In order to achieve reinforcement of the borehole wall, it is guaranteed to continue safe drilling, seal oil, gas and water layers, ensure stratification testing during exploration and reasonable oil and gas production throughout the mining process, etc. The operation of filling the cement in the annular space of the steel pipe is called cementing engineering. So why are the steps of cementing? Today, Cementing Head China Factory is here to explain the four steps of cementing:

1. Casing

The casing is different from the drill pipe. It is a one-time pipe that is not required to be thickened. The length is not strictly defined. In order to ensure the cementing quality and smoothly enter the casing, the structural design of the casing string is to be carried out. The strength of the casing is designed according to the application, the predicted pressure of the formation and the depth of the casing, and the wall thickness, steel grade and thread type of the casing are determined.

 2. Cementing

Cement injection is a key process after casing entering the well. Its function is to seal the annular space of the casing and the well wall to seal the oil and gas water layer, so that the casing becomes a passage for oil and gas to pass into the well.

3. Wellhead installation and casing pressure test

After the casing is cemented, the wellhead is installed during the solidification of the cement. The top end of the surface casing is to be the casing of the casing head. The top end of each layer of casing is hung in the casing head. The casing head is mainly used to support the weight of the technical casing and the oil casing, which is especially important for the cementing cement not returning to the ground. The casing head is also used to seal the annular space between the casings to prevent pressure build-up. The casing head is also a transitional connection between the blowout preventer and the tubing head. There are also two side ports on the casing head for use on the land to replenish cement and monitor well conditions. Note the operation of balance liquid.

4. Check cementing quality

After the casing head is installed and the blowout preventer and the blowout preventer line are connected, the pressure resistance check of the casing head seal and the seal pressure test connected with the blowout preventer are performed. After testing the cement plug in the casing, the pressure test of the casing string should be carried out. After drilling through the casing shoes for 2~3 meters (technical casing), the ground fracture test should be carried out. The production well should be tested for the quality of the cement ring, and the sound wave should be used to detect the cementation of the cement ring and the casing and the wall. After all the cementing quality indicators have passed, the next operating procedure can be entered.

We have a lot of cementing equipment available for you, for example: Cementing Plug, Cementing Head, Cementing Basket, etc. If you are interested in our Oil Machinery, you can contact us directly.