CN112878976B - A bolus injection system and application method of remote control temporary plugging material - Google Patents

Abstract

The invention discloses a remote control temporary plugging material injection system and an application method thereof. The remote control temporary plugging material injection device comprises a temporary plugging agent injection system, a temporary plugging agent storage system and a pressure packing system, and is mainly used for injecting a temporary plugging agent and a temporary plugging ball into a high-pressure manifold, so that the temporary plugging agent is prevented from entering the manifold smoothly due to the fact that the gravity of the temporary plugging agent is not enough to overcome resistance. The device adopts remote control operation, and controls the temporary plugging agent injection system and the switch pressure packing system by means of the electric control hydraulic power, thereby avoiding that constructors penetrate high pressure areas to ensure the safety of field constructors and avoiding possible high pressure puncture injuries. The temporary plugging agent and temporary plugging ball for blastholes are filled into the high-pressure manifold without stopping the pump, and the continuity of temporary plugging fracturing construction operation is greatly improved; the construction time is shortened, and the construction cost is reduced.

Description

A bolus injection system and application method of remote control temporary plugging material

technical field

The invention belongs to the technical field of oil and gas field fracturing reservoir reconstruction and oil and gas stimulation, and in particular relates to a remote-controlling temporary plugging agent push injection device.

Background technique

With the depletion of conventional oil and gas resources, unconventional oil and gas resources such as shale gas and tight sandstone gas have gradually become the key areas of exploration and development. Due to the diversity and complexity of geological structure in unconventional reservoirs, strong heterogeneity and large difference in formation cracking pressure, in multi-cluster fracturing process, it is difficult to achieve effective opening of the whole cluster, and some perforation clusters are not fully open. fully remodeled. Mechanical isolation tools such as bridge plugs are often used in the field. However, due to large-scale fracturing, multiple tripping tools and crustal movement, casing deformation and other problems are caused, so that the bridge plug cannot be run smoothly, and even some well sections are blocked. Forced to abandon the fracturing operation. Therefore, in order to effectively isolate the blasthole interval that has been reformed, the temporary material is injected from the fracturing wellhead under the condition of no displacement on site. The blasthole of the modified section is blocked. At present, the commonly used temporary plugging materials for blastholes are temporary plugging balls and temporary plugging agents, whose uniform structure enables them to be added from the wellhead by their own gravity.

However, the temporary plugging ball is put into the pump at the wellhead. Due to the different density and size of the temporary plugging ball, its own gravity is different, and the free settling speed in the wellbore is different. Due to the inertial effect, a particularly large acceleration will be obtained, and the instantaneous speed will be particularly large. Due to the small blast hole, the temporary blocking ball may float over the blast hole instantly, and the blast hole cannot be blocked, so the blocking fails; , Small particles, low density and low gravity, generally the dosage exceeds 100 kg each time, and the particle size is generally less than 40 mesh. It is easy to "bridge" accumulation near the wellhead when the pump is stopped at the wellhead, blocking the wellhead, so as to restart the pump to provide drainage. It is impossible to bring the temporary plugging agent into the wellbore to block the blasthole when the amount of water is met, and most of the temporary plugging agents on the market will quickly viscous and expand when exposed to water. cause great inconvenience.

Although the construction in some places is to add the temporary blocking agent slowly from the sand mixer from the sand mixer under the condition of non-operation, through manual dumping, this method can hardly be added uniformly at a certain speed due to artificial dumping, and there are fluctuations in speed and slowness. The rhythm of the sand mixer may cause the concentration of the temporary plugging agent to be too high or too low at a certain time, resulting in unstable construction pressure and causing great inconvenience to the construction. The pump head of the pump truck is boosted at high speed to accelerate and pressurize. When it flows through the wellhead and enters the wellbore, under the action of the booster of the pump head, the temporary plugging agent is heated and becomes sticky and deformed, and it is easy to adhere to the inside of the pump head, resulting in damage to the pump head. It is very disadvantageous to equipment and construction.

In addition, the prior art, such as a Chinese patent (application number: CN2019219608163, bulletin number: CN211174071U), discloses a multi-channel remote hydraulic control ball-throwing device, which includes a remote hydraulic control cabinet and four sets of parallel-arranged betting ports, the betting ports and The fracturing head is connected, and each set of betting ports is provided with an upper plug valve and a lower plug valve, and a space for accommodating the temporary blocking ball is formed between the upper plug valve and the lower plug valve. The hydraulic pipeline is connected with the remote hydraulic control cabinet. However, this patent cannot effectively isolate the liquid from backflowing into the temporary plugging material storage system, so that the temporary plugging material may become sticky and swollen in contact with water before being put into use; in addition, this patent cannot be used for temporary plugging balls and temporary plugging agents at the same time. The online injection and delivery of various temporary blocking materials cannot solve the problem of multiple delivery methods of online delivery devices in the existing market.

SUMMARY OF THE INVENTION

In order to smoothly inject the temporary plugging ball and the temporary plugging agent into the wellbore to plug the blasthole, the present invention provides a remote-controlling temporary plugging material bolus injection system, which can prevent personnel from crossing the construction zone in the high-pressure area during high-pressure construction operations, and can keep the pump running without stopping. The temporary plugging agent and the temporary plugging ball are effectively added under the conditions to ensure that the temporary plugging agent or the temporary plugging ball is successfully pushed into the wellbore to plug the blasthole. For solving the above problems, the technical scheme of the present invention is:

A remote-controlled temporary plugging material bolus system, comprising a temporary plugging material bolus injection system 8, a temporary plugging material storage system 13, and a pressure isolation system 16, is characterized by:

The temporarily plugging material bolus system 8 includes: a bolus system electric control box 1, a hydraulic unit 2, a reset sensor 3, a piston 4, a hydraulic cylinder 5, a push rod 6, and a displacement sensor 7;

The temporary plugging material storage system 13 includes a temporary plugging material storage cavity 9 , a temporary plugging material adding port 10 , a temporary plugging material storage chamber 11 , and a pressure relief valve 12 ;

The pressure isolation system 16 includes a hydraulic power valve 14 and an electric control box 15;

It is characterized in that: the electric control box 1 of the bolus injection system and the hydraulic unit 2 are connected by cables; the hydraulic unit 2 and the reset sensor 3 are connected by a thread; the reset sensor 3 and the hydraulic cylinder 5 are connected by The standard union button is connected; the piston 4 and the push rod 6 are connected with the four ports and placed in the internal space where the reset sensor 3 is connected with the hydraulic cylinder 5; the displacement sensor 7 is embedded in the hydraulic cylinder 5 through the thread ;

The openings on the temporary plugging material storage cavity 9 are connected by a screw thread to form a temporary plugging material adding port 10, and the pressure relief valve 12 is assembled by connecting it with a screw thread;

The hydraulic power valve 14 is connected with the electric control box 15 by cable.

Preferably, the push rod 6 moves up and down in the hydraulic cylinder 5 under the driving of the electronically controlled hydraulic power unit;

Preferably, the temporary plugging material is stored in the temporary plugging material storage cavity 11, and the inner diameter of the temporary plugging material storage cavity 11 can be designed to correspond to a certain storage space size according to actual needs. The piston is located at the top of the temporary blocking material storage chamber 11 , the piston can move up and down in the chamber with the push rod, and the piston and the inner wall of the chamber have good airtightness.

Preferably, the material inlet 10 for the temporary plugging material is a pressure-resistant nut plug with a diameter that can also be designed according to actual needs, and is assembled through a screw thread.

Preferably, the pressure relief valve 12 is mainly used to release the pressure in the temporary plugging agent storage chamber after closing the fracturing and isolation system after completing the bolus injection of the temporary plugging agent, so as to prepare for the next bolus injection operation Work.

Preferably, the pressure isolation system is composed of an electric control box and a hydraulic power valve, and the hydraulic power valve is directly connected to the high-pressure manifold.

Preferably, the size of each component of the remote-controlled temporary plugging material bolus system can be designed according to specific conditions such as actual use and scale of use, and the size of each component is not limited to a specific value.

The invention also discloses an application method of a bolus injection system for remote-controlled temporary plugging materials, including the above-mentioned remote-controlled temporary plugging material bolus injection system.

Beneficial effects of the present invention:

The present invention can seamlessly connect the temporary plugging materials in the middle of construction; avoid the possibility of sticking and swelling of the temporary plugging materials in contact with water before being put in; meanwhile, the temporary plugging material storage systems 13 of different space sizes are designed to be used for temporary plugging. The online injection and delivery of various temporary plugging materials such as balls and temporary plugging agents solves the problem that the existing online injection devices in the market can only be used for temporary plugging balls or a single injection of temporary plugging agents cannot meet the requirements of temporary plugging balls and temporary plugging agents at the same time. delivery issue.

Description of drawings

Fig. 1 is a schematic diagram of a remote-controlled temporary plugging material bolus system of the present invention

FIG. 2 is a side sectional view of the design structure of an application example of a remote-controlled temporary plugging material bolus system of the present invention.

Fig. 3 is the CAD structure diagram of the application example of the present invention in the reset state before the start of the bolus injection

Fig. 4 is the CAD structure diagram of the application example of the present invention before passing through the hydraulic valve during the bolus injection

Fig. 5 is the CAD structure diagram of the application example of the present invention after the push rod enters the tee and completes the bolus injection

Reference numerals include:

1—Electric control box of bolus system; 2—Hydraulic unit; 3—Reset sensor

4—Piston; 5—Hydraulic cylinder 6—Push rod

7—Push rod displacement sensor 8—Temporary plugging material injection system 9—Temporary plugging material storage cavity

10—Temporary plugging material inlet 11—Temporary plugging material storage room 12—Pressure relief valve

13—Temporary plugging material storage system 14—Hydraulic power valve 15—Electric control box; 16—Pressure isolation system.

Detailed ways

In order to have a clearer understanding of the application purpose and application effect of the present invention, the present invention will now be further described in detail with reference to the following specific embodiments. It should be noted that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

A remote-controlled temporary plugging material bolus system, comprising a temporary plugging material bolus injection system 8, a temporary plugging material storage system 13, and a pressure isolation system 16, is characterized by:

The temporarily plugging material bolus system 8 includes: a bolus system electric control box 1, a hydraulic unit 2, a reset sensor 3, a piston 4, a hydraulic cylinder 5, a push rod 6, and a displacement sensor 7;

The temporary plugging material storage system 13 includes a temporary plugging material storage cavity 9 , a temporary plugging material adding port 10 , a temporary plugging material storage chamber 11 , and a pressure relief valve 12 ;

The pressure isolation system 16 includes a hydraulic power valve 14 and an electric control box 15;

The connected state is shown in Figure 1. The temporary plugging material bolus injection system 8 is connected with the hydraulic unit 2 through the electric control box 1 of the bolus injection system through a cable. The system electric control box 1 is installed in the low-pressure safety area, so as to ensure that personnel do not enter the high-pressure area for work, and can well ensure that the device can be started without stopping the fracturing pump truck; the hydraulic unit 2 and the reset sensor 3 are connected through the thread The connection between the reset sensor 3 and the hydraulic cylinder 5 is connected by a standard union button. The specific model can be selected according to different construction pressure requirements. The principle is that it is greater than the maximum construction pressure; the piston 4 and the push rod 6 are connected through four ports, and then Then the whole is placed in the inner space where the reset sensor 3 is connected with the hydraulic cylinder 5, and the displacement sensor 7 is embedded in the hydraulic cylinder 5 through a thread, so as to be connected and assembled.

The temporary plugging material storage system 13 is formed by connecting the openings on the temporary plugging material storage cavity 9 to form the temporary plugging material adding port 10 , and at the same time the pressure relief valve 12 is connected to the temporary plugging material storage cavity 9 through a screw thread. The material can be selected according to the actual compressive strength requirements.

The pressure isolation system 16 is formed by connecting the hydraulic power valve 14 and the electric control box 15 with cables;

According to the site layout, the cable can be extended arbitrarily, and the electric control box can be moved to the low-voltage safe area to ensure that personnel do not enter the high-pressure area for work, and can well ensure that the device can be started without stopping the fracturing pump truck.

The temporary plugging material bolus system 8, the temporary plugging material storage system 13, the pressure isolation system 16, and the high-pressure manifold are all connected by standard union buckles, and their specific models can be selected according to different construction pressure requirements. The connection sequence is shown in Figure 1. The temporary plugging material bolus injection system 8 is connected to the temporary plugging material storage system 13, then connected to the pressure isolation system 16, and finally connected to the high-pressure pipe.

The temporary blocking material is placed in the storage cavity from the input port, the push rod does not enter the temporary blocking agent storage cavity, and the push rod is placed at the far right end, and the temporary storage of the temporary blocking material is completed at this time. Before the fracturing operation starts, the device is connected to the high-pressure manifold. The operation steps are as follows:

Step 1: Before the fracturing construction starts, the pressure isolation system at the end of the invented system is connected to the high pressure manifold at the wellhead through the union. In order to ensure its safety, test the operation effect under atmospheric pressure to test whether the connection is accurate and whether With the release of temporary blocking materials.

Step 2: After the test, conduct on-site pressure test to check whether the hydraulic valve of the isolation system 16 is closed, and ensure that the hydraulic valve of the pressure isolation system 16 is closed before the test; The fluid is pressurized. When the test pressure is reached, the hydraulic power valve is remotely opened to test the pressure-bearing effect of the temporarily plugged material storage cavity, the temporary plugged material addition port, and the pressure relief valve 12 to observe whether it has good sealing performance.

Step 3: After the high pressure test is completed, close the hydraulic power valve through the electric control box, open the pressure relief valve to empty the pressure and fluid in the temporary blocking material storage chamber, close the pressure relief valve after the pressure relief and fluid discharge are completed; open the temporary blocking material For the material feeding port, add the temporary plugging material into the temporary plugging material storage cavity according to the construction design, and tighten the thread of the temporary plugging material feeding port 10 to complete the filling of the temporary plugging material;

Step 4: During the fracturing construction, when the temporary plugging material needs to be added, there is no need to stop the fracturing pump truck, and there is no need to release the pressure of the high-pressure manifold. The hydraulic power valve can be directly activated. The temporary plugging material storage chamber is connected; immediately start the electric control box 1 of the bolus injection system, and push the temporary plugging material from the temporary plugging material storage chamber into the high-pressure manifold through the push rod, as shown in Figure 4, the push rod enters the temporary plugging material storage chamber Push the temporary blocking material to move into the high-pressure manifold. When the push rod stops moving, it indicates that the temporary blocking material is put in, that is, the push rod completes the total stroke. After completion, the view is shown in Figure 5. The end of the push rod moves to the tee Inside;

Step 5: After the push rod completes the total delivery stroke, the remote control bolus system resets the push rod. After the push rod is reset, it will touch the reset sensor. After receiving the reset signal, the remote console closes the hydraulic power valve and discharges it through the pressure relief valve. The pressure and liquid in the empty temporary plugging material storage cavity completes the entire temporary plugging material bolus recovery process.

The remote-controlled temporary plugging material bolus system of the present invention can effectively inject temporary plugging materials of different shapes and sizes into the high-pressure manifold through the push rod, and at the same time avoid the problem that the construction personnel pass through the high-pressure area to ensure the safety of the construction personnel on site. The electric control box of the bolus injection system in the plugging material injection system 8 can be remotely installed and started to avoid possible high-pressure puncture damage, which realizes the temporary plugging material that is injected into the high-pressure manifold by the non-stop pump, and greatly increases the temporary plugging pressure. The continuity of the construction operation is shortened, the construction time is shortened, and the construction cost is reduced; the electric control box 1 and the electric control box 15 of the bolus injection system can extend their respective connecting cables according to the actual layout of the site, and install them in the low-voltage area, which can be used in the middle of the construction. Real-time seamless connection of the temporary plugging material; the pressure isolation system 16 can effectively isolate the liquid from flowing back into the temporary plugging material storage system, avoiding the possibility of the temporary plugging material sticking and swelling in water before being put in; at the same time, different space sizes are designed The temporary plugging material storage system 13 can be used for online injection and delivery of various temporary plugging materials such as temporary plugging balls and temporary plugging agents, which solves the problem that the existing online injection devices on the market can only be used for temporary plugging balls or temporary plugging agents. A single delivery cannot meet the problem of temporary blocking ball and temporary blocking agent delivery at the same time.

The foregoing has shown and described the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions describe only the principles of the present invention. Without departing from the spirit and scope of the present invention, there are various Variations and improvements are intended to fall within the scope of the claimed invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims (3)

1. An application method of a remote control temporary plugging material injection system, wherein the remote control temporary plugging material injection system comprises: temporary stifled material injection system, temporary stifled material deposit system, pressure seal system, characterized by: the temporary plugging material injection system, the temporary plugging material storage system and the pressure packing system are sequentially connected through a union buckle and then connected with a high-pressure manifold; the temporary plugging material injection system comprises: the push injection system comprises an electric control box, a hydraulic unit, a reset sensor, a piston, a hydraulic cylinder body, a push rod and a displacement sensor; the electric control box of the injection system is connected with the hydraulic unit through a cable; the hydraulic unit is connected with the reset sensor through a screw thread; the reset sensor is connected with the hydraulic cylinder body through a standard union buckle; the piston and the push rod are connected through a screw thread and then are integrally arranged in an inner space where the reset sensor and the hydraulic cylinder body are connected; the displacement sensor is embedded into the hydraulic cylinder body through a screw thread; the temporary plugging material storage system comprises a temporary plugging material storage cavity, a temporary plugging material feeding port, a temporary plugging material storage chamber and a pressure release valve; the temporary plugging material storage cavity is provided with an opening which is connected through a screw thread to form a temporary plugging material feeding port, and the pressure release valve is connected and combined with the temporary plugging material storage cavity through the screw thread; the pressure packing system comprises a hydraulic power valve and an electric cabinet; the hydraulic power valve is connected with the electric cabinet through a cable; the temporary plugging material is stored in the temporary plugging material storage cavity, the inner diameter of the temporary plugging material storage cavity is designed to be the inner diameter corresponding to a certain storage space, a piston in the temporary plugging material injection system is positioned at the top of the temporary plugging material storage cavity, the piston moves up and down in the temporary plugging material storage cavity along with a push rod, and the tightness between the piston and the inner wall of the temporary plugging material storage cavity is good;

it is characterized in that: the method comprises the following steps:

step 1: before fracturing construction begins, connecting a pressure packing system at the tail end of the remote control temporary plugging material injection system with a wellhead high-pressure manifold through a union, and testing whether connection is accurate or not under atmospheric pressure and whether conditions for putting temporary plugging materials are met or not;

step 2: after the test is finished, carrying out on-site high-pressure test, testing the pressure bearing effect of the temporary plugging material storage cavity, the temporary plugging material feeding port and the pressure relief valve, and observing whether the temporary plugging material storage cavity, the temporary plugging material feeding port and the pressure relief valve have good sealing performance;

and step 3: after the high-pressure test is finished, adding the temporary plugging material into the temporary plugging material storage cavity according to the construction design, and tightening a screw thread at the temporary plugging material adding port to finish the temporary plugging material filling;

and 4, step 4: during the fracturing construction process, the push rod enters the temporary plugging material storage cavity to push the temporary plugging material to move into the high-pressure manifold, when the push rod stops moving, the temporary plugging material is thrown out, namely the push rod finishes the total stroke, and the tail end of the push rod moves into the union tee;

and 5: after the push rod finishes the total throw of the material, the push rod is reset by the remote control injection system, the push rod can touch the reset sensor after resetting, the hydraulic power valve is closed after the remote control console receives a reset signal, the pressure and the liquid in the temporary plugging material storage cavity are emptied through the pressure release valve, and the whole temporary plugging material injection recovery process is finished.

2. The method for applying a remote-controlled bolus system for temporarily blocking material according to claim 1, wherein: the step 2 further comprises: carrying out on-site high-pressure test, checking whether a hydraulic power valve of the pressure packing system is closed or not, and ensuring that the hydraulic power valve of the pressure packing system is in a closed state before the test; fluid in the high-pressure manifold is pressurized through the fracturing pump truck, after the testing pressure is reached, the hydraulic power valve is opened remotely, the pressure bearing effect of the temporary plugging material storage cavity, the temporary plugging material inlet and the pressure relief valve is tested, and whether good sealing performance is achieved is observed.

3. The method for applying a remote-controlled bolus system for temporarily blocking material according to claim 1, wherein: the temporary plugging material is a temporary plugging ball or a temporary plugging agent.

Images