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A method for remotely closing downhole units on the surface of a rotary steerable system

A rotary steerable well shut-in technology, applied in directional drilling, drilling automatic control system, earthwork drilling and production, etc., can solve the problems that the rotary steerable system cannot realize self-protection and continuous operation, and affect the timeliness of drilling operations, etc., so as to improve the drilling efficiency. Operational timeliness, reduced frequency of tripping inspections, highly targeted effects

Active Publication Date: 2021-11-12
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when an abnormal situation occurs, drilling inspection is required, and the self-protection and continuous operation of the rotary steerable system cannot be realized, which affects the timeliness of drilling operations

Method used

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  • A method for remotely closing downhole units on the surface of a rotary steerable system
  • A method for remotely closing downhole units on the surface of a rotary steerable system
  • A method for remotely closing downhole units on the surface of a rotary steerable system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A method for remotely closing a downhole unit on the ground of a rotary steerable system, comprising the following steps:

[0031] a. Assuming that the diversion ratio of the downlink device is k, the equivalent area of ​​the water eye of the drill bit is s, the total displacement of the mud pump is Q, and the pressure of the standpipe before the down transmission device is started is P, and the pressure difference between the front and back of the water eye of the drill bit is calculated by formula 1 P 1 ;

[0032] P 1 =Q 2 ρ / 2μ 2 the s 2 Formula 1

[0033]Among them, Q is the total displacement of the mud pump, m 2 / s; μ is the flow coefficient, μ=0.63; s is the equivalent area of ​​the drill bit water hole, m 2 ;P 1 is the pressure difference between the front and back of the water eye of the drill bit, unit Pa; ρ is the density of the fluid, Kg / m 3 ;

[0034] b. Calculate the run loss △P by formula 2;

[0035] △P=P-P 1 Formula 2

[0036] c. Calculate ...

Embodiment 2

[0043] A method for remotely closing a downhole unit on the ground of a rotary steerable system, comprising the following steps:

[0044] a. Assuming that the diversion ratio of the downlink device is k, the equivalent area of ​​the water eye of the drill bit is s, the total displacement of the mud pump is Q, and the pressure of the standpipe before the down transmission device is started is P, and the pressure difference between the front and back of the water eye of the drill bit is calculated by formula 1 P 1 ;

[0045] P 1 =Q 2 ρ / 2μ 2 the s 2 Formula 1

[0046] Among them, Q is the total displacement of the mud pump, m 2 / s; μ is the flow coefficient, μ=0.63; s is the equivalent area of ​​the drill bit water hole, m 2 ;P 1 is the pressure difference between the front and back of the water eye of the drill bit, unit Pa; ρ is the density of the fluid, Kg / m 3 ;

[0047] b. Calculate the run loss △P by formula 2;

[0048] △P=P-P 1 Formula 2

[0049] c. Calculate...

Embodiment 3

[0056] A method for remotely closing a downhole unit on the ground of a rotary steerable system, comprising the following steps:

[0057] a. Assuming that the diversion ratio of the downlink device is k, the equivalent area of ​​the water eye of the drill bit is s, the total displacement of the mud pump is Q, and the pressure of the standpipe before the down transmission device is started is P, and the pressure difference between the front and back of the water eye of the drill bit is calculated by formula 1 P 1 ;

[0058] P 1 =Q 2 ρ / 2μ 2 the s 2 Formula 1

[0059] Among them, Q is the total displacement of the mud pump, m 2 / s; μ is the flow coefficient, μ=0.63; s is the equivalent area of ​​the drill bit water hole, m 2 ;P 1 is the pressure difference between the front and back of the water eye of the drill bit, unit Pa; ρ is the density of the fluid, Kg / m 3 ;

[0060] b. Calculate the run loss △P by formula 2;

[0061] △P=P-P 1 Formula 2

[0062] c. Calculate...

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Abstract

The invention discloses a method for remotely closing downhole units on the ground of a rotary steerable system, which belongs to the technical field of oil drilling, and is characterized in that it comprises the following steps: a. Calculate the pressure difference P between the front and back of the water eye of the drill bit 1 ; b. Calculation of the delay loss △P; c. Calculation of the pressure P at the standpipe after starting the downlink device 2 ; d. According to the pressure balance relationship, the pressure drop of the throttle valve of the downlink device is also P 2 , calculate the opening area S of the throttle valve of the downlink device 1 ; e, according to the throttle valve opening and the throttle valve opening area S 1 Adjust the throttle valve to the calculated opening, so that the split flow automatically reaches the set split ratio; through the detected flow change in the underground, it automatically corresponds to the function block that needs to be cut off, and closes the downhole unit. The invention can realize self-protection and continuous operation of the whole rotary steerable system, reduce the frequency of drilling inspection when the rotary steerable system is abnormal, improve the efficiency of drilling operation and reduce the cost.

Description

technical field [0001] The invention relates to the technical field of oil drilling, in particular to a method for remotely closing downhole units on the ground of a rotary steerable system. Background technique [0002] The down transmission device in the rotary steerable system is the key component to realize ground control downhole. Its realization principle is to change the mud displacement into the well by diverting a certain proportion of the drilling fluid in the standpipe, and then send the ground command to the well. Bottom rotation guide tool. Since the rotary steerable tool is powered by a turbine generator, the amount of mud entering the bottom of the well cannot be too small, otherwise it will affect the downhole energy supply. Therefore, the sub-flow of the downlink device needs to be precisely controlled. At this stage, it is mainly adjusted by experience. There are problems of long adjustment time and low accuracy, which affects the timeliness of command del...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/04E21B44/00E21B21/08E21B21/10
CPCE21B7/04E21B44/005E21B21/08E21B21/10E21B47/18E21B34/066E21B43/126
Inventor 白璟张继川陆灯云李雷黄崇君贾利春廖冲韩烈祥张德军唐贵
Owner BC P INC CHINA NAT PETROLEUM CORP
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