Application of high temperature resistant sand control pump in production line in steam drive well group You Hongjun, Jiang Shengjian, Wang Tieqiang (PetroChina Liaohe Oilfield Company) You Hongjun et al. Application of High Temperature and Sand Controlled Oil Pump in Steam Drive Well Sets . Drilling and production technology, 2008 The key components of the oil pump are prone to corrosion and high temperature deformation, resulting in low pump efficiency, short production cycle, and can not reach the technical requirements of steam drive production lift. In view of the problems existing in the development of steam drives, research, tests, and optimization work have been carried out for the production of special oil pumps for steam drives. In the structural design and material selection, the oil pump has been improved. The special high-temperature self-compensating sand pump, flexible metal pump, and high-temperature resistant ceramic pump series are selected to meet the requirements of the steam drive production process and are heavy oil. The large-scale development of steam flooding provides protection.
After entering the wellbore, the pressure is reduced and flashing occurs. When the liquid is sucked into the pump chamber, the pressure is further reduced and flashing occurs again. Flashing twice produces a large amount of water vapor, which greatly increases the air lock during the operation of the pump and makes the pump unable to work properly.
3 Severe sand production in the oil layer. Poor anti-jamming capability of ordinary pumps The oil-bearing formation is in a state of steam flushing and high temperature for a long time, and the original stratum structure changes. At the same time, the production of steam drives requires higher liquid production speeds, so as to reduce the pressure at the bottom of wells to increase production pressure differentials and improve the production efficiency of steam drives. The increase of pressure difference in production will increase the flow rate of steam in the oil layer, and the effect of high-temperature steam flushing oil layer will increase, which will easily cause the sandstone particles in the oil layer to fall off. The particles after shedding will move with the fluid to the wellbore, causing serious sand production in the oil well. Pump cycle shortened.
4 Block S content is high, and ordinary pumps have poor corrosion resistance. The oil in the Qi 40 block contains sulfur components. HS gas is easily generated under high temperature and high pressure conditions in the steam drive. The presence of HS causes the corrosion of key components of the pump and the corrosion reaction rate. Accelerate with increasing temperature. According to relevant statistics, the chemical reaction rate increases by approximately 1 to 2 times the original rate for every 10°C increase in temperature.
In general, the pump cylinder and the plunger of an ordinary oil pump are conventionally processed, and there are many capillary pores. The etching liquid can easily invade the plating layer or the spray coating layer, and finally the base iron under the plating layer is eroded and corroded. , Plating off leads to card pump.
Second, the special pump technology principles and technical characteristics For the above-mentioned problems in the development of the steam drive, launched a suitable steam drive production of special oil pump research, testing and optimization work. Great improvements have been made in the structural design and material selection of the oil pump, and special high-temperature self-compensating sand pump, flexible metal pump, high-temperature ceramic pump and other special oil pump series have been selected, effectively solving the high temperature of the oil pump. Deformation, corrosion, card pumps, steam locks, and low pump efficiency.
1High-temperature self-compensating sand carrying pump 11 Structure Qi 40 is the main block of heavy oil production in the Huanxiling Oil Production Plant. Since its development in 1987, after nearly 20 years of conventional throughput mining, the production has entered a stage of rapid decline. The discomfort way of handling should be to stabilize production and increase production. In order to further improve oil recovery, a steam flooding pilot test was carried out in four well groups in this block in October 1998. In 2003, another seven well group steam flooding expansion tests were conducted. At the end of 2006, steam drive production began. stage. At present, the steam flooding pilot test in this block has been successful. The expansion test is progressing in a good direction. The industrialization test has fully entered the implementation phase. Because steam flooding requires continuous injection of high-temperature and high-pressure steam into the reservoir for a long time, the working environment of the pump at the bottom of the well is quite complicated. The normal pumping pump often causes sanding, wear and corrosion in the production process, which causes the pumping efficiency of the pump to rapidly decline. The shortened life span results in frequent oil well pump inspections. Conventional rod pump technology has become a bottleneck restricting steam drive production technology.
I. Main problems and causes of common oil pump in the development of steam flooding 1 High oil layer temperature, poor heat resistance of ordinary pump The pump barrel of an ordinary pump is generally made of carbon structural steel, and the surface is hardened. Surface spray-welded nickel-base alloy or chrome plated. Due to the high temperature of the oil layer, common parts of the oil pump are prone to high temperature deformation. Because of different materials, the linear expansion coefficient is different. In addition, the cross-sectional dimensions of the pump cylinder and the plunger are different. This will cause irregularity and non-identity in the direction of the deformation of the pump, resulting in failure of the moving parts and sealing components of the pump. , Reduce the pump efficiency, increase the card pump chance.
2 Normal pump steam lock phenomenon is serious. After the high-temperature fluid in the formation with low pump efficiency enters the wellbore, due to the pressure drop, the corresponding water saturation temperature decreases, and the sensible heat of some water turns into the latent heat of water vapor, which rapidly vaporizes. This phenomenon is called flash evaporation. . Under the condition of steam flooding, the formation temperature is relatively high, and the formation fluid drilling and drilling process in May 2008 mainly consists of a fixed plunger, a moving pump cylinder, a metal seal ring, a sand separation device, a metal slotted screen pipe, a grit tail pipe, etc. A few parts.
1.2 Technical Principles During upstroke, the pump cylinder moves upwards with the sucker rod and the pump cylinder moves to close the valve. The liquid in the oil well passes through the metal slotted screen to enter into the pump cylinder and the plunger. The plunger is fixed and the valve opens. The liquid in the oil well enters the pump chamber to achieve the oil inlet process.
Under the downward stroke, the pump barrel moves downwards with the sucker rod, the upstream valve of the pump cylinder is opened, the plunger is fixed on the valve, the liquid and sand particles in the pump chamber enter the oil tube, and the technical characteristics of the oil discharge process 1.3 are fixed. Plunger pump cylinder structure, so that the sand can not be deposited in the pump cylinder; plunger is equipped with a metal seal ring to achieve automatic scaling to adapt to changes in the inner diameter of the pump tube to avoid high temperature card pump; 4mm laser slitting, can effectively large diameter The grit is blocked outside the pump; the grit sanding device in the pump can settle the small-diameter grit into the grit column without making the grit between the piston and the pump cylinder, which can effectively avoid the card pump; the structure of the anti-draining pipe is simple , With the pump outside the sand, the pump sand, the plunger is not easy to sand card, the advantages of sand buried; 2 flexible metal pump 21 structural composition of the flexible metal pump in structural design and the general pump is completely different, it consists of a pump tube, sealed section , Center rod, compression sleeve, floating seat, hemisphere, guide block, fixed Vernier ball, fixed Verr seat and other parts. The plunger structure is in the form of a soft seal, strong opening and closing, can effectively prevent steam lock, and also has good sand resistance.
22 Working principle In the up stroke, the plunger fixing assembly (center rod, hemisphere, guide block) is up, and the floating valve seat is in contact with the hemisphere to form a multi-stage seal and drives the floating ring assembly (seal section, pressure sleeve and floating seat). Therefore, a multi-stage seal is formed between the seal section and the pump cylinder to form a pumping force, the fixed valve is opened, and the well fluid enters the lower cavity of the plunger in the pump cylinder.
On the down stroke, the plunger fixing assembly (center rod, hemisphere, guide block) descends, the floating ring assembly (seal section, pressure sleeve, floating seat) is relatively on, the floating seat and the hemisphere leave to form a channel, and the fixed valve is closed The well fluid under the plunger passes through the annular flow path between the guide block and the pump cylinder, between the floating valve seat and the hemisphere, and between the press sleeve and the center rod, passes over the single-stage sealing unit, and then enters the oil tube step by step.
23 Technical Features The plunger adopts a completely independent multi-stage sealing unit structure, strong opening and closing, with anti-steam locking function; between the plunger sealing unit and the center rod and the pole is in a free state, the eccentric force of the pole acts on the guide Block, the guide block to withstand partial wear, can effectively eliminate the eccentric wear of the downhole pump sealing unit; single-stage sealing unit uses non-contact elastic gap seal, the seal unit structure is short, not easy to sand card; the upper end of the plunger is designed for acute angle, the largest The limit reduces the possibility that settled sand will enter the seal gap. The diameter of the sand that can enter the seal gap is less than or close to the seal gap value. With the flexible seal gap, the card pump can be effectively avoided.
3 high-temperature ceramic pump 3.1 structural composition High-temperature ceramic pump is mainly composed of pump cylinder, ceramic plunger, inlet valve, high flow valve and other high-efficient valves.
3.2 Working principle High-temperature ceramic pump uses a double-valve double-safety structure on the plunger. The double-moving valve on the plunger uses a carbide-alloy valve and a ceramic valve. The use of carbide valve, the use of its material than the major, the decline in speed, increase the speed of the oil valve closure; the use of ceramic valves, the use of its high temperature, corrosion resistance and wear resistance, improve the pump performance and working life .
3.3 Technical Features High-Temperature Corrosion-Resistant Ceramic Plungers Industrial ceramic new materials are used as the base material of the plunger. Toughening agents are added to the ceramic to increase the strength of the plunger. The valve group adopts a large flow path for efficient valve structure. 14 times the normal pump flow path, greatly reducing the oil inlet resistance of the pump and improving the fullness coefficient of the pump; adopting a leakproof double insurance structure to ensure that the pump can achieve effective sealing in the up and down stroke to prevent leakage and improve pump efficiency. The working life of the pump and the use of a pump chamber decompression device have reduced the phenomenon of steam blow and water hammer in the pump chamber, improved the working status of the plunger and the valve group, and improved the service life of the pump.
III. Analysis of the effect of special pumping applications 1 Typical Well Analysis Qi 40-9-3 is a new well put into operation in 2007. The sand production is serious. After the thermal production, two pump pumps are successively run into the well, producing 2 to 3 days. After the sand card, the oil well can not be produced normally. After entering the high-temperature self-compensating sand pump, the oil well resumes normal production. Up to now, the well has been working continuously for more than 4 months, showing strong sand-resistance performance.
1 map 0 § Tuiqi 40-9-k33 well preparation before and after the change of the contrast curve graph art SB - Bu i (2) Qi 40-9 - 026 well is a production well in the pilot steam drive well group, pump, All flushing was lost, and normal production was performed after entering a flexible metal pump. Before and after the production, the pump was produced after thermal recovery in May 2006. After the production of 137d, the amount of sand check in September 2006 was shown as an example.
9-026 Comparison curve of production and production changes before and after the measures -026 well is a high-temperature steam drive well with a wellhead temperature above 100°C. Before entering the high temperature resistant ceramic pump, the pump was used for general production. After 1604, the pump failed to inspect the pump. After the average pump efficiency was 242%, the average pump efficiency was 552d and the average pump efficiency was 553%. The output was very stable. During the inspection of the pump again, the working parts of the pump were tested and it was found that the ceramic plunger wear was minimal.
2 Results of use Since 2004, the special oil pump has used more than 100 wells in the Qi 40 steam drive group, accumulatively increased oil 1.3X1 (ft compared with the same period to reduce the operation of 85 wells, accumulative effect of more than 100 million, obtained Higher economic benefits.
Field application tests have shown that the steam flooding series of special oil pump has the advantages of novel and reasonable structure design, simple construction technology, and good sand control and anti-seismic performance, and it meets the requirements of steam flooding under large liquid extraction conditions, high temperature, sand production, and strong corrosion. Work requirements such as the high gas content and other complex conditions are fully adapted to the requirements of the steam drive production lifting process.
IV. Conclusion Through the research, application and promotion of special oil pump, a complete set of advanced technologies has been developed to solve the corrosion resistance, high temperature resistance and deformation resistance of pump cylinders, plungers, fixed valve groups and traveling valve groups. Difficulties ensure that the pump is not pumped under high temperature conditions, has a small leakage loss, and is corrosion-resistant. It significantly increases pump efficiency under conditions of high sand content and high oil/gas ratio, prolongs the pump inspection period, and results in severe sand recovery. Normal production satisfies the requirements for lifting technology in high temperature and complex environments under heavy oil vapor flooding conditions.
Plastic hardware including semi-finished plastic accessories, hardware
accessories, sanitary products, door and window spring accessories, screws ,nuts, rubber washer, plastic cover, auto parts, electronic parts, etc., The industrial Assembly Line is to take assemble the semi-finished products into finished products automatically.
Plastic hardware assembly machines in the manufacturing industry(factory assembly line) is widely used, these machine assembly line, such as Spring Assembly Machine, screw Assembly Machine , bottle Cap Assembly Machine,Spray Shattaf Assembly Machine,sanitary assembly machine... these produce machines instead of workers,these assembly automation machines can greatly increase the efficiency of assembly lines for factory.
Assembly Machine For Plastic Hardware
Assembly Machine For Plastic Hardware,Plastic Assembly Machine,Spring Assembly Machine,Screw Assembly Machine,Spray Shattaf Assembly Machine
Dongguan Rener Automation Technologies Co.,Ltd , https://www.rener-automation.com