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

Cementing technology for 5.5-cun sleeve windowed side drilled slim hole

A sidetracking and cementing technology of window opening, which is applied in wellbore/well components, flushing wellbore, earthwork drilling and production, etc. It can solve the problems of high risk of leakage prevention operation, long period, and high risk of large-sized casing. To achieve the effect of improving the cementing quality

Inactive Publication Date: 2015-10-07
SINOPEC EAST CHINA PETROLEUM ENG CO LTD
View PDF7 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the technical problems of sidetracking slim hole cementing with 5.5 inch casing, solve the problems of high risk of leakage prevention operation using downhole cementing tools, high risk of large size casing under reaming, and long cycle time, etc.

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
  • Cementing technology for 5.5-cun sleeve windowed side drilled slim hole
  • Cementing technology for 5.5-cun sleeve windowed side drilled slim hole
  • Cementing technology for 5.5-cun sleeve windowed side drilled slim hole

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] The present invention will be further described in detail below with reference to the examples, but the embodiments of the present invention are not limited thereto.

[0024] The example is Well Side 1-11:

[0025] 1. Well structure data table

[0026]

[0027] 2. Using cement slurry system formula

[0028] Specific gravity of cement slurry: 1.40g / cm 3 , parts by weight: 100 parts of G grade oil well cement (Jiangnan G grade), 18 parts of floating beads, 12 parts of reinforcing agent (ultrafine cement), 3 parts of fluid loss reducing agent (G304), 0.5 parts of drag reducing agent (USZ) , 0.2 parts of retarder (GH-6), 85 parts of water and 2 parts of inorganic fiber (fiber length 6mm);

[0029] 3. Calculation of the critical displacement of plug flow in the well

[0030] 1. Table of rheological properties of cement slurry

[0031]

[0032] 2. Determine the rheological pattern

[0033] B=(φ200-φ100) / (φ300-φ100)=0.26≠0.5±0.03

[0034] Power-law rheol...

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

PropertyMeasurementUnit
lengthaaaaaaaaaa
Login to View More

Abstract

The invention relates to the cementing technology for a 5.5-cun sleeve windowed side drilled slim hole, and the technology is that prepared cement mortar replaces the cementing technology under the condition of small gaps. The cementing technology is characterized in that the cement mortar is prepared by the following components, by weight, 100 parts of G-grade oil well cement, 15 to 25 parts of floaters, 10 to 20 parts of reinforcing agent, 2 to 3 parts of fluid loss additive, 0.4 to 0.8 part of drag reducer,0.2 to 0.4 part of retarder, 75 to 95 parts of water and 1 to 2 parts of inorganic fiber. A method replacing a method about annular plug flow state is provided. The annular hydrostatic fluid column pressure in the cementing technology for a slim hole can be reduced, a leakproof function can be achieved, and defects caused by a thin cement ring can effectively overcome.

Description

technical field [0001] The invention relates to the technical field of oil field cementing and well completion, in particular to a 5-inch half-casing window-opening slimhole cementing process. Background technique [0002] Sidetracking through window opening of oil layer casing is an important means to revitalize abandoned wells and improve oil recovery in old oil areas. However, when the 5.5-inch casing is sidetracked and cemented with a φ88.9mm liner, the cement sheath formed is thin and easily broken due to the small annular space between the casing and the well wall, which affects the sealing. quality. During the cementing process, the return friction on the cement slurry is large, and the equivalent density of the annular space is greatly increased. The formation is often leaked, resulting in low return of the cement slurry; the cementing quality problem seriously affects the follow-up development of the oil well. [0003] With the increase of oil and gas field develo...

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
Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B21/00
Inventor 刘军康闫联国陆长青杜江徐杨贾彦龙李万兴张子强
Owner SINOPEC EAST CHINA PETROLEUM ENG CO LTD
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