Carbon dioxide geological sequestration drilling and coring method

Abstract

The embodiment of the invention discloses a carbon dioxide geological sequestration drilling coring method which comprises the steps that the position of a coring layer section is determined according to the structure of a geological stratum; after drilling to a coring layer section, a coring drilling tool is put down, and the well bottom is cleaned before the coring drilling tool makes contact with the well bottom; the bit pressure of the coring drilling tool is adjusted to be 5 KN to 10 KN, and the coring drilling tool drills downwards by 0.25 m to 0.35 m; then the bit pressure of the coring drilling tool is adjusted to the designed bit pressure so as to continue drilling downwards, and the designed bit pressure is larger than 10 KN and smaller than 50 KN till drilling to the preset depth; a core cutting drilling tool is lifted to pull the core for core cutting; drilling is conducted, and drilling fluid is poured into the well in the drilling process till the coring drilling tool is pulled out. According to the carbon dioxide geological storage well drilling coring method, it can be guaranteed that the coring drilling tool has the continuous and stable drilling speed by controlling the drilling parameters of the coring drilling tool, the straightness of a rock core is guaranteed, core grinding is avoided, and therefore the coring efficiency and the coring yield are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of carbon dioxide storage, and particularly relates to a carbon dioxide geological storage drilling coring method. BACKGROUND

[0002] Carbon dioxide storage is a technology for responding to the influence of greenhouse gas emission on climate change, and aims to safely store carbon dioxide generated in industry to prevent it from entering the atmosphere. Among them, geological storage is the main storage technology of carbon dioxide storage technology. By compressing and injecting carbon dioxide gas into underground geological layers, carbon dioxide will be absorbed and stored in the underground for a long time to prevent it from entering the atmosphere.

[0003] In order to obtain accurate reservoir and cap rock physical property data, and to provide the required analysis data for carbon dioxide storage geological research, it is necessary to core the target layer. The drilling depth of carbon dioxide storage is usually 2000m to 3000m, or even 4000m, and there is great difficulty in the coring process. The method in the related art will result in low coring recovery rate. SUMMARY

[0004] The present application aims to at least partially solve one of the technical problems in the related art.

[0005] To this end, an embodiment of the present application proposes a carbon dioxide geological storage drilling coring method, which can improve the coring efficiency and the coring recovery rate.

[0006] The carbon dioxide geological storage drilling coring method of the present application embodiment comprises:

[0007] S1, determining the position of the coring layer section according to the structure of the geological stratum;

[0008] S2, after drilling into the coring layer section, lowering the coring drilling tool, and cleaning the bottom of the well before the coring drilling tool contacts the bottom of the well;

[0009] S3, adjusting the drilling pressure of the coring drilling tool to 5KN to 10KN, and drilling downward by 0.25m to 0.35m;

[0010] S4, adjusting the drilling pressure of the coring drilling tool to the designed drilling pressure to continue drilling downward, the designed drilling pressure being greater than 10KN and less than 50KN, until drilling to the preset depth;

[0011] S5, the coring drill is lifted to pull out the core, if the lifting load does not increase or increases and then decreases, the coring is successful, if the lifting load increases to 80KN to 130KN and still does not decrease, the rotary table is started under the tensile state of the core, and the lifting load is gradually increased, if the lifting load increases and then decreases, the coring is completed, if the lifting load increases to 200KN to 300KN and still does not decrease, the coring drill is started to drill down 0.1m to 0.2m, and the step is repeated to coring;

[0012] S6, the drilling is started, and drilling fluid is injected into the well during the drilling, until the coring drill is pulled out.

[0013] The carbon dioxide geological storage coring method can ensure continuous and stable drilling speed of the coring drill by controlling drilling parameters of the coring drill, ensure the straightness of the core, avoid core grinding, and thus improve the coring efficiency and the core recovery rate.

[0014] In some embodiments, the geological formation includes one or more of the Zhacangou group, the Shangshangou group, the Liujiaogou group and the Shiqianfeng group, and the coring interval is a sandstone reservoir and / or an upper cap rock in the corresponding geological formation, when coring, the coring length of the upper cap rock is 2m to 3m, the coring length of the sandstone reservoir is not more than 7m, and the coring is ended when drilling or the lithology changes.

[0015] When the coring interval is multiple, the coring operation is performed respectively.

[0016] In some embodiments, the method further comprises:

[0017] S7, the sandstone reservoir and the upper cap rock in the geological formation during drilling are obtained, and the missed sandstone reservoir or the upper cap rock is cored from the well wall.

[0018] In some embodiments, in step S2, when the distance between the coring drill and the bottom of the well is the length of a single drill rod, a square drill rod is connected to the drill string, the coring drill is moved up and down and rotated, and the well bottom is cleaned by circulating the drilling fluid.

[0019] In some embodiments, in step S4, the coring drill obtains a drilling time parameter every 0.4m to 0.6m of downward drilling, and the drilling parameters of the coring drill are adjusted according to the drilling time parameter to control the drilling time within a first threshold range.

[0020] In some embodiments, in step S4, the drilling rotation speed of the coring drill is 50r / min to 60r / min, the drilling displacement of the coring drill is 20L / s to 22L / s, and the drilling pressure of the coring drill is 40KN to 50KN.

[0021] In some embodiments, in step S5, when the weight of the up-lifting increases and then decreases, the coring drill 2m to 3m is up-lifted, and then lowered to the bottom of the well to determine whether the resistance is encountered, and if not, the coring is successful.

[0022] In some embodiments, in step S5, when the coring drill is started to drill down 0.1m to 0.2m, the drilling rotation speed of the coring drill is 30r / min to 38r / min, the drilling displacement of the coring drill is 15L / s to 20L / s, and the drilling pressure of the coring drill is 20KN to 30KN.

[0023] In some embodiments, in step S6, after the coring drill is pulled out, the core is packaged to prevent the gas and water in the core from escaping, and the core is sealed for testing.

[0024] In some embodiments, the coring drill includes a coring barrel, and the inner diameter of the coring barrel is 95mm to 120mm. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a flow chart of the carbon dioxide geological storage drilling coring method of the embodiments of the present application. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0027] The carbon dioxide geological storage drilling coring method of the embodiments of the present application comprises:

[0028] S1, according to the structure of the geological stratum, the position of the coring interval is determined. When the position of the coring interval is determined, the drilling is first performed to a position 40 to 60m before the position of the coring interval, preferably, the drilling is performed to a position 50m before the position of the coring interval, the formation condition is strictly monitored by the geological logging engineer and the geological supervisor, and when the drilling speed significantly slows down or speeds up, the drilling should be stopped in time for observation. The geological structure of the current rock stratum is analyzed through the data parameters such as the well depth and the drilling parameters, and if it is confirmed that the coring interval is drilled, the drilling needs to be performed for coring.

[0029] S2, after the drilling to the coring interval, the coring drill is lowered, and the bottom of the well is cleaned before the coring drill contacts the bottom of the well. The coring drill is moved, the washing fluid is disturbed and circulated to better carry out the debris and slag at the bottom of the well.

[0030] Preferably, the distance between the coring drill and the bottom of the well is the length of a single drill pipe, then a square drill pipe is connected to the drill string, which can increase the torque and facilitate subsequent direct driving of the coring drill to rotate and drill the core, the coring drill is moved up and down and driven to rotate, for example, the coring drill rotates at a speed of 20 to 40 r / min, the movement of the coring drill can increase the disturbance effect of the washing fluid on the gravel and sludge at the bottom of the well, improve the cleaning effect, and the washing fluid is circulated to clean the bottom of the well, the washing fluid is circulated for 2 to 4 weeks to ensure that the bottom of the well is clean.

[0031] S3, adjust the weight on bit of the coring drill to 5 to 10 KN, and drill down 0.25 to 0.35 m with the coring drill.

[0032] The weight on bit of the coring drill at this stage can be 5, 6, 6.5, 7.7, 9.3 or 10 KN, and the speed of the coring drill can be 40 to 50 r / min, which can ensure the straightness of the initial core and facilitate the guiding effect for subsequent drilling, avoid core grinding, improve the quality of the core, and avoid sticking or excessive resistance of the coring drill. When the drilling depth is less than 0.25 m, it is not easy to play a guiding effect, and when the drilling depth is greater than 0.35 m, the drilling time is longer, which affects the efficiency of drilling and easily affects the drilling parameters of the coring drill.

[0033] S4, adjust the weight on bit of the coring drill to the designed weight on bit to continue drilling down, the designed weight on bit is greater than 10 KN and less than 50 KN, until the drilling depth reaches the preset depth. In this process, uniform drilling is ensured, the weight on bit is adjusted according to the drilling condition, and the changes of the weight indicator and the pump pressure are observed when the weight on bit is applied, to ensure continuous drilling, continuous pumping and continuous rotary table.

[0034] S5, pull up the coring drill to pull out the core, if the uphole load does not increase or increases and then decreases, the coring is successful; if the uphole load increases to 80 to 130 KN and still does not decrease, the rotary table is started under the tension state of the core and the uphole load is gradually increased, if the uphole load increases and then decreases, the coring is completed, if the uphole load increases to 200 to 300 KN and still does not decrease, the coring drill is started to drill down 0.1 to 0.2 m, and the coring is repeated.

[0035] By analyzing the situation encountered during the process of pulling out the core, different countermeasures are taken to successfully cut the core, so as to ensure the smooth completion of the coring work, solve the problem of unsuccessful coring, avoid the stagnation of the coring work at this stage, and improve the efficiency of the coring operation.

[0036] S6, tripping out and pouring drilling fluid into the well during tripping out until the coring drill is tripped out. After the coring is completed, drilling fluid needs to be poured into the well to ensure that the core is smoothly taken out by using the buoyancy of the drilling fluid to avoid the coring drill and the core being suspended relative to the drilling fluid, and the drilling fluid should be ensured to be poured into the well at all times.

[0037] The carbon dioxide geological storage drilling coring method in the embodiment of the application can ensure that the coring drill has a continuous and stable drilling speed by controlling the drilling parameters of the coring drill, ensure the straightness of the core, and avoid core grinding, thereby improving the coring efficiency and the core recovery rate.

[0038] The following describes the carbon dioxide geological storage drilling coring method in another specific embodiment.

[0039] Step 1: Determine the position of the coring interval according to the structure of the geological formation.

[0040] The geological formation includes one or more of the Zhifanggou group, the Heshanggou group, the Liujiaogou group, and the Shiqianfeng group, that is, the carbon dioxide geological storage drilling coring method in the embodiment of the application can be applied to the Zhifanggou group, the Heshanggou group, the Liujiaogou group, and the Shiqianfeng group geological formation, and the actual geological formation structure can include a combination of one or more thereof. The coring interval is a sandstone reservoir and / or an upper cap rock in the corresponding geological formation, and the physical property analysis of the geological structure of the sandstone reservoir and the upper cap rock is particularly important according to the needs of carbon dioxide geological storage, which determines the storage capacity and the safety and stability of the storage, and therefore more accurate layer taking is required. When coring, the upper cap rock coring length is 2m to 3m, the sandstone reservoir coring is ended when the drilling time or the lithology changes, and the coring length is not greater than 7m; when the coring interval is multiple, coring operations are performed respectively.

[0041] When coring, the geologist decides the coring in real time according to the drilling time, the geological parameters, and the like.

[0042] For example, in a certain injection well, the Zhifanggou group well section depth is 2424-2885m, the Heshanggou group well section depth is 2885-3115m, the Liujiaogou group well section depth is 3115-3450m, and the Shiqianfeng group well section depth is 3450-3877m, the middle and lower sandstone reservoir and the upper cap rock are taken in the Zhifanggou group, the sandstone reservoir and the cap rock are taken in the Heshanggou group, the sandstone reservoir is taken in the Liujiaogou group, and the sandstone reservoir is taken in the Shiqianfeng group. During the entire drilling process, the carbon dioxide geological storage drilling coring method in the embodiment of the application is used to core each coring interval.

[0043] Step two: after drilling into the coring section, the coring drilling tool is lowered, and the bottom hole is cleaned before the coring drilling tool contacts the bottom hole. The coring drilling tool includes a coring barrel, and the inner diameter of the coring barrel is 95mm to 120mm. For example, the inner diameter of the coring barrel is 95mm, 100mm, 101mm, 102mm, 108mm or 120mm.

[0044] Step three: the drilling pressure of the coring drilling tool is adjusted to 5KN to 10KN, and the coring drilling tool is drilled downward by 0.25m to 0.35m.

[0045] Step four: the drilling pressure of the coring drilling tool is adjusted to the designed drilling pressure to continue drilling downward, and the drilling time parameter is obtained every 0.4m to 0.6m of downward drilling of the coring drilling tool at the preset depth, and the drilling parameters of the coring drilling tool are adjusted according to the drilling time parameter to control the drilling time within a first threshold range. The drilling time is obtained every 0.4m, 0.45m or 0.6m of downward drilling of the coring drilling tool, and preferably, the drilling time is obtained every 0.5m of downward drilling of the coring drilling tool. When the drilling time is abnormal, the drilling time is controlled within a reasonable range by adjusting the parameters of the coring drilling tool to avoid core grinding, and the formation structure can be analyzed according to the drilling time, drilling parameters and other data to more accurately control the coring process and improve the coring efficiency.

[0046] During the drilling process, the drilling rotation speed of the coring drilling tool is 50r / min to 60r / min, and optionally, the drilling rotation speed is 50r / min, 530r / min, 54.2r / min, 55r / min, 58r / min or 60r / min. When the rotation speed is too slow, it is easy to cause the drilling time to be too long and cause core grinding and other adverse conditions. When the rotation speed is too fast, it is easy to cause the torque of the drill rod to be too large, the load of the power equipment to be too high, and the stability of the drilling to be affected, and problems such as bucking and jumping drilling are likely to occur.

[0047] The drilling displacement of the coring drilling tool is 20L / s to 22L / s, and optionally, the drilling displacement can be 20L / s, 20.3L / s, 20.5L / s, 21L / s, 21.6L / s or 22L / s. When the drilling displacement is too small, it is easy to cause the temperature of the coring drilling tool to be too high, the gravel and slag soil to be not quickly discharged, the working condition of the coring drilling tool to be deteriorated, and the service life of the coring drilling tool to be affected. When the drilling displacement is too large, it is easy to cause a large impact on the rock formation, damage the core structure, and cause the pump pressure to rise and the energy consumption to increase.

[0048] The drilling pressure of the coring drilling tool is 40KN to 50KN, and optionally, the drilling pressure of the coring drilling tool is 40KN, 44KN, 45KN, 47.5KN, 49KN or 50KN. When the drilling pressure of the coring drilling tool is too small, the drilling efficiency is affected, the drilling time is too long, and core grinding is likely to occur. When the drilling pressure of the coring drilling tool is too large, the coring drilling tool is likely to be damaged, and the straightness of the drilling is unstable.

[0049] Step five: the upper extraction core drill is pulled to pull out the core, if the upper lifting load does not increase or increases and then decreases, the core cutting is successful, if the upper lifting load increases to 80KN to 130KN and still does not decrease, the rotary table is started in the state that the core is pulled and the upper lifting load is gradually increased, if the upper lifting load increases and then decreases, the core cutting is completed, if the upper lifting load increases to 200KN to 300KN and still does not decrease, the core drill is started to drill down 0.1m to 0.2m, and the step is repeated to cut the core. When the core drill is started to drill down 0.1m to 0.2m, the drilling speed of the core drill is 30r / min to 38r / min, the drilling displacement of the core drill is 15L / s to 20L / s, and the drilling pressure of the core drill is 20KN to 30KN.

[0050] Further, when the upper lifting load increases and then decreases, the core drill is lifted up 2m to 3m, and then is lowered to the bottom of the well, whether the core drill is blocked is judged, if not, the core cutting is successful. That is to say, in order to further verify the success of the core cutting, the core drill is lifted up and lowered down to observe whether the core drill is blocked to ensure the success of the core cutting, the operation method needs a short time and does not affect the efficiency of the core taking, but can avoid the failure of the core cutting.

[0051] Step six: the drilling is started and the drilling fluid is injected into the well during the drilling process until the core drill is pulled out. After the core cutting is completed, the drilling fluid needs to be injected into the well to ensure that the core is smoothly taken out by using the buoyancy of the drilling fluid, and the core drill and the core are suspended relative to the drilling fluid, and the drilling fluid should be injected into the well at all times.

[0052] After the core drill is pulled out, the core is packaged to prevent the gas and water in the core from escaping, and the core is sealed for testing.

[0053] Step seven: the sandstone reservoir and the upper cap rock in the geological stratum during the drilling process are obtained, and the missed sandstone reservoir or the upper cap rock is taken by the sidewall coring. That is to say, after the drilling, if there is a missed sandstone reservoir or an upper cap rock, the corresponding core can be obtained by the sidewall coring to analyze the physical properties of the rock stratum at the corresponding position and supplement the data of the missed layer in the complex stratum.

[0054] The paperhouse group, the shangshangou group, the liujiagou group and the shiqianfeng group in the depth range covered by the carbon dioxide storage geology are cored to analyze the physical properties of the stratum structure and provide data support for the storage capacity, stability and safety of the carbon dioxide storage, the construction parameters of each step are determined, the core taking efficiency and the harvest rate are improved, and the effectiveness of the obtained core is ensured.

[0055] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0056] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated thereby. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0057] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0058] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0059] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terminology "comprising" is used in the disclosure as comprising but not limited to, that is, it is open-ended and does not exclude the presence of additional features, structures, materials, or characteristics.

[0060] Although the embodiments of the present disclosure have been shown and described above, it is understood that the above-described embodiments are exemplary, and are not to be interpreted as limiting the present disclosure, and the ordinary skilled in the art can make changes, modifications, replacements, and variations to the above-described embodiments within the scope of the present disclosure.

Claims

1. A method for coring carbon dioxide in geological storage wells, characterized in that, include: S1. Determine the location of the core section based on the structure of the geological strata; S2. After drilling to the core section, lower the core drilling tool and clean the bottom of the well before the core drilling tool contacts the bottom of the well. S3. Adjust the drilling pressure of the core drilling tool to 5KN to 10KN, and drill downwards by 0.25m to 0.35m; S4. Adjust the drilling pressure of the coring tool to the designed drilling pressure to continue drilling downwards. The designed drilling pressure is greater than 10KN and less than 50KN until the preset depth is reached. S5. Raise the core drilling tool to pull out the rock core. If the suspended weight does not increase or decreases after being increased, the core cutting is successful. If the suspended weight does not decrease after being increased to 80KN to 130KN, start the rotary table under the tension of the rock core and gradually increase the suspended weight. If the suspended weight decreases after being increased, the core cutting is completed. If the suspended weight does not decrease after being increased to 200KN to 300KN, start the core drilling tool to drill down 0.1m to 0.2m and repeat this step to cut the core. S6. Pull out the drill string and inject drilling fluid into the well during the pulling out process until the core drill string is pulled out.

2. The carbon dioxide geological storage drilling and coring method according to claim 1, characterized in that, The geological strata include one or more of the Zhifang Formation, Heshanggou Formation, Liujiagou Formation, and Shiqianfeng Formation. The cored section is the sandstone reservoir and / or upper caprock in the corresponding geological strata. When cored, the cored length of the upper caprock is 2m to 3m. Cored sandstone reservoir cored until drilling or when lithology changes, and the cored length is no more than 7m. When there are multiple coring segments, coring operations are performed separately for each segment.

3. The carbon dioxide geological storage drilling and coring method according to claim 2, characterized in that, Also includes: S7. Obtain sandstone reservoirs and overlying caprocks from the geological formations during the drilling process, and perform core sampling on any missed sandstone reservoirs or overlying caprocks.

4. The carbon dioxide geological storage drilling and coring method according to claim 1, characterized in that, In step S2, when the distance between the coring tool and the bottom of the well is equal to the length of a single drill pipe, a square drill pipe is attached to the drill string, and the coring tool is moved up and down and rotated to circulate the well-washing fluid to clean the bottom of the well.

5. The carbon dioxide geological storage drilling and coring method according to claim 1, characterized in that, In step S4, the coring drill bit acquires drilling time parameters every 0.4m to 0.6m of downward drilling, and adjusts the drilling parameters of the coring drill bit according to the drilling time parameters to control the drilling time within a first threshold range.

6. The carbon dioxide geological storage drilling and coring method according to claim 5, characterized in that, In step S4, the drilling speed of the core drilling tool is 50 r / min to 60 r / min, the drilling displacement of the core drilling tool is 20 L / s to 22 L / s, and the drilling pressure of the core drilling tool is 40 KN to 50 KN.

7. The carbon dioxide geological storage drilling and coring method according to claim 1, characterized in that, In step S5, when the suspended weight is increased and then lowered, the core drilling tool is raised by 2m to 3m and then lowered to the bottom of the well to determine whether it encounters resistance. If not, the core cutting is successful.

8. The carbon dioxide geological storage drilling and coring method according to claim 1, characterized in that, In step S5, when the coring drill is started to drill downwards by 0.1m to 0.2m, the drilling speed of the coring drill is 30r / min to 38r / min, the drilling displacement of the coring drill is 15L / s to 20L / s, and the drilling pressure of the coring drill is 20KN to 30KN.

9. The carbon dioxide geological storage drilling core sampling method according to claim 1, characterized in that, In step S6, after the core drilling tool is retrieved, the core is sealed to prevent gas and water from escaping from the core, and a sealing test is performed on the core.

10. The carbon dioxide geological storage drilling and coring method according to any one of claims 1 to 9, characterized in that, The coring tool includes a core tube with an inner diameter of 95 mm to 120 mm.

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