CN201016290Y - Hydraulic double ram flat type oil test blowout preventer - Google Patents

Abstract

The hydraulic double ram flat type oil test blowout preventer belongs to the technical field of petroleum machinery. The oil cylinder is connected with the gate assembly through a pull rod, and the left end cover and the right end cover are respectively fixed on the two ends of the main housing outside the gate assembly, and the gate body in the gate assembly is flat. The utility model is suitable for sealing the annulus of the casing and the pipe string in operations such as oil testing and workover to prevent the occurrence of blowout accidents, and can be used as supporting equipment for formation testing tools, and can seal the annulus when the annulus is pressurized. Simple, easy to use and maintain, small in size, low in height and high in pressure, it is an ideal equipment for safe, reliable and civilized oilfield operations. The opening and closing of the blowout preventer ram is controlled by hydraulic pressure, so it not only saves labor, but also moves quickly and reliably.

Description

Hydraulic double ram flat type oil test blowout preventer

technical field

The utility model belongs to the field of blowout preventers for oil testing and workover operations in the mechanical technical field.

Background technique

At present, most of the blowout preventers used in oil testing and workover operations are circular ram blowout preventers, which are not only high in height but also very inconvenient to replace the ram on site. At present, the body of the circular ram blowout preventer used in field trials in the oil field mostly adopts the welding form of the connecting flange and the body, which has certain potential safety hazards. Users feel unsafe when using it.

Contents of the invention

The purpose of the invention of the utility model is to provide a hydraulic double ram flat type oil test blowout preventer. It aims to eliminate the design defects of the circular ram BOP by adopting a new design concept, and further improve the application function of the BOP on the basis of absorbing the advantages of the original structure, so that it can be adapted to manual, field and can be quickly disassembled and installed. plate.

The design scheme of the utility model is: a hydraulic double ram flat type oil test blowout preventer, which consists of a main casing (4), four ram assemblies (5) moving oppositely in the main casing, a hydraulic oil cylinder, a pull rod ( 7), the left end cover (1) and the right end cover (6), the hydraulic cylinder is connected with the gate assembly (5) through the tie rod (7), and the left end cover and the right end cover are respectively fixed on the main shell outside the gate assembly Both ends, the key is that the gate body in the gate assembly is flat.

The main casing (4) of the present utility model is a whole body formed by forging, and the left end cover

And the connection between the right end cover and the main shell is connected by high-strength bolts.

Compared with the background technology, the utility model has the following characteristics: 1. The flat ram structure is adopted to effectively reduce the service height; 2. Various technologies and structures are used together to improve the anti-sulfur ability. 3. The original structure ensures the connection and sealing of the shell and the end cover; 4. The built-in oil circuit is completely adopted, which is safe and reliable; 5. The working environment of the workers is greatly improved, and the use in all regions is guaranteed; 6. Adapting to environmental protection Requirements, effectively reducing operating costs.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a structural schematic diagram of the utility model.

Description of figure number:

1. Left end cover 2, lifting ring screw 3, upward indicator 4, main housing 5, gate assembly 6, right end cover 7, pull rod 8, piston 9, locking shaft 10, cylinder liner 11, right cylinder cover 12, Gasket ring 13, nameplate 14, left cylinder head 15, cap nut 16, stud 17, bolt 18, bolt 19, oil pipe seat 20, sealing joint.

Detailed ways

The structure of the utility model is shown in accompanying drawings 1 and 2, and the blowout preventer is mainly composed of a main housing (4), four gate assemblies (5) moving oppositely in the main housing, a liquid cylinder, a pull rod (7 ), screw rods, end caps and other components. When it is necessary to seal the well, start the hydraulic control system, the hydraulic oil enters the closed chamber of the blowout preventer cylinder through the closed oil circuit, and pushes the two rams to move to the center of the wellbore, relying on the joint action of the inner sealing rubber core and the outer sealing rubber core, Well sealing can be realized. When the hydraulic oil enters the opening cavity of the oil cylinder through the opening oil circuit, the oil pressure pushes the ram to move backward, and the well opening can be realized. The rubber core of the gate plate is made of rubber, and its remarkable feature is that it has large elastic deformation under the action of external force, and can evenly cling to the sealing surface to prevent leakage, and it can be restored when the external force is removed. The sealing principle of the ram is realized by using the rubber core to deform after being squeezed, and tightly hug the pipe string or cable. The blowout preventer should realize well sealing. Four seals need to work at the same time to prevent leakage, namely: between the internal seal of the ram and the pipe string, between the external seal of the ram and the shell, between the shell and the end face, and between the end cover and the tie rod.

The utility model is mainly reflected in this well to its structure:

1. The hydraulic double ram flat type oil test blowout preventer adopts a new type of flat ram body, which is an independent innovation structure. It not only simplifies the ram structure to make the installation, disassembly and maintenance of the ram body more convenient, but also greatly reduces the overall height of the oil testing blowout preventer, which provides a larger working space for the implementation of the drilling process.

2. For the first time, the hydraulic double ram flat type oil test blowout preventer adopts the integral forging of the main shell, and does not use welding process to process the main shell; the gasket ring groove on the flange is made of stainless steel surfacing and processed; and adopts special heat treatment The technology improves the mechanical performance of the whole machine; all the outer surfaces of the oil test blowout preventer adopt the nickel-phosphorus alloy plating technology, which is more anti-fouling and anti-corrosion. Through the guarantee of the above technologies, the entire blowout preventer has the performance index of preventing moderate H ₂ S corrosion.

3. The hydraulic double ram flat oil test blowout preventer adopts a sand discharge tank design at the position of the internal ram cavity, which greatly reduces the possibility of sediment and mud blocking the wellbore and reduces the failure rate of the ram to a minimum. At the same time, the sand discharge tank has the function of pressure to assist sealing, and the sealing is more reliable. The connection between the end cover and the main shell adopts high-strength bolts, and the number of bolts is minimized through finite element analysis. In addition, the original raised rubber ring sealing structure on the end face ensures the safety of the connection and makes the seal more reliable.

4. The hydraulic oil circuit system of the hydraulic double ram flat oil test preventer adopts a built-in structure completely, and there is no exposed oil circuit. Make the whole set of products more. Adopting such a scheme greatly reduces the probability of failure of the oil circuit system. And it is more convenient and faster to connect the hydraulic control source.

5. The piston rod and lead screw of the hydraulic double ram flat type oil test blowout preventer adopt a split combination structure, which makes installation and use faster and easier. It also ensures that with the help of special tools, this set of oil testing blowout preventers can realize manual forced well shut-in when a blowout occurs (when the hydraulic control system fails). For the first time, this set of oil-testing blowout preventer uses the conceptual design of the side door removal bolt, so that the whole device can be completely disassembled and installed in the field.

The blowout preventer of the utility model can specifically complete the following operations:

1. Close the annulus when there are oil pipes, drill pipes, cables or steel ropes in the well.

2. Completely seal the empty well when there is no drilling tool in the well.

3. With the wellhead closed, special operations such as well killing, well flushing, and annular pressure can be realized.

4. Used in combination with other blowout preventers to complete the operation of switching joints.

Claims (2)

1. The hydraulic double ram flat oil test blowout preventer consists of the main casing (4), four ram assemblies (5) that move oppositely in the main casing, hydraulic cylinders, pull rods (7), and the left end cover ( 1) and the right end cover (6), the hydraulic oil cylinder is connected with the gate assembly (5) through the tie rod (7), the left end cover and the right end cover are respectively fixed at both ends of the main shell outside the gate assembly, and the characteristic is The gate body in the gate assembly is flat. 2. The hydraulic double ram flat oil test blowout preventer according to claim 1, characterized in that the main casing (4) is a whole forged and formed, and the connection between the left end cover and the right end cover and the main casing adopts high Strength bolted connections.

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