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A kind of artificial mudstone and its method for plugging the flow outside casing of oil and gas well

A technology for oil and gas wells and mudstones, which is applied to the field of plugging the outer casing of oil and gas wells. The effect of blocking work efficiency

Active Publication Date: 2016-03-16
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

[0005] The main problems of the mechanical isolation method represented by the above-mentioned patent documents are: 1. The casing is easily deformed after hydraulic jet multi-stage fracturing, and the mechanical packer is prone to pipe sticking; When there is flow outside the casing behind the well, the mechanical isolation method will fail; 3. The casing completion method does not cement the wellbore annulus and the mechanical isolation method is not applicable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides an artificial mudstone, the precondition of which is a coating resin. Under the conditions of temperature 45~150℃, pressure 2~5MPa, and action time not less than 1h, the film-coated resin forms high-strength artificial mudstone for plugging the flow outside the horizontal well casing.

[0030] Preferably, the coating resin includes the following components, and the composition of each component in weight percentage is: polyvinyl alcohol (PVA) water-absorbing swelling resin 40%, rosin resin 10%, phenolic resin 15%, urea-formaldehyde resin 10% , urotropine 5% and nano calcium carbonate 20%. After measurement, the density of the coating resin described in this embodiment is 1.08g / cm 3 , particle size 70 mesh ~ 200 mesh.

[0031] Before the construction operation of plugging the cascading flow outside the casing of the horizontal well, the prepared composition also needs to include carrier fluid and active water.

[0032] Preferably, the carrier ...

Embodiment 2

[0040] This embodiment provides an artificial mudstone, the precondition of which is a coating resin. Under the conditions of temperature 45~150℃, pressure 2~5MPa, and action time not less than 1h, the film-coated resin forms high-strength artificial mudstone for plugging the flow outside the horizontal well casing.

[0041] Preferably, the coating resin includes the following components, and the composition of each component in weight percentage is: polyvinyl alcohol (PVA) water-absorbing swelling resin 47%, rosin resin 15%, phenolic resin 15%, urea-formaldehyde resin 8% , urotropine 3% and nano calcium carbonate 12%. After measurement, the density of the coating resin described in this embodiment is 1.10g / cm 3 , particle size 70 mesh ~ 200 mesh.

[0042] Before the construction operation of plugging the cascading flow outside the casing of the horizontal well, the prepared composition also needs to include carrier fluid and active water.

[0043] Preferably, the carrier f...

Embodiment 3

[0051] This embodiment provides an artificial mudstone, the precondition of which is a coating resin. Under the conditions of temperature 45~150℃, pressure 2~5MPa, and action time not less than 1h, the film-coated resin forms high-strength artificial mudstone for plugging the flow outside the horizontal well casing.

[0052] Preferably, the coating resin includes the following components, and the composition of each component in weight percentage is: polyvinyl alcohol (PVA) water-absorbing swelling resin 30%, rosin resin 20%, phenolic resin 20%, urea-formaldehyde resin 10% , urotropine 2% and nano calcium carbonate 18%. After measurement, the density of the coating resin described in this embodiment is 1.15g / cm 3 , particle size 70 mesh ~ 200 mesh.

[0053] Before the construction operation of plugging the cascading flow outside the casing of the horizontal well, the prepared composition also needs to include carrier fluid and active water.

[0054] Preferably, the carrier ...

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Abstract

The invention discloses artificial mudstone and a method for sealing and blocking oil-gas well casing tube outer cross-flow by using the artificial mudstone. The artificial mudstone is formed by film coated resin under the conditions that the temperature is 45 to 150 DEG C, the pressure is 2 to 5 MPa, and the acting time is not shorter than 1 hour; the film coated resin comprises the following ingredients in percentage by weight: 30 to 50 percent of polyvinyl alcohol water-absorbent expanding resin, 10 to 20 percent of rosin resin, 10 to 20 percent of phenolic resin, 5 to 10 percent of urea resin, 2 to 5 percent of methenamine and 10 to 30 percent of nanometer calcium carbonate. The method for sealing and blocking the oil-gas well casing tube outer cross-flow by using the artificial mudstone comprises the following steps that: (1) the nanometer calcium carbonate and carrying fluid are injected, and non-permeability sealing and blocking is formed; (2) activated water is injected; and (3) the film coated resin and the carrying fluid are injected, and the artificial mudstone is formed. The artificial mudstone and the method provided by the invention have the advantages that the effect of fast sealing and blocking well shaft annuluses of the oil-gas well casing tube outer cross-flow at the horizontal sections of a horizontal well in one step is achieved; the artificial mudstone has a long sealing and plugging lasting period, and is applicable to the well repair operation after the hydrajet fracturing modification of the horizontal well in petroleum extraction; and the construction success ratio of the later-stage horizontal well water blocking process can be favorably improved.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and relates to an artificial mudstone and a construction method for plugging the flow outside casing pipes of oil and gas wells by using the artificial mudstone. The invention is applicable to the workover operation of the horizontal well after hydraulic jet fracturing transformation in oil exploitation, and is beneficial to improving the success rate of the horizontal well water shutoff process in the later stage. Background technique [0002] The number of horizontal wells in the development of low-permeability oil and gas fields is increasing, and the completion methods of horizontal wells mainly fall into three categories: open hole completion, screen completion and casing completion. The reservoir stimulation process of horizontal wells completed with casing is mainly hydraulic jet fracturing, and the annulus between casing and reservoir rock wall in the horizontal section of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/13
Inventor 蒋文学任雁鹏李勇郑维师周然马托金娜汪小宇陈迎花柴巧玲王所良
Owner BC P INC CHINA NAT PETROLEUM CORP
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