Fracturing preposed authigenic acid system and fracture reduction method thereof

A self-generating acid and system technology, applied in chemical instruments and methods, mining fluids, earth drilling and production, etc., can solve problems such as hydraulic fracturing failure, abnormal reservoir fracture pressure, pipe string corrosion, etc., and achieve uniform reduction of fracture pressure, Easy transportation, little corrosion effect

Pending Publication Date: 2021-08-06
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Hydraulic fracturing or acid fracturing is an important means of increasing production of unconventional oil and gas resources such as shale gas, tight sandstone gas, and carbonate rock tight oil. However, due to geological and engineering reasons, the fracture pressure of the reservoir often appears before the stimulation. Abnormal, resulting in the failure of hydraulic fracturing or acid fracturing
[0003] Acid treatment technology is an effective measure to reduce fracture pressure. At present, acid reduction and fracture is mainly carried out for sandstone reservoirs. The acid solution involved includes hydrochloric acid and hydrofluoric acid and other acid systems; The pipe string causes strong corrosion. At the same time, due to the current safety and environmental protection measures that restrict the transportation of acid liquid, the current conventional acid liquid can no longer meet the needs of production increase and transformation.
In addition, if the heterogeneity of the horizontal well section is too strong, the conventional acid solution cannot perform fracture reduction stimulation on the low permeability section.

Method used

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  • Fracturing preposed authigenic acid system and fracture reduction method thereof
  • Fracturing preposed authigenic acid system and fracture reduction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In 70ml of water, add 30g of paraformaldehyde (polymerization degree n is 10 to 100) to form autogenic acid mother liquor A; in 70ml of water, add 30g of ammonium chloride to form authigenic acid mother liquor B. In 70ml of water, add 30g of ammonium fluoride to form autogenic acid mother solution C. After the three are mixed in different volume ratios, they are quickly placed in a water bath at 50°C, and the acid generation data after the three are mixed are measured, as shown in the figure. from figure 1 It can be seen that the acid generation effect is the best when the three are mixed at a volume ratio of 1:1:0.1, and the hydrogen ion concentration reaches 3.70mol / L.

Embodiment 2

[0033] (1) In 70ml of water, add 30g of paraformaldehyde (polymerization degree n is 10 to 100) to form autogenic acid mother solution A; in 70ml of water, add 30g of ammonium chloride to form autogenic acid mother solution B. In 70ml of water, add 30g of ammonium fluoride to form autogenic acid mother solution C. Prepare a mixed solution of autogenous acids A, B, and C at a volume ratio of 1:1:0.1 to form a mixed solution 1 with a volume of 50ml.

[0034] (2) Add 0.6% sodium polyoxyethylene lauryl ether sulfate to the mixed solution in (1) to form a mixed solution 2 with a volume of 50 ml.

[0035] (3) Configure a mixed solution of autogenous acid mother liquor B with a mass concentration of 16% and gas initiator sodium nitrite with a mass concentration of 21% to form a mixed solution 3 with a volume of 50ml.

[0036] (4) Mix the mixed solution 2 and the mixed solution 3 together again to form the mixed solution system 4 with a volume of 100ml, and the container used is a 2L...

Embodiment 3

[0039] (1) In 70ml of water, add 30g of paraformaldehyde (polymerization degree n is 10 to 100) to form autogenous acid mother liquor A; in 70ml of water, add 30g of ammonium chloride to form autogenous acid mother liquor B. In 70ml of water, add 30g of ammonium fluoride to form autogenic acid mother solution C. Prepare a mixed solution of autogenous acids A, B, and C at a volume ratio of 1:1:0.1 to form a mixed solution 1 with a volume of 50ml.

[0040] (2) Add 0.6% sodium polyoxyethylene lauryl ether sulfate to the mixed solution in (1) to form a mixed solution 2 with a volume of 50 ml.

[0041] (3) Configure a mixed solution of autogenous acid mother liquor B with a mass concentration of 16% and gas initiator ammonium persulfate with a mass concentration of 21% to form a mixed solution 3 with a volume of 50ml.

[0042] (4) Mix the mixed solution 2 and the mixed solution 3 together again to form the mixed solution system 4 with a volume of 100ml, and the container used is a...

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Abstract

The invention provides a fracturing preposed authigenic acid system and a fracture reduction method thereof. The fracturing preposed authigenic acid system comprises authigenic acid mother liquor A, authigenic acid mother liquor B and authigenic acid mother liquor C, wherein the authigenic acid mother liquor A is a paraformaldehyde aqueous solution, and the polymerization degree n is 10-100; the authigenic acid mother liquor B is an ammonium chloride aqueous solution; and the authigenic acid mother liquor C is an ammonium fluoride aqueous solution. According to the fracturing preposed authigenic acid system, the authigenic acid mother liquor A, the authigenic acid mother liquor B and the authigenic acid mother liquor C can be mixed at the bottom of a well on the basis of efficient transportation and no corrosion of a tubular column, and acid liquor is spontaneously and continuously generated, so that the purpose of no corrosion of the tubular column is achieved. Meanwhile, the generated acid liquor reacts with rock minerals, so that drilling and completion fluid pollution in a near shaft zone can be efficiently relieved, the porosity and permeability of a reservoir stratum are increased, the fluid absorption capacity of the reservoir stratum is improved, the fracture pressure of the reservoir stratum is reduced, the displacement of construction can be increased, and the effect of large-scale yield increase and transformation is achieved.

Description

technical field [0001] The invention belongs to the technical field of hydraulic fracturing stimulation, and in particular relates to an authigenic acid system before fracturing and a method for reducing fracture. Background technique [0002] Hydraulic fracturing or acid fracturing is an important means of increasing production of unconventional oil and gas resources such as shale gas, tight sandstone gas, and carbonate rock tight oil. However, due to geological and engineering reasons, the fracture pressure of the reservoir often appears before the stimulation. Abnormal, resulting in the failure of hydraulic fracturing or acid fracturing construction. [0003] Acid treatment technology is an effective measure to reduce fracture pressure. At present, acid reduction and fracture is mainly carried out for sandstone reservoirs. The acid solution involved includes hydrochloric acid and hydrofluoric acid and other acid systems; The pipe string caused strong corrosion. At the sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/72C09K8/74E21B43/27
CPCC09K8/72C09K8/725C09K8/74E21B43/26
Inventor 李小刚朱静怡杨兆中秦杨彭擎东贾敏
Owner SOUTHWEST PETROLEUM UNIV
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