CN109551626B - Sand washing temporary plugging agent particles and sand washing temporary plugging liquid prepared from waste ultralight clay and preparation - Google Patents
Sand washing temporary plugging agent particles and sand washing temporary plugging liquid prepared from waste ultralight clay and preparation Download PDFInfo
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- CN109551626B CN109551626B CN201811202170.2A CN201811202170A CN109551626B CN 109551626 B CN109551626 B CN 109551626B CN 201811202170 A CN201811202170 A CN 201811202170A CN 109551626 B CN109551626 B CN 109551626B
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- temporary plugging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C3/00—Apparatus or methods for mixing clay with other substances
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
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Abstract
The invention provides sand washing temporary plugging agent particles and sand washing temporary plugging liquid prepared from waste ultralight clay and preparation. The sand washing temporary plugging agent particle comprises a waste ultralight clay block and a polyurethane waterproof coating layer wrapped on the surface of the block. The sand washing temporary plugging liquid comprises the following components in parts by weight: 3 to 5 percent of sand washing temporary plugging agent particles, 2 to 3 percent of thickening agent and the balance of water; the sand washing temporary plugging agent particles are waste ultralight clay blocks coated with polyurethane waterproof coating layers on the surfaces. The sand washing temporary plugging liquid realizes sand washing and temporary plugging in the sand washing process of the thermal production well; the method has the advantages of wide raw material source, full utilization of waste ultralight clay, simple construction process of the sand washing temporary plugging agent, simple and convenient operation and the like.
Description
Technical Field
The invention belongs to the field of oil field application. More particularly, the invention relates to sand washing temporary plugging agent particles and sand washing temporary plugging liquid prepared from waste ultralight clay and preparation thereof.
Background
The ultralight clay is a non-toxic, non-irritant, novel, environment-friendly and public-benefit material, belongs to the clay class, and is mainly prepared by foaming high polymer material foaming powder (vacuum microspheres, which can be PP or PET foaming powder) and then physically mixing the foaming powder with materials such as polyvinyl alcohol, a cross-linking agent, glycerol, pigments and the like according to a certain proportion. The ultra-light clay was originally produced in germany and gradually spread throughout europe, and then transferred to mainland china through japan, korea, and taiwan. The material has strong vegetality and bright color, and can be kneaded and created by handwork. The novel clay sculpture is a latest manual creation material integrating the advantages of clay, paper clay, sculpture oil sludge, plasticine and the like, can be perfectly combined with materials such as wood, metal sheets, paillettes, glass and the like, does not need baking, can be naturally dried in air within 24-48 hours, has the characteristics of elasticity and no fragmentation, and is low in price and popular with various people. According to preliminary statistics, the monthly sales of the ultralight clay merchants with the best sales on a certain E-commerce platform reach 163454 boxes. However, most of the ultra-light clay used in the application process, especially for children, is mainly selected to be discarded after plastic drying and hardening.
At present, the key technology and patent method research of ultralight clay mainly focuses on the aspects of development, use of a plastic method, storage and softening. For example, CN 201510877266.9 discloses a method for preparing a modified glutinous rice based ultra-light clay, which uses polymer foaming powder, polyvinyl alcohol, cross-linking agent, glycerin, pigment, etc. to prepare ultra-light clay, adds filler to improve the performance of ultra-light clay, and uses water to soften the ultra-light clay after plasticity, but in the above studies, how to treat the discarded ultra-light clay is not involved.
In the prior art, the ultralight clay is not disclosed to be used for sand washing temporary plugging, profile control water plugging and the like of a thermal production well.
The invention is especially proposed for better utilizing the waste ultralight clay.
Disclosure of Invention
Based on the background technology, the invention provides sand washing temporary plugging agent particles, sand washing temporary plugging liquid and preparation prepared from waste ultralight clay, the waste ultralight clay is fully utilized to prepare the sand washing temporary plugging agent with excellent performance, and sand washing and temporary plugging in the sand washing process of a thermal production well are realized; the method has the advantages of wide raw material source, full utilization of waste ultralight clay, simple construction process of the sand washing temporary plugging agent, simple and convenient operation and the like.
The ultralight clay related to the invention is the ultralight clay for children which is sold in the market, and the waste ultralight clay is understood as the ultralight clay which is normally used, discarded after plasticity, dried after being used or discarded for any reason.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides sand washing temporary plugging agent particles prepared from waste ultralight clay, which comprise waste ultralight clay blocks and polyurethane waterproof coating layers wrapped on the surfaces of the blocks.
Preferably, the size of the waste ultra-light clay lumps is (1-2) cm (0.5-1.2) cm (0.5-0.8) cm. More preferably, the size of the waste ultralight clay cake is 2cm by 1cm by 0.5 cm.
Preferably, the thickness of the polyurethane waterproof coating layer is 0.5-2.5 mm. The polyurethane waterproof coating has waterproof performance, and preferably selects the single-component polyurethane waterproof coating, wherein the tensile strength is 6MPa, and the elongation at break is 450%. The thickness of the polyurethane waterproof coating layer is preferably 1.5 mm.
The sand washing temporary plugging agent particle keeps the elasticity of an ultralight clay block and has the waterproof performance. When the temporary plugging agent is actually applied, the sand washing temporary plugging agent particles are required to be prepared into liquid for use, so that the temporary plugging effect in the sand washing and sand washing processes of the thermal production well is achieved.
The second aspect of the present invention provides a method for preparing the sand-washing temporary plugging agent particles, which comprises: crushing waste ultralight clay into blocks; and (3) uniformly spraying the polyurethane waterproof coating on the surface of the crushed blocky ultralight clay, and fully drying the blocky ultralight clay to form a film to obtain the sand washing temporary plugging agent particles. The crushed waste ultralight clay is wrapped by polyurethane waterproof paint, so that the elasticity of ultralight clay blocks is still maintained, and the waterproof performance is achieved.
The third aspect of the invention provides sand washing temporary plugging liquid prepared from waste ultralight clay, which comprises the following components in parts by weight:
3 to 5 percent of sand washing temporary plugging agent particles, 2 to 3 percent of thickening agent and the balance of water; the sand washing temporary plugging agent particles are waste ultralight clay blocks coated with polyurethane waterproof coating layers on the surfaces.
Preferably, the size of the waste ultra-light clay lumps is (1-2) cm (0.5-1.2) cm (0.5-0.8) cm. More preferably, the size of the waste ultralight clay cake is 2cm by 1cm by 0.5 cm.
Preferably, the thickness of the polyurethane waterproof coating layer is 0.5-2.5 mm. The polyurethane waterproof coating has waterproof performance, and preferably selects the single-component polyurethane waterproof coating, wherein the tensile strength is 6MPa, and the elongation at break is 450%. The thickness of the polyurethane waterproof coating layer is preferably 1.5 mm.
Preferably, the thickener is polyacrylamide, organobentonite or silicone gel. The organic bentonite has wide sources and low price, and simultaneously has certain advantages in the aspects of flowback and post-stage combined station treatment compared with polyacrylamide, and the polyacrylamide-containing flowback liquid can increase the difficulty of next-step water treatment. More preferably, the thickener is an organobentonite.
The fourth aspect of the present invention provides a method for preparing the sand-washing temporary plugging fluid, comprising:
s1, crushing the waste ultralight clay into blocks (with elasticity). Preferably, the size of the cake is around 2cm x 1 cm.
S2, uniformly spraying the polyurethane waterproof coating on the surfaces of the blocks, and fully drying the blocks in the sun to form a film so as to obtain sand washing temporary plugging agent particles; preferably, the thickness of the sprayed polyurethane waterproof coating layer is 0.5-1.5 mm. More preferably 1.5 mm.
And S3, adding sand washing temporary plugging agent particles, a thickening agent and water according to the proportion, and uniformly stirring to obtain the sand washing temporary plugging liquid.
The temporary sand-washing plugging fluid for the thermal production well is prepared from the waste ultralight clay, and the crushed waste ultralight clay is wrapped by the polyurethane waterproof coating, so that the elasticity of ultralight clay blocks is still maintained, and the temporary sand-washing plugging fluid has the waterproof performance. The treated waste ultralight clay has light texture (the density of the ultralight clay is 0.25-0.28 g/cm)3The preferred density of the one-component polyurethane waterproof coating is 1.15-1.25g/cm3) Requiring the use of thickening agentsThe agent is carried. The thickening agent can be selected from one of polyacrylamide, organic bentonite, silica gel, etc., wherein the organic bentonite is preferably used as a thickening carrier. The sand washing temporary plugging agent particles are prepared into sand washing temporary plugging liquid, the sand washing temporary plugging liquid enters an oil layer due to stratum leakage, blocky waste ultralight clay wrapping a single-component polyurethane waterproof coating layer cannot be hydrated in a shaft and during temporary plugging, and the pore throat of a leakage layer is plugged by means of elastic deformation of the ultralight clay. Meanwhile, the organic bentonite in the sand washing temporary plugging liquid has a tackifying effect, so that the organic bentonite can better disperse blocky waste ultralight clay of the single-component polyurethane waterproof coating, and can carry silt. When steam is injected in the thermal recovery well, steam is at high temperature (about 280 ℃ generally at the position of an oil layer under the well), the single-component polyurethane waterproof coating wrapping the blocky waste ultralight clay starts to decompose (the polyurethane waterproof coating film loses strength at 80-90 ℃ and decomposes at 220 ℃), the inner blocky waste ultralight clay blocky objects are exposed, the ultralight clay blocky objects accelerate hydration reaction under the action of high temperature, steam and water, and finally, the ultralight clay blocky objects are hydrated into small molecules to lose the blocking function. (2cm 1cm 0.5cm ultra-light clay particles soaked in water at room temperature, hydrolysis phenomenon appears after 20 minutes, white substances are separated out, and small molecular substances are formed after hydrolysis within 48 hours.)
The sand washing temporary plugging agent particles and the sand washing temporary plugging liquid have the following beneficial effects: (1) the raw material source is wide; and (2) the waste ultralight clay is fully utilized, and the problem of treatment of the waste ultralight clay is solved. (3) The obtained sand washing temporary plugging agent particles and sand washing temporary plugging liquid have simple construction process and simple and convenient operation.
Drawings
Fig. 1 is a schematic view of sand-washing temporary plugging agent particles in an embodiment of the present invention.
Fig. 2 is a side view of fig. 1.
Description of reference numerals: 1-waste ultralight clay block and 2-polyurethane waterproof coating layer.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
Preparing sand washing temporary plugging agent particles and sand washing temporary plugging liquid, and practically applying the particles:
s1, recycling the waste ultralight clay, and crushing the ultralight clay into blocks of about 2cm x 1cm x 0.5cm by using a crusher.
S2, uniformly spraying the polyurethane waterproof coating to the surface of the crushed blocky ultralight clay, wherein the thickness of the sprayed polyurethane waterproof coating is 0.5-2.5 mm; and (3) fully drying in the sun to form a film, thus obtaining sand washing temporary plugging agent particles, wherein the sand washing temporary plugging agent particles comprise waste ultralight clay blocks 1 and polyurethane waterproof coating layers 2 wrapped on the surfaces of the blocks as shown in figures 1 and 2.
S3, mixing organic bentonite 2-3 wt% of the temporary sand-washing plugging liquid, and temporary sand-washing plugging agent particles 3-5 wt% of the temporary sand-washing plugging liquid with water, and stirring uniformly to obtain the temporary sand-washing plugging liquid.
S4, repeatedly washing sand to obtain an expected effect due to stratum loss in a certain thermal production well of the Albizzia oil field, and applying the temporary sand washing plugging fluid. And (3) squeezing 45 square parts (3 vehicles) on site, when the 2 nd vehicle is squeezed, the pressure is increased to 2MPa, the well head is exposed to the return liquid, and when the 3 rd vehicle is squeezed, the pressure is increased to 5MPa, and 2 square parts of sand and oil sludge are flushed out.
S5, completing well completion and steam injection of the thermal recovery pipe column after sand washing, wherein in the early stage of steam injection, the injection pressure is improved by 2MPa compared with the upper period steam injection pressure, and in the middle stage of steam injection, the injection pressure is reduced and recovered to the upper period steam injection pressure.
Therefore, the sand washing temporary plugging liquid can effectively realize sand washing and temporary plugging of the thermal production well.
The waste ultralight clay used therein should be ultralight clay that is normally used, discarded after plasticity, dried after being unused or discarded for any reason. The technical scheme of the invention realizes the recycling of the ultralight clay and solves the problem of processing the ultralight clay. And the sand washing temporary plugging liquid prepared by using the waste ultralight clay can effectively realize sand washing and temporary plugging of the thermal production well.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (2)
1. The sand washing temporary plugging liquid prepared from the waste ultralight clay is characterized by comprising the following components in parts by weight:
3 to 5 percent of sand washing temporary plugging agent particles, 2 to 3 percent of thickening agent and the balance of water;
the sand washing temporary plugging agent particles consist of waste ultralight clay blocks and polyurethane waterproof coating layers wrapped on the surfaces of the blocks, and are prepared by the following method: crushing waste ultralight clay into blocks; uniformly spraying polyurethane waterproof paint on the surface of crushed blocky ultralight clay, and fully drying in the sun to form a film to obtain sand washing temporary plugging agent particles;
the ultralight clay is the ultralight clay for children sold in the market at present, the waste ultralight clay is the ultralight clay which is discarded after normal use, plasticity and overdue and dry or discarded due to any other reason, and the density is 0.25-0.28g/cm3；
The size of the waste ultralight clay blocks is 2cm x 1cm x 0.5 cm;
the thickness of the polyurethane waterproof coating layer is 1.5 mm;
the polyurethane waterproof coating layer has the density of 1.15-1.25g/cm3The single-component polyurethane waterproof coating has the tensile strength of 6MPa and the elongation at break of 450 percent;
the thickening agent is organic bentonite.
2. A method for preparing the sand-washing temporary plugging fluid as claimed in claim 1, which comprises the following steps:
crushing waste ultralight clay into blocks;
uniformly spraying the polyurethane waterproof coating on the surface of the crushed blocky ultralight clay, and fully drying the blocky ultralight clay to form a film to obtain sand washing temporary plugging agent particles;
adding sand washing temporary plugging agent particles, a thickening agent and water according to a ratio, and uniformly stirring to obtain the sand washing temporary plugging liquid.
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| CN201811202170.2A CN109551626B (en) | 2018-10-16 | 2018-10-16 | Sand washing temporary plugging agent particles and sand washing temporary plugging liquid prepared from waste ultralight clay and preparation |
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| CN201811202170.2A CN109551626B (en) | 2018-10-16 | 2018-10-16 | Sand washing temporary plugging agent particles and sand washing temporary plugging liquid prepared from waste ultralight clay and preparation |
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| CN116247442B (en) * | 2023-02-06 | 2024-02-23 | 广东福顺天际通信有限公司 | Electromagnetic wave lens and production method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1267701A (en) * | 2000-03-21 | 2000-09-27 | 石油大学(华东) | Temporary choking agent prepared with waste polyolefine |
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| US3726340A (en) * | 1971-09-03 | 1973-04-10 | W Fraser | Apparatus for overcoming lost circulation in oil wells |
| CN102653673B (en) * | 2012-01-05 | 2014-05-14 | 中国石油天然气股份有限公司 | Biodegradable temporary plugging additive |
| CN103275683B (en) * | 2013-05-14 | 2016-06-08 | 中国石油天然气股份有限公司 | Oil well sand washing temporary plugging agent prepared by waste and old diaper and its preparation method and application |
| EP3000860A1 (en) * | 2014-09-26 | 2016-03-30 | Rhodia Operations | Use of encapsulated polyamines for limiting fluid loss |
| CN108395883B (en) * | 2017-02-08 | 2020-09-29 | 中国石油化工股份有限公司 | Honeycomb-shaped gap temporary plugging agent and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1267701A (en) * | 2000-03-21 | 2000-09-27 | 石油大学(华东) | Temporary choking agent prepared with waste polyolefine |
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