Indoor evaluation method and device for while-drilling plugging drilling fluid to pass through rotation guiding system

Abstract

The invention relates to the technical field of oil exploitation, in particular to an indoor evaluation method and device for leakage-stopping drilling fluid passing through a rotary guiding system, and the method comprises the steps that when the leakage-stopping drilling fluid passes through screens at the left end and the right end of a mounting cylinder, the leakage-stopping drilling fluid generates different pressures on the left end and the right end of the screens; respectively acquiring pressure data of corresponding positions through a first acquisition probe and a second acquisition probe of the pressure sensor; calculating the pressure amplification of the collected pressure data by using the following formula; and evaluating the capability of the over-rotation steering drilling tool screen through the pressure amplification. The device is used for simulating the process that the drilling fluid circularly passes through the screen of the rotary steering drilling tool, the function of preferentially screening the drilling-following plugging drilling fluid for the rotary steering drilling tool indoors is achieved, the experiment cost and risk are remarkably reduced, and the problems that the experiment cost of the capability of the drilling-following plugging drilling fluid passing through the rotary steering drilling tool on site is high, and the risk is large are solved. And the blank of the indoor screening and evaluation technology of the plugging-while-drilling drilling fluid for the rotary steering drilling tool is filled.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil exploitation, and is an indoor evaluation method of a lost circulation control drilling fluid through a rotary steering system, and also includes an indoor evaluation device. BACKGROUND

[0002] With the exploration and development of deep-sea and deep-land oil and gas resources, the geological conditions become more and more complex, and the maximization of oil and gas resource exploitation becomes more and more difficult. The emergence of horizontal wells well solves the above problems, and directional drilling is particularly important in the process of horizontal well drilling. The rotary steering drilling tool is a directional drilling technology equipment. The rotary steering drilling tool not only overcomes the problems of the sliding directional drilling tool, such as inability to rotate, difficulty in carrying cuttings, inability to add drilling pressure to the bottom, and slow mechanical drilling speed, but also improves the drilling safety, the control accuracy of the wellbore trajectory, and the efficiency of oil and gas reservoir exploration and development. However, during the drilling process of the rotary steering drilling tool, the problem of lost circulation may also occur, and therefore the compatibility of the lost circulation control agent with the rotary steering system becomes particularly important.

[0003] At present, there are few lost circulation control agents for rotary steering systems, and there is no indoor experimental device and evaluation method for simulating the passage of lost circulation control drilling fluid through the rotary steering drilling tool. It is understood that the smallest aperture in the rotary steering drilling tool accessory is about 1.5 mm, which also puts higher requirements on the size of the lost circulation control agent. Because the oversized lost circulation control agent not only cannot pass through the rotary steering drilling tool, but also accumulates and blocks the accessory holes, causing problems such as interruption of instrument signal transmission, deviation of wellbore trajectory, and blockage of drilling fluid circulation; the undersized lost circulation control agent, although it can pass through the rotary steering system, will reduce the plugging effect, and even cause plugging failure. Moreover, there are too many uncertain factors in the field test of the lost circulation control agent, which may even cause damage to the rotary steering drilling tool and prolong the construction time.

[0004] Therefore, there is an urgent need for an indoor evaluation method and device of a lost circulation control drilling fluid through a rotary steering system to better develop the research of the lost circulation control agent through the rotary steering system and improve the safety and success rate of the lost circulation control through the rotary steering. SUMMARY

[0005] The present application provides an indoor evaluation method and device of a lost circulation control drilling fluid through a rotary steering system, which overcomes the shortcomings of the prior art. The indoor evaluation method and device can evaluate the capability of the lost circulation control drilling fluid through the rotary steering system (i.e. the rotary steering drilling tool) in the laboratory, and solve the problems of high test cost and high risk of the capability of the lost circulation control drilling fluid through the rotary steering system in the field.

[0006] One of the technical solutions of the present application is realized by the following measures: an indoor evaluation device, comprising a clamping device, a screen, an intermediate container, a pressure sensor, a pressure supply device and a confining pressure device, the clamping device comprising a clamping cylinder, a mounting cylinder being coaxially and fixedly installed in the clamping cylinder, the left and right ends of the mounting cylinder being respectively fixed with the screens, the confining pressure device being provided with a pressure applying opening corresponding to and communicating with the outside of the mounting cylinder, the liquid outlet of the intermediate container being communicated with the left end port of the clamping cylinder through a drilling fluid inlet pipe, the drilling fluid inlet pipe being serially connected with a liquid circulation device, the liquid return port of the intermediate container being communicated with the right end port of the clamping cylinder through a liquid return pipe, the first acquisition probe of the pressure sensor being fixedly installed at the left end port of the clamping cylinder, the second acquisition probe of the pressure sensor being fixedly installed at the right end port of the clamping cylinder, and the pressure supply end of the pressure supply device being communicated with the intermediate container.

[0007] The mounting cylinder is of a hollow structure. The pressure sensor can be the pressure sensor in the FD-II type drilling fluid pressure transmission and reservoir protection plugging evaluation instrument. The confining pressure is used to simulate the pressure atmosphere of the real formation environment.

[0008] The following is a further optimization or / and improvement of one of the above technical solutions of the present application: The left end port of the clamping cylinder can be fixedly installed with a left connector, and the liquid outlet of the intermediate container is communicated with the left connector through the drilling fluid inlet pipe.

[0009] The left end of the left connector can be fixedly installed with a valve; the left connector is provided with a first pressure monitoring port, and the first acquisition probe of the pressure sensor is fixedly installed in the first pressure monitoring port.

[0010] The right end port of the clamping cylinder can be fixedly installed with a right connector, and the liquid return port of the intermediate container is communicated with the right connector through the liquid return pipe.

[0011] The right end of the right connector can be fixedly installed with a valve; the right connector is provided with a second pressure monitoring port, and the second acquisition probe of the pressure sensor is fixedly installed in the second pressure monitoring port.

[0012] The clamping cylinder can comprise a left connecting cylinder and a right clamping cylinder, the right clamping cylinder is provided with a mounting groove in the left inner side, the mounting cylinder is sleeved in the mounting groove, the left connecting cylinder and the right clamping cylinder are fixedly installed together from left to right, the left end of the mounting cylinder abuts against the right end of the left connecting cylinder, the left connector is fixedly installed at the left end port of the left connecting cylinder, and the right connector is fixedly installed at the right end port of the right clamping cylinder; the right clamping cylinder is provided with a radial pressure applying hole communicated with the mounting groove, the pressure applying opening of the confining pressure device is communicated with a pressure applying pipe, and one end of the pressure applying pipe is fixedly installed in the radial pressure applying hole.

[0013] The left connecting cylinder and the right clamping cylinder can be connected by screw threads, the left connector can be fixedly installed at the left end port of the left connecting cylinder by screw threads, and the right connector can be fixedly installed at the right end port of the right clamping cylinder by screw threads.

[0014] The rubber sleeve is arranged outside the installation cylinder and in the installation groove, and a spacing is arranged between the outside of the rubber sleeve and the installation groove; the liquid circulating device adopts a circulating pump; the top of the intermediate container is provided with a pressurizing hole, a pressurizing end of the pressure supply device is communicated with the pressurizing hole of the intermediate container through a compressed gas pipeline, and a back pressure valve is connected in series on the compressed gas pipeline; a piston is arranged inside the intermediate container; the back liquid outlet is arranged at the intermediate container below the lower stroke end of the piston; and the intermediate container is provided with a drilling fluid inlet.

[0015] The piston vertically slides inside the intermediate container to compress the space below the intermediate container to increase the pressure thereof.

[0016] The second technical scheme of the present application is realized by the following measures: an indoor evaluation method for a lost circulation drilling fluid over-rotation steering system by using the indoor evaluation device of the first technical scheme, comprising: The pre-configured lost circulation drilling fluid is poured into the intermediate container, the pressure supply device is opened, the lost circulation drilling fluid in the intermediate container is pressurized, the pressurized lost circulation drilling fluid is delivered to the clamping cylinder through the circulating pump, the confining pressure device is opened, the required confining pressure is applied to the installation cylinder, then the lost circulation drilling fluid passes through the screens at the left and right ends of the installation cylinder, finally, the lost circulation drilling fluid returns to the intermediate container through the back liquid pipe; when the lost circulation drilling fluid passes through the screens at the left and right ends of the installation cylinder, the lost circulation drilling fluid generates different pressures at the left and right ends of the screens, and the first acquisition probe and the second acquisition probe of the pressure sensor respectively acquire pressure data at the corresponding positions; The acquired pressure data is calculated by using the following formula to obtain the pressure increment; the capacity of the screen of the over-rotation steering drilling tool is evaluated by using the pressure increment.

[0017] In the formula, E is the pressure increment, which is expressed by a percentage; P umax P1 is the maximum pressure acquired by the first acquisition probe, and the unit is MPa; P d P2 is the stable pressure acquired by the second acquisition probe, and the unit is MPa.

[0018] The following is a further optimization or / and improvement of the second technical scheme of the above application: When E<20%, the capacity of the screen of the over-rotation steering drilling tool is strong; when 20≤E<40%, the capacity of the screen of the over-rotation steering drilling tool is medium; and when E>40%, the capacity of the screen of the over-rotation steering drilling tool is weak.

[0019] In a specific implementation mode, the circulating pump flow rate can be changed to simulate and analyze the influence of displacement on the screen blockage of the rotary steering drilling tool.

[0020] In a specific implementation, the mesh size of the screen can be changed to analyze the ability of the lost circulation drilling fluid to pass through the rotary steerable drilling tool screen of different sizes.

[0021] The indoor evaluation method and the indoor evaluation device of the lost circulation drilling fluid through the rotary steerable system of the present application are used to simulate the process of the drilling fluid circulating through the rotary steerable drilling tool screen, realize the function of indoor preferential screening of the lost circulation drilling fluid for the rotary steerable drilling tool, and significantly reduce the experimental cost and risk, solve the problem of high experimental cost and risk of the field lost circulation drilling fluid passing through the rotary steerable drilling tool, and fill the gap of the indoor screening and evaluation technology of the lost circulation drilling fluid for the rotary steerable drilling tool. BRIEF DESCRIPTION OF DRAWINGS

[0022] ATTACHED Figure 1 The figure is a structural schematic diagram of the indoor evaluation device of the present application.

[0023] The codes in the drawings are as follows: 1 is a screen, 2 is an intermediate container, 3 is a pressure sensor, 4 is a confining pressure device, 5 is a circulating pump, 6 is a drilling fluid inlet pipe, 7 is a liquid return pipe, 8 is a first collection probe, 9 is a second collection probe, 10 is a left joint, 11 is a right joint, 12 is a left connecting cylinder, 13 is a right clamping cylinder, 14 is a radial pressure hole, 15 is a rubber sleeve, 16 is a back pressure valve, 17 is a data acquisition and processing device, 18 is a compressed gas bottle, and 19 is a mounting cylinder. DETAILED DESCRIPTION

[0024] The present application is not limited by the following examples, and the specific implementation can be determined according to the technical scheme of the present application and the actual situation.

[0025] In the present application, in order to facilitate description, the relative position relationship of each component is described according to the layout mode of the drawings attached to the specification, such as: the position relationship of front, back, up, down, left, right, etc. is determined according to the layout direction of the drawings attached to the specification. Figure 1 Figure 1

[0026] In the present application, unless otherwise specified, the devices and equipment used are commonly used devices and equipment. For example, the confining pressure device 4 is a confining pressure device 4 commonly used for applying confining pressure.

[0027] The present application will be further described below in conjunction with examples: Example 1: as shown in the attached Figure 1 ​​As shown, the indoor evaluation device includes a clamping device, a screen 1, an intermediate container 2, a pressure sensor 3, a pressure supply device, and a confining pressure device 4. The clamping device includes a clamping cylinder, inside which an installation cylinder 19 is coaxially fixed. Screens 1 are fixed at the left and right ends of the installation cylinder 19, respectively. The pressure application port of the confining pressure device 4 corresponds to and is connected to the outside of the installation cylinder 19. The liquid outlet of the intermediate container 2 is connected to the left port of the clamping cylinder through a drilling fluid inlet pipe 6. A liquid circulation device is connected in series on the drilling fluid inlet pipe 6. The liquid return port of the intermediate container 2 is connected to the right port of the clamping cylinder through a liquid return pipe 7. The first acquisition probe 8 of the pressure sensor 3 is fixedly installed at the left port of the clamping cylinder, and the second acquisition probe 9 of the pressure sensor 3 is fixedly installed at the right port of the clamping cylinder. The pressure supply end of the pressure supply device is connected to the intermediate container 2.

[0028] Pressure sensor 3 sends pressure data to data acquisition and processing device 17, which can be a computer. The pressure supply device uses compressed gas cylinder 18.

[0029] Example 2: As shown in the attached document Figure 1 As shown, as an optimization of the above embodiment, a left connector 10 is fixedly installed on the left port of the clamping cylinder, and the liquid outlet of the intermediate container 2 is connected to the left connector 10 through the drilling fluid inlet pipe 6.

[0030] Example 3: As an optimization of Example 2 above, a valve is fixedly installed on the left end of the left connector 10; a first pressure monitoring port is provided on the left connector 10, and the first acquisition probe 8 of the pressure sensor 3 is fixedly installed in the first pressure monitoring port.

[0031] The left end of the left connector 10 can be connected to the valve via threads, or the left connector 10 and the valve can be designed as an integral structure.

[0032] Example 4: As shown in the appendix Figure 1 As shown, as an optimization of the above embodiment, a right connector 11 is fixedly installed on the right port of the clamping cylinder, and the return port of the intermediate container 2 is connected to the right connector 11 through the return pipe 7.

[0033] Example 5: As an optimization of Example 4 above, a valve is fixedly installed on the right end of the right connector 11; a second pressure monitoring port is provided on the right connector 11, and the second acquisition probe 9 of the pressure sensor 3 is fixedly installed in the second pressure monitoring port.

[0034] The left end of the right connector 11 can be connected to the valve via threads, or the right connector 11 and the valve can be designed as an integral structure.

[0035] Example 6: As attached Figure 1As shown in the figure, as an optimization of the above embodiment, the clamping cylinder comprises a left connecting cylinder 12 and a right clamping cylinder 13, a mounting groove is arranged on the inner side of the left part of the right clamping cylinder 13, a mounting cylinder 19 is sleeved in the mounting groove, the left connecting cylinder 12 and the right clamping cylinder 13 are fixedly installed together from left to right, the left end of the mounting cylinder 19 abuts against the right end of the left connecting cylinder 12, the left joint 10 is fixedly installed at the left end port of the left connecting cylinder 12, and the right joint 11 is fixedly installed at the right end port of the right clamping cylinder 13; the right clamping cylinder 13 is provided with a radial pressing hole 14 in communication with the mounting groove, and a pressing pipe is in communication with the pressing port of the surrounding pressure device 4, one end of the pressing pipe is fixedly installed in the radial pressing hole 14.

[0036] In order to facilitate the disassembly and assembly of the mounting cylinder 19, the clamping cylinder can be designed as a split structure, that is, designed as a left connecting cylinder 12 and a right clamping cylinder 13; and can be disassembled and assembled through a screw connection.

[0037] In order to facilitate the disassembly and assembly of the mounting cylinder 19, the clamping cylinder can be designed as a split structure, that is, designed as a left connecting cylinder 12 and a right clamping cylinder 13; and can be disassembled and assembled through a screw connection.

[0038] After the surrounding pressure device 4 is started, the surrounding pressure fills the mounting groove between the outer side of the rubber sleeve 15, so as to fully surround the mounting cylinder 19. The design of the rubber sleeve 15 is used to uniformly apply the surrounding pressure to the mounting cylinder 19.

[0039] Example 8: An indoor evaluation method of the while-drilling leak-stopping drilling fluid over-rotation guiding system using the indoor evaluation device described in the above embodiment, comprising: The pre-configured while-drilling leak-stopping drilling fluid is poured into the intermediate container 2, the pressure supply device is opened, the while-drilling leak-stopping drilling fluid in the intermediate container 2 is pressurized, the pressurized while-drilling leak-stopping drilling fluid is transported to the clamping cylinder through the circulating pump 5, the surrounding pressure device 4 is opened, the required surrounding pressure is applied to the mounting cylinder 19, then the while-drilling leak-stopping drilling fluid passes through the screens 1 at the left and right ends of the mounting cylinder 19, and finally, the while-drilling leak-stopping drilling fluid returns to the intermediate container 2 through the return liquid pipe 7; when the while-drilling leak-stopping drilling fluid passes through the screens 1 at the left and right ends of the mounting cylinder 19, the while-drilling leak-stopping drilling fluid generates different pressures at the left and right ends of the screens 1, and the first acquisition probe 8 and the second acquisition probe 9 of the pressure sensor 3 respectively acquire the pressure data of the corresponding positions; The acquired pressure data is calculated by the following formula to obtain the pressure increment; In the formula, E is the pressure increment, expressed in percentage; P umax Pmax is the maximum pressure collected by the first collection probe 8, in MPa; P d Pst is the stable pressure collected by the second collection probe 9, in MPa.

[0040] When E<20%, the capacity of the over-rotating steering tool screen 1 is strong; when 20≤E<40%, the capacity of the over-rotating steering tool screen 1 is medium; and when >40%, the capacity of the over-rotating steering tool screen 1 is weak.

[0041] Example 9: The over-rotating steering tool screen 1 capacity of a certain while-drilling leak sealing drilling fluid is evaluated by using the above-mentioned while-drilling leak sealing drilling fluid over-rotating steering system indoor evaluation method.

[0042] Example 10: The over-rotating steering tool screen 1 capacity of a certain while-drilling leak sealing drilling fluid is evaluated by using the above-mentioned while-drilling leak sealing drilling fluid over-rotating steering system indoor evaluation method.

[0043] The pressure increment of Example 9 is 3.7%, and the pressure increment of Example 10 is 35.2%, so the while-drilling leak sealing drilling fluid in Example 9 has strong capacity to pass through the over-rotating steering tool screen 1, and the screen 1 is not easily blocked by the leak sealing agent; the while-drilling leak sealing drilling fluid in Example 10 has medium capacity to pass through the over-rotating steering tool screen 1, and there is a high possibility that the screen 1 is partially blocked.

[0044] The above technical features constitute the embodiments of the present application, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the needs of different situations.

Claims

1. An indoor evaluation device, characterized in that... The device includes a clamping device, a screen, an intermediate container, a pressure sensor, a pressure supply device, and a confining pressure device. The clamping device includes a clamping cylinder, inside which an installation cylinder is coaxially fixed. Screens are fixed at both ends of the installation cylinder. The pressure application port of the confining pressure device corresponds to and is connected to the outside of the installation cylinder. The outlet of the intermediate container is connected to the left port of the clamping cylinder through a drilling fluid inlet pipe. A liquid circulation device is connected in series on the drilling fluid inlet pipe. The return port of the intermediate container is connected to the right port of the clamping cylinder through a return pipe. The first acquisition probe of the pressure sensor is fixedly installed at the left port of the clamping cylinder, and the second acquisition probe of the pressure sensor is fixedly installed at the right port of the clamping cylinder. The pressure supply end of the pressure supply device is connected to the intermediate container.

2. The indoor evaluation device according to claim 1, characterized in that... A left connector is fixedly installed at the left end of the clamping cylinder, and the outlet of the middle container is connected to the left connector through the drilling fluid inlet pipe.

3. The indoor evaluation device according to claim 2, characterized in that... A valve is fixedly installed on the left end of the left connector; a first pressure monitoring port is provided on the left connector, and the first acquisition probe of the pressure sensor is fixedly installed in the first pressure monitoring port.

4. The indoor evaluation device according to claim 1, 2, or 3, characterized in that... A right connector is fixedly installed at the right end of the clamping cylinder, and the return port of the intermediate container is connected to the right connector through a return pipe.

5. The indoor evaluation device according to claim 4, characterized in that... A valve is fixedly installed on the right end of the right connector; a second pressure monitoring port is provided on the right connector, and the second acquisition probe of the pressure sensor is fixedly installed in the second pressure monitoring port.

6. The indoor evaluation device according to claim 1, 2, 3, or 5, characterized in that... The clamping cylinder includes a left connecting cylinder and a right clamping cylinder. An installation groove is provided on the inner side of the left part of the right clamping cylinder. The installation cylinder is fitted into the installation groove. The left connecting cylinder and the right clamping cylinder are fixedly installed together from left to right. The left end of the installation cylinder abuts against the right end of the left connecting cylinder. The left connector is fixedly installed at the left port of the left connecting cylinder, and the right connector is fixedly installed at the right port of the right clamping cylinder. The right clamping cylinder is provided with a radial pressure hole communicating with the installation groove. The pressure port of the confining pressure device is connected to a pressure pipe. One end of the pressure pipe is fixedly installed in the radial pressure hole.

7. The indoor evaluation device according to claim 4, characterized in that... The clamping cylinder includes a left connecting cylinder and a right clamping cylinder. An installation groove is provided on the inner side of the left part of the right clamping cylinder. The installation cylinder is fitted into the installation groove. The left connecting cylinder and the right clamping cylinder are fixedly installed together from left to right. The left end of the installation cylinder abuts against the right end of the left connecting cylinder. The left connector is fixedly installed at the left port of the left connecting cylinder, and the right connector is fixedly installed at the right port of the right clamping cylinder. The right clamping cylinder is provided with a radial pressure hole communicating with the installation groove. The pressure port of the confining pressure device is connected to a pressure pipe. One end of the pressure pipe is fixedly installed in the radial pressure hole.

8. The indoor evaluation device according to any one of claims 1 to 7, characterized in that... The outer side of the mounting cylinder is fitted with a rubber sleeve located in the mounting groove, and a gap is provided between the outer side of the rubber sleeve and the mounting groove; or / and, the liquid circulation equipment uses a circulation pump; the top of the intermediate container is provided with a pressure port, and the pressure supply end of the pressure supply device is connected to the pressure port of the intermediate container through a compressed gas pipeline, and a back pressure valve is connected in series on the compressed gas pipeline; or / and, a piston is provided at the top inside the intermediate container, and the return port is located in the intermediate container below the end point of the piston's downward stroke, and a drilling fluid inlet is provided on the intermediate container.

9. A method for indoor evaluation of drilling fluid passing through a rotary steering system using an indoor evaluation device according to any one of claims 1 to 8, characterized in that... include: The pre-prepared drilling fluid for plugging leaks is poured into the intermediate container. The pressure supply device is turned on to pressurize the drilling fluid in the intermediate container. The pressurized drilling fluid is then pumped to the clamping cylinder by a circulation pump. The confining pressure device is turned on to apply the required confining pressure to the installation cylinder. The drilling fluid then passes through the screens at both ends of the installation cylinder. Finally, the drilling fluid returns to the intermediate container through the return pipe. When the drilling fluid passes through the screens at both ends of the installation cylinder, it generates different pressures on the left and right ends of the screens. The pressure data at the corresponding positions is collected by the first and second acquisition probes of the pressure sensor. The collected pressure data is used to calculate the pressure increase using the following formula; the pressure increase is used to evaluate the ability of the rotary steerable drill string to pass through the screen. In the formula, E represents the pressure increase, expressed as a percentage; P umax The maximum pressure collected by the first acquisition probe is expressed in MPa. P d This represents the stable pressure measured by the second acquisition probe, in MPa.

10. The indoor evaluation method for drilling fluid passing through the rotary steering system for plugging leaks while drilling, as described in claim 1, 2, 3, or 4, is characterized in that... When E < 20%, the ability to pass through the rotary steerable drill string screen is strong; when 20 ≤ E < 40%, the ability to pass through the rotary steerable drill string screen is moderate; when > 40%, the ability to pass through the rotary steerable drill string screen is weak.

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