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Foam-like fracturing system, preparation method and filling method thereof

A foam and system technology, applied in the field of fracturing fluid, can solve the problems of reducing formation porosity and permeability, stopping pumps, and low flowback rate, and achieves the effects of enhancing sand-carrying capacity, reducing preparation difficulty, and increasing flowback pressure

Inactive Publication Date: 2015-07-22
四川省博仁达石油科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the fracturing process of low-pressure and low-permeability formations, the flowback energy of the fracturing fluid is insufficient. In the process of hydraulic sand fracturing, a large amount of fracturing fluid is injected into the formation. (Pressure coefficient 0.93~0.97), insufficient flowback energy of the fracturing fluid causes a large amount of liquid to remain in the formation after construction, thus causing a certain degree of damage to the formation and affecting the effect of fracturing stimulation
Studies have shown that even if the fracturing fluid itself is less harmful, if the fracturing fluid has a slow flowback rate and a low flowback rate, it will increase the water saturation of the reservoir, increase the two-phase seepage resistance, produce water sensitivity, Damage such as water lock will greatly reduce the porosity and permeability of the formation, and even seal the gas layer, which will seriously affect the effect of fracturing and increase production, and even have no production capacity after fracturing
In order to solve the problem of flowback, the whole process of liquid nitrogen injection is adopted, and the average amount of liquid nitrogen per well is 5-10m 3 However, the accompanying injection of liquid nitrogen brings a lot of trouble to the site construction, and there are also big problems in the storage of liquid nitrogen, which also increases the cost of using liquid nitrogen trucks and liquid nitrogen pump trucks. There have also been problems caused by liquid nitrogen pump trucks and liquid nitrogen pump trucks The liquid nitrogen manifold leaks and the pump is stopped midway during sand injection, which seriously affects the fracturing effect
In particular, liquid nitrogen mixed injection cannot solve the problem of flowback of filtrate that invades the formation matrix, and the flowback effect of many low-pressure oil and gas wells after liquid nitrogen mixed injection and sand fracturing is relatively poor

Method used

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  • Foam-like fracturing system, preparation method and filling method thereof
  • Foam-like fracturing system, preparation method and filling method thereof
  • Foam-like fracturing system, preparation method and filling method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Foam-like fracturing fluid, which includes base fluid, acidic fluid and gel breaker, and the weight ratio of base fluid:acidic fluid:gel breaker is 10:0.8:0.006, and the base fluid includes water and the following components, And each component accounts for the weight percentage of water is:

[0047] Sodium Nitrite 2.0%,

[0048] Ammonium chloride 3%,

[0049] Hydroxypropyl guar gum 0.5%,

[0050] Cross-linking agent 0.1%,

[0051] Sodium carbonate 0.06%;

[0052] Clay stabilizer 0.5%;

[0053] Drainage aid 0.5%;

[0054] Fungicide 0.2.

[0055] Described acidic liquid comprises water and following component, and component accounts for the weight percent of water is:

[0056] Foam stabilizer 0.05%,

[0057] Acid catalyst 4%,

[0058] Corrosion inhibitor 0.2%.

[0059] The breaker is one or more mixtures of iodate and bromate.

[0060] Described cross-linking agent, it is made of the raw material of following weight ratio: glycerol 12.5, borax 12, sodium glucona...

Embodiment 2

[0079] Foam-like fracturing fluid, which includes base fluid, acidic fluid and gel breaker, and the weight ratio of base fluid:acidic fluid:gel breaker is 10:1:0.004, and the base fluid includes water and the following components, And each component accounts for the weight percentage of water is:

[0080] Sodium Nitrite 3%,

[0081] Ammonium chloride 2.5%,

[0082] Hydroxypropyl guar gum 0.4%,

[0083] Cross-linking agent 0.04%,

[0084] Sodium carbonate 0.1%;

[0085] Clay stabilizer 0.3%;

[0086] Drainage aid 0.5%;

[0087] Fungicide 0.1%.

[0088] Described acidic liquid comprises water and following component, and component accounts for the weight percent of water is:

[0089] Foam stabilizer 0.1%,

[0090] Acid catalyst 2%,

[0091] Corrosion inhibitor 0.3%.

[0092] The breaker is one or more mixtures of iodate and bromate.

[0093] Described cross-linking agent, it is made of the raw material of following weight ratio: glycerol 15, borax 10, sodium gluconate...

Embodiment 3

[0112] Foam-like fracturing fluid, which includes base fluid, acidic fluid and gel breaker, and the weight ratio of base fluid:acidic fluid:gel breaker is 10:1.5:0.002, and the base fluid includes water and the following components, And each component accounts for the weight percentage of water is:

[0113] Sodium Nitrite 4.9%,

[0114] Ammonium chloride 6.3%,

[0115] Hydroxypropyl guar gum 0.25%,

[0116] Cross-linking agent 0.2%,

[0117] Sodium carbonate 0.12%;

[0118] Clay stabilizer 0.2%;

[0119] Drainage aid 0.5%;

[0120] Fungicide 0.3%.

[0121] Described acidic liquid comprises water and following component, and component accounts for the weight percent of water is:

[0122] Foam stabilizer 0.15%,

[0123] Acid catalyst 6%,

[0124] Corrosion inhibitor 0.4%.

[0125] The breaker is one or more mixtures of iodate and bromate.

[0126]Described cross-linking agent, it is made of the raw material of following weight ratio: glycerol 20, borax 15, sodium gluc...

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Abstract

The invention discloses a foam-like fracturing system, which comprises a base liquid, an acid liquid and a gel breaker, wherein a weight ratio of the base liquid to the acid liquid to the gel breaker is 10:0.8-1.5:0.002-0.006. The invention further discloses a foam-like fracturing liquid preparation method, which comprises the following steps: S1, preparing a cross-linking agent, S2, preparing a base liquid, and S3, preparing an acid liquid. The invention further discloses a foam-like fracturing liquid filling method. According to the present invention, functions similar to the conventional foam fracturing liquid are provided, heat and gas can be automatically generated under a stratum condition, integration of automatic gas generation, acid cross-linking and the foam-like structure is achieved, the structure viscosity is stable, sand carrying capacity of the fracturing liquid can further be enhanced, filtration loss resistance is strong, intrusion damage on the stratum can be effectively reduced, a water lock effect can be effectively reduced, the guar gum use amount and the fracturing liquid base liquid preparation difficulty are effectively reduced, and effects of excellent sand carrying, gel breaking, low damage and cleanup are provided.

Description

technical field [0001] The invention relates to the technical field of fracturing fluid, in particular to a foam-like fracturing system and its preparation method and filling method. Background technique [0002] Fracturing fluid provides the means of hydraulic fracturing operation, but among the factors that affect the success or failure of fracturing, fracturing fluid and its performance are extremely important. For large fracturing, this factor is even more prominent. The purpose of using fracturing fluid is twofold: one is to provide sufficient viscosity, use hydraulic wedge action to form fractures to extend, and transport and lay fracturing proppant along the fracture; The fluid is quickly chemically decomposed and broken to low viscosity, ensuring that most of the fracturing fluid is flowed back to the ground to clean the fractures. [0003] At present, there are many kinds of fracturing fluids used at home and abroad, mainly oil-based fracturing fluids, water-based...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68C09K8/70C09K8/74E21B43/26
Inventor 张绍斌康毅唐朝均杨延波
Owner 四川省博仁达石油科技有限公司
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