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A liquid injection pipe sealing method suitable for hydraulic fracturing simulation tests of low-permeability reservoirs

A hydraulic fracturing and simulation test technology, applied in sealing/isolation, earthwork drilling, wellbore/well components, etc., can solve the problem of failure to consider the effect and strength of sealing, poor protection of the open hole section, and crack initiation Problems such as leakage of the pressure sealing section, to achieve the effect of improving the effect, strong operability, and improving the bonding strength

Active Publication Date: 2020-11-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The liquid injection pipe and the rock sample are simply connected, without considering the effect and strength of the seal, so that the leakage of the sealing section occurs before the cracking pressure of the rock sample is reached;
[0004] (2) There is no good protection for the open hole section, and the colloid may seep into the open hole section to block the injection hole;
[0005] (3) Disturbing factors such as air bubbles will be generated in the conventional one-time glue injection process

Method used

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  • A liquid injection pipe sealing method suitable for hydraulic fracturing simulation tests of low-permeability reservoirs
  • A liquid injection pipe sealing method suitable for hydraulic fracturing simulation tests of low-permeability reservoirs
  • A liquid injection pipe sealing method suitable for hydraulic fracturing simulation tests of low-permeability reservoirs

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The liquid injection pipe sealing method of the present invention is illustrated with the liquid injection pipe sealing of cylindrical rock sample, as figure 1 shown.

[0049] Step S1, Drilling: At the center of the upper surface of the cylindrical remodeling sample 7 with a diameter of 100mm and a height of 200mm, use a zs-100 drilling machine to drill a 130mm injection hole along the injection direction, and drill hole 1 with a diameter of 8mm and remove it. cuttings;

[0050] Step S2, prepare colloids: put glues A and B in the front of the electric fan, adjust the temperature of the fan to 80 degrees, measure 1.1ml of A glue and 1.1ml of B glue with a measuring cylinder, according to A glue: B glue is mixed at a ratio of 1:1 while heating, and finally measure 0.4ml of lauryl to tetradecyl glycidyl ether and 0.04ml of ethanol, add it to the mixed AB glue, and slow down the initial setting of the colloid. Time, increase the pouring time, strengthen the sealing effect...

Embodiment 2

[0056] The liquid injection pipe sealing of the cylindrical rock sample is used to illustrate step S1 of the liquid injection pipe sealing method of the present invention. Drilling: at the center of the upper surface of the cylindrical remodeling sample with a diameter of 100 mm and a height of 200 mm, use a zs-100 type drill along the Drill into the 130mm liquid injection hole in the direction of liquid injection, the diameter of the drill hole is 11mm and remove the cuttings; Step S2, prepare the colloid: put the adhesive A and B glue on the front end of the electric fan, adjust the temperature of the electric fan to 80 degrees, and use Measure 2ml of glue A and 2ml of glue B in the measuring cylinder, heat and mix according to the ratio of glue A: glue B of 1:1, and finally measure 0.55ml of dodecyl to myristyl glycidyl ether and 0.05ml of Mix with ethanol, add it to the mixed AB glue, slow down the initial sticking time of the colloid, make the pouring time longer, and stre...

Embodiment 3

[0061] The liquid injection pipe sealing method of the present invention is illustrated with the liquid injection pipe sealing of the cube shale sample

[0062] Step S1. Drilling: At the center of the upper surface of the 300×300×300mm cube shale sample, use a zs-100 drilling rig to drill a 200mm injection hole along the injection direction with a diameter of 20mm and remove cuttings;

[0063] Step S2, prepare the colloid: put the adhesives A and B in the front of the electric fan, adjust the temperature of the fan to 80 degrees, measure 12ml of A glue and 12ml of B glue with a measuring cylinder, according to the formula of A glue: B glue Mix while heating at a ratio of 1:1, and finally measure 2.5ml of dodecyl to myristyl glycidyl ether and 0.6ml of ethanol and mix them, and add them to the mixed AB glue to slow down the initial sticking time of the colloid. It increases the pouring time and strengthens the sealing effect.

[0064] Step S3, treatment of the injection tube: ...

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Abstract

The invention provides a liquid injection pipe sealing method suitable for a hydraulic fracturing simulation test in a low-permeability reservoir. Prepared adhesive liquid A and prepared adhesive liquid B are adopted to be matched with C12-14-alkyl glycidyl ether and ethyl alcohol to serve as a sealing material; during injection of adhesive liquid, sealing is conducted in a multiple adhesive injection mode, the adhesive liquid is slowly injected in eight to ten layers, the injection interval for each layer is 9-10 s, during injection, the top end of a pinhead is always in an adhesive body, itis ensured that rock and adhesive are closely combined, and liquid injection in an open well section is not affected. According to the liquid injection pipe sealing method, the loss problem of a sealing pipe segment in the hydraulic fracturing process is eliminated, thus hydraulic liquid smoothly arrives in a target area through a liquid injection pipe, operability is high, the sealing problem ofleakage of the rock and adhesive interface can be effectively solved, and it is of great significance to further develop the hydraulic fracturing test.

Description

technical field [0001] The invention belongs to the field of laboratory testing and unconventional energy development, and in particular relates to a sealing method suitable for hydraulic fracturing injection pipes of low-permeability rock samples. Background technique [0002] At present, in the field of unconventional energy, the exploitation of tight gas reservoirs has become a hot topic. According to the geological conditions of its occurrence, the reservoirs will be modified when exploiting low-permeability gas. Hydraulic fracturing is the main method. Influenced by various reasons on site, it is impossible to conduct an ideal analysis of the transformation effect. At present, researchers mainly rely on indoor experimental instruments to physically simulate the field fracturing transformation process. Production provides strong theoretical support. In addition, when performing hydraulic fracturing tests, whether it is the remolded sample or the original sample, the sea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B33/13G06F30/20
Inventor 曹函高强孙平贺叶功勤张政王天一
Owner CENT SOUTH UNIV