The Best Way to Safely Seedlings Overwintering--Drilling Seawater Wells

When winter comes and seawater temperature is lower than 15°C, sea cucumber seedlings companies will need to burn the boilers for heating to ensure the temperature of the nursery room. Under normal circumstances, taking a 2000m2 water sports seedlings enterprise as an example, except for the purchase of boilers, pipes, and heat sinks, only a year for coal burning will cost about 70,000 yuan, which greatly increases the investment cost of the company. In order to reduce expenses, Changdao County of Shandong Province has been trying to use drilled seawater wells to extract the approximately constant-temperature seawater (15°C to 16°C) in the seawater wells for direct supply to nursery ponds in the recent years. (One-time investment after a 70-80m deep seawater well matching About 80,000 yuan), after two years of practice has proved to be a feasible way. However, there is a high technical requirement for drilling seawater wells in the coastal rock and rock areas. The well team of the Water Resources Bureau of the Changdao County, Shandong Province, has drawn up a set of effective experiences in the dozens of seawater wells that have been successfully drilled in the long island cobblestone area in recent years. The processing method. First, the determination of wells in the seawater As the seafaring companies need to use a large amount of seawater, and require water quality and pollution, the water temperature is constant, so the determination of seawater wells is critical, generally using a high rate of determination of the accuracy of the electrical selection method Fixed well location. The instrument used in the water measurement work of the electric measurement method is the DWJ-1A Microcomputerized Electroacoustic Instrument produced by the Beijing Geological Instrument Factory and has good performance. Second, the rock and stone section of the drilling technology treatment along the beach complex underground structure is complex, mostly three millimeters to 100 millimeters in diameter quartzite ballstone, and 80% of the ball below the sea level and soaked in sea water, the Bohai Sea The thickness of the coastal ball stone layer is generally 7 meters. Drilling wells in these complex sections is not feasible with conventional drilling methods and it is difficult to build wells. The reasons are as follows: (1) Manual digging of rock is difficult, because 1.5 meters of digging leads to seawater, and when the depth of seawater exceeds 0.5 meters, manpower cannot be constructed. (2) If the drilling machine is used to drill directly, due to the serious water leakage, the sliding of the ball stone will be large, and the fine sand layer mixed with the ball stone will flow out with water and cause a landslide accident. (3) Construction with cement pipe open caisson will cause artificial settlement due to the size of the ball stone and the high sea water level. There are two ways to deal with the difficulty of drilling in the ball rock area: one is the pressure tube rotation method; the other is the excavation method. 1. Pressure tube rotation method construction The following materials are to be prepared first: (1) 7-meter-long iron pipe with a pipe wall thickness of 3 mm to 4 mm and a diameter of 500 mm (the number of knots is based on the thickness of the earth's stone layer). (2) At the lower end of the first section of the iron pipe, a deep 100 mm, 45-angle herringbone angle is cut with a hacksaw. Its function is to facilitate the saving of force by rotating the iron pipe, and to cut two symmetrically at the upper end of each section of the iron pipe. 80mm deep, 40mm wide groove. (3) A section of channel steel with a length of 550 mm and a width of 80 mm is cut out, and a drill pipe joint with a diameter of 89 mm and a length of 150 mm is welded in the middle. On the other side of the channel steel, a steel bar supporting a supporting iron pipe is welded, and the steel bar having a diameter of 6 mm is lengthened by 1 m, and its role is to control the horizontal displacement of the iron pipe during sinking and maintain its verticality. Pressure tube rotation method operating procedures: (1) Support the derrick at the designated well position, hoist the first section of the iron pipe with a hoist, and put it into the drilling machine turntable; (2) Lift the main drill pipe and do a good job The channel steel is firmly connected with the main drill pipe from the drill pipe joint, and then is screwed into the slot cut at the upper end of the iron pipe in the turntable, so that the steel bar is tightly attached to the inner wall of the iron pipe, and the drill machine is started to utilize the pressure and rotation of the main drill pipe. Force the iron pipe into the goal and then put the main drill pipe and channel steel into the second section of the iron pipe. The two sections of the iron pipe are welded and welded together, and then constructed in the same way. If the ballstone in the iron pipe is full, it can be used to remove the ballstone and sand in the pipe by using a wire-striker or a sand-barrel, and then push it in until the drill bit can drill. After passing through the ball stone layer, another bit is drilled and the well is drilled to the design depth in the normal location. The advantages of this construction method are as follows: First, the iron pipe rotation method is relatively balanced due to the pressure and the rotational force of the iron pipe, and the iron pipe sinks basically vertically; secondly, it can prevent the ball stone layer from collapsing; third, the construction operation is simple and the well completion rate is high. 100%. 2. Excavation under the pipe method in the well location if the terrain is spacious, excavators can also be used to dig a stone ball, excavation size is 15 meters above the mouth, the depth of the ball stone thickness, the lower mouth of 1 meter square hole, Drain the pump with water while digging. According to the depth of the pit, make a metal casing or cement pipe and run it straight down. Then use a ball stone to bury it, level it, and raise the derrick for normal drilling. Drilling wells in complex landforms such as coastal ball-rock areas and using pressure tube rotation method is currently the only feasible method. It overcomes the difficulty of stone ball layer collapse, and the well completion rate is up to 100% with less investment. In exchange for a great deal of economic benefits, a lot of money has been saved for island sea cucumber seedling raising companies.