ring, spring, lower sealing ring, base, big filter plate, big jump ring, sealing washer, little jump ring and holding screw, its characterized in that: the connector main body is formed by welding an upper flange connector, an inflation cavity and a lower flange connector, and ten inflation holes, one liquid outlet hole and one fastening screw hole are uniformly distributed in the circumferential direction of the inflation cavity; the joint shell is fixed on the joint main body through threaded connection and is prevented from rotating along the circumferential direction to be tripped through fixing of a set screw, and an inflation pipeline joint is welded on the joint shell and is provided with a set screw auxiliary hole; the inflation pipeline joint comprises a front flange, a rear flange, a clamping sleeve, a T-shaped sealing ring, an inner sealing ring and an outer sealing ring, wherein the front flange and the rear flange are provided with inner holes along the axial direction, and the front flange and the rear flange which are butted are fixedly held tightly through the clamping sleeve, a bolt and a nut; the upper sealing ring is assembled at the upper part of the joint main body to seal the inflation hole, and the lower sealing ring is assembled at the lower part of the joint main body and limits the axial movement of the joint main body through the base; the spring is assembled between the upper sealing ring and the lower sealing ring and plays a role in supporting the upper sealing ring; the base is fixed with the joint shell through threads; the small filter plate and the large filter plate are fixed on the gas charging hole and the liquid discharging hole through the small snap spring and the large snap spring, and the functions of filtering drilling fluid and preventing rock debris from blocking the gas charging hole and the liquid discharging hole are achieved. Compared with the prior art, the invention has the beneficial effects that: (1) this application one kind is aerifyd and is connected through being provided with a plurality of along the circumferencial direction equipartitions and aerify the hole, guarantees the misce bene of gas and drilling fluid. (2) The utility model provides an inflation joint passes through spring and pressure chamber, plays the effect of single current valve, prevents the drilling fluid refluence.

Drawings

FIG. 1 is a schematic diagram of a riser inflatable dual gradient drilling inflation joint;

FIG. 2 is a schematic structural view of the fitting body;

FIG. 3 is a schematic structural view of a joint housing;

FIG. 4 is a schematic structural view of a gas line connector;

in the figure: 1. the connector comprises a connector main body, a flange upper connector, an inflation hole, a flange lower connector, a flange upper connector, a flange inflation cavity, a flange inflation lower connector, a flange liquid outlet, a flange fastening screw hole, a connector shell, a connector inflation pipeline connector 2a1. front flange, a flange 2a2 rear flange, a 2a3. clamping sleeve, a 2a 4T-shaped sealing ring, a 2a5. inner sealing ring, a 2a6. outer sealing ring, a fastening screw auxiliary hole, a small filter plate, a4 upper sealing ring, a spring, a6 lower sealing ring, a 7 base, a 8 large filter plate, a 9 large clamping spring, a 10 sealing ring, a 11 small clamping spring and a 12 fastening screw.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1-4, a double gradient well drilling gas-filled joint is aerifyd to marine riser mainly comprises joint main part 1, joint shell 2, little filter plate 3, upper seal ring 4, spring 5, lower seal ring 6, base 7, big filter plate 8, big jump ring 9, sealing washer 10, little jump ring 11 and holding screw 12, its characterized in that: the connector main body 1 is formed by welding an upper flange connector 1a, an inflation cavity 1c and a lower flange connector 1d, and ten inflation holes 1b, a liquid outlet hole 1e and a fastening screw hole 1f are uniformly distributed in the circumferential direction of the inflation cavity 1 c; the joint shell 2 is fixed on the joint main body 1 through threaded connection and is fixed through a set screw 12 to prevent the joint shell from rotating along the circumferential direction to be tripped, and an inflation pipeline joint 2a is welded on the joint shell and is provided with a set screw auxiliary hole 2 b; the inflation pipeline joint 2a comprises a front flange 2a1, a rear flange 2a2, a clamping sleeve 2a3, a T-shaped sealing ring 2a4, an inner sealing ring 2a5 and an outer sealing ring 2a6, wherein the front flange 2a1 and the rear flange 2a2 are provided with inner holes along the axial direction, and the butted front flange 2a1 and the butted rear flange 2a2 are fixedly and tightly held through the clamping sleeve 2a3 and bolts and nuts; the upper sealing ring 4 is assembled at the upper part of the joint main body 1 to seal the inflation hole 1b, and the lower sealing ring 6 is assembled at the lower part of the joint main body 1 and limits the axial movement of the joint main body through the base 7; the spring 5 is assembled between the upper sealing ring 4 and the lower sealing ring 6 and plays a role in supporting the upper sealing ring 4; the base 7 is fixed with the joint shell 2 through threads; the small filter plate 3 and the large filter plate 8 are fixed on the gas charging hole 1b and the liquid discharging hole 1e through the small snap spring 11 and the large snap spring 9, and play a role in filtering drilling fluid and preventing rock debris from blocking the gas charging hole 1b and the liquid discharging hole 1e. When the air inflation operation is carried out, high-pressure air enters the cavity E, and when the pressure of the cavity E is greater than that of the cavity F, the upper sealing ring 4 is pushed to move downwards under the action of the air pressure, so that the high-pressure air enters the drilling fluid through the air inflation holes 1b uniformly distributed on the connector main body 1; when the inflation operation is completed, the air compressor is closed, the pressure of the cavity E is reduced, the upper sealing ring 4 resets under the action of the fluid pressure of the cavity F and the elastic force of the spring 5, the inflation hole 1b is sealed, if drilling fluid flows backwards, the pressure of the cavity E and the pressure of the cavity F are equal to the pressure of the drilling fluid, the upper sealing ring 4 resets under the action of the elastic force of the spring 5, the inflation hole 1b is sealed, and the drilling fluid is prevented from flowing backwards.

The above-described embodiments are intended to be illustrative of the present patent and not to limit the scope of the patent, and any equivalent changes and modifications that may be made by one skilled in the art without departing from the spirit and principles of the patent are intended to be covered by the present patent system.

Claims

1. The utility model provides a double gradient well drilling gas charging connection is aerifyd to marine riser mainly comprises joint main part (1), joint shell (2), little filter plate (3), upper seal ring (4), spring (5), lower sealing ring (6), base (7), big filter plate (8), big jump ring (9), sealing washer (10), little jump ring (11) and holding screw (12), its characterized in that: the connector main body (1) is formed by welding an upper flange connector (1a), an inflation cavity (1c) and a lower flange connector (1d), and ten inflation holes (1b), a liquid outlet hole (1e) and a fastening screw hole (1f) are uniformly distributed in the circumferential direction of the inflation cavity (1 c); the joint shell (2) is fixed on the joint main body (1) through threaded connection and is prevented from rotating along the circumferential direction to be tripped through a set screw (12), and an inflation pipeline joint (2a) is welded on the joint shell and is provided with a set screw auxiliary hole (2 b); the inflation pipeline joint (2a) comprises a front flange (2a1), a rear flange (2a2), a clamping sleeve (2a3), a T-shaped sealing ring (2a4), an inner sealing ring (2a5) and an outer sealing ring (2a6), wherein the front flange (2a1) and the rear flange (2a2) are provided with inner holes along the axial direction, and the butted front flange (2a1) and the rear flange (2a2) are fixedly and tightly held through the clamping sleeve (2a3) and a bolt nut; the upper sealing ring (4) is assembled at the upper part of the joint main body (1) to seal the inflation hole (1b), and the lower sealing ring (6) is assembled at the lower part of the joint main body (1) and limits the axial movement of the joint main body through the base (7); the spring (5) is assembled between the upper sealing ring (4) and the lower sealing ring (6) and plays a supporting role on the upper sealing ring (4); the base (7) is fixed with the joint shell (2) through threads; the small filter plate (3) and the large filter plate (8) are fixed on the gas charging hole (1b) and the liquid discharging hole (1e) through the small clamp spring (11) and the large clamp spring (9), so that the drilling fluid is filtered, and the rock debris is prevented from blocking the gas charging hole (1b) and the liquid discharging hole (1 e).

2. A riser inflatable dual gradient drilling inflation joint according to claim 1, wherein the joint body (1), the joint housing (2), the upper sealing ring (4) and the lower sealing ring (6) form two fluid pressure chambers E and F; when the air inflation work is not carried out, the pressure of the F cavity is equal to the pressure of the drilling fluid in the air inflation connector and is greater than the pressure in the E cavity, and at the moment, the upper sealing ring (4) seals the air inflation hole (1b) under the action of the pressure of the F cavity and the elastic force of the spring (5) to prevent the drilling fluid from flowing into the air inflation pipeline; when carrying out the work of aerifing, when the elasticity of the pressure in chamber E is greater than chamber F and spring, go up sealing ring (4) downstream, aerify hole (1b) and open, aerify the work, treat after aerifing the work, close air compressor, the pressure reduction of chamber E, go up sealing ring (4) and reset, will aerify hole (1b) and seal, if there is the drilling fluid refluence, the pressure of chamber E and chamber F all equals drilling fluid pressure force this moment, under the effect of spring (5) elasticity, go up sealing ring (4) and reset, seal hole (1b), prevent the drilling fluid refluence.