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Equal-diameter switchable sliding sleeve mechanism and monolayer and multi-cluster cooperated fracturing method thereof

An equal-diameter, sliding-sleeve technology, used in fluid production, earth-moving drilling, wellbore/well components, etc., can solve problems such as large pressure loss, high construction pressure, and inability to achieve single-stage and multi-cluster coordinated fracturing. To achieve the effect of reducing pressure loss and improving construction efficiency

Active Publication Date: 2017-05-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the level difference between the sliding sleeves, a ball of one size can only open the corresponding sliding sleeve. In the limited space downhole, the number of sliding sleeves of the fracturing tool is limited, and only a few layers can be fractured. section, and because the inner diameter of the sliding sleeve is smaller, the pressure loss of fracturing is greater, resulting in high construction pressure, and the current tools cannot realize single-stage and multi-cluster and multi-stage multi-cluster coordinated fracturing operations

Method used

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  • Equal-diameter switchable sliding sleeve mechanism and monolayer and multi-cluster cooperated fracturing method thereof
  • Equal-diameter switchable sliding sleeve mechanism and monolayer and multi-cluster cooperated fracturing method thereof
  • Equal-diameter switchable sliding sleeve mechanism and monolayer and multi-cluster cooperated fracturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] Such as figure 1 , image 3 with Figure 4 As shown, it is an equal-diameter switchable sliding sleeve mechanism of the present invention, which includes a cylindrical spray gun body 1, a number of spray holes are arranged on the circumference of the spray gun body 1, and a nozzle assembly is arranged in the spray hole, and the nozzle assembly includes a nozzle matched with the spray hole A seat 102, the nozzle seat 102 is provided with a nozzle 101, and the outer end of the nozzle hole is provided with a nozzle gland 103. The spray gun body 1 is equipped with a sliding sleeve 2 for sealing each spray hole, the sliding sleeve 2 and the spray gun body 1 are provided with a shear pin 3 in the radial direction, the lower part of the spray gun body 1 is connected with a sealing joint 10, and the sealing joint 10 is provided with a A ball seat carrier 11 that can slide along the inner wall of the sealing joint 10. The ball seat carrier 11 is respectively provided with a fi...

Embodiment 2

[0037] The difference between this embodiment and Embodiment 1 is that a third K-shaped diameter section 10C is provided on the upper side of the abutting portion 10D of the sealing joint and the sealing portion of the ball seat carrier 11. The third K-shaped diameter section 10C The axial distance from the maximum enlarged diameter point to the abutting surface of the abutting portion 10D is equal to the axial center distance from the lower end surface of the ball seat carrier 11 to the second combined ball seat stack 902 . In the sliding sleeve mechanism of this embodiment, when the shearing pin 3 is cut off, the sliding sleeve is opened, and the steel ball 8 is sealed on the second combination ball seat 9A, and when the ball seat carrier 11 slides down to the lower end surface, it abuts against the abutting portion of the sealing joint At 10D, the second combination ball seat just reaches the maximum expansion of the third K-shaped diameter section 10C, the second combinatio...

Embodiment 3

[0039] The method for single-layer fracturing using the equal-diameter switchable sliding sleeve mechanism of Embodiment 1 of the present invention specifically includes the following process:

[0040] 1) Tool assembly: according to the number of fracturing stages, select and connect the switchable sliding sleeve mechanism with equal diameter. This embodiment takes five-stage fracturing as an example for specific description, Figure 5 As shown, along the formation, the lowest layer is the first level, and the upwards are the second level and the third level. Therefore, the upper limit point and The lower limit points are M, m, N, n, O, o, P, p, Q, q, respectively, where the radial pin in the first-stage equal-diameter switchable sliding sleeve mechanism is located at the upper limit of the last descending section of the track groove Point Q; in the sliding sleeve mechanism of the second-stage fracturing layer, the radial pin is located at point P, the upper limit point of the...

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Abstract

The invention relates to an equal-diameter switchable sliding sleeve mechanism and a monolayer and multi-cluster cooperated fracturing method thereof. The equal-diameter switchable sliding sleeve mechanism comprises a spraying gun body, a sliding sleeve is installed in the spraying gun body, and a shear pin is installed on the sliding sleeve and the spraying gun body in the axial direction; a sealing connector is connected with the lower portion of the spraying gun body, a ball seat carrier is installed in the sealing connector, two sets of combined ball seats capable of being opened and closed radially are installed on the ball seat carrier in the axial direction, and a K-shaped variable-diameter section with the radial direction expanding outwards are installed on the inner wall of the sealing connector in the axial direction; an elastic reset mechanism is installed between the ball seat carrier and the sliding sleeve and used for driving the ball seat carrier to reciprocate axially after a throw ball passes through the two combined ball seats; a track groove for limiting reciprocation of the ball seat carrier is formed in the circumference of the outer wall of the sliding sleeve, and the ball seat carrier is connected with the elastic restoring mechanism through a radial pin matched with the sliding sleeve track groove; and an abutting part is installed at the lower end of the sealing connector, a matching section sealed with the lower portion of the ball seat carrier is installed on the upper side of the abutting part.

Description

technical field [0001] The invention relates to the technical field of oil field exploitation, in particular to an equal-diameter switchable sliding sleeve mechanism and a single-layer and multi-cluster cooperative fracturing method for formation fracturing construction. Background technique [0002] Throwing a ball to open the injection port of the sliding sleeve seal is the main method used in staged fracturing in oil and gas fields at present. During the construction, the fracturing balls of corresponding diameters are put in order in order of size, and the pressure is suppressed to cut the pin, open the sliding sleeve, and connect the layers. After the layer has been pressed, the construction layer is fractured, and the ball is thrown to cooperate with the ball seat of the layer to seal the construction layer. Due to the level difference between the sliding sleeves, a ball of one size can only open the corresponding sliding sleeve. In the limited space downhole, the numb...

Claims

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Application Information

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IPC IPC(8): E21B34/06E21B43/26
CPCE21B34/06E21B43/26E21B2200/04
Inventor 钱国全储明来李太伟陈碧波朱一星
Owner CHINA PETROLEUM & CHEM CORP
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