Shengli Oilfield R&T Group

Wellhead & X-mas tree  or  Christmas tree  is a wellhead control equipment for testing oil and gas when the oil (gas) well is completed, or a wellhead control device when the oil is used for oil recovery. It consists of tubing and many gates and tee or four-way, directly mounted on the casing head. Only one side of the oil tree with the oil pipeline, called the single wing Christmas tree; The two sides are lined with tubing, known as the double-winged tree. The oil Christmas tree is equipped with oil nozzle (choke nozzle) to control the production of oil and gas by changing the oil nozzle of different diameter. The main components of the Christmas tree are tubing head, tubing hanger, flange and some valves. The  oilfield wellhead valves  mainly have the oil mouth (throttle), the production wing valve, the paraffin valve, the main valve and the casing valve. Tubing head The tubing head is mounted on top of the top casing and is used to support the gravity ...

First, open wells (from the injection well): Make sure that the production system is completed and that the flow is smooth enough to accept fluids after well opening. All the valves on the Christmas tree oil oilfield are in the correct switch state and can control the nozzle (adjustable nozzle). Check the wellhead hydraulic and safety equipment status. Second, shut the well (since the injection well) Third, in some downhole operations, the operating procedure of the Christmas tree valve is as follows: Close the well (nozzle, wing valve, purge valve, ground relief valve and main valve) before entering the downhole tool. Open the oil tree cap, install the high riser, the blowout preventer, and then test the pressure by the riser. Open the safety valve on the ground, with a fused screw cap on the safety valve to lock the ground safety valve. In the open position, test the reliability of the locking screw cap.   Lock down the hydraulic control circuit of tubing s...