The pipe cross is a commonly used pipeline connection component, widely used in petroleum, natural gas, chemical industry and other fields, especially in the exploration of oil and gas resources, it is connected with key good control equipment such as blowout preventer and choke and kill manifold through the cross, because The special installation position and effect of the pipe cross and the non-replaceable characteristics during drilling, once the pipe cross is severely eroded and worn or even pierced, it will cause time and space at the wellhead and cause major safety accidents. Therefore, the anti-erosion function of the pipe cross is very important.
The existing pipe cross are divided into two types according to the structure: one is an integral pipe cross, and the other is a split pipe cross.
The split cross is to cut two tees and connect them into one cross, and then make the weld seam seamless. The cost of the cross produced by this method is low, but the process is more troublesome, and the quality is not as good as the overall cross. better. The integral cross is forged or cast as a whole, and the structure is stable, but the main diameter and bypass diameter are fixed values, which leads to severe erosion and wear near the intersecting line.
Skill completion elements: In view of this, the purpose of this utility model is to provide an integral cross to improve the anti-erosion function. In order to achieve the above purpose, the utility model provides the following technical plans: an integral pipe cross, including a main passage and two side passages intersecting with the main passage, where the side passage intersects with the main passage The inner diameter of the side channel is larger than the inner diameter of the side channel away from the intersection. Preferably, in the above-mentioned integral pipe cross, the inner wall of the bypass channel is composed of a tapered section and an equal-diameter section, the larger end of the tapered section communicates with the main channel, and the tapered section The smaller end communicates with one end of the equal-diameter section, and the diameter of the smaller end of the tapered section is equal to the diameter of the equal-diameter section. Preferably, in the above integral cross, the bypass channel is composed of a circular frustum and a cylinder, the tapered section is the inner wall of the circular frustum, and the equal-diameter section is the inner wall of the cylinder. Preferably, in the above-mentioned monolithic pipe cross, the inner diameter of the bypass passage intersecting with the main passage is one diameter grade larger than the inner diameter of the bypass passage away from the intersection. Preferably, in the above-mentioned integral pipe cross, the main channel is an equal-diameter channel. Preferably, in the above integral pipe cross, the two bypass channels are coaxial and perpendicular to the axis of the main channel. Preferably, in the above-mentioned monolithic pipe cross, a cemented carbide layer is provided on the inner wall of the bypass channel and at the intersecting line. Preferably, in the above-mentioned one-piece cross, a cemented carbide layer is provided at the gasket groove on the flange surface of the bypass channel. Preferably, in the above integral spool, the cemented carbide layer is formed by surfacing.
Compared with the existing technology, the beneficial effect of the utility model is that: in the integral pipe cross provided by the utility model, the inner diameter of the side channel intersecting with the main channel is larger than the inner diameter of the side channel away from the intersecting part, because the erosion the speed is proportional to the speed, that is, the greater the speed, the higher the erosion rate, and when the displacement is constant, the speed is inversely proportional to the flow area. When the inner diameter of the bypass channel increases, the flow area at the intersection of the bypass channel increases. On the contrary, when the fluid flows near the intersection line of the bypass channel, the velocity decreases, and then the erosion rate when it flows through this area also decreases. The anti-erosion function of the integral cross is improved.