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Low-friction recyclable slickwater fracturing fluid suitable for compact oil and gas reservoirs and preparation method thereof

A technology for oil and gas reservoirs and low friction, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as increasing construction costs, and achieve the effects of low reservoir damage, easy flowback and low viscosity

Active Publication Date: 2014-02-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

But at present, there are not many drag reducers with independent intellectual property rights in China, and the major oil fields mainly use linear rubber and foreign drag reducers, which invisibly increases the construction cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Pre-preparation mode: under the circulation conditions of large-displacement cement trucks, 0.25% water-soluble drag reducer, 0.5% demulsification aid and drainage agent and 0.5% clay stabilizer are inhaled sequentially through the negative pressure of the vacuum jet funnel, and a certain Viscosity milky white homogeneous solution, during fracturing construction, sucked by sand mixing truck, mixed evenly with proppant and degradation agent, then pumped into the formation by pump truck, used as slick water fracturing. This process is suitable for the working conditions where the volumetric fracturing process of large displacement vertical wells or horizontal wells is suitable for pre-configured fracturing fluid.

Embodiment 2

[0025] Continuous mixing mode: Store the drag reducer, drainage aid, and clay stabilizer in iron or plastic storage tanks, and use the proportional pump of the continuous mixing vehicle and the sand mixing vehicle to reduce the water solubility by 0.06% according to the construction displacement. Resistor, 0.2% demulsification aid and drainage agent and 0.5% clay stabilizer are pumped into the mixing tank of the sand mixer to form a uniform solution, and at the same time mixed with proppant and degradation agent. This process is suitable for fracturing field preparation with continuous mixing operations.

Embodiment 3

[0027] Preparation of fracturing fluid flowback fluid: After simple sand removal or water quality treatment, the fracturing fluid flowback fluid can be reconstituted into slippery water fracturing fluid through the method of Example 1 or Example 2 to realize fracturing Water reuse.

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Abstract

The invention relates to a low-friction recyclable slickwater fracturing fluid system suitable for compact oil and gas reservoirs and a preparation method thereof. Every tonnage of water is added with 0.06-0.25% of a water soluble drag reducer by mass, 0.2-0.5% of a demulsification cleanup additive by mass and 0.5% of a clay stabilizer by mass for evenly mixing to obtain a slickwater fracturing fluid; the prepared slickwater fracturing fluid is a reverse phase micro-emulsion system, and has the characteristics such as low viscosity, thorough gum breaking, easy flowing back, good expansion prevention performance and low friction; the resistance reducing effect is obvious; compared with clear water, the resistance reducing effect can achieve 50-70%; in the scene hydraulic fracturing operation, the resistance reducing rate of the water soluble drag reducer is 42.5% higher than that of the traditional guanidine gum slickwater in the case that the construction displacement is 3.5 m<3> / min.

Description

technical field [0001] The invention belongs to the field of oil field stimulation, in particular to a low-friction recyclable slick water fracturing fluid system suitable for tight oil and gas reservoirs and a preparation method thereof. Background technique [0002] Tight unconventional reservoirs are characterized by low porosity and low permeability, making exploration and development difficult. Most tight oil and gas wells require reservoir reconstruction to obtain ideal production. At present, the most important production stimulation measure for tight unconventional reservoirs at home and abroad is friction reduction fracturing, that is, using low-friction slick water fracturing fluid for volume stimulation. The slick water fracturing fluid system is a new fracturing fluid system developed for the stimulation of tight unconventional reservoirs. In the United States, Canada and other countries, the use of slickwater fracturing fluid has achieved significant economic b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/68C09K8/882C09K2208/28
Inventor 郭钢慕立俊赵振峰李宪文张矿生薛小佳吴江马兵周晓群吕海燕刘锦曹宗熊郭小勇范华波
Owner PETROCHINA CO LTD
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