Preparation method of High-temperature water base fracturing fluid

A high-temperature, fracturing fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of difficulty in realizing large-scale fracturing construction operations at sea, limited fresh water carried by work vessels, and fracturing vessel docking time. To ensure the effect of fracturing stimulation, improve the effect of fracturing stimulation, and facilitate the recovery of permeability

Active Publication Date: 2014-08-06
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the conventional fracturing fluid system is still used in offshore fracturing, which requires fresh water for liquid distribution. Therefore, a large amount of fresh water needs to be stored from the wharf, and the fracturing ship stays on the shore for too long, which wastes a lot of construction time and increases Production costs; in addition, due to the limited amount of fresh water carried by workboats, it is difficult to realize large-scale fracturing operations at sea
[0004] A major feature of offshore oil and gas fields is that they have a large amount of seawater resources. However, due to the serious impact of calcium and magnesium plasma on the performance of fracturing fluids, seawater cannot be directly used to configure conventional fracturing fluid systems.

Method used

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  • Preparation method of High-temperature water base fracturing fluid
  • Preparation method of High-temperature water base fracturing fluid

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preparation example Construction

[0024] Preparation of thickener

[0025] 2-acrylamide-2-methylpropane sulfonate, acrylamide, dimethyl diallyl ammonium chloride and methacryloyloxyethyl trimethyl ammonium chloride in a mass ratio of 15:40:8 : 5 to make a 30% aqueous solution, keep the temperature at 60°C, fill with nitrogen for 30 minutes, add a redox system (ammonium persulfate: bisulfite = 1:2) and react for 8 hours to obtain a highly viscous transparent jelly , dried and crushed to obtain a thickener.

Embodiment 1

[0027] Pour 972.7 parts of seawater taken from the CB326 platform in the Shengli Sea Area of ​​Bohai Bay into the Wuyin mixer, start stirring, and adjust the speed (about 600r / min); slowly add 5 parts of thickener into the seawater, Stir for 10 minutes; add 6 parts of clay stabilizer and 10 parts of drainage aid, continue to stir for 15 minutes to make the thickener swell completely; continue to stir, add 0.3 parts of gel breaker, and then slowly add 6 parts of crosslinking agent until the vortex When it disappears and the liquid level rises slightly, stop stirring, and the finished product of high-temperature-resistant seawater-based fracturing fluid will be formed.

[0028] The cross-linking agent is prepared by zirconium oxychloride, chromium chloride, glycerin and water according to the mass ratio of 5:0.2:0.6:60.

[0029] The demulsification aid is made of polyoxyethylene alkyl alcohol ether nonionic surfactant, fluorocarbon surfactant, quaternary ammonium salt surfactant...

Embodiment 2

[0034] Pour 949.9 parts of seawater taken from the vicinity of BH7 well in the Binhai block of Dagang, Bohai Bay into the Wuyin mixer, start stirring, and adjust the speed (about 1000r / min); slowly add 8 parts of the thickener that has been weighed In seawater, stir for 10 minutes; add 10 parts of clay stabilizer and 12 parts of drainage aid, continue to stir for 20 minutes to make the thickener swell completely; continue to stir, add 0.1 part of gel breaker, and then slowly add 20 parts of crosslinking agent , until the vortex disappears and the liquid level rises slightly, stop stirring, and a high-temperature-resistant seawater-based fracturing fluid product will be formed.

[0035] The crosslinking agent is prepared by ferric chloride, zirconium tetrachloride, chromium chloride, formaldehyde, glycerin and water according to the mass ratio of 2:10:0.8:0.05:3:70.

[0036] The demulsification aid is made of polyoxyethylene alkyl alcohol ether nonionic surfactant, fluorocarbon...

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Abstract

The invention relates to a high-temperature water base fracturing fluid and a preparation method thereof. The fracturing fluid is prepared from the following additives by weight: 0.45-1.0% of a thickening agent, 0.6-1.5% of a clay stabilizer, 0.6-1.5% of an emulsion breaking cleanup additive, 0.01-0.03% of a gel breaking agent, 0.6-2.0% of a crosslinking agent and the balance of sea water, wherein the total sum weight percentages of the components is 100%. The fracturing fluid has the advantages of good sand carrying capability, good heat resistant and shearing resistant performances, good compatibility with formation fluid and small reservoir damage; seawater can be used directly to prepare the solution; and conventional liquid dispensing equipment and process are employed to solve the problem of lack of freshwater in offshore fracturing construction. The invention improves working efficiency of offshore fracturing, reduces the cost, and lays the foundation for the large-scale offshore fracturing operation.

Description

technical field [0001] The invention relates to a preparation method of high-temperature-resistant seawater-based fracturing fluid, which can directly use seawater for liquid preparation, and the temperature and shear resistance of the system can reach 160°C, which can meet the technical requirements for fracturing reconstruction of offshore high-temperature reservoirs. Background technique [0002] Exploration efforts in offshore blocks are increasing year by year. Among the wells that have been drilled so far, quite a few of them have a depth of more than 3,000 meters and a temperature gradient of 3.78°C / m. The oil layers belong to tight mudstone, argillaceous siltstone, and clastic rock. The reservoir of this type of oil well is tight, with low porosity, poor permeability and low natural productivity. It is necessary to carry out fracturing stimulation for such deep well tight oil reservoirs to improve the overall effect of oil and gas field exploration and development. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/604C09K8/665C09K8/68C09K8/685C09K8/882C09K8/885C09K8/887C09K2208/26
Inventor 宋有胜徐鸿志王宇宾郝志伟赵文娜汤发明王雪莹叶松滨
Owner BC P INC CHINA NAT PETROLEUM CORP
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