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A packer for volume fracturing of horizontal wells

A volume fracturing and packer technology, applied in sealing/packing, wellbore/well components, earth-moving drilling, etc. The effect of unsealing and reducing the risk of sand trapping

Active Publication Date: 2015-12-16
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

[0003] In order to solve the defect that the packer used in the volume fracturing process of horizontal wells in the prior art cannot realize large displacement pumping, the present invention provides a packer for volume fracturing of horizontal wells, the packer Combined with hydraulic jet tools, it can realize hydraulic sandblasting perforation, inject large displacement into the oil pipe and the oil casing annulus at the same time, or only inject large displacement into the oil casing annulus, and meet the construction displacement of 10m 3 Requirements above / min

Method used

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  • A packer for volume fracturing of horizontal wells
  • A packer for volume fracturing of horizontal wells
  • A packer for volume fracturing of horizontal wells

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The present invention provides a packer for volume fracturing of horizontal wells, with reference to figure 2 As shown, the packer 24 is a cylindrical compression packer, which includes an upper check valve, a reverse circulation channel 17, a rubber cylinder 11 and a mechanical anchoring mechanism 19. The upper check valve includes an upper joint 1, a mandrel 5 and steel ball 3, the upper joint 1 is threaded to the mandrel 5 from the outside, the inner diameter of the lower part of the mandrel 5 is smaller than the upper inner diameter, the steel ball 3 is placed in the mandrel 5, and the diameter of the steel ball 3 is larger than the lower part of the mandrel 5. The inner diameter is smaller than the inner diameter of the upper part of the mandrel 5, so that the steel ball 3 is stuck in the mandrel 5. The upper check valve mechanism can prevent the upper liquid flow of the upper check valve mechanism from flowing downward to ensure the normal perforation operation; at...

Embodiment 2

[0027] As an improvement to the packer described in Example 1, such as figure 1 , image 3 As shown, it also includes a balancing mechanism 18, which is located at the tail end of the mandrel 5 and fits and seals with the outer sleeve 6, including a combined seal group 7 and a lower check valve. The combined seal group 7 is embedded in the mandrel 5 and the outer sleeve. Between 6, can be sealed. The lower check valve is located inside the mandrel 5, including the steel ball 9 and the ball seat 10. The ball seat 10 is embedded inside the mandrel 5, the inner diameter of the ball seat 10 shrinks backward in the middle, and the diameter of the steel ball 9 is smaller than the front of the ball seat 10. The inner diameter of the ball seat 10 is larger than the inner diameter of the rear portion of the ball seat 10, so that the steel ball 9 is stuck in the ball seat 10. The lower check valve mechanism can prevent the liquid in the string from flowing to the lower annulus of the pac...

Embodiment 3

[0031] As an improvement of the embodiment 2, the upper check valve mechanism has a baffle 2 at the end of the core shaft 5 inside the upper joint 1, and the lower check valve mechanism has a baffle at the end of the ball seat 10 inside the core shaft 5. No. 8, the first baffle 2 and the second baffle 8 are provided with through holes along the axial direction. The through hole ensures that the liquid flow can pass through, and the steel ball is blocked by the baffle, and will not flow into the pipe string along with the liquid flow because it is pushed away by the liquid flow.

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Abstract

The invention provides a packer for horizontal well dimension fracturing. The packer is a columnar compression packer and comprises an upper check valve, a reverse circulation channel, a rubber sleeve and a mechanical anchoring mechanism. The upper check valve is matched with the reverse circulation channel to realize simultaneous large displacement injection inside an oil pipe and an oil pipe hohlraum or only large displacement injection inside the oil pipe hohlraum, and the requirement for more than 10 m<3> / min of construction displacement is met. Meanwhile, a balance mechanism enables the packer to conduct large displacement reverse circulation operation in an unblocked state, sand grains inside the packer are taken away by backwash liquor in the backwash process, therefore, the risk of sand blocking inside the whole packer is effectively lowered, and the packer is quickly unblocked beneficially.

Description

Technical field [0001] The invention relates to the field of ultra-low permeability oilfield reservoir reconstruction equipment, in particular to a packer used for volume fracturing of horizontal wells. Background technique [0002] The volume fracturing technology of horizontal oil wells is characterized by large liquid volume, large displacement, and large sand volume, and the construction displacement is all 10m 3 / min above, the pump injection in the tubing does not meet the design displacement requirements at all, and it needs to be injected into the tubing and the annulus of the oil sleeve at the same time, or injected with a bare casing. At present, the packer tool used in volume fracturing technology has no mature products, and can not realize large displacement pump injection. Summary of the invention [0003] In order to solve the defect that the packer used in the volume fracturing process of horizontal wells in the prior art cannot achieve large displacement pumping, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/127
Inventor 隆世明苏敏文韩虎成邓小强宁治军张文李景彬田文超李星星张敏
Owner BC P INC CHINA NAT PETROLEUM CORP
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