CN114907826B - A kind of targeting deep regulating and displacing agent and its preparation method and application - Google Patents

Abstract

The invention belongs to the related field of water plugging and water control technology for oil-water wells, and in particular relates to a targeted deep-seated flood control agent and its preparation method and application. The preparation method includes the following steps: S1, adding the gel carrier into water and stirring until fully dissolved without flocs to obtain liquid A; adding time control factors into the thermosetting polymer at room temperature and stirring until fully dissolved without flocs to obtain liquid B; S2 1. At room temperature, add the liquid B obtained from S1 into the liquid A obtained from S1 under stirring state, and mix evenly to obtain the targeted deep-seated flood control agent. The controllable flooding agent prepared by the present invention is a phase change solidification controllable multi-scale plugging system. The formation temperature is tested to adjust the content of some components in the system, so as to realize the regulation of the phase change time factor of the emulsion, so as to precisely control the plugging agent in the formation design. Position solidification to achieve the purpose of targeted regulation and drive.

Description

A kind of targeted deep regulating and displacing agent and its preparation method and application

technical field

The invention belongs to the related field of oil-water well water plugging and water control technology, and in particular relates to a targeted deep-seated flood control agent and its preparation method and application.

Background technique

Once the dominant channel is formed in the process of water flooding, the water content is greater than 70%, repeated washing, the remaining oil cannot be recovered, resulting in a lot of waste of resources. Its water flooding development, as the main means of enhancing the recovery of oil reservoirs, has an extremely wide range of applications. Water flooding efficiency of water injection development reservoir = swept volume EV × oil washing efficiency ED, profile control is to improve the swept volume of interlayer water absorption profile in a balanced manner, profile control is to increase the swept volume in the injected water layer, and water shutoff is to block the dominant channel. In order to improve oil displacement efficiency, in recent years, commonly used profile control and water shutoff technologies at home and abroad include technical systems such as jelly, water-swelling body, and polymer microspheres; jelly is cross-linked underground, so it is affected by conditions such as formation temperature and prepared water. , especially affected by formation pore shear, the viscosity loss is obvious, the effective period of profile control is short, and it is easy to form continuous blockage, resulting in a large increase in water injection pressure or no water injection; Water swells and tends to accumulate near the wellbore, resulting in rapid wellbore pressure increase, blockage near the wellbore, and failure to reach the far end of the formation.

It can be seen that in the integration of flooding and flooding, factors such as formation fluid salinity, temperature and pH value affect the flooding agent, leading to uncertainty in the effect of flooding. For this reason, the present invention controls the solidification of the control and displacement agent at the designed position of the formation by regulating the phase transition time of the emulsion, thereby realizing targeted deep control and displacement, and improving the certainty of the control and displacement effect.

Contents of the invention

In order to solve the above-mentioned problems, the present invention provides a targeted deep-seated flood control agent and its preparation method and application. The phase-change solidification controllable multi-scale plugging system is carried by the gel carrier, and the temperature of the formation is tested to adjust the composition of some components in the system. content, to realize the regulation of the phase change time factor of the emulsion, so as to precisely control the solidification of the plugging agent at the designed position of the formation, and realize the purpose of targeted control and flooding.

The present invention solves the above-mentioned technical problems through the following technical solutions.

The present invention provides a kind of preparation method of targeting deep regulating and displacing agent, comprises the following steps:

S1. Add the gel carrier into water and stir until fully dissolved without flocs to obtain liquid A; add the phase change control factor into the thermosetting polymer at room temperature and stir until fully dissolved without flocs to obtain liquid B;

S2. Obtain liquid B; add the liquid B obtained in S1 to the liquid A obtained in S1 under stirring at room temperature, and mix evenly to obtain a targeted deep-seated regulating and displacing agent.

Preferably, in S1, the gel carrier is polyacrylamide and/or xanthan gum;

Preferably, in S1, the mass ratio of the gel carrier to water is 1-3:100, and the stirring rate is 3000-5000r/min.

Preferably, in S1, the phase transition control factor is one or more of diethylaminopropylamine, boron trifluoride-monoethylamine, and m-phenylenediamine.

Preferably, in S1, the thermosetting polymer is one or more of bisphenol A epoxy resin, polyphenol glycidyl ether epoxy resin, and novolac epoxy resin.

Preferably, in S1, the mass ratio of the time control factor to the thermosetting polymer is 1-15:100, and the stirring rate is 3000-5000r/min.

Preferably, in S2, the mass ratio of the liquid A to the liquid B is 100:1-5, and the stirring speed is 4000-6000r/min.

The invention provides the targeted deep water regulation and displacement agent prepared by the above preparation method.

The present invention also provides the application of the above-mentioned targeted deep control and displacement agent in low-permeability oil field water plugging operations, including the following steps:

Step 1. Calculate the phase transition temperature of the control and displacement agent: get the phase transition temperature according to the well depth of the oil-water well where the control and displacement agent reaches, and the phase transition temperature is geothermal gradient × well depth;

Step 2. Calculate the phase change time of the control and displacement agent: the longitudinal phase change time is obtained according to the injection displacement and the unit volume of the injection tubing, and the vertical phase change time is the injection displacement/unit volume; according to the depth of the reservoir and the injected liquid in the formation The seepage velocity of the horizontal phase transition time is obtained, and the lateral phase transition time is the depth/seepage velocity of the reservoir; the phase transition time is the sum of the vertical phase transition time and the transverse phase transition time;

Step 3. Determine the dosage of the phase change control factor: obtain the component ratio of the phase change control factor in the flood control agent emulsion according to the phase transition temperature and phase transition time, and prepare the flood control agent emulsion;

Step 4. Targeted injection: Target injection of the flood control agent emulsion at the injection pressure and injection displacement set above. When the flood control agent emulsion reaches the position, the carrier is gradually hydrated, and the phase change control factor and thermosetting polymer The polymerization reaction solidifies, so as to precisely control the solidification of the plugging agent at the designed position of the formation.

Preferably, the use temperature of the targeted deep-displacement agent is 20-160° C., and the curing time is 4-400 hours.

Compared with the prior art, the present invention has the following beneficial effects:

(1) The present invention provides a targeted deep-seated flood control agent, which carries a phase-change solidification controllable multi-scale plugging system through the gel carrier, and tests the formation temperature to adjust the content of some components in the system to realize the control of the phase change time factor of the emulsion control, so as to accurately control the solidification of the plugging agent at the designed position of the formation, and achieve the purpose of targeted control and flooding.

(2) The present invention is injected through the ground of the regulating and displacing agent liquid, and the viscosity before solidification is 5-100mPa·s, and it is easy to inject, and the system does not contain any particulate matter, and is only affected by formation temperature, and is not affected by underground fluid salinity and Influenced by factors such as the pH value, the time control factor is affected by the formation temperature and polymerizes with the thermosetting polymer. After the phase transition, the strength is high, the steering ability is strong, and the phase transition time is adjustable. ), the control and displacement agent can migrate in the formation for more than 15 days, and can realize deep control and displacement, with stable performance and wide adaptability.

(3) When the present invention provides targeted deep-seated control and flooding agent, when the carrier is hydrated, the targeted plugging agent changes from a liquid phase to a solid phase, forming particles of a discontinuous phase, which are granulated and consolidated, distributed in a scattered form, and do not It will form a continuous blockage, block the dominant channel, block water but not oil, block but not die.

(4) The present invention provides a targeted deep-seated control and drive agent with good environmental tolerance, insoluble in water and oil, not affected by formation water dilution and salinity, has a good selective plugging effect, and can completely reach Plugging the set position does not affect the consolidation strength of the control and drive agent. After curing, it is resistant to strong acids and alkalis, H ₂ S, and CO ₂ corrosion at high temperatures. It has a long validity period, is not easy to degrade, and has low construction costs. Low concentration and large dosage .

Description of drawings

Fig. 1 is the figure of influence on the thickening of the regulating and displacing agent of embodiment 1 under the change of pH of the present invention;

Fig. 2 is the figure of influence of the salinity of the present invention on the performance of the regulating and displacing agent of embodiment 1;

Fig. 3 is the thickening curve of the control and drive agent in Example 1-3 at a temperature of 50°C according to the present invention;

Fig. 4 is the thickening curve of the flood control agent in Example 1-3 in the present invention at a temperature of 80°C;

Fig. 5 is a thickening curve of the flood control agent in Example 1-3 in the present invention at a temperature of 130°C;

Fig. 6 is the water plugging effect diagram of the simulated oil well of the control and displacement agent in Example 1 of the present invention;

Fig. 7 is a curve diagram of the water shutoff curve of the control and flooding agent in Example 1 of the present invention to the formation with a permeability of 353mD and a water content of 70%;

Fig. 8 is a graph of water shutoff curves for the formation water plugging agent with a permeability of 387mD and a water content of 80% in Example 1 of the present invention;

Fig. 9 is a graph of water shutoff curves of the control and flooding agent in Example 1 of the present invention for formations with a permeability of 492mD and a water content of 90%.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that the technical terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the protection scope of the present invention. Unless otherwise specified, each of the terms used in the following embodiments of the present invention All raw materials, reagents, instruments and equipment can be purchased from the market or prepared by existing methods.

Example 1

A method for preparing a targeted deep-seating agent, comprising the following steps:

S1. Add 3g of polyacrylamide to 100g of water and stir at a speed of 3000r/min until fully dissolved without flocs to obtain liquid A for use; add 15g of time-controlling factor diethylaminopropylamine to 100g of bisphenol A type at room temperature Stir in the epoxy resin at a speed of 3000r/min until fully dissolved without flocs, and obtain liquid B for use;

S2. At room temperature, add 5 g of the B solution obtained from S1 to 100 g of the A solution obtained from S1 under stirring at a speed of 6,000 r/min, and mix evenly to obtain a targeted deep-displacement agent.

Example 2

A method for preparing a targeted deep-seating agent, comprising the following steps:

S1. Add 1g of polyacrylamide and 1g of xanthan gum into 100g of water and stir at a speed of 4000r/min until fully dissolved without flocs to obtain liquid A for use;

At room temperature, add 10g of boron trifluoride-monoethylamine into 50g of bisphenol A type epoxy resin and 50g of polyphenol type glycidyl ether epoxy resin mixture and stir at a speed of 4000r/min until fully dissolved without flocculation Thickness, obtain B liquid, stand-by;

S2. At room temperature, add 3g of the B solution obtained from S1 to 100g of the A solution obtained from S1 while stirring at a speed of 5000r/min, and mix evenly to obtain a targeted deep-displacement agent.

Example 3

A method for preparing a targeted deep-seating agent, comprising the following steps:

S1. Add 1.5g of polyacrylamide and 1.5g of xanthan gum into 100g of water and stir at a speed of 5000r/min until fully dissolved without flocs to obtain liquid A for use;

At room temperature, the time control factor 5g diethylaminopropylamine diethylaminopropylamine and 5g boron trifluoride-monoethylamine were added to 50g bisphenol A type epoxy resin and 50g polyphenol type glycidyl ether epoxy resin mixture in Stir at a speed of 5000r/min until fully dissolved without flocs to obtain liquid B, which is ready for use;

S2. At room temperature, add 5 g of the B solution obtained from S1 to 100 g of the A solution obtained from S1 under stirring at a speed of 6,000 r/min, and mix evenly to obtain a targeted deep-displacement agent.

Example 4

A method for preparing a targeted deep-seating agent, comprising the following steps:

S1. Add 2g of xanthan gum into 100g of water and stir at a speed of 3000r/min until fully dissolved without flocs to obtain liquid A for use;

At room temperature, add 8 g of time-controlling factor m-phenylenediamine into 100 g of polyphenol glycidyl ether epoxy resin and stir at a speed of 3000 r/min until fully dissolved without flocs to obtain liquid B for use;

S2. At room temperature, add 2g of the B solution obtained from S1 to 100g of the A solution obtained from S1 under stirring at a speed of 4000r/min, and mix evenly to obtain a targeted deep-seated flood control agent.

Example 5

A method for preparing a targeted deep-seating agent, comprising the following steps:

S1. Add 1g of polyacrylamide into 100g of water and stir at a speed of 3000r/min until fully dissolved without flocs to obtain liquid A for use;

At room temperature, add 15g of time-controlling factor boron trifluoride-monoethylamine into 50g of bisphenol A epoxy resin and more than 50g of phenolic glycidyl ether epoxy resin mixture and stir at a speed of 3000r/min until fully dissolved without flocs material, to obtain B liquid, stand-by;

S2. At room temperature, add 1g of the B solution obtained from S1 to 100g of the A solution obtained from S1 while stirring at a speed of 6000r/min, and mix evenly to obtain a targeted deep-displacement agent.

Example 6

A method for preparing a targeted deep-seating agent, comprising the following steps:

S1. Add 2g of polyacrylamide and 1g of xanthan gum into 100g of water and stir at a speed of 3000r/min until fully dissolved without flocs to obtain liquid A for use;

Add the time control factor 4g boron trifluoride-monoethylamine and 6g m-phenylenediamine into 100g polyphenol glycidyl ether epoxy resin at room temperature and stir at a speed of 3000r/min until fully dissolved without flocs to obtain B liquid, ready to use;

S2. At room temperature, add 2.5g of the B solution obtained from S1 to 100g of the A solution obtained from S1 while stirring at a speed of 6000r/min, and mix evenly to obtain a targeted deep-seating agent.

The targeted deep water-displacing agent prepared in Example 1 was tested at 80°C with a phase change time of 8 hours, and measured its consistency change with an OWC-2250 normal pressure thickener at different pH values of 1, 6 and 13. The test results are shown in the figure 1. It can be seen from Fig. 1 that the thickening curves of the targeted deep-distance control and displacement agent prepared in Example 1 basically overlap at three different pH values, from which it can be seen that the acid-base effect on the solidification time of the targeted deep-distance control and displacement agent is basically the same. No effect.

With the targeted deep regulating and displacing agent prepared in Example 1, the sodium chloride content is respectively 30000mg/L, 60000mg/L, 90000mg/L, 120000mg/L, 150000mg/L, and the calcium ion and magnesium ion are respectively 5000mg/L. The samples were placed in a constant temperature box at 80°C, and the solidification of the control and drive agent was observed. The test results are shown in Figure 2. It can be seen from Fig. 2 that salinity has basically no effect on the solidification of the targeted deep-seated flood control agent.

To simulate the temperature of the Jurassic formation wells in Changqing, place the targeted deep control and displacement agents prepared in Examples 1-3 in a constant temperature box at 50°C, 80°C and 130°C respectively, and observe the solidification time, as shown in Figure 3 -5 shown.

It can be seen from Fig. 3 that under the condition of 50°C, the initial setting time of the targeted deep-seating agent prepared in Example 1 was 312h (13d), and the complete curing time was 504h (21d); the targeted deep-seated agent prepared in Example 2 The initial setting time of the regulating and displacing agent is 200h (8.3d), and the complete curing time is 352h (14.6d); the initial setting time of the targeted deep regulating and displacing agent prepared in Example 3 is 160h (6.7d), and the complete curing time is 288h ( 12d).

It can be seen from Figure 4 that under the condition of 80°C, the initial setting time of the targeted deep water control agent prepared in Example 1 was 160h (6.7d), and the complete curing time was 350h (14.5d); The initial setting time of the deep regulating and displacing agent is 88h (3.7d), and the complete curing time is 260h (10.8d); the initial setting time of the targeted deep regulating and displacing agent prepared in Example 3 is 67h (2.8d), and the complete curing time is 190h (7.9d).

It can be seen from Figure 5 that under the condition of 130°C, the initial setting time of the targeted deep control and flooding agent prepared in Example 1 was 136h (5.7d), and the complete curing time was 192h (8d); The initial setting time of the deep control and drive agent is 230h (9.6d), and the complete curing time is 288h (12d); the initial setting time of the targeted deep control and drive agent prepared in Example 3 is 330h (13.75d), and the complete curing time is 408h ( 17d).

Add quartz sand (20-40 mesh) into the U-shaped tube to form a simulated sand-packed formation, then flood the simulated water-flooded well with water, and squeeze the targeted deep-seating agent prepared in Example 1 to simulate a well temperature of 80°C and place it at a constant temperature In the box, observe the water blocking effect after 10h of phase transition, and the results are shown in Figure 6. It can be seen from Figure 6 that after the targeted deep water-displacement agent prepared in Example 1 is plugged, a complete water-resisting layer is formed, and the plugging effect is remarkable.

The targeted deep control and displacement agent prepared in Example 1 is used to simulate formations with different permeability from low to high with sand filling tubes, and 0.3 PV of the targeted deep control and displacement agent prepared in Example 1 is added to the sand filling tube, and wait until completely Test its plugging effect after curing, as shown in Figure 7-9 and Table 1.

It can be seen from Fig. 7 and Table 1 that when the recovery rate rises to 64.38% during primary water flooding, the water content at the outlet reaches 70%. After curing and aging, carry out secondary water flooding. During secondary water flooding, oil flow appeared in the outlet section after the injection pressure increased and the oil flow appeared in the outlet section, the recovery rate increased from 64.38% to 81.48% and then stabilized, and the recovery rate increased by 17.1%; and When the control and flooding agent is broken through, the water content of the produced fluid drops to about 30% at most, and the water content rises again as the displacement progresses. From the results, the control and flooding agent has a good effect of reducing water and increasing oil for the formation with a permeability of 353mD and a water content of 70%.

It can be seen from Fig. 8 and Table 1 that when the recovery rate rises to 66.3% during primary water flooding, the water cut at the outlet reaches 80%. After curing and aging, carry out secondary water flooding. During secondary water flooding, oil flow appeared in the outlet section after the injection pressure increased and the oil flow occurred in the outlet section, the recovery rate increased from 66.3% to 85.58% and then stabilized, and the recovery rate increased by 19.28%; and When the control and flooding agent is broken through, the water content of the produced fluid drops to about 26% at the most, and the water content rises again as the displacement progresses. From the results, it can be seen that the control and flooding agent has a good effect of reducing water and increasing oil for the formation with a permeability of 387mD and a water content of 80%.

It can be seen from Fig. 9 and Table 1 that when the recovery rate increases to 75.48% during primary water flooding, the water content at the outlet reaches 90%. After curing and aging, carry out secondary water flooding. During the secondary water flooding, oil flow appeared in the outlet section after the injection pressure increased and the oil flow increased from 75.48% to 88.53%, and then stabilized, and the recovery increased by 13.05%; and When the control and flooding agent is broken through, the water content of the produced fluid drops to about 28% at the most, and the water content rises again as the displacement progresses. From the results, the control and flooding agent has a good effect of reducing water and increasing oil for the formation with a permeability of 492mD and a water content of 90%.

Table 1 Water plugging experiment results under different water content

It should be noted that when the present invention involves a numerical range, it should be understood that the two endpoints of each numerical range and any value between the two endpoints can be selected. Since the steps and methods adopted are the same as those in the embodiments, in order to avoid repeating , the invention describes preferred embodiments. While preferred embodiments of the present invention have been described, additional changes and modifications can be made to these embodiments by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (6)

1. A preparation method for targeting deep regulating and displacing agent, is characterized in that, comprises the following steps: S1. Add the gel carrier into water and stir until fully dissolved without flocs to obtain liquid A; add the phase change control factor into the thermosetting polymer at room temperature and stir until fully dissolved without flocs to obtain liquid B; The phase change control factor is one or both of diethylaminopropylamine, boron trifluoride-monoethylamine; The gel carrier is polyacrylamide and/or xanthan gum; The thermosetting polymer is one or more of bisphenol A type epoxy resin, polyphenol type glycidyl ether epoxy resin, novolac type epoxy resin; The mass ratio of the gel carrier to water is 1-3:100; The mass ratio of the phase change control factor to the thermosetting polymer is 1-15:100; S2. Add the B solution obtained from S1 to the A solution obtained from S1 under stirring at room temperature, and then mix evenly to obtain a targeted deep-seated flood control agent; The mass ratio of the A liquid to the B liquid is 100:1-5. 2. The preparation method of the targeted deep-seating control and displacement agent according to claim 1, characterized in that, in S1, the stirring rate is 3000-5000r/min. 3. The preparation method of the targeted deep-seated control and drive agent according to claim 1, characterized in that, in S2, the stirring rate is 4000-6000r/min. 4. A targeted deep-seated regulating and displacing agent prepared according to the preparation method according to any one of claims 1-3. 5. the application of the targeted deep control and displacement agent according to claim 4 in the water plugging operation of low permeability oilfield, is characterized in that, comprises the following steps: Step 1. Calculate the phase transition temperature of the control and displacement agent: get the phase transition temperature according to the well depth of the oil-water well where the control and displacement agent reaches, and the phase transition temperature is geothermal gradient × well depth; Step 2. Calculate the phase change time of the control and displacement agent: the longitudinal phase change time is obtained according to the injection displacement and the unit volume of the injection tubing, and the vertical phase change time is the injection displacement/unit volume; according to the depth of the reservoir and the injected liquid in the formation The seepage velocity of the horizontal phase transition time is obtained, and the lateral phase transition time is the depth/seepage velocity of the reservoir; the phase transition time is the sum of the vertical phase transition time and the transverse phase transition time; Step 3. Determine the dosage of the phase change control factor: obtain the component ratio of the phase change control factor in the flood control agent emulsion according to the phase transition temperature and phase transition time, and prepare the flood control agent emulsion; Step 4. Targeted injection: Target injection of the flood control agent emulsion at the injection pressure and injection displacement set above. When the flood control agent emulsion reaches the position, the carrier is gradually hydrated, and the phase change control factor and thermosetting polymer The polymerization reaction solidifies, so as to precisely control the solidification of the plugging agent at the designed position of the formation. 6 . The application according to claim 5 , characterized in that, the use temperature of the targeted deep-displacement agent is 20-160° C., and the curing time is 4-400 hours.