Views: 17 Author: pqwt Publish Time: 2022-09-08 Origin: PQWT
Drilling is a systematic project, which is a joint operation of multi-disciplinary and multi-job types using various equipment, tools and materials. At the same time, it is a continuous operation with multiple procedures closely connected and multiple links interlocked. Today, the drilling company will tell you about the specific process of drilling work.
1. Pre-drilling operation
The main task of pre-drill operation is to prepare the drilling conditions. The main tasks of pre-drilling are: building simple roads, transporting drilling equipment such as derricks, leveling the well site and installing derricks, and preparing water and equipment for drilling.
It includes the following: determination of well location, implementation of water sources, road construction, foundation construction, derrick installation, rig relocation and installation, earthwork construction, complete set of water, electricity and telecommunications road laying and installation of anti-freeze insulation facilities, as well as the preparation of drilling tools and materials for drilling, and the preparation of the wellhead for drilling (including down conduit and flushing rat holes).
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2. Drilling the surface layer
The surface strata are generally soft and must be reinforced after drilling in order to continue to drill deeper. This reinforcement is generally used to enter the large size of the surface casing and cement the casing and the formation tightly cemented (called cementing) to complete. Therefore, when drilling surface strata (commonly called "one open" in the field), it is necessary to use a large size drill bit and drill to an appropriate depth (too shallow will affect the subsequent drilling if the soft strata are not well reinforced, too deep will increase the cost and cause waste, generally in the range of ten to one or two hundred meters).
3. Drilling into the target layer
After the surface layer is well consolidated, a drill bit of a certain size smaller than the first opening is used to drill deeper into the strata (referred to as "second opening"). At this time, it is necessary to continuously record geological data and to encrypt the geological data when needed or in the required section of the well to solve the problems related to geological research and drilling engineering.
4. Intermediate testing
Some exploratory wells may find good hydrocarbons before drilling to the designed level, so drilling can be stopped as needed and a conduit can be made from the bottom of the well to the wellhead using drill pipe to test for the purpose of confirming the oil content and productivity of the formation. This is a mid-hole test, and drilling will generally continue after the mid-hole test is completed.
5. Completion Electrical Testing
In the process of exploratory well drilling, if valuable oil, gas and water formations are found, logging can be arranged at any time depending on the specific situation, but this is usually not very often. When a well is completed, a systematic and comprehensive logging is usually performed to obtain information on multiple items for the entire well.
6. Cementing and Completion
Reinforcing the wall of a drilled borehole is called cementing. The operation of drilling the target layer and establishing a connection between the target layer and the wellbore is called completion. The purpose of well completion is twofold: first, to establish a smooth flow of oil and gas from the formation to the wellbore; second, to reinforce the well wall in the oil formation.