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Multi-cluster flow-limited fracturing strings and fracturing methods for open-hole horizontal wells

A technology for fracturing pipe strings and horizontal wells, which is applied in wellbore/well components, production fluids, and earth-moving drilling, etc., can solve the problems such as the limitation of the number of shots in the number of stimulation sections, and the inability to reform horizontal wells by sections, so as to improve the fracturing performance. The effect of the number of segments

Active Publication Date: 2016-06-29
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 this process, pressure-opened sliding sleeves are firstly used to fracturing the first section of the horizontal well section. Balls need to be thrown through the wellhead to open the sliding sleeves one by one, so as to perform fracturing one by one. Horizontal wells are finely segmented and stimulated

Method used

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  • Multi-cluster flow-limited fracturing strings and fracturing methods for open-hole horizontal wells
  • Multi-cluster flow-limited fracturing strings and fracturing methods for open-hole horizontal wells
  • Multi-cluster flow-limited fracturing strings and fracturing methods for open-hole horizontal wells

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Embodiment Construction

[0025] Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:

[0026] see figure 1 with image 3 , the open-hole horizontal well multi-cluster flow-limiting fracturing string of the present invention includes a casing 8, an oil pipe 9 arranged inside the casing 8, several fracturing construction groups II / III connected to the oil pipe 9 and arranged in sequence, and The last fracturing construction group II is connected to the first fracturing construction group I located at the tail of the casing 8. A hanger 2 and a hydraulic anchor 1 are arranged between the casing 8 and the tubing 9. The first fracturing construction Group I includes a packer 3i, a pressure-opening sliding sleeve 6, a sealing ball seat 7, and a floating shoe arranged in sequence, and the above-mentioned components are connected by tubing nipples. Each of the fracturing construction groups II / III includes Packer 3e / 3a, multi-tuft s...

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Abstract

The invention discloses a multi-cluster current limiting fracturing string of an open hole horizontal well and a fracturing method thereof; the mainly adopted equipment is as follows: a hydraulic anchor, a hanger, an open hole packer, a multi-cluster sliding sleeve, a ball throwing open type sliding sleeve, a pressure open type sliding sleeve, a base sealing ball base and the like. A shaft is sealed through the packer; the multi-cluster sliding sleeve, the ball throwing open type sliding sleeve and the pressure open type sliding sleeve are mounted in packing sections; a first packing section of a horizontal well section is modified through measures by applying the pressure open type sliding sleeve, and then, a sliding sleeve set is controlled through well opening ball throwing to sequentially modify the sections, and finally, spray discharge liquid is emptied, and balls are reclaimed for starting operation. Under the precondition of not increasing ball throwing times of the original fracturing technique, the technology improves the number of staged fracturing sections of the horizontal well exponentially, and facilitates fine staged modification of a longer horizontal well.

Description

technical field [0001] The invention belongs to the technical field of staged fracturing of open-hole horizontal wells, and in particular relates to a multi-cluster flow-limiting fracturing string of an open-hole horizontal well and a fracturing method thereof. Background technique [0002] Open-hole horizontal well staged fracturing technology is a commonly used oilfield stimulation measure, especially suitable for the development of gas reservoirs and fractured reservoirs. In this process, a hanger is used to lower the completion tool string into the horizontal well section, an open-hole packer is used to seal the horizontal section, and the horizontal section of the fracturing operation section is selectively isolated. At the same time, the open sliding sleeve is used to establish the connection between the wellbore and the reservoir Connected, staged fracturing is performed according to the number of fracturing stages, and the complete fracturing operation of the entire ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B43/267
Inventor 冯强何志勇贾红战牛增前李军李青一
Owner BC P INC CHINA NAT PETROLEUM CORP
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