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At present, most pumping wells at home and abroad use tubular pumps. Since the tubular pump fixed valve is unidirectional, during the oil pumping process, the crude oil coming out of the formation enters the pump through the fixed valve and is discharged to the ground. During the pumping process, it was found that the liquid in the well passed through the fixed valve. On the one hand, the liquid contained impurities, and the fixed valve could not be restored to the original position, and would always be in an open state; on the other hand, the liquid entered the pump through the fixed valve. The fixed valve fails due to wear or erosion of the liquid. If the fixed valve of the single fixed valve pump does not work, then a non-periodic pumping operation of the well is required.
In response to this problem, the scientific research personnel of the underground technical operation company of the Tuha Petroleum Exploration and Development Headquarters jointly carried out experimental research with the workshop of the 12th block oilfield of Georgia, and changed the single fixed valve of the oil pump to the double fixed valve, which is the fishing type. Double fixed valve oil pump. This pump has achieved good results in the application of the national 12 block oil field in Georgia.
technical analysis
1 structure
The structure of the double fixed valve pump is to add a fishing fixed valve and a fixed valve fishing device based on the ordinary pump. The fishing fixed valve and the fishing device are the fishing claws from the top to the bottom (connected to the piston of the pump through the thread), the fishing head (connected by the threaded and fixed fishing valve), the circlip, the adapter, the secondary seal , fishing fixed valve cover, ball, ball seat and pressure cap.
The cylindrical fishing claw has two hook-shaped grooves in opposite directions, and the fishing head is welded with a cylindrical cross bar. The groove width of the hook groove is slightly larger than the diameter of the cross bar, and the cross bar enters or disengages the hook groove. The connection or separation of the fishing claw and the fishing head can be achieved.
2 Working principle
The fishing type fixed valve is manually hung on the fishing claw, and is transported by the piston of the pump to the upper position of the supporting nipple, and then loaded with 419 to 918. The two secondary sealing rubber rings gently pass through the steel ring due to the compression effect ( With chamfer on 60b and chamfer under 30b), the sealing rubber ring and the supporting short joint are sealed together. At this time, the circlip at the upper end of the valve body enters the supporting nipple at the same time. The circlip shrinks and sits tightly on the supporting nipple. Inside, the valve body can not go up during work, and the pump body rim supports the circlip on the valve body, so that the valve body can not descend, so that the two achieve a first-level seal. When the fixed valve is set, the rod is lifted to the original hanging weight and rotated 1~2 times, so that the fishing head is transferred from the hanging position of the fishing claw to the vertical position of the trough, and the salvage head is lifted to remove the fishing claw from the salvage head. After opening, for the anti-shock distance, start the pumping unit, the fishing fixed valve starts working.
Before checking the pump, the part of the pump failure should be judged according to the oil well diagram. If the fixed valve fails, the pole should be deepened and the pole should be reversed for 1~2 times. At this time, the salvage claw of the salvage catches the salvage head. The fixed valve is salvaged (in the process of reverse fishing, the operator should carefully observe the change of the displacement of the pole. If the pole moves downward during the rotation, the rotation should be stopped immediately, which proves that the salvage is successful. By careful observation To ensure the success of salvage and prevent the counter-torque effect, repair or replace the new valve and re-enter the well. If the part above the fixed valve fails, it is only necessary to take out the replacement of the piston, but if the operation of the well has reached the pumping cycle, it must be taken out after all the pumps are taken out.
3 main technical parameters
4 Features
(1) The fishing type fixed valve works reliably, and the valve body is tightly seated in the supporting short section, and the steel ring of the pump body supports the circlip of the valve body, and the valve body cannot move up and down during the work, so It will not damage the valve body and ensure the normal production of the oil well.
(2) The valve is transported by the piston of the oil pump to the setting position. After the valve is set and released, the data is adjusted and the pump is turned on. The pump does not need to be disassembled for installation on site, so the valve is easy to use and has no repetitive processes.
(3) In the process of pumping oil, the valve does not work properly due to the dirt or valve wear and erosion, which reduces the pump efficiency, so that the pump inspection operation is carried out. However, after installing the double-fixing valve of the fishing type, the defect that the pump cannot work normally due to the failure of one fixed valve is avoided, and the operation cost is greatly reduced.
(4) After the use of the double-fixing valve, the maintenance is simple. Generally, only the rubber sealing ring and the valve ball can be replaced, and the replacement parts are small, and the repair rate is high.
Field Application
The double-fixed valve pump can be applied from July 2002 to the current 85 wells in the 12th block of the National Oilfield of Georgia. During the operation, one of the wells was caused by the unsatisfactory oil pipe before the lower pump, which caused the pump to be damaged, resulting in damage to the pump body. The success rate was 99% and the fixed valve was reliable and convenient to set up and salvage. In the construction process of these wells, they were all successful at one time. The pump used in the past uses a single fixed valve. During the pumping process, the pump needs to be checked as long as there is a problem with the fixed valve. The improved pump adds a fishing-type fixed valve that can be replaced without the oil pipe during operation. In this way, on the one hand, the pump inspection cycle is extended, and on the other hand, the operating cost is saved. According to statistics, up to now, among the 85 wells under construction, the average pumping cycle per well has been extended by 018 times, and various expenses such as operation savings have been reduced by about 175.18 million yuan. (1) The use of a fishing double fixed valve pump ensures safe and reliable operation of the pump in the well. (2) The pump has a simple operation process and a high construction success rate. There are fewer replacement parts and high repair rate during maintenance.
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