Gel breaking solution and use thereof

Abstract

The invention provides a gel breaking solution. The gel breaking solution comprises, by weight, 10-30% of a coagulant, 1.0-3.0% of a flocculating agent, 1.0-5.0% of a solid-liquid separating agent and the balance water. The gel breaking solution has no corrosivity, no fluorescence, no chemical toxicity and no biotoxicity, is biodegradable and environmentally friendly, solves the technical problems of gel breaking, solid-liquid separation and recycling of a waste low-solid phase sulphonated polymer mud in a Changqing large-scale well drilling construction process and greatly reduces a well drilling comprehensive cost.

Description

technical field [0001] The invention relates to the technical field of oilfield drilling fluid gel breaking, in particular to a gel breaking fluid and an application thereof. Background technique [0002] The Changqing Oilfield located in the Ordos Basin drills and completes thousands of wells every year, and generates millions of cubic meters of drilling fluid waste, which is basically piled up or buried in the well field, causing adverse impacts on the environment, for example, it may cause infiltration into the formation , affecting drinking water sources, soil and animal and plant growth. At the end of 2014, the new "Environmental Protection Law" was implemented, and then China National Petroleum Corporation issued the "Drilling Waste Fluid and Drill Cuttings Treatment Management Regulations (Provisional)", and Changqing Oilfield Branch issued the "Changqing Oilfield Drilling Waste Fluid and Drilling Cuttings Disposal Management Measures”, Ordos City also issued relevan...

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Problems solved by technology

[0003] In order to overcome the problems of no place to discharge waste low-solid polysulfonate drilling fluid and environmental pollution after the implementation of drilling fluid "not falling to the ground", the present invention proposes a gel breaking fluid, which can completely break the waste low-solid phase polysulfonate drilling fluid and remove it. Stable, the solid-liquid layer is obvious after the gel is broken, the particle size of the broken colloid is large, strong, and it is in the shape of a micelle, no additional equipment is needed, the solid-liquid can be completely separated by using the existing solid control system of the well team, and the solid-liquid separation The liquid phase can be directly reused to prepare new drilling fluid, and the reuse rate reaches 100%. After the solid-liquid separation, the solid phase part is harmlessly treated by adding curing agent and drilling cuttings to meet the relevant environmental protection requirements.

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