structure

The components of Christmas tree mainly include tubing head, tubing hanger, flange and some valves. Valves mainly include nozzle (throttle valve), production wing valve, wax removal valve, main valve and casing valve;

Tubing head

The tubing head is installed on the top of the uppermost casing head to support the gravity of the tubing string and seal the annulus between the tubing and the reservoir casing. Working pressure of tubing head: 1000, 2000, 3000, 5000, 10000, 15000, 20000psi. The rated temperature is -18 ° C - 121 ° C. During well completion, the rated working pressure of the tubing head is generally selected as the formation fracture pressure, which matches the rated working pressure of the tubing hanger.

Tubing hanger

Tubing hanger is a device that hangs tubing string in the cone seat of tubing head and provides sealing between tubing and cone seat. Generally, there are conical tubing hangers, eccentric tubing hangers with cable through holes, self sealing tubing hangers and double tubing hangers. There is a BIW cable crossing port, two 1/4innpt hydraulic control pipeline crossings and a 3/8innpt chemical injection port on the oil pipe hanger. The upper opening of tubing hanger is 4-1/2ineue threaded port.

Upper flange

The upper flange is between the oil pipe head and the oil pipe cross, and the lower flange has 1inlp pressure test hole and 1inlp injection hole.

tubing spool

The tubing cross is an integral Christmas tree, which is composed of wax removal valve, main valve and production wing valve. Its lower part is connected with the upper flange and its upper part is connected with the Christmas tree cap.

Christmas tree cap

The Christmas tree cap is installed on the wax removal valve on the top of the Christmas tree to provide an access to the oil pipe space quickly from the longitudinal direction. If steel wire operation, coiled tubing operation, production test, sliding sleeve opening and closing, back pressure valve loading and unloading and other operations are carried out, the Christmas tree cap can be removed first. The bottom of Christmas tree cap is API flange or thread.