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Novel casing pipe restoration reinforcing agent, preparation method and construction method thereof

A technology of reinforcing agent and casing, which is applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problems of short validity period, low bonding strength, low tensile and compressive strength, etc. Long validity period, wide temperature resistance range and good fluidity

Active Publication Date: 2018-09-18
谢翠娥 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the performance of the cement material itself, its tensile and compressive strengths are low; its bonding strength with the metal casing is poor; after curing, the cement body has low bonding strength, strong brittleness, easy to fall off blocks, poor sealing performance, and short validity period
(2) The expansion tube subsidy casing technology has the advantage of high internal pressure resistance, but the subsidy will cause the casing to shrink, which will affect the lifting of the pipe string and tools during production operations, or affect the sealing of the subsidy due to bumping, Cause repair failure; Secondly, because the subsidy pipe is deformed by pressure, its mechanical stress is greatly reduced, which is easy to cause leakage in the later stage; the use of casing subsidy repair technology cannot effectively inhibit the continued corrosion and perforation in the later stage
Common chemical plugging agents include epoxy resin, phenolic resin and urea-formaldehyde resin, etc., but the strength of this type of plugging agent body after curing is only about 20MPa, and the bonding strength between the resin body and the metal casing after curing is relatively small. After curing, the resin has a certain degree of plasticity and strong compressibility. If the pressure is too high, it is easy to compress and deform or squeeze into the formation, resulting in repair failure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A new casing repair reinforcing agent formula is composed of the following components by mass percentage: E51: 79%, diethylenetriamine: 7.2%, stainless steel powder: 5%, length 0.2mm modified chopped carbon fiber: 3 %, Z-6040: 2%, D310: 0.6%, absolute ethanol: 3.2%. Preparation method: According to the above ratio, in a container with a stirring paddle, under stirring at a speed of 6000r / min, add anhydrous ethanol, E51, stainless steel powder, D310, 0.2mm modified chopped carbon fiber, Z-6040, Add while stirring, and then stir for 5 minutes after adding. Due to the different functions of various raw materials, in order to ensure low viscosity and good fluidity of the product, the order of adding raw materials cannot be changed. According to the above ratio, add diethylenetriamine to the prepared product, mix it and apply it evenly in the hole of the steel plate with a hole diameter of 12mm and a thickness of 5mm, and apply it evenly and compact it to ensure that the re...

Embodiment 2

[0026] A new casing repair reinforcing agent formula is composed of the following components by mass percentage ratio: E51: 77%, triethylenetetramine: 9.6%, nickel alloy powder: 5%, length 1mm modified chopped carbon fiber: 3 %, Z6020: 1.5%, D310: 0.6%, D691: 3.3%. Preparation method: According to the above ratio, in a container with a stirring paddle, under stirring at a speed of 5000r / min, add D691, E51, nickel alloy powder, D310, 1mm modified chopped carbon fiber, Z6020 in sequence, and add while stirring , and then stir for 6 minutes after adding. According to the above ratio, add triethylenetetramine to the prepared product, mix it evenly, and apply it to the hole of the steel plate with a diameter of 10mm and a thickness of 5mm, and apply it evenly and compact it to ensure that the repaired surface is on the same plane as the top and bottom surfaces of the steel plate , After curing at 40°C for 20 hours, use a press to test the compressive and tensile strength of the cu...

Embodiment 3

[0028] A new casing repair reinforcing agent formula is composed of the following components by mass percentage: E44: 80%, diethylenetriamine: 7.2%, iron-nickel alloy powder: 6%, length 2mm modified chopped carbon fiber: 2%, Z6011: 1.6%, D310: 0.4%, absolute ethanol: 2.8%. Preparation method: According to the above ratio, in a container with a stirring paddle, under stirring at a speed of 6000r / min, add anhydrous ethanol, E44, iron-nickel alloy powder, D310, 2mm modified chopped carbon fiber, Z6011, and Add while stirring, and then stir for 5 minutes after adding. Then first soak the perforated steel plate with a pore diameter of 4mm and a thickness of 5mm in water for 24 hours. According to the above ratio, add diethylenetriamine to the prepared product, mix it evenly and apply it to the hole of the steel plate, apply it evenly and compact it to ensure The repaired surface and the top and bottom surfaces of the steel plate are on the same plane. After curing at 60°C for 18 h...

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Abstract

The invention discloses a novel casing pipe restoration reinforcing agent, a preparation method and a construction method thereof. A formula comprises epoxy resin, curing agents, alloy powder, modified carbon fiber, coupling agents, dispersing agents and organic solvents. The formula provided by the invention can be used for oil gas field casing damage well casing pipe restoration and reinforcement; a grading hoop is used in the well cementation process; the casing pipe pressure-resistant grade cannot meet the oil gas well casing pipe restoration and reinforcement with high high-construction-pressure fracturing construction pressure resistant requirements. The casing pipe restoration reinforcing agent prepared by using the formula and the preparation method can realize the curing at the normal temperature and stratum temperature in a certain time; before curing, the viscosity is low; the flowability is high; the pumping injection is easy; after curing, the intensity and the material are similar to those of the casing pipe; the materials can be well fused with the metal casing pipe; after curing, the sealing effect is good after restoration on the sleeve damage position; the effective period is long; the anti-tension and pressure-resistant intensity is high; the bonding intensity with the metal sleeve is high; the acid and alkali resistance and anti-corrosion performance are realized; the damaged part of the restored casing pipe can be enabled to have the identical inner diameter with the original casing pipe; the diameter shrinkage and the diameter change cannot occur; thelater stage taking out tools and pipe columns are not influenced.

Description

technical field [0001] The invention relates to the field of oil and gas development, in particular to a novel casing repair reinforcing agent, a preparation method and a construction method. Background technique [0002] During the long-term development of oil and gas wells, due to factors such as plastic deformation of the formation, poor cementing and completion quality, screw thread leakage, perforation misshot, corrosion, casing wear and other factors, the casing is damaged and fails, and the production of oil and gas wells is greatly reduced. reduction, and will lead to formation pollution, and even make oil and gas wells scrapped. These problems will seriously affect the normal production of the oil field. In order to maintain the normal production of the oil and gas field and tap the potential to increase production, the casing must be repaired. Deeply buried wells generally use graded hoops during the cementing process. Due to the low pressure resistance level of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/44E21B29/10C08L63/00C08K13/06C08K9/06C08K7/06C08K3/08
CPCC08L63/00C08L2203/18C09K8/44E21B29/10C08K13/06C08K9/06C08K7/06C08K3/08
Inventor 谢翠娥曲璐璐
Owner 谢翠娥
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