Polar region drilling fluid circulating system and polar region drilling integrated equipment

Abstract

The utility model relates to a polar region drilling fluid circulating system and polar region drilling integrated equipment. The system comprises a cooling assembly used for cooling drilling fluid. The injection assembly is arranged on a drilling fluid input pipeline, is connected with the cooling assembly and is used for injecting low-temperature drilling fluid into a drilling well so as to be matched with a drill bit for drilling; the solid-liquid separation assembly is connected with the injection assembly and is used for separating drilling fluid from ice chips or rock chips; and the parameter detection assembly is arranged at the output end of the injection assembly and is used for monitoring parameters of the drilling fluid entering a wellhead. The drill bit can be applied to drilling construction in extremely cold areas, has better cold resistance, stability and reliability, reduces accumulation of solid particles (ice chips and rock chips) in the drilling process, improves drilling efficiency, and reduces damage to the Antarctic environment to the maximum extent.

Description

Technical Field

[0001] The utility model relates to the technical field of polar drilling, in particular to a polar drilling fluid circulation system and polar drilling integrated equipment. Background Art

[0002] The ecosystem in the Antarctic region is very fragile. Once damaged, it may trigger a chain reaction and affect the global ecological balance. The geological conditions in Antarctica are complex. The ice layer is divided into a high-permeability granular snow layer, a brittle ice layer, a warm ice layer, and an ice-rock interlayer; the strata are divided into a complex ice-rock interface (meltwater, unfrozen moraine, etc.) and bedrock under the ice. The environmental conditions are harsh. The temperature in the inland area of ​​Antarctica is below -55℃, and the temperature in the ice layer ranges from -55℃ to -2℃. The construction time is only about 40 days a year. The stability of the borehole wall is poor, the granular snow layer is loose, the brittle ice layer is easy to collapse, the ice-warm layer has creep, and it is difficult to enter the rock at the ice-rock interface. Solid particles (ice chips, rock chips) are prone to accumulation during drilling, the drilling efficiency is low, and it is also easy to cause damage to the Antarctic environment. Utility Model Content

[0003] In view of this, the utility model proposes a polar drilling fluid circulation system and polar drilling integrated equipment, aiming to solve the problems existing in the prior art.

[0004] Specifically, the utility model provides a polar drilling fluid circulation system, comprising:

[0005] A cooling assembly for cooling the drilling fluid;

[0006] An injection assembly disposed on a drilling fluid input pipeline and connected to the cooling assembly for injecting low-temperature drilling fluid into the well to assist the drill bit in drilling;

[0007] a solid-liquid separation assembly connected to the injection assembly and used to separate drilling fluid from ice or rock cuttings;

[0008] and a parameter detection component arranged at the output end of the injection component for monitoring the parameters of the drilling fluid entering the wellhead.

[0009] Based on the above scheme, the cooling component includes an air cooler for exchanging heat with outdoor air to dissipate heat from the drilling fluid, a heat exchanger for heat exchange connected to the air cooler, and a circulating pump connected to the heat exchanger for transporting drilling fluid from the injection component to the heat exchanger.

[0010] Based on the above scheme, the solid-liquid separation component includes: a sewage pump connected to the drill pipe for discharging impurities discharged from the drill pipe, a vibrating screen connected to the sewage pump for achieving solid-liquid material separation, and a vertical centrifuge connected to the vibrating screen for achieving solid-liquid separation to guide the output of drilling fluid and rock cuttings or ice chips.

[0011] Based on the above solution, the solid-liquid separation component further includes: a sediment tank for collecting solid waste.

[0012] Based on the above solution, the injection component includes:

[0013] a drilling fluid collection tank connected to the heat exchanger for storing drilling fluid;

[0014] a stirrer provided on the drilling fluid collection tank;

[0015] a cryogenic piston pump connected to the drilling fluid collection tank for transporting drilling fluid;

[0016] an accumulator provided on the output pipeline connected to the cryogenic piston pump for stabilizing and balancing the pressure of the drilling fluid;

[0017] and a pressure relief valve provided on the output pipeline connected to the accumulator and connected to the other end of the pump head of the cryogenic piston pump for pressure relief.

[0018] Based on the above solution, it further includes: a container for integrally installing the polar drilling fluid circulation system.

[0019] Based on the above solution, sleds for sliding are provided at the bottom of the container.

[0020] In addition, the present utility model further provides a polar drilling integrated device for polar ice layer drilling, including:

[0021] the above-mentioned polar air drilling circulation integrated system for primary drilling in the borehole;

[0022] a polar drilling fluid circulation system for secondary drilling in the borehole to complete core drilling;

[0023] a polar drilling rig power integration system for providing power support for the polar drilling fluid circulation system and the polar drilling fluid circulation system;

[0024] and a drilling rig system for completing core drilling in cooperation with the polar air drilling circulation integrated system, the polar drilling fluid circulation system, and the polar drilling rig power integration system.

[0025] The utility model mainly consists of a cooling component, an injection component, a solid-liquid separation component and a parameter detection component. The cooling component cools the drilling well; the injection component injects the cooled drilling fluid into the bottom of the well; the solid-liquid separation component can separate the drilling fluid from ice chips and rock cuttings; the parameter detection component is used to monitor the key parameters of the drilling fluid entering the wellhead, including a thermometer, a pressure gauge, a flow meter and a liquid level gauge. A drilling fluid circulation integration system that can recycle drilling fluid and precisely control the flow rate and flow direction of drilling fluid is developed for the extreme environment in Antarctica. The system adopts advanced filtration and purification separation technologies to reduce the accumulation of solid particles (ice chips and rock cuttings) during drilling, improve the drilling efficiency, and minimize the damage to the Antarctic environment. The application of the utility model can realize functions such as the stability of the wellbore, the balance of formation pressure, the carrying and suspension of drill cuttings, and the cooling and lubrication of the drill bit and drill string, which is the basic guarantee for drilling to the subglacial bedrock and successfully coring. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the utility model. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0027] Figure 1 It is a schematic structural diagram of the polar drilling fluid circulation system in Embodiment 1 (showing the solid-liquid separation component);

[0028] Figure 2 It is a schematic structural diagram of the polar drilling fluid circulation system in Embodiment 1;

[0029] Figure 3 It is a schematic structural diagram of the polar drilling integrated equipment in Embodiment 2. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0031] Embodiment 1

[0032] As Figure 1 - Figure 2As shown in the figure, the present application provides a specific implementation manner of a polar drilling fluid circulation system. The polar drilling fluid circulation system 2 includes a cooling assembly 2-1 for cooling the drilling fluid, an injection assembly 2-2 disposed on the drilling fluid input pipeline and connected to the cooling assembly 2-1 for injecting low-temperature drilling fluid into the bottom of the well to cooperate with the drill bit for drilling, and a solid-liquid separation assembly 2-3 connected to the injection assembly 2-2 for separating the drilling fluid from ice chips or cuttings.

[0033] As a specific embodiment of the polar drilling fluid circulation system 2, it further includes: a parameter detection assembly 2-4 disposed at the output end of the injection assembly 2-2 for monitoring key parameters of the drilling fluid entering the wellhead. The parameter detection assembly 2-4 includes a first thermometer, a pressure gauge, a flow meter, and a liquid level gauge.

[0034] Among them, the cooling assembly 2-1 includes an air cooler 2-1-1, a heat exchanger 2-1-2, and a circulation pump 2-1-3.

[0035] The injection assembly 2-2 includes: a drilling fluid collection tank 2-2-1 connected to the heat exchanger 2-1-2 for storing the drilling fluid, a stirrer 2-2-2 disposed on the drilling fluid collection tank 2-2-1, a low-temperature plunger pump 2-2-3 connected to the drilling fluid collection tank 2-2-1 for transporting the drilling fluid, an accumulator 2-2-4 disposed on the output pipeline connected to the low-temperature plunger pump 2-2-3 for stabilizing and balancing the pressure of the drilling fluid, and a pressure relief valve 2-2-5 disposed on the output pipeline connected to the accumulator 2-2-4 and the other end of the pump head of the low-temperature plunger pump 2-2-3 for pressure relief.

[0036] During operation, the drilling fluid separated by solid control enters the drilling fluid collection tank 2-2-1. The drilling fluid in the drilling fluid collection tank 2-2-1 is sent through the pipeline by the circulation pump 2-1-3 into the heat exchanger 2-1-2. The drilling fluid and the refrigerant of the air cooler 2-1-1 exchange heat in the heat exchanger 2-1-2. The air cooler 2-1-1 takes away the heat of the drilling fluid through the heat exchanger 2-1-2 to cool the drilling fluid. After continuous cyclic cooling, the final temperature of the drilling fluid ≤ -2 °C (the set range can be -20 to 0 °C). It flows from the heat exchanger 2-1-2 through the pipeline into the drilling fluid collection tank 2-1-1. Chemical agents can be added to the drilling fluid collection tank 2-1-1 according to the needs of drilling. After being stirred evenly by the stirrer 2-2-2, it is injected into the well.

[0037] As Figure 1As shown in the figure, as a specific implementation, the solid-liquid separation assembly 2-3 includes: a sewage pump 2-3-1 connected to the drill pipe for discharging impurities discharged from the drill pipe, a vibrating screen 2-3-2 connected to the sewage pump 2-3-1 for separating solid-liquid materials, and a vertical centrifuge 2-3-3 connected to the vibrating screen 2-3-2 for realizing solid-liquid separation to guide the drilling fluid (returning to the drilling fluid collection tank 2-1-1) and cuttings or ice chips (output to the cutting bucket and ice chip bucket) to be output. Among them, the drilling fluid screened by the vibrating screen 2-3-2 and the vertical centrifuge 2-3-3 is connected to the heat exchanger 2-1-2 through a pipeline and a circulation pump 2-1-3 via the drilling fluid output pipeline. After heat exchange, it is again injected into the bottom of the well with low-temperature drilling fluid through a low-temperature plunger pump 2-2-3 and a pipeline through the drilling fluid input pipeline.

[0038] It also includes: a sediment tank 2-3-4 for collecting solid waste. The drilling fluid coming out of the wellhead precipitates in the sediment tank 2-3-4 and is then pumped to the vibrating screen 2-3-2 by the sewage pump 2-3-1. The sediment tank 2-3-4 is a necessary part for the positive circulation of the drilling fluid; for the reverse circulation of the drilling fluid, it does not pass through the sediment tank 2-3-4 and directly goes from the wellhead to the vibrating screen 2-3-2. The ice chips and cuttings coming out of the vibrating screen 2-3-2 and the vertical centrifuge 2-3-3 slide or accumulate into the ice (cuttings) tank.

[0039] The installation positions of the above-mentioned cooling assembly 2-1, injection assembly 2-2 and solid-liquid separation assembly 2-3 in the box can be changed according to the actual situation.

[0040] The polar drilling fluid circulation system 2 is a supporting system used during drilling operations in the polar environment, and its design and functions take into account the special conditions of the polar environment. This system has better cold resistance, stability and reliability, and can be applied to drilling construction in extremely cold regions.

[0041] Intelligent control is an important means to improve the performance of the polar system device. By integrating technologies such as sensors, controllers, and communications, real-time monitoring, automatic adjustment and remote control of the system can be achieved. Intelligent control can reduce maintenance costs and save manpower, and improve the operating efficiency of the system. Among them, means such as remote control can adopt conventional means of existing technologies, which are not the innovation points of the present utility model and will not be elaborated here.

[0042] The polar drilling fluid circulation drilling technology is applicable to ice-rock interfaces and bedrock drilling. With the cooperation of low-temperature drilling fluid and the drilling fluid circulation system, functions such as wellbore stability, formation pressure balance, cuttings carrying and suspension, and cooling and lubrication of the drill bit and drill string can be realized, ensuring that drilling can reach the sub-ice bedrock and thus successfully obtaining cores.

[0043] Embodiment 2

[0044] Based on the device in Embodiment 1, the present application provides a specific implementation manner of an integrated polar drilling equipment.

[0045] As Figure 3 shown, an integrated polar drilling equipment for polar ice layer drilling includes:

[0046] The polar air drilling circulation integrated system 1 for primary drilling in a borehole;

[0047] The polar drilling fluid circulation system 2 for secondary drilling in the borehole to complete core drilling;

[0048] The polar drilling site power integrated system 3 for providing power support for the polar air drilling circulation integrated system 1 and the polar drilling fluid circulation system 2;

[0049] And a drilling rig system 7 for completing core drilling in cooperation with the polar air drilling circulation integrated system 1, the polar drilling fluid circulation system 2, and the polar drilling site power integrated system 3.

[0050] As Figure 3 shown, specifically, the polar air drilling circulation integrated system 1, the polar drilling fluid circulation system 2, and the polar drilling site power integrated system 3 are respectively integrated in containers and applied in Antarctica. Specifically, an integrated polar drilling equipment includes a first container structure 4, a second container structure 5, and a third container structure 6. The polar air drilling circulation integrated system 1 in Embodiment 1 is arranged in the first container structure 4, the polar drilling fluid circulation system 2 in Embodiment 1 is arranged in the second container structure 5, the polar drilling site power integrated system 3 in Embodiment 1 is arranged in the third container structure 6, a sled structure for transportation and movement on snow or ice is arranged at the bottom of the container structure, and a heater is arranged inside the container for heating to keep the equipment at the operating temperature. (The sled structure and the heater are not shown in the figure)

[0051] The polar drilling fluid circulation system is integrated in a 20-foot container structure and fixed on a sled for transportation;

[0052] The main design objectives of the polar drilling fluid circulation integrated system are as follows:

[0053] Name Index Quantity of Low - temperature Drilling Fluid Circulation System 1 set Temperature of Drilling Fluid at Cooler Outlet Not higher than - 2°C Flow Rate 100 L / min Pressure 2 MPa Low - temperature Resistance of Equipment ≤ - 45°C (Overwintering in Antarctica) Volume Can be Integrated into a 20 - foot Container Weight Single - unit Transportation Weight not Exceeding 4 t

[0054] The integrated technology of polar drilling fluid circulation system is the core technology system for efficient drilling operations under extremely cold conditions, covering multiple aspects such as the design and integration of drilling fluid circulation system, solids control and purification system, and the establishment of integrated intelligent monitoring and control system. The application of this technology can achieve functions such as wellbore stability, formation pressure balance, cuttings carrying and suspension, and cooling and lubrication of drill bits and drill tools, which is the basic guarantee for drilling to the subglacial bedrock and successfully coring.

[0055] The utility model develops a drilling fluid circulation integration system that can recycle drilling fluid and precisely control the flow rate and direction of drilling fluid for the extreme environment in Antarctica. This system adopts advanced filtration and purification separation technology to reduce the accumulation of solid particles (ice chips, cuttings) during drilling, improve drilling efficiency, and minimize the damage to the Antarctic environment. The system mainly consists of a cooling component 2-1, an injection component 2-2, a solid-liquid separation component 2-3, and a parameter detection component 2-4. The cooling component 2-1 cools the drilling fluid; the injection component 2-2 injects the cooled drilling fluid into the bottom of the well; the solid-liquid separation component 2-3 can separate the drilling fluid from ice chips and cuttings; the parameter detection component 2-4 is used to monitor the key parameters of the drilling fluid entering the wellhead, including thermometer, pressure gauge, flow meter, and liquid level gauge.

[0056] Obviously, those skilled in the art can make various changes and modifications to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and its equivalent technologies, the utility model is also intended to include these changes and modifications.

Claims

1. A polar drilling fluid circulation system, characterized in that: include: A cooling assembly (2-1) for cooling drilling fluid; An injection assembly (2-2) disposed on a drilling fluid input pipeline and connected to the cooling assembly (2-1) for injecting low-temperature drilling fluid into the well to assist the drill bit in drilling; A solid-liquid separation component (2-3) connected to the injection component (2-2) and used for separating drilling fluid from ice or rock chips; and a parameter detection component (2-4) arranged at the output end of the injection component (2-2) for monitoring the parameters of the drilling fluid entering the wellhead.

2. The polar drilling fluid circulation system according to claim 1, characterized in that: The cooling component (2-1) comprises an air cooler (2-1-1) for exchanging heat with outdoor air to dissipate heat from drilling fluid, a heat exchanger (2-1-2) connected to the air cooler (2-1-1) for heat exchange, and a circulation pump (2-1-3) connected to the heat exchanger (2-1-2) for conveying drilling fluid from the injection component (2-2) to the heat exchanger (2-1-2).

3. The polar drilling fluid circulation system according to claim 1 or 2, characterized in that: The solid-liquid separation component (2-3) comprises: a sewage pump (2-3-1) connected to a drill pipe and used to discharge impurities discharged from the drill pipe, a vibrating screen (2-3-2) connected to the sewage pump (2-3-1) and used to separate solid and liquid materials, and a vertical centrifuge (2-3-3) connected to the vibrating screen (2-3-2) and used to separate solid and liquid to guide the output of drilling fluid and rock or ice chips.

4. The polar drilling fluid circulation system according to claim 3, characterized in that: The solid-liquid separation component (2-3) also includes a sediment tank (2-3-4) for collecting solid waste.

5. The polar drilling fluid circulation system according to claim 2, characterized in that: The injection assembly (2-2) comprises: A drilling fluid collection tank (2-2-1) connected to the heat exchanger (2-1-2) and used for storing drilling fluid; an agitator (2-2-2) arranged on the drilling fluid collection tank (2-2-1); A low-temperature plunger pump (2-2-3) connected to the drilling fluid collection tank (2-2-1) and used for conveying drilling fluid; An accumulator (2-2-4) for stabilizing and balancing drilling hydraulic pressure is arranged on an output pipeline connected to the low-temperature plunger pump (2-2-3); A pressure relief valve (2-2-5) for pressure relief is provided on an output pipeline connected to the accumulator (2-2-4) and is connected to the other end of the pump head of the low-temperature plunger pump (2-2-3).

6. The polar drilling fluid circulation system according to claim 1, characterized in that: Also includes: Container for integrated installation of polar drilling fluid circulation system.

7. The polar drilling fluid circulation system according to claim 6, characterized in that: A sled for sliding is arranged at the bottom of the container.

8. A polar drilling integrated equipment for polar ice drilling, characterized in that: include: An integrated arctic air drill circulation system (1) for performing a single drilling pass in a borehole; A polar drilling fluid circulation system (2) as claimed in any one of claims 1 to 7 for performing secondary drilling in a borehole to complete drilling and coring; A polar drilling site power integration system (3) for providing power support for a polar air drilling circulation integration system (1) and a polar drilling fluid circulation system (2); and a drilling rig system (7) for completing drilling and coring, which is used in conjunction with the polar air drilling circulation integrated system (1), the polar drilling fluid circulation system (2), and the polar drilling field power integrated system (3).

Images