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Casing cementing full-bore infinite stage staged fracturing well completion device and fracturing well completion method thereof

A staged fracturing, full-bore technology, applied in wellbore/well valve devices, wellbore/well components, earthwork drilling, etc. In order to meet the needs of selective water control production or secondary fracturing construction, the process is simple, and the fracturing efficiency is improved.

Pending Publication Date: 2022-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the Chinese patent CN103556971B "full-diameter layered fracturing sleeve for oil and gas well operations" authorized on March 2, 2016 discloses a new type of ball-pitching sleeve that includes a step-type moving mechanism. The technology can realize the function of opening the sliding sleeve step by step by throwing balls of the same size in sequence. In principle, it can realize unlimited stages and maintain the full diameter of all sliding sleeves. The fracturing section is lost due to normal start-up; in addition, since the structure does not involve a sealing mechanism, the fracturing construction is prone to leakage from top to bottom; the starting ball in the later stage of the process still needs to be returned and discharged, and the process is complicated
[0005] In addition, the Chinese patent application CN110905448A "An infinitely graded full-bore fracturing sliding sleeve assembly system" published on March 24, 2020, discloses a series connection through pipelines and one-to-one correspondence with multiple opening mechanisms. The fracturing system of multiple sub-fracturing sliding sleeves can realize that after the fracturing of all intervals is completed, the entire pipe string can be full-diameter without drilling, which is beneficial to later production management. Multi-stage sliding sleeves can be connected in series. Infinite stages are realized, but the positioning elastic part of the opening mechanism in this fracturing sleeve system is prone to plastic deformation in the process of multi-stage fracturing sleeves, resulting in opening failure and loss of fracturing intervals; at the same time, the positioning groove is the upper joint The annular gap between the inner sleeve and the inner sleeve, the selective switch cannot be performed later

Method used

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  • Casing cementing full-bore infinite stage staged fracturing well completion device and fracturing well completion method thereof
  • Casing cementing full-bore infinite stage staged fracturing well completion device and fracturing well completion method thereof
  • Casing cementing full-bore infinite stage staged fracturing well completion device and fracturing well completion method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] refer to figure 1 , Figure 1a' , Figure 1b' , figure 2' , Figure 2a , image 3' , Figure 4 and Figure 4a As shown, the casing cementing full-diameter infinite stage fracturing completion device includes casing string 1, multiple hydraulic casing centralizers 2, and multiple fracturing completion sliding sleeves 3 (according to the The number of stages is determined), differential pressure fracturing completion sliding sleeve 14, long-wing cementing plug 5, bumper seat valve 6 and bottom circulation valve 7. A plurality of hydraulic casing centralizers 2 are multiple and connected to the casing string 1, and a plurality of fracturing completion sliding sleeves 3 are connected to the casing string 1 to form a casing cementing full-diameter infinite stage Staged fracturing completion device, and both ends of each stage of fracturing completion sliding sleeve are equipped with hydraulic casing centralizer 2, differential pressure fracturing completion sliding s...

Embodiment 2

[0089] refer to figure 1 , Figure 1a , Figure 1b , figure 2 , Figure 2a , Figure 2b , image 3 , Figure 4 and Figure 4a As shown, as a preferred embodiment, it is basically the same as Embodiment 1, the difference is that there is a fracturing completion sliding sleeve 3 on each stage of the fracturing completion device, and the opening on the fracturing completion sliding sleeve 3 The groove 3-7 includes a guide opening 3-13, a slider groove 3-11 and a guide groove 3-12. Wherein, guide opening 3-13 is tapered and is connected with slide block groove 3-11, and slide block groove 3-11 cooperates with opening slide block 13-6, and guide groove 3-12 and guide key 13-8 match. Also be provided with connecting piece 13-7 between tool lower joint 13-9 and central pipe 13-4, form for opening slide between connecting piece 13-7 and tool upper joint 13-2 and central pipe 13-4. Block 13-6 carries out the limit groove of radial limit. A pressure cap 13-10 is sleeved betw...

Embodiment 3

[0102] It is basically the same as Embodiment 1, the difference is that there are multiple opening grooves 3-7, which are distributed in a 360° spiral at the lower part of the inner sliding sleeve 3-3, and the opening groove 3-7 is connected with the inner sliding sleeve 3-3. The 3-axis can have an inclination angle α, and the inclination angle α is 0-60°.

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Abstract

The invention discloses a casing well cementation full-bore infinite stage staged fracturing well completion device and a fracturing well completion method thereof. The fracturing well completion device and the fracturing well completion method are suitable for fracturing well completion processes of horizontal wells and vertical wells. The device comprises a casing string, a plurality of hydraulic casing centralizers, a plurality of fracturing well completion sliding sleeves, a plurality of differential pressure type fracturing well completion sliding sleeves, a long-wing well cementation rubber plug, a bump pressure seating valve and a bottom circulating valve, and the hydraulic casing centralizers and the fracturing well completion sliding sleeves are connected to the casing string in a matched mode to form the casing well cementation full-bore infinite stage staged fracturing well completion device. The fracturing well completion sliding sleeve is of a full-bore design, and the opening tool and the fracturing well completion sliding sleeve are matched one by one to complete the sliding sleeve opening action. The staged fracturing stage number is not limited; the one-key one-opening of the fracturing well completion sliding sleeve at any fixed point can be realized, the one-key multi-opening of the one-stage multi-cluster fracturing well completion sliding sleeve can also be realized, the full bore of a well completion pipe string is realized after fracturing, the continuous, rapid, large-scale, multi-stage and multi-cluster fracturing construction requirements are met, and the fracturing efficiency is improved.

Description

technical field [0001] The invention relates to a fracturing well completion device for oil and water wells in the petroleum industry, in particular to a casing cementing full-diameter infinite-stage fracturing completion device and a fracturing well completion method. Background technique [0002] At present, the fracturing and completion technologies used in low-permeability and tight oil reservoirs at home and abroad are mainly divided into two categories: open-hole multi-stage fracturing completion technology and casing cementing multi-stage fracturing completion technology. Its mainstream technology covers ball-sliding sleeve multi-stage fracturing completion, pumping bridge plug multi-stage fracturing completion, etc. [0003] Among them, the ball-sliding sleeve type multi-stage staged fracturing completion technology, whether it is applied in open-hole fracturing completion or casing cementing fracturing completion, is a combination of balls and ball seats with differ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B43/14E21B34/14E21B34/06
CPCE21B43/26E21B43/14E21B34/14E21B34/063
Inventor 张全胜吕玮李玉宝刘玉国李明李娜张建田浩然张连煜
Owner CHINA PETROLEUM & CHEM CORP
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