Rapidly hydrated liquid guanidine gum and fracturing base fluid containing same

Abstract

The invention discloses rapidly hydrated liquid guanidine gum. The rapidly hydrous liquid guanidine gum consists of the following components by weight percentage: 16-49.6% of disperse phase, 50-83.3% of dispersion media and 0.4-10% of suspension stabilizers. The invention also discloses a fracturing base fluid. The fracturing base fluid is prepared by mixing the rapidly hydrated liquid guanidine gum with water at a weight ratio of 1: (50-500). The rapidly hydrated liquid guanidine gum can be rapidly swollen to be sticky and has excellent suspension stability. The preparation method is simple and easily available in raw materials, thereby facilitating large-scale production.

Description

technical field [0001] The invention relates to the field of improvement of oilfield production stimulation measures, in particular to a rapidly hydrating liquid guar gum suitable for a continuous mixed fracturing process and a fracturing base fluid containing the liquid guar gum. Background technique [0002] With the large-scale exploration and development of unconventional oil and gas reservoirs, cluster wells and horizontal wells "factory" and "thousand square sand and thousand square liquid" large-scale fracturing models will become important means of reservoir reformation. Fluid preparation is an important process in fracturing. At present, domestic preparation of fracturing fluid base fluid often adopts the method of batch mixing, that is, guar gum and its derivatives and additives such as fungicides, drainage aids, clay stabilizers, soda ash, etc. Mix with water in a reservoir. There are the following main problems in this liquid preparation method: (1) The addition...

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Problems solved by technology

There are the following main problems in this liquid preparation method: (1) The addition of a large amount of guar gum and its derivative powder particles and other powder additives will generate chemical powder dust, which may cause potential harm to the health of construction workers. For example, respiratory allergies and / or respiratory allergies; (2) Base liquid overflow due to human factors during liquid preparation or leakage of base liquid due to pouring tanks during construction will cause waste of base liquid and increase environmental impact. (3) The fracturing fluid base fluid or polymer residue remaining at the bottom of the storage tank after construction brings cleaning and disposal problems, especially how to dispose of the waste fluid to meet strict discharge standards so as to reduce the harm to the environment ; (4) The large number of liquid tanks, the large area occupied by the site, the high labor intensity, and the long time of liquid preparation cause liquid corruption, etc.

The existing foreign liquid guar gum system still has the following problems: (1) Although the suspension effect is good for a period of time, it is difficult to pump it into the continuous mixing vehicle due to the high viscosity and poor fluidity. Poor pumpability; (2) Under the conditions of good fluidity and pumpability, the suspension effect is poor, causing uneven dispersion of guar gum particles in the liquid guar gum suspension system. It is difficult to ensure the uniformity of viscosity in the base fluid, which affects the quality of fracturing construction; (3) It is difficult for the liquid guar gum system to reach 85-90% of the maximum base fluid viscosity within 3-5 minutes, that is, the hydration swelling time is too long, and the increase (4) Dispersion media such as diesel oil, kerosene, low-molecular alcohols, ethers, alcohol ethers and other substances introduced into the liquid guar gum have defects such as low flash point and strong flammability, which greatly increases the safety of the construction site. Risk; (5) The cost of materials such as dispersion medium and suspension stabilizer for preparing liquid guar gum system is high

[0004] In summary, there is a lack of a liquid guar gum system in the field that has both excellent fast swelling viscosity, suspension effect, fluidity, construction safety and cost advantages

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