CN110685680A - Large-size multi-angle acid etching crack acid liquid evaluation device and method - Google Patents
Large-size multi-angle acid etching crack acid liquid evaluation device and method Download PDFInfo
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- CN110685680A CN110685680A CN201911099452.9A CN201911099452A CN110685680A CN 110685680 A CN110685680 A CN 110685680A CN 201911099452 A CN201911099452 A CN 201911099452A CN 110685680 A CN110685680 A CN 110685680A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Abstract
The invention discloses a large-size multi-angle acid etching fracture acid liquid evaluation device and a method, wherein the device comprises a liquid storage tank, a constant flow pump, a high-pressure storage tank, an oil press, a multi-angle multi-fracture system, a data acquisition card and a computer, wherein the inlet end of the high-pressure storage tank is connected with the liquid storage tank through the constant flow pump, the outlet end of the high-pressure storage tank is connected with the inlet end of the multi-angle multi-fracture system, and the outlet end of the multi-angle multi-fracture system; the multi-angle multi-crack system comprises a rock plate holder and rock plates, wherein the rock plates are arranged in the rock plate holder, a main crack and a plurality of secondary cracks are arranged between 2 rock plates, the secondary cracks are connected with a recovery system and a vacuum pump through pipelines, and a pressure sensor is arranged at the junction of the secondary cracks and the main cracks; by utilizing the device, the diversion efficiency, the diversion time, the diversion range and the diversion pressure change rule of the cooperative diversion of the diverting acid and the solid diverting agent under different fracture scales can be evaluated.
Description
Technical Field
The invention relates to the technical field of experimental devices, in particular to a large-size multi-angle acid-etched fracture acid liquid evaluation device and method.
Background
The petroleum is used as the national strategic energy, and has important practical significance on the exploitation benefit. The acid fracturing is a measure for increasing production and injection and an important well completion measure which are widely adopted in the development of oil fields at home and abroad at present. Fracturing without proppant using acid as the fracturing fluid is known as acid fracturing. In the process of acidizing and fracturing, on one hand, cracks are formed under the action of water power, on the other hand, the wall surfaces of the cracks are corroded into uneven surfaces under the action of corrosion of acid liquor, and after the pump is stopped to relieve pressure, the wall surfaces of the cracks cannot be completely closed, so that the acidizing and fracturing fluid has high flow conductivity, can improve the permeability of a bottom layer, improves the characteristics of a stratum and finally achieves the purpose of increasing the yield of an oil reservoir.
The acid fracturing is a key technology for oil field production building, production stabilizing and yield increasing, and the application of the acid fracturing technology is closely related to the measurement of the indoor rock acid liquid diversion effect. Currently, the diversion acid diversion efficiency is generally evaluated by repeatedly measuring the diversion capacities of different rock plates through a single-crack diversion capacity test system, and then calculating the diversion acid diversion efficiency according to the diversion capacity data, so that the influence between cracks is ignored, and the difference from the actual situation is large; at present, more related single-crack diversion capability testing devices exist, the existing acid corrosion crack acid liquor diversion evaluation device is mostly a single clamp holder, when multiple groups of experiments are carried out, the experiments at each time need to be corrected, the process is complicated and time-consuming, the diversion effect cannot be visually seen in later observation, and the contrast is not strong. The invention provides an acid liquor diversion effect evaluation device of a large-scale, multi-angle and multi-fracture system capable of simulating formation temperature and pressure conditions, which is needed to evaluate the steering time, steering range and steering pressure change rule of steering acid and solid steering agent cooperative steering under different fracture scales under the influence of factors such as steering acid performance, acid liquor consumption, steering agent (fiber and particle) combination mode, particle size, concentration, injection rate and the like.
Disclosure of Invention
Aiming at the problems, the invention provides a large-size multi-angle acid etching fracture acid liquid evaluation device which can evaluate the flow dividing efficiency, the steering time, the steering range and the steering pressure change rule of the cooperative steering of steering acid and a solid steering agent under different fracture scales.
The invention adopts the following technical scheme:
a large-size multi-angle acid etching fracture acid liquid evaluation device comprises a liquid storage tank, a constant flow pump, a high-pressure storage tank, an oil press, a multi-angle multi-fracture system, a data acquisition card and a computer, wherein the inlet end of the high-pressure storage tank is connected with the liquid storage tank through the constant flow pump, the outlet end of the high-pressure storage tank is connected with the inlet end of the multi-angle multi-fracture system, and the outlet end of the multi-angle multi-fracture system is provided;
the multi-angle multi-crack system comprises a rock plate holder and rock plates, wherein the rock plates are arranged in the rock plate holder, a main crack and a plurality of secondary cracks are arranged between 2 rock plates, the secondary cracks are connected with a recovery system and a vacuum pump through pipelines, and a pressure sensor is arranged at the junction of the secondary cracks and the main cracks;
the multi-angle multi-crack system is arranged below a pressing plate of the oil press.
Preferably, the recovery system comprises a beaker, a balance and a back pressure valve, one end of the back pressure valve is connected with the outlet end of the secondary crack, the other end of the back pressure valve is connected with the beaker, and the beaker is placed on the balance.
Preferably, the balance and the pressure sensor are both connected with a computer through a data acquisition card; and a flowmeter and a pressure gauge are arranged on a pipeline for connecting the high-pressure storage tank with the multi-angle multi-crack system.
Preferably, electric heating wires are arranged around the main crack and the plurality of secondary cracks.
A method for utilizing a large-size multi-angle acid etching fracture acid liquor evaluation device comprises the following steps:
s1, after the device is installed, vacuumizing the device, and then putting the target acid liquid into a high-pressure storage tank;
s2, applying pressure to the multi-angle multi-crack system to a target pressure, and heating to a target temperature;
s3, displacing the multi-angle multi-crack system by using the target acid liquor;
s4, recording the flow and pressure of the secondary fracture, and calculating the diversion acid diversion efficiency; and judging the steering time and the steering pressure of the steering acid according to the changes of the flow and the pressure.
A method for utilizing a large-size multi-angle acid etching fracture acid liquor evaluation device comprises the following steps:
s11, replacing the target acid liquid with a mixture of the target acid liquid and the solid diverting agent, and performing the same experimental steps as the steps S1-S4;
and S12, after the experiment is finished, opening the rock plate and measuring the invasion depth of the solid diverting agent.
Preferably, in step S2, the target pressure is 10-40MPa and the target temperature is 70-90 ℃.
Preferably, in step S3, the displacement flow rate of the displacement is 3.5 ml/min.
The invention has the beneficial effects that: the invention can more accurately evaluate the diversion acid diversion efficiency, the cooperative diversion efficiency of the diversion acid and the solid diversion agent, and test the diversion pressure and the diversion time. The test results of the diversion efficiency, the steering pressure, the steering time and the invasion depth have important guiding significance for the yield increasing transformation of the oil field.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is apparent that the drawings in the following description only relate to some embodiments of the present invention and are not limiting on the present invention.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a multi-angle multi-fracture system of the present invention;
FIG. 3 is a front view of the multi-angle multi-fracture system of the present invention;
FIG. 4 is a schematic structural view of a multi-angle multi-fracture system and a recovery system according to the present invention.
Wherein the content of the first and second substances,
1-liquid storage tank, 2-advection pump, 3-high pressure storage tank, 4-oil press, 5-rock plate holder, 6-multi-angle multi-crack system, 7-beaker, 8-balance, 9-data acquisition card, 10-computer, 11-vacuum pump, 12-flowmeter, 13-pressure gauge, 14-rock plate, 15-back pressure valve, 16-electric heating wire
20-main crack, 21-secondary crack, 22-pressure sensor
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of the word "comprising" or "comprises", and the like, in this disclosure is intended to mean that the elements or items listed before that word, include the elements or items listed after that word, and their equivalents, without excluding other elements or items. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
The invention is further illustrated with reference to the following figures and examples.
As shown in fig. 1 to 4, a large-size multi-angle acid etching fracture acid liquid evaluation device comprises a liquid storage tank 1, a constant flow pump 2, a high-pressure storage tank 3, an oil press 4, a multi-angle multi-fracture system 6, a data acquisition card 9 and a computer 10, wherein the lower end of the constant flow pump 2 is connected with the liquid storage tank 1 through a pipeline, the upper end of the constant flow pump is connected with the inlet end of the high-pressure storage tank 3 through a pipeline, the outlet end of the high-pressure storage tank 3 is connected with the inlet end of the multi-angle multi-fracture system 6 through a pipeline, and a flowmeter 12 and;
the multi-angle multi-crack system 6 comprises a rock plate holder 5 and a rock plate 14, the rock plate 14 is arranged in the rock plate holder 5, the rock plate holder 5 is formed by two box-shaped alloy plates which are buckled together, a plurality of liquid outlet holes are formed in the periphery of the rock plate holder 5, sealing rings are arranged at the liquid outlet holes, the number of the rock plates 14 is 2, the structure is of a mirror symmetry structure, a secondary crack groove and a main crack groove are formed in the mode that each rock plate 14 is chiseled or passes through a casting mold, the main crack 20 and the secondary crack 21 are formed when the 2 rock plates 14 are combined together, a pressure sensor 22 is arranged at the junction of the secondary crack 21 and the main crack 20, and the pressure sensor 22 is used for measuring the steering pressure of target acid liquor. Said secondary fractures 21 are connected to the outside through outlet holes in the rock plate holder 5, i.e. the secondary fractures 21 are connected to the recovery system and the vacuum pump 11 through pipelines.
The outlet end of the multi-angle multi-crack system 6 is connected with a recovery system and a vacuum pump 11 arranged behind the multi-angle multi-crack system through pipelines; recovery system includes beaker 7, balance 8, back pressure valve 15, the exit end of secondary crack 21 is connected to the one end of back pressure valve 15, and beaker 7 is connected to the other end, vacuum pump 11 is connected at the left end of back pressure valve 15, the beaker is placed on balance 8. The balance 8 and the pressure sensor 22 are both connected with the computer 10 through the data acquisition card 9.
A method for utilizing a large-size multi-angle acid etching fracture acid liquor evaluation device comprises the following steps:
evaluation of diversion acid diversion efficiency:
s1, after the device is installed, vacuumizing the device, and then placing the target acid liquid into the high-pressure storage tank 3, wherein the target acid liquid and the acid liquid used by the target stratum are configured in the same mode.
S2, placing the multi-angle multi-fracture system 6 between an upper pressing plate and a lower pressing plate of an oil press 4, applying pressure to the multi-angle multi-fracture system 6 to 10MPa (according to the actual pressure of a target stratum) by using the oil press, and opening an electric heating wire (containing a temperature controller) to heat the multi-angle multi-fracture system 6 to 90 ℃ (according to the actual temperature of the target stratum);
s3, opening a valve on the device and the advection pump 2, setting the flow of the advection pump 2 to be 3.5ml/min, and using target acid liquor to displace the multi-angle multi-crack system 6;
s4, recording the reading Delta m of a balance 8 connected with each secondary crack 21(4 cracks) in unit time Delta t, the reading of a pressure gauge 13 and the outlet pressure (atmospheric pressure); calculating diversion acid (target acid liquid) diversion efficiency; and judging the steering time and the steering pressure of the target acid liquid according to the changes of the flow and the pressure. The experimental data are shown in table 1.
Table 1 evaluation experiment data acquisition table for diverting acid diversion efficiency
The calculation method is as follows:
and (3) solving the flow of the target acid solution according to the reading of the balance:
in the formula QiFlow of crack, cm3/min；
Rho-target acid system density, g/m3；
Δ t-time, min;
Δmimass difference, g, over a certain balance Δ t time.
Calculating the flow conductivity of the target acid liquid:
Wf＝x1-x2 (3)
in the formula kiRock permeability, μm2；
WfiCrack width, μm2·cm；
Mu-viscosity of the target acid solution at the test temperature, mPa & s;
Δpi-a rock plate inlet and outlet pressure difference (Pi-P5), kPa;
x1 — upper displacement sensor, mm;
x 2-lower displacement sensor, mm.
The diversion efficiency of the target acid solution is calculated as follows:
in the formula (kW)f)maxMaximum conductivity, μm2·cm；
(kWf)minMaximum conductivity, μm2·cm；
n is the number of cracks, and is dimensionless;
eta-split efficiency, dimensionless.
According to an experimental data acquisition table and a formula (1) -a formula (4), calculating the flow dividing efficiency of the target acid liquid as follows: 84.42 percent.
A method for utilizing a large-size multi-angle acid etching fracture acid liquor evaluation device comprises the following steps:
method for evaluating flow splitting efficiency of mixture of target acid liquid and solid diverting agent
S11, replacing the target acid liquid with a mixture of the target acid liquid and the solid diverting agent, and performing the same experimental steps as the steps S1-S4;
and S12, after the experiment is finished, opening the rock plate and measuring the invasion depth of the solid diverting agent.
TABLE 2 Experimental data acquisition table for evaluating shunt efficiency of mixture of target acid liquid and solid diverting agent
According to an experimental data acquisition table and a formula (1) -a formula (4), calculating the flow dividing efficiency of the target acid liquid as follows: 92.25 percent.
Through two groups of experimental evaluation, the steering performance of the steering acid and the solid steering agent can be well illustrated. The diversion efficiency of the first group of experiment diversion acid is 84.42%, the explanation turns to that the acid has a good diversion reposition of redundant personnel effect, the diversion efficiency that the second group of experiment diversion acid and solid diverting agent mixed system is 92.25%, better than first group efficiency, the explanation solid diverting agent helps the diversion of the acid, can improve steering pressure simultaneously, shorten and turn to the time, through controlling solid diverting agent dosage, can control the invasion depth of solid diverting agent, the increase production transformation to the oil field has important guiding significance.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A large-size multi-angle acid etching fracture acid liquid evaluation device is characterized by comprising a liquid storage tank (1), a constant flow pump (2), a high-pressure storage tank (3), an oil press (4), a multi-angle multi-fracture system (6), a data acquisition card (9) and a computer (10), wherein the inlet end of the high-pressure storage tank (3) is connected with the liquid storage tank (1) through the constant flow pump (2), the outlet end of the high-pressure storage tank is connected with the inlet end of the multi-angle multi-fracture system (6), and the outlet end of the multi-angle multi-fracture system (6) is provided with a recovery system;
the multi-angle multi-fracture system (6) comprises a rock plate holder (5) and rock plates (14), wherein the rock plates (14) are arranged in the rock plate holder (5), a main fracture (20) and a plurality of secondary fractures (21) are arranged between 2 rock plates (14), the secondary fractures (21) are connected with a recovery system and a vacuum pump (11) through pipelines, and pressure sensors (22) are arranged at junctions of the secondary fractures (21) and the main fractures (20);
the multi-angle multi-crack system (6) is arranged below a pressing plate of the oil press (4).
2. The large-size multi-angle acid-etched fracture acid liquor evaluation device according to claim 1, wherein the recovery system comprises a beaker (7), a balance (8), and a back pressure valve (15), one end of the back pressure valve (15) is connected with an outlet end of the secondary fracture (21), the other end of the back pressure valve is connected with the beaker (7), and the beaker is placed on the balance (8).
3. The large-size multi-angle acid etching fracture acid liquor evaluation device as claimed in claim 2, wherein the balance (8) and the pressure sensor (22) are connected with the computer (10) through a data acquisition card (9); and a flowmeter (12) and a pressure gauge (13) are arranged on a pipeline connecting the high-pressure storage tank (3) and the multi-angle multi-crack system (6).
4. The large-size multi-angle acid-etched fracture acid fluid evaluation device of claim 1, wherein an electric heating wire (16) is arranged around the main fracture (20) and the plurality of secondary fractures (21).
5. The method for utilizing the large-size multi-angle acid-etched fracture acid liquid evaluation device as claimed in claim 1, characterized by comprising the following steps:
s1, after the device is installed, vacuumizing the device, and putting the target acid liquor into a high-pressure storage tank (3);
s2, applying pressure to the multi-angle multi-crack system (6) to a target pressure, and heating to a target temperature;
s3, displacing the multi-angle multi-crack system (6) by using the target acid liquor;
s4, recording the flow and pressure of the secondary fracture (21), and calculating the diversion acid diversion efficiency; and judging the steering time and the steering pressure of the steering acid according to the changes of the flow and the pressure.
6. The method for utilizing the large-size multi-angle acid-etched fracture acid liquid evaluation device as claimed in claim 1, characterized by comprising the following steps:
s11, replacing the target acid liquid with a mixture of the target acid liquid and the solid diverting agent, and performing the same experimental steps as the steps S1-S4;
and S12, after the experiment is finished, opening the rock plate and measuring the invasion depth of the solid diverting agent.
7. The method for evaluating a large-sized multi-angle acid-etched fracture acid liquor as claimed in claim 6, wherein in step S2, the target pressure is 10-40MPa and the target temperature is 70-90 ℃.
8. The method for evaluating a large-size multi-angle acid-etched fracture acid fluid according to claim 6, wherein in step S3, the displacement flow rate of the displacement is 3.5 ml/min.
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Cited By (1)
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| CN114459974A (en) * | 2020-10-21 | 2022-05-10 | 中国石油化工股份有限公司 | Evaluation device and evaluation method for stability of acid fracturing high-temperature temporary plugging agent |
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