CN110243708B - Method for testing flowing abrasion degree of precoated sand in deep sea special environment - Google Patents
Method for testing flowing abrasion degree of precoated sand in deep sea special environment Download PDFInfo
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Abstract
A method for testing the flowing abrasion degree of precoated sand in a deep sea special environment. The method comprises the following specific steps: carrying out pendant drop method test characterization and analysis on the breathable water-blocking precoated sand by using a contact angle measuring instrument, and recording the original hydrophobic angle of the breathable water-blocking sand of the type; carrying out original air permeability and hydrophobicity test on the same type of air permeability and water resistance precoated sand; preparing a breathable water-blocking precoated sand mortar solution, introducing the mortar solution into a high-temperature high-pressure reaction kettle, and simulating the conditions in the kettle to the working temperature and pressure of a target reservoir; setting an initial value of the rotation speed of the rotor in the kettle, starting an experiment, and stopping the experiment when the total distance of the rotation cycle is 3 times of the length of the horizontal well; filtering out the breathable water-blocking precoated sand by using a screen to obtain the breathable water-blocking precoated sand after the horizontal well gravel is remotely filled and abraded at high temperature and high pressure; and performing hydrophobic angle and air-permeable and water-resistant tests on the filtered air-permeable and water-resistant precoated sand again, and comparing the original test values to obtain the flowing abrasion degree of the precoated sand.
Description
Technical Field
The invention relates to a method applied to the technical field of yield increase and water control of horizontal wells of bottom water oil and gas reservoirs, in particular to a method for testing the flowing abrasion degree of precoated sand in a deep sea special environment.
Background
The technical problems existing in the field at present are that the traditional precoated sand testing method is difficult to combine with the actual working condition environment and the abrasion mechanism of the horizontal well gravel pack, and the effective improvement is not achieved until the filing of the text. The traditional air-permeable water-blocking sand abrasion testing method has the following defects: 1) only the air-permeable water-blocking precoated sand with the chemical coating is placed on a friction surface applying unidirectional external force to apply load dragging friction, and is difficult to combine with flowing rotary friction of actual air-permeable water-blocking precoated sand under the working condition of long-distance gravel filling of a horizontal well, and the damage of a high-temperature and high-pressure environment under the actual working condition to the chemical coating is greatly influenced, and the influence of the factor cannot be reflected by dragging load applying test; 2) the actual equivalent environmental conditions under the working condition of gravel packing cannot be added only through the simulation test of circulating injection equidistant pipe flow, and the influence of high temperature and high pressure on a chemical coating is still not solved. The two reasons all cause the high expectation value that selects for use ventilative tectorial membrane sand that blocks water for gravel packing, and the safety test working limit that obtains is bigger than normal, leads to the accuse water effect poor, has great influence to the whole extraction degree of oil gas reservoir.
Disclosure of Invention
In order to solve the technical problems mentioned in the background technology, the invention provides a method for testing the flowing abrasion degree of precoated sand in a deep sea special environment, and the method can be used for performing a guarantee test on the performance of special type of air-permeable water-blocking precoated sand in the deep sea special environment and after long-distance abrasion, and can be used for effectively improving the water control production efficiency.
The technical scheme of the invention is as follows: the method for testing the flowing abrasion degree of the precoated sand in the deep sea special environment comprises the following steps:
the method comprises the following steps: carrying out pendant drop method test characterization and analysis on the breathable water-blocking precoated sand by using a contact angle measuring instrument, and recording the original hydrophobic angle of the breathable water-blocking sand of the type;
by a contact angle measuring instrument, water is dripped on the spread breathable water-blocking precoated sand plane in a rotating mode to carry out contact angle testing;
step two: carrying out original air permeability and hydrophobicity test on the air permeability and water resistance precoated sand after the contact angle is tested in the step one; the specific path is as follows:
filling air-permeable water-blocking precoated sand into an iron cylinder, plugging two ends of the iron cylinder by using a screen, then filling the iron cylinder into a closed core holder, connecting a test system, loading a 30MPa constant-pressure air source at an injection end of the closed core holder after the test system is connected, loading back pressure at a production end, recording the gas production per minute by using a gas flowmeter through a gas-liquid separator, loading a constant-pressure water source at the injection end, loading back pressure at the production end, and recording the water production per minute by using a measuring cylinder; thereby testing the original air permeability and hydrophobicity of the air permeability and water resistance precoated sand;
step three, preparing a breathable water-blocking precoated sand mortar solution, and adding the breathable water-blocking precoated sand tested in the steps one to two into the clean sand carrying liquid solution, wherein the sand ratio is ensured to be 60%, and the total volume is 1000 mL;
step four, guiding the mixture formed in the step three into a high-temperature high-pressure rotary furnace kettle body, closing a kettle cover with a rotor, and simulating the conditions in the kettle to the target reservoir working temperature and pressure;
setting the temperature and pressure in the kettle body of the rotary furnace, setting the speed of a rotor to be 300 r/min after the temperature and the pressure are stable, starting an experiment, and enabling the flowing distance of the sand-carrying liquid per minute to follow a formula
Wherein
Is the flow distance, in m;
is the number of revolutions, in r/s;
is the inner diameter of the kettle body in m; wherein: the total time of the experiment was:
wherein:
is the horizontal well length, in units of m; stopping the experiment when the rotary flowing distance of the sand-carrying liquid is 3 times of the length of the horizontal well;
step five: taking out the substances in the high-temperature high-pressure rotary furnace kettle body processed in the fourth step, filtering out the air-permeable water-blocking precoated sand by using a screen, and then airing; obtaining the air-permeable water-blocking precoated sand after the horizontal well gravel is remotely filled and abraded under high temperature and high pressure;
step eight, carrying out contact angle test and air permeability and hydrophobicity test on the air permeability and water resistance precoated sand obtained in the step five again in the steps one to four;
and step nine, comparing the obtained results to obtain the damage degree and the variation of the air-permeable water-blocking performance of the air-permeable water-blocking precoated sand for horizontal well gravel filling under the high-temperature and high-pressure conditions in the flowing process.
The invention has the following beneficial effects: the invention can perform full simulation on the long-distance gravel packing abrasion working condition of the horizontal well in a circulating flow mode, simultaneously the controllable experimental condition is equal to the real environment, and the abrasion influence of high temperature and high pressure on the breathable water-blocking precoated sand coating is considered. The testing precision of the safety upper limit of the air permeability and water blocking sand performance under the special working condition of the remote gravel packing of the horizontal well can be greatly improved, and further the development effect of the horizontal well and the overall development benefit of an oil-gas field are improved. Therefore, the method for testing the long-distance wall-attached flowing abrasion circulation of the breathable water-blocking precoated sand provides an important opportunity for solving the problem of guaranteeing the working performance of the breathable water-blocking precoated sand in a special environment.
Description of the drawings:
FIG. 1 is a schematic diagram of a test system used in the practice of the present invention.
FIG. 2 is a schematic diagram of the reactor in the test system used in the practice of the present invention.
In the figure, 1-JGW-360A type contact angle measuring instrument, 2-iron cylinder wrapped air-permeable water-blocking precoated sand; 3-30MPa of constant pressure air source, 4-30MPa of constant pressure water source, 5-core holder, 6-back pressure valve, 7-gas-liquid separator, 8-gas flowmeter, 9-measuring cylinder, 10-high temperature and high pressure rotary furnace kettle cover with rotor, 11-high temperature and high pressure rotary furnace kettle body and 12-concave spoon-shaped flow plate.
The specific implementation mode is as follows:
the invention will be further described with reference to the accompanying drawings in which:
the method for testing the flowing abrasion degree of the precoated sand in the deep sea special environment comprises the following steps:
the method comprises the following steps: and (3) carrying out pendant drop method test characterization and analysis on the breathable water-blocking precoated sand by using a contact angle measuring instrument, and recording the original hydrophobic angle of the breathable water-blocking sand of the model. The contact angle measuring instrument adopts an JGW-360A type contact angle measuring instrument, and 5 mu L of water is dripped on the paved SFYX-I type breathable water-blocking precoated sand plane in a rotating mode to carry out contact angle test;
step two: carrying out original air permeability and hydrophobicity test on the air permeability and water resistance precoated sand after the contact angle is tested in the step one; the specific path is as follows:
filling air-permeable water-blocking precoated sand into an iron cylinder, plugging two ends of the iron cylinder by using a 200-mesh screen, then filling the iron cylinder into a closed core holder, connecting a test system, loading a 30MPa constant-pressure air source at an injection end of the closed core holder after connecting the test system, loading 28MPa back pressure at a production end, recording the gas production per minute by using a gas flow meter through a gas-liquid separator, loading a 30MPa constant-pressure water source at the injection end, loading 28MPa back pressure at the production end, and recording the water production per minute by using a measuring cylinder; thus testing the original air permeability and hydrophobicity of the air permeable water-blocking precoated sand;
step three, preparing a breathable water-blocking precoated sand mortar solution, and adding the breathable water-blocking precoated sand tested in the step one to the step two into a GJ-1 type cleaning sand carrying liquid solution with the concentration of 2%, wherein the sand ratio is ensured to be 60%, and the total volume is 1000 mL;
step four, guiding the mixture formed in the step three into a high-temperature high-pressure rotary furnace kettle body, closing a kettle cover with a rotor, and simulating the conditions in the kettle to the target reservoir working temperature and pressure;
setting the temperature in the kettle body of the rotary furnace to be 90 ℃ and the pressure to be 30MPa, setting the speed of a rotor to be 300 r/min after the temperature and the pressure are stable, starting an experiment, and enabling the flowing distance of the sand-carrying liquid per minute to follow a formula
In which
Is the flow distance, in m;
is the number of revolutions, in r/s;
is the inner diameter of the kettle body in m; wherein: the total time of the experiment was:
wherein:
is the horizontal well length in m; stopping the experiment when the rotation flowing distance of the sand-carrying liquid is at least 6 times of the length of the horizontal well;
step five: taking out the substances in the high-temperature high-pressure rotary furnace kettle body processed in the fourth step, filtering out the air-permeable water-blocking precoated sand by using a screen, and then airing; obtaining the air-permeable water-blocking precoated sand after the horizontal well gravel is remotely filled and abraded under high temperature and high pressure;
step eight, carrying out contact angle test and air permeability and hydrophobicity test on the air permeability and water resistance precoated sand obtained in the step five again in the steps one to four;
and step nine, comparing the obtained results to obtain the damage degree and the variable quantity of the air-permeable water-blocking performance of the air-permeable water-blocking precoated sand for horizontal well gravel filling under the high-temperature and high-pressure conditions in the flowing process.
Fig. 1 and fig. 2 are schematic structural diagrams of the test system described above. The equipment used in the figure is as follows: high temperature ultra low interfacial tension apparatus, SVT15N, german eastern delphire instruments ltd; high pressure gas cylinder, GB5099, 15MPa, xinjiang fenglong high pressure gas cylinder sales limited; piston container, ZR-3, 1000ml, petroleum research instruments Limited, Haian county; two-cylinder constant pressure constant speed pump, HBS-500/70, yangzhou huabao petroleum instruments limit company; boosting the gas or water in the middle-middle period to 30MPa by a parallel-bar constant-pressure constant-speed pump, and maintaining a constant pressure (constant-pressure water source) of 30MPa (constant-pressure gas source); core holder, TY-4 type, 25 × 25-3000mm, haian county borun petroleum instrument and fittings factory; backpressure control valve, YT-B, 50MPa, south China Huaxing Petroleum Ltd; wet gas flow meter, BSD0.5, 0.005-0.75m3/h, yozhou city communications instruments ltd. It should be specially noted that 3000ml of high-pressure high-temperature reaction kettle, Nantong Zhongjing mechanical manufacturing company, Inc., wherein the kettle body in the reaction kettle is not changed, the kettle cover and the sealing structure thereof are not changed, the diameter of the inner rotor of the reaction kettle is only increased, and a short driving spoon plate is attached to the rotor.
Specific examples of the present invention are given below.
Basic data of an X-bottom water gas field: the gas reservoir pressure is 30MPa, the reservoir temperature is 120 ℃, the horizontal section of the horizontal well is 300m long, 2% GJ-1 type cleaning solution is used as sand carrying liquid in the development and design stage, SFYX-I breathable water-blocking precoated sand is used as gravel for filling the horizontal well gravel, the bottom water coning is controlled by the breathable water-blocking performance of the breathable water-blocking precoated sand, and gas production is carried out by 2 production pressure differences. At the moment, whether the air-permeable water-blocking precoated sand still has good air-permeable water-blocking performance after passing through the deep sea special high-temperature and high-pressure environment and cooperating with the gravel filling working condition of the horizontal well needs to be accurately tested.
1. And (3) by using an JGW-360A type contact angle measuring instrument 1, 5 mu L of water is dripped on the plane of the spread SFYX-I type breathable water-blocking precoated sand in a rotating manner, and the SFYX-I type original contact angle is tested to be 66 degrees.
2. And (3) filling the SFYX-I type breathable water-blocking precoated sand of the same model after the contact angle test into an iron cylinder 2 with the diameter of 2.5cm and the length of 10cm, and then plugging two ends of the iron cylinder by using a 200-mesh screen. And (3) loading the blocked iron cylinder into a closed core holder 5, loading a 30MPa constant-pressure air source 3 at an injection end, loading a 28MPa back pressure 6 at a recovery end, and recording the stable air output per minute as 3.05L/min. In the same way, the injection end is loaded with a 30MPa constant-pressure water source 4.
3. And (3) adding the SFYX-I type breathable water-blocking precoated sand tested in the first step and the second step into a GJ-1 type clean sand carrying night solution with the concentration of 2%, wherein the sand ratio accounts for 60%, and the total volume is 1000 mL.
4. And (3) filling the sand-carrying liquid with the sand ratio of 60% in the step three into a high-temperature high-pressure rotary furnace kettle body 11, wherein the inner diameter of the rotary furnace is 15cm, the height of the rotary furnace is 20cm, the outer diameter of a rotor is 5cm, and the length of the rotor is 18 cm. Then setting the temperature in the rotary kiln at 120 ℃ and the pressure at 30MPa, setting the rotor speed at 300 r/min after the temperature and the pressure are stable, starting the experiment according to the formula
And (3) calculating the total experiment time to 12.73min, wherein the flow distance of the sand-carrying solution in the rotary furnace axe body is 1800, and the flow distance is 6 times of the length of the horizontal well 300m, and stopping the experiment.
5. And taking out the sand carrying liquid after the flow experiment in the rotary furnace, filtering the precoated sand by using a 200-mesh screen, and drying. And (3) repeating the step (1) on the precoated sand, measuring that the hydrophobic contact angle of the precoated sand is 20 degrees, repeating the test work of the step (2), loading a 30MPa constant-pressure air source (3) on the injection end, loading a 28MPa back pressure (6) on the extraction end, and recording that the stable gas output per minute is 3.08L/min. The injection end is loaded with a 30MPa constant-pressure water source 4, the extraction end is loaded with a 28MPa back pressure 6, the stable water yield per minute is recorded to be 1.6L/min, the air permeability is almost unchanged, and the water resistance is seriously reduced.
6. The test result of the SFYX-I type precoated sand subjected to the special high-temperature high-pressure environment horizontal well gravel filling working condition is unqualified according to the steps, the SFYX-I type precoated sand does not have the water-blocking and air-permeable functions, and the water-controlling and oil-increasing effect of a bottom water oil-gas reservoir cannot be achieved when the SFYX-I type precoated sand is injected into a reservoir. However, the steps are repeated, only the temperature condition in the kettle is adjusted to 90 ℃, the model of the air-permeable water-blocking precoated sand still has a good air-permeable water-blocking performance contact angle of 62 degrees, the gas flow is 3.11L/min during 2-pressure-difference production, and the water yield is 10 ml/min. Therefore, when other conditions are unchanged, the obtained SFYX-I type breathable water-blocking precoated sand can be used for water control and oil increase of bottom water oil and gas reservoirs with reservoir temperatures lower than 90 ℃.
Claims (1)
1. A method for testing the flowing abrasion degree of precoated sand in a deep sea special environment comprises the following steps:
the method comprises the following steps: carrying out pendant drop method test characterization and analysis on the breathable water-blocking precoated sand by using a contact angle measuring instrument, and recording the original hydrophobic angle of the breathable water-blocking precoated sand;
step two: carrying out original air permeability and hydrophobicity test on the air permeability and water resistance precoated sand after the contact angle is tested in the step one; the specific path is as follows:
filling air-permeable water-blocking precoated sand into an iron cylinder, plugging two ends of the iron cylinder by using a screen, then filling the iron cylinder into a closed core holder, connecting a test system, loading a 30MPa constant-pressure air source at an injection end of the closed core holder after the test system is connected, loading back pressure at a production end, recording the gas production per minute by using a gas flowmeter through a gas-liquid separator, loading a constant-pressure water source at the injection end, loading back pressure at the production end, and recording the water production per minute by using a measuring cylinder; thus testing the original air permeability and hydrophobicity of the air permeable water-blocking precoated sand;
step three, preparing a breathable water-blocking precoated sand mortar solution, and adding the breathable water-blocking precoated sand tested in the steps one to two into the clean sand carrying liquid solution, wherein the sand ratio is ensured to be 60%, and the total volume is 1000 mL;
step four, guiding the mixture formed in the step three into a high-temperature high-pressure rotary furnace kettle body, closing a kettle cover with a rotor, and simulating the conditions in the kettle to the target reservoir working temperature and pressure; after the temperature and the pressure are stable, the speed of the rotor is set, the experiment is started, and the flowing distance of the sand carrying liquid per minute follows the formula Lflow dω × π × D, wherein Lflow dIs the flow distance, in m; ω is the number of revolutions, in r/s; d is the inner diameter of the kettle body in m; wherein: the total time of the experiment was: t is 6 × Lhorizontal w÷Lflow dWherein: l is a radical of an alcoholhorizontal wIs the horizontal well length, in units of m; stopping the experiment when the rotary flowing distance of the sand carrying liquid is 6 times of the length of the horizontal well;
step five: taking out the substances in the high-temperature high-pressure rotary furnace kettle body processed in the fourth step, filtering out the air-permeable water-blocking precoated sand by using a screen, and then airing; obtaining the air-permeable water-blocking precoated sand after the horizontal well gravel is remotely filled and abraded under high temperature and high pressure;
step eight, carrying out contact angle test and air permeability and hydrophobicity test on the air permeability and water resistance precoated sand obtained in the step five again in the steps from the step one to the step two;
and step nine, comparing the obtained results to obtain the damage degree and the variation of the air-permeable water-blocking performance of the air-permeable water-blocking precoated sand for horizontal well gravel filling under the high-temperature and high-pressure conditions in the flowing process.
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| CN104913979B (en) * | 2015-06-29 | 2017-07-25 | 中国石油集团渤海石油装备制造有限公司 | A kind of corrosion-inhibiting coating high temperature high voltage resistant benchmark test device and test method |
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