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Device and method for controlling RWD (reaming while drilling) drilling pressure distribution relationship

A technology of reaming while drilling and weight-on-bit, which is applied in the direction of drill bits, drilling equipment, earthwork drilling and production, etc. It can solve the problem of the difficulty in correctly matching the design of pilot drill bits and reamers, ensuring the safety and stability of reaming operations, The problem of low accuracy

Active Publication Date: 2014-01-01
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

This method involves a single factor and the accuracy rate is not high. Therefore, it is difficult to correctly match the pilot drill bit and reamer required for the design of reaming while drilling.
[0007] In the existing technology, the borehole wall is regarded as a thick-walled barrel subject to internal and external pressure, and the difference in compressive strength of the formation cut by the pilot bit and the reamer while drilling is analyzed, and a ladder effect index that characterizes the above difference is proposed and introduced into the Calculation of weight-on-bit distribution ratio, but this method assumes that the rock cutting power of the reamer while drilling and the pilot bit are the same, and the applicable field is narrow
[0008] In the process of realizing the present invention, the inventor found that the prior art has at least the following problems: the existing drilling tools cannot reasonably adjust the weight-on-bit distribution relationship in the process of reaming while drilling, and there is greater safety in the reaming operation and stability hazards; and there is no effective method to guide the design of the reamer while drilling and the pilot bit to ensure that the weight on bit distribution ratio is within a reasonable range

Method used

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  • Device and method for controlling RWD (reaming while drilling) drilling pressure distribution relationship
  • Device and method for controlling RWD (reaming while drilling) drilling pressure distribution relationship
  • Device and method for controlling RWD (reaming while drilling) drilling pressure distribution relationship

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Embodiment 1

[0048] This embodiment provides a device for controlling the weight-on-bit distribution relationship of reaming while drilling, see figure 2 , the device includes a reamer while drilling 1, a short drill collar 2 and a pilot bit 3, the reamer 1 is connected to the upper end of the short drill collar 2, and the lower end of the short drill collar 2 is connected to the pilot bit 3 At least one reaming tool assembly 11 is arranged on the reamer while drilling 1 , and the diameter of the pilot bit 3 is smaller than the outer diameter of the reamer while drilling 1 when the reaming tool assembly 11 is expanded. The pilot bit 3 is arranged at the lowermost end of the device, and the pilot bit 3 is used to break the formation to form a pilot hole with a smaller diameter; the reamer 1 is installed on the upper end of the drill string of the device, and the expanded The cutting diameter is larger than that of the pilot bit 3, and the reamer 1 expands the pilot hole into a main wellbor...

Embodiment 2

[0053] This embodiment provides a device for controlling the weight distribution relationship of reaming while drilling. The device includes a reamer while drilling 1, a short drill collar 2 and a pilot bit 3. The connection relationship between the drill collar 2 and the pilot bit 3 is the same as that in the first embodiment, and the components and the connection relationship of the reamer 1 of the device are the same as those in the first embodiment or can be implemented Example 1 has reasonable improvement and optimization on the basis of the same function.

[0054] see in conjunction Figure 4 and Figure 5 , the crown of the pilot drill bit 3 is provided with a plurality of pilot blades 31, and between each pilot blade 31 is a return chip groove 32, and the end of the pilot blade 31 is provided with a wear-resistant pad 301, and a plurality of The edge of the same side of the pilot blade 31 is provided with drill cutting teeth 302 , and the wear-resistant pad 301 parti...

Embodiment 3

[0057] The embodiment of the present invention provides a method for controlling the weight-on-bit distribution relationship of reaming-while-drilling, the distribution ratio f w In addition to the geometric area ratio of the pilot hole and the main wellbore, the most important factors are the formation characteristics and the cutting ability of the drilling tool itself. The method includes, according to the Teale rock specific work expression:

[0058] E s = W A + 120 π · Ω · W · T A · v - - - ( 1 )

[0059] In formula (1), E s is the specific work of the rock; W is the weight on bit; A is the cross-s...

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Abstract

The invention discloses a device for controlling RWD (reaming while drilling) drilling pressure distribution relationship, and belongs to the field of drilling equipment. The device comprises an RWD device (1), a short drill collar (2) and a pilot bit (3), wherein the RWD device (1) is connected with the upper end of the short drill collar (2), the lower end of the short drill collar (2) is connected with the pilot bit (3), at least one reaming cutter assembly (11) is arranged on the RWD device (1), and the diameter of the pilot bit (3) is smaller than the outer diameter of the RWD device (1) in the expansion state of the reaming cutter assembly (11). The invention also discloses a method for utilizing the device for controlling the RWD drilling pressure distribution relationship. The RWD drilling pressure distribution relationship can be controlled within the set range through regulating the cutting depth per revolution of the pilot bit and the cutting capability of a seaming device, and the safety and the stability of the reaming process are enhanced.

Description

technical field [0001] The invention relates to the field of drilling equipment, in particular to a device and a method for controlling the distribution relationship of reaming-while-drilling-while-drilling drilling pressure. It can reasonably adjust the weight-on-bit distribution relationship in the reaming-while-drilling process, and improve the safety and stability of the reaming operation. Background technique [0002] In the reaming while drilling process of drilling technology, the distribution relationship between the pressure on bit and the reamer while drilling is one of the parameters that need special attention. If the stick-slip or severe lateral vibration of the drill string occurs, the drilling tool will be damaged prematurely, and the ROP will decrease accordingly. [0003] The weight-on-bit distribution relationship is generally expressed by the ratio of the weight-on-bit of the pilot bit and the reamer while drilling, and it is generally agreed that the wei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/32E21B10/43E21B10/54
Inventor 马汝涛林雅玲王辉任荣权王宏伟纪友哲李显义韩飞贾涛朱英杰王雪卢静耿莉田毅王金宏刘洋
Owner BC P INC CHINA NAT PETROLEUM CORP
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