CN109536146B - Plastic particle type profile control agent, preparation method and application thereof - Google Patents
Plastic particle type profile control agent, preparation method and application thereof Download PDFInfo
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- 229920003023 plastic Polymers 0.000 title claims abstract description 63
- 239000004033 plastic Substances 0.000 title claims abstract description 63
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 239000012530 fluid Substances 0.000 claims abstract description 32
- 238000002156 mixing Methods 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- 239000003431 cross linking reagent Substances 0.000 claims description 20
- 229920002401 polyacrylamide Polymers 0.000 claims description 13
- 239000000243 solution Substances 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 8
- 150000008442 polyphenolic compounds Chemical class 0.000 claims description 7
- 235000013824 polyphenols Nutrition 0.000 claims description 7
- 229920000426 Microplastic Polymers 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000001746 injection moulding Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 239000012943 hotmelt Substances 0.000 claims description 4
- 125000000129 anionic group Chemical group 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
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- 230000000052 comparative effect Effects 0.000 description 3
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- 235000003283 Pachira macrocarpa Nutrition 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
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- 239000003129 oil well Substances 0.000 description 2
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- 239000004571 lime Substances 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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Abstract
The invention provides a plastic particle type profile control agent, which comprises plastic particles and a displacement fluid; the plastic particles are arranged into hollow tubular shapes with gaps, and the gaps extend to two ends along the length direction; the displacement fluid comprises an organic gel true solution; the mass mixing ratio of the plastic particles to the organic gel true solution is 0.5-5: 100. the invention relates to a plastic particle type profile control agent, a preparation method and application thereof, which effectively overcome the defect that the product of the existing profile control technology blocks a serious fluid channeling channel.
Description
Technical Field
The invention belongs to the technical field of oil-water well profile control and water shutoff in oil exploitation, and particularly relates to a novel granular profile control agent.
Background
At present, most oil fields in China adopt a water-flooding or polymer oil-displacing mode to carry out oil exploitation, namely, water or polymer solution (for short, displacement fluid) is injected into a water injection well to displace crude oil in an oil layer to an oil production well.
Theoretically the water flooding or polymer flooding efficiency depends on the effective swept volume of the displacement fluid in the reservoir. In the actual water flooding or polymer flooding implementation process, flow-through channels of the displacement fluid can be developed to different degrees in the oil reservoir due to the influences of the heterogeneity of the oil reservoir, the sand production and the depletion of the stratum and natural cracks of the stratum. The seriously developed cross flow channel can cause the displacement fluid to directly cross from the water injection well to the corresponding beneficial oil well, the swept volume cannot be effectively enlarged, and the oil displacement efficiency is rapidly reduced. For this reason, it is necessary to block the flow channel in the oil reservoir.
The oil-water well profile control and water shutoff technology is just to inject profile control agent (also called plugging agent) into the stratum from the oil-water well to block a channeling channel in the layer, enlarge the effective swept volume of the displacement fluid in the oil layer and improve the oil displacement efficiency.
The profile control agent for plugging the serious fluid channeling channel has the characteristics of good injectability and high deep plugging strength. The main profile control technical products at present and the technical characteristics thereof are as follows:
(1) the organogel blocking agent has good injectability and water blocking strength for adjusting and blocking a common channeling channel. The plugging agent consists of a polymer solution and a cross-linking agent, is a true solution when being injected, and can form jelly-shaped gel after being cross-linked in the later period. However, when the plugging is adjusted aiming at a serious channeling channel, the influence of dilution of formation water is obvious, the actual plugging strength is far lower than the expected plugging strength of the ground configuration concentration, and even the profile control agent can not be gelatinized.
(2) And non-consolidated solid particles, wherein the solid particles are injected into the stratum along with the working fluid, and the particles or the particle accumulation blocks the channeling passage. The solid particles can be rubber particles with stable physical properties, expanded particles capable of expanding when meeting water, fly ash and lime powder. The most applied on site is that the bulked particles are matched with organogel plugging agents for use, and the plugging agent is used for plugging a large channeling channel. However, these plugging agents form loose packs which are easily flung away. In the plugging control construction of a severe channeling flow channel, the volume swelling particles with the diameter of more than 1cm are reported to be directly produced by an oil well.
(3) The cement plugging agent can be solidified after being injected into the stratum, and has the characteristic of high-strength permanent sealing. Because the specific gravity of cement is much larger than that of water, in order to ensure the injectability, the plugging agent is a superfine cement paste system which is usually composed of micron-level or even nano-level superfine cement and a displacement fluid for improving the suspension performance. On one hand, when the plugging agent is used for deep plugging of a serious water channeling channel, the suspension property of a cement paste system is influenced by dilution of formation water, the plugging agent is easy to accumulate in a near well and is difficult to transport in a deep part; on the other hand, there is a construction risk of permanent "plugging" of the medium and low permeability oil-bearing reservoir in the near wellbore zone.
Aiming at the problems, the invention develops the granular profile control agent for plugging the serious channeling channel, thereby realizing the high-strength plugging of the deep part of the channeling channel and effectively overcoming the defect that the product of the existing profile control technology is used for plugging the serious channeling channel.
Disclosure of Invention
In view of the above, the invention aims to provide a plastic particle type profile control agent, a preparation method and an application thereof, so as to effectively overcome the defect that the product of the existing profile control technology blocks a serious cross flow channel.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a plastic particle type profile control agent comprises plastic particles and carrier fluid; the plastic particles are arranged into hollow tubular shapes with gaps, and the gaps extend to two ends along the length direction; the carrying fluid comprises an organic gel true solution;
the mass mixing ratio of the plastic particles to the organic gel true solution is 0.5-5: 100.
preferably, the length of the plastic particles is 0.5-5 mm; the thickness of the pipe wall of the plastic particles is 0.1-0.3 mm; the plastic granules have a cross-sectional circumference of 5-8 mm.
Preferably, the plastic particles comprise one or more of type a particles, type G particles and type C particles; preferably, the A-type particles are arranged into a hollow tube with notches, the cross section of the A-type particles is arranged into an equilateral triangle, and the width of each notch is 1/4-1/2 of the side length; preferably, the G-type particles are arranged into a hollow tube with a notch, the cross section of the G-type particles is rectangular, the notch is arranged on the long side, and the width of the notch is 1/4-1/2 of the length of the long side; preferably, the C-shaped particles are provided in the shape of a hollow tube with a notch, the cross section of the C-shaped particles is provided with a circle, and the central angle of the notch is 60-120 °.
Preferably, the plastic particle raw material comprises one or more than two of ABS, PC, PP and PEC plastics, the softening point is more than 90 ℃, and the density is 0.95-1.05 mg/cm3。
A preparation method of a plastic particle type profile control agent comprises the following steps:
selecting a plastic particle raw material, and carrying out hot melting on the plastic particles, wherein the hot melting heating temperature is 100-140 ℃, and keeping the temperature for 2-4 hours to form a completely molten hot melt;
pouring the hot melt into a plastic shaping mold for shaping to prepare an injection molding product;
thirdly, starting the extruder to extrude the injection molding product into a required shape, and cutting the extruded injection molding product by using a cutting machine to prepare a plastic particle finished product;
step four: and adding the plastic particles and the carrying fluid according to a required mixing ratio, and uniformly mixing to obtain the plastic particle type profile control agent.
An application of a plastic particle type profile control agent for oil exploitation for plugging a severe channeling channel.
Water plugging principle of the invention
The specific gravity of the granular profile control agent material is close to that of water, and the granular profile control agent material can be mixed with a displacement fluid, can suspend or float in the displacement fluid, and avoids accumulation at a part close to a well due to sedimentation.
The particulate profile control agent is carried with the displacement fluid to the channeling passage. As the pore canal extending from the channeling passage becomes smaller and the flow rate of the leading-edge displacement fluid is slowed down, the particle profile control agent in the subsequent displacement fluid and the particle profile control agent in the leading-edge displacement fluid start to accumulate. Because the plastic particles in the granular profile control agent have water chestnuts and notches and the elastic deformation of plastic materials, firm riveting bridge accumulation shown in figure 1 is formed in the flow channel by the plastic particles, and the permeability of the flow channel is rapidly reduced, so that the serious flow channeling of the displacement fluid is blocked, the effective wave and volume of the displacement fluid in an oil layer are enlarged, and the oil displacement efficiency is improved.
Compared with the prior art, the plastic particle type profile control agent, the preparation method and the application thereof have the following advantages:
(1) the product of the invention is a particle type profile control agent with adjustable particle size, and the raw materials can use waste plastics, so the raw materials are wide, and the production process is simple and safe.
(2) The product has the specific gravity close to that of water, is not easy to settle in a shaft string or a near-well stratum, is injected into the stratum with the displacement fluid on site, and has simple and safe construction process.
(3) The plastic particles of the product provided by the invention are provided with water chestnuts and notches, and the plastic material is elastically deformed, so that firm riveting and bridging accumulation can be formed in a serious cross flow channel, and compared with the common particle profile control agent, the profile control agent is loose in accumulation and easy to disperse, the product provided by the invention can rapidly reduce the permeability of the cross flow channel and inhibit cross flow.
(4) According to the product disclosed by the invention, plastic particles and carrying fluid are mixed for use, and a firm accumulation which is riveted and bridged is filled in a formed jelly-shaped gel body, so that the plugging capability of a serious fluid channeling channel can be obviously enhanced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a granular profile control agent riveted bridge according to an embodiment of the invention;
FIG. 2 is a schematic perspective view of a profile control agent in the form of granules according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a profile control agent in the form of granules according to an embodiment of the present invention;
fig. 4 is a schematic view of a plugging simulation pipe for a water channeling channel according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The organic gel true solution comprises polyacrylamide, a cross-linking agent and water, wherein the concentration of the polyacrylamide and the cross-linking agent is the same and is 3 g/ml. The polyacrylamide is anionic polyacrylamide with the molecular weight of 2500 ten thousand; the cross-linking agent is an oligomeric polyphenol cross-linking agent.
Example 1
(1) Test sample preparation 1kg of ABS waste plastic raw material was weighed. The used waste plastic raw materials are added into a plastic hot melting cavity of a screw plastic extruder, the heating temperature of the hot melting cavity is set to be 130 ℃, the constant temperature is kept for 2.5 hours, and the waste plastics are ensured to be completely melted and plastic. Adjusting the wall thickness of the plastic pipe to be 0.2mm, adjusting the grain cutting length of the hob and controlling the cutting length of the extrudate at the outlet to be 1.0 mm. Preparing type A plastic particles.
(2) Preparing a profile control agent: preparing a carrying fluid: adding 3.0g of partially hydrolyzed polyacrylamide (with the molecular weight of 2500 ten thousand) and 3.0g of cross-linking agent (oligomeric polyphenol cross-linking agent) into 1000ml of tap water, and uniformly mixing; after stirring for 1h, 20g of A-type plastic particles are added, and stirring is continued for 30min to obtain the profile control agent for implementation.
(3) Simulation experiment for plugging of serious water channeling channel:
and preparing a simulation pipe for plugging a serious water channeling channel. Selecting a cylindrical steel pipe with the inner diameter of 1cm multiplied by the length of 100cm, and the pressure resistance is more than or equal to 5.0MPa, and shaping the steel pipe into a plurality of bends, wherein the angle of each 10cm is 90 degrees, as shown in figure 4.
Injecting the profile control agent into a horizontally placed simulation tube of the serious water channeling channel at the injection speed of 20ml/min by using a peristaltic pump, sealing two ends of the simulation tube after the injection amount is 3 times of the pore volume, curing for 30 days at 60 ℃, and testing the breakthrough pressure of the profile control agent injected into the simulation tube of the serious water channeling channel by using a advection pump to be 1.16 MPa.
Example 2
(1) Preparation of test sample 1kg of G-type plastic granules were granulated by replacing the G-type plastic shaping mold according to the preparation method of example 1.
(2) Preparing a profile control agent: preparing a carrying fluid: adding 3.0G of partially hydrolyzed polyacrylamide (with the molecular weight of 2500 ten thousand) and 3.0G of cross-linking agent (oligomeric polyphenol cross-linking agent) into 1000ml of tap water, uniformly mixing, adding 20G of G-type plastic particles after stirring for 1 hour, and continuously stirring for 30min to obtain the profile control agent for implementation.
(3) Simulation experiment for plugging of serious water channeling channel:
the same severe water channeling plugging simulated tube as in example 1 was prepared. Injecting the profile control agent into a horizontally placed simulation tube of the serious water channeling channel at the injection speed of 20ml/min by using a peristaltic pump, sealing two ends of the simulation tube after the injection amount is 3 times of the pore volume, curing for 30 days at 60 ℃, and testing the breakthrough pressure of the profile control agent injected into the simulation tube of the serious water channeling channel by using a advection pump to be 1.04 MPa.
Example 3
(1) Preparation of test sample 1kg of C-shaped plastic granules were granulated by replacing the C-shaped plastic molding die according to the preparation method of example 1.
(2) Preparing a profile control agent: preparing a carrying fluid: adding 3.0g of partially hydrolyzed polyacrylamide (with the molecular weight of 2500 ten thousand) and 3.0g of cross-linking agent (oligomeric polyphenol cross-linking agent) into 1000ml of tap water, uniformly mixing, adding 20g of C-type plastic particles after stirring for 1 hour, and continuously stirring for 30min to obtain the profile control agent for implementation.
(3) Simulation experiment for plugging of serious water channeling channel:
the same severe water channeling plugging simulated tube as in example 1 was prepared. Injecting the profile control agent into a horizontally placed severe water channeling channel simulation tube at the injection speed of 20ml/min by using a peristaltic pump, sealing two ends of the simulation tube after the injection amount is 3 times of the pore volume, maintaining for 30 days at 60 ℃, and testing the breakthrough pressure of the profile control agent injected into the severe water channeling channel simulation tube by using a constant flow pump to be 0.95 MPa.
Comparative example
(1) Preparing a profile control agent: preparing a carrying fluid: adding 3.0g of partially hydrolyzed polyacrylamide (with the molecular weight of 2500 ten thousand) and 3.0g of cross-linking agent (oligomeric polyphenol cross-linking agent) into 1000ml of tap water, uniformly mixing, adding 20g of volume swelling particles after stirring for 1 hour, and continuously stirring for 30min to obtain the profile control agent for implementation.
(2) Simulation experiment for plugging of serious water channeling channel:
the same severe water channeling plugging simulated tube as in example 1 was prepared. Injecting the profile control agent into a horizontally placed simulation tube of the serious water channeling channel at the injection speed of 20ml/min by using a peristaltic pump, sealing two ends of the simulation tube after the injection amount is 3 times of the pore volume, curing for 30 days at 60 ℃, and testing the breakthrough pressure of the profile control agent injected into the simulation tube of the serious water channeling channel by using a advection pump, wherein the breakthrough pressure is 0.35 MPa.
Note: in the above examples and comparative examples, the polymer is anionic polyacrylamide, the model is BHHP-113, the product standard Q/12DGY 3865-; the cross-linking agent is a main agent of the oligomeric polyphenol cross-linking agent, the model is I, the product standard is Q/12DGY3805-2014, and the cross-linking agent is produced by Dagang oilfield shore corporation. The volume expansion particle profile control agent for oil recovery used in the comparative example has the particle size of 1mm and the model BHT-602, is produced by Hongkong oilfield Bingkon company and has the product standard Q/12DGY 3573-.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the spirit and principles of the present invention, but rather as the description of the preferred embodiments of the present invention.
Claims (6)
1. A plastic particle type profile control agent is characterized in that: comprises plastic particles and carrying fluid; the plastic particles are arranged into hollow tubular shapes with gaps, and the gaps extend to two ends along the length direction; the carrying fluid comprises an organic gel true solution; the organic gel true solution comprises polyacrylamide, a cross-linking agent and water, wherein the concentration of the polyacrylamide and the cross-linking agent is the same and is 3 g/ml; the polyacrylamide is anionic polyacrylamide with the molecular weight of 2500 ten thousand; the cross-linking agent is an oligomeric polyphenol cross-linking agent;
the mass mixing ratio of the plastic particles to the organic gel true solution is 0.5-5: 100.
2. a plastic particle type profile control agent according to claim 1, characterized in that: the length of the plastic particles is 0.5-5 mm; the thickness of the pipe wall of the plastic particles is 0.1-0.3 mm; the plastic granules have a cross-sectional circumference of 5-8 mm.
3. A plastic particle type profile control agent according to claim 2, characterized in that: the plastic particles comprise one or more than two of A-type particles, G-type particles and C-type particles; the A-type particles are arranged into hollow tubes with notches, the cross sections of the A-type particles are arranged into equilateral triangles, and the width of each notch is 1/4-1/2 of side length; the G-type particles are arranged into hollow tubes with gaps, the cross sections of the G-type particles are rectangular, the gaps are arranged on the long sides, and the width of each gap is 1/4-1/2 of the length of each long side; the C-shaped particles are arranged into hollow tubes with gaps, the cross sections of the C-shaped particles are circular, and the central angles of the gaps are 60-120 degrees.
4. A plastic particle type profile control agent according to claim 1, characterized in that: the plastic particle raw material comprises one or more than two of ABS, PC, PP and PEC plastics, the softening point is more than 90 ℃, and the density is 0.95-1.05 mg/cm 3.
5. A method for preparing a profile control agent in the form of plastic granules according to any one of claims 1 to 4, characterized in that: the method comprises the following steps: selecting a plastic particle raw material, and carrying out hot melting on the plastic particles, wherein the hot melting heating temperature is 100-140 ℃, and keeping the temperature for 2-4 hours to form a completely molten hot melt; pouring the hot melt into a plastic shaping mold for shaping to prepare an injection molding product; thirdly, starting the extruder to extrude the injection molding product into a required shape, and cutting the extruded injection molding product by using a cutting machine to prepare a plastic particle finished product; step four: and adding the plastic particles and the carrying fluid according to a required mixing ratio, and uniformly mixing to obtain the plastic particle type profile control agent.
6. Use of a profile control agent in the form of plastic granules according to any one of claims 1 to 4, characterized in that: the method is used for oil exploitation for plugging a serious cross flow channel.
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| CN110805408B (en) * | 2019-05-31 | 2021-08-31 | 大港油田集团有限责任公司 | Profile control process method for water injection well with packer pipe column |
| CN114075941B (en) * | 2020-08-17 | 2023-06-30 | 中国石油天然气股份有限公司 | Method for prolonging validity period of deep profile control of thin oil water injection well |
| CN114517083B (en) * | 2020-11-20 | 2023-08-22 | 中国石油天然气股份有限公司 | Profile control system of rice hull powder composite gel and manufacturing method thereof |
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