阅读说明：本技术 一种水驱井治理用双交联颗粒调堵剂 (Double-crosslinking particle plugging agent for water drive well treatment ) 是由 祝绍功 周万富 王鑫 刘向斌 周泉 李国� 乔岩 刘兆海 于 2020-06-28 设计创作，主要内容包括：本发明涉及油田化学领域,提供一种水驱井治理用双交联颗粒调堵剂,为了有效控制水驱区块厚油层内低效无效循环,进一步挖潜剩余油,实现油藏深部调堵而研制。本发明按重量百分比由下列成分组成：8-15%聚合物单体A和聚合物单体B共混物,1-1.5%矿聚物纳米粒子,0.1-0.5%引发剂,0.1-0.5%交联剂,余量为水。本发明适用性良好,稳定性高,为低效无效循环厚油层内综合治理,提供了技术支持。(The invention relates to the field of oilfield chemistry, and provides a double-crosslinking particle plugging control agent for water-flooding well treatment, which is developed for effectively controlling low-efficiency ineffective circulation in a thick oil layer of a water-flooding block, further excavating residual oil and realizing deep plugging control of an oil reservoir. The invention comprises the following components by weight percent: 8-15% of polymer monomer A and polymer monomer B blend, 1-1.5% of mineral polymer nano particles, 0.1-0.5% of initiator, 0.1-0.5% of cross-linking agent and the balance of water. The invention has good applicability and high stability, and provides technical support for comprehensive treatment in inefficient ineffective circulation thick oil layers.)

1. The utility model provides a water drive well is administered and is transferred stifled agent with pair cross-linking granule which characterized in that: which comprises the following components in percentage by weight: 8-15% of polymer monomer A and polymer monomer B blend, 1-1.5% of mineral polymer nano particles, 0.1-0.5% of initiator, 0.1-0.5% of cross-linking agent and the balance of water.

2. The double-crosslinked particle profile control agent for water-flooding well treatment according to claim 1, characterized in that: the nano particle of the mineral polymer is artificial Laponite.

3. The double-crosslinked particle profile control agent for water-flooding well treatment according to claim 1, characterized in that: the polymer monomer A can be one or a combination of any of acrylic acid, methacrylic acid and methyl propane sulfonic acid.

4. The double-crosslinked particle profile control agent for water-flooding well treatment according to claim 1, characterized in that: the polymer monomer B can be one or the combination of any several of acrylamide, methacrylamide and acrylonitrile.

5. The double-crosslinked particle profile control agent for water-flooding well treatment according to claim 1, characterized in that: the initiator is water-soluble inorganic initiator, and can be one or the combination of any several of ceric ammonium nitrate, 2-ketoglutaric acid and ammonium persulfate.

6. The double-crosslinked particle profile control agent for water-flooding well treatment according to claim 1, characterized in that: the crosslinking agent is one or the combination of two of N, N' -methylene bisacrylamide and triallyl isocyanurate.

Technical Field

The invention relates to the field of oilfield chemistry, and provides a double-crosslinking particle profile control agent for water-flooding well treatment.

Background

At present, the conventional profile control system can aggravate in-layer particle dissolved pores, so that a new interparticle pore channeling channel appears, the problem of injection-production ineffective injection-production bypass flow in a production zone is prominent, the traditional polymer particles have overlarge cross-linking density in the profile control and plugging process, the water absorption is insufficient, the original structural strength is difficult to maintain after the through hole, and the effective solution of the deep oil reservoir pore channel plugging problem is not facilitated.

The invention aims to solve the problems and provides a double-crosslinking particle plugging agent: the water-absorbing expansibility is good, the deformation can be restored, the elastic deformation restoration capability can still be maintained in the process of repeated expansion, compression, re-expansion and re-compression in the process of repeatedly passing through the stratum environment, the inherent strength of particles is maintained, effective plugging can still be formed after the deep oil reservoir is reached, the long-term thermal stability level is high, and the subsequent sustainability effect of profile control can be ensured.

Disclosure of Invention

The invention aims to provide a double-crosslinking particle plugging agent for water-drive well treatment, which has good water absorption expansibility and supportability, is beneficial to prolonging the final swelling period, increasing the effective time and inhibiting the formation of new interparticle hole cross flow channels.

The technical scheme of the invention is realized by the following measures: a double-crosslinking particle profile control agent for water drive well treatment comprises the following components in percentage by weight: 8-15% of polymer monomer A and polymer monomer B blend, 1-1.5% of mineral polymer nano particles, 0.1-0.5% of initiator, 0.1-0.5% of cross-linking agent and the balance of water.

The nano particle of the mineral polymer is artificial Laponite.

The polymer monomer A can be one or a combination of any of acrylic acid, methacrylic acid and methyl propane sulfonic acid.

The polymer monomer B can be one or the combination of any several of acrylamide, methacrylamide and acrylonitrile.

The initiator is water-soluble inorganic initiator, and can be one or the combination of any several of ceric ammonium nitrate, 2-ketoglutaric acid and ammonium persulfate.

The crosslinking agent is one or the combination of two of N, N' -methylene bisacrylamide and triallyl isocyanurate.

The invention relates to a double-crosslinking particle plugging agent for water drive well treatment, which has the following action principle:

according to the analysis of chemical structure, the double-crosslinked particle polymer is a crosslinked polymer containing hydrophilic groups and hydrophobic groups in the molecule. The metal ions at one end and water molecules form coordination hydration, the negative ion group containing oxygen atoms grasps other water molecules through hydrogen bonds, and the hydrophobic end is just exposed outside to form a ring barrier.

In addition, the system is introduced with nanometer clay particle, which has structure similar to natural montmorillonite and 2:1 layered silicate structure, and has two silicon-oxygen tetrahedrons with shared oxygen atoms on two sides of the magnesium-oxygen octahedron, wherein partial bivalent magnesium atoms are replaced by monovalent lithium atoms, so that the particle surface has permanent charge. The particle size of the Laponite particles is monodisperse, with lamella diameters of about 25-30nm and thicknesses of about 1 nm. Laponite is insoluble in water, but dispersed in water by exfoliation to form a colorless transparent colloidal dispersion. The Laponite dispersion gels over time as the sheet surface is negatively charged and the edges positively charged.

The Laponite particles are dispersed suspended in water and have a large surface area. Polar groups on the molecules of the acryl polymer are easily adsorbed on the surface of the Laponite particles to form a certain aggregate. In the monomer polymerization process, the Laponite particles are uniformly dispersed in a polymerization system, and the nano structure of the Laponite particles shows excellent thixotropy, dispersibility, suspensibility and thickening property, so that polymer molecular chains are fully stretched, and the obtained hydrogel particle system shows good water absorbability and elastic recovery capability.

The invention has the following advantages:

1) the method has long final expansion period, is beneficial to prolonging the effective time, and provides technical support for effectively controlling inefficient ineffective circulation and further excavating a submerged thick oil layer;

2) the invention has good water absorption expansibility and supportability, can effectively support the stratum structure interface while injecting, inhibit the formation of new interparticle hole cross flow channels, and can effectively plug the pore channels with larger size;

3) the polymer has good mechanical property and secondary crosslinking characteristic, compared with the traditional polymer water-swelling particles, the strength after passing through the holes is obviously weakened, and the deformation generated by the original stress is recovered again through the synergistic effect of reversible electrostatic force and hydrogen bonds in the particles.

Description of the drawings: FIG. 1 is a water swelling factor curve of a sample SHP-1 in example 1 of the present invention; FIG. 2 is a graph showing the pressure change of the holes of the SHP-1 (40 days of final swelling) and SHP-1 (40 days of final swelling after 180 days of constant-temperature 45 ℃ soaking) samples obtained in example 1 of the present invention.

The specific implementation mode is as follows: the invention is further illustrated by the following examples: a double-crosslinking particle profile control agent for water drive well treatment comprises the following components in percentage by weight: 8-15% of polymer monomer A and polymer monomer B blend, 1-1.5% of mineral polymer nano particles, 0.1-0.5% of initiator, 0.1-0.5% of cross-linking agent and the balance of water.

The nano particle of the mineral polymer is artificial Laponite.

The polymer monomer A can be one or a combination of any of acrylic acid, methacrylic acid and methyl propane sulfonic acid.

The polymer monomer B can be one or the combination of any several of acrylamide, methacrylamide and acrylonitrile.

The initiator is water-soluble inorganic initiator, and can be one or the combination of any several of ceric ammonium nitrate, 2-ketoglutaric acid and ammonium persulfate.

The crosslinking agent is one or the combination of two of N, N' -methylene bisacrylamide and triallyl isocyanurate.