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Full-bore infinite-order fracturing well completion assembly and technological method thereof

A full-bore, infinite-stage technology, applied in wellbore/well components, earthwork drilling, wellbore/well valve devices, etc., can solve complex procedures, failure of sliding sleeves to open normally, missing fracturing intervals, etc. To solve the problem, achieve the effect of simple process, meet the requirements of selective water control production or secondary fracturing construction, and improve fracturing efficiency

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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  • Full-bore infinite-order fracturing well completion assembly and technological method thereof
  • Full-bore infinite-order fracturing well completion assembly and technological method thereof
  • Full-bore infinite-order fracturing well completion assembly and technological method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0059] refer to figure 1 , Figure 1a' , Figure 1b' , figure 2' , Figure 2a , image 3 and Figure 3a As shown, the full-bore infinite-stage fracturing completion assembly includes the fracturing completion sleeve and the opening tool for opening the fracturing completion sleeve. Wherein, the fracturing completion sliding sleeve includes a fixed outer sleeve 3-1 and an inner sliding sleeve 3-3 connected to the inner wall of the outer sleeve 3-1 through shear pins 3-5, the outer sleeve 3-1 and the inner sliding sleeve 3-3 Positioning pieces 3-6 are also arranged therebetween. Among them, sandblasting holes 3-4 (6-10 evenly distributed) and 2 positioning grooves 3-8 connected with the inner cavity are arranged on the outer casing 3-1, and a closing recess is arranged on the upper part of the inner sliding sleeve 3-3. The groove 3-2 is provided with an opening groove 3-7 at the lower part, and a plurality of sealing elements 3-9 are provided in the middle. The overcoat...

Embodiment 2

[0075] refer to figure 1 , Figure 1a , Figure 1b , figure 2 , Figure 2a and Figure 2b As shown, as a preferred embodiment, it is basically the same as Embodiment 1, except that the opening groove 3-7 includes a guide opening 3-13, a slider groove 3-11 and a guide groove 3-12. Wherein, the guide opening 3-13 is tapered and is connected with the slider groove 3-11 and the guide groove 3-12, the slider groove 3-11 cooperates with the opening slider 13-6, and the guide groove 3-11 is matched with the opening slider 13-6. 12 cooperates with guide key 13-8. 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 provided between the connector 13-7 and the tool lower joint 13-9, and a plurality of guide keys 13-8 extending from the outer surface of the...

Embodiment 3

[0083] 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 has an inclination angle α, and the inclination angle α is 0-60°.

[0084] There are multiple first seals 3-9, the first seal 3-9 and the second seal 13-3 are rubber sealing rings, and the first seals 3-9 are respectively arranged on the sandblasting holes 3-4, shear Between the pin 3-5 and the positioning piece 3-6. The positioning members 3-6 in each embodiment are elastic positioning members.

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Abstract

The full-bore infinite-order fracturing well completion assembly comprises a fracturing well completion sliding sleeve and an opening tool used for opening the fracturing well completion sliding sleeve, the fracturing well completion sliding sleeve and the opening tool have multiple sequence combinations through a matching structure of a specific sliding block and a groove, and it is guaranteed that staged fracturing stages are not limited; according to the opening mode, one-key one-opening of the fracturing well completion sliding sleeve at any fixed point can be achieved, and one-key multi-opening of the first-stage multi-cluster fracturing well completion sliding sleeve can also be achieved. After pressing, the tool is opened and can be completely dissolved, so that the full bore of a well completion pipe string is realized; the continuous, rapid, large-scale, multi-stage and multi-cluster fracturing well completion construction requirements are met, and the fracturing efficiency is improved.

Description

technical field [0001] The invention relates to a fracturing completion assembly for oil and water wells in the petroleum industry, in particular to a full-diameter infinite-stage fracturing completion assembly and a process method thereof. 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 different stages. Send balls of di...

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 王增林张全胜吕玮张峰李玉宝李娜张连煜田浩然李明
Owner CHINA PETROLEUM & CHEM CORP
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