Drilling and completion fluid static settlement stability detection device and method

Abstract

The invention belongs to the technical field of oil and gas drilling, and particularly relates to a drilling and completion fluid static settlement stability detection device and method.The detection device comprises a mounting support, a supporting clamp, a force sensing mechanism, a temperature control sample tube and a detection upper computer; the force sensor is in communication connection with the detection upper computer; the supporting clamp is installed on the middle section of the temperature control sample tube, and the temperature control sample tube is obliquely arranged and is connected to the installation support through the supporting clamp in the mode that the inclination angle can be adjusted. According to the detection method, the bottom deposition solid phase height # imgabs0 # of the target drilling and completion fluid in the output pipe is calculated according to factory parameters of the device, parameters of the drilling and completion fluid and detection parameters of the detection device and serves as an evaluation parameter of the static settlement stability of the drilling and completion fluid. According to the technical scheme, on the basis of the gravity center change principle, the acting force # imgabs1 # is added to serve as a detection parameter, detection of the sedimentation stability of the drilling and completion fluid is achieved, the detection device is simple in structure and low in cost, and the detection method is convenient to implement and reliable in result.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas drilling, and in particular relates to a device and method for detecting static settlement stability of drilling and completion fluid. Background Art

[0002] Settlement stability is one of the important evaluation indicators of drilling and completion fluids. Drilling and completion fluids are left at the bottom of the well for a long time, and are easily delaminated due to the complex downhole environment such as high temperature and formation fluid contamination. During the drilling process, it causes uneven density, resulting in well control risks, water hole blockage, and electrical measurement that cannot reach the bottom. During the completion process, due to the small annular space, it causes hazards such as tool jamming and wellbore scrapping. Therefore, it is extremely important to scientifically and accurately evaluate the settlement stability of drilling and completion fluids.

[0003] At present, the commonly used methods for evaluating the static sedimentation stability of drilling and completion fluids are: (1) glass rod method, the drilling and completion fluid is placed in a constant temperature oven and kept still. When the set time comes, the aging tank is opened and the glass rod is freely inserted into the aging tank. If the sound of the glass rod touching the bottom can be heard, it means that the static sedimentation stability of the completion fluid is good, otherwise it is poor. This method is highly subjective and cannot be evaluated quantitatively; (2) spectrophotometer method, the stratification of the drilling and completion fluid is quantitatively tested using a spectrophotometer. Since most drilling and completion fluids are dark in color and have poor light transmittance, they cannot be accurately measured; (3) layered density measurement method, the drilling and completion fluid is placed in a constant temperature oven and kept still. When the set time comes, the aging tank is opened and the density of each layer is measured and the density difference index is calculated. This method cannot provide real-time feedback on the test results. The drilling fluid that was originally stationary will be taken out during the test, and the evaluation time for a single experiment is long; (4) X-ray excitation emission spectroscopy method, this test will not affect the originally stationary drilling fluid, and the density distribution of the drilling and completion fluid is tested by exciting X-rays to penetrate the kettle. However, there are certain safety risks and it is not possible to continuously collect test data in real time; (5) The main working principle of the needle-penetration settlement method is to insert the probe with the sensor into the drilling and completion fluid at a uniform speed. The sensor will encounter resistance during the uniform lowering process. At this time, the resistance value is displayed on the sensor output panel, and the settlement situation is judged according to the change of this resistance value. This method will destroy the "static" condition during measurement, affecting the accuracy of subsequent measurements. In addition, all existing settlement stability tests only test the vertical static state of the drilling fluid, and cannot evaluate high-angle wells and horizontal wells.

[0004] There are some settlement stability evaluation instruments in the prior art, which are designed with tilt angle dynamic settlement testers. However, through the principle of magnetic coupling of the rotor, when the center of gravity changes, the external control system generates thrust to complete the test. The test process requires measuring data every 30 minutes, the data is discontinuous, and the instrument design is complex, with many accessories and high precision requirements, which cannot meet the needs of on-site testing. The Chinese invention patent document with application number 2013101653782 discloses a suspension suspension determination device and a method for testing the suspension performance of a suspension by the center of gravity method. It adopts the same principle as above, and embeds a magnet or tightens a torque sensor in the joint. In the field application, it will fail due to magnetic force failure, inconsistent torque debugging and other problems, resulting in inaccurate testing, which is not suitable for on-site settlement stability testing of drilling and completion fluids. The Chinese invention patent document with application number 2015107244571 discloses a drilling fluid settlement stability evaluation device and method, which requires a connecting rod tilting hoisting method and uses a tension sensor to respond to changes. At present, the new evaluation instruments that the author has consulted all have the problems of complex design, inconvenient operation and low reproducibility. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to propose a device and method for detecting the static settlement stability of drilling and completion fluids. The device and method do not need to remove the originally static drilling fluid and will not destroy the "static placement" measurement conditions. The measurement process can provide real-time feedback on the results and has high measurement efficiency.

[0006] The present invention is achieved by adopting the following technical solutions:

[0007] A drilling and completion fluid static settlement stability detection device comprises a mounting bracket, a supporting fixture, a force sensing mechanism, a temperature-controlled sample tube and a detection host computer; the force sensor is communicatively connected to the detection host computer; the supporting fixture is installed in the middle section of the temperature-controlled sample tube, the temperature-controlled sample tube is tilted, and is connected to the mounting bracket through the supporting fixture with an adjustable tilt angle.

[0008] Preferably, the temperature-controlled sample tube comprises an inner lining tube body; a heating jacket is arranged outside the inner lining tube body, and plugs are respectively arranged at both ends of the inner lining tube body.

[0009] Preferably, the mounting bracket is formed by splicing profiles.

[0010] Preferably, the mounting bracket includes an "I"-shaped base and an "H"-shaped frame; the "H"-shaped frame is vertically fixed on the "I"-shaped base, and bearing mechanisms for connecting the support clamps are symmetrically arranged on both sides of the "H"-shaped frame.

[0011] Preferably, the bearing mechanism comprises a bearing seat, and a bearing body is embedded in the bearing seat.

[0012] Preferably, the supporting fixture comprises an annular fixing ring, and connecting shafts are coaxially arranged at both ends of the annular fixing ring.

[0013] Based on the above-mentioned drilling and completion fluid static settlement stability detection device, this technical solution proposes a drilling and completion fluid static settlement stability detection method, which specifically includes the following steps:

[0014] S1, based on the factory data of the detection device, the factory parameters of the device are obtained, and the factory parameters of the device are input into the detection host computer; wherein the factory parameters include: the mass M of the temperature-controlled sample tube, the inner radius r of the temperature-controlled sample tube, and the length L of the temperature-controlled sample tube;

[0015] S2, based on the drilling and logging data, obtain the target drilling and completion fluid parameters, and input the target drilling and completion fluid parameters into the detection host computer; wherein the target drilling and completion fluid parameters include the solid phase density P s , liquid density P l , homogeneous drilling and completion fluid density P, solid-liquid phase ratio v and actual well inclination angle θ;

[0016] S3, fill the temperature-controlled sample tube of the detection device with the target drilling and completion fluid, and adjust the inclination angle of the temperature-controlled sample tube to be consistent with the actual well inclination angle θ;

[0017] S4, placing the force sensing mechanism so that the bottom of the temperature-controlled sample tube acts on the force sensing mechanism;

[0018] S5, using the force sensing mechanism to obtain the detection parameters in real time, and uploading the detection parameters to the detection host computer in real time; wherein the detection parameters are the force G exerted by the temperature-controlled sample tube on the force sensing mechanism;

[0019] S6, using the detection host computer to calculate the bottom deposited solid phase height H of the target drilling and completion fluid in the output pipe according to the factory parameters of the device, the target drilling and completion fluid parameters and the detection parameters v , the bottom deposited solid phase height H v As an evaluation parameter for the static settlement stability of drilling and completion fluids.

[0020] Preferably, in step S6, the bottom deposited solid phase height H of the target drilling and completion fluid in the pipe is calculated. v The following steps are involved:

[0021] S61, according to the settling process of the target drilling and completion fluid, a gravity center resultant moment formula is established; wherein the gravity center resultant moment formula is expressed as:

[0022]

[0023] Where g represents the acceleration of gravity; x represents the distance the center of gravity of the target drilling and completion fluid drops after settling;

[0024] Hv =vH, H represents the liquid phase height of the target drilling and completion fluid after sedimentation;

[0025] S62, establishing a gravity detection formula according to the working principle of the detection device; wherein the gravity detection formula is expressed as:

[0026]

[0027] S63, combine the gravity center moment formula and gravity detection formula to calculate the height H of the two bottom sediment solid phases v value;

[0028] S64, solid phase height H is deposited at the two bottoms v Select the value that satisfies value as the final result.

[0029] Beneficial technical effects brought by the present invention:

[0030] 1) This technical solution proposes a drilling and completion fluid static settlement stability detection device. Specifically, based on the existing easily accessible data, a special detection device is proposed. Based on the principle of center of gravity change, a force G is added as a detection parameter to realize the detection of drilling and completion fluid settlement stability. The detection device has a simple structure and low cost.

[0031] 2) This technical solution proposes a method for detecting the static settlement stability of drilling and completion fluids. Based on the static settlement stability detection device of drilling and completion fluids proposed in this technical solution, during the detection process, there is no need to remove the originally static drilling and completion fluids, that is, the measurement conditions of "static placement" will not be destroyed. The implementation is convenient, easy to achieve, and the results are reliable. Furthermore, the detection process can provide real-time feedback on the results, which improves the measurement efficiency.

[0032] 3) This technical solution proposes a method for detecting the static settling stability of drilling and completion fluids. Based on a device for detecting the static settling stability of drilling and completion fluids proposed in this technical solution, and based on the fixed containing volume of the temperature-controlled sample tube in the detection device, this technical solution belongs to quantitative evaluation, and the measurement results are intuitive, accurate and objective. The obtained "sedimentation solid phase height H v The data can be directly used for on-site guidance of drilling and completion. Based on this, this technical solution can be applied to evaluate the static settlement stability of drilling and completion fluids in highly deviated wells and horizontal wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a basic implementation flow chart of the detection method of this technical solution;

[0034] Figure 2 This is a schematic diagram of the top view of the detection device of this technical solution;

[0035] Figure 3 This is a schematic diagram of the overall structure of the detection device of this technical solution;

[0036] Figure 4 This is a schematic diagram of the detection principle of the detection device of this technical solution.

[0037] In the figure:

[0038] 1. Mounting bracket; 1.1. “I” shaped base; 1.2. “H” shaped stand; 1.3. Bearing mechanism; 1.31. Bearing seat; 1.32. Bearing body; 2. Support fixture; 2.1. Annular fixing ring; 2.2. Connecting shaft; 3. Temperature-controlled sample tube; 3.1. Lining tube body; 3.2. Heating jacket; 3.3. Plug; 4. Force sensing mechanism. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0040] Therefore, the following detailed description of the invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0041] Example 1

[0042] This embodiment discloses a drilling and completion fluid static settlement stability detection device and method. As a basic implementation scheme of the present invention, the detection device structure is as follows: Figure 1 As shown, it includes a mounting bracket 1, a supporting fixture 2, a force sensing mechanism 4 (a force sensor or a digital balance scale can be selected), a temperature-controlled sample tube 3 and a detection host computer; the force sensor is communicatively connected to the detection host computer; the supporting fixture 2 is installed in the middle section of the temperature-controlled sample tube 3, the temperature-controlled sample tube 3 is tilted, and is connected to the mounting bracket 1 through the supporting fixture 2 with an adjustable tilt angle.

[0043] Based on the structure of the above-mentioned detection device, its working principle is as follows: During the static sedimentation process of the drilling and completion fluid, heavier solid phase materials such as barite settle downward, causing the center of gravity of the temperature-controlled sample tube 3 to change, which further causes the force acting on the force sensing mechanism 4 by the temperature-controlled sample tube 3 to change, and the detection value of the force sensing mechanism 4 also changes accordingly. Furthermore, the force sensing mechanism 4 is connected to the detection host computer, and real-time calculations can be performed on the computer, the solid phase sedimentation height can be displayed in real time, the test data can be recorded, and a time-sedimentation solid phase height curve can be formed. Therefore, the technical solution detects the static sedimentation stability of the drilling and completion fluid based on the change of the center of gravity, and specifically includes the following steps:

[0044] S1, based on the factory data of the detection device, the factory parameters of the device are obtained, and the factory parameters of the device are input into the detection host computer; wherein the factory parameters include: the mass M of the temperature-controlled sample tube 3, the inner radius r of the temperature-controlled sample tube 3 and the length L of the temperature-controlled sample tube 3;

[0045] S2, based on the drilling and logging data, obtain the target drilling and completion fluid parameters, and input the target drilling and completion fluid parameters into the detection host computer; wherein the target drilling and completion fluid parameters include the solid phase density P s , liquid density P l , homogeneous drilling and completion fluid density P, solid-liquid phase ratio v and actual well inclination angle θ;

[0046] S3, fill the temperature-controlled sample tube 3 of the detection device with the target drilling and completion fluid, and adjust the inclination angle of the temperature-controlled sample tube 3 to be consistent with the actual well inclination angle θ;

[0047] S4, placing the force sensing mechanism 4 so that the bottom of the temperature-controlled sample tube 3 acts on the force sensing mechanism 4;

[0048] S5, using the force sensing mechanism 4 to obtain the detection parameters in real time, and uploading the detection parameters to the detection host computer in real time; wherein the detection parameters are the force G exerted by the temperature-controlled sample tube 3 on the force sensing mechanism 4;

[0049] S6, using the detection host computer to calculate the bottom deposited solid phase height H of the target drilling and completion fluid in the output pipe according to the factory parameters of the device, the target drilling and completion fluid parameters and the detection parameters v , the bottom deposited solid phase height H v As an evaluation parameter of the static sedimentation stability of drilling and completion fluids, the more solid phases are deposited at the bottom, the worse the stability of the solid phase suspension in the liquid.

[0050] In summary, in this technical solution, the input of the detection host computer includes the mass M of the temperature-controlled sample tube 3, the inner radius r of the temperature-controlled sample tube 3, the length L of the temperature-controlled sample tube 3, the solid phase density P s , liquid density P l, homogeneous drilling and completion fluid density P (solid-liquid mixed density), solid-liquid phase ratio v (volume ratio: solid phase / liquid phase), actual well inclination angle θ and force G; the output is the bottom deposited solid phase height H v . Among them, except for the detection parameter force G, the other parameters are known parameters that can be obtained before the test. Based on this, this technical solution proposes a special detection device based on the existing easily accessible data, based on the principle of center of gravity change, and adds a force G as a detection parameter to realize the detection of drilling and completion fluid settlement stability. The detection device has a simple structure and low cost, and the detection method is easy to implement, easy to achieve, and the results are reliable.

[0051] Example 2

[0052] This embodiment discloses a drilling and completion fluid static settlement stability detection device and method, as a preferred embodiment of the present invention, the detection device structure is as follows Figure 1 As shown, it includes a mounting bracket 1, a supporting fixture 2, a force sensing mechanism 4, a temperature-controlled sample tube 3 and a detection host computer; the force sensor is communicatively connected to the detection host computer; the supporting fixture 2 is installed in the middle section of the temperature-controlled sample tube 3, the temperature-controlled sample tube 3 is tilted, and is connected to the mounting bracket 1 through the supporting fixture 2 with an adjustable tilt angle.

[0053] Furthermore, the temperature-controlled sample tube 3 includes an inner liner tube body 3.1; a heating jacket 3.2 is disposed outside the inner liner tube body 3.1, and plugs 3.3 are disposed at both ends of the inner liner tube body 3.1. The plugs 3.3 are disposed to facilitate the loading and unloading of the drilling and completion fluid, and the heating jacket 3.2 is disposed to control the temperature of the drilling and completion fluid.

[0054] Furthermore, the mounting bracket 1 is formed by splicing profiles, and includes an "I"-shaped base and an "H"-shaped stand; the "H"-shaped stand is vertically fixed on the "I"-shaped base, and the two sides of the "H"-shaped stand are symmetrically provided with bearing mechanisms 1.3 for connecting the support fixture 2. The mounting bracket 1 has low material cost, simple structure and is firm.

[0055] Based on the above device structure, the specific detection method includes the following steps:

[0056] S1, based on the factory data of the detection device, the factory parameters of the device are obtained, and the factory parameters of the device are input into the detection host computer; wherein the factory parameters include: the mass M of the temperature-controlled sample tube 3, the inner radius r of the temperature-controlled sample tube 3 and the length L of the temperature-controlled sample tube 3;

[0057] S2, based on the drilling and logging data, obtain the target drilling and completion fluid parameters, and input the target drilling and completion fluid parameters into the detection host computer; wherein the target drilling and completion fluid parameters include the solid phase density P s , liquid density P l, homogeneous drilling and completion fluid density P, solid-liquid phase ratio v and actual well inclination angle θ;

[0058] S3, fill the temperature-controlled sample tube 3 of the detection device with the target drilling and completion fluid, and adjust the inclination angle of the temperature-controlled sample tube 3 to be consistent with the actual well inclination angle θ;

[0059] S4, placing the force sensing mechanism 4 so that the bottom of the temperature-controlled sample tube 3 acts on the force sensing mechanism 4;

[0060] S5, using the force sensing mechanism 4 to obtain the detection parameters in real time, and uploading the detection parameters to the detection host computer in real time; wherein the detection parameters are the force G exerted by the temperature-controlled sample tube 3 on the force sensing mechanism 4;

[0061] S6, using the detection host computer to calculate the bottom deposited solid phase height H of the target drilling and completion fluid in the output pipe according to the factory parameters of the device, the target drilling and completion fluid parameters and the detection parameters v , the bottom deposited solid phase height H v As an evaluation parameter for the static settlement stability of drilling and completion fluids.

[0062] Example 3

[0063] This embodiment discloses a drilling and completion fluid static settlement stability detection device and method, as a preferred embodiment of the present invention, the detection device structure is as follows Figure 1 As shown, it includes a mounting bracket 1, a supporting fixture 2, a force sensing mechanism 4, a temperature-controlled sample tube 3 and a detection host computer; the force sensor is communicatively connected to the detection host computer; the supporting fixture 2 is installed in the middle section of the temperature-controlled sample tube 3 (specifically, the midpoint of the temperature-controlled sample tube 3), the temperature-controlled sample tube 3 is tilted, and is connected to the mounting bracket 1 through the supporting fixture 2 with an adjustable tilt angle.

[0064] Furthermore, the temperature-controlled sample tube 3 comprises an inner lining tube body 3.1; a heating jacket 3.2 is arranged outside the inner lining tube body 3.1, and plugs 3.3 are arranged at both ends of the inner lining tube body 3.1.

[0065] Furthermore, the mounting bracket 1 is formed by splicing profiles, and includes an "I"-shaped base and an "H"-shaped frame; the "H"-shaped frame is vertically fixed on the "I"-shaped base, and bearing mechanisms 1.3 for connecting the support fixture 2 are symmetrically arranged on both sides of the "H"-shaped frame. The bearing mechanism 1.3 includes a bearing seat 1.31, and a bearing body 1.32 is embedded in the bearing seat 1.31, and the two bearing bodies 1.32 are coaxial.

[0066] Furthermore, the support fixture 2 includes an annular fixing ring 2.1, and connecting shafts 2.2 are coaxially arranged at both ends of the annular fixing ring 2.1, and the rotation axis of the connecting shaft 2.2 passes through the midpoint of the temperature-controlled sample tube 3. Based on this structure, the support fixture 2 and the temperature-controlled sample tube 3 can be designed as two independent entities, which not only ensures the integrity of the temperature-controlled sample tube 3, but also makes the assembly work of the detection device simpler and the replacement of parts of the detection device more convenient.

[0067] Based on the above device structure, the specific detection method includes the following steps:

[0068] S1, based on the factory data of the detection device, the factory parameters of the device are obtained, and the factory parameters of the device are input into the detection host computer; wherein the factory parameters include: the mass M of the temperature-controlled sample tube 3, the inner radius r of the temperature-controlled sample tube 3 and the length L of the temperature-controlled sample tube 3;

[0069] S2, based on the drilling and logging data, obtain the target drilling and completion fluid parameters, and input the target drilling and completion fluid parameters into the detection host computer; wherein the target drilling and completion fluid parameters include the solid phase density P s , liquid density P l , homogeneous drilling and completion fluid density P, solid-liquid phase ratio v and actual well inclination angle θ;

[0070] S3, fill the temperature-controlled sample tube 3 of the detection device with the target drilling and completion fluid, and adjust the inclination angle of the temperature-controlled sample tube 3 to be consistent with the actual well inclination angle θ;

[0071] S4, placing the force sensing mechanism 4 so that the bottom of the temperature-controlled sample tube 3 acts on the force sensing mechanism 4;

[0072] S5, using the force sensing mechanism 4 to obtain the detection parameters in real time, and uploading the detection parameters to the detection host computer in real time; wherein the detection parameters are the force G exerted by the temperature-controlled sample tube 3 on the force sensing mechanism 4;

[0073] S6, using the detection host computer to calculate the bottom deposited solid phase height H of the target drilling and completion fluid in the output pipe according to the factory parameters of the device, the target drilling and completion fluid parameters and the detection parameters v , the bottom deposited solid phase height H v As an evaluation parameter for the static settlement stability of drilling and completion fluids.

[0074] Example 4

[0075] This embodiment discloses a drilling and completion fluid static settlement stability detection device and method, as a preferred embodiment of the present invention, the detection device structure is as follows Figure 1As shown, it includes a mounting bracket 1, a supporting fixture 2, a force sensing mechanism 4, a temperature-controlled sample tube 3 and a detection host computer; the force sensor is communicatively connected to the detection host computer; the supporting fixture 2 is installed in the middle section of the temperature-controlled sample tube 3, the temperature-controlled sample tube 3 is tilted, and is connected to the mounting bracket 1 through the supporting fixture 2 with an adjustable tilt angle.

[0076] Furthermore, the temperature-controlled sample tube 3 comprises an inner lining tube body 3.1; a heating jacket 3.2 is arranged outside the inner lining tube body 3.1, and plugs 3.3 are arranged at both ends of the inner lining tube body 3.1.

[0077] Furthermore, the mounting bracket 1 is formed by splicing profiles, and includes an "I"-shaped base and an "H"-shaped frame; the "H"-shaped frame is vertically fixed on the "I"-shaped base, and bearing mechanisms 1.3 for connecting the support fixture 2 are symmetrically arranged on both sides of the "H"-shaped frame. The bearing mechanism 1.3 includes a bearing seat 1.31, and a bearing body 1.32 is embedded in the bearing seat 1.31.

[0078] Furthermore, the supporting fixture 2 comprises an annular fixing ring 2.1, and connecting shafts 2.2 are coaxially arranged at both ends of the annular fixing ring 2.1.

[0079] Based on the above device structure, the specific detection method includes the following steps:

[0080] S1, based on the factory data of the detection device, the factory parameters of the device are obtained, and the factory parameters of the device are input into the detection host computer; wherein the factory parameters include: the mass M of the temperature-controlled sample tube 3, the inner radius r of the temperature-controlled sample tube 3 and the length L of the temperature-controlled sample tube 3;

[0081] S2, based on the drilling and logging data, obtain the target drilling and completion fluid parameters, and input the target drilling and completion fluid parameters into the detection host computer; wherein the target drilling and completion fluid parameters include the solid phase density P s , liquid density P l , homogeneous drilling and completion fluid density P, solid-liquid phase ratio v and actual well inclination angle θ;

[0082] S3, fill the temperature-controlled sample tube 3 of the detection device with the target drilling and completion fluid, and adjust the inclination angle of the temperature-controlled sample tube 3 to be consistent with the actual well inclination angle θ;

[0083] S4, placing the force sensing mechanism 4 so that the bottom of the temperature-controlled sample tube 3 acts on the force sensing mechanism 4;

[0084] S5, using the force sensing mechanism 4 to obtain the detection parameters in real time, and uploading the detection parameters to the detection host computer in real time; wherein the detection parameters are the force G exerted by the temperature-controlled sample tube 3 on the force sensing mechanism 4;

[0085] S6, using the detection host computer to calculate the bottom deposited solid phase height H of the target drilling and completion fluid in the output pipe according to the factory parameters of the device, the target drilling and completion fluid parameters and the detection parameters v , the bottom deposited solid phase height H v As an evaluation parameter for the static settlement stability of drilling and completion fluids.

[0086] In actual situations, during the static settling of the drilling and completion fluid, all the solid phase within a certain length H at the top of the temperature-controlled sample tube 3 settles to the bottom of the temperature-controlled sample tube 3. Therefore, the length (height) of the solid phase accumulated at the bottom of the temperature-controlled sample tube 3 is H. v =vH, the middle part of the temperature-controlled sample tube 3 is still in a solid-liquid mixed state (equivalent to the original drilling and completion fluid). The middle part is regarded as a whole, and its density is P (i.e., the density of the original drilling and completion fluid). Furthermore, the overall center of gravity of the temperature-controlled sample tube 3 filled with drilling and completion fluid is shifted downward, and its distance from the initial center of gravity (i.e., the rotation center point, the midpoint of the temperature-controlled sample tube 3) is x, and the gravity acceleration is g. Based on this, the bottom deposited solid phase height H of the target drilling and completion fluid in the tube is calculated. v The following steps are involved:

[0087] S61, according to the sedimentation process of the target drilling and completion fluid, a formula for the combined moment of the center of gravity is established; wherein the temperature-controlled sample tube 3 is a cylinder with uniform density. According to the moment balance, inside the sample tube, the combined moment of the gravity of the objects on both sides of the center of gravity (the target drilling and completion fluid) on the center of gravity is 0. Based on this, the formula for the combined moment of the center of gravity is expressed as:

[0088]

[0089] Where g represents the acceleration of gravity; x represents the distance the center of gravity of the target drilling and completion fluid drops after settling;

[0090] H v =vH, H represents the liquid phase height of the target drilling and completion fluid after sedimentation;

[0091] S62, according to the working principle of the detection device, a gravity detection formula is established; wherein the temperature-controlled sample tube 3 filled with the target drilling and completion fluid is regarded as a whole, based on which the gravity detection formula is expressed as:

[0092]

[0093] S63, combine the gravity center moment formula and gravity detection formula to calculate the height H of the two bottom sediment solid phases v Specifically, according to the gravity center moment formula and gravity detection formula, the following H can be obtained: v The result of the simultaneous calculation of the values ​​(Note: due to H v The result of the simultaneous calculation of the values ​​is too long, so according to Hv The result of the simultaneous calculation of the values ​​is used to construct an intermediate replacement value A):

[0094]

[0095]

[0096] According to the above H v It can be seen from the simultaneous calculation result expression of the values ​​that the distance x of the center of gravity of the target drilling and completion fluid after sedimentation is an intermediate variable, and its specific value does not need to be obtained.

[0097] S64, solid phase height H is deposited at the two bottoms v Select the value that satisfies value as the final result.

Claims

1. A drilling and completion fluid static settlement stability detection device, Features: The invention comprises a mounting bracket (1), a supporting fixture (2), a force sensing mechanism (4), a temperature-controlled sample tube (3) and a detection host computer; the force sensor is communicatively connected to the detection host computer; the supporting fixture (2) is mounted on the middle section of the temperature-controlled sample tube (3); the temperature-controlled sample tube (3) is tilted and connected to the mounting bracket (1) through the supporting fixture (2) with an adjustable tilt angle.

2. A drilling and completion fluid static settlement stability detection device as claimed in claim 1, Features: The temperature-controlled sample tube (3) comprises an inner lining tube body (3.1); a heating jacket (3.2) is arranged outside the inner lining tube body (3.1), and stoppers (3.3) are respectively arranged at both ends of the inner lining tube body (3.1).

3. A drilling and completion fluid static settlement stability detection device as claimed in claim 1, Features: The mounting bracket (1) is formed by splicing profiles.

4. A drilling and completion fluid static settlement stability detection device as claimed in claim 1, Features: The mounting bracket (1) comprises an "I"-shaped base (1.1) and an "H"-shaped stand (1.2); the "H"-shaped stand (1.2) is vertically fixed to the "I"-shaped base (1.1), and bearing mechanisms (1.3) for connecting a support fixture (2) are symmetrically arranged on both sides of the "H"-shaped stand (1.2).

5. A drilling and completion fluid static settlement stability detection device as claimed in claim 4, Features: The bearing mechanism (1.3) comprises a bearing seat (1.31), and a bearing body (1.32) is embedded in the bearing seat (1.31).

6. A drilling and completion fluid static settlement stability detection device as claimed in claim 1, Features: The supporting clamp (2) comprises an annular fixing ring (2.1), and connecting shafts (2.2) are coaxially arranged at both ends of the annular fixing ring (2.1).

7. A method for detecting static settlement stability of drilling and completion fluids, It is characterized in that A drilling and completion fluid static settlement stability detection device as claimed in any one of claims 1 to 6 is used, comprising the following steps: S1, based on the factory data of the detection device, obtaining the factory parameters of the device, and inputting the factory parameters of the device into the detection host computer; wherein the factory parameters include: the mass M of the temperature-controlled sample tube (3), the inner radius r of the temperature-controlled sample tube (3) and the length L of the temperature-controlled sample tube (3); S2, based on the drilling and logging data, obtain the target drilling and completion fluid parameters, and input the target drilling and completion fluid parameters into the detection host computer; wherein the target drilling and completion fluid parameters include the solid phase density P s , liquid density P l , homogeneous drilling and completion fluid density P, solid-liquid phase ratio v and actual well inclination angle θ; S3, filling the temperature-controlled sample tube (3) of the detection device with the target drilling and completion fluid, and adjusting the inclination angle of the temperature-controlled sample tube (3) to be consistent with the actual well inclination angle θ; S4, placing the force sensing mechanism (4) so ​​that the bottom of the temperature-controlled sample tube (3) acts on the force sensing mechanism (4); S5, using the force sensing mechanism (4) to obtain detection parameters in real time, and uploading the detection parameters to the detection host computer in real time; wherein the detection parameters are the force G exerted by the temperature-controlled sample tube (3) on the force sensing mechanism (4); S6, using the detection host computer to calculate the bottom deposited solid phase height H of the target drilling and completion fluid in the output pipe according to the factory parameters of the device, the target drilling and completion fluid parameters and the detection parameters v , the bottom deposited solid phase height H v As an evaluation parameter for the static settlement stability of drilling and completion fluids.

8. A method for detecting static settlement stability of drilling and completion fluids as claimed in claim 7, Features: In step S6, the bottom deposited solid phase height H of the target drilling and completion fluid in the pipe is calculated. v The following steps are involved: S61, according to the settling process of the target drilling and completion fluid, a gravity center resultant moment formula is established; wherein the gravity center resultant moment formula is expressed as: Where g represents the acceleration of gravity; x represents the distance the center of gravity of the target drilling and completion fluid drops after settling; H v =vH, H represents the liquid phase height of the target drilling and completion fluid after sedimentation; S62, establishing a gravity detection formula according to the working principle of the detection device; wherein the gravity detection formula is expressed as: S63, combine the gravity center moment formula and gravity detection formula to calculate the height H of the two bottom sediment solid phases v value; S64, solid phase height H is deposited at the two bottoms v Select the value that satisfies value as the final result.

Images