CN108240953B - Device and method for evaluating performance of barite blocking remover - Google Patents
Device and method for evaluating performance of barite blocking remover Download PDFInfo
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- CN108240953B CN108240953B CN201611225068.5A CN201611225068A CN108240953B CN 108240953 B CN108240953 B CN 108240953B CN 201611225068 A CN201611225068 A CN 201611225068A CN 108240953 B CN108240953 B CN 108240953B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
Abstract
The invention discloses a device and a method for evaluating performance of a barite blocking remover. This device is appraised to barite blocking remover performance includes: the system comprises a rock core clamping system, a liquid permeability measuring system, a barite drilling fluid injection system, a barite blocking remover injection system and a temperature control system; the core clamping system comprises a clamp holder capable of clamping a core, and a first pump which is connected with the clamp holder and is used for applying confining pressure to the core; the liquid permeability measuring system is connected with the first end of the holder; the barite drilling fluid injection system is connected with the second end of the holder; the barite blocking remover injection system is connected with the second end of the holder; the temperature control system is used for heating liquid in the liquid permeability measuring system, the barite drilling fluid injection system and the barite blocking remover injection system and the clamp. The device is closer to the field practical application condition in the evaluation process of the barite blocking remover.
Description
Technical Field
The invention relates to the technical field of oilfield development, in particular to a device and a method for evaluating the performance of a barite blocking remover.
Background
In recent years, with the longitudinal development of exploration and development of oil and gas resources, the number of deep wells and ultra-deep wells is increased. Due to the generally high pressure coefficient of deep well and ultra-deep well formations, flooding, kick and even blowout phenomena may occur during the drilling process by using the conventional drilling fluid. In order to ensure the safe and smooth drilling operation, weighting agents such as barite and limestone are generally used to weight the drilling fluid to prevent overflow, kick or blowout during the drilling process.
Barite is the drilling fluid weighting agent which is most widely applied at present, and can be used for weighting the drilling fluid with the density not more than 2.30g/cm3The drilling fluid of (1). The grain size of the barite used at present is mostly between 40 and 80 mu m, and the grain size is small. When the barite is used in a drilling fluid, the small particle size is generally adopted to reduce the sedimentation rate of the barite in the drilling fluid so as to avoid the barite from settling at the bottom of a well bore and affecting the stability of the drilling fluid.
The barite used as the weighting agent has the disadvantages that in the circulating drilling process, the small-particle-size barite enters a reservoir stratum along with well drilling fluid under the action of differential pressure, is retained in the pore throat and cracks of the reservoir stratum, blocks a flow channel of oil gas, has more obvious blocking effect on low-permeability and ultra-low-permeability oil gas wells, slightly reduces the productivity of the oil gas wells after drilling, and seriously influences geological understanding and oil gas exploration progress because oil gas can not be tried out.
Because the chemical property of the barite is stable, the barite is insoluble in water and acid liquor. Therefore, after the drilling and completion of the oil and gas well, the barite remained in the reservoir needs to be pretreated, and the barite is usually dissolved and dispersed by using the barite blocking remover, so that the blockage of the pore throat and the cracks of the reservoir by the barite is removed, an oil and gas flow channel is smooth, and the productivity of the oil and gas well is fully released.
At present, the research on the barite blocking remover mainly focuses on the single-agent development and formula optimization of the blocking remover. For the evaluation of the performance of the blocking remover, a weight loss method or a precipitation method is generally adopted. The performance evaluation methods of the two barite blocking removers are both used for evaluating the blocking removal performance of the blocking remover on the rock core by directly comparing the quality change of the barite after the barite is corroded by the blocking remover in a static environment, and the blocking removal performance of the blocking remover on the rock core in the actual production process cannot be truly reflected. Thereby having limited guiding effect on the field application of the barite blocking remover.
Therefore, a device capable of simulating the evaluation of the blocking removal performance of the barite blocking remover in the actual production process is needed.
Disclosure of Invention
In order to solve the technical problems, the invention provides a device and a method for evaluating the performance of a barite blocking remover. The technical scheme is as follows:
in one aspect, the invention provides a performance evaluation device for a barite blocking remover, which comprises:
the system comprises a rock core clamping system, a liquid permeability measuring system, a barite drilling fluid injection system, a barite blocking remover injection system and a temperature control system;
the core clamping system comprises a holder capable of clamping a core, and a first pump connected with the holder and used for applying confining pressure to the core;
the liquid permeability measuring system is connected with the first end of the holder;
the barite drilling fluid injection system is connected with the second end of the holder;
the barite blocking remover injection system is connected with the second end of the holder;
the temperature control system is used for heating the liquid measuring permeability system, the barite drilling fluid injection system and the liquid in the barite blocking remover injection system, and the holder.
The system for measuring the permeability of the liquid comprises a first intermediate container and a second pump, wherein the first intermediate container is used for storing the liquid for testing the permeability of the rock core; the liquid outlet end of the first intermediate container is connected with the first end of the holder.
The barite drilling fluid injection system comprises a second intermediate container for storing the barite drilling fluid, and a third pump connected with the liquid inlet end of the second intermediate container; the liquid outlet end of the second intermediate container is connected with the second end of the holder.
The barite blocking remover injection system comprises a third intermediate container for storing the barite blocking remover, and a fourth pump connected with a liquid inlet end of the third intermediate container; the liquid outlet end of the third intermediate container is connected with the second end of the holder.
Preferably, the liquid outlet end of the second intermediate container, the liquid outlet end of the third intermediate container and the connecting pipeline of the second end of the gripper form a closed loop.
More preferably, a rotary pump is arranged on a connecting pipeline between the liquid outlet end of the second intermediate container and the liquid outlet end of the third intermediate container of the closed loop.
Preferably, a first pressure sensor is arranged on a connecting pipeline of the clamp and the first pump.
More preferably, the liquid outlet end of the first intermediate container is connected with the first end of the clamping device, and a second pressure sensor is arranged on a pipeline close to the first end of the clamping device.
More preferably, a third pressure sensor is provided on a line of the closed loop near the second end of the gripper.
More preferably, a first electronic balance branch is arranged on a pipeline connecting the liquid outlet end of the first intermediate container and the first end of the holder; and a second electronic balance branch is arranged on a pipeline of the closed loop, which is close to the second end of the holder.
In another aspect, the present invention provides a method for evaluating the performance of the barite blocking remover by using the above apparatus, comprising the steps of:
1) putting the core into the holder, and starting a first pump to apply confining pressure on the core;
2) starting a temperature control system to measure the permeability of the liquid, the barite drilling fluid injection system and the liquid in the barite blocking remover injection system, and heating the holder to a preset temperature;
3) and starting the liquid permeability measuring system, and testing the initial permeability of the rock core, and recording as: k0；
4) Closing the liquid permeability measuring system, and opening the barite drilling fluid injection system to damage the rock core;
5) closing the barite drilling fluid injection system, opening the liquid permeability measuring system, testing the permeability of the rock core damaged by the barite drilling fluid, and recording as: k1；
6) Closing the liquid permeability measuring system, and opening the barite drilling fluid injection system to continue to damage the rock core;
7) closing the barite drilling fluid injection system, opening the barite blocking remover injection system, and unblocking the rock core damaged by the barite drilling fluid to a preset time;
8) closing the barite blocking remover injection system (4), opening the liquid permeability measuring system (2), testing the permeability of the blocked rock core, and recording as: k2；
9) Calculating the damage rate of the rock core
And permeability recovery of the core
The technical scheme provided by the embodiment of the invention has the beneficial effects that: according to the performance evaluation device for the barite blocking remover, the rock peripheral pressure in the reservoir is simulated by utilizing the confining pressure generated by the rock core clamping system on the rock core, and the blocking removal process after the barite damages the reservoir is dynamically simulated by utilizing the barite drilling fluid injection system, the liquid permeability measuring system and the barite blocking remover injection system. The whole process is closer to the plugging damage to the reservoir and the plugging removal process to the reservoir in the actual drilling process. Moreover, the device can realize indoor evaluation on the blocking removal performance of different reservoir types, drilling fluid types, different types and using amounts of blocking removal agents, can enhance the knowledge of the barite blocking removal agent, and provides effective guidance for type optimization, using amount optimization and the like of the blocking removal agent in field application.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of a performance evaluation device for a barite blocking remover according to an exemplary embodiment of the present invention;
fig. 2 is a schematic diagram of another barite blocking agent performance evaluation device according to an exemplary embodiment of the present invention;
the reference numerals in the drawings denote:
1. a core clamping system; 101. a holder; 1011. a first end of the holder; 1012. a second end of the holder; 102. a first pump; 2. a liquid permeability measuring system; 201. a first intermediate container; 202. a second pump; 3. a barite drilling fluid injection system; 301. a second intermediate container; 302. a third pump; 4. a barite blocking remover injection system; 401. a third intermediate container; 402. a fourth pump; 5. a temperature control system; 6. a rotary pump; 7. a first electronic balance; 8. a second electronic balance; p1, a first pressure sensor; p2, second pressure sensor; p3, third pressure sensor; v, a valve; v1, first valve; v2, second valve; v3, third valve; v4, fourth valve; v5, fifth valve; v6, sixth valve; v7, seventh valve; v8, eighth valve.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings.
In one aspect, referring to fig. 1, the present invention provides a performance evaluation apparatus for a barite blocking remover, comprising:
the system comprises a rock core clamping system 1, a liquid permeability measuring system 2, a barite drilling fluid injection system 3, a barite blocking remover injection system 4 and a temperature control system 5;
the core clamping system 1 comprises a clamp 101 capable of clamping a core, and a first pump 102 connected with the clamp 101 and used for applying confining pressure to the core;
the liquid permeability measuring system 2 is connected to a first end 1011 of the holder 101;
the barite drilling fluid injection system 3 is connected to the second end 1012 of the holder 101;
the barite blocking agent injection system 4 is connected with the second end 1012 of the clamper 101;
the temperature control system 5 is used to heat the liquid in the liquid permeability measurement system 2, the barite drilling fluid injection system 3, and the barite plugging agent injection system 4, as well as the holder 101.
The core clamping system 1 is used for clamping a core, and provides constant confining pressure for the core in the performance test process of the blocking remover, and peripheral pressure of the core in a reservoir is simulated.
The liquid permeability measuring system 2 is used for testing the initial permeability of the rock core, the permeability of the rock core damaged by the blockage of the barite drilling fluid and the permeability of the rock core unblocked by the barite blocking remover.
The barite drilling fluid injection system 3 is used for dynamically simulating damage to a rock core in a drilling process.
And the barite blocking remover injection system 4 is used for blocking the damaged rock core.
The temperature control system 5 is used to simulate the temperature of the reservoir in which the core is located.
In practical applications, the apparatus for evaluating the performance of the barite blocking remover may further include a data acquisition system (not shown in fig. 1) for acquiring data so as to evaluate the performance of the barite blocking remover.
In the actual oil field development process, the permeation direction of crude oil in a reservoir is opposite to the damage direction of the barite drilling fluid and the blockage removal direction of the barite blockage remover. Therefore, as shown in fig. 1, the liquid permeability measuring system 2 is arranged at the first end 1011 of the holder 101, and the barite drilling fluid injection system 3 and the barite blocking agent injection system 4 are respectively arranged at the second end 1012 of the holder 101, which is closer to the actual situation of actual oilfield exploitation.
According to the description, the performance evaluation device for the barite blocking remover provided by the invention is used for evaluating the barite blocking remover, and the whole process is closer to the blocking damage to a reservoir stratum and the blocking removal process to the reservoir stratum in the actual drilling process. Moreover, the device can realize indoor evaluation of the plugging removal performance of different reservoir types, different barite drilling fluid types and different barite plugging removal agent types and the amount thereof by replacing cores from different reservoirs, different barite drilling fluids and the barite plugging removal agent and the amount thereof, can enhance the knowledge of the barite plugging removal agent, and provides effective guidance for optimization of the type, the amount and the like of the barite plugging removal agent in field application.
The first end of the holder in the present invention may be the first end 1011 of the holder in fig. 1, i.e. the left end of the holder, and the second end of the holder may be the second end 1012 of the holder in fig. 1, i.e. the right end of the holder.
The structure of the core clamping system will be described in detail below.
As shown in fig. 1 and 2, the core holding system 1 includes a holder 101 capable of holding a core, and a first pump 102 connected to the holder 101 for applying confining pressure to the core.
In the performance test process of the barite blocking remover, the pressure of confining pressure provided by the first pump for the rock core needs to be kept unchanged all the time. Thus, the first pump may be set to a constant pressure mode, and the first pump may be a constant flow pump as is commonly used in the art. The first pump can draw water from the water tank to provide confining pressure for the core.
In order to measure the confining pressure of the core more accurately, a first pressure sensor P1 is provided on the connection line of the first pump 102 and the holder 101.
In order to facilitate the communication between the gripper 101 and the first pump 102, a valve V is provided in the connecting line between the two.
The structure of the liquidometer permeability system will be described in detail below.
As shown in fig. 2, the liquid permeability measuring system 2 includes a first intermediate container 201 for storing the liquid for measuring the permeability of the core, and a second pump 202 connected to an inlet end of the first intermediate container 201; the outlet end of the first intermediate container 201 is connected to the first end 1011 of the holder 101.
The first intermediate container 201 may be constructed to have two chambers controlled by pistons: a first chamber 2011 and a second chamber 2012. The first chamber 2011 is in communication with the second pump 202, and the second pump 202 can pump water from the water tank into the first chamber 2011 to push the liquid in the second chamber 2012 into the core.
The liquid contained in the second chamber is a liquid commonly used by those skilled in the art for testing the permeability of the rock core, and is generally a potassium chloride solution with the mass fraction of 3% -10%, and is preferably a potassium chloride solution with the mass fraction of 8%.
One skilled in the art can set the second pump 202 to a constant flow mode so that the volumetric flow rate of the liquid through the core and the pressure at the first end 1011 of the holder are known. The second pump may be a constant flow pump as is commonly used in the art.
In order to more accurately measure the pressure at the first end 1011 of the holder, a second pressure sensor P2 is provided in the line connecting the outlet end of the first intermediate container 201 to the first end 1011 of the holder 101, near the first end 1011 of the holder 101.
In order to more accurately meter the volumetric flow of liquid in the core from the hydrographic permeability system 2, a second electronic balance branch is provided in line with the second end 1012 of the holder 101. The change in the volume of the liquid, that is, the volume flow rate of the liquid is determined by measuring the density from the change in the mass of the second electronic balance 8 over a certain period of time. The second electronic balance branch is also designed to vent air in the line and to collect waste liquid during testing.
Of course, it is readily apparent to one skilled in the art that the volumetric flow rate of the liquid in the core from the hydrographic permeability system is measured using a liquid flow meter instead of the second electronic balance.
In order to facilitate the communication of the permeability system 2 with the holder 101, a valve V is provided in the line connecting the two.
In order to facilitate the cleaning of the connection line between the outlet end of the first intermediate container 201 and the first end 1011 of the holder 101, it is preferable to provide a cleaning line connected in parallel with the first intermediate container, and to provide a valve V on the cleaning line, and a second pump pumps water into the cleaning line to clean the connection line between the first intermediate container and the holder, or a second pump pumps water into the first intermediate container to push the liquid in the second chamber, such as 8% by mass potassium chloride solution, into the core and measure the permeability.
The structure of the barite drilling fluid injection system and the barite unblocking agent injection system will be described in detail below.
The barite drilling fluid injection system 3 comprises a second intermediate container 301 for storing the barite drilling fluid, and a third pump 302 connected with the liquid inlet end of the second intermediate container 301; the outlet end of the second intermediate container 301 is connected to the second end 1012 of the holder 101.
The barite blocking remover injection system 4 comprises a third intermediate container 401 for storing the barite blocking remover, and a fourth pump 402 connected with the liquid inlet end of the third intermediate container 401; the outlet end of the third intermediate container 401 is connected to the second end 1012 of the holder 101.
For the construction of the second intermediate container and the third intermediate container, and the connection of the second intermediate container and the third intermediate container to the third pump and the fourth pump, respectively, please refer to the construction of the first intermediate container in the liquid permeability measuring system, and the connection to the second pump.
The barite drilling fluid injection system 3 and the barite blocking remover injection system 4 can be respectively connected with the second end 1012 of the holder 101 through pipelines, or as shown in fig. 1, the liquid outlet ends of the two can be converged on a main pipeline connected with the second end 1012 of the holder 101, and are respectively controlled by a liquid outlet valve V to be communicated with the holder 101.
In the actual drilling process and the reservoir blockage removing process, the barite drilling fluid damages the reservoir in a reciprocating circulation mode, and the barite blockage removing agent also removes the damaged reservoir in a reciprocating circulation mode. In order to enable the performance evaluation device for the barite blocking remover provided by the invention to reflect the actual drilling process and the reservoir blocking removal process more truly, as an improved connection mode of the barite drilling fluid injection system, the barite blocking remover injection system and the second end of the holder, the liquid outlet end of the second intermediate container 301, the liquid outlet end of the third intermediate container 401 and the connecting pipeline of the second end 1012 of the holder 101 form a closed loop.
As a further improved connection of the barite drilling fluid injection system, the barite deblocking agent injection system and the second end of the gripper, a rotary pump 6 is arranged on a connection line between the liquid outlet end of the second intermediate container 301 and the liquid outlet end of the third intermediate container 401 of the closed loop. The rotary pump is used for carrying out reciprocating circulation operation to block and damage or block the reservoir stratum.
In practical applications, the rotary pump may be a gear pump.
Valves V are respectively provided at both ends of the rotary pump 6 on the lines connecting the liquid outlet end of the second intermediate container 301 and the liquid outlet end of the third intermediate container 401 with the rotary pump 6. The technical personnel in the field realize reciprocating circulation blocking injury or reciprocating circulation unblocking to the rock core by controlling the two valves, or unidirectionally block injury or unblocking to the rock core.
The person skilled in the art can know the volume flow of the barite drilling fluid flowing through the rock core and the pressure of the second end of the holder by setting the third pump to be in a constant-flow mode, and can also know the volume flow of the barite blocking remover flowing through the rock core and the pressure of the second end of the holder by setting the fourth pump to be in a constant-flow mode.
In order to measure the volume flow of the barite blocking remover flowing through the core more accurately, a first electronic balance branch is arranged on a pipeline connecting the liquid outlet end of the first intermediate container 201 with the first end 1011 of the holder 101, and the first electronic balance branch is arranged close to the first end 1011 of the holder. The method is used for evaluating the performance of the barite drilling fluid, and within a certain period of time, the less the barite drilling fluid collected by the first electronic balance 7 is, the better the plugging performance of the barite drilling fluid on the rock core is, otherwise, the poor plugging performance is obtained. Meanwhile, the first electronic balance branch is designed to be used for discharging air in a pipeline and collecting waste liquid in the test process.
To more accurately measure the pressure at the second end 1012 of the clamp, a third pressure sensor P3 is provided in the line of the closed loop near the second end 1012 of the clamp 101.
The third pump and the fourth pump may each be a constant flow pump as is commonly used in the art.
The closed loop can be cleaned by disassembling the closed loop, and a cleaning pipeline can be arranged on the closed loop to clean the closed loop. The arrangement of the cleaning pipeline can refer to the arrangement of the cleaning pipeline in the liquid permeability measuring system, and the invention is not described herein.
When the above-described various preferred embodiments are combined and implemented, the apparatus for evaluating the performance of the barite blocking remover may be, as shown in fig. 2, an apparatus for evaluating the performance of the barite blocking remover, comprising:
the system comprises a rock core clamping system 1, a liquid permeability measuring system 2, a barite drilling fluid injection system 3, a barite blocking remover injection system 4 and a temperature control system 5;
the core clamping system 1 comprises a holder 101 capable of clamping a core, a first pump 102 connected with the holder 101 and used for applying confining pressure to the core, and a first pressure sensor P1 arranged between the first pump and the first pump;
the liquid permeability measuring system 2 comprises a first intermediate container 201 for storing liquid for measuring the permeability of the rock core, and a second pump 202 connected with the liquid inlet end of the first intermediate container 201; the liquid outlet end of the first intermediate container 201 is connected with the first end 1011 of the clamper 101; a first electronic balance branch and a second pressure sensor P2 which are arranged on a connecting pipeline between the liquid outlet end of the first intermediate container 201 and the first end 1011 of the holder 101;
the barite drilling fluid injection system 3 comprises a second intermediate container 301 for storing the barite drilling fluid, and a third pump 302 connected with the liquid inlet end of the second intermediate container 301;
the barite blocking remover injection system 4 comprises a third intermediate container 401 for storing the barite blocking remover, and a fourth pump 402 connected with the liquid inlet end of the third intermediate container 401;
the connecting pipelines of the liquid outlet end of the second intermediate container 301, the liquid outlet end of the third intermediate container 401 and the second end 1012 of the clamper 101 form a closed loop;
a third pressure sensor P3 and a second electronic balance branch are provided in the line of the closed loop near the second end 1012 of the gripper 101;
a rotary pump 6 is arranged on a connecting pipeline between the liquid outlet end of the second intermediate container 301 and the liquid outlet end of the third intermediate container 401 of the closed loop;
the temperature control system 5 is used for heating the first intermediate container 201, the second intermediate container 301, the third intermediate container 401 and the holder 101, and the lines of the first intermediate container 201, the second intermediate container 301, and the third intermediate container 401, which are connected to the holder 101, respectively.
According to the embodiment, the performance evaluation device for the barite blocking remover provided by the invention can simulate the field practical application of the barite blocking remover, and after the barite drilling fluid damages the reservoir rock core, the barite drilling fluid blocking remover is injected in the same direction to carry out corrosion and dispersion on the barite in the rock core, so that the performance evaluation device is closer to the field practical application condition.
In another aspect, the present invention provides a method for evaluating the performance of the barite blocking remover by using the above apparatus, comprising the steps of:
1) putting the core into a holder 101, and starting a first pump 102 to apply confining pressure on the core;
2) starting a temperature control system 5 to measure the liquid permeability of the system 2, the barite drilling fluid injection system 3 and the liquid in the barite blocking remover injection system 4, and heating the clamp 101 to a preset temperature;
3) and starting a liquid permeability measuring system 2, testing the initial core permeability, and recording as: k0；
4) Closing the liquid permeability measuring system 2, and opening the barite drilling fluid injection system 3 to damage the rock core;
5) the barite drilling fluid injection system 3 is closed, the liquid permeability measuring system 2 is opened, and the permeability of the rock core damaged by the barite drilling fluid is tested and recorded as: k1；
6) Closing the liquid permeability measuring system 2, and opening the barite drilling fluid injection system 3 to continue to damage the rock core;
7) closing the barite drilling fluid injection system 3, opening the barite blocking remover injection system 4, and unblocking the rock core damaged by the barite drilling fluid to a preset time;
8) closing the barite blocking remover injection system 4, opening the liquid permeability measuring system 2, testing the permeability of the blocked rock core, and recording as: k2；
9) Calculating the damage rate of the rock core
And permeability recovery of the core
The device and the method for evaluating the performance of the barite blocking remover have the beneficial effects that:
(1) the performance evaluation device and the evaluation method of the barite blocking remover provided by the invention can simulate the field practical application of the barite blocking remover, and after the barite drilling fluid damages a reservoir rock core, the barite blocking remover is injected in the same direction to carry out corrosion and dispersion on barite in the rock core, so that the performance evaluation method of the barite blocking remover is closer to the field practical application condition.
(2) Comparing the permeability of the unblocked core with the initial permeability of the core, and evaluating the unblocking performance of the blocking remover on the reservoir by utilizing the damage rate of the core obtained by the ratio of the permeability after the damage of the core to the initial permeability of the core and the permeability recovery rate of the core obtained by the ratio of the permeability after the unblocking of the core to the permeability after the damage of barite, wherein the evaluation result is more intuitive and reliable;
(3) the indoor evaluation of the plugging removal performance of different reservoir types, different barite drilling fluid types, different slave spar plugging removal agents types and different usage amounts can be completed, the evaluation of the barite plugging removal agents is more specific and comprehensive, and effective guidance is provided for the type optimization, the usage amount optimization and the like of the barite plugging removal agents applied on site.
Example 1
As shown in fig. 2, the blocking removal performance of the barite blocking remover after the reservoir of the oil well is damaged by the barite drilling fluid is simulated and evaluated. Wherein, the diameter of the core is 25.4-50.8 mm, and the length is 30-100 mm.
(1) Connecting an experimental process, namely sleeving a core with an annular rubber sleeve, and putting the core into a core holder, wherein the right end of the core is required to be completely parallel to the right end of the core holder so as to simulate the contact damage process of barite drilling fluid and a reservoir, as shown in fig. 2, after the core is placed, opening a first valve V1, applying confining pressure to the core in the holder 101 by a first pump 102, reading the pressure of a first pressure sensor P1 as confining pressure, and in the process of circulating damage of the barite drilling fluid, the pressure in the injection process of the barite blocking remover is 1.5-2 MPa higher than that in the process of circulating damage of the barite drilling fluid;
(2) heating the holder 101 by using a temperature control system 5 until the temperature of the core reservoir is reached;
(3) opening a second valve V2 and a third valve V3 (a second electronic balance 8 is used for collecting waste liquid), pushing a first intermediate container 201 by using a second pump 202 to inject 8% potassium chloride solution into the core, reading pressure values of a second pressure sensor P2 and a third pressure sensor P3 after the flow rate of the 8% potassium chloride solution in the device is stable, and testing the initial permeability of the core according to the Darcy formula, wherein the initial permeability is marked as K0；
Wherein, K0-core fluid permeability, mD;
a-core Cross-sectional area, cm2；
L is the length of the core, cm;
P2-core left end pressure, MPa;
P3-pressure at right end of core, MPa;
flow of Q-8% solution of potassium chloride in cm3/s；
Viscosity of a solution of mu-8% potassium chloride, mPas.
(4) Closing the second valve V2 and the third valve V3, opening the fifth valve V5, the sixth valve V6 and the seventh valve V7, injecting the barite drilling fluid in the second intermediate container 201 into a closed loop by using a third pump 302, filling the closed loop with the barite drilling fluid, wherein the pressure in a pipeline is lower than the confining pressure by 1.5-2 MPa, and opening the fourth valve V4 to prepare for collecting waste liquid; circulating the barite drilling fluid by using a rotary pump 6, and simulating the damage of the barite drilling fluid to a rock core in the drilling process; cleaning the pipeline after the injury is finished;
(5) opening a second valve V2 and a third valve V3, closing a fourth valve V4, a fifth valve V5, a sixth valve V6 and a seventh valve V7, reading pressure values of a second pressure sensor P2 and a third pressure sensor P3 and mass change of a second electronic balance 8 in a certain time after the flow rate of 8% KCl solution in a pipeline is stable, and testing the permeability of the rock core after the rock core is damaged by the barite drilling fluid, wherein the permeability is K1；
(6) The second valve V2 and the third valve V3 are closed again, the fourth valve V4, the fifth valve V5, the sixth valve V6 and the seventh valve V7 are opened, and the damage of barite drilling fluid to the rock core in the drilling process is simulated again; cleaning the pipeline after the injury is finished;
(7) opening a fourth valve V4, a sixth valve V6, a seventh valve V7 and an eighth valve V8, closing a fifth valve V5, pushing a third intermediate container 401 by a fourth pump 402 to inject a barite blocking remover according to the design injection amount of an experimental scheme, for example, 2-3 times of the core void volume is injected into a core according to the damage direction of the barite drilling fluid, circulating the barite drilling fluid by using a rotary pump 6, fully corroding and dispersing the barite drilling fluid, and fully reacting for 3-8 hours; simulating a barite blocking remover to block the damaged rock core; after the blockage removal is finished, cleaning the pipeline;
(8) opening a second valve V2 and a third valve V3, closing and opening a fourth valve V4, a sixth valve V6, a seventh valve V7 and an eighth valve V8, reading the pressure values of a second pressure sensor P2 and a third pressure sensor P3 and the mass change of a second electronic balance 8 in a certain time after the flow rate of 8% KCl solution in the pipeline is stable, and testing the permeability of the core after the blockage is removed, namely K2；
(9) Calculating the damage rate of the rock core
And permeability of the coreRate of recovery of transmittance
The flow rate of the 8% potassium chloride solution is a ratio of a change in mass of the 8% potassium chloride solution collected by the second electronic balance per unit time to the density thereof.
The confining pressure of the core is 1.5-2 MPa higher than the pressure at two ends of the core, so that liquid flowing through the core can flow out from two ends (left end or right end) of the core, and cannot flow out from the side face parallel to the axial direction of the core.
And (3) analyzing data results: if KDMore than 100%, the permeability of the rock core under scouring after being deblocked by using the barite deblocking agent is larger than the permeability of the rock core under only scouring, the permeability of the rock core is increased under the action of the dissolution of the barite drilling fluid deblocking agent, and the barite deblocking agent can effectively increase the permeability of a reservoir; if KDLess than 100%, it shows that the permeability of the core under reverse scouring after the core is deblocked by using the barite drilling fluid deblocking agent is less than the permeability recovery of the core under only scouring, the permeability of the core is reduced under the action of the dissolution of the barite drilling fluid deblocking agent, and the barite deblocking agent cannot effectively increase the permeability of the reservoir and is harmful to the reservoir.
KInjury due to woundCan be used for indicating the damage degree of the barite drilling fluid to the core.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The device for evaluating the performance of the barite blocking remover is characterized by comprising the following components:
the device comprises a rock core clamping system (1), a liquid permeability measuring system (2), a barite drilling fluid injection system (3), a barite blocking remover injection system (4) and a temperature control system (5);
the core clamping system (1) comprises a holder (101) capable of holding a core, and a first pump (102) connected with the holder (101) and used for applying confining pressure on the core;
the liquid permeability measuring system (2) is connected with the first end (1011) of the holder (101), and the liquid permeability measuring system (2) comprises a first intermediate container (201) for storing liquid for testing the permeability of the rock core and a second pump (202) connected with the liquid inlet end of the first intermediate container (201); the liquid outlet end of the first intermediate container (201) is connected with the first end (1011) of the clamp holder (101);
the first intermediate container (201) is provided with a first chamber (2011) and a second chamber (2012) controlled by a piston, the first chamber (2011) is communicated with the second pump (202), the second pump (202) is configured to suck water from a water tank and inject the water into the first chamber (2011), and liquid in the second chamber (2012) is pushed into the core holding system (1);
the barite drilling fluid injection system (3) is connected with the second end (1012) of the holder (101);
the barite blocking agent injection system (4) is connected with the second end (1012) of the clamper (101);
the temperature control system (5) is used for heating the liquid measuring permeability system (2), the barite drilling fluid injection system (3) and the liquid in the barite blocking agent injection system (4), and the clamp holder (101).
2. The barite blocking agent performance evaluation device according to claim 1, wherein the barite drilling fluid injection system (3) comprises a second intermediate container (301) for storing barite drilling fluid, and a third pump (302) connected with a liquid inlet end of the second intermediate container (301); the outlet end of the second intermediate container (301) is connected to the second end (1012) of the gripper (101).
3. The device for evaluating the performance of the barite blocking agent according to claim 2, wherein the barite blocking agent injection system (4) comprises a third intermediate container (401) for storing the barite blocking agent, and a fourth pump (402) connected with a liquid inlet end of the third intermediate container (401); the outlet end of the third intermediate container (401) is connected with the second end (1012) of the clamper (101).
4. The apparatus for evaluating the performance of the barite blocking agent according to claim 3, wherein the connecting lines of the liquid outlet end of the second intermediate container (301), the liquid outlet end of the third intermediate container (401) and the second end (1012) of the clamper (101) form a closed loop.
5. The apparatus for evaluating the performance of the barite blocking agent according to claim 4, wherein a rotary pump (6) is arranged on a connecting line between the liquid outlet end of the second intermediate container (301) and the liquid outlet end of the third intermediate container (401) of the closed loop.
6. The apparatus for evaluating the performance of the barite blocking agent according to claim 4 or 5, wherein a first pressure sensor (P1) is arranged on a connecting line of the clamper (101) and the first pump (102).
7. The apparatus for evaluating the performance of the barite blocking agent according to claim 6, wherein a liquid outlet end of the first intermediate container (201) is connected with a first end (1011) of the clamper (101), and a second pressure sensor (P2) is arranged on a pipeline close to the first end (1011) of the clamper (101).
8. The apparatus for evaluating the performance of the barite blocking agent according to claim 7, wherein a third pressure sensor (P3) is arranged on a pipeline of the closed loop near the second end (1012) of the clamper (101).
9. The device for evaluating the performance of the barite blocking remover according to claim 8, wherein a first electronic balance branch is arranged on a pipeline connecting the liquid outlet end of the first intermediate container (201) with the first end (1011) of the holder (101); a second electronic balance branch is arranged on a pipeline of the closed loop close to the second end (1012) of the gripper (101).
10. A method for evaluating the performance of a barite blocking agent using the apparatus of claim 1, comprising the steps of:
1) putting a core into the holder (101), and starting a first pump (102) to apply confining pressure on the core;
2) starting a temperature control system (5) to measure the permeability of the liquid, wherein the barite drilling fluid injection system (3) and the liquid in the barite blocking remover injection system (4) are injected into the liquid, and the clamp holder (101) is heated to a preset temperature;
3) and starting the liquid permeability measuring system (2), testing the initial core permeability, and recording as: k0；
4) Closing the liquid permeability measuring system (2), and opening the barite drilling fluid injection system (3) to damage the rock core;
5) closing the barite drilling fluid injection system (3), opening the liquid permeability measuring system (2), testing the permeability of the rock core damaged by the barite drilling fluid, and recording as: k1；
6) Closing the liquid permeability measuring system (2), opening the barite drilling fluid injection system (3) and continuing to damage the rock core;
7) closing the barite drilling fluid injection system (3), opening the barite blocking remover injection system (4), and unblocking the rock core damaged by the barite drilling fluid until the preset time;
8) closing the barite blocking remover injection system (4), opening the liquid permeability measuring system (2), testing the permeability of the blocked rock core, and recording as: k2；
9) Calculating the damage rate of the rock core
And permeability recovery of the core
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| CN111380826B (en) * | 2018-12-27 | 2022-12-02 | 中国石油天然气股份有限公司 | Method and device for detecting drilling fluid performance |
| CN112858130A (en) * | 2019-11-27 | 2021-05-28 | 中国石油天然气股份有限公司 | Device and method for measuring damage rate of temporary plugging agent to reservoir permeability |
| CN111929402B (en) * | 2020-08-12 | 2022-03-25 | 西南石油大学 | Open type experimental device and method for simulating single-section plug unblocking technological process |
| CN111912732B (en) * | 2020-08-12 | 2022-04-29 | 成都派倬石油科技有限公司 | Open type experimental device and method for simulating multi-slug plug removal process |
| CN112525793A (en) * | 2020-11-05 | 2021-03-19 | 中国林业科学研究院木材工业研究所 | Wood liquid permeability analysis and test method |
| CN114113174B (en) * | 2021-12-17 | 2023-11-03 | 西南石油大学 | Sulfur deposition rock sample sulfur dissolving agent blocking removal effect testing device and method based on X-rays |
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