阅读说明：本技术 钻井平台热量供应系统 (Heat supply system of drilling platform ) 是由 王雪瑞 孙宝江 王志远 高永海 李�昊 于 2020-11-18 设计创作，主要内容包括：本发明提供一种钻井平台热量供应系统,包括水箱,固控设备,以及钻井泵,所述水箱内设有盘管,所述盘管包括进口管线和出口管线,所述进口管线与所述固控设备连接,所述出口管线与所述钻井泵连接。本发明所述的钻井平台热量供应系统,在钻井液循环体系中加入了一个可以进行换热的盘管,并将盘管放置于水箱内,使得水箱内的液体通过所述盘管与钻井液进行热交换,充分利用钻井过程中的地热能对水箱内的液体进行加热,有效的缓解了极地钻井后勤保障的困难,降低了极地钻井后勤保障的成本,且仅需增加盘管和相应的水箱即可,占用空间小,且热量来源于地热能,节能环保。(The invention provides a drilling platform heat supply system which comprises a water tank, a solid control device and a drilling pump, wherein a coil is arranged in the water tank, the coil comprises an inlet pipeline and an outlet pipeline, the inlet pipeline is connected with the solid control device, and the outlet pipeline is connected with the drilling pump. According to the heat supply system of the drilling platform, the coil pipe capable of exchanging heat is added into the drilling fluid circulation system, and the coil pipe is placed in the water tank, so that the liquid in the water tank exchanges heat with the drilling fluid through the coil pipe, the geothermal energy in the drilling process is fully utilized to heat the liquid in the water tank, the difficulty of the logistics support of polar region drilling is effectively relieved, the cost of the logistics support of polar region drilling is reduced, only the coil pipe and the corresponding water tank need to be added, the occupied space is small, the heat is derived from the geothermal energy, and the heat supply system is energy-saving and environment-friendly.)

1. The heat supply system for the drilling platform is characterized by comprising a water tank, a solid control device and a drilling pump, wherein a coil is arranged in the water tank, the coil comprises an inlet pipeline and an outlet pipeline, the inlet pipeline is connected with the solid control device, and the outlet pipeline is connected with the drilling pump.

2. The drilling platform heat supply system according to claim 1, wherein an electric heating element for heating and a generator on the platform are further provided in the water tank, and the generator is connected with the electric heating element.

3. The drilling platform heat supply system according to claim 1, further comprising a circulation pipeline having two ends respectively connected to the inlet pipeline and the outlet pipeline, wherein a first valve is disposed on the inlet pipeline, a second valve is disposed on the circulation pipeline, and one end of the circulation pipeline connected to the inlet pipeline is disposed on a side of the first valve away from the water tank.

4. The rig heat supply system of claim 3, further comprising a processor coupled to the generator and a computer readable medium coupled to the processor, the processor coupled to the drill pump, the computer readable medium having a predetermined program stored therein, the predetermined program when executed by the processor operable to perform the steps of: and detecting the state of the drilling pump, and starting the generator if the drilling pump does not work.

5. The drilling rig heat supply system of claim 4, wherein the predetermined program, when executed by the processor, further enables the steps of: and calculating the minimum drilling fluid discharge capacity, dividing the discharge capacity range into N nodes by taking the preset discharge capacity as a step length according to the minimum drilling fluid discharge capacity and the maximum drilling fluid discharge capacity, and calculating the drilling fluid outlet temperature of each node.

6. The drilling rig heat supply system of claim 5, wherein the predetermined program, when executed by the processor, further enables the steps of: and selecting the maximum drilling fluid outlet temperature to compare with a first preset temperature, and if the maximum drilling fluid outlet temperature is less than the first preset temperature, closing the first valve, opening the second valve and starting the generator.

7. The drilling rig heat supply system of claim 6, wherein the predetermined program, when executed by the processor, further enables the steps of: and if the maximum drilling fluid outlet temperature is higher than a first preset temperature, opening the first valve and closing the second valve.

8. The rig heat supply system of claim 7, further comprising a temperature sensing member disposed within the water tank, the temperature sensing member being coupled to the processor, the predetermined program when executed by the processor further enabling the steps of: and if the water temperature is lower than a second preset temperature within the preset time, starting the generator.

9. The drilling rig heat supply system of claim 5, wherein the predetermined program, when executed by the processor, further enables the steps of: according to the annular cross-sectional area A_aDiameter D of drill rod_pipeBorehole diameter D_holeAnd rate of penetration R_pCalculating the minimum drilling fluid discharge

Technical Field

The invention relates to the technical field of ocean oil and gas development, in particular to a heat supply system of a drilling platform.

Background

According to the latest survey published by the united states geological survey on month 5 in 2009: the arctic region has 120 x 108m³The crude oil reserves of (1) account for 13% of the non-exploited oil in the world, and the natural gas resources are 47 x 1014m³It accounts for 30% of the world, and 84% of these oil and gas reserves are distributed on the seabed. At present, more and more countries and oil companies begin to aim at the arctic region, and with the continuous development of science and engineering technology and the continuous ablation of arctic glaciers, the arctic oil and gas exploitation becomes possible and gradually becomes a hot spot for oil and gas exploration and development.

However, polar drilling faces more technical challenges than conventional marine drilling. The arctic climate is cold, the winter temperature is-20 to-40 ℃, the average air temperature in August is only-8 ℃ at most, so cold-proof measures are firstly needed to ensure the life safety of personnel when drilling in the arctic. Furthermore, the north pole is remote, rare and short of infrastructure. Large-scale equipment is difficult to transport and logistics are difficult to guarantee. The logistics are much more costly than anywhere else, potentially resulting in greatly prolonged drilling periods and even failure of the drilling completion.

Conventional marine drilling systems are designed with sufficient logistics and do not take into account the extreme cold climate throughout the year, and are therefore not suitable for drilling in cold regions of the arctic region.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a drilling platform heat supply system suitable for drilling in a cold region of the polar region, which makes full use of geothermal energy carried by returned drilling fluid in the drilling process to heat the living area of the drilling platform and effectively relieve the difficulty of logistics support.

In order to achieve the purpose, the invention adopts the technical scheme that:

a heat supply system of a drilling platform comprises a water tank, a solid control device and a drilling pump, wherein a coil is arranged in the water tank, the coil comprises an inlet pipeline and an outlet pipeline, the inlet pipeline is connected with the solid control device, and the outlet pipeline is connected with the drilling pump.

As a further optimization of the invention, an electric heating element for heating and a generator arranged on the platform are also arranged in the water tank, and the generator is connected with the electric heating element.

As a further optimization of the invention, the water tank further comprises a circulating pipeline, two ends of the circulating pipeline are respectively connected with the inlet pipeline and the outlet pipeline, the inlet pipeline is provided with a first valve, the circulating pipeline is provided with a second valve, and one end of the circulating pipeline, which is connected with the inlet pipeline, is arranged on one side, away from the water tank, of the first valve.

As a further optimization of the present invention, the present invention further comprises a processor connected to the generator, and a computer readable medium connected to the processor, wherein the processor is connected to the borehole pump, and the computer readable medium has a preset program stored therein, and when the preset program is executed by the processor, the preset program can implement the following steps: and detecting the state of the drilling pump, and starting the generator if the drilling pump does not work.

As a further optimization of the present invention, the predetermined program when executed by the processor further enables the following steps: and calculating the minimum drilling fluid discharge capacity, dividing the discharge capacity range into N nodes by taking the preset discharge capacity as a step length according to the minimum drilling fluid discharge capacity and the maximum drilling fluid discharge capacity, and calculating the drilling fluid outlet temperature of each node.

As a further optimization of the present invention, the predetermined program when executed by the processor further enables the following steps: and selecting the maximum drilling fluid outlet temperature to compare with a first preset temperature, and if the maximum drilling fluid outlet temperature is less than the first preset temperature, closing the first valve, opening the second valve and starting the generator.

As a further optimization of the present invention, the predetermined program when executed by the processor further enables the following steps: and if the maximum drilling fluid outlet temperature is higher than a first preset temperature, opening the first valve and closing the second valve.

As a further optimization of the present invention, the present invention further comprises a temperature detection element disposed in the water tank, the temperature detection element is connected to the processor, and the preset program when executed by the processor further realizes the following steps: and if the water temperature is lower than a second preset temperature within the preset time, starting the generator.

As a further optimization of the present invention, the predetermined program when executed by the processor further enables the following steps: according to the annular cross-sectional area A_aDiameter D of drill rod_pipeBorehole diameter D_holeAnd rate of penetration R_pCalculating the minimum drilling fluid discharge

Compared with the prior art, the invention has the beneficial effects that:

according to the heat supply system of the drilling platform, the coil pipe capable of exchanging heat is added into the drilling fluid circulation system, and the coil pipe is placed in the water tank, so that the liquid in the water tank exchanges heat with the drilling fluid through the coil pipe, the geothermal energy in the drilling process is fully utilized to heat the liquid in the water tank, the difficulty of the logistics support of polar region drilling is effectively relieved, the cost of the logistics support of polar region drilling is reduced, only the coil pipe and the corresponding water tank need to be added, the occupied space is small, the heat is derived from the geothermal energy, and the heat supply system is energy-saving and environment-friendly.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of the heat supply system of the drilling platform of the present invention;

fig. 2 is a schematic structural view of a water tank.

In the above figures, 1, a platform main body; 11. an upper deck; 12. a lower deck; 2. a drilling frame; 3. a drill floor; 4. an aircraft deck; 5. a living area; 6. a water tank; 61. a water tank main body; 62. a heat-insulating layer; 63. a temperature sensor; 701. a drill string; 702. a drill bit; 703. an annulus; 704. a wellhead outlet line; 705. controlling equipment fixedly; 706. an inlet line; 707. a first valve; 708. a second valve; 709. an outlet line; 710. a drilling pump; 711. a riser; 712. a coil pipe; 713. a recycle line; 81. a tank inlet line; 82. a tank outlet line; 83. a heating circulating pump; 84. an outlet line of the heating circulation pump; 91. a generator; 92. a cable; 93. an electric heating element.

Detailed Description

The invention is described in detail below by way of exemplary embodiments. It should be understood, however, that elements, structures and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.

In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "front", "rear", and the like indicate orientations or positional relationships based on positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Referring to fig. 1-2, the present invention provides a drilling platform heat supply system, which includes a water tank 6, a solid control device 705, and a drill pump 710, wherein a coil 712 is disposed in the water tank 6, the coil 712 includes an inlet line 706 and an outlet line 709, the inlet line 706 is connected to the solid control device 705, and the outlet line 709 is connected to the drill pump 710.

According to the heat supply system of the drilling platform, the coil 712 capable of exchanging heat is added in the drilling fluid circulation system, the coil 712 is placed in the water tank 6, so that the liquid in the water tank 6 exchanges heat with the drilling fluid through the coil 712, the geothermal energy in the drilling process is fully utilized to heat the liquid in the water tank 6, the difficulty of the logistics support of polar drilling is effectively relieved, the cost of the logistics support of polar drilling is reduced, only the coil 712 and the corresponding water tank 6 need to be added, the occupied space is small, the heat is derived from the geothermal energy, and the system is energy-saving and environment-friendly.

As shown in fig. 1, in this embodiment, the ocean platform includes: the offshore floating platform comprises a platform main body 1, an upper deck 11, a lower deck 12, a drilling rig 2, a drilling platform 3, an airplane deck 4, a living area 5 and a water tank 6, wherein the platform main body 1 is the lower part of the platform and is mainly used for providing buoyancy for the platform to maintain the balance of the platform on the sea surface, the platform main body 1 is divided into two layers, the upper surface is the upper deck 11, and the lower layer is the lower deck 12; the drilling platform 3 is positioned on an upper deck 11 and is a main area for drilling work, and various equipment required by drilling is arranged on the drilling platform; a drilling rig 2 mounted on a drilling floor 3 for suspending a drill string 701; the living area 5 is positioned at one end of the upper deck 11, is an area for the drilling worker to work and rest and is a main area needing heating; the airplane deck 4 is positioned at the top of the living area 5 and used for parking helicopters; the water tank 6 is located on the lower deck 12, and stores heat transfer working medium of a heating system of a living area in the water tank, wherein the heat transfer working medium can be water or antifreeze.

With further reference to fig. 2, an electric heating element 93 for heating and a generator 91 arranged on the platform are further arranged in the water tank 6, and the generator 91 is connected with the electric heating element 93, so that corresponding logistics support is provided when the temperature of the coil 712 is low or drilling fluid circulation is not performed.

Furthermore, the drilling fluid circulation system further comprises a circulation pipeline 713, two ends of the circulation pipeline 713 are respectively connected with the inlet pipeline 706 and the outlet pipeline 709, a first valve 707 is arranged on the inlet pipeline 706, a second valve 708 is arranged on the circulation pipeline 713, and one end of the circulation pipeline 713, which is connected with the inlet pipeline 706, is arranged on one side, which is far away from the water tank 6, of the first valve 707, so that when the drilling fluid circulates but the drilling fluid temperature is low, the second valve 708 can be opened, the first valve 707 is closed, the circulation of the drilling fluid does not pass through the coil 712, and the waste of heat generated by the electric heating element 93 when the drilling fluid temperature is too low is avoided.

In this embodiment, the drilling fluid circulation system comprises a drill string 701, a drill bit 702, an annulus 703, a wellhead outlet line 704, a cementing apparatus 705, an inlet line 706, an outlet line 709, a circulation line 713, a first valve 707, a second valve 708, a borehole pump 710, a riser 711, a coiled tubing 712, wherein: the upper end of a drill string 701 is hung on the top of a drill frame 2, the lower part of the drill string 701 extends into a shaft, the drill string 701 is of a hollow structure, and drilling fluid flows downwards in the drill string 701; a drill bit 702 is arranged at the lower end of the drill string 701, and the drilling fluid is sprayed out of the drill bit 702 to generate jet force to break rock; the annulus 703 is an annular space formed between the drill string 701 and the well wall, the drilling fluid ejected from the drill bit 702 returns upwards in the annulus 703, and the drilling fluid is influenced by the high temperature of the stratum and is continuously heated in the process of returning upwards in the annulus 703, so that the geothermal energy is carried to return to the drilling platform; a wellhead outlet pipeline 704 is connected with the annulus 703 and the solid control equipment 705, and drilling fluid returning from the annulus 703 flows into the solid control equipment 705 through the wellhead outlet pipeline 704; the solid control equipment 705 is positioned on the lower deck 12, and the drilling fluid is treated by the solid control equipment 705 at the position to remove solid particles such as rock debris; an inlet pipeline 706 is connected with a solid control device 705 and a water tank 6, a first valve 707 is arranged on the inlet pipeline 713, a circulation pipeline 713 and the inlet pipeline 706 are connected on one side of the first valve 707 close to the solid control device 705, a second valve is arranged on the circulation pipeline 713, the flow direction of drilling fluid at the position is controlled by controlling the opening and closing of the first valve 707 and the second valve 708, the first valve 707 is opened under the normal condition, the second valve 708 is closed, the drilling fluid flows into a coil 712 inside the water tank 6 so as to transfer geothermal energy to a living area heating system, when the drilling fluid is not drilled into a deep high-temperature stratum, the returned drilling fluid cannot carry enough geothermal energy to heat the heating system, at the moment, the first valve 707 is closed, the second valve 708 is opened, and the drilling fluid directly passes through the water tank 6 and enters the outlet pipeline 709 through the circulation pipeline 713, and turning on the generator 91 to convert the heating mode into the traditional electric heating mode; the coil 712 is located in the water tank 6, the drilling fluid exchanges heat with the heat transfer working medium in the water tank 6 when flowing through the position so as to transfer geothermal energy to a heating system of a living area, and two ends of the coil 712 are respectively connected with the inlet pipeline 706 and the outlet pipeline 709; the outlet line 709 connects the water tank 6 with the borehole pump 710; the drilling pump 710 is positioned on the drilling platform 3 and provides power for the circulation of drilling fluid; a riser 711 connects the borehole pump 710 with the drill string 701. The whole drilling fluid circulation heating system forms a closed loop, drilling fluid circularly flows in the drilling fluid circulation heating system, geothermal energy is continuously transmitted to a living area heating system, and heat insulation layers are arranged on the outer sides of all pipelines in the system to prevent heat loss.

Further, the system comprises a processor connected to the generator 91, and a computer readable medium connected to the processor, wherein the processor is connected to the borehole pump 710, and the computer readable medium has a preset program stored therein, and when the preset program is executed by the processor, the preset program can implement the following steps: and detecting the state of the drilling pump 710, and if the drilling pump 710 does not work, starting the generator 91, so that the generator 91 is automatically started when the drilling fluid is not circulated, and the situation that the logistics support cannot be supplied in time due to the switching of the drilling state is prevented.

Further, referring to fig. 1, in the present embodiment, the living area heating section includes: a tank inlet line 81, a tank outlet line 82, a heating circulation pump 83, a heating circulation pump outlet line 84, wherein: the water tank inlet pipeline 81 connects the living area 5 and the water tank 6; the water tank outlet line 82 connects the water tank 6 with the heating circulation pump 83; the heating circulating pump 83 provides circulating power for the heat transfer working medium in the living area heating system; heating circulating pump outlet pipeline 84 connects heating circulating pump 83 and living area 5, and whole living area heating system forms a closed return circuit, and heat transfer working medium circulates in its inside, receives the geothermal energy that drilling fluid circulation system transmitted in the water tank, comes heating for living area 5 through the heating pipeline in living area 5, and the thermal insulation layer is all installed to all pipeline outsides in this system and prevents thermal loss.

Referring to fig. 1, in the present embodiment, the electric heating section includes: generator 91, cable 92, electric heat spare 93, wherein: the generator 91 is located on the upper deck and generates electricity by burning diesel oil; the cable 92 connects the generator 91 with the electric heating element 93; electric heat spare 93 is located the inside of water tank 6, turns into heat energy and transmits for living area heating system with the electric energy behind the switch on, and electric power heating system is as an effective replenishment of geothermal energy heating, only when drilling system stop work or when not having bored into deep high temperature stratum, just converts the heating mode into traditional electric power heating.

Referring to fig. 2, in the present embodiment, the water tank 6 includes: water tank main body 61, heat preservation 62, temperature sensor 63, wherein: the water tank main body 61 is used for storing a heat transfer working medium of a living area heating system, and the heat transfer working medium can be water or antifreeze; the heat insulation layer 62 covers the periphery of the water tank main body 61 and is used for preventing heat of a heat transfer working medium in the water tank from being transferred to the surrounding environment to cause loss; the sensing part of the temperature sensor 63 is arranged inside the water tank, and the dial plate of the temperature sensor is arranged outside the water tank to read data conveniently.

Further, the preset program when executed by the processor further enables the following steps: and calculating the minimum drilling fluid discharge capacity, dividing the discharge capacity range into N nodes by taking the preset discharge capacity as a step length according to the minimum drilling fluid discharge capacity and the maximum drilling fluid discharge capacity, and calculating the drilling fluid outlet temperature of each node.

In this embodiment, the minimum drilling fluid displacement is calculated according to basic data of drilling, and the processor calculates according to data input or detected by a corresponding sensor, where the basic data in this embodiment includes: the minimum drilling fluid discharge capacity meets the requirement of well cleaning, and rock debris can be lifted to a platform, and the calculation method of the minimum drilling fluid discharge capacity comprises the following steps:

in the formula:

Q_min-minimum drilling fluid displacement;

A_a-an annulus cross-sectional area;

D_pipe-a drill rod diameter;

D_hole-a borehole diameter;

R_p-rate of penetration.

The maximum drilling fluid discharge capacity is limited by the drilling pump, and when the model of the drilling pump on the drilling platform is confirmed, the maximum drilling fluid discharge capacity Q is_maxI.e. is determined.

In the present embodiment, the displacement is 0.01m in the drilling fluid displacement range³And/min is that step length is averagely divided into N nodes, drilling fluid outlet temperature of the corresponding displacement of each node is respectively calculated, and calculation models of temperature fields of favorite wellholes with different displacements are shown in formulas (2) and (3):

in the formula:

v-drilling fluid flow rate;

T_p-temperature inside the drill pipe;

T_a-the temperature in the annulus;

T_ei-ambient temperature;

t-time;

z-distance from wellhead;

r_p-a drill rod diameter;

r_a-an annulus diameter;

U_p-total heat transfer coefficient in drill pipe

U_a-total heat transfer coefficient in annulus

c_f-specific heat of drilling fluid;

w-drilling fluid mass flow;

k_e-formation thermal conductivity;

T_D-dimensionless time.

According to the formulas (2) and (3), the distribution of the temperature field in the shaft under the displacement can be obtained, the outlet temperature of the well head drilling fluid is further obtained, and Q is obtained through calculation respectively_min,Q₁,Q₂Q₃......Q_maxCorresponding drilling fluid outlet temperature T_min,T₁,T₂T₃......T_max。

Further, the preset program when executed by the processor further enables the following steps: comparing the calculated highest drilling fluid outlet temperature with a first preset temperature, if the highest drilling fluid outlet temperature is lower than the first preset temperature, closing the first valve 707 and the second valve 708, and starting the generator 91, if the highest drilling fluid outlet temperature is higher than the first preset temperature, controlling the drilling pump 710 to circulate drilling fluid at a discharge volume of the drilling pump at a more suitable temperature, in this embodiment, the first preset temperature is selected to be 40 ℃, the temperature is a more suitable warm keeping temperature, if the highest drilling fluid outlet temperature is higher than 40 ℃, an optimum temperature, such as 45 ℃, is selected, the first valve 707 is opened, the second valve 708 is closed, and furthermore, if the temperature in the water tank 6 is lower than the second preset temperature after the drilling fluid circulates for a certain time, the generator 91 is started, and the electric heating element 93 is used for auxiliary heating, therefore, the required temperature is quickly reached, if the temperature of the drilling fluid is still higher than the first preset temperature after reaching a certain temperature, the processor controls the generator 91 to stop, and geothermal energy is more fully utilized.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention in other forms, and any person skilled in the art may apply the above modifications or changes to the equivalent embodiments with equivalent changes, without departing from the technical spirit of the present invention, and any simple modification, equivalent change and change made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the technical spirit of the present invention.