Method for dehumidifying polymer dispersing device

Abstract

The invention discloses a method for dehumidifying a polymer dispersing device. The method comprises the following steps: pressurizing air by using an air blower, and feeding the pressurized air into a molecular sieve dryer; damp air is adsorbed and dried in the molecular sieve dryer, and the dried air is fed into the top of the closed container of the polymer dispersing device by utilizing excess pressure; a one-way vent hole is formed in the bottom of the polymer dispersing device closed container, and wet air is discharged from the one-way vent hole in the bottom of the polymer dispersing device closed container; the top of the closed container of the polymer dispersing device is provided with a quick-open type feed opening, and the dry polymer powder is poured into the storage hopper of the polymer dispersing device from the quick-open type feed opening at regular intervals; and regularly taking out the saturated molecular sieve adsorbent in the molecular sieve dryer for regeneration. The air subjected to drying treatment performs micro-positive pressure ventilation on the closed container of the polymer dispersing device, so that the humidity of the air in contact with the dry polymer powder can be ensured to be less than or equal to 40%, the dry polymer powder is prevented from deliquescing and caking, and the normal operation of the polymer dispersing device is further ensured.

Description

Technical Field

[0001] The invention relates to the technical field of chemical flooding and injection, in particular to a dehumidification method for a polymer dispersion device. Background Art

[0002] Polymer-surfactant binary flooding technology (hereinafter referred to as binary flooding) is of great significance for transforming the development mode of old oil fields, improving the recovery degree, alleviating the trend of production decline, and improving economic benefits. For this reason, CNPC included this technology in the major development test project of China Petroleum launched in 2005. Since 2008, CNPC has accelerated the pace of major development tests of binary flooding and deployed major development tests of binary flooding in 5 blocks, namely Jin 16 block of Liaohe Oilfield, 7th block of Xinjiang Oilfield, Hongganghong 113 block of Jilin Oilfield, North 3 block of Maling in Changqing Oilfield, and Gangxi 3 block of Dagang Oilfield.

[0003] The daily oil production of the industrialized test of binary flooding in Jin 16 block of Liaohe Oilfield has increased by 5 times compared with that before the conversion to flooding, reaching 350 tons. The momentum of increasing oil and reducing water has continued to improve. For the first time in China, the application of alkali-free binary flooding system in "double high oilfield" has been realized. The industrialized test project of binary flooding in Jin 16 block has become the only project that has achieved phased results among the five chemical flooding test areas of China National Petroleum Corporation. It is also another major project that has achieved phased success in Liaohe Oilfield after the major development tests of steam flooding and SAGD. If the binary flooding technology can be successfully applied in the "double high oilfield" of Liaohe Oilfield, it will enable a new round of effective development of the 300 million tons of old thin oil reserves, which is of great significance. On the basis of the good results of the industrialized test of binary flooding, Liaohe Oilfield has continued to promote the ground engineering of binary flooding. At present, the ground engineering of binary flooding in Jin 16 block of Huanxiling Oilfield (79 well groups), the ground engineering of binary flooding in Shen 67 block, and the ground engineering of binary flooding pilot test in Hai 1 block have been gradually promoted.

[0004] Description of the polymer mother liquor preparation process: Low-mineralized sewage enters the preparation station's purified water tank at low pressure for buffer storage. The sewage in the purified water tank is lifted by the water supply pump of the dispersion and dissolution device to the polymer dispersion and dissolution device to dissolve the polymer dry powder. The dispersion and dissolution device is mainly composed of a storage hopper, a feeder, a water ejector, a mixing box, a screw pump, etc. The polymer dry powder is lifted to the top of the storage hopper by a crane, and then the bag mouth is opened manually. At this time, the polymer dry powder enters the storage hopper, and is accurately measured by the feeder (the amount of powder discharged is controlled at ±2%) and enters the water ejector. The water lifted by the water supply pump of the dispersion and dissolution device forms a relatively high-pressure jet in the water ejector device, which brings the polymer dry powder into the mixing box for full mixing. The mixed polymer dispersion is lifted by the transfer pump of the dispersion and dissolution device into the maturation tank.

[0005] Since the Liaohe Oilfield is located in a reed pond wetland, the air humidity is high in summer (40-95%). After absorbing moisture in the air, the polymer dry powder becomes deliquescent and agglomerates. The polymer dry powder sticks to the storage hopper of the polymer dispersion device and the inside of the water ejector jet powder suction pipeline, making it impossible to discharge the polymer dry powder normally. At the same time, the polymer dry powder sticks to the inside of the water ejector pipeline after absorbing moisture, causing the pipeline to be blocked and making it impossible to suck in the polymer dry powder normally.

[0006] At present, the technical solution to solve the problem of polymer dispersion device not being able to operate due to high air humidity in summer is to manually clean the storage hopper and water injector pipeline of the polymer dispersion device three times a day, and manually clean out the sticky mass of polymer dry powder after absorbing moisture before operation. This technical solution cannot guarantee the operating rate of the polymer dispersion device, resulting in the chemical flooding injection system being unable to meet the injection requirements of geological development, thereby reducing the oil recovery effect of the chemical flooding block. Summary of the invention

[0007] The present invention solves the problem that high air humidity in summer has an adverse effect on a polymer dispersion device and provides a method for dehumidifying a polymer dispersion device to ensure that when the air humidity is high in summer, the polymer dry powder does not deliquesce or agglomerate, thereby meeting the normal operation of the polymer dispersion device.

[0008] In order to solve the above technical problems, the technical solution of the present invention is: a method for dehumidifying a polymer dispersion device, comprising the following steps:

[0009] A. Use a blower to pressurize the air and send it into the molecular sieve dryer;

[0010] B. The moist air is adsorbed and dried in the molecular sieve dryer, and the dried air is sent to the top of the closed container of the polymer dispersion device using the residual pressure;

[0011] C. A one-way vent is provided at the bottom of the sealed container of the polymer dispersion device, and the wet air is discharged through the one-way vent at the bottom of the sealed container of the polymer dispersion device;

[0012] D. A quick-opening discharge port is provided on the top of the closed container of the polymer dispersing device, and the polymer dry powder is regularly poured into the storage hopper of the polymer dispersing device through the quick-opening discharge port;

[0013] E. Regularly remove the saturated molecular sieve adsorbent inside the molecular sieve dryer for regeneration.

[0014] Furthermore, the ambient air humidity index is: >40%.

[0015] Furthermore, the polymer dispersion device contacts the air humidity index: ≤40%.

[0016] Furthermore, the slightly positive ventilation pressure of the sealed container of the polymer dispersion device is 200-400Pa higher than the external air pressure of the sealed container of the polymer dispersion device.

[0017] Furthermore, in step C, the one-way ventilation hole ensures that air can only flow from the inside of the sealed container of the polymer dispersion device to the outside of the sealed container of the polymer dispersion device.

[0018] Furthermore, in step E, the molecular sieve adsorbent is placed in a molecular sieve dryer to ensure the moist air drying effect.

[0019] Furthermore, the molecular sieve is a new molecular sieve.

[0020] Furthermore, the molecular sieve is a regenerated molecular sieve.

[0021] The present invention uses dried air to perform micro-positive pressure ventilation on the closed container of the polymer dispersion device, which can ensure that the air humidity contacted by the polymer dry powder is ≤40%, avoid deliquescence and agglomeration of the polymer dry powder, and thus ensure the normal operation of the polymer dispersion device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic diagram of the present invention.

[0024] Among them: 1. Blower; 2. Molecular sieve dryer; 3. Polymer dispersion device closed container; 4. Quick-opening discharge port; 5. One-way ventilation hole. DETAILED DESCRIPTION

[0025] The following will be combined with the attached Figure 1 The technical solution of the present invention is described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The present invention is described in detail below by specific examples, but the protection scope of the present invention is not limited. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can be obtained from commercial channels.

[0027] In the description of the present invention, it should be noted that the terms "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for distinction, and cannot be understood as indicating or implying relative importance.

[0028] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] A method for dehumidifying a polymer dispersion device comprises the following steps:

[0031] A. Use blower 1 to pressurize the air and send it into molecular sieve dryer 2;

[0032] B. The moist air is adsorbed and dried in the molecular sieve dryer 2, and the dried air is sent to the top of the closed container 3 of the polymer dispersion device by utilizing the residual pressure;

[0033] C. A one-way vent hole 5 is provided at the bottom of the polymer dispersion device sealed container 3, and the one-way vent hole 5 ensures that air can only flow from the inside of the polymer dispersion device sealed container 3 to the outside of the polymer dispersion device sealed container 3, and wet air is discharged from the one-way vent hole 5 at the bottom of the polymer dispersion device sealed container 3;

[0034] D. A quick-opening discharge port 4 is provided on the top of the closed container 3 of the polymer dispersing device, and the polymer dry powder is regularly poured into the storage hopper of the polymer dispersing device through the quick-opening discharge port 4;

[0035] E. Regularly take out the saturated molecular sieve adsorbent inside the molecular sieve dryer 2 for regeneration, and load new molecular sieve or regenerated molecular sieve adsorbent into the molecular sieve dryer 2 to ensure the humid air drying effect.

[0036] Ambient air humidity index: >40%.

[0037] The humidity index of the air contacted by the polymer dispersion device is ≤40%.

[0038] The slightly positive ventilation pressure of the sealed container 3 of the polymer dispersion device is 200-400Pa higher than the external air pressure of the sealed container 3 of the polymer dispersion device.

[0039] Since the polymer dry powder absorbs moisture in the air and then deliquesces and agglomerates, it has a bad effect on the polymer dispersion device. The air in contact with the polymer dry powder needs to be dehumidified to ensure that the dry powder always maintains the characteristics of easy flow and non-adhesion. Therefore, the polymer dispersion device can be sealed with a container, and at the same time, micro-positive pressure ventilation is adopted, and the molecular sieve is used to effectively absorb the moisture in the air of the micro-positive pressure ventilation, and the dry air is sent into the sealed container 3 of the polymer dispersion device to ensure that the humidity of the air in contact with the polymer dry powder is ≤40%.

[0040] Technical principle

[0041] According to the principle of physical adsorption (van der Waals force):

[0042] Molecular sieves are crystalline silicates or aluminosilicates, which are composed of silicon-oxygen tetrahedrons or aluminum-oxygen tetrahedrons connected by oxygen bridge bonds to form a pore and cavity system of molecular size (usually 0.3-2nm). They have uniform micropores, and their pore size is comparable to that of water molecules.

[0043] The adsorption of substances by molecular sieves is derived from physical adsorption (van der Waals force). The crystal pores have strong polarity and Coulomb field, and show strong adsorption capacity for polar water molecules. The physical adsorption capacity is used to adsorb moisture from the humid air flowing through the molecular sieve, and most of the moisture in the air is removed. The adsorbed dry air (air humidity ≤ 40%) is sent to the closed container 3 of the polymer dispersion device to ensure that the polymer dry powder does not deliquesce and agglomerate, thereby ensuring the normal operation of the polymer dispersion device.

[0044] The above-described embodiments are only preferred embodiments of the present invention, and are not all feasible embodiments of the present invention. For those skilled in the art, any obvious changes made to it without departing from the principles and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention. Although the present invention has been described above with reference to the embodiments, various improvements can be made to it and the components thereof can be replaced by equivalents without departing from the scope of the present invention. In particular, as long as there is no technical conflict, the various features in the embodiments disclosed in the present invention can be used in combination with each other in any way, and the fact that these combinations are not exhaustively described in this specification is only for the purpose of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for dehumidifying a polymer dispersion device, characterized in that: The following steps are involved: A. Use a blower to pressurize the air and send it into the molecular sieve dryer; B. The moist air is adsorbed and dried in the molecular sieve dryer, and the dried air is sent to the top of the closed container of the polymer dispersion device using the residual pressure; C. A one-way vent is provided at the bottom of the sealed container of the polymer dispersion device, and the wet air is discharged through the one-way vent at the bottom of the sealed container of the polymer dispersion device; D. A quick-opening discharge port is provided on the top of the closed container of the polymer dispersing device, and the polymer dry powder is regularly poured into the storage hopper of the polymer dispersing device through the quick-opening discharge port; E. Regularly remove the saturated molecular sieve adsorbent inside the molecular sieve dryer for regeneration.

2. The method for dehumidifying a polymer dispersion device according to claim 1, characterized in that: Ambient air humidity index: >40%.

3. The method for dehumidifying a polymer dispersion device according to claim 1, characterized in that: The humidity index of the air contacted by the polymer dispersion device is ≤40%.

4. The method for dehumidifying a polymer dispersion device according to claim 1, characterized in that: The slightly positive ventilation pressure of the sealed container of the polymer dispersion device is 200-400 Pa higher than the external air pressure of the sealed container of the polymer dispersion device.

5. The method for dehumidifying a polymer dispersion device according to claim 1, characterized in that: In the step C, the one-way ventilation hole ensures that air can only flow from the inside of the sealed container of the polymer dispersion device to the outside of the sealed container of the polymer dispersion device.

6. The method for dehumidifying a polymer dispersion device according to claim 1, characterized in that: In the step E, the molecular sieve adsorbent is placed in a molecular sieve dryer to ensure the moist air drying effect.

7. The method for dehumidifying a polymer dispersion device according to claim 6, characterized in that: The molecular sieve is a new molecular sieve.

8. The method for dehumidifying a polymer dispersion device according to claim 6, characterized in that: The molecular sieve is a regenerated molecular sieve.

Images