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In the past three years, this new type of drilling fluid has been widely used in oil fields such as Xinjiang, Liaohe, Jilin and Dagang. The new chemical solid wall technology has effectively shortened the drilling cycle and improved the ROP. The use of "double membrane" cooperative blockage to protect reservoir technology and significantly increase the output of oil wells in multiple oil fields is of strategic significance.
According to incomplete statistics, from 2006 to 2008, the technology promoted the application of 6621 wells and generated direct economic benefits of 5.98 billion yuan. The drilling effect in complex formations was even more pronounced, and the drilling fluid and reservoir protection technologies in China were comprehensively improved at home and abroad. The core competitiveness of the company is of great significance for increasing the production of single wells in oil and gas wells, reducing the cost per ton of oil, and protecting oil and gas resources. At present, the high-end equipment and fine chemical products developed by the project have formed industrial clusters with significant social benefits.
Wellbore instability and reservoir damage have always been international technical problems in the exploration and development of petroleum. In the past, due to the complex geological structure and relatively backward technology, China’s annual direct economic losses due to borehole instability (including well leakage) are estimated to reach With 2.2 billion yuan, indirect losses are even greater. In addition, 80% of drilling in China's oil exploration and development process has serious damage to the reservoir, oil and gas wells have 20% to 30% damage, and the reservoir is heavily polluted.
According to the project scientific research personnel, the main reason for the borehole wall instability and reservoir pollution is that the water in the drilling fluid enters the borehole formation and the oil and gas reservoir. Wellbore instability mainly occurs when water enters the wellbore formation and causes the wellbore wall to collapse. When the reservoir encounters water, it will block the oil circuit, causing reservoir pollution and oil production to decrease. In order to stabilize the wellbore wall and protect the reservoir, it must effectively prevent the liquid phase from entering the formation. At present, physical blocking methods are used mainly at home and abroad to prevent water from entering the formation. However, because of the complicated conditions, the use of physical plugging can not prevent the liquid from entering the formation pores and micro-fractures, which has obvious limitations.
According to reports, there are semi-permeable membrane characteristics on the surface of borehole rocks, but currently there are no mature relevant theories in the world, and there are no supporting products to achieve industrial applications. The project team boldly proposed the use of chemical methods to improve the filming efficiency of the wellbore rock, and at the same time form a barrier film in the oil and gas reservoir. By regulating the osmotic pressure difference between the two sides of the membrane, the formation water flows from the formation to the wellbore, effectively preventing liquid and solid phases. Into the borehole rock and oil and gas reservoirs, so as to achieve the dual purpose of stabilizing the wellbore and protecting the reservoir.
After years of exploration efforts, researchers have developed two new types of film-forming organic materials in combination with molecular structure theory. The organic silicate material can significantly improve the shale membrane efficiency, and the organic amine modified natural fiber polymer material can quickly form a non-porous isolation membrane on the well wall of the reservoir. The two new materials are added to the drilling fluid, and the synergistic effect of the material is used to form a new technology for water-based drilling fluid “double membraneâ€. The effect of film formation and plugging is significant.
This internationally pioneering new technology for the formation of film-forming chemically-solidified walls and reservoirs marks a major shift from a physical plugging method to a physical and chemical plugging method for the stabilization of borehole wall and reservoir protection technology in China, effectively preventing solidification. The phase and the liquid phase enter the stratum and basically solve the technical problems such as borehole wall collapse, leakage, stuck pipe and reservoir damage that are likely to occur under complex conditions. This achievement has been granted 2 national invention patents, 7 utility model patents, 7 published books, 367 papers published, 1 national oil and natural gas industry standard, 7 enterprise standards, and won the China Petroleum and Chemical Industry Association in 2008. Science and Technology Progress Award.
With the development of oil drilling engineering in a deeper, faster, more economical, cleaner, and safer direction, higher demands are placed on drilling fluids, and there is still ample room for development of this technology. In the past 3 years, drilling with the new drilling fluid technology accounted for 7.5% of the total drilling volume in 3 years. Currently, the technology is being promoted to complex formations in foreign oilfields.
The main advantage of the epc
1. The shape of casting size precision, good repeatability, has the characteristics of precision casting;
2. The casting surface finish high;
3. Cancel the sand core and core xiaohong, eliminated due to core, the core of casting defects and waste;
4. Out of box, not modulus, greatly simplifying the molding process, to eliminate the casting defects caused by modulus, tanks and waste;
5. The binder, water, dry sand molding without any additives, eliminated due to moisture, additives and binder caused by all kinds of casting defects and waste;
6. Greatly simplifies the sand processing system, the sand can be repeated use, all cancelled &industry sand preparation and waste sand treating section;
7. Shakeout extremely easy, greatly reduces the shakeout workload and labor intensity;
8. Castings without flash burr, make clear the burnish workload by more than 50%;
9. Can be set up in an ideal position reasonable shape of the riser, is not subject to classification, the restriction of traditional factors such as modulus, reduce the internal defects of casting;
10. Negative pressure casting, is more advantageous to the liquid metal filling and feeding, improved the casting organization density;
11. A combination of pouring, a box, greatly improving the casting craft production rate and production efficiency;
12. Reduce the machining allowance, reduces the machining cost;
13. Automatic assembly line production, easy to realize mechanization production line elasticity, can implement different alloy on a production line, different shape, different size of casting production.
14. You can cancel the draft Angle;
15. The use of metal die life can reach more than 100000 times, reduce the mold maintenance;
16. Reduced the dust, smoke, and noise pollution, greatly improved the working environment of foundry workers, reduce the pain
Dynamic strength, mainly men can become predominantly female industry;
17. Simplified the process operation, on the degree of skilled workers required is greatly reduced;
18. The shape of the parts is not restricted by the traditional casting process, the liberation of the mechanical design workers, to make it according to the using performance of the parts, free to design the ideal shape casting;
19. Can reduce the casting weight;
Reducing the production cost; 20.
21. Simplified the factory design, can reduce 30 ∽ 40% of investment in fixed assets, covers an area of area and construction area
30 ∽ 50%, reduce power consumption can reduce 20%; 10 ∽
22. The epc technology widely used, not only suitable for cast steel, cast iron, more suitable for cast copper, cast aluminum, etc.;
23. The Epc Casting process is not only suitable for simple geometry, more suitable for ordinary casting to attack rolled edge, core, geometric shape of complex castings;
24. The Lost Foam Casting process can realize microtremor state pouring, promote the formation of the special requirements of metallographic organization, to improve the inner quality of casting;
25. Combined on the dry sand casting, easy to take off the sand, temperature, therefore can make use of waste heat to heat
Richard.Especially high manganese steel castings water edge processing and heat resistant steel solid solution treatment, the effect is very ideal, can save a lot of energy, shorten the processing cycle;
26. The use of epc process, can according to melting ability, complete any size castings.
Epc Casting, Lost Foam Casting
QINGYUN HUIHUANG EXACT CASTING CO.,LTD , http://www.sdhhcasting.com