CN108827856B - A kind of rock slab installation device and method for conducting evaluation experiment - Google Patents

Abstract

The invention relates to a rock slab installation device and method for conducting a flow diversion capacity evaluation experiment, characterized in that the rock slab installation device comprises a bracket, a hydraulic lifting platform, a diversion chamber, a displacement sensor and a computer; The hydraulic lifting platform is fixedly arranged on the top, the guiding chamber is arranged on the top of the hydraulic lifting platform, the guiding channel is longitudinally opened on the top of the guiding chamber for adding rock slabs, and one side of the guiding chamber is opened There is a gas-liquid inlet and outlet; the displacement sensor is arranged on the top of the bracket, corresponding to the position of the displacement sensor, and the displacement sensor reflection pad is arranged on the top of the hydraulic lifting platform, and the displacement sensor is used for real-time acquisition of the displacement sensor. The displacement data of the rock slab; the displacement sensor and the hydraulic lifting platform are also electrically connected to the computer respectively, and the invention can be widely used in the technical fields of unconventional oil and gas field development and reservoir reconstruction.

Description

A kind of rock slab installation device and method for conducting evaluation experiment

technical field

The invention relates to a rock slab installation device and method used for a flow conductivity evaluation experiment, and belongs to the technical field of unconventional oil and gas field development and reservoir reconstruction.

Background technique

With the depletion of conventional oil and gas, the development of unconventional oil and gas has been paid more attention. The development of difficult-to-recover resources such as tight oil and gas, shale oil and gas, and tight volcanic rock gas requires horizontal well technology and large-scale hydraulic fracturing to obtain economic benefits. Volume fracturing is a hydraulic fracturing method developed rapidly with the needs of unconventional oil and gas development. After construction, complex fracture networks are usually formed. These fracture networks are composed of single fractures with different shapes and are the main channels for oil and gas flow. . The formation of fractures with high conductivity is one of the goals of volume fracturing, and conductivity experiments are required to evaluate the conductivity of fractures. Through a large number of experiments, predecessors have studied the factors affecting the conductivity of propped fractures, including the opening of the fracture, the roughness of the fracture surface, the concentration of sand laying, the type of sand laying and the test time, etc. measures and achieved good results.

At present, the evaluation instruments for fracture conductivity are basically unified, and the operation process has formed an industry standard. The diversion chamber is an important part of supporting the diversion capacity evaluation instrument. The rock slab is loaded into the diversion chamber to form cracks with certain diversion capacity. Retrofitting is a prerequisite for experimentation. On the one hand, the installation of slate is very time-consuming and labor-intensive, and the installation cost of a set of short-term diversion capacity test slates accounts for more than half of the total experimental time; The tightness of the flow chamber directly determines the success of the experiment. Studying how the slate can be efficiently loaded into the diversion chamber not only saves time and cost, but also guarantees the success of the experiment. In the prior art, the slate processed into the size of the diversion chamber is generally placed at the inlet of the diversion chamber, and the rock slab is pressed evenly with both hands and gradually enters the diversion chamber. The internal resistance of the sealant and the diversion chamber is increasing. When the rock slab goes deeper into a certain depth, tap the rock slab gradually with a rubber hammer to make it reach the desired position and fix it, and then turn the diversion chamber upside down by 180°. Use the same method as above to install another rock slab, and finally fix the rock slab with fixing screws.

However, the above method still has certain problems: 1) Using this method to install the rock slab, the rock slab needs to be manually pressed into a part of the diversion chamber gradually at the initial stage, and the sides of the rock slab are all sealed with sealant, and the rock slab The two ends are not parallel, and it is easy to damage the sealant when entering the diversion chamber. During the experiment, as the pressure on the rock slab increases, liquid leakage will occur, which will lead to the interruption of the experiment and reduce the success rate of the experiment. 2) After manually pressing the rock slab into the diversion chamber to a certain extent, hitting the rock slab with a rubber hammer and continuing to enter the diversion chamber cannot guarantee that the two ends of the rock slab enter in parallel. For the experimenter, it takes many repeated installations to succeed, which wastes unnecessary time. 3) The rock slab is gradually entered into the diversion chamber through the rubber hammer. The two ends of the rock slab are not uniformly stressed, so the depth of entry is different. It is necessary to continuously adjust the balance of the two ends of the rock slab, which is not conducive to controlling the opening of the initial crack.

SUMMARY OF THE INVENTION

In view of the above problems, the purpose of the present invention is to provide a rock slab installation device and method for the evaluation experiment of flow conductivity, which is efficient and time-saving and has a high experiment success rate.

In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a rock slab installation device for a flow diversion capacity evaluation experiment, characterized in that the rock slab installation device comprises a bracket, a hydraulic lifting platform, a diversion chamber, a displacement A sensor and a computer; the hydraulic lifting platform is fixedly installed on the support, the guiding chamber is provided on the top of the hydraulic lifting platform, and a guiding channel for adding rock slabs is longitudinally opened on the top of the guiding chamber. A gas-liquid inlet and outlet is provided on one side of the diversion chamber; the displacement sensor is arranged on the top of the bracket, corresponding to the position of the displacement sensor, and the displacement sensor reflection pad is arranged on the top of the hydraulic lifting platform. The sensor is used to collect the displacement data of the rock slab in real time; the displacement sensor and the hydraulic lifting platform are also electrically connected to the computer respectively.

Further, the top of the bracket is also provided with a spirit level.

Further, the hydraulic lifting platform includes a hydraulic press, a platform and a hydraulic pump; the bottom of the hydraulic press is fixedly connected to the support, the top of the hydraulic press is fixedly connected to the platform, the top of the platform is provided with the diversion chamber, and the The liquid inlet of the hydraulic press is connected to the liquid outlet of the hydraulic pump; the hydraulic press is also electrically connected to the computer.

Further, the bracket is a frame structure formed by the fixed connection of the base, the top plate, the support rod and the nut.

Further, a parameter setting module and a hydraulic press control module are provided in the computer; the parameter setting module is used to preset the parameters of the hydraulic press, the crack width of the rock slab and the The initial position of the diversion channel is sent to the hydraulic machine control module, wherein the parameters of the hydraulic machine include the lifting speed, the lifting height and the maximum lifting power of the hydraulic machine; the hydraulic machine control module is used for according to the displacement sensor. The displacement data collected in real time, the parameters of the hydraulic press, the crack width of the rock slab and the initial position of the rock slab in the diversion channel are used to control the opening or closing of the hydraulic press.

Further, the accuracy of the displacement sensor is 0.1 mm.

A method for installing a rock slab for a diversion capability evaluation experiment, characterized in that it includes the following steps: setting the crack width of the rock slab, and the initial position of the lower rock slab in the diversion channel, wherein the rock slab comprises a lower rock slab. Pad, lower sealing ring, lower rock slab, upper rock slab, upper sealing ring and upper pad; based on the data of the spirit level, adjust the bracket to ensure the level of the top plate of the bracket; place the guide chamber on the hydraulic lifting platform, Put the lower slate into the diversion channel, set the lower gasket on the lower sealing ring after applying the sealant, and place the lower shim on the top of the lower slate; start the hydraulic lifting platform, according to the displacement data collected in real time by the displacement sensor , press the lower rock slab into the preset initial position in the diversion channel through the lower block; invert the diversion chamber after adding the lower rock slab on the hydraulic lifting platform, and put the upper rock slab into the diversion channel Inside, cover the upper sealing ring with the sealant on the upper block, and place the upper block on the top of the upper rock slab; start the hydraulic lifting platform, and according to the displacement data collected in real time by the displacement sensor, the upper rock is moved by the upper block. The plate is pressed into the diversion channel, so that the crack between the lower rock plate and the upper rock plate reaches a preset crack width.

The present invention has the following advantages due to the adoption of the above technical solutions: 1. In the present invention, the hydraulic lifting platform is placed in the bracket, the top of the hydraulic lifting platform is provided with a diversion chamber, and the rock slab is pressed into the diversion chamber through the hydraulic lifting platform, avoiding the need for The problem of adjustment and correction in the process of manual installation of slate is avoided, and the process of repeated installation is avoided, which greatly saves the time of installing slate. 2. The present invention can detect whether the support is kept level by setting a level on the top of the support, so as to ensure that the two ends of the rock slab are uniformly stressed during the process of entering the diversion chamber. 3. The present invention adopts a displacement sensor and a displacement sensor reflection pad. The displacement sensor reflection pad is used in conjunction with the displacement sensor, and the displacement of the rock slab is collected in real time through the displacement sensor, which can accurately and quickly determine the crack opening of the rock slab. 4. Since water leakage occurs in the diversion capacity evaluation experiment, the experiment will be forced to be terminated. In the present invention, the rock slab is slowly and uniformly loaded into the diversion channel of the diversion chamber during the installation process to ensure the airtightness of the diversion chamber. , which greatly reduces the damage to the sealant applied around the slate, and can be widely used.

Description of drawings

Fig. 1 is the structural representation of the installation device of the present invention;

FIG. 2 is a schematic structural diagram of the process of adding a rock slab in the present invention.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings. It should be understood, however, that the accompanying drawings are provided only for a better understanding of the present invention, and they should not be construed to limit the present invention.

As shown in Figures 1 and 2, the rock slab installation device provided by the present invention for the evaluation experiment of the diversion capacity comprises a bracket 1, a hydraulic lifting platform 2, a diversion chamber 3, a level 4, a displacement sensor 5 and a computer 6, The bracket 1 is a frame structure formed by a base 11 , a support rod 12 , a top plate 13 and a nut 14 that are fixedly connected.

A hydraulic lifting platform 2 is fixedly arranged in the bracket 1 , and a guiding chamber 3 is arranged on the top of the hydraulic lifting platform 2 to control the lifting of the guiding chamber 3 . The guide chamber 3 is provided with a guide channel 31 for installing the rock slab 7 in the longitudinal direction, and a gas-liquid inlet and outlet 32 is opened on one side of the guide chamber 3 for gas-liquid introduction or discharge during the experiment. A spirit level 4 and a displacement sensor 5 are arranged on the top of the top plate 13. The spirit level 4 is used to determine whether the diversion chamber 3 is level during use, so as to ensure that the diversion chamber 3 is evenly stressed during use. Corresponding to the position of the displacement sensor 5, the top of the hydraulic lifting platform 2 is provided with a displacement sensor reflection pad 8, the displacement sensor reflection pad 8 is used in conjunction with the displacement sensor 5, and the displacement sensor 5 is used to collect the displacement data of the rock slab 7 in real time, so as to The adjustment accuracy of the cracks in the slate 7 in the final stage of the installation of the slate 7 is guaranteed.

The displacement sensor 5 and the hydraulic lifting platform 2 are also electrically connected to the computer 6 respectively.

In a preferred embodiment, the hydraulic lifting platform 2 includes a hydraulic press 21, a platform 22 and a hydraulic pump 23. The bottom of the hydraulic press 21 is fixedly arranged on the top of the base 11, the top of the hydraulic press 21 is fixedly connected to the platform 22, and a guide chamber is provided on the top of the platform 22. 3. The liquid inlet of the hydraulic press 21 is connected to the liquid outlet of the hydraulic pump 23 . The hydraulic press 21 is used to control the lifting and lowering of the platform 22 and provide power for the installation of the rock slab 7 . The hydraulic press 21 is also electrically connected to the computer 6 .

In a preferred embodiment, the computer 6 is provided with a parameter setting module and a hydraulic machine control module. The parameter setting module is used to preset the parameters of the hydraulic press 21, the crack width of the rock slab 7 and the initial position of the rock slab 7 in the diversion channel 31, and send them to the hydraulic press control module, wherein the parameters of the hydraulic press 21 include the hydraulic press 21. Lifting speed, lifting height and lifting maximum power. The hydraulic press control module is used to control the opening or closing of the hydraulic press 21 according to the displacement data collected in real time by the displacement sensor 5, the parameters of the hydraulic press 21, the crack width of the rock slab 7 and the initial position of the rock slab 7 in the diversion channel 31.

In a preferred embodiment, the accuracy of the displacement sensor 5 is 0.1 mm.

As shown in FIG. 2 , the following sequence from bottom to top of the rock plate 7 is the lower cushion block 71 , the lower sealing ring 72 , the lower rock plate 73 , the crack 74 , the upper rock plate 75 , the upper sealing ring 76 and the upper cushion block 77 . The specific embodiments describe in detail the rock slab installation method of the present invention for the evaluation experiment of flow conductivity:

1) Clean the guide channel 31 and the gas-liquid inlet and outlet 32 of the guide chamber 3 .

2) Set the crack width of the rock slab 7 and the initial position of the lower rock slab 73 in the diversion channel 31 .

3) Based on the data of the spirit level 4, adjust the nut 14 on the support rod 12 to ensure the level of the top plate 13.

4) Place the diversion chamber 3 on the hydraulic lifting platform 2, put the lower rock plate 73 into the diversion channel 31, set the lower gasket 71 on the lower sealing ring 72 after applying the sealant, and place the lower pad Block 71 is placed on top of lower slab 73 .

5) Start the hydraulic lifting platform 2, and slowly press the lower rock slab 73 into the preset initial position in the diversion channel 31 through the lower block 71 according to the displacement data collected in real time by the displacement sensor 5.

6) Invert the diversion chamber 3 with the lower rock plate 73 installed on the hydraulic lifting platform 2, put the upper rock plate 75 into the diversion channel 31, and set the upper sealing ring 76 after applying the sealant Block 77 and place the upper block 77 on top of the upper slate 75.

7) Start the hydraulic lifting platform 2, according to the displacement data collected in real time by the displacement sensor 5, slowly press the upper rock plate 75 into the diversion channel 31 through the upper block 77, so that the space between the upper rock plate 75 and the lower rock plate 73 is The crack reaches the preset crack width, and the hydraulic press 21 is depressurized. The upper sealing ring 76, the lower sealing ring 72, the upper slate 75 and the lower slate 73 jointly ensure the safety of the diversion chamber 3 after the slate 7 is installed. tightness.

In the above steps 4) and 6), the diversion chamber 3 can be placed on a horizontal operating table, the lower pad 71, the lower sealing ring 72 and the lower rock plate 73, or the upper rock plate 75, the upper sealing ring 76 and the upper block 77 are installed in the guide channel 31, and then the guide chamber 3 is placed on the hydraulic lifting platform 2.

Further, due to the extrusion effect of stress during the experiment, in most cases, the slate 7 will be firmly embedded in the diversion channel 31, and the slate 7 is not easy to be taken out after the experiment. Similar to the installation process, the present invention can be used. The installation device continues to pressurize the slate 7 on one side after the experiment, and pushes the slate 7 out of the diversion channel 31 , thereby unloading the slate 7 .

The above-mentioned embodiments are only used to illustrate the present invention, and the structure, connection method and manufacturing process of each component can be changed to some extent. Any equivalent transformation and improvement based on the technical solution of the present invention should not be used. Excluded from the scope of protection of the present invention.

Claims (6)

1. a rock slab installation device for a diversion capacity evaluation experiment, is characterized in that, this rock slab installation device comprises a bracket, a hydraulic lifting platform, a diversion chamber, a displacement sensor and a computer; The hydraulic lifting platform is fixed on the support, the guiding chamber is provided on the top of the hydraulic lifting platform, and the guiding channel is longitudinally opened on the top of the guiding chamber for adding rock slabs. One side is provided with a gas-liquid inlet and outlet; the rock slab is, from bottom to top, a lower pad, a lower sealing ring, a lower rock slab, a crack, an upper rock slab, an upper sealing ring and an upper pad; The displacement sensor is arranged on the top of the bracket, corresponding to the position of the displacement sensor, and the displacement sensor reflection pad is arranged on the top of the hydraulic lifting platform, and the displacement sensor is used to collect the displacement data of the rock slab in real time; The top of the bracket is also provided with a spirit level; The displacement sensor and the hydraulic lifting platform are also electrically connected to the computer respectively. 2. A rock slab installation device for a diversion capacity evaluation experiment as claimed in claim 1, wherein the hydraulic lifting platform comprises a hydraulic press, a platform and a hydraulic pump; The bottom of the hydraulic press is fixedly connected to the support, the top of the hydraulic press is fixedly connected to the platform, the top of the platform is provided with the diversion chamber, and the liquid inlet of the hydraulic press is connected to the liquid outlet of the hydraulic pump; The hydraulic press is also electrically connected to the computer. 3. a kind of rock slab installation device for flow diversion capacity evaluation experiment as claimed in claim 1, is characterized in that, described support is the frame structure that is fixedly connected by base, top plate, support rod and nut . 4. a kind of rock slab installation device for flow conductivity evaluation experiment as claimed in claim 1, is characterized in that, described computer is provided with parameter setting module and hydraulic press control module; The parameter setting module is used to preset the parameters of the hydraulic press, the crack width of the rock slab and the initial position of the rock slab in the diversion channel, and send them to the hydraulic press control module, wherein, The parameters of the hydraulic press include the lifting speed, the lifting height and the maximum lifting power of the hydraulic press; The hydraulic press control module is used to control the hydraulic press according to the displacement data collected in real time by the displacement sensor, the parameters of the hydraulic press, the crack width of the rock slab and the initial position of the rock slab in the diversion channel on or off. 5 . The device for adding a rock slab for a flow conductivity evaluation experiment according to any one of claims 1 to 4 , wherein the accuracy of the displacement sensor is 0.1 mm. 6 . 6. A method for installing a rock slab installation device based on claim 1 for the evaluation experiment of flow conductivity, is characterized in that, comprises the following steps: Setting the crack width of the rock slab and the initial position of the lower rock slab in the diversion channel, wherein the rock slab includes a lower pad, a lower sealing ring, a lower rock slab, an upper rock slab, an upper sealing ring and an upper pad; Based on the data of the spirit level, adjust the bracket to ensure the level of the top plate of the bracket; Place the diversion chamber on the hydraulic lifting platform, put the lower rock slab into the diversion channel, set the lower gasket on the lower sealing ring after applying sealant, and place the lower pad on the top of the lower rock slab; Start the hydraulic lifting platform, and press the lower rock slab into the preset initial position in the diversion channel through the lower block according to the displacement data collected in real time by the displacement sensor; Invert the diversion chamber after adding the lower rock slab on the hydraulic lifting platform, put the upper rock slab into the diversion channel, set the upper sealing ring after applying sealant with the upper pad, and place the upper pad on on top of the upper slate; Start the hydraulic lifting platform, and press the upper rock slab into the diversion channel through the upper block according to the displacement data collected in real time by the displacement sensor, so that the crack between the lower rock slab and the upper rock slab reaches the preset crack width.

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