1. The function of the anti spray pipe

The anti spray pipe is used φ Made of 73mm oil pipe with external sleeve φ The 89mm pipe annulus circulates steam or hot water (oil) for insulation (or non insulation circulation can be used, without the need for a jacket), which has two functions in the self flushing well: one is to perform the wax cleaning work before and after the wax cleaning, and to dissolve the wax brought up by the wax scraper; The second is the lifting and lowering of various testing and well testing tools. There are also two functions in electric submersible pump wells: firstly, it is convenient for lifting tools when measuring flow pressure and static pressure in electric submersible pump wells; The second is to remove tools and empty them when cleaning the wax in the electric submersible pump well.

2. The function of rubber valve (with sealing device)

(1) Cut off the pressure underground when the wax scraping test tool rises to the anti spray pipe;

(2) Trial closing of the rubber valve can determine whether the downhole tool has risen to the anti spray pipe to prevent it from falling into the well;

(3) In the pumping well, close this rubber valve before adding the polished rod packing.

3. Test the function of the valve (250 valve)

This valve is used to connect rubber valves for ease of pressure measurement, well testing, etc.

4. The function of oil pipe spool

The four universal oil pipes are used to connect the testing valve with the main valve and the left and right production valves, and are necessary channels for oil well production and water well testing.

5. The function of the main valve

The function of the main valve is to cut off the pressure at the bottom of the well during the maintenance of equipment other than the main valve.

6. The function of casing cross

The function of the large spool, as shown in Figure 6-1, is the main component of the tubing casing that collects nodules. Seal the annular space of the oil sleeve and separate the oil sleeve through it. The external pressure is the casing pressure, and the internal pressure is the tubing pressure. Short circuit the lower connecting sleeve.

7. The role of casing short circuiting

The upper part of the casing is threaded to the lower flange of the cross, while the lower part is connected to the casing. The casing can be adjusted according to the height of the well site and during construction to meet the requirements of improvement or reduction.

8. Steel plate support effect between surface casing and production casing

This structure connects the production casing and surface casing to prevent vibration of the Christmas tree.