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Method for nondegradable gel breaking of vegetable gelatin fracturing fluid

A fracturing fluid, non-degradable technology, used in chemical instruments and methods, earthwork drilling, drilling composition, etc. It can reduce the construction process and quality control points, achieve good economic benefits and environmental protection effects, and shorten the construction period.

Inactive Publication Date: 2014-03-26
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) Destroy the molecular structure of vegetable gum fracturing fluid: Currently, the commonly used gel breakers are mostly oxidative gel breakers (ammonium persulfate, hydrogen peroxide, sodium hypochlorite, potassium permanganate, etc.) or biological enzyme gel breakers. Both of these agents destroy the molecular chains of vegetable gum fracturing fluid, and degrade long-chain macromolecules into small molecules, so that the cross-linkable groups of plant collagen are greatly reduced or completely lost, so that the flowback fluid cannot be reused. Dosing or secondary crosslinking
[0007] (2) Serious environmental pollution: After the fracturing fluid is oxidized and broken and discharged into the sewage tank, it not only causes a waste of thickener and water resources, but also adds a certain amount of work to the construction site (water preparation, digging the sewage tank, Transportation of sewage, etc.), on the other hand, more importantly, it has seriously affected the local water source, atmosphere, soil, crop growth, etc.
[0008] (3) There are many safety and environmental risks: the currently commonly used gel breaker is ammonium persulfate, which is white particles and packed in fiber tapes. It is easy to cause corrosion to people during preparation, and it is difficult to mix quickly and evenly at low temperature

Method used

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  • Method for nondegradable gel breaking of vegetable gelatin fracturing fluid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Such as figure 1 As shown, a method for non-degradable gel breaking of vegetable gum fracturing fluid is characterized in that: the method comprises the steps:

[0032] 1) Preparation of fracturing fluid: Weigh 0.28g of vegetable gum thickener, stir at 2000rad / min, slowly and evenly add it to 100mL of tap water, stir for 3-5mim and stop, let stand for 1-2h, Make it fully swell; add 0.3mL clay stabilizer NTWDJ-1, 0.1mL fungicide SSJ-1, stir for 30-90s; add 0.4mL drainage aid CF-5D, stir for 30-90s; add 0.015mL compound Gel breaker FPJJ-1, stir for 60-90s, add 0.25mL of cross-linking agent JLJ-1, stir for 60-90s, and that’s it.

[0033] 2) Non-degradable gel breaking: refers to the reaction of the composite gel breaker FPJJ-1 in the fracturing fluid in step 1 with other additives in the formulation during the well shut-in process after fracturing; At a temperature of 80°C, the composite gel breaker FPJJ-1 continuously releases hydrogen ions, which reduces the borate dis...

Embodiment 2

[0038] It is basically the same as Example 1, the difference is: the step 1) preparation of fracturing fluid: 0.25g of vegetable gum thickener, 0.30mL of drainage aid CF-5D, and 0.30mL of composite breaker FPJJ-1 0.01mL; the step 2) formation temperature is 50°C, the reaction temperature is 50°C, and the reaction time is 0.5 hours; the step 4) vegetable gum thickener is 0.05g, and the crosslinking agent JLJ-1 is 0.40 mL; the vegetable gum thickener is hydroxypropyl guar gum.

Embodiment 3

[0040] It is basically the same as Example 1, the difference is: the step 1) preparation of fracturing fluid: 0.3g of vegetable gum thickener, 0.50mL of drainage aid CF-5D, and 0.50mL of composite breaker FPJJ-1 0.02mL; the step 2) formation temperature is 100°C, the reaction temperature is 100°C, and the reaction time is 2 hours; the step 4) vegetable gum thickener is 0.15g, and the crosslinking agent JLJ-1 is 0.60 mL; the vegetable gum thickener is a mixture of guar gum and hydroxypropyl guar gum in a mass ratio of 1:1.

[0041]The vegetable gum thickener in the foregoing embodiments can also be one or more of guar gum, hydroxypropyl guar gum, and super guar gum.

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Abstract

The invention relates to a method for nondegradable gel breaking of vegetable gelatin fracturing fluid. The method for the nondegradable gel breaking of the vegetable gelatin fracturing fluid is characterized by comprising the following steps of 1) fracturing fluid preparation, 2) nondegradable gel breaking, 3) gel breaking and flowback, and 4) secondary utilization. The nondegradable gel breaking is that when fracturing is finished, a composite gel breaker FPJJ-1 in the fracturing fluid releases hydrogen ions continuously, reaction equilibrium is made to be changed according to the distribution of formation liquid temperatures, a considerable quantity of thickener exists in flowback fluid, and the nondegradable gel breaking of the vegetable gelatin fracturing fluid is achieved. The method can reduce the discharge of operation sewage and the waste of a fracturing fluid additive, and has good economic benefit and environment-friendly effect.

Description

technical field [0001] The invention relates to a method for non-degradable gel breaking of plant gum fracturing fluid, which belongs to the field of oil and gas field development and production increase measures. Background technique [0002] The widely used HPGF water-based gel fracturing fluid has many advantages such as good shear resistance, good thermal stability, low water insoluble matter and gel-breaking residue, and strong fluid loss control ability. Since the end of 2011, the price of guar gum powder has risen rapidly, which has greatly increased the cost of guar gum fracturing fluid. Therefore, the non-degradable gel breaking technology of vegetable gum fracturing fluid has good significance for the recovery and utilization of fracturing fluid. Can greatly reduce costs. [0003] During the fracturing construction process, the fracturing fluid must have good viscosity and elasticity, and the friction along the pipeline should be as small as possible, so that the ...

Claims

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Application Information

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IPC IPC(8): E21B43/26C09K8/68
Inventor 孙虎王祖文张冕廖乐军陈亚联高红平郭伟林高燕李楠李婧赵文钢陈飞陶长州白锋军樊启国刘小会彭树禹
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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