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CN-122012072-A - Armored sand-ceramsite bimodal propping agent based on performance matching and preparation method and application thereof

CN122012072ACN 122012072 ACN122012072 ACN 122012072ACN-122012072-A

Abstract

The invention discloses an armored sand-ceramsite bimodal proppant based on performance matching and a preparation method and application thereof, and relates to the technical field of petroleum and natural gas exploitation. The proppant comprises ceramsite and armoured sand compounded according to the mass ratio of (20:80) - (60:40), wherein the volume density ratio of the ceramsite to the armoured sand is 0.9-1.1, the median particle size ratio is 1.5-3.0, the proppant can be ensured to be uniformly and stably conveyed to a target crack, the ceramsite is enabled to form a bearing framework, the armoured sand is enabled to fill gaps, and a synergistically stable composite support structure is constructed. The invention adopts four-in-one performance matching design of volume density, crushing rate, acid solubility and particle size, the obtained propping agent has better crushing resistance, acid corrosion resistance and long-term diversion performance than the conventional propping agent, and the preparation cost is low, so that the defects of mismatching of the performance of the conventional propping agent, system failure and the like can be overcome, and the propping agent has wide application prospect in hydraulic fracturing construction of oil and gas fields.

Inventors

  • WANG WANLI
  • HAN XINXIA
  • WANG YUSHEN

Assignees

  • 新密市万力实业发展有限公司

Dates

Publication Date
20260512
Application Date
20260227

Claims (8)

  1. 1. The armored sand-ceramsite bimodal propping agent based on performance matching is characterized by comprising ceramsite and armored sand compounded according to the mass ratio of (20:80) - (60:40); the ceramsite is sintered ceramsite or surface modified ceramsite; The armored sand is quartz sand reinforced by a coating, and the coating comprises 3-10% of resin matrix, 0.1-2.0% of silane coupling agent and 0-2% of functional modified filler according to the total mass of the armored sand.
  2. 2. The performance-matching-based bimodal proppant of armored sand-ceramsite of claim 1, wherein the particle size class of quartz sand and the particle size class of ceramsite are at least one of 16/30 mesh, 20/40 mesh, 30/50 mesh, 40/70 mesh, 70/140 mesh.
  3. 3. The performance-matching-based armoring sand-ceramsite bimodal proppant according to claim 2, wherein the volume density ratio of the ceramsite to the armoring sand is 0.9-1.1, and the median particle size ratio of the ceramsite to the armoring sand is 1.5-3.0.
  4. 4. The performance-matching based armored sand-ceramsite bimodal proppant of claim 1 wherein said resin matrix comprises an epoxy resin, polyurethane resin, phenolic resin, or modified blend; the modified blend comprises at least one of a modified epoxy resin, a modified polyurethane resin and a modified phenolic resin; the silane coupling agent is KH-550 coupling agent or KH-560 coupling agent; The functional modified filler is at least one of nano silicon dioxide, rubber particles and acid-resistant filler.
  5. 5. The method for preparing the armored sand-ceramsite bimodal proppant based on performance matching according to any one of claims 1-4, which is characterized by comprising the following steps: S1, screening quartz sand and sintered ceramsite to a target particle size level, and drying until the moisture is less than 0.5%; S2, preparing coating liquid, atomizing and spraying the coating liquid on the surfaces of the quartz sand and the sintered ceramsite obtained in the step S1, solidifying, and cooling to obtain armored sand and surface modified ceramsite; And S3, placing the armored sand and the surface modified ceramsite or the sintered ceramsite obtained in the step S1 into a mixing three-dimensional mixer, and mixing for 10-30 min to obtain the armored sand-ceramsite bimodal proppant.
  6. 6. The method for preparing the armored sand-ceramsite bimodal proppant based on performance matching according to claim 5, wherein the step S2 specifically comprises: S21, dissolving a resin matrix, a coupling agent and a functional modified filler in a solvent, and uniformly stirring to obtain a coating liquid, wherein the quartz sand and the sintered ceramsite obtained in the step S1 are preheated to 60-100 ℃; And S22, atomizing and spraying the coating liquid on the surfaces of the preheated quartz sand and the sintered ceramsite in a stirring or fluidization state, solidifying for 40-150 min at 100-150 ℃ after spraying, cooling to room temperature, and screening out the agglomerate to obtain the armored sand-ceramsite bimodal propping agent.
  7. 7. The method for preparing the armored sand-ceramsite bimodal proppant based on performance matching according to claim 6, wherein the solvent is acetone or ethanol.
  8. 8. The application of the armored sand-ceramsite bimodal propping agent based on performance matching in hydraulic fracturing construction of oil and gas fields according to any one of claims 1-4.

Description

Armored sand-ceramsite bimodal propping agent based on performance matching and preparation method and application thereof Technical Field The invention relates to the technical field of petroleum and natural gas exploitation, in particular to an armored sand-ceramsite bimodal proppant based on performance matching, and a preparation method and application thereof. Background In the exploitation process of unconventional oil and gas resources such as shale gas, compact oil and the like, a hydraulic fracturing technology has become a key core technology for forming artificial cracks, opening oil and gas flow channels and realizing economic exploitation of resources due to the inherent characteristics of low porosity and low permeability of a reservoir. After the fracturing construction is finished, the propping agent is pumped into the artificial cracks and supports the cracks to keep an open state, a stable oil gas seepage channel is continuously constructed, and the transformation effect of the fracturing operation and the long-term productivity of the oil gas well are directly determined. At present, propping agents widely applied in industries are mainly divided into two types, namely high-performance ceramsite and low-cost natural quartz sand, wherein the two types are respectively difficult to reconcile, but the two types have contradictions between performance and cost, so that the requirements of deep unconventional oil gas exploitation on the comprehensive performance of the propping agents can not be met simultaneously; on the other hand, the natural quartz sand is widely available and low in cost, is the most widely applied low-cost propping agent at present, but has lower strength, is easy to break in a deep high-pressure environment, and broken particles can block oil gas flow channels, so that the crack flow conductivity is rapidly attenuated, the requirement of deep unconventional oil gas long-term exploitation cannot be met, and the natural quartz sand is only suitable for fracturing operations of shallow and low-pressure reservoirs. In order to balance the performance and cost of propping agents, it is generally tried in industry to simply and physically mix ceramsite with natural quartz sand to form a composite propping agent so as to achieve the aim of combining high performance with low cost. However, the simple mixed composite propping agent has poor effect, and the ceramsite and the natural quartz sand are obviously mismatched in key performance parameters such as volume density, breaking rate, acid solubility, particle morphology and the like, so that a series of fatal defects are caused, namely, the two types of particles are easily distributed unevenly due to gravity difference caused by the volume density and particle morphology difference in the pumping process and cannot be uniformly paved in an artificial crack, and in the underground long-term service process, non-collaborative breaking and selective corrosion can occur due to the mismatch of the breaking rate and the acid solubility, and finally, the composite propping agent structure is caused to fail prematurely, so that the long-term diversion capacity of the composite propping agent is even lower than the effect of singly using the ceramsite or the quartz sand, and the expected synergistic aim cannot be realized. Aiming at a series of problems caused by unmatched component performances of the simple physical mixed propping agent, the prior art also tries to improve the mixed particles through a resin coating method, for example, the Chinese patent application with the application number 202511218828.9 and the publication number CN121086776A filed by the general industrial development limited company of the Xinmi city on the 8 th month 28 day of 2025 are disclosed, and the high-performance low-diversion-attenuation composite coated propping agent and the preparation method thereof are disclosed. However, the core of the scheme is to prepare composite particles with uniform structures, the process is relatively complex, the unmatched problems of different components in terms of volume density, breakage rate, acid solubility and particle morphology are not solved basically, the core pain points such as gravity difference, non-collaborative breakage under long-term bearing pressure, selective corrosion in complex formation fluid and the like in the pumping process cannot be solved from the system level, the problem of premature failure of the structures still occurs, and the collaborative work of the composite propping agent in the full service period cannot be realized. Besides the technical scheme of coating the mixed particles by the resin, the international front-end proppant technology actively explores an improvement path aiming at the problems that the performance and cost of the proppant are difficult to consider and the composite components are easy to have performance mismatch, and the technology mainly develops towar