Drilling well construction scheme

1. Preparation for construction

Before the construction, it is necessary to carry out adequate preparation work, including site layout, equipment inspection and personnel organization. First of all, it is necessary to clean up the construction site to ensure that the construction site is smooth and free of debris, and to measure and lofting in accordance with the requirements of the construction drawings. Second, perform a thorough inspection of the drilling equipment to ensure its normal operation, and prepare the wearing parts and spare parts. Finally, according to the needs of the project, professional and technical personnel and operators are organized to clarify their respective tasks and responsibilities.

2. Well location determination

When determining the well location, the following factors need to be considered: First, the coordinate setting should be accurate, according to the construction drawings and Party A’s requirements, determine the wellhead location and the scope of the well site. Secondly, the orientation should be determined according to the geological survey data and design requirements, and the best shaft axis and drilling method should be selected. Finally, depth planning should determine a reasonable well depth and final hole depth according to geological conditions, construction difficulty and Party A’s needs.

3. Land survey

Land survey is one of the key links of well construction, which mainly includes strata survey, hydrology survey and engineering geological evaluation. It is necessary to determine the information of stratum distribution, thickness, lithology and mechanical properties. Hydrological investigation needs to know the parameters of groundwater type, water level, discharge, etc. Engineering geological evaluation needs to evaluate the influence of geological conditions on well sinking construction, which provides an important basis for the subsequent shaft design and well sinking construction.

4. Shaft design

Shaft design is one of the key links of shaft construction, which needs to consider the factors such as shaft diameter determination, shaft structure and wall material. Borehole diameter determination should be based on geological conditions, construction equipment and Party A’s needs, choose the appropriate borehole diameter and wall thickness. The wellbore structure can be selected in the form of casing or open hole, according to the formation conditions and construction difficulty. Wall materials should be selected with corrosion resistance and high strength to ensure the stability and service life of the wellbore.

5. Sinking well construction

Sinking construction is the main part of the whole project, including earthwork excavation, shaft construction and shaft wall reinforcement and other steps. Earthwork excavation should be carried out according to the design requirements, the excavation depth and width should meet the design standards, and the slope support should be done well. Proper drilling tools and drilling parameters should be selected in wellbore construction to ensure drilling efficiency and wellbore quality. In the process of drilling, it is necessary to record lithology and test during drilling, learn formation information in time and adjust drilling parameters. The shaft wall can be reinforced by concrete casting or steel plate support to ensure the stability and safety of the shaft.

6. Wellbore inspection

After the completion of the shaft construction, the shaft needs to be tested to ensure the quality and safety of the shaft. The content of inspection includes well diameter inspection, well depth inspection and well wall integrity inspection. Diameter measuring instrument, laser rangefinder and other equipment can be used to measure whether the diameter of the wellbore meets the design requirements. Well depth detection can use wire sounder and other equipment to measure whether the well depth meets the design requirements. Borehole integrity detection can use acoustic detection, television detection and other means to check whether there are cracks, dislocation, fall off and other phenomena.

7. Environment recovery

Sinking construction will have a certain impact on the surrounding environment, so it is necessary to restore the environment after the completion of construction. First of all, clean up the garbage and waste materials at the construction site to ensure that the site is clean and safe. Secondly, the surface restoration of the construction site should be carried out, including land regulation, vegetation restoration and other measures to reduce the damage to the ecological environment. Finally, the surrounding environment should be monitored to understand environmental changes and provide a basis for subsequent environmental management and protection.

8. Security measures

Sinking well construction has certain risks, so it is necessary to take corresponding safety measures. First of all, we must ensure that the safety facilities of the construction site are complete, including safety railings, safety nets, warning signs and so on. Secondly, it is necessary to strengthen the safety training and education of operators to improve their safety awareness and operational skills. During the construction process, safety operation procedures should be strictly observed to ensure safe production and quality.