Water acid-sensitivity deformation magnetic tracer function self-suspension propping agent and preparation method thereof

Abstract

The invention belongs to the technical field of oil-gas field fracturing production-increase propping agent preparation, and relates to a water acid-sensitivity deformation magnetic tracer function self-suspension propping agent and a preparation method thereof. The propping agent comprises an aggregate and a surface hydration layer, wherein the aggregate is one of magnetic rare earth composite resin, quartz sand or ceramsite and like material; the surface hydration layer is composed of three layers, the innermost layer is a cationic macromolecule inner polymer layer or a modifier layer, the middle layer is an anionic macromolecule outer polymer layer, and the outer layer is anti-caking agent. The propping agent has the acid-sensitivity deformation self-suspension function of producing buoyant force while encountering water and breaking gel to precipitate while encountering the acid, and a tracer function of monitoring flow guiding position of the propping agent through electromagnetic imaging; in the process of exerting the fracturing engineering on shale, compact oil-gas or coal bed base and like argillaceous plasticity micronano hole reservoir, the fracturing liquid with the propping agent has excellent flow guiding characters of suspension sand-adding of non-floating to the roof and not sinking to the bottom; the permeation is improved, the hurt is avoided, the propping agent is efficient and capable of increasing production, the construction cost is lowered, and the application prospect is wide.

Description

Technical field: [0001] The invention belongs to the technical field of proppant preparation for oil and gas field fracturing stimulation, and relates to a self-suspension proppant with water acid-sensitive deformation magnetic tracer function and a preparation method thereof. The self-suspension performance of the proppant is eliminated by the acid-breaking gel precipitation, which is beneficial to the flowback of the fracturing fluid and reduces the reservoir damage; and because the proppant contains electromagnetic rare earth materials, the electromagnetic monitoring and imaging technology can be used to directly describe the position of the fracture where the proppant is located , so that the proppant has a magnetic tracer function; the proppant has characteristics in the tracer function of the composite material formula, the coating preparation process, the gel breaking and flowback construction method, and the electromagnetic imaging monitoring of the position of the prop...

AI Technical Summary

Problems solved by technology

[0003] In recent years, the price of crude oil has continued to fall, the cost of mining has been tightened, and the formation water and surface water in conventional fracturing fluids have poor sand-carrying capacity and a large amount of filtration; natural guar gum and guar gum derivatives need to be added with buffers, fungicides, scale inhibitors, Various reagents such as emulsifiers, auxiliary dispersants, wetting agents, crosslinking agents, clay stabilizers, etc., and various compatibility tests such as water sensitivity, acid sensitivity, alkali sensitivity, salt sensitivity, speed sensitivity, pressure sensitivity, etc.; slippery water It consumes a lot of water resources, and the sand carrying capacity cannot meet the needs of large-scale sand addition, and the sand addition is uneven; organic / inorganic jelly, cross-linked polymer, VES, cross-linked foam, etc. will cause formation adsorption, residue and other damage, reducing penetration In addition, conventional proppants limit the growth and extension of fractures. In conventional fracturing, small particle size sand is generally added first, and then large particle size is added to gradually increase the sand ratio. The fracturing sand will settle quickly in slippery water. It will cause a "big belly" phenomenon; conventional fracturing can only effectively support 60%-70% of fractures, and the proppant cannot effectively migrate to the deep part of the fracturing fracture; conventional fracturing improves the viscosity of the fracturing fluid and the pump rate to improve the suspension of sand , will increase equipment load and chemical consumption; using small particle size proppant to improve sand suspension for fracturing will cause proppant to be embedded in the formation and reduce reservoir conductivity; low-density proppant has low strength, and high-density proppant The disadvantages of fast settlement and high price of coated sand, there is a contradiction between density, strength and price

The existing proppants can be inhaled into the lungs and cause silicosis, lung cancer and other diseases, reduce the quality of drinking water for residents, and endanger the health of drilling workers and surrounding residents. High-strength functional water with high temperature resistance, high salt resistance, and shear resistance The self-suspension proppant with magnetic tracer function is coated with resin to reduce dust and debris, and at the same time, it is coated with water-soluble expansion resin, which has the effect of reducing resistance, and the half-length of the crack is longer, so it can be transported farther away, and basically transported to the target In the oil area, there is no need for thickeners and enhancers, and clear water fracturing can be achieved, reducing the amount of chemicals used, reducing the overall cost of fracturing, simplifying the fracturing process, improving efficiency, and increasing oil and gas production. The existing functional water is acid-sensitive Deformation magnetic tracer function Self-suspension proppant is not strong enough to suspend sand, and its compressive strength and acid and alkali resistance are insufficient. At present, there is no effective high-strength water-acid-sensitive deformation magnetic tracer with high temperature resistance, high salt resistance, and shear resistance. Preparation of functional self-suspending proppant and fracturing construction method

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