The application of API7K high pressure mud pipe is of great help to my country’s petroleum industry, coal industry and other industries. However, there are also some problems in the use of high-pressure mud pipes, such as affecting the work efficiency and construction quality to a certain extent. Therefore, the mud piping system is required to have high drill bit quality and better mud quality. When conditions permit, it is necessary to use a drilling tool with adjustable pressure difference instead of increasing pressure and torque by traditional methods to reduce pressure, while ensuring that the mud flows within a good range and preventing drill bit leakage. During use, care should be taken to protect the drilling tool to avoid high pressure and damage to the mud conveying system. In the case of new equipment, it must be properly operated in accordance with the equipment instructions, and the drilling device must be protected from damage or blockage. Accessories such as connecting joints, pipelines and inspection holes must be provided on the pressure gauge and electric pump control device.

1. High mud pressure

High mud pressure is a phenomenon caused by the unstable rotation of the rotary drilling tool during the drilling process of the drill bit. There are several reasons for high mud pressure during drilling: severe tool wear and shortened tool life; impurities in the tool; deflection of the derrick hole at the lower end of the tool.

2. Large mud flow

The resistance of the drilling tool is large, the torque is small, and the formation is prone to sticking. Therefore, measures need to be taken to ensure the effect of drilling and mud removal. According to the resistance of the drilling tool and the drilling speed, the following measures can be taken: first, press the drilling tool into the hole, so that the pressure in the hole matches the pressure of the drill bit, so as to improve the drilling speed; at the same time, reduce the flow rate of the drilling tool to the safety allowable Within the range, keep drilling at a small flow rate (note: drilling with a small displacement turbo pump); secondly, reduce the number of mud discharges and reduce the mud discharge speed; finally, reduce the cycle time and prolong the mud discharge time. The duration of mud discharge is related to factors such as formation pressure and downhole resistance.

3. The length of the pipe that can transport mud is more than 8 m or the diameter of the pipe is less than 3 m (diameter 1 mm).

When using drill pipes with a diameter greater than 4 m or a length greater than 8 m, large-diameter drill bits should be used when passing through the mud pipeline system. There should be supporting devices and guiding devices on the pipeline to avoid the sudden disconnection or bending of the pipeline and the unbalance of the drill pipe. Check the parts for damage and oil leakage, and pay attention to the tightness of mud pipes and pipe joints. In addition, guide sleeves are required to ensure the center alignment of the pipe ends. A guide device should be provided on the pipeline to guide the drill pipe carrying the mud to the bottom of the hole. Equipment such as mud conveying pumps and electric pumps should also be installed in the pipeline system. When transporting clean water, attention should be paid to the water quality, so as not to cause mud blockage or pressure rise to cause fire accidents; when drilling, a pressure gauge should be installed to adjust the pressure of the drill bit in time and maintain the optimal depth of the drilling under the working pressure; During the construction period, a mud pump should also be installed to ensure that the drilling mud has a certain flow rate and is transported to the water injection hole in time; if the construction process has high requirements on water quality, a centrifugal pump, a vacuum oil filter and a self-priming pump can be used. other equipment.

4. Small mud pressure loss

The pressure loss of mud is one of the important indicators to measure the performance of mud. The higher the rotation speed of the drilling tool, the greater the impact and wear of the mud on the drill pipe due to the greater pressure. When the rotational speed of the drill tool increases, the pressure loss of the mud from the drill hole is greater. Therefore, controlling the pressure loss of the mud is of great significance to improve the construction quality. At present, my country has successfully used PTFE high-pressure mud pipes and achieved success in some fields. It is characterized by compact structure, durability, large flow rate, no leakage, low resistance and long service life. Good reviews. At present, PTFE high-pressure centrifugal ductile iron pipe is gradually replacing high-density ductile iron pipe as the main steel pipe material.

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