With the rapid development of social economy, the demand for natural resources in various industries is also growing, and the same is true for mineral resources. Petroleum, as an important natural resource, is of great significance to the development of industry in various countries. The completion technology of slotted casing is an advanced development technology and an effective means to develop fractured oil reservoirs. Compared with screen casing, it has the characteristics of easy downhole operation, high practicability and low cost. This article will introduce it in detail Advantages of slotted casing.
Completion method and advantages of slotted screen pipe
The slot cavity of composite trapezoidal slot cavity plasma slotted liner is composite trapezoidal slot cavity. Its structure is that each slot from the outside of the pipe to the inside of the pipe is composed of a small-angle trapezoidal slot, a transition arc and a large-angle trapezoidal slot connected in sequence. The angle of the outer layer of the liner is a small micro-trapezoid with a thickness of 2-3mm. Due to the small angle, the wear rate of the liquid flow on the slot mouth is reduced. The trapezoidal slot with a larger angle on the inner layer of the pipe wall can keep the slot cavity unobstructed and has good self-cleaning ability. Slotted screen pipes have significantly improved corrosion resistance and wear resistance. The high-frequency and high-temperature plasma flames ionize and thermally decompose the composite water-based working fluid while cutting the screen pipes. The products of ionization and thermal decomposition react chemically with the metal material on the surface of the cut seam cavity under the action of high temperature and electric field. At the same time, the surface of the cut seam cavity is also heated by the high-frequency plasma flame. The fully welded dead screen pipe forms a hardened anti-corrosion layer with a thickness of 0 on the surface of the seam cavity. The hardness of the hardened layer is more than three times that of the pipe body, which can effectively improve the wear resistance and corrosion resistance of the seam.
The seam cavity has high processing accuracy, the seam width tolerance is ±, the surface is smooth, the roughness is low, and the seam arrangement can be achieved: parallel seams, cross seams and group seam crosses. Slotted screen pipes are used for the following completion methods of vertical wells, inclined wells, horizontal wells, and branch wells: slotted liner completion; open hole gravel packing completion; casing gravel packing completion; external pipe packer liner completion, etc. The oil sand control casing is composed of a base pipe, a fully welded wire screen and a support ring. The base pipe is made of casing or tubing that meets API standards.
Advantages of slotted screens: higher filtration accuracy. High tensile and compressive strength. Can be selected according to customers. High-density gaps, low flow resistance. The gap density is 3-5 times that of ordinary slotted screens, and the flow resistance is low, which is conducive to increasing oil and gas production. The introduction of the most advanced European welding process technology has achieved the best input-output ratio of high efficiency, low cost and large-scale production. The special bridge structure makes it difficult for gravel to block the holes, and has high mechanical strength and water-passing capacity. At the same time, the bridge-type water filter pipe adopts the technology of steel plate punching, which has the advantages of light weight, affordable price, and easy operation of lowering the pipe. We use CNC machine tools to punch holes, and the height of the bridge can be changed according to customer requirements. The galvanized anti-corrosion layer can improve the service life of the water well. Products of any diameter can also be provided, which greatly facilitates customers. The fully welded dead-end screen is a water filter with bridge-shaped holes. It has been widely used in developed countries. Engaged in hydrogeological exploration, drilling, well construction, reservoir dewatering, foundation deep excavation dewatering, geothermal development and utilization, mineral water development and utilization, geothermal air conditioning, damaged well repair, groundwater source water extraction, etc. The Ministry of Geology and Mineral Resources began to introduce and promote it in the 1980s and achieved satisfactory results.
Characteristics of slotted casing
(1) Easy to go down the well
Most of the oil reservoir resource extraction work is carried out underground, which is a major difficulty in development work, because the underground environment is more complex and there are many unstable factors, which will also increase the difficulty of the mining work. Traditional The downhole link of development technology is relatively complicated, which not only increases the related workload, but is also very detrimental to promoting the optimal allocation of resources in the industry. The use of slotted screen technology has improved this situation to a great extent, and is beneficial to the long-term health of the industry. Very beneficial for development.
(2) High applicability
There are many types of geological environments in the world, and the distribution of mineral resources is also relatively complex, which puts forward higher requirements for the adaptability of mining technology. The adaptability of traditional mining technology is relatively low and cannot be promoted in some areas with more complex environments. Scientific and reasonable work, this is also a major advantage of slotted casing technology. The slotted casing has relatively high strength and can withstand certain bending, and its adaptability has been greatly improved.
(3) Lower cost
The resource development process requires a certain cost, and the same is true for the development of oil reservoir resources. However, traditional resource development requires a certain cost, not only in terms of funds, but also in terms of construction personnel. The cost is relatively high. Not only is it not conducive to promoting the optimal allocation of resources in the industry, but it is also not conducive to the long-term healthy development of the industry. Compared with the relatively high price of screen casing, the cost-based technology of slotted casing has improved this to a great extent, because this This technology has strong adaptability and the specific construction process is relatively simple, so the cost is relatively low, which is conducive to the long-term development of the industry.
Introduction to horizontal well slotted casing completion technology:
Compared with vertical wells, horizontal well technology has the advantages of increasing single well productivity, slowing down the intrusion of edge and bottom water, developing special types of oil and gas reservoirs, higher input-output ratio, and reducing offshore oil field development costs. It has become an important part of the world's petroleum industry today. One of the most important aspects of technology, and the use of slotted casing in horizontal wells is a commonly used technology.
Application principle: Horizontal well slotted casing completion technology refers to setting up slotted casing in horizontal well bores to control oil layer production and oil-water ratio, achieve effective oil-water separation, while reducing vertical well pipes and surface equipment, improving oil layer exploitation efficiency.
Advantages and application scenarios:
Improve production efficiency: Horizontal well slotted casing completion technology can effectively control oil layer production and liquid production ratio, improve oil-water separation efficiency, and reduce water production costs.
Reduced surface equipment: Compared with traditional vertical wells, horizontal well slotted casing completion technology can reduce surface equipment investment and maintenance costs.
Applicable to a variety of oil reservoirs: It is suitable for different types of oil and gas reservoirs, including oil and gas reservoirs with different properties such as low permeability, high permeability, and high water content.
Reduce environmental impact: Horizontal well slotted casing completion technology can reduce surface mining facilities and reduce environmental impact.
Horizontal well slotted casing completion technology is of vital significance to the mining of mineral resources in various countries, especially petroleum resources. However, it is necessary to grasp a variety of influencing factors during the specific technology application process. For the industry There is a long way to go.
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