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A method for directly recovering and reusing fracturing flowback fluid

A fracturing flowback fluid, direct technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as storage of fracturing flowback fluid and glue back without consideration, and achieve excellent sand-carrying performance, The effect of stable performance and low implementation difficulty

Active Publication Date: 2020-12-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of fracturing fluid only considers the temperature resistance of the remixed fluid, and does not consider the storage problem of the fracturing flowback fluid that is easily affected by bacteria; the problem of gel return caused by the incomplete gel breaking of the fracturing flowback fluid; The sand-carrying performance of the fracturing fluid during the construction process; the problem of repeated use, and the impact of changes in the content of ions, organics, inorganics, and impurities in the water for mixing fluids on the system, there are some specific problems in the implementation process. series of questions

Method used

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  • A method for directly recovering and reusing fracturing flowback fluid

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Effect test

Embodiment 1

[0043] A new Triassic well (1#) reservoir has a buried depth of 1670m and a formation temperature of 51°C. After the first stage of fracturing flowback fluid is recovered on site, the sand removal tank is settled and treated, and then transferred to the liquid storage tank. During the transfer process, 0.08% alkyl dimethyl ammonium acetate fungicide is added for centralized storage for 6 days; the second stage Before fracturing, add 0.08% polyferric sulfate and 0.16% EDTA disodium before preparing fracturing fluid, use cement truck to circulate for 5 minutes, then add 0.2% citric acid, and circulate for 5 minutes; then add 0.3% hydroxypropyl guanidine in sequence according to the designed formula Glue, 0.5% perfluoroalkyl carboxylic acid drainage aid, 0.5% potassium chloride, and finally 0.8m 3 / min displacement cycle for 10min to form guar gum base liquid. During fracturing construction, add 0.3% cross-linking agent (triethanolamine borate: borax = 1:3) to form gel to carry ...

Embodiment 2

[0045] A new Triassic well (2#) has a reservoir with a depth of 2050m and a formation temperature of 70°C. After recovering the first-stage fracturing flowback fluid on site, the desander tank was settled and treated, and then transferred to the fluid storage tank. During the transfer process, the Add 1.0% potassium sorbate bacterial agent and store for 10 days; before the second stage of fracturing, add 0.05% glucose and 0.10% tetrasodium EDTA before preparing the fracturing fluid, use a cement truck to circulate for 10 minutes, then add 0.3% glucose acid, circulated for 5min; then add 0.3% carboxymethyl hydroxypropyl guanidine gum, 0.5% perfluorooctyl sulfonate tetraethylamine amide drainage aid, 0.5% polyepichlorohydrin-dimethylamine in sequence according to the designed formula, and finally Use 1.0m 3 / min displacement cycle for 5min to form the base liquid. During fracturing construction, add 0.5% cross-linking agent (ethylene glycol borate: sodium borate = 1:8) to form ...

Embodiment 3

[0047] A new Triassic well (2#) has a reservoir with a depth of 1800m and a formation temperature of 64°C. After recovering the first-stage fracturing flowback fluid on site, the desanding tank was settled, and then transferred to the fluid storage tank. During the transfer process, the Add 1.0% butylparaben fungicide and store for 10 days; before the second stage of fracturing, add 0.06% polychlorinated chlorine chloride and 0.12% EDTA before preparing the fracturing fluid, use cement truck to circulate for 8 minutes, and then add 0.2% Sodium bicarbonate, circulate for 5 minutes; then add 0.2% carboxymethyl guar gum, 0.4% perfluoropropyl alkyl sulfonate drainage aid, 0.3% polyepichlorohydrin-dimethylamine clay stabilizer according to the designed formula , and finally adopt 4.0m 3 / min displacement cycle for 15min to form the base fluid. During fracturing construction, add 0.4% cross-linking agent (ethylene glycol borate: sodium borate = 1:4) to form gel to carry proppant (q...

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Abstract

The invention discloses a method for directly recycling and reusing a fracturing flow-back fluid. The method comprises the following steps that settling and sand removing are carried out, wherein a settling tank is used for removing a propping agent and mechanical impurities in a fracturing flow-back fluid, and then the treated fracturing flow-back fluid is poured into a tank for storage; sterilization and preservation are carried out, wherein a bactericide is added into a liquid storage tank for inhibiting bacterial reproduction; flocculating and shielding are carried out, wherein a flocculating shielding agent is added before liquid preparation for shielding metal high-valence ions; the pH value is adjusted for facilitating the tackifying of a thickening agent under a weak acidic condition; then additives such as the thickening agent, a discharge aiding agent, a clay stabilizer and the like are sequentially added according to a design formula; circulation is carried out for 5-10min for forming a base solution; a cross-linking agent is added in a construction process for forming a gel; a gel breaker is added in a construction last period; after fracturing is completed, a well is closed for discharging; and the fracturing flow-back liquid is recycled and utilized repeatedly and circularly. According to the treatment method, the safety and environmental protection pressure caused by large-scale fracturing of oil fields can be effectively relieved, water resources are saved, and the economic benefits and social benefits are remarkable.

Description

technical field [0001] The invention belongs to the field of oil field stimulation, in particular to a method for directly recovering and reusing fracturing flowback fluid. Background technique [0002] Fracturing has been developed rapidly and widely used as the main production and injection measures of oil and gas reservoirs. Fracturing is the use of pressure to open formations to form fractures and support them with proppant to reduce fluid flow resistance and increase production and injection measures. The purpose of fracturing is to form fractures with conductivity in the formation. The fracturing fluid used determines the fracturing effect to a large extent. At the same time, there are certain requirements for the viscosity of the fracturing fluid so that it can Become a low-viscosity fluid that is easy to flow back to avoid damage to oil and gas layers in the formation. [0003] Hydraulic fracturing technology is a key technology for low-permeability reservoir recon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
CPCC09K8/605C09K8/685C09K8/885C09K8/90C09K2208/24C09K2208/26
Inventor 范华波李忠兴慕立俊赵振锋李宪文薛小佳王成旺吴江李楷郭钢刘锦张翔
Owner PETROCHINA CO LTD
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