CN203022647U - Casing grouting circulating joint - Google Patents

Abstract

The utility model relates to a casing grouting circulating joint. The circulating joint consists of a casing nipple, a male union head, an annular iron plate, an exhaust pipeline and a female union head. Standard casing threads are processed on the lower part of a casing short section and directly connected with a coupling on the top of a casing column, the male union head is connected with a liquid inlet pipeline through threads and laterally and integrally welded on the casing short section, the annular iron plate is welded on the top of the casing short section, an annular space in the top of the casing short section is enclosed, the female union head is connected with the exhaust pipeline through the threads and integrally welded on the annular iron plate, and a passage is formed in the top of the casing short section. The casing coupling, the liquid inlet pipeline and the exhaust pipeline are connected with one another through adopting the threads and unions, so that the circulating joint has a good sealing effect, can bear high voltage and prevents slurry sprinkling and environment pollution; air accumulated in a casing string can be effectively eliminated so as to prevent gaskick from causing danger; and the circulating joint is simple in structure and convenient to operate and can be repeatedly used.

Description

Casing Grouting Circulation Joint

technical field

The utility model relates to a petroleum drilling engineering device, in particular to a casing grouting circulating joint in the casing grouting operation process of petroleum drilling.

Background technique

In the general oil drilling casing operation process, a certain amount of casing strings are lowered into the wellbore, and a certain amount of mud must be poured into the wellbore to balance the pressure of the fluid column in the wellbore. At present, drilling teams use self-made simple circulation joints or direct injection of mud pipelines to grout the wellbore. The problem with this method is that the connection between the mud pipeline and the casing string is unreliable, and it is easy to disconnect, causing unsafe factors. The sealing effect of the pipeline and the casing collar is not good, causing a large amount of mud to spill and pollute the environment. There is no channel to discharge the air in the wellbore, which is easy to form air surge and cause danger.

purpose of invention

The purpose of this utility model is to design a casing grouting circulation joint, which can effectively solve the problems existing in the use process of the existing simple grouting joint, and is simpler to operate, safer and more environmentally friendly, and more practical.

Contents of the invention

The purpose of the utility model is achieved in that the casing grouting circulation joint is composed of casing pup joints, liquid inlet pipelines, male unions, annular iron plates, exhaust pipelines, and female unions. The lower part of the casing nipple is processed with standard casing threads, which are directly connected to the top coupling of the casing string. The male union is connected to the liquid inlet pipeline through threads, and is integrally welded to the casing nipple from the side. The annular iron plate It is flat-welded on the top of the casing sub-joint to seal the top annulus of the casing sub-joint. The female union is connected to the exhaust pipeline through threads and welded on the annular iron plate as a whole to form a passage on the top of the casing sub-joint. The male union head can be directly connected to the grouting pipeline, and the female union head can be directly connected to the gas pipeline to discharge the air in the pipe string to the wellhead. The usage method of the utility model: when grouting is required during the casing operation process, the lower thread of the casing grouting circulation joint is directly connected with the coupling on the top of the casing string, the grouting pipe is directly connected to the liquid inlet pipeline, and the exhaust pipe is connected to the Connect directly to the exhaust line. When the grout needs to be poured, the pump can be directly turned on to inject it through the liquid inlet pipeline, and the air formed in the casing can be automatically discharged from the exhaust pipeline at the top of the circulation joint, effectively preventing the air in the casing from accumulating to form an air surge and causing danger.

The beneficial effects of the utility model are: the connection of each pipeline is reliable, which can effectively prevent the danger caused by the disengagement of the liquid inlet pipeline; the casing collar, the liquid inlet pipeline and the exhaust pipeline are connected by threads and unions, the sealing effect is good, and it can withstand high pressure , to prevent the mud from spilling and polluting the environment. Effectively eliminate the accumulated air in the casing to prevent the formation of air surges and cause danger. In addition, the device has the advantages of simple structure, convenient operation and repeated use.

Description of drawings

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

In the figure, 1 is the casing nipple, 2 is the liquid inlet pipeline, 3 is the male union head, 4 is the annular iron plate, 5 is the exhaust pipeline, and 6 is the female union head.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings; the casing grouting circulation joint is composed of casing puppet (1), liquid inlet pipeline (2), union male head (3), annular iron plate (4), exhaust The pipeline (5) is made up of a female head (6). The lower part of the casing pup joint (1) is processed with standard casing threads. When in use, it can be directly connected to the top collar of the casing string, and the male union (3) is connected to the liquid inlet line (2) through threads, and then It is integrally welded on the casing nipple (1) from the side. When in use, the male union (3) can be directly connected to the grouting pipeline, and the annular iron plate (4) is welded flat on the top of the casing nipple (1) to seal the top annular space of the casing nipple (1) , the female union head (6) is connected to the exhaust pipeline (5) through threads, and then welded on the annular iron plate (4) as a whole to form a passage on the top of the casing nipple (1). When in use, the female union head (6) It can be directly connected to the gas pipeline to discharge the air in the pipe string out of the wellhead.

The usage method of the utility model: when grouting is required during the casing operation process, the lower thread of the casing grouting circulation joint is directly connected to the top collar of the casing string, and the grouting pipeline is directly connected to the liquid inlet pipeline ( 2) Connection, the union female head (6) is directly connected with the exhaust pipeline (5). When the grout needs to be poured, the pump can be directly turned on to inject it through the liquid inlet pipeline (2), and the air formed in the casing can be automatically discharged from the exhaust pipeline (5) at the top of the circulation joint, effectively preventing the air in the casing from accumulating to form an air surge and causing danger.

Claims (3)

1. A casing grouting circulation joint, which consists of a casing nipple (1), a liquid inlet line (2), a male union (3), an annular iron plate (4), an exhaust line (5), and a union Composed of female head (6), it is characterized in that the lower part of the casing nipple (1) is processed with standard casing thread, which is directly connected with the top collar of the casing string, and the union male head (3) is connected with the liquid inlet through the thread The pipeline (2) is connected, welded on the casing nipple (1) as a whole from the side, and the annular iron plate (4) is flat-welded on the top of the casing nipple (1) to seal the top of the casing nipple (1) In the annular space, the female union head (6) is connected with the exhaust pipeline (5) through threads, and is integrally welded on the annular iron plate (4), forming a passage at the top of the casing nipple (1). 2. A casing grouting circulation joint according to claim 1, characterized in that the male union (3) can be directly connected to the grouting pipeline. 3. A casing grouting circulation joint according to claim 1, characterized in that the female union (6) can be directly connected to the gas pipeline.

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