A method and apparatus for adjusting drilling parameters

Abstract

The application relates to a drilling parameter adjustment method and device, and the method comprises the following steps: obtaining an effective circulation time before cementing according to drilling data of a block where drilling has been completed; determining a cuttings flowback rate by using a cuttings flowback rate measuring device; obtaining current drilling parameters; substituting the effective circulation time and the cuttings flowback rate into a cuttings flowback amount expression to obtain a cuttings flowback amount; substituting the cuttings flowback rate and the drilling parameters into a cuttings accumulation amount expression to obtain a current cuttings accumulation amount; and adjusting the drilling parameters according to the size relationship between the cuttings flowback amount and the cuttings accumulation amount. The drilling parameter adjustment method and device provided by the application are simple in operation, low in cost, can meet the annular displacement requirement before cementing of a horizontal well, can reduce the resistance risk in the casing lowering process before cementing, can provide good wellbore conditions for cementing, and can be used for optimizing the drilling parameters of a horizontal well and providing a basis for drilling equipment selection.

Description

Technical Field

[0001] This application relates to the field of oil and gas well drilling, and in particular to a method and apparatus for adjusting drilling parameters. Background Technology

[0002] With the increased development of unconventional oil and gas resources such as shale gas and shale oil, the number of horizontal wells drilled has increased significantly. In recent years, horizontal well fracturing technology has developed rapidly, and cementing and fracturing completion has become the mainstream method for unconventional oil and gas resource development, which has correspondingly placed higher demands on cementing quality.

[0003] The quality of cementing in horizontal wells is closely related to annular clearance. The biggest difference between horizontal well cementing and conventional well cementing annular clearance lies in the clearance of existing cuttings beds and residual drill cuttings within the wellbore. While the theories related to wellbore cleaning during drilling are relatively mature, they primarily focus on drilling safety, such as Li Qi and Zhou Fengshan setting a critical relative thickness of 10% for cuttings beds. However, for cementing operations, time constraints mean that established theories cannot solve the problem of achieving complete clearance of drill cuttings within a limited time by adjusting drilling parameters. Summary of the Invention

[0004] To solve, or at least partially solve, the above-mentioned technical problems, this application provides a drilling parameter adjustment method, the method comprising the following steps: The effective circulation time before cementing is obtained from the drilling data of the completed well blocks; The cuttings return rate was determined using a cuttings return rate measuring device. Obtain the current drilling parameters; Substitute the effective cycle time and the cuttings return rate into the cuttings return amount expression to obtain the cuttings return amount; Substitute the cuttings return rate and the drilling parameters into the cuttings accumulation expression to obtain the current cuttings accumulation; Adjust drilling parameters based on the relationship between the amount of cuttings returned and the amount of cuttings accumulated.

[0005] Preferably, obtaining the effective circulation time before cementing based on drilling data from the completed drilling block includes the following steps: Obtain drilling data from several blocks that have been drilled. Filter all single-well cycle times from the drilling data; Calculate the average of all the single-well circulation times; The average value is taken as the effective cycle time.

[0006] Preferably, obtaining the current drilling parameters includes the following steps: Obtain the current mechanical drilling rate, wellbore diameter, pure drilling time, pump circulation time, number of vibrating screens started simultaneously, block well diameter enlargement rate, and block porosity.

[0007] Preferably, the expression for the amount of rock cuttings returned is: ; in, Indicates the amount of rock cuttings returned. Indicates the rate of rock cuttings return. Indicates the effective cycle time.

[0008] Preferably, the expression for the amount of rock debris accumulation is: ; in, Indicates the amount of rock debris accumulation. This indicates the current mechanical drilling speed. Indicates the current pure diamond time. Pi is a constant. Indicates the current porosity of the block. This indicates the current block well diameter enlargement rate. This indicates the current wellbore diameter. This indicates the number of vibrating screens currently running simultaneously. Indicates the rate of rock cuttings return. This indicates the current pump start-up cycle time.

[0009] Preferably, adjusting the drilling parameters based on the relationship between the amount of cuttings returned and the amount of cuttings accumulated includes the following steps: Determine whether the amount of rock cuttings returned is greater than the amount of rock cuttings accumulated; If so, maintain the current drilling parameters; If not, adjust the drilling parameters and return to the step of measuring the cuttings return rate using the cuttings return rate measuring device.

[0010] Preferably, the method further includes the step of: The cumulative amount of rock debris is obtained by summing up all the aforementioned rock debris accumulations. Adjust drilling parameters based on the relationship between the amount of cuttings returned and the cumulative amount of cuttings accumulated.

[0011] Preferably, the expression for the cumulative accumulation of rock debris is: ; in, This indicates the cumulative amount of rock debris. This represents the amount of rock debris accumulated in the nth calculation. Indicates the serial number.

[0012] Preferably, adjusting the drilling parameters based on the relationship between the amount of cuttings returned and the cumulative amount of cuttings accumulated includes the following steps: Determine whether the amount of rock cuttings returned is greater than the cumulative amount of rock cuttings accumulated; If so, maintain the current drilling parameters; If not, adjust the drilling parameters and return to the step of measuring the cuttings return rate using the cuttings return rate measuring device.

[0013] This application also provides a drilling parameter adjustment device, including: The effective cycle time acquisition module is used to acquire the effective cycle time before cementing based on the drilling data of the completed drilling blocks. The cuttings return rate measurement module is used to measure the cuttings return rate using a cuttings return rate measurement device. The current drilling parameter acquisition module is used to acquire the current drilling parameters; The cuttings return amount acquisition module is used to substitute the effective cycle time and the cuttings return rate into the cuttings return amount expression to obtain the cuttings return amount; The current cuttings accumulation module is used to substitute the cuttings return rate and the drilling parameters into the cuttings accumulation expression to obtain the current cuttings accumulation. The drilling parameter adjustment module is used to adjust the drilling parameters according to the relationship between the amount of cuttings returned and the amount of cuttings accumulated.

[0014] The technical solutions provided in this application have the following advantages compared with the prior art: The method provided in this application is simple to operate and low in cost; it can meet the requirements for annular clearance before cementing horizontal wells, and at the same time reduce the risk of obstruction during casing running before cementing, providing good wellbore conditions for cementing; it can be extended to optimize drilling parameters for horizontal wells and provide a basis for selecting drilling equipment. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A flowchart illustrating a drilling parameter adjustment method provided in this application embodiment; Figure 2 This is a schematic diagram of the cuttings return rate measuring device in a drilling parameter adjustment method provided in this application embodiment; Figure 3 This is a schematic diagram showing the usage status of the cuttings return rate measuring device in a drilling parameter adjustment method provided in this application embodiment; Figure 4 This is a schematic diagram of a drilling parameter adjustment device provided in an embodiment of this application. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] Figure 1 This is a flowchart illustrating a drilling parameter adjustment method provided in an embodiment of this application.

[0020] This application provides a method for adjusting drilling parameters, the method comprising the following steps: S1: Obtain the effective circulation time before cementing based on the drilling data of the completed well blocks; In this embodiment of the application, obtaining the effective cycle time before cementing based on drilling data from the completed drilling block includes the following steps: Obtain drilling data from several blocks that have been drilled. Filter all single-well cycle times from the drilling data; Calculate the average of all the single-well circulation times; The average value is taken as the effective cycle time.

[0021] Specifically, the effective circulation time before cementing is calculated by referring to the single-well circulation time of multiple completed drilling blocks. For example, there are N completed drilling blocks, each block corresponding to a drilling data (such as time data or logging data). The drilling data contains various data, one of which is the single-well circulation time of that block. Therefore, for the N completed drilling blocks, N single-well circulation times can be obtained. Then, the average of these N single-well circulation times is calculated, and this average value can be regarded as the effective circulation time.

[0022] In other embodiments, the median or mode of these N single-well cycle times can also be selected as the effective cycle time. The specific calculation steps are similar to those described above and will not be repeated here.

[0023] S2: The cuttings return rate was measured using a cuttings return rate measuring device; like Figures 2-3 In this embodiment of the application, the cuttings return rate is measured using a cuttings return rate measuring device before the end of each shift after the horizontal well is entered into the window. The specific steps are as follows: Step S21: First, the injection pump 7 injects 6% KCL brine into the chamber 1 of the cuttings return rate measuring device. After the liquid level reaches the preset height, the liquid level controller 10 controls the injection pump 7 to stop injecting KCL brine.

[0024] Step S22: Install the cuttings return rate measuring device chamber 1 below the drilling fluid vibrating screen 2, start the device timer 3, and begin collecting drilling cuttings.

[0025] Step S23: Drill cuttings returned from the drilling fluid vibrating screen 2 fall into the screen box 4, and the liquid level in the chamber 1 gradually rises. The liquid level data is collected in real time by the liquid level controller 10 and stored in the electronic memory 8. When the liquid level rises to the set height, the liquid level controller 10 issues a command to record the time point separately, and displays the time point, the corresponding increase in volume in the chamber 1, and the return rate of the returned cuttings Qf=ΔV / t1 on the LCD screen. After the cuttings return rate measuring device is connected to the logging system, it can transmit the increase in volume of liquid level height, time, and real-time cuttings return rate in real time. The screen box guide rail 9 is used to assist the screen box 4 in moving along the preset direction.

[0026] Furthermore, for sandstone or drill cuttings that are not easily dispersed in brine, step S24 should be performed: The screen box 4 is moved up and down using a servo motor or manually to remove non-drill cuttings components from the screen box 4 through the screen plate 5. After the drill cuttings in the screen box 4 are basically clean, the ultrasonic transducer 6 inside the instrument is activated to clean the drill cuttings using ultrasonic waves. After screening for non-drill cuttings again, the screen box 4 is lifted out of the chamber 1. The liquid level change after lifting the screen box 4 is recorded by the liquid level controller 10. The volume of the drill cuttings is calculated back through a logic program, and the corrected drill cuttings return rate is calculated. After the cleaned drill cuttings are dried, subsequent logging analysis can be performed.

[0027] S3: Get the current drilling parameters; In this embodiment of the application, obtaining the current drilling parameters includes the following steps: Obtain the current mechanical drilling rate, wellbore diameter, pure drilling time, pump circulation time, number of vibrating screens started simultaneously, block well diameter enlargement rate, and block porosity.

[0028] Specifically, current drilling parameters include: mechanical drilling rate, wellbore diameter, pure drilling time, pump circulation time, number of vibrating screens started simultaneously, block well diameter enlargement rate, and block porosity. These parameters can be obtained through corresponding measuring equipment or calculated or queried using geological knowledge. For example, the wellbore diameter can be measured using a measuring ruler. The acquisition of the above parameters is basic knowledge for those skilled in the art, so it will not be elaborated here.

[0029] S4: Substitute the effective cycle time and the cuttings return rate into the cuttings return amount expression to obtain the cuttings return amount; In this embodiment of the application, the expression for the amount of rock cuttings returned can be easily obtained based on mathematical knowledge: ; in, Indicates the amount of rock cuttings returned. Indicates the cuttings return rate (unit: m). 3 / h), Indicates the effective cycle time.

[0030] S5: Substitute the cuttings return rate and the drilling parameters into the cuttings accumulation expression to obtain the current cuttings accumulation; In this embodiment of the application, based on relevant knowledge in the drilling field, the expression for the amount of cuttings accumulation can be obtained as follows: ; in, Indicates the amount of rock debris accumulation. This indicates the current mechanical drilling speed. Indicates the current pure diamond time. Pi is a constant. Indicates the current porosity of the block. This indicates the current block well diameter enlargement rate. This indicates the current wellbore diameter. This indicates the number of vibrating screens currently running simultaneously. Indicates the rate of rock cuttings return. This indicates the current pump start-up cycle time.

[0031] S6: Adjust drilling parameters according to the relationship between the amount of cuttings returned and the amount of cuttings accumulated.

[0032] In this embodiment of the application, adjusting the drilling parameters based on the relationship between the amount of cuttings returned and the amount of cuttings accumulated includes the following steps: Determine whether the amount of rock cuttings returned is greater than the amount of rock cuttings accumulated; If so, maintain the current drilling parameters; If not, adjust the drilling parameters and return to the step of measuring the cuttings return rate using the cuttings return rate measuring device.

[0033] Specifically, cuttings return amount represents the quantity of cuttings returned from the wellbore after a drilling operation, while cuttings accumulation amount represents the quantity of cuttings accumulated in the wellbore after a single drilling operation. After a drilling operation, the cuttings return amount and the cuttings accumulation amount can be compared. If the cuttings return amount is greater than the cuttings accumulation amount, it means that all the cuttings in the wellbore can be returned and will not remain in the wellbore, thus not hindering drilling. In this case, it is sufficient to maintain the current drilling parameters. If the cuttings return amount is less than the cuttings accumulation amount, it means that not all the cuttings in the wellbore can be returned and will remain in the wellbore, thus hindering drilling. In this case, it is necessary to adjust the drilling parameters accordingly so that the cuttings return amount is at least equal to, or even greater than, the cuttings accumulation amount, thereby ensuring that drilling operations are not hindered.

[0034] Furthermore, in order to ensure that the amount of cuttings returned equals the amount of cuttings accumulated, the drilling parameters need to be adjusted after calculation. The specific adjustment methods are: increase the drilling speed by 20-40 rpm; increase the drilling flow rate by 1-2 L / s.

[0035] Furthermore, the drilling parameter adjustment method provided in this application also includes the following steps: S7: Sum the cumulative rock debris accumulations of all the aforementioned rock debris accumulations to obtain the cumulative rock debris accumulation; Specifically, according to mathematical knowledge, the cumulative accumulation of rock cuttings is the integral of the amount of rock cuttings returned. Therefore, the expression for the cumulative accumulation of rock cuttings is: ; in, This indicates the cumulative amount of rock debris. This represents the amount of rock debris accumulated in the nth calculation. Indicates the serial number.

[0036] S8: Adjust drilling parameters according to the relationship between the amount of cuttings returned and the amount of cumulative cuttings accumulation.

[0037] In this embodiment of the application, adjusting the drilling parameters based on the relationship between the amount of cuttings returned and the cumulative amount of cuttings accumulated includes the following steps: Determine whether the amount of rock cuttings returned is greater than the cumulative amount of rock cuttings accumulated; If so, maintain the current drilling parameters; If not, adjust the drilling parameters and return to the step of measuring the cuttings return rate using the cuttings return rate measuring device.

[0038] Specifically, the amount of cuttings returned represents the quantity of cuttings returned from the wellbore after drilling operations, while the cumulative amount of cuttings accumulated represents the quantity of cuttings that has accumulated in the wellbore after multiple drilling operations. After multiple drilling operations, the amount of cuttings returned and the cumulative amount of cuttings accumulated can be compared. If the amount of cuttings returned is greater than the cumulative amount of cuttings accumulated, it means that all the cuttings in the wellbore can be returned and will not remain in the wellbore, thus not hindering drilling. In this case, it is sufficient to maintain the current drilling parameters. If the amount of cuttings returned is less than the cumulative amount of cuttings accumulated, it means that not all the cuttings in the wellbore can be returned and will remain in the wellbore, thus hindering drilling. In this case, it is necessary to adjust the drilling parameters accordingly so that the amount of cuttings returned is at least equal to, or even greater than, the cumulative amount of cuttings accumulated, thereby ensuring that drilling operations are not hindered.

[0039] In this embodiment of the application, adjusting the drilling parameters includes the following steps: Increase drilling speed by 20-40 rpm; Increase drilling flow rate by 1-2 L / s.

[0040] Furthermore, in order to ensure that the amount of cuttings returned equals the amount of cuttings accumulated, the drilling parameters need to be adjusted after calculation. The specific adjustment method is to increase the drilling speed by 20-40 rpm and increase the drilling flow rate by 1-2 L / s.

[0041] The drilling parameter adjustment method provided in this application will be described in detail below with reference to specific embodiments.

[0042] This application will be further explained by taking the example of optimizing drilling parameters before cementing of horizontal well X1: Well X1 adopts a two-section wellbore structure with a two-section wellbore diameter D=215.9mm, an entry window of 3120m, and a designed horizontal section length of 750m. After drilling into the horizontal section, the rotation speed is 80rpm and the displacement is 30L / s, and three vibrating screens with a=3 are started at the same time.

[0043] Step 1: Determine the effective circulation time t before cementing.

[0044] By analyzing the time-dependent data of the completed drilling blocks, it can be determined that the average finite cycle time before cementing of the completed drilling is 485 minutes, so t = 485 minutes.

[0045] Step 2: Measure the cuttings return rate and calculate the amount of cuttings accumulated in the wellbore.

[0046] The average wellbore enlargement rate k=6.8% in the horizontal section of Block 2, the equivalent porosity φ=8% in the oil shale section of the reservoir, the mechanical drilling rate v=25m / h in the first shift, the pure drilling time tc=255min, the drilling pump circulation time tx=255min, and the footage obtained was 106.25m.

[0047] Determining the cuttings return rate: 52.5L of brine (6% KCl brine) was injected into the cuttings return rate measuring device, with the liquid level in the chamber at 30cm. The measurement program was preset to 30cm. After installing the device, cuttings were collected. After 20 minutes, the liquid level rose to the preset value. The cuttings return rate can be calculated using the formula: Qf = ΔV / t1 = 0.0525 / 0.33 = 0.159m 3 / min.

[0048] The amount of cuttings accumulated in the wellbore during the current shift can be calculated using the formula: =0.68m 3 .

[0049] Step 3: Adjust drilling parameters and measure the adjusted cuttings return rate.

[0050] The amount of cuttings returned during the effective circulation time before cementing can be calculated using the formula: =1.28m 3 ; Due to 1.28m 3 >0.68m 3 Therefore, it is determined that the rock cuttings accumulated in the wellbore of the current shift can be completely removed within the effective circulation time before cementing, and at this time, the current drilling parameters can be maintained to continue drilling.

[0051] Step 4: Calculate the cumulative amount of cuttings accumulated in the wellbore, adjust the drilling parameters, and determine the adjusted cuttings return rate.

[0052] The cumulative amount of rock cuttings accumulated inside the wellbore can be calculated using the formula: =Vd1=0.68m 3 ; Due to 1.28m 3 >0.68m 3 If the cumulative amount of cuttings accumulated in the wellbore can be completely removed within the effective circulation time before cementing, then drilling can continue while maintaining the current drilling parameters.

[0053] Then repeat steps two through four above for the first time: Repeat step two: the second shift had a mechanical drilling rate of v=28m / h, a pure drilling time of tc=350min, a drilling pump circulation time of tx=350min, and a drilling footage of 163.33m.

[0054] The cuttings return rate was measured: After collecting cuttings for 25 minutes, the liquid level rose to a preset value. The cuttings return rate was calculated using the formula Qf = ΔV / t1 = 0.0525 / 0.416 = 0.126 m / s². 3 / min.

[0055] The amount of cuttings accumulated in the wellbore during the current shift can be calculated using the formula. =1.36m 3 .

[0056] Repeat step three: The amount of cuttings returned during the effective circulation time before cementing can be calculated using the formula: =1.02m 3 ; Due to 1.02m 3 <1.36m 3 If this is the case, it can be determined that the accumulated cuttings in the wellbore cannot be completely removed within the effective circulation time before cementing. In this case, drilling parameters need to be adjusted, specifically, the drilling speed should be adjusted to 100 rpm and the flow rate to 31 L / s. Simultaneously, the cuttings return rate after adjustment should be measured: 18 minutes after collecting cuttings, the fluid level rises to the preset value. The cuttings return rate can be calculated using the formula Qf = ΔV / t1 = 0.0525 / 0.3 = 0.175 m. 3 / min.

[0057] The amount of cuttings returned during the effective circulation time before cementing can be calculated using the formula: =1.41m 3 ; Due to 1.41m 3 >1.36m 3 If so, it can be determined that the rock cuttings accumulated in the wellbore of the current shift can be completely removed within the effective circulation time before cementing, and drilling can continue with the adjusted drilling parameters.

[0058] Repeat step four: The cumulative amount of rock cuttings accumulated inside the wellbore can be calculated using the formula: =Vd1+Vd2=0.68+1.36=2.04m 3 , Due to 1.41m 3 <2.04m 3If this is the case, it can be determined that the cumulative amount of cuttings accumulated in the wellbore cannot be completely removed within the effective circulation time before cementing. In this case, drilling parameters need to be adjusted, specifically, the drilling speed should be adjusted to 120 rpm and the flow rate to 32 L / s. At the same time, the cuttings return rate after adjustment should be measured: 12 minutes after collecting cuttings, the fluid level rises to the preset value. The cuttings return rate can be calculated using the formula: Qf = ΔV / t1 = 0.0525 / 0.2 = 0.263m 3 / min.

[0059] Simultaneously, the amount of cuttings returned during the effective circulation time before cementing is calculated as follows: =2.12m 3 Due to 2.12m 3 >2.04m 3 If so, it can be determined that the cumulative amount of rock cuttings accumulated in the wellbore can be completely discharged within the effective circulation time before cementing, and at this time, the adjusted drilling parameters can be maintained for drilling.

[0060] Then repeat steps two through four above for the second time: Repeat step two: the third shift has a mechanical drilling rate of v=20m / h, a pure drilling time of tc=240min, a drilling pump circulation time of tx=300min, and a drilling footage of 80m.

[0061] The cuttings return rate was measured: After collecting cuttings for 12 minutes, the liquid level rose to a preset value. The cuttings return rate was calculated using the formula Qf = ΔV / t1 = 0.0525 / 0.2 = 0.263 m / s². 3 / min.

[0062] The amount of cuttings accumulated in the wellbore during the current shift can be calculated using the formula: =-0.29m 3 .

[0063] Repeat step three: The amount of cuttings returned during the effective circulation time before cementing can be calculated using the formula: =2.12m 3 ; Due to 2.12m 3 >-0.29m 3 If so, it can be determined that the rock cuttings accumulated in the wellbore of the current shift can be completely removed within the effective circulation time before cementing, and drilling can continue with the adjusted drilling parameters.

[0064] Repeat step four: The cumulative amount of rock cuttings accumulated inside the wellbore can be calculated using the formula: =Vd1+Vd2+Vd3=0.68+ 1.36-0.29=1.75m 3 ; Due to 2.12m 3 >1.75m 3 If so, it can be determined that the cumulative amount of rock cuttings accumulated in the wellbore can be completely discharged within the effective circulation time before cementing, and at this time, the adjusted drilling parameters can be maintained for drilling.

[0065] Then repeat steps two through four for the third time: Repeat step two: The fourth shift has a mechanical drilling rate of v=30m / h, a pure drilling time of tc=300min, a drilling pump circulation time of tx=300min, and a drilling footage of 150m.

[0066] The cuttings return rate was measured: After collecting cuttings for 11 minutes, the liquid level rose to a preset value. The cuttings return rate was calculated using the formula Qf = ΔV / t1 = 0.0525 / 0.183 = 0.286 m / s². 3 / min.

[0067] The amount of cuttings accumulated in the wellbore during the current shift can be calculated using the formula: =0.49m 3 .

[0068] Repeat step three: The amount of cuttings returned during the effective circulation time before cementing can be calculated using the formula: =2.31m 3 ; Due to 2.31m 3 >0.49m 3 If so, it can be determined that the rock cuttings accumulated in the wellbore of the current shift can be completely removed within the effective circulation time before cementing, and drilling can continue with the adjusted drilling parameters.

[0069] Repeat step four: The cumulative amount of rock cuttings accumulated inside the wellbore can be calculated using the formula: =Vd1+Vd2+Vd3+Vd4=0.68+1.36-0.29+0.49=2.24m 3 , Due to 2.31m 3 >2.24m 3 If so, it can be determined whether the cumulative amount of rock cuttings in the wellbore can be completely discharged within the effective circulation time before cementing. At this time, the adjusted drilling parameters can be maintained for drilling.

[0070] Then repeat steps two through four for the fourth time: Repeat step two: The fifth shift had a mechanical drilling rate of v=25m / h, a pure drilling time of tc=260min, a drilling pump circulation time of tx=260min, and a drilling footage of 108.3m.

[0071] The cuttings return rate was measured: After collecting cuttings for 12 minutes, the liquid level rose to a preset value. The cuttings return rate was calculated using the formula Qf = ΔV / t1 = 0.0525 / 0.2 = 0.263 m / s². 3 / min.

[0072] The amount of cuttings accumulated in the wellbore during the current shift can be calculated using the formula: =0.25m 3 .

[0073] Repeat step three: The amount of cuttings returned during the effective circulation time before cementing can be calculated using the formula: =2.12m 3 ; Due to 2.12m 3 >0.25m 3 If so, it can be determined that the rock cuttings accumulated in the wellbore of the current shift can be completely removed within the effective circulation time before cementing, and drilling can continue with the adjusted drilling parameters.

[0074] Repeat step four: The cumulative amount of rock cuttings accumulated inside the wellbore can be calculated using the formula: =Vd1+Vd2+Vd3+Vd4+Vd5=0.68+ 1.36-0.29+0.49+0.25=2.49m 3 Due to 2.12m 3 <2.49m 3 If this is the case, it can be determined that the cumulative amount of cuttings accumulated in the wellbore cannot be completely removed within the effective circulation time before cementing. In this case, drilling parameters need to be adjusted, specifically, the drilling speed should be adjusted to 140 rpm and the flow rate to 33 L / s. Simultaneously, the cuttings return rate should be measured: after collecting cuttings for 8 minutes, the fluid level should rise to the preset value. According to the formula, the cuttings return rate Qf = ΔV / t1 = 0.0525 / 0.133 = 0.394 m. 3 / min. The cuttings return rate during the effective circulation time before cementing can be calculated using the formula: =3.18m 3 .

[0075] Due to 3.18m 3 >2.49m 3If so, it can be determined that the cumulative amount of rock cuttings accumulated in the wellbore can be completely discharged within the effective circulation time before cementing, and at this time, the adjusted drilling parameters can be maintained for drilling.

[0076] Then repeat steps two through four for the fifth time: Repeat step two: The sixth shift had a mechanical drilling rate of v=28m / h, a pure drilling time of tc=315min, a drilling pump circulation time of tx=315min, and a drilling footage of 147m was obtained, completing the drilling.

[0077] The cuttings return rate was measured: After collecting cuttings for 8 minutes, the liquid level rose to a preset value. The cuttings return rate was calculated using the formula Qf = ΔV / t1 = 0.0525 / 0.133 = 0.394 m / s². 3 / min.

[0078] The amount of cuttings accumulated in the wellbore during the current shift can be calculated using the formula: =-0.19m 3 .

[0079] Repeat step three: The amount of cuttings returned during the effective circulation time before cementing can be calculated using the formula: =3.18m 3 ; Due to 3.18m 3 >-0.19m 3 If so, it can be determined that the rock cuttings accumulated in the wellbore during the effective circulation time before cementing can be completely removed, and the adjusted drilling parameters can be maintained for drilling.

[0080] Repeat step four: The cumulative amount of rock cuttings accumulated inside the wellbore can be calculated using the formula: =Vd1+Vd2+Vd3+Vd4+Vd5+Vd6=0.68+ 1.36-0.29+0.49+0.25-0.19=2.30m 3 Due to 3.18m 3 >2.30m 3 Therefore, it can be determined that the cumulative amount of cuttings accumulated in the wellbore can be completely discharged within the effective circulation time before cementing. At this time, the current drilling parameters can be maintained until cementing.

[0081] like Figure 2 This application also provides a drilling parameter adjustment device, comprising: The effective cycle time acquisition module 10 is used to acquire the effective cycle time before cementing based on the drilling data of the completed drilling blocks. The cuttings return rate measurement module 20 is used to measure the cuttings return rate using a cuttings return rate measurement device; Current drilling parameter acquisition module 30 is used to acquire the current drilling parameters; The cuttings return amount acquisition module 40 is used to substitute the effective cycle time and the cuttings return rate into the cuttings return amount expression to obtain the cuttings return amount; The current cuttings accumulation module 50 is used to substitute the cuttings return rate and the drilling parameters into the cuttings accumulation expression to obtain the current cuttings accumulation. The drilling parameter adjustment module 60 is used to adjust the drilling parameters according to the relationship between the amount of cuttings returned and the amount of cuttings accumulated.

[0082] The drilling parameter adjustment device provided in this application can perform the drilling parameter adjustment method described above.

[0083] This application relates to a drilling parameter adjustment method and device that is simple to operate and low in cost; it can meet the annulus clearance requirements before cementing horizontal wells, and at the same time reduce the risk of obstruction during casing running before cementing, providing good wellbore conditions for cementing; it can be extended to the optimization of drilling parameters for horizontal wells and provide a basis for the selection of drilling equipment.

[0084] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0085] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for adjusting drilling parameters, characterized in that, The method includes the following steps: The effective circulation time before cementing is obtained from the drilling data of the completed well blocks; The cuttings return rate is measured using a cuttings return rate measuring device. The device chamber is installed below the drilling fluid vibrating screen. The device timer is started to collect the cuttings. The cuttings returned from the drilling fluid vibrating screen fall into the screen box, and the liquid level in the chamber gradually rises. The liquid level data is collected in real time by the liquid level controller and stored in the electronic memory. When the liquid level rises to the set height, the liquid level controller issues an instruction to record the time point separately and displays the time point, the increase in volume in the chamber corresponding to the liquid level, and the return rate of the cuttings. Obtain the current drilling parameters; Substitute the effective cycle time and the cuttings return rate into the cuttings return amount expression to obtain the cuttings return amount; Substitute the cuttings return rate and the drilling parameters into the cuttings accumulation expression to obtain the current cuttings accumulation; Adjust drilling parameters according to the relationship between the amount of cuttings returned and the amount of cuttings accumulated; The expression for the amount of rock debris accumulation is as follows: ； in, Indicates the amount of rock debris accumulation. This indicates the current mechanical drilling speed. Indicates the current pure diamond time. Pi is a constant. Indicates the current porosity of the block. This indicates the current block well diameter enlargement rate. This indicates the current wellbore diameter. This indicates the number of vibrating screens currently running simultaneously. Indicates the rate of rock cuttings return. This indicates the current pump start-up cycle time.

2. The drilling parameter adjustment method according to claim 1, characterized in that, The process of obtaining the effective circulation time before cementing based on drilling data from completed well blocks includes the following steps: Obtain drilling data from several blocks that have been drilled. Filter all single-well cycle times from the drilling data; Calculate the average of all the single-well circulation times; The average value is taken as the effective cycle time.

3. The drilling parameter adjustment method according to claim 1, characterized in that, The process of obtaining the current drilling parameters includes the following steps: Obtain the current mechanical drilling rate, wellbore diameter, pure drilling time, pump circulation time, number of vibrating screens started simultaneously, block well diameter enlargement rate, and block porosity.

4. The drilling parameter adjustment method according to claim 1, characterized in that, The expression for the amount of rock cuttings returned is: ； in, Indicates the amount of rock cuttings returned. Indicates the rate of rock cuttings return. Indicates the effective cycle time.

5. The drilling parameter adjustment method according to claim 1, characterized in that, The step of adjusting drilling parameters based on the relationship between the amount of cuttings returned and the amount of cuttings accumulated includes the following steps: Determine whether the amount of rock cuttings returned is greater than the amount of rock cuttings accumulated; If so, maintain the current drilling parameters; If not, adjust the drilling parameters and return to the step of measuring the cuttings return rate using the cuttings return rate measuring device.

6. The drilling parameter adjustment method according to claim 1, characterized in that, It also includes the following steps: The cumulative amount of rock debris is obtained by summing up all the aforementioned rock debris accumulations. Adjust drilling parameters based on the relationship between the amount of cuttings returned and the cumulative amount of cuttings accumulated.

7. The drilling parameter adjustment method according to claim 6, characterized in that, The expression for the cumulative accumulation of rock cuttings is: ； in, This indicates the cumulative amount of rock debris. This represents the amount of rock debris accumulated in the nth calculation. Indicates the serial number.

8. The drilling parameter adjustment method according to claim 6, characterized in that, The step of adjusting drilling parameters based on the relationship between the amount of cuttings returned and the cumulative amount of cuttings accumulated includes the following steps: Determine whether the amount of rock cuttings returned is greater than the cumulative amount of rock cuttings accumulated; If so, maintain the current drilling parameters; If not, adjust the drilling parameters and return to the step of measuring the cuttings return rate using the cuttings return rate measuring device.

9. A drilling parameter adjustment device, characterized in that, The drilling parameter adjustment method as described in any one of claims 1-8 includes: The effective cycle time acquisition module is used to acquire the effective cycle time before cementing based on the drilling data of the completed drilling blocks. The cuttings return rate measurement module is used to measure the cuttings return rate using a cuttings return rate measurement device. The current drilling parameter acquisition module is used to acquire the current drilling parameters; The cuttings return amount acquisition module is used to substitute the effective cycle time and the cuttings return rate into the cuttings return amount expression to obtain the cuttings return amount; The current cuttings accumulation module is used to substitute the cuttings return rate and the drilling parameters into the cuttings accumulation expression to obtain the current cuttings accumulation. The drilling parameter adjustment module is used to adjust the drilling parameters according to the relationship between the amount of cuttings returned and the amount of cuttings accumulated.

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