Weighting water-based fracturing drag reducer

A technology for water-based fracturing and base fluid, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of limited weighting ability of sodium and potassium salts and affect liquid properties, etc., and achieves low cost and fast dispersion speed. , reduce the effect of collision

Inactive Publication Date: 2014-05-28
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the process of field use in oil fields, various methods of aggravating fracturing fluids are adopted, generally adding soluble sodium salts and potassium salts. The reason for choosing sodium salts and potassium salts is that the current conventional fracturing fluid system is alkaline, and other Non-sodium and potassium salts will precipitate in the system, which will affect the performance of the liquid, but the ability to add weight to sodium and potassium salts is limited

Method used

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  • Weighting water-based fracturing drag reducer
  • Weighting water-based fracturing drag reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of drag reducer (the following substances are all parts by weight): After dissolving 25 parts of dimethylaminoethyl methacrylate chloroalkyl quaternary ammonium salt and 12 parts of acrylamide monomer in 25 parts of water, slowly add it dropwise to 34.9 parts In a mixed solution of white oil and 3 parts of span80, under the trigger of 0.1 part of azobisisobutyronitrile, stir at 50° C. for 10 h.

[0031] Slowly add 0.02 g of the drag reducer emulsion prepared in the previous step into 99.48 g of water, stir vigorously to completely disperse the emulsion, then add 0.5 g of 3% by weight Intechem-06 methanol solution, and finally add 10 g of CuCl 2 , and vigorously stirred for 30 minutes to obtain the weighted drag reducing fluid of the present invention with a density of 1.12g / cm 3 .

Embodiment 2

[0033] Slowly add 0.05 g of the drag reducer emulsion prepared in Example 1 dropwise to 99.25 g of water, stir vigorously to completely disperse the emulsion, then add 0.7 g of 3% by weight of FS-300 methanol solution, and finally add 50 g of ZnCl 2 , and vigorously stirred for 30 minutes to obtain the weighted drag reducing fluid of the present invention with a density of 1.46g / cm 3 .

Embodiment 3

[0035] Slowly add 0.1 g of the drag reducer emulsion prepared in Example 1 dropwise to 98.9 g of water, stir vigorously to completely disperse the emulsion, then add 1 g of Intechem-06 methanol solution of 3% by weight, and finally add 80 g of Cu(NO 3 ) 2 , and vigorously stirred for 30 minutes to obtain the weighted drag reducing fluid of the present invention with a density of 1.73g / cm 3 .

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Abstract

The invention discloses a weighting water-based fracturing drag reducer. The weighting water-based fracturing drag reducer comprises a base solution and a weighting agent, wherein the base solution comprises the following components in percentage by weight: 0.02%-0.1% of drag reducer, 0.5%-0.1% of conditioning agent and the balance of water; and the weighting agent is one or a mixture of more of ZnCl2, Zn(NO3)2, CuC12 and Cu(NO3)2 in arbitrary proportions; and the drag reducer is an inverse emulsion, and the conditioning agent is a methanol solution of 3 percentage by weight of ethyoxyl non-ionic type fluorocarbon surfactant. The novel weighting material is added to the drag reducer, so that the density of the drag reducer is increased, and the liquid column weight of the drag reducer in a pipeline is increased, thus the construction pressure is effectively reduced, the construction risk is reduced, and the construction success is ensured.

Description

technical field [0001] The invention relates to a water-based fracturing drag reducing fluid in the field of production stimulation and transformation in the development process of oil and gas fields. technical background [0002] The buried depth of deep high-temperature reservoirs is very large. In addition to the high reservoir temperature, high formation pressure coefficients and large closure stress gradients often occur. The construction pressure is usually high when it is transformed, even exceeding the existing equipment. Construction pressure limit. For example, Well Wucan 1 in Tarim Oilfield has a well depth of more than 6,000 m and a formation pressure coefficient greater than 2.0. After calculation, it is found that if a conventional fracturing fluid system is used for fracturing, the operating pressure will reach 103 MPa, exceeding the working limit of existing fracturing equipment. For this type of reservoir, it is necessary to simultaneously reduce the fricti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
Inventor 李勇明赵金洲江有适张烈辉何弦桀贺扬
Owner SOUTHWEST PETROLEUM UNIV
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