A large - volume batch - mixing truck for cementing operations

Abstract

The present invention discloses a large - volume batch mixing truck for cementing operations, which comprises a vehicle frame and a batch mixing system fixedly connected to the middle of its top. A power system, a slurry mixing system, a pipe manifold system and a control system are also installed on the top of the vehicle frame. Leg cylinders are fixedly connected to both the front and rear sides of the vehicle frame; the batch mixing system includes a batch mixing pump, a perfusion pump, a batch mixing tank and a batch mixing agitator fixedly connected to the top thereof. The present invention relates to the technical field of cementing operation equipment. For the large - volume batch mixing truck for cementing operations, the batch mixing pipe manifold and the perfusion pipe manifold can be replaced with each other for operation. In this way, it can be ensured that when the perfusion centrifugal pump or the batch mixing centrifugal pump cannot operate normally, there is an alternative solution to enable the batch mixing truck to continue operating, reducing the risk of work delay. The whole vehicle can achieve continuous batch mixing operation of a large volume of cement slurry, conforming to the development concept of "small well site, large operation", with convenient transportation and reliable operation, meeting the requirements of high - difficulty cementing operations.

Description

Technical Field

[0001] The present invention relates to the technical field of cementing operation equipment, and specifically to a large-volume batch mixer truck for cementing operations. Background Art

[0002] With the increasing demand of the oilfield service industry for the supporting capacity of cementing equipment, the technology of collaborative operation of multiple cementing equipment with large displacement and high pressure has gradually emerged. This technology has relatively high requirements for the density of cement slurry, and the continuous batch mixing equipment for cement slurry has come into being. The batch mixing operation is more uniform and stable than the slurry mixing of traditional cementing trucks, and the density fluctuation of the prepared cement slurry is smaller, which can meet the demanding accuracy requirements and is more conducive to improving the cementing quality.

[0003] Looking at major well sites in the country, conventional batch mixers are usually used for batch slurry mixing. The maximum slurry mixing capacity is 2.3 m³ / min. Based on factors such as the quality of cement ash and the ash feeding speed, it takes more than 10 minutes to mix a large volume of cement slurry with a qualified density, which cannot meet the demand for continuous operation of large-displacement cement slurry.

[0004] With the increasing number of high-difficulty operations such as large cement slurry volume and large-displacement displacement construction in shale gas development, the demand for uniform density of cement slurry and high-quality batch entry of slurry into the well is becoming increasingly obvious. Therefore, multiple batch mixing devices usually need to be arranged at the well site to work together to meet the demand for cement slurry. This operation method has problems such as occupying well site space and wasting operation costs. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a large-volume batch mixer truck for cementing operations, which solves the problem that with the improvement of operation requirements, multiple batch mixing devices usually need to be arranged at the well site to work together to meet the demand for cement slurry, resulting in occupying well site space and wasting operation costs.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A large-volume batch mixer truck for cementing operations includes a vehicle frame and a batch mixing system fixedly connected to the middle of its top. A power system, a slurry mixing system, a pipe manifold system, and a control system are also installed on the top of the vehicle frame. Leg cylinders are fixedly connected to both the front and rear sides of the vehicle frame.

[0007] The batch mixing system includes a batch mixing pump, a perfusion pump, a batch mixing tank and a batch mixing agitator fixedly connected to the top thereof. The inlet of the batch mixing pump is connected to the second outlet of the slurry mixing system through a feed batch mixing pipe. The outlet of the batch mixing pump is connected to the inlet of the batch mixing tank through a discharge batch mixing pipe. The middle of the discharge batch mixing pipe is connected to the outlet of the perfusion pump through a discharge perfusion pipe, and two output pipes are connected in the middle of the discharge perfusion pipe. The inlet of the perfusion pump is connected to the outlet of the batch mixing tank through a feed perfusion pipe. The batch mixing pump pumps the well-stirred slurry in the slurry mixing tank into the batch mixing tank, and the batch mixing agitator performs more sufficient stirring and mixing to make the density of the formed slurry uniform and stable, and then the perfusion pump pumps it to the downstream equipment for well cementing operation preparation;

[0008] A butterfly valve 8# is installed at one end of the discharge batch mixing pipe close to the batch mixing pump. A butterfly valve 9# is installed at a position on the discharge batch mixing pipe after the discharge perfusion pipe. Butterfly valves 2# and 5# are respectively installed at the front and rear positions of the output pipes on the discharge batch mixing pipe, and butterfly valves 3# and 4# are respectively installed on the two output pipes. Butterfly valves 10# and 1# are respectively installed at both ends of the feed perfusion pipe. Butterfly valves 11# and 7# are respectively installed at both ends of the feed batch mixing pipe. The position between the butterfly valve 10# and the butterfly valve 1 on the feed perfusion pipe is connected to the position between the butterfly valve 11# and the butterfly valve 7 on the feed batch mixing pipe through a transfer pipe, and a butterfly valve 6# is installed on the transfer pipe;

[0009] When the perfusion pump cannot operate normally, first mix the slurry normally to fill the batch mixing tank, then stop the slurry mixing operation, open the butterfly valves 10#, 6# and 7#, and the cement slurry in the batch mixing tank after the action of the batch mixing pump is output to the downstream equipment through the butterfly valves 5#, 3# or 5#, 4#. When the batch mixing pump cannot operate normally, open the butterfly valves 11#, 6# and 1#, and the cement slurry in the slurry mixing tank is transported to the batch mixing tank through the action of the perfusion pump through the butterfly valves 2#, 5# and 9#. When the batch mixing tank is full, stop the slurry mixing operation, and then restore the butterfly valves to the normal mode for perfusion operation.

[0010] Preferably, the slurry mixing system includes a slurry mixing tank and a large-capacity high-energy mixer fixedly connected to the top thereof. The ash inlet of the large-capacity high-energy mixer is connected with an ash inlet pipe. The primary slurry mixing port of the large-capacity high-energy mixer is connected with a jet pump through a water injection pipe, and the water inlet of the jet pump is communicated with a water inlet pipe. A flow meter, a filter and a butterfly valve are installed on the water inlet pipe.

[0011] Preferably, the first outlet of the slurry mixing tank is connected with a circulation pump through an input circulation pipe. The output port of the circulation pump is connected with the secondary slurry mixing port of the large-capacity high-energy mixer through an output circulation pipe, and butterfly valves are installed on both the input circulation pipe and the output circulation pipe.

[0012] Preferably, a detection pipeline is connected between the top of the slurry mixing tank and the output circulation pipeline, and a butterfly valve and a densitometer are installed on the detection pipeline.

[0013] Preferably, a dust hopper and an external water supply manifold are fixedly connected to the top of the batch mixing tank.

[0014] Preferably, the control system consists of a controller, a touch screen, an analog input / output module, and control software, and the manifold system includes all pipelines.

[0015] Beneficial effects

[0016] The present invention provides a large-volume batch mixing truck for cementing operations. Compared with the prior art, it has the following beneficial effects:

[0017] 1. A large-volume high-energy mixer is arranged to fundamentally solve the problem of insufficient slurry mixing capacity of existing batch mixing equipment.

[0018] 2. The circulating centrifugal pump 26 in the secondary slurry mixing manifold has a single function and is only used to complete the circulation of the cement slurry in the slurry mixing tank. It ensures more sufficient circulation of the cement slurry in the slurry mixing tank, which is beneficial to the mixing effect of the cement slurry; then, more sufficient mixing is completed in the large-capacity batch mixing tank, and the density of the formed slurry can be ensured to be uniform and stable.

[0019] 3. The batch mixing manifold and the perfusion manifold can be used interchangeably, so that when the perfusion centrifugal pump or the batch mixing centrifugal pump cannot operate normally, there is an alternative solution to enable the batch mixing truck to continue operating, reducing the risk of work delay.

[0020] 4. The whole vehicle can realize continuous batch mixing operation of a large volume of cement slurry, which conforms to the development concept of "large operations in small well sites", is convenient for transportation and reliable in operation, and meets the requirements of high-difficulty cementing operations.

[0021] 5. A single large-capacity batch mixing tank is adopted, and the residence time of the cement slurry is longer and the stirring is more sufficient. Compared with the conventional batch mixing truck, there is no need to repeatedly switch the batch mixing tank, which simplifies the operation and streamlines the structure.

[0022] 6. The whole vehicle can also realize the slurry mixing function of an ordinary cementing truck. By controlling the pneumatic butterfly valve through the operation console and making the batch mixing system not work, the cement slurry can be pumped to downstream equipment through the batch mixing pump. Description of the drawings

[0023] Figure 1 It is the front view of the overall structure of the present invention;

[0024] Figure 2 It is the process flow chart of the present invention;

[0025] Figure 3 It is the structural schematic diagram of the batch mixing tank of the present invention.

[0026] In the figure: 1. Power system; 2. Mud mixing system; 21. Mud mixing tank; 22. Large-volume high-energy mixer; 23. Jet pump; 24. Flowmeter; 25. Filter; 26. Circulation pump; 27. Density meter; 3. Pipe manifold system; 4. Batch mixing system; 41. Batch mixing pump; 42. Injection pump; 43. Batch mixing tank; 44. Batch mixing agitator; 45. Ash hopper; 46. External water supply pipe manifold; 5. Leg cylinder; 6. Frame; 7. Control system. Specific embodiments

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] Please refer to Figures 1-3 , the present invention provides a technical solution: a large-volume batch mixing truck for cementing operations, including a frame 6 and a batch mixing system 4 fixedly connected to the middle of its top, characterized in that: a power system 1, a mud mixing system 2, a pipe manifold system 3 and a control system 7 are also installed on the top of the frame 6, and the pipe manifold system 3 includes all pipelines; the control system 7 is composed of a controller, a touch screen, an analog input / output module and control software, and the system controls the ratio of the water inflow and the ash inflow by collecting the density of the cement slurry, the clear water flow rate and the cement slurry liquid level, so as to control the density of the cement slurry;

[0029] The power system 1 can be driven by an electric motor or a diesel engine. When driven by an electric motor, the power supply system of the well site is required, and the used electric motor needs to meet the explosion-proof grade requirements of the well site; when driven by a diesel engine, the power of the diesel engine can be appropriately reduced, and the power sources of some actuators are distributed to the vehicle chassis engine.

[0030] Leg cylinders 5 are fixedly connected to both the front and rear sides of the frame 6. When preparing for batch mixing operations, it is necessary to fill and extend the front and rear groups of leg cylinders 5 of the frame 6, and the leg cylinders 5 and the frame 6 jointly bear the overweight load when the mud tank is full; during the driving process and when not working, the leg cylinders 5 need to be retracted.

[0031] The batch mixing system 4 includes a batch mixing pump 41, a perfusion pump 42, a batch mixing tank 43 and a batch mixing agitator 44 fixedly connected to the top thereof. A dust hopper 45 and an external water supply manifold 46 are also fixedly connected to the top of the batch mixing tank 43. In view of the stringent requirements for the density of the cement slurry under high-difficulty cementing conditions, when there is a difference between the density of the cement slurry in the batch mixing tank 43 and the required density, cement ash can be added into the batch mixing tank 43 through the dust hopper 45 or clean water can be added through the external water supply manifold 46 to adjust the density of the cement slurry in the batch mixing tank 43, so as to mix cement slurry with an ideal density to complete the cementing operation. The inlet of the batch mixing pump 41 is connected to the second outlet of the mud mixing system 2 through an inlet batch mixing pipe, and the outlet of the batch mixing pump 41 is connected to the inlet of the batch mixing tank 43 through an outlet batch mixing pipe. The middle of the outlet batch mixing pipe is connected to the outlet of the perfusion pump 42 through an outlet perfusion pipe, and two output pipes are connected to the middle of the outlet perfusion pipe. The inlet of the perfusion pump 42 is connected to the outlet of the batch mixing tank 43 through an inlet perfusion pipe;

[0032] The batch mixing pump 41 pumps the stirred mud in the mud mixing tank 21 into the batch mixing tank 43, and the batch mixing agitator 44 conducts more sufficient stirring and mixing to make the density of the formed mud uniform and stable, meeting the requirements of high-difficulty cementing operations. Finally, the perfusion pump 42 pumps it to downstream equipment for preparation of cementing operations.

[0033] A butterfly valve 8# is installed at one end of the outlet batch mixing pipe close to the batch mixing pump 41. A butterfly valve 9# is installed at a position on the outlet batch mixing pipe after the outlet perfusion pipe. Butterfly valves 2# and 5# are respectively installed at positions on the outlet batch mixing pipe before and after the output pipes, and butterfly valves 3# and 4# are respectively installed on the two output pipes. Butterfly valves 10# and 1# are respectively installed at both ends of the inlet perfusion pipe, and butterfly valves 11# and 7# are respectively installed at both ends of the inlet batch mixing pipe. The position of the inlet perfusion pipe between the butterfly valves 10# and 1# is connected to the position of the inlet batch mixing pipe between the butterfly valves 11# and 7# through a transfer pipe, and a butterfly valve 6# is installed on the transfer pipe.

[0034] When the perfusion pump 42 cannot operate normally, the batch mixing tank 43 can be first filled with normal mud mixing, and then the mud mixing operation is stopped. The butterfly valves 10#, 6# and 7# are opened, and the cement slurry in the batch mixing tank 43 after the action of the batch mixing pump 41 is output to downstream equipment through the butterfly valves 5#, 3# or 5#, 4#; when the batch mixing pump 41 cannot operate normally, the butterfly valves 11#, 6# and 1# are opened, and the cement slurry in the mud mixing tank 21 can be transported to the batch mixing tank 43 through the action of the perfusion pump 42 through the butterfly valves 2#, 5# and 9#. After the batch mixing tank 43 is filled, the mud mixing operation is stopped, and then the butterfly valves are restored to the normal mode for perfusion operation. Although the mud mixing and batch mixing operations cannot be carried out simultaneously, this replacement mode can still ensure that the batch mixing truck completes the cementing operation, reducing the risk of work delay caused by equipment failure.

[0035] This batch mixing truck also has the function of ordinary cementing operations. The cement slurry can be directly output from the second outlet of the slurry mixing tank 21 to downstream equipment to complete the cementing operation: by opening butterfly valves 11# and 7#, under the action of the batch mixing pump 41, it passes through butterfly valves 8# and 5# and is output from the outlet of butterfly valve 3# or 4#. In this working condition, the batch mixing system does not need to work. This working mode is applicable to cementing environments with relatively low requirements for cement slurry.

[0036] The slurry mixing system 2 includes a slurry mixing tank 21 and a large-volume high-energy mixer 22 fixedly connected to its top. The ash inlet of the large-volume high-energy mixer 22 is connected with an ash inlet pipe. The primary slurry mixing port of the large-volume high-energy mixer 22 is connected with an injection pump 23 through a water injection pipe, and the water inlet of the injection pump 23 is communicated with a water inlet pipe. A flow meter 24, a filter 25 and a butterfly valve are installed on the water inlet pipe. The first outlet of the slurry mixing tank 21 is connected with a circulation pump 26 through an input circulation pipe. The outlet of the circulation pump 26 is connected with the secondary slurry mixing port of the large-volume high-energy mixer 22 through an output circulation pipe. Butterfly valves are installed on both the input circulation pipe and the output circulation pipe. A detection pipeline is communicated between the top of the slurry mixing tank 21 and the output circulation pipe, and a butterfly valve and a densitometer 27 are installed on the detection pipeline.

[0037] The ash inlet pipe adds cement ash into the large-volume high-energy mixer 22. At the same time, the injection pump 23 pumps water into the large-volume high-energy mixer 22, where it is preliminarily mixed with the cement ash and then falls into the slurry mixing tank 21. The circulation pump 26 extracts the slurry in the slurry mixing tank 21 through the input circulation pipe and then discharges it back into the large-volume high-energy mixer 22 through the output circulation pipe for secondary slurry mixing, making the cement slurry mixing more sufficient.

[0038] At the same time, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited, and conventional equipment can be used.

[0039] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0040] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large - volume batch mixing truck for cementing operations, comprising a vehicle frame (6) and a batch mixing system (4) fixedly connected to the middle of its top, characterized in that: The top of the vehicle frame (6) is also equipped with a power system (1), a slurry mixing system (2), a manifold system (3) and a control system (7). Both the front and rear sides of the vehicle frame (6) are fixedly connected with leg cylinders (5). The batch mixing system (4) includes a batch mixing pump (41), a perfusion pump (42), a batch mixing tank (43) and a batch mixing agitator (44) fixedly connected to the top thereof. The inlet of the batch mixing pump (41) is connected to the second outlet of the slurry mixing system (2) through a feed batch mixing pipe. The outlet of the batch mixing pump (41) is connected to the inlet of the batch mixing tank (43) through a discharge batch mixing pipe. The middle of the discharge batch mixing pipe is connected to the outlet of the perfusion pump (42) through a discharge perfusion pipe, and there are two output pipes connected to the middle of the discharge perfusion pipe. The inlet of the perfusion pump (42) is connected to the outlet of the batch mixing tank (43) through a feed perfusion pipe. The batch mixing pump 41 pumps the slurry stirred well in the slurry mixing tank 21 into the batch mixing tank (43), and is more fully stirred and mixed by the batch mixing agitator (44) to make the density of the formed slurry uniform and stable, and then is pumped by the perfusion pump (42) to downstream equipment for well cementing operation preparation. A butterfly valve 8# is installed at one end of the discharge batch mixing pipe close to the batch mixing pump (41). A butterfly valve 9# is installed at a position on the discharge batch mixing pipe after the discharge perfusion pipe. Butterfly valves 2# and 5# are respectively installed at the front and rear positions of the output pipes on the discharge batch mixing pipe, and butterfly valves 3# and 4# are respectively installed on the two output pipes. Butterfly valves 10# and 1# are respectively installed at both ends of the feed perfusion pipe. Butterfly valves 11# and 7# are respectively installed at both ends of the feed batch mixing pipe. The position of the feed perfusion pipe between the butterfly valves 10# and 1# is connected to the position of the feed batch mixing pipe between the butterfly valves 11# and 7# through a transfer pipe, and a butterfly valve 6# is installed on the transfer pipe. When the perfusion pump (42) cannot operate normally, first mix the slurry normally to fill the batch mixing tank (43), then stop the slurry mixing operation, open the butterfly valves 10#, 6# and 7#, and the cement slurry in the batch mixing tank (43) after the action of the batch mixing pump (41) is output to downstream equipment through the butterfly valves 5#, 3# or 5#, 4#. When the batch mixing pump (41) cannot operate normally, open the butterfly valves 11#, 6# and 1#, and the cement slurry in the slurry mixing tank (21) is transported to the batch mixing tank (43) through the action of the perfusion pump (42) through the butterfly valves 2#, 5# and 9#. When the batch mixing tank (43) is filled, stop the slurry mixing operation, and then restore the butterfly valves to the normal mode for perfusion operation.

2. The large - volume batch mixer truck for cementing operation according to claim 1, characterized in that: The slurry mixing system (2) includes a slurry mixing tank (21) and a large-volume high-energy mixer (22) fixedly connected to the top thereof. The ash inlet of the large-volume high-energy mixer (22) is connected with an ash inlet pipe. The primary slurry mixing port of the large-volume high-energy mixer (22) is connected with a jet pump (23) through a water injection pipe, and the water inlet of the jet pump (23) is communicated with a water inlet pipe. A flow meter (24), a filter (25) and a butterfly valve are installed on the water inlet pipe.

3. The large - volume batch mixer truck for cementing operations according to claim 2, characterized in that: The first outlet of the slurry mixing tank (21) is connected to a circulation pump (26) through an input circulation pipe. The output port of the circulation pump (26) is connected to the secondary slurry mixing port of a large-volume high-energy mixer (22) through an output circulation pipe. Butterfly valves are installed on both the input circulation pipe and the output circulation pipe.

4. A large - volume batch mixing truck for cementing operations according to claim 1, characterized in that: A detection pipeline is communicated between the top of the slurry mixing tank (21) and the output circulation pipe. A butterfly valve and a densitometer (27) are installed on the detection pipeline.

5. A large - volume batch mixing truck for cementing operations according to claim 1, characterized in that: A lower ash funnel (45) and an external water supply manifold (46) are also fixedly connected to the top of the batch mixing tank (43).

6. A large - volume batch - mixing truck for cementing operations according to claim 1, characterized in that: The control system (7) consists of a controller, a touch screen, an analog input / output module, and control software. The manifold system (3) includes all pipelines.

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