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CN-122010369-A - Multistage desilication desalination device of high temperature high silicon oil field produced water retrieval and utilization

CN122010369ACN 122010369 ACN122010369 ACN 122010369ACN-122010369-A

Abstract

The invention discloses a multistage desilication desalting device for recycling high-temperature high-silicon oil field produced water, which relates to the technical field of oilfield produced water treatment, wherein pretreated oilfield produced water enters a cyclone separator through an input pipe, the top outlet end of the cyclone separator is communicated with the bottom inlet end of a desilication reaction mechanism, and the top outlet end of the desilication reaction mechanism is communicated with the top inlet end of a membrane desalting reactor. According to the invention, pretreated oilfield produced water enters the cyclone separator through the input pipe to be separated, the separated oilfield produced water tangentially flows into the silicon removal reaction mechanism through the first connecting pipe to form spiral upward water flow, silicon is removed from the oilfield produced water, the produced water is fully mixed with the silicon removal agent sprayed by the annular distribution pipe, the mass transfer efficiency is improved, the active seed crystal is driven to be uniformly dispersed, the seed crystal and the agent are ensured to be in omnibearing contact with the produced water, the generation of silicon slag is accelerated, the silicon slag is wrapped on the outer surface of the active seed crystal, and the silicon removal reaction is ensured to be fully carried out.

Inventors

  • MA WENKAI
  • SHI JINYU
  • LIU JUNLI
  • SHI JIE
  • FAN WEIKANG
  • WEI XINLIANG
  • WANG WEIXIN
  • CHEN YONG

Assignees

  • 克拉玛依曜诚石油科技有限公司

Dates

Publication Date
20260512
Application Date
20260416

Claims (9)

  1. 1. A multistage desilication desalting device for recycling high-temperature high-silicon oil field produced water is characterized in that the oilfield produced water is subjected to cooling, demulsification and deoiling pretreatment, an input pipe (2) is arranged at one side inlet end of a cyclone separator (1), the pretreated oilfield produced water enters the cyclone separator (1) through the input pipe (2), a discharging pipe (9) for discharging impurities is arranged at the bottom outlet end of the cyclone separator (1), the top outlet end of the cyclone separator (1) is communicated with the bottom inlet end of a desilication reaction mechanism (4) through a first connecting pipe (3), the top outlet end of the desilication reaction mechanism (4) is communicated with the top inlet end of a membrane desalting reactor (6) through a second connecting pipe (5), and a collecting pipe (7) is arranged at the bottom outlet end of the membrane desalting reactor (6); The silicon removal reaction mechanism (4) is characterized in that a mixing drum (402) which is mutually communicated with the first connecting pipe (3) is arranged at the inner bottom of the tank body (401), a medicine adding mechanism (8) for adding silicon removal medicines is arranged at the outer circumference of the mixing drum (402), a reaction drum (403) which is mutually communicated with the mixing drum (402) is arranged at the top of the mixing drum, a plurality of active seed crystals are added inside the reaction drum (403), oilfield produced water in the reaction drum (403), silicon slag generated by mixing the active seed crystals and the silicon removal medicines are wrapped on the outer surface of the active seed crystals, a spiral abrasion groove (409) is formed in the inner circumference of the reaction drum (403), a plurality of surface abrasion components for abrasion and update of the silicon slag on the surface of the active seed crystals are processed on the spiral abrasion groove (409), and a separation component is arranged at the top of the reaction drum (403).
  2. 2. The multi-stage desilication and desalination device for recycling water produced in high-temperature and high-silicon oil fields according to claim 1, wherein a collecting cover (408) is arranged at the top of the mixing cylinder (402), a supporting net (407) positioned between the mixing cylinder (402) and the reaction cylinder (403) is arranged on the collecting cover (408), and a second annular gap (419) for active seed crystals to enter the supporting net (407) is formed between the bottom of the reaction cylinder (403) and the collecting cover (408).
  3. 3. The multistage desilication and desalination device for recycling high-temperature high-silicon oil field produced water according to claim 1, wherein the dosing mechanism (8) is characterized in that an annular distribution pipe (802) is arranged on the outer circumference of the mixing drum (402), a plurality of drug outlet holes (803) communicated with the inside of the mixing drum (402) are uniformly formed in the annular distribution pipe (802) along the circumferential direction, a dosing pipe (801) communicated with the annular distribution pipe is arranged on the annular distribution pipe (802), and a desilication agent is added into the dosing pipe (801).
  4. 4. The multi-stage desilication and desalination device for recycling high-temperature high-silicon oil field produced water according to claim 1, wherein the surface abrasion component is characterized in that a fixed cylinder (410) is arranged on a spiral abrasion groove (409), a fixed column (414) is arranged inside the fixed cylinder (410), abrasion balls (412) are arranged on the fixed column (414), and a plurality of flexible abrasion wires (411) are arranged on the outer surface of the abrasion balls (412).
  5. 5. The multistage desilication desalination device for recycling high temperature and high silicon oil field produced water according to claim 4, wherein a spring (416) is arranged inside the fixed cylinder (410), one end of the spring (416) is fixedly connected with the inner bottom of the fixed cylinder (410), the other end of the spring (416) is connected with a separation sleeve (415), the separation sleeve (415) is slidably connected with the inner side of the fixed cylinder (410), a guide cover (413) is arranged on the separation sleeve (415), a through hole (417) is formed between the guide cover (413) and the separation sleeve (415), and an abrasion ball (412) penetrates through the guide cover (413) and the through hole (417) of the separation sleeve (415).
  6. 6. The multi-stage desilication and desalination device for recycling high-temperature high-silicon oil field produced water according to claim 1, wherein the separation component is characterized in that a conical cylinder (405) communicated with the reaction cylinder (403) is arranged at the top of the reaction cylinder, an interception net (404) for intercepting active crystals is arranged at the bottom of the conical cylinder (405), and a plurality of separation holes (406) for throwing out silicon slag on the outer surface of the active crystals are formed in the outer circumference of the conical cylinder (405).
  7. 7. The multistage desilication and desalination device for recycling high-temperature high-silicon oil field produced water according to claim 6, wherein a first annular gap (418) is formed between the interception net (404) and the top of the reaction cylinder (403), and active crystals in the reaction cylinder (403) enter the tank body (401) through the first annular gap (418).
  8. 8. The multistage desilication and desalination device for recycling water produced in high-temperature high-silicon oil fields as claimed in claim 1, wherein the active seed crystal is magnesium silicate seed crystal.
  9. 9. The multi-stage desilication and desalination device for recycling high-temperature high-silicon oil field produced water according to claim 1 or 3, wherein the desilication agent is magnesium oxide or magnesium chloride.

Description

Multistage desilication desalination device of high temperature high silicon oil field produced water retrieval and utilization Technical Field The invention relates to the technical field of oilfield produced water treatment, in particular to a multistage desilication and desalination device for recycling high-temperature high-silicon oil field produced water. Background With the development of oil fields entering the middle and later stages, the water yield rises year by year, and the water quality becomes more complex. Especially under the conditions of high temperature and high silicon (the typical temperature is more than 70 ℃, the SiO 2 concentration is more than 80mg/L, and the mineralization degree is more than 5000 mg/L), the traditional treatment process has the problems of serious scaling, low recycling rate and the like, and seriously influences the stability of a water injection system and the service life of equipment. The reuse of the high-temperature high-silicon oil field produced water is an important link of water saving, emission reduction and resource recycling of the oil field, the water quality has the characteristics of high temperature, high silicon content, complex components and the like, and desilication and desalination are core treatment procedures for realizing the effective reuse of the produced water. In the prior art, the problems that the pretreatment of the produced water of a high-temperature high-silicon oil field is not thorough, the silicon removal agent is unevenly mixed with the water body, the activity of the crystal seeds is lost due to the fact that the crystal seeds are easily wrapped by silicon residues in the long-term use process, the abrasion strength cannot be adaptively adjusted according to the state of the crystal seeds, and the like generally exist, so that the desilication effect is unstable, the crystal seed loss is large, the subsequent desalting unit is easily polluted by the residual silicon residues, the treatment efficiency is reduced, even faults such as equipment blockage are caused, the special treatment requirement of the produced water of the high-temperature high-silicon oil field is difficult to adapt to in the whole process, the efficient recycling rate of the produced water is restricted, and the development requirements of green environmental protection, energy conservation and consumption reduction of the oil field cannot be met. Disclosure of Invention The technical problem to be solved by the invention is to overcome the defects of the prior art, and provide a multistage desilication desalting device for recycling high-temperature high-silicon oil field produced water, which ensures that desilication reaction is fully carried out and prolongs the service life of seed crystal circulation. The technical scheme includes that cooling, demulsification and deoiling pretreatment are carried out on oilfield produced water, an input pipe is arranged at one side of an inlet end of a cyclone separator, the pretreated oilfield produced water enters the cyclone separator through the input pipe, a discharging pipe for discharging impurities is arranged at the bottom outlet end of the cyclone separator, the top outlet end of the cyclone separator is communicated with the bottom inlet end of a desilication reaction mechanism through a first connecting pipe, the top outlet end of the desilication reaction mechanism is communicated with the top inlet end of a membrane desalination reactor through a second connecting pipe, a collecting pipe is arranged at the bottom outlet end of the membrane desalination reactor, a mixing cylinder which is communicated with the first connecting pipe is arranged at the bottom of a tank body, a chemical adding mechanism for adding a desilication agent is arranged at the outer circumference of the mixing cylinder, a plurality of active seed crystals are added inside the reaction cylinder, the produced water in the reaction cylinder, the active seed crystals and the desilication agent are mixed and the silicon slag generated by the mixing reaction are communicated with each other on the outer surface of the active seed crystals, a spiral coating groove is arranged at the inner circumference of the reaction cylinder, a plurality of active seed crystals are processed on the spiral slag abrasion grooves, and a new abrasive component for processing the surface of the silicon slag abrasion reaction components is arranged on the surface of the spiral slag abrasion groove. Further, the top of the mixing cylinder is provided with a collecting cover, the collecting cover is provided with a supporting net positioned between the mixing cylinder and the reaction cylinder, and a second annular gap for active seed crystals to enter the supporting net is formed between the bottom of the reaction cylinder and the collecting cover. Further, the medicine adding mechanism is characterized in that an annular distribution pipe is arranged on