What should we pay attention to when managing CNPC drill pipe?

Posted by BAOWI STEEL MANUFACTURING CO.,LTD on April 17th, 2024

Construction process analysis and summary issues: After passing the final acceptance, after installing the steel cage and conduit (this process takes no more than 1 hour), the sediment thickness is detected to exceed the standard. Reason analysis: The reason for this situation is that the mud has poor performance and the specific gravity is less than 1.1. The on-site construction personnel believe that the rotary drilling pipe makes the hole and the rotary bucket lifts out all the drilling slag, unlike the rotary drilling pipe or impact drill that relies on mud to discharge slag. , so the slag content in the mud is small, and the specific gravity of the mud can be adjusted to be relatively small while ensuring the stability of the hole wall, which can easily meet the requirements of the hole cleaning acceptance index. However, when crossing the sand layer, there is still a considerable amount of sand mixed into the mud, and its content exceeds the scum capacity of the mud itself. After the final hole, the mud is at rest during the installation of the steel cage and conduit. Due to the small specific gravity of the mud and weak scumming ability, the sediment quickly settled to the bottom of the hole, causing the sedimentation thickness to exceed the standard.

Matters that should be paid attention to in construction technology management.

1. Thick-walled drilling pipe strictly implement the technical disclosure system and conduct pre-job training for on-site technical, management personnel, and construction team workers to ensure that everyone is aware of the situation.2 Sulfur-resistant drill pipes will increase on-site inspections and standardize the technical operation procedures during construction.

2.During the construction of bored piles in sand layers with weighted drill pipes, the length of the casing should be appropriately increased or reduced according to different strata to ensure that the casing extends into the stable soil layer by no less than 50cm. 4. Oil drill collars increase the frequency of mud detection, carry out mud adjustment and replenishing in time to ensure that the mud specific gravity is always maintained between 1.4 and 1.6 during drilling.

3.The oil drill pipe is equipped with a mud preparation tank, a circulation tank and a cleaning tank to improve the quality of the cleaning hole, improve the turnover efficiency of the mud, and further save construction costs. Key points in the construction technology of rotary drilling rigs are to adopt a sand fishing type bottom-sealing drill bucket: in use When a rotary drilling rig drills in a sand layer, if an ordinary drill bucket is used to drill, it is easy to "run away". Therefore, the engineering and technical personnel actively carried out process and technical transformation, and finally decided to adopt a simple operating process and technical requirements. The relatively low sand-fishing bottom-sealing drill bucket is equipped with a ventilation hole on the drill bit to ensure the flow of mud up and down the drill bit during the drilling process and prevent the occurrence of vacuum during the drilling process.

After the rotary drilling rig is started, drill at a low speed first, and ensure that the wire rope of the main winch bears more than 20% of the weight of the drill bucket and drill pipe. Be sure to strictly check whether there is any sub-position deviation during the drilling process. question. Strictly control the proportion of mud: During the drilling process of the rotary drill, strictly control the proportion of clay to mud between 1.4-1.6.

To learn more, please visit the website:
www.baowi-steel.com