Novel environment-friendly biological knot and use method thereof

A bio-fouling, environmentally friendly technology, applied in earth-moving drilling, production fluids, wellbore/well components, etc., to achieve the effect of slow dissolution and maintaining plugging performance

Active Publication Date: 2021-06-25
SICHUAN WELDON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, it solves the defects in the construction of the existing temporary plugging ball and temporary plugging agent

Method used

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  • Novel environment-friendly biological knot and use method thereof
  • Novel environment-friendly biological knot and use method thereof
  • Novel environment-friendly biological knot and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Select a degradable polyglycolic acid material with a tensile strength of 120MPa and a molecular weight of 1-100w, spin the polyglycolic acid material, weave it into a rope, and then use the polyglycolic acid rope to make a knot with a diameter of 17-20mm , The diameter of the knot can be adjusted according to the hole to be blocked, and the two ends of the knot leave a braided wire with a length of 20-25mm, and the novel environmentally friendly biological knot proposed by the present invention can be obtained.

[0063] The dissolution test was carried out on the new environmentally friendly biological knot, the test temperature was 90°C, and the medium was clean water. Place the new environmentally friendly biological knot in the reagent bottle.

[0064] Test results: Under the condition of 90 ℃ and clear water, it began to dissolve on the 4th day, the knot part was completely broken on the 6th day, and completely dissolved on the 11th day. After drying and weighing,...

Embodiment 2

[0066] Select a degradable polyglycolic acid material with a tensile strength of 120MPa and a molecular weight of 1-100w, spin the polyglycolic acid material, weave it into a rope, and then use the polyglycolic acid rope to make a knot with a diameter of 17-20mm The two ends of the knot leave a braided wire with a length of 20-25mm, and the novel environment-friendly biological knot proposed by the present invention can be obtained.

[0067] The new environment-friendly biological knot is mixed with the acrylamide modified copolymer as a strengthening agent, and the dissolution test of the new environment-friendly bio-knot is carried out. The test temperature is 90°C, and the medium is clean water. Place the new environmentally friendly biological knot in the reagent bottle.

[0068] For the results of the dissolution test, see figure 2 , the results show that the new environmentally friendly bio-concrete dissolves slowly in the enhancer, can maintain effective sealing for 2...

Embodiment 3

[0070] Select a degradable polyglycolic acid material with a tensile strength of 120MPa and a molecular weight of 1-100w, spin the polyglycolic acid material, weave it into a rope, and then use the polyglycolic acid rope to make a knot with a diameter of 17-20mm The two ends of the knot leave a braided wire with a length of 20-25mm, and the novel environment-friendly biological knot proposed by the present invention can be obtained.

[0071] Carry out a pressure test to verify the pressure-bearing performance of the new environmentally friendly bio-junction in the strengthening liquid.

[0072] Test overview: The maximum outer diameter of the new environmentally friendly biological knot is 19.42mm, the smallest outer diameter is 15.36mm, and the hole diameter is 9mm.

[0073] Connect the test tooling, add 1 liter of jelly strengthening solution, let stand for 30 minutes, and then add water;

[0074] Heating up to 90°C, constant temperature for 2 hours, pressure at 52.26MPa, p...

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Abstract

The invention discloses an environment-friendly biological knot which adopts a rope knot type design, is used for staged fracturing and can replace a bridge plug and a use method of the environment-friendly biological knot. Degradable fiber materials with the tensile strength greater than 120 MPa are woven into a rope, then, the rope is made into a rope knot, and woven lines with certain lengths are respectively reserved at two ends of the rope knot. The diameter of the environment-friendly biological knot used for staged fracturing and capable of replacing the bridge plug is prepared according to the size of a hole needing to be plugged. The construction risk of the bridge plug is reduced, the reservoir is uniformly fractured, and staged fracturing can be performed on the casing deformation section; section loss of a casing deformation well is avoided; staged fracturing can be performed on the casing deformation section according to design; and the influence of casing deformation on the yield of the well is reduced. Meanwhile, the construction defects of the existing temporary plugging ball and temporary plugging agent are overcome.

Description

technical field [0001] The invention belongs to the field of geological exploration and development, and in particular relates to a device for substituting bridge plugs for staged fracturing, in particular to an environmentally friendly biological knot for substituting bridge plugs for staged fracturing and its application method. Background technique [0002] With the rapid development of society and the continuous consumption of global energy, unconventional oil and gas resources are gradually being developed and utilized. In addition, currently proven unconventional oil and gas resources are very rich, mainly some tight shale gas, shale oil, and coalbed methane. However, unconventional oil and gas resources are facing development problems such as low permeability or even ultra-low permeability. How to improve the recovery factor and reserve production rate of low permeability oil and gas reservoirs has gradually become an urgent problem to be solved in the field of oil and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B43/26E21B43/11
CPCE21B33/13E21B43/261E21B43/11
Inventor 田之江张其平易建国张克成刘严
Owner SICHUAN WELDON CHEM
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