Solidifiable flow sand bridge plugging method for shaft of oil and gas well

A wellbore, oil and gas technology, applied in the fields of fracturing and workover operations, can solve the problems of long operation period, prone to stuck pipe, and limited number of isolation sections, so as to reduce the number of trips and reduce the risk of being stuck Risk, the effect of increasing the number

Active Publication Date: 2013-12-04
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. The risk of entering the well is high, and pipe sticking is prone to occur;
[0008] 2. The number of isolation sections is limited, for example, the number of isolation sections of the packer in the 139.7mm tubing is mostly within 8 sections;
[0009] 3. The operation cycle is long, such as the bridge plug isolation tool needs to perform multiple tripping operations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The best implementation mode of the present invention is: 5% by volume of solidified particles, 25% by volume of quartz sand and 70% by volume of carrier fluid are mixed on the ground and injected into the wellbore, and the mixed fluid is transported to the perforation section The carrier fluid is heated to 50°C by the formation to reduce its viscosity, and then leaks into the formation. The curable particles are cemented and solidified together with the quartz sand under the action of a temperature greater than 50°C and a pressure greater than 20MPa to form a high-strength solid. Blockage of the wellbore at the shot section;

[0032] The curable particles are a mixture of 50% calcium carbonate, 38% low-density filler, 10% rosin and 2% urotropine in mass ratio.

[0033] The carrier liquid is based on the mass ratio, consisting of 2% of 2% of 2% of oleamidopropyl-2,3-dihydroxypropyl dimethyl ammonium chloride C 26 h 53 o 2 NCl, 0.4% KCl and 97.6% H 2 A mixture of O. ...

Embodiment 2

[0037] As another preferred embodiment of the present invention, the curable particles that are adopted are in terms of mass ratio, consisting of 40-60% calcium carbonate, 30-46% low-density filler, 5-15% rosin and A mixture of 1-3% urotropine; the carrier fluid used is based on mass ratio, consisting of 1-3% 2% 2% chlorinated oleamidopropyl-2,3-dihydroxypropyl Dimethyl ammonium C 26 h 53 o 2 NCl, 0.2-0.6% KCl and 96.6-98.6% H 2 A mixture of O. All the other are with embodiment 1.

Embodiment approach

[0039] As another preferred embodiment of the present invention, its steps are as follows:

[0040] Step 1: Perforating the bottom (or lower) layer / section of the target layer for fracturing stimulation of oil (gas) wells (casing completion vertical / horizontal wells);

[0041] Step 2: Carry out fracturing operation on the perforated section;

[0042] Step 3: Add sand to the fracturing operation, use the carrier fluid to carry the mixture of curable tiny particles and quartz sand to replace (sand carrier fluid), the ratio of carrier fluid to curable tiny particles and quartz sand (2-8% by volume curable particles, 20-30% by volume of quartz sand and 60-80% by volume of carrier liquid), the curable tiny particles and quartz sand are sent to the perforation section, and the overall dosage depends on the perforation section depends on the wellbore volume;

[0043]Step 4: Inject clean water into the wellbore with a displacement less than the fracture opening pressure, and stop th...

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PUM

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Abstract

The invention discloses a solidifiable flow sand bridge plugging method for a shaft of an oil and gas well, and relating to the technical field of fracture reconstruction work and rework operation used in petroleum extraction. 2-8 percent by volume of solidifiable particles, 20-30 percent by volume of quartz stand and 60-80 percent by volume of carrier fluid are mixed on the ground and then injected into the shaft; the mixed fluid is conveyed to a perforated interval; after the carrier fluid is heated and becomes less viscous by a stratum, filtrate enters the stratum; the solidifiable particles are cemented and solidified with the quartz sand under the effects of temperature and pressure to form high-strength solid so as to realize plugging of the shaft at the perforated interval. By using the method, pipe column trip is not required, and the operation risk caused by pipe column trip is avoided; the number of isolated intervals is not limited, so that an infinite series of layered/interval reconstruction operation can be theoretically realized.

Description

[0001] technical field [0002] The invention relates to the technical field of fracturing reconstruction operation and well workover operation used in oil exploitation, in particular to a wellbore plugging method for oil and gas wells. Background technique [0003] There are multiple production layers in an oil / gas well, and there are multiple production sections in a horizontal well. During the stimulation operation, the production layer / section at the bottom is operated first, and then the operated layer / section is sealed and isolated. Go up and back in turn, and finally realize the joint production and development of multiple layers / sections in the same well. [0004] At present, the method of isolating the operated layers / sections in stimulation operations is mainly the mechanical tool isolation method, and the mechanical tools used include packers, bridge plugs, and hydraulic jet tools. [0005] For example, the publication number is CN103184850A, and the Chinese ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13
Inventor 任雁鹏马托蒋文学苏伟东柴巧玲
Owner BC P INC CHINA NAT PETROLEUM CORP
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