Continuous mixing supply method for acid fracturing fluid

A technology of acid fracturing and acid fluid, which is applied in the direction of earthwork drilling, mining fluid, wellbore/well parts, etc. It can solve the problems of waste of remaining liquid, large investment in equipment, and high labor intensity, so as to save construction fluid and save The effect of controllable equipment cost and dosing accuracy

Active Publication Date: 2014-05-28
李磊
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many problems in this method, the main ones are: (1) Due to the large demand for acidified fracturing fluid, intermittent fluid dosing requires a large number of acid storage tanks, and the cost of fracturing equipment is high; (2) The fluid dosing process requires more Manual operation, the labor intensity of the on-site staff is high; (3) The concentrated hydrochloric acid and hydrofluoric acid used in the acid preparation are highly volatile and corrosive, and there are many safety hazards on the site; (4) Due to many Uncertain factors, first dosing and then construction often lead to waste of remaining liquid; (5) The viscosity of the acidified fracturing fluid is high, and it is difficult to transport the acidized fracturing fluid. During the mixing process of the acidified fracturing fluid, the materials are mixed by centrifugal pumps connected through pipelines When circulating in the acidified fracturing fluid tank to achieve uniform mixing

Method used

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  • Continuous mixing supply method for acid fracturing fluid
  • Continuous mixing supply method for acid fracturing fluid
  • Continuous mixing supply method for acid fracturing fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The method of continuous mixing and supply of acidified fracturing fluid is as follows:

[0047] Step 1, polyacrylamide dry powder is input into the first mixing system through the screw feeding metering device of the thickener feeding metering system, wherein the screw feeding metering device is controlled by the PLC control system, and can be input into the system according to the set water-powder ratio and clean water The input water volume automatically adjusts the dry powder delivery volume; the clean water input system also delivers clean water to the first mixing system, where the flow sensor of the clean water input system feeds back the signal to the PLC control system, and the PLC control system adjusts the proportional control valve to make the clean water The conveying speed and conveying volume meet the specified requirements, so that water can be added while adding thickener dry powder, and the mass ratio of thickener dry powder to water per second is contr...

Embodiment 2

[0052] The method of continuous mixing and supply of acidified fracturing fluid is as follows:

[0053] Step one and step three are the same as embodiment 1,

[0054] Step 2 is: the polyacrylamide premix solution obtained in step 1 is directly pumped into the fourth mixing system through a metering pump, and the metering pump is controlled by a PLC control system, so as to adjust the pumping volume and pump volume of the polyacrylamide premix solution at any time. At the same time, the corresponding acid liquid is sucked from the outside through the two acid-resistant pumps of the acid liquid feeding metering system, and the acid liquid is pumped into the fourth mixing system after passing through the acid-resistant flow sensor and the acid-resistant flow regulating valve on the respective pipelines, controlled by PLC According to the set ratio of the two acid liquids and the signals fed back by the two acid-resistant flow sensors, the system adjusts the input volume and input...

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Abstract

The invention discloses a continuous mixing supply method for acid fracturing fluid. The method includes the following steps of mixing: feeding a thickener premixed solution, acid fluid and various fluid additives into an integral mixing system for solution mixing so as to obtain the uniformly-mixed acid fracturing fluid, and solution distribution: supplying and discharging the acid fracturing fluid obtained in the mixing step. By the mixing method, continuous mixing supply of water, the acid fluid, dry powder or pasty fluid and the various fluid additives can be realized, mixing effect is good, mixing is uniform, and quality of the fracturing fluid is high; in addition, by realization of a continuous automatic acid preparing process, a large amount of labor cost is reduced, the requirement on a fluid storage tank is lowered, construction fluid is saved, and equipment cost is saved.

Description

technical field [0001] The invention relates to the technical field of fluid preparation technology for acidizing fracturing construction in oil and gas fields, in particular to a method for continuously mixing and supplying acidizing fracturing fluid. Background technique [0002] Acid fracturing is the most effective stimulation measure for carbonatite and complex lithology fractured reservoirs. The quality of acidizing fracturing fluid directly determines the quality of improving formation permeability. The main components of acidizing fracturing fluid include hydrochloric acid, hydrofluoric acid, thickener (polyacrylamide), corrosion inhibitor, drainage aid, surfactant, etc. , in the acidizing operation, it is necessary to mix all the materials evenly in advance, and the key technology restricting the acidizing operation is the continuous mixing of acid liquid. [0003] At present, the mixing of acidizing fracturing fluids adopts the traditional method, which mainly inv...

Claims

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Application Information

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IPC IPC(8): E21B43/27
Inventor 李磊
Owner 李磊
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