As of the end of November 2006, Karamay Oilfield Heavy Oil Company statistics wells accounted for wells accounted for 32.5% of the total number of wells, indicating that the actual utilization of oil wells in heavy oil companies is not high, that is, heavy oil companies have a considerable "capital" in Idle state. There are many reasons for the formation of shut-in wells, mainly due to factors such as high water cut, serious casing change, poor development effect, low yield and low liquid, sand card pump, etc. Among them, heavy oil company six-nine block sand production is serious, resulting in Sand wells card pump wells account for 26% of the block. How to make these serious sand wells to maintain normal production become a priority for heavy oil companies. In order to better solve the sand card of sand production, sand buried plunger phenomenon, heavy oil six-nine block selection Beijing Andong Petroleum Technology (Group) Co., Ltd. independently developed AOC special alloy sand control pump carried out on-site test.
AOC-165C alloy powder with independent intellectual property rights and internal surface spraying technology have been developed for the lack of material on the inner surface of the pump cylinder and the backward surface treatment technology. And the AOC alloy coating with the thickness greater than 0.25mm was prepared. Layer dispersed micron-sized carbide particles. This metallurgical bonding AOC alloy coating superexcellent in abrasive wear resistance and corrosion resistance.
Based on the innovation of coating in the pump barrel, the nickel-base alloy spray-welding plunger is optimized after wear resistance matching test. This configuration makes the pump cylinder and plunger wear resistance and corrosion resistance greatly improved, anti-wear test proved that the service life of ordinary pump cylinder, plunger 3 times.
The inner wall of the valve cover is made of AOC-150C alloy powder with independent intellectual property rights of Anton Oil as the coating, which has excellent impact resistance and abrasion resistance. The valve ball is made of finely cast, solidified cemented carbide that is twice as dense as a normal ball valve and is ideally suited for high-viscosity crude oil, well-worn and corroded downhole meson.
The utility model adopts a long plunger short pump cylinder structure, two ends of the pump cylinder are provided with an automatic adjustment scraper ring, and during the reciprocating movement of the plunger, there are always some plungers outside the pump cylinder, and the sand particles can not easily enter the plunger and the pump cylinder Clearance, eradication of buried sand plungers, and has the advantage of small downstream resistance. The design of runner valves and streamlined passages effectively reduces oil entry resistance and increases pump fullness while avoiding the deposition of sand in the working cylinder. Ingenious grit channel, to ensure that the oil well produced in the sinking grit smoothly fall into the pump under the grit tube, to avoid the stop pumping after the sand buried plunger and card pump.
This sand control pump is suitable for heavy oil steam stimulation of sand production, corrosion wells and thin oil sands, corrosion wells, sand output of 7% -10%, sand particle size of 0.01-3.0mm, the highest temperature of 150 ℃.
The mean middle buried depth of 260m, the effective thickness of oil layer is 5-20m, the average permeability is 2μm2, the density of crude oil is 0.92-0.96g / cm3, the viscosity of ground degassed crude oil is 15000-105mPa.s at 20 ℃, Mainly by steam huff and puff. The lithology of the reservoir is mainly composed of mud-cemented gray-tawny fine sandstone with loose cementation. Most of the cores removed from the reservoir are loose sand. According to workover out of the sand sample analysis, sand diameter 0.71-0.125mm, the main component of the sand is quartz, feldspar, cuttings. According to the sand analysis of crude oil sampled from the wellhead of the production well, more than 50% of oil wells carry oil, of which the number of wells with sand particle size of 0.01-0.05mm is about 88% and the number of sand particles with size of 0.05-0.10mm is about 4%, sand particle size greater than 0.10mm The number of wells is about 8%. Due to the smaller sand particle size, tiny sand particles can easily be carried by the oil flow into the pump barrel to cause the downhole pump card to affect the normal production of the well.
AOC special alloy sand control pump in the heavy oil company field application of 10 wells, mainly used in heavy oil vapor absorption sand wells, the average pump efficiency increased 12% than before; cumulative increase of 2769 square. Which saved the eight wells due to frequent sands can not be produced wells; 65009 wells inspection pump cycle has been extended for 130 days and continue normal production, the effect is significant; 65457 well sand, frequent card pump, pump cycle less than 31 days, Nissan liquid 1.9 tons, Nissan 0.3 tons, the use of Anton special alloy pump, Nissan 4.5 tons, 1.0 tons of daily output, has extended the inspection pump cycle 89 days, is still in production. AOC special alloy sand control pump from the scene into the test, no one due to the sand card, corrosion and lead to workover operations.
Anton oil AOC special alloy sand control pump with high-quality new materials ahead of similar products in the country, and has a long plunger short pump cylinder, scraping sand institutions, a large flow valve, grit channel and other optimization design, heavy oil company's Application has made other sand control pump can not achieve the good results, fully able to meet the heavy oil sands well pumping wells production requirements.