Structure Improvement and Application of Fixed Valve Pull-out Pump

Structure Improvement and Application of Fixed Valve Pull-out Pumps WANG Ze-Xiang, LI Yong-Bing, WANG Fang, ZHU Hong-Wei, DONG He-Ru (Bohai New Century Machinery Manufacturing Company, Tianjin 300280, China) 1 Difficulty, the fixed valve cannot be pulled out smoothly, and the operation cost and time are increased. . Improved fixed valve puller structure with threaded connection and loose structure. The improved fixed-valve extractable pump was applied 14 times in the Amandali Oilfield. The average pump efficiency reached 67.5%, and the average output was 44.35t/d. The operation of the fixed valve was simpler, more reliable, and the application effect was good.

The fixed-valve pull-out pump used abroad adopts a salvage head and a fishing claw structure for the fixed valve puller. When inspecting the pump, lower the pole and rotate the pole so that the salvage head is hung in the salvage claw and the fixed valve is raised to the pump cylinder. Therefore, the pump can be operated without raising the string, which saves time and reduces operating costs. The well is being well-washed, so it is widely used abroad. However, with the increase in the depth of oil well pumping at home and abroad, it is difficult to salvage this type of structure, often due to the fact that the fixed valve cannot be pulled out smoothly, and other abnormal operations such as taking off the tubing are increased.

In view of the above problems, Bohai Petroleum Equipment New Century Machinery Manufacturing Co., Ltd. optimized the design of the fixed-valve extractable pump, and changed the structure of the salvage head and the salvage claw to be screwed and loosened. In view of the high salinity, severe corrosion, and sand content of oil wells in the Amandali Oilfield, cemented carbide ball and valve seats are preferred to improve corrosion and erosion resistance, which is better than conventional stainless steel ball and valve seats. Long life, high pump efficiency. The improved fixed-valve extractable pump has achieved good results in the Amandali oil field.

1 structural work principle fixed valve removable pump is based on the common pump, increase the fixed valve puller, pull-out fixed valve, seal locking joints, such as the structure. The end of the fixed valve extractor adopts a thread structure. As the rod is placed on the bottom of the pump, the fixed valve extractor is in contact with the fixed valve cover, and the threaded rod of the rotary rod is connected to form a connection. The fixed valve can be pulled out smoothly to realize the inspection of the pump. Well washing operation.

1—Plunger closed valve cover; 2,10—Valve ball; 3,11—A valve seat; 4—Oil inlet joint; 5—Spring; 6—Guard cap; 7—Fixed valve extractor; 8—Pump tube 9 a fixed valve cover; 12 - tubing couplings; 13 - sealed lock; 14 a sealed locking joint fixed valve puller and pullable fixed valve structure downhole operation, manually lower the plunger fixed valve The extractor and the fixed valve assembly are tightened. Record the value of the workover rig table. Lower the plunger until it no longer descends, relying on the gravity of the stem to press the fixed valve assembly into the seal lock fitting. Invert the mast for 69 turns and slowly raise. Observe that the reading of the work rig weight table is equal to the previously noted value. At this time, the fixed valve puller is disengaged from the fixed valve cover and the anti-punching distance test is adjusted.

When the pump is inspected, lower the plunger so that the fixed valve puller at the lower part of the plunger and the fixed valve cover assembly are connected. Turn the cylinder clockwise by 69 turns on the ground and lift the mast to observe the weight table of the workover rig. The force should be increased by more than 15kN. The joint between the fixed valve puller and the fixed valve cover at the bottom of the plunger is successful, and the entire well is continued to be docked. Pole and plunger until.

3 Main technical parameters (as shown in Table 1) Table 1 Main technical parameters Nominal diameter / mm Plunger length / mm Tubing thread stroke / m Maximum diameter of the rod rod outer diameter / mm 1) Only need to put the plunger and fixed when checking the pump operation Valve can be.

The pump can pull the fixed valve out of the tubing for inspection and replacement, reduce the inspection time and operating costs, and reduce the pump loss.

2) The fixed valve can be pulled out to perform the positive well-washing operation. Compared with the backwash well, the use of the well-washing fluid is reduced, and the pollution to the oil layer is reduced.

3) The pump does not need to be equipped with a leaker. Pull out the fixed valve to drain the oil.

4) Under normal circumstances, the pump cylinder assembly and the fixed valve assembly of the pump are put into the well at the same time; if there is special need (if the pump is tested, the perforation is performed), the pump cylinder assembly can be put into the well by the oil tube to complete the special After the operation, use the extractor at the lower part of the plunger to carry the fixed valve assembly into the well, which can save the time and cost of starting the column.

As of the end of 2011-11, a total of 14 wells were used for fixed-valve extractable pump in Amandali Oilfield. One well was converted to self-injection. One well did not flow due to formation reasons, and the other 12 wells were once. Enter normal production. A fixed valve is proposed to perform a well flushing operation, which saves operating time and reduces operating costs.

The use of carbide valve, corrosion resistance, high hardness, reducing the chance of damage, high pump efficiency. The average pumping efficiency of the 12 wells reached 67. The average daily production rate was 44.35t/d, which was 10.65t/d higher than the average production rate of other wells in the oil field. Production data are shown in Table 2. Table 2 Production data of Amandali Oilfield Pound stroke / stroke times / pumping pump depth / m daily oil production / t daily production / t water / gas / theoretical displacement / pump efficiency / PDC bit torque control technology analysis Han Fei Guo Huijuan Dian Yang 2, Yang Siyuan Yang Lei 1 (1. Research Institute of Drilling Engineering, China National Petroleum Corporation, Beijing 100195, China; 2. The Office of China National Petroleum Corporation, Beijing 100007, China) 1 The service life of the drill bit and the reduction of the ROP. Based on the analysis of foreign advanced PDC bit torque control technology, the suggestion of domestic similar technology research is proposed.

1) Fixed-valve extractable-tube type oil pump adopts screw connection and loose structure, which can realize the fixed valve to check the pump and the well-washing operation, saving the operation time and reducing the operation cost.

High hardness, reducing the chance of damage, high pump efficiency.

System and application. Petroleum Machinery, 2005, 33(4) 64-65. Yu Xinjian, Wang Zhiming. Structural Optimization Design of Special Rod Pumps . Shi Shen Dicheng, Ai Wancheng. Suction pump. Beijing: Petroleum Industry Press, Continued from Table 2. Pl. Stroke/ChongXi/ Suction Pump Straight Pump Hanging Depth/mæ›° Oil Production/tæ›° Produced Liquid/t Water/Gas/ Theoretical Displacement/Pump Efficiency/ 6 Conclusions

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