Shaft-bottom negative pressure generator for drilling
A negative pressure generator and drilling technology, which is applied in wellbore/well components, earthwork drilling, flushing wellbore, etc. It can solve the problems of complex ground equipment, strong drilling hydraulic pressure at the bottom of the well, and slow drilling speed, and achieve simple structure , less investment, low cost effect
Inactive Publication Date: 2012-12-05
YANSHAN UNIV
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Problems solved by technology
Although these drilling technologies have effectively increased the rate of penetration, there are also problems such as complex ground equipment, difficulties in wellbore stability and formation pressure control.
[0003] The conventional drilling technology using liquid mud as the circulating medium has the advantages of relatively simple equipment, good well wall stability, easy well control, and light drill string wear, but it also has the disadvantages of strong bottom drilling hydraulic pressure and slow drilling speed
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[0018] exist figure 1 In the schematic diagram of the bottom hole negative pressure generator for drilling shown in the diagram, the upper end of the central shaft 1 is connected to the upper female joint 2, and the lower end is connected to the lower male joint 11, and a thrust shoulder is provided on the upper part of the central shaft 4. The upper female joint is used to connect with the upper drill string, and the lower male joint is used to connect with the drill bit or the lower drill string. A rubber barrel installation ring 6 is sleeved on the outside of the central axis, and a rubber barrel 10 is arranged outside the rubber barrel installation ring. A low-pressure chamber 13 is arranged in the rubber barrel, and a liquid flow discharge hole 12 is arranged on the top of the low-pressure chamber. A nozzle 14 and a low-pressure liquid flow pipe 15 are arranged below the low-pressure chamber, and a filter screen 16 is arranged at the lower end of the low-pressure liquid f...
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The invention discloses a shaft-bottom negative pressure generator for drilling. The shaft-bottom negative pressure generator for drilling mainly comprises a tubular centre shaft and a glue barrel, wherein the upper end of the centre shaft is connected with an upper female joint; the lower end of the centre shaft is connected with a lower male joint; a thrust shoulder is arranged on the upper part of the centre shaft; a glue barrel installation ring is sleeved outside the centre shaft; the glue barrel is arranged outside the glue barrel installation ring; a low pressure cavity is arranged inside the glue barrel; a liquid flow discharge hole is arranged on the upper surface of the low pressure cavity; a nozzle and a low pressure flow tube are arranged on the lower surface of the low pressure cavity; a filter net is arranged on the lower end of the low pressure liquid flow tube; a liquid flow hole is arranged on the centre shaft inside the glue barrel; the glue barrel installation ring and the glue barrel are also provided with liquid flow holes close to one side of the centre shaft; a sealing ring is arranged between the centre shaft and the glue barrel installation ring; a thrust bearing is arranged above the glue barrel installation ring; and a spring is arranged above the thrust bearing. The shaft-bottom negative pressure generator for drilling has simple is structure, stabile and durable, and is suitable for drilling a hard ground layer and an extremely hard ground layer; and with the adoption of the shaft-bottom negative pressure generator for drilling, the pressure intensity of a shaft-bottom drilling fluid can be effectively reduced.
Description
technical field [0001] The invention relates to a negative pressure generator in the mechanical field, in particular to a bottom hole negative pressure generator used for oil, natural gas and geological drilling. Background technique [0002] In the process of oil, natural gas and geological drilling, the holding effect caused by the strong drilling hydraulic pressure in the wellbore greatly reduces the drilling speed. The stronger the bottom drilling hydraulic pressure, the slower the drilling speed; the smaller the bottom drilling hydraulic pressure, the higher the drilling speed. In order to increase the drilling speed, underbalanced drilling technology, air drilling technology, foam drilling technology and gas drilling technology are adopted. Although these drilling technologies have effectively increased the rate of penetration, they also have problems such as complex ground equipment, difficulties in wellbore stability and formation pressure control. [0003] The con...
Claims
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Inventor 李子丰
Owner YANSHAN UNIV