Leak stopping mud bearing high pressure and used for fractured leakage

A plugging slurry and high pressure technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of high risk, difficult adjustment of pressure balance, complex construction, etc., to overcome high risk and pressure The effect of strong ability and low risk

Inactive Publication Date: 2014-07-02
CHINA PETROLEUM & CHEM CORP +1
View PDF1 Cites 27 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical plugging has a good plugging effect on malignant leakage, but the chemical plugging reaction is more intense, the construction is complicated, and the risk is higher
[0003] At present, the pressure bearing capacity of most lost circulation agents is not high. When drilling in formations with high formation pore pressure, narrow safe density window, and multiple sets of pressure systems in the same open-hole section, the pressure balance is extremely difficult to adjust, which may easily cause leakage formations. Repeated leakage brings great difficulties to construction and seriously affects the progress and speed of exploration and development

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 2% by weight of sulfonated asphalt, 3% by weight of drilling fluid non-permeable fluid loss reducer for oil drilling, 5% by weight of plugging fiber, 2% by weight of cross-linked viscosifier Proppant, 3% by weight high-strength proppant is added to 4% bentonite slurry and stirred at high speed, mixed evenly, and prepared into the high pressure-bearing plugging slurry for fracture leakage. Among them, the plugging fiber is prepared from peanut shell powder and sawdust at a weight ratio of 2:5. The peanut shell powder accounts for 30% of the above 20 mesh and 70% of the below 20 mesh; 75% of the sawdust above 10 mesh , less than 10 mesh accounts for 25%. The cross-linking viscosifier is made of water-soluble phenolic resin cross-linking agent and polyacrylamide dry powder in a weight ratio of 3:1. The high-strength proppant is made of walnut shells with a particle size of 5-15 mesh. , Elastic graphite, and rubber particles are formulated at a weight ratio of 5:2:2. The p...

Embodiment 2

[0022] 4% by weight of sulfonated asphalt, 5% by weight of drilling fluid non-permeable fluid loss reducer for oil drilling, 3% by weight of plugging fiber, 5% by weight of cross-linked viscosifier Proppant, 7% by weight high-strength proppant and 7% bentonite slurry were stirred at high speed, mixed evenly, and prepared into the high-pressure-bearing plugging slurry for fracture loss. Among them, the plugging fiber is prepared from peanut shell powder and sawdust at a weight ratio of 1:3, 40% of peanut shell powder above 20 mesh and 60% of below 20 mesh; 60% of sawdust above 10 mesh and 10 mesh The following 40%, the cross-linking viscosifier is composed of organoaluminum cross-linking agent and polyacrylamide dry powder in a weight ratio of 5:2, and the high-strength proppant is composed of walnut shells, elastic graphite, and rubber particles with a particle size of 5-15 mesh. Formulated according to the weight ratio of 4:1:1. The pressure bearing capacity evaluation exper...

Embodiment 3

[0027] 2% by weight of sulfonated asphalt, 3% by weight of drilling fluid non-permeable fluid loss reducer for oil drilling, 3% by weight of plugging fiber, 3% by weight of cross-linked viscosifier Proppant, 6% by weight high-strength proppant and 5% bentonite slurry were stirred and mixed evenly to prepare a high-pressure-bearing plugging slurry for fracture loss. Among them, the plugging fiber is prepared from peanut shell powder and sawdust at a weight ratio of 1:3, 35% of the peanut shell powder is above 20 mesh, and 65% is below 20 mesh; 60% of the sawdust is above 10 mesh, and 10 mesh The following 40%, the cross-linking viscosifier is composed of organic phenol cross-linking agent and polyacrylamide dry powder in a weight ratio of 3:1, and the high-strength proppant is composed of walnut shells, elastic graphite, and rubber particles with a particle size of 5-15 mesh. Formulated according to the weight ratio of 4:1:1. The pressure bearing capacity evaluation experiment...

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
particle size (mesh)aaaaaaaaaa
particle size (mesh)aaaaaaaaaa
particle size (mesh)aaaaaaaaaa
Login to view more

Abstract

The invention provides a leak stopping mud bearing high pressure and used for fractured leakage. The leak stopping mud comprises base mud, asphalt, an impervious filtrate loss reducer for a drilling fluid and a petroleum drilling well, a leak stopping fiber, a cross-linking tackifier and a high-strength propping agent. The leak stopping mud is composed of, by weight, 2 to 4% of sulfonated asphalt, 3 to 5% of the impervious filtrate loss reducer for the drilling fluid and the petroleum drilling well, 3 to 5% of the leak stopping fiber, 2 to 5% of the cross-linking tackifier and 3 to 7% of the high-strength propping agent, with the balance being the base mud, wherein the base mud is 4-7% bentonite mud. The leak stopping mud has a good leak stopping effect on fractured leakage of a complex gas field and can effectively improve stratal bearing capability, widen a drilling fluid safe density window and reduce repetitive leakage of plugging layers.

Description

technical field [0001] The invention relates to the field of plugging slurry for drilling fluid loss, in particular to a high-pressure plugging slurry for fractured leakage. Background technique [0002] Lost circulation is a common problem in the drilling process, which may cause downhole complex situations and major accidents such as well collapse, pipe sticking, and blowout. At present, the commonly used methods of plugging are mainly bridging plugging and chemical plugging. Bridging plugging is characterized by low cost and wide application, but its plugging success rate is low. The reason is that the bridging plugging material itself has poor deformability during the plugging process, and it is slightly larger than the pores and cracks of the leaking layer or is in contact with the pores of the leaking layer. Particles that do not match the shape of the cracks are not easy to enter, forming accumulations on the surface of the leakage layer, and do not penetrate in...

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): C09K8/42
CPCC09K8/426C09K2208/04C09K2208/08C09K2208/18
Inventor 刘振东唐代绪刘从军侯业贵高杨刘国亮
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap