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A Method for Determining the Size of Hydraulic Oscillator Valve Disc

A technology of hydraulic oscillator and determination method, which is applied in the direction of earth square drilling, vibration drilling, rotary combined drilling drive device, etc., which can solve the problem of not being able to take into account the needs of equipment and downhole well, the accuracy is not high, and there is no theory Basis and other issues

Active Publication Date: 2020-12-15
CNPC BOHAI DRILLING ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the investigation of relevant domestic and foreign literature found that there is no relevant report on the optimization of the valve disc size of the hydraulic oscillator, resulting in no theoretical basis in the optimization process, and the accuracy of the optimization purely relying on experience is not high, and it cannot better take into account the needs of equipment and downhole

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  • A Method for Determining the Size of Hydraulic Oscillator Valve Disc
  • A Method for Determining the Size of Hydraulic Oscillator Valve Disc
  • A Method for Determining the Size of Hydraulic Oscillator Valve Disc

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Embodiment

[0038] Well A is designed to have a well depth of 4000m, and the drilling tool assemblies used in the drilling process are: 30m drill collars with an outer diameter of 17.78cm and an inner diameter of 5.7cm, 180m of heavy drill pipe with an outer diameter of 12.7cm and an inner diameter of cm drill pipe 3790m, the nozzle equivalent area of ​​the drill bit is 12.02cm 2 .

[0039] Drilling fluid properties used: Drilling fluid density 1.25g / cm 3 , The plastic viscosity of the drilling fluid is 45Pa·s.

[0040] The drilling fluid displacement used in the drilling process is 1.8m 3 / min.

[0041] The equipment of the drilling team responsible for Drilling A: 3NB-1000C drilling pump (the rated working pressure of the new pump is 26.6MPa), which has been in service for 3 years; the length of the surface high-pressure pipeline is 20m, and the inner diameter is 8.0cm; the length of the high-pressure riser is 40m, the inner diameter is 8.0cm ; The length of the hose is 35m and the ...

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Abstract

The invention discloses a hydraulic oscillator valve disc size optimization method. Optimization is specifically conducted according to the following six steps that firstly, the quantitative relationships between the hydraulic oscillator pressure loss and the valve disc size as well as between the hydraulic oscillator pressure loss and the drilling fluid displacement are determined; secondly, thequantitative relationships between the hydraulic oscillator valve disc size and the pressure loss as well as between the hydraulic oscillator valve disc size and the drilling fluid displacement are determined; thirdly, the maximum working pressure which can be borne by a drilling pump is determined; fourthly, the system cycle pressure loss of a whole wellbore is determined; fifthly, the hydraulicoscillator maximum pressure loss which can be allowed by field equipment is determined; and sixthly, the hydraulic oscillator valve disc size is determined. According to the hydraulic oscillator valvedisc optimized through the hydraulic oscillator valve disc size optimization method, the requirements of ground equipment can be met, the demand of downhole speed increasing can further be met, and atheoretical basis is provided for optimal field application of a hydraulic oscillator.

Description

technical field [0001] The invention relates to the field of oil and gas drilling, in particular to a method for optimizing the size of a valve disc of a hydraulic oscillator. Background technique [0002] For wells with complex structures such as highly deviated wells and extended-reach wells, due to the large inclination angle, long open hole section, and high friction between the drill string and the well wall, back pressure problems often occur during sliding drilling, which leads to the failure of sliding drilling. ROP is very low. The hydraulic oscillator produces high-frequency axial reciprocating vibration through the drilling fluid flowing through it, so that the frictional resistance between the drill string and the well wall changes from static friction to dynamic friction, thereby reducing frictional resistance and increasing the WOB during sliding drilling. The transmission efficiency effectively improves the ROP of sliding drilling. The size of the valve disc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/24E21B6/00
CPCE21B6/00E21B7/24
Inventor 王建龙柳鹤郑永峰于志强刘学松
Owner CNPC BOHAI DRILLING ENG
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