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An open-hole whipstock for sidetracking in a horizontal well section

A technology of horizontal well section and deflector, which is applied in wellbore/well components, earthwork drilling, measurement, etc., can solve the problems of poor anchoring reliability and inability to orient the deflector, and achieves high work efficiency and simple structure. Reliable and cost-effective effect

Active Publication Date: 2017-10-03
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

[0006] The purpose of the present invention is to overcome the problems of the prior art that the skewer cannot be oriented in the horizontal section of the open hole and the anchoring reliability is poor, and to provide a skewer specially for sidetracking in the horizontal section of the open hole

Method used

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  • An open-hole whipstock for sidetracking in a horizontal well section
  • An open-hole whipstock for sidetracking in a horizontal well section
  • An open-hole whipstock for sidetracking in a horizontal well section

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Such as figure 1 , Figure 10 As shown, an open-hole skewer for sidetracking in a horizontal well section includes a starting valve 3, a running tool 4, a guide slant 6, an anchor claw 8, and an anchor cylinder 9. The anchor claw 8 is embedded in the anchor In the through hole of the wall of the fixed cylinder 9, the anchor claw 8 is fixed on the inclined plane body 17 arranged inside the anchor cylinder 9 through the shear nails 18, and the upper end of the anchor cylinder 9 is connected with the guide inclined body 6, and the guide guide The italic body 6 is provided with a dovetail groove 14, and the feeding tool 4 is provided with a trapezoidal platform 13, and the leading italic body 6 is connected with the feeding tool 4 through the cooperation of the dovetail groove 14 and the trapezoidal platform 13, and is fixed with the shear nail 5; The upper end of the tool 4 is connected with the starting valve 3 .

[0036] The starting valve 3 used above is a known techn...

Embodiment 2

[0039] On the basis of Example 1, such as figure 2 ,, Figure 6 , Figure 8 As shown, the upper end of the anchoring cylinder 9 is provided with a convex joint 16, and the lower end of the guide bevel body 6 is provided with a female joint 12. The anchoring cylinder 9 and the guide bevel body 6 are connected with the female joint 12 through the convex joint 16 with the shaft pin 7, and the female joint There is a gap 15 between the end of 12 and the bottom of male connector 16 . With this connection structure, the open-hole skewer used for sidetracking of the horizontal well section can be anchored and the skewer can be rotated to the back at a certain angle under the extrusion of the drill bit, so that the top of the skewer can lean against the well wall, which can greatly improve the skewer. The stress condition of the guide slope is eliminated, and one end of the guide slope is fixed, and the other end is suspended in the air, which is similar to the harsh stress state o...

Embodiment 3

[0041] On the basis of Example 2, combined with image 3 , Figure 8 As shown, the bottom of the male connector 16 is provided with a first step 10 . The position of the first step 10 is on the side of the front side of the bias guide body 6. Since the guide skew body 6 and the anchor cylinder 9 are connected by the pivot pin 7, the guide skew body 6 will rotate relative to the anchor cylinder 9, and pass through the first step 10. The function can prevent the leading slope body 6 from falling to the front, which is beneficial for the drill bit to enter the forward position of the leading slope body, and improves the reliability of sidetracking.

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Abstract

The invention belongs to the technical field of petroleum drilling, and specifically relates to an open-hole skewer for sidetracking in a horizontal well section, which includes a starting valve, a running tool, an inclined body, an anchoring claw, and an anchoring cylinder. The anchoring claw is embedded in a In the through hole of the wall of the anchoring cylinder, and the anchor claw is fixed on the inclined plane body provided inside the anchoring cylinder through shear nails, the upper end of the anchoring cylinder is connected with the guide inclined body, and the guide inclined body is provided with a dovetail groove , the feeding tool is provided with a trapezoidal platform, and the guide inclined body and the feeding tool are connected through the dovetail groove and the trapezoidal platform, and are fixed with hand scissors; the upper end of the feeding tool is connected with the starting valve. It solves the problems of difficult orientation and anchoring of the sidetracking skewer in the open-hole horizontal well section, and has the advantages of simple structure, high working efficiency, safety and reliability.

Description

technical field [0001] The invention belongs to a skewer used in drilling operations in the petroleum industry, in particular to an open-hole skewer for sidetracking in a horizontal well section. Background technique [0002] During the drilling of the horizontal section of a horizontal well, mudstone or coal seams are often encountered. At this time, it is necessary to implement sidetracking in the horizontal section of the open hole to find sandstone formations. [0003] To implement sidetracking in the open-hole horizontal well section, the common method at present is to drive cement plugs and use screw drilling tools to slide and open windows to sidetrack. However, in the field construction, the sidetracking period is often prolonged or even sidetracking fails due to poor quality of cement plugs. The operating cost is greatly increased. Another method of sidetracking in the horizontal section of the open hole is to rely on the skewer to open the window. This method is si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/022
Inventor 胡东锋魏小房叶文勇吴光
Owner BC P INC CHINA NAT PETROLEUM CORP