Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for staged fracturing of well cementation casing string and tool for method

A cementing and fracturing technology, which is applied to wellbore/well valve devices, earthwork drilling, wellbore/well components, etc. It can solve the problem of cementing plugs that are difficult to replace cement slurry, sliding sleeve cementation, separation, etc. The problems such as the failure of section fracturing construction have been solved, and the implementation process has been simplified, the reliability is high, and the success rate of bumping is high.

Inactive Publication Date: 2015-02-11
SHENGLI OILFIELD SHENGJI PETROLEUM EQUIP
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem is that the diameter of the ball seat is constant and becomes smaller from top to bottom, making it difficult for the cementing plug to replace all the cement slurry in the clean casing string, and there is a risk that the sliding sleeve will be cemented by the cement slurry. resulting in staged fracturing failure

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for staged fracturing of well cementation casing string and tool for method
  • Method for staged fracturing of well cementation casing string and tool for method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] The present invention is described in detail below in conjunction with accompanying drawing: the method for staged fracturing of cementing string is: a, according to design, determine the interval that needs to be fractured in the implementation of the well, to determine the required hydraulic variable diameter ball seat sleeve sliding sleeve switch tool (3) the quantity and position; b, from the bottom of the well to the well head, arrange the hydraulic variable diameter ball seat casing sliding sleeve switch tool (3) in the order of small to large diameter after the ball seat is reduced in diameter; c, put the hydraulic pressure The variable-diameter ball seat casing sliding sleeve switch tool (3) is connected in series in the casing string (2) according to the design and goes downhole; d. When the casing is lowered to the designed depth, cement slurry is driven into the well for cementing operation, and the The casing is fixed in the formation (1), and after cementin...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for staged fracturing of a well cementation casing string and a tool for the method. The method and the tool are particularly suitable for implementation of staged fracturing and matched well completion after well cementation in oil-gas well engineering. The method is characterized in that hydraulic reducing ball seat sleeve sliding sleeve switch tools (3) are connected in series in a casing string (2) to descend a well, when the tools go down to the designed depth, cement paste is pumped into the well for well cementation, a sleeve is fixed in a ground layer (1), after well cementation, the sealing sleeves of all the hydraulic reducing ball seat sleeve sliding sleeve switch tools (3) are opened in sequence by colliding rubber plugs, cement paste on the inner wall of the casing string is removed, the pressure is built, the hydraulic reducing ball seat sleeve sliding sleeve switch tools (3) seal ball seats for diameter change, and the diameters of the ball seats are increased from the bottom of the well to the top in sequence, so that ball throwing staged fracturing operation can be carried out. Compared with a similar technology, the method and the tool have the benefits that before colliding, the casing string has a drift diameter which is the same in diameter so as to ensure that the well cementation colliding rubber plugs descend smoothly; cement takes the place of cement paste in the clean casing string, so that the success rate of colliding is high.

Description

technical field [0001] The invention relates to a method for staged fracturing of a cementing pipe string and a tool thereof, and is particularly suitable for carrying out staged fracturing matching well completion construction after well cementing in oil and gas well engineering. technical background [0002] For low-permeability oil and gas reservoirs, shale oil and gas and other unconventional oil and gas, cementing and fracturing is the most common and important completion method for production. Water jet fixed-point fracturing, pumping bridge plug fracturing, etc. The overall fracturing effect is not as good as staged and staged fracturing, and staged and staged fracturing methods such as lower inner tube staged fracturing and pumping bridge plug joint seat fracturing are cumbersome to operate. The current cementing staged fracturing method closest to the present invention is: directly connect the ball seat sliding sleeve switch in series on the casing string at the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): E21B43/26
CPCE21B43/261E21B34/08
Inventor 王建松余金陵任淑琼张端光石凯
Owner SHENGLI OILFIELD SHENGJI PETROLEUM EQUIP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com