CN1304830C - Process for making quartz sand epoxy resin cementitious non-homogeneous model - Google Patents

Abstract

The present invention relates to a manufacturing method of a heterogeneous model glued with quartz sand and epoxy resin, which mainly solves the problem in simulating the heterogeneity of strata by a heterogeneous model manufactured from a multilayer rock core. The manufacture of the model mainly comprises the following procedures: (1) assembling a mold, (2) proportioning, (3) mixing sand, (4) loading the sand, (5) processing by pressing, (6) solidifying by heating and (7) sealing. The pore structure characteristics, the surface properties and the heterogeneity of an actual oil reservoir can be reflected relatively truly by the heterogeneous model glued with the quartz sand and the epoxy resin, and the present invention can be used for the parameter optimization of the development of a water drive or a chemical drive, and the performance evaluation of chemical additives.

Description

Method for making heterogeneous model cemented by quartz sand and epoxy resin

Technical field:

The invention relates to a heterogeneous model used for evaluating the performance of oilfield chemical additives and its injection parameters, and belongs to a method for making a quartz sand epoxy resin cemented heterogeneous model.

Background technique:

In the process of waterflooding development of heterogeneous reservoirs, due to the small flow resistance and large water absorption of high permeability layers, the degree of crude oil recovery is high. On the contrary, the medium and low permeability layer has low recovery degree due to its high flow resistance and low water absorption. For a long time, how to reduce the high-permeability water absorption and increase the medium-low permeation water absorption, that is, adjust the liquid absorption profile (referred to as profile control), has been one of the technical problems that plague oilfield development. At present, the main technical measure for profile control in heterogeneous reservoirs is to plug high-permeability layers. There are often many chemical additives with certain profile control functions on the market, which requires evaluation of their performance and product optimization. The quartz sand epoxy resin cemented heterogeneity model can more realistically simulate reservoir heterogeneity, and can replace the actual reservoir to evaluate the performance of chemical additives.

Invention content:

The invention provides a method for making a quartz sand epoxy resin cemented heterogeneous model. The quartz sand epoxy resin cemented model can more truly reflect the pore structure characteristics, surface properties and heterogeneity of the actual reservoir, and can be used for water flooding Or optimization of chemical flooding development parameters and performance evaluation of chemical additives.

The technical solution adopted in the present invention is: the quartz sand epoxy resin cemented heterogeneous model manufacturing method comprises the following steps: (1) mould: the mold is made up of side plates, end plates, base plates and pressure plates; (2) ingredients: The materials for model making are mainly composed of 85%-95% of quartz sand and 5%-15% of cement. The materials are proportioned by weight. The model usually includes 3 permeable layers; The quartz sand and cement required for each layer are weighed, mixed, stirred, sieved, and set aside; (4) Sand loading: according to the upper and lower relationship designed for each permeable layer of the model, the corresponding sand containing cement is loaded in sequence (5) Pressure forming: place the mold on a pressure testing machine, adjust the position of the mold so that it remains on the center line of the pressure plate of the press, and then slowly rise to 14 to 83 standard atmospheres, Stabilize the pressure for 15 minutes, release the pressure; (6) Heating and curing: put the pressed model into the oven, and cure it at a constant temperature of 85°C for 6-8 hours, turn off the power of the oven, and cool naturally to room temperature; (7) Sealing treatment: ① Cutting Use a cutting machine to cut the plate-shaped model into the size required for the experiment; ② End cover bonding Process a 1cm thick Bakelite board into an end cover with the same size as the end face of the model. A hole is drilled in the middle of the end cover, and one side is processed. For a groove smaller than the outer edge of the end cover, apply uncured epoxy resin on the outer edge of the end cover with the groove, and let it connect with the end face of the model; Epoxy resin to form a thin layer with a thickness of about 1mm; ④ Casting Put the model with end caps and surface treatment into a wooden mold, seal both ends with plasticine, and then pour epoxy resin into the mold, The model was obtained by placing it at room temperature for 24 hours. ⑤Pressure test Take out the cured model from the wooden mold, and test it with 0.8MPa gas to ensure no leakage; Ensure that the deviation between the measured value and the design value is less than 10%.

The above-mentioned cement is composed of epoxy resin and three kinds of additives. The ratio of epoxy resin and additives is by weight: 0.5-1.5 parts of epoxy resin, 0.1-0.5 parts of dibutyl phthalate, 0.01-0.01 parts of ethylenediamine 0.1 part and 0.1 to 1 part of acetone; 1 part of epoxy resin, 0.2 part of dibutyl phthalate, 0.08 part of ethylenediamine and 0.4 part of acetone.

The above-mentioned quartz sand is divided into B type and C type, and its quartz content is 99.9%. The particle size analysis is shown in Table 1. The BC type sand is mixed with half of B type and half of C type.

       Table 1 The composition percentage of quartz sand grain size

The beneficial effect of the present invention is: the rock core that adopts above-mentioned ratio and method to make has better similarity with natural rock core in terms of pore structure and surface properties etc., by adjusting chemical composition and pressurized pressure, can produce Cores with different physical parameters and surface properties can meet the requirements of different core parameters for different experimental purposes. At the same time, the cores have good repeatability, which lays a material foundation for the establishment of the same experimental conditions. According to the principle of similarity, the heterogeneity state of the actual reservoir can be simulated by the heterogeneity model, but the natural core cannot do this, it is especially suitable for the performance evaluation of chemical displacement agents and profile control agents in heterogeneous reservoirs , At the same time, the production of rock cores has a wide range of raw materials and low prices, and can be mass-produced. The cost of a single rock core is much lower than that of natural rock cores.

Description of drawings:

Fig. 1 is the relation curve figure of the permeability of B molding sand of the present invention and cement content;

Fig. 2 is the relation graph of the permeability of the C mold sand of the present invention and cement content;

Fig. 3 is the relation graph of the permeability and pressure of B molding sand of the present invention;

Fig. 4 is the permeability and pressure relation curve figure of C mold sand of the present invention;

Fig. 5 is the structural representation of mould:

In Fig. 5, 1-pressure plate, 2-end plate, 3-side plate, 4-bolt, 5-bottom plate.

Detailed ways:

The present invention will be further described below: this quartz sand epoxy resin bonding heterogeneous model manufacturing method comprises the following steps: (1) mould: mold is made up of side plate 3, end plate 2, bottom plate 5 and pressing plate 1 (see attached Fig. 5), the bottom plate and the pressing plate are hard miscellaneous woods, the rest are carbon steel, and a group of bolt holes 4 are respectively arranged on the end faces of the two side plates, and the two side plates can be connected together by bolts; (2) ingredients: the model making material is mainly made of quartz The composition of sand is 85%-95% and cement 5%-15%. The materials are proportioned by weight. The model usually includes 3 permeable layers. The permeability of each layer of the model is different, and the material composition is also different; (3) sand mixing: according to Design the number of layers of the model, weigh the quartz sand and cement required for each layer, mix, stir, sieve, and reserve; (4) Sand loading: according to the upper and lower relationships designed for each permeable layer of the model, the corresponding cemented (5) Pressure forming: place the mold on the pressure testing machine, adjust the position of the mold so that it remains on the center line of the pressure bearing plate of the press, and then slowly rise to 14 ~83 standard atmospheric pressure, stabilize the pressure for 15 minutes, and release the pressure; (6) Heating and curing: put the pressed model into an oven, and cure at a constant temperature of 85°C for 6 to 8 hours. Turn off the power of the oven and let it cool down to room temperature naturally; (7) Sealing treatment: ① Cut the plate-shaped model into the size required for the experiment with a cutting machine; One end cover, a hole is drilled in the middle of the end cover, and a groove smaller than the outer edge of the end cover is processed on one side, and the outer edge of the end cover with groove is smeared with uncured epoxy resin, and connected to the end surface of the model; ③The surface of the anti-seepage treatment model is uniformly coated with thickened epoxy resin to form a thin layer with a thickness of about 1mm, so as to prevent the epoxy resin from invading the interior of the model during casting; Put it into a wooden mold, seal both ends with plasticine, then pour epoxy resin into the mold, and leave it at room temperature for 24 hours to get the model. ⑤Pressure test Take the cured model out of the mold, and test it with 0.8MPa gas to ensure no leakage; Design value deviation is not more than 10%.

Embodiment 1, (1) weigh material after the mold is installed, the material weighing of the high, medium and low 3 permeable layers of the model is respectively: the first layer: 85 grams of B-type quartz sand, 7.5 grams of epoxy resin, 2 grams of dibutyl phthalate, 0.5 grams of ethylenediamine and 5 grams of acetone, the second layer: 88 grams of B-type quartz sand, 6.0 grams of epoxy resin, 1.5 grams of dibutyl phthalate, ethylenediamine 0.5 grams and 4 grams of acetone, the third layer: 91.5 grams of B-type quartz sand, 5.5 grams of epoxy resin, 1 gram of dibutyl phthalate, 0.5 grams of ethylenediamine and 1.5 grams of acetone, mix each layer of materials and stir , sieve, and reserve; put the first layer, second layer and third layer of materials into the mold in turn, and manually compact; put the mold on the pressure testing machine, adjust the position of the mold so that it remains on the pressure plate of the press On the center line, then slowly increase the pressure to 83 standard atmospheric pressure, stabilize the pressure for 15 minutes, and release the pressure; put the pressed model into the oven, and cure it at a constant temperature of 85°C for 6 hours, turn off the power of the oven, and naturally cool to room temperature; ( 2) Sealing treatment: Use a cutting machine to cut the plate model into a size of length × width × height = 30 × 4.5 × 4.5cm; process a 1cm thick Bakelite board into a square end cover of length × width = 4.5 × 4.5cm, end cover There is an M8 hole drilled in the middle part, and a groove of length×width×depth=4.0×4.0×0.3cm is processed on one side with a milling machine, and the outer edge of the grooved surface of the end cover is coated with uncured epoxy resin, and let it Connect with the end face of the model; spread the thickened epoxy resin evenly on the remaining surface of the model to form a thin layer with a thickness of about 1mm; put the model with the end cap and the surface treatment into the wooden mold, and use rubber at both ends Seal it with mud, then pour epoxy resin into the mold, and leave it at room temperature for 24 hours to get the model.

Embodiment 2, (1) weigh material after the mold is installed, the material weighing of the high, medium and low 3 permeable layers of the model is respectively: the first layer: 90 grams of C-type quartz sand, 5.0 grams of epoxy resin, 1.2 grams of dibutyl phthalate, 0.5 grams of ethylenediamine and 3.3 grams of acetone, the second layer: 88 grams of C-type quartz sand, 6.0 grams of epoxy resin, 1.5 grams of dibutyl phthalate, ethylenediamine 0.5 grams and 4 grams of acetone, the third layer: 92 grams of C-type quartz sand, 4.5 grams of epoxy resin, 1.3 grams of dibutyl phthalate, 0.5 grams of ethylenediamine and 1.7 grams of acetone, mix the materials in each layer and stir , sieve, and reserve; put the first layer, second layer and third layer of materials into the mold in turn, and manually compact; put the mold on the pressure testing machine, adjust the position of the mold so that it remains on the pressure plate of the press On the center line, then slowly increase the pressure to 50 standard atmospheric pressure, stabilize the pressure for 15 minutes, and release the pressure; put the pressed model into the oven, and cure it at a constant temperature of 85 ° C for 8 hours, turn off the power of the oven, and naturally cool to room temperature; ( 2) Sealing treatment: use a cutting machine to cut the plate-shaped model into a size of length × width × height = 30 × 30 × 4.5cm; process a 1cm thick bakelite board into a rectangular end cover of length × width = 30 × 4.5cm, the end cover There is an M8 hole drilled in the middle of the cover, and a groove of length × width × depth = 29 × 4.0 × 0.3cm is machined on one side with a milling machine, and the outer edge of the end cover with the groove is coated with uncured epoxy resin, and let it Connect with the end face of the model; spread the thickened epoxy resin evenly on the remaining surface of the model to form a thin layer with a thickness of about 1mm; put the model with the end cap and the surface treatment into the wooden mold, and use rubber at both ends Seal it with mud, then pour epoxy resin into the mold, and leave it at room temperature for 24 hours to get the model.

Embodiment 3, (1) weighing material after mold is installed, the material weighing of this model high, middle and low 3 penetration layers is respectively: the first layer: C type quartz sand 90 grams, epoxy resin 5.0 grams, 1.2 grams of dibutyl phthalate, 0.5 grams of ethylenediamine and 3.3 grams of acetone, the second layer: 92 grams of C-type quartz sand, 4.5 grams of epoxy resin, 1.3 grams of dibutyl phthalate, ethylenediamine 0.5 grams and 1.7 grams of acetone, the third layer: 95 grams of C-type quartz sand, 3.0 grams of epoxy resin, 0.6 grams of dibutyl phthalate, 0.2 grams of ethylenediamine and 1.2 grams of acetone, mix the materials in each layer and stir , sieved, and set aside; put the first layer, second layer, and third layer of materials into the mold in turn, and compact them manually; put the mold on the pressure testing machine, adjust the position of the mold so that it remains on the pressure plate of the press On the center line, then slowly increase the pressure to 14 standard atmospheric pressure, stabilize the pressure for 15 minutes, and release the pressure; put the pressed model into the oven, and cure it at a constant temperature of 85°C for 7 hours, turn off the power of the oven, and naturally cool to room temperature; ( 2) Sealing treatment: Use a cutting machine to cut the plate model into a size of length × width × height = 30 × 4.5 × 4.5cm; process a 1cm thick bakelite board into a square end cover of length × width = 4.5 × 4.5cm, end cover There is an M8 hole drilled in the middle of the cover, and a groove of length × width × depth = 4.0 × 4.0 × 0.3cm is processed on one side with a milling machine, and the outer edge of the end cover with the groove is coated with uncured epoxy resin, and let it Connect with the end face of the model; spread the thickened epoxy resin evenly on the remaining surface of the model to form a thin layer with a thickness of about 1mm; put the model with the end cap and the surface treatment into the wooden mold, and use rubber at both ends Seal it with mud, then pour epoxy resin into the mold, and leave it at room temperature for 24 hours to get the model.

Claims (3)

1. A method for making a quartz sand epoxy resin cemented heterogeneous model, comprising the following steps: (1) Mold: The mold is composed of side plates, end plates, bottom plates and pressure plates; (2) Ingredients: Model making materials are mainly composed of 85% to 95% of quartz sand and 5% to 15% of cement, and the proportion of materials is by weight. The model usually includes 3 permeable layers; (3) Sand mixing: According to the number of layers designed by the model, the quartz sand and cement required for each layer are weighed, mixed, stirred, sieved, and set aside; (4) Sand loading: according to the upper and lower relationship designed for each permeable layer of the model, respectively put the corresponding sand containing cement into the mold one by one, and manually compact it; (5) Press forming: place the mold on the pressure testing machine, adjust the position of the mold so that it remains on the center line of the pressure plate of the press, then slowly rise to 14 to 83 standard atmospheric pressure, stabilize the pressure for 15 minutes, and release the pressure; (6) Heating and curing: put the pressed model into an oven, and cure it at a constant temperature of 85°C for 6-8 hours, turn off the power of the oven, and naturally cool to room temperature; (7) Sealing treatment: ① cutting Use a cutting machine to cut the plate model into the size required for the experiment; ②End cover bonding Process a 1cm-thick Bakelite board into an end cover with the same size as the end face of the model. A hole is drilled in the middle of the end cover, and a groove smaller than the outer edge of the end cover is processed on one side. Apply uncured epoxy resin to the edge and let it connect with the end face of the model; ③Apply the thickened epoxy resin evenly on the remaining surface of the anti-seepage treatment model to form a thin layer with a thickness of about 1mm; ④ Casting Put the model with end caps and surface treatment into a wooden mold, seal the two ends with plasticine, then pour epoxy resin into the mold, and leave it at room temperature for 24 hours to get the model. 2. The method for making heterogeneous models cemented with quartz sand and epoxy resin according to claim 1, wherein the cement is composed of epoxy resin and three kinds of additives, and the ratio of epoxy resin and additives is by weight: 0.5-1.5 parts of epoxy resin, 0.1-0.5 parts of dibutyl phthalate, 0.01-0.1 parts of ethylenediamine and 0.1-1 part of acetone. 3. The method for making heterogeneous models cemented with quartz sand epoxy resin according to claim 2, characterized in that: 1 part of epoxy resin, 0.2 part of dibutyl phthalate, 0.08 part of ethylenediamine and 0.4 part of acetone share.

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