Introduction to 40 mpa high elbow sealing technology improvement

Introduction to 40 mpa high elbow sealing technology improvements - 2020 07 - 14 Chen Leixiong except for mao-lin he hong-guang han ( Sinopec shengli oilfield branch company, dongying, shandong province, 25723) Abstract: in view of the oilfield construction of cement car 40 mpa high elbow liquid leakage, there is no guarantee that the construction stress and displacement, pollution wellsite, elbow short life problems. Analysis of thorn leakage due to its seal principle was flawed. Achievement by the expansion of the rubber seal, rubber expansion depending on the liquid pressure to achieve, therefore, before putting in place a rubber no expansion, the expansion amount is insufficient, causing low pressure and untight seal leakage. Increase elastic preload parts of sealing ring, increase pre-tightening force, eliminated high elbow liquid leakage. Keep the cement construction stress and displacement, guarantees the cleaner production. The improved technology successfully applied in a 17 sets of cement production plant is the car, completely put an end to the low leakage, high elbow has good popularization and application value. 40 mpa high elbow is in the process of oil and water well construction must be of high pressure manifold connection. Through high elbow, realizes the high pressure pipeline oil and water Wells and cement car any direction of high pressure pipeline connection. For a long time, high elbow in use process, when there is a low pressure outlet seal bad, liquid leakage, pollution well site construction; At the same time, due to the pressure of fluid, makes the stress and displacement in the process of cement car construction can not meet the specified requirements. Therefore, completely solve high elbow stab low-voltage leakage is very necessary. Therefore, the production plant, the car brigade conducted 40 mpa high elbow to the research and application of low voltage thorn leakage prevention, and got good effect. 140 mpa high elbow thorn leakage of 40 mpa high-pressure activity main connect well with the high pressure cement car pipe elbow. In use process, existing elbow joints liquid leakage. Stab at low pressure is particularly serious leakage. After the leakage of liquid, fluid pressure in the injection well and displacement can not meet the requirement of the construction technology, wellsite pollution can not meet the requirement of the cleaner production. High pressure elbow thorn leakage, therefore, become the important factors affecting cement car well site construction. Below elbow the thorn leakage for high pressure activity and scrap. 240 mpa high elbow structure analysis showed that 40 mpa high elbow is mainly composed of elbow body, and with the combination of elbow joint and hammer consists of nonyl. Elbow joint is placed in the hole of the elbow body, flange type rubber seal placed in the junction of the elbow body and elbow joint, elbow joint and the bend between subjects with spherical ball track, through into the ball in the ball ball orbit, realize high elbow bend axial positioning of subject and elbow joint. Bend low pressure 340 mpa high-pressure activity thorn leakage cause analysis according to the structure of the 40 mpa high elbow is analyzed, the elbow after the assembly, rubber seal at the end of elbow joint and bend the body and between the inner hole of smooth. Due to the high pressure elbow must be able to turn, so the seal ring can't be pressure, makes the sealing ring and is in a state of clearance fit between the two plane. According to the design, high elbow type seal for flange seal. Rely on high pressure liquid pressure rise sealing ring to achieve sealing. Flange sealing ring is hollow rubber parts, under the action of liquid pressure, rubber ring expansion, makes the sealing ring end face seal. However, the expansion of the sealing ring deformation is along with the gradually increased with increasing of the liquid pressure. Only if the sealing ring deformation to extrusion condition, with the combination of end face can ensure good seal. If it is a long-term work under low pressure, sealing ring will not be able to guarantee the sealing, a liquid leakage. 440 mpa high elbow seal technology improvement measures according to the analysis of 40 mpa high elbow appeared low pressure seal undesirable defects on the key reason lies in its structure. Therefore, there is no guarantee that the low pressure condition of the seal. To improve low pressure sealing effect, when we are in high pressure activity in the elbow adds a corrugated flexible retaining ring. Rely on corrugated elastic force of the elastic ring to achieve sealing ring, under low pressure condition of preload solution under low pressure seal for less than the sting of the liquid leakage pretightening: at the same time, the elasticity of elastic ring can effectively buffer the construction process of the hydraulic impact of spherical ball bearing rail and steel ball wear. Deformation of elastic ring through to adjust axial clearance and pre-tightening force. 5 effect since 2009, in the production car brigade of successful implementation of 40 mpa high elbow seal technology improvement, the cumulative fix the abandoned high elbow 52, only through field experiment, solved the high elbow in the condition of low pressure liquid leakage problem, realize the construction site safety and environmental protection and ensure the construction process of stress and displacement of the real and effective, the annual implementation of 60000 yuan in economic returns, met very good effect. Conclusions 40 mpa high elbow seal technology improvement, by using the theory of elastic preload, solved the original high elbow defects for low pressure sealing, good sealing with low pressure and high pressure. Field application shows that this technological improvement is simple, low cost, good effect, has good popularization value. Source: 'new technology and new products in China' in 2012