CN105733660A - Crude oil and sand separation washing device for oil field - Google Patents

Abstract

The invention provides a crude oil mud sand separation and cleaning device in an oil field, which includes: a separator, which is connected to the oil production wellhead by a liquid inlet pipe, and separates the received crude oil from liquid to solid by means of swirling flow, and is provided with a device on the top to discharge the separated crude oil The liquid discharge pipe A is provided with a sand discharge port for discharging separated mud and sand at the bottom; the solid receiving box is installed below the separator, communicates with the sand discharge port through the upper part, and is provided with a sand discharge pipe A at the bottom; The cleaning box is connected with the sand discharge pipe A to clean the crude oil in the mud and sand, including the infusion pipe arranged on the box body for inputting the cleaning liquid, the liquid discharge pipe A for discharging the separated crude oil, and the sand discharge pipe for discharging the cleaned mud and sand Tube B, and submerged pump A provided in the tank to provide stirring power. This embodiment has a simple structure, high separation efficiency, and is easy to realize automatic control, and can directly clean the crude oil discharged from the oil well on-line without affecting the normal discharge of the oil well.

Description

Oilfield crude oil mud sand separation and cleaning device

technical field

The invention relates to the field of oil production, in particular to a device for simultaneously performing mud and sand separation and cleaning on-line for crude oil flowing out of an oil production well.

Background technique

In the process of crude oil extraction, underground mud and sand will inevitably be brought to the surface, especially when the oil field enters the middle and later stages of exploitation, due to continuous fracturing and huff and puff oil recovery, the phenomenon of sand production will become more and more serious. The mud and sand not only bring a lot of harm to the production of pipelines and tanks, but also due to the improvement of environmental protection standards, the mud and sand discharged from the liquid production are only allowed to be discharged outside when the oil content drops to a certain standard.

In the prior art, there are also cleaning solutions for mud and sand, which generally use submerged pump stirring to clean oily mud and sand. First of all, this method cannot remove sand in the state of oil production, and the efficiency is low. In addition, it has no measures for cleaning sand in low-temperature heavy oil. Moreover, the energy consumption and wear of the cleaning equipment are also relatively large.

Contents of the invention

The object of the present invention is to provide a desanding device capable of on-line separation of silt contained in crude oil.

In particular, the present invention provides a device for separating and cleaning oilfield crude oil mud and sand, comprising:

The separator is connected with the head of the oil production well through the liquid inlet pipe, and the liquid-solid separation of the received crude oil is carried out by means of swirling flow, and the discharge pipe A for discharging the separated crude oil is arranged on the top, and the discharge pipe A for discharging the separated mud and sand is arranged at the bottom. Sand outlet;

The solid receiving box is installed below the separator, communicates with the sand discharge port through the upper part, and is provided with a sand discharge pipe A at the lower part;

The cleaning box is connected with the sand discharge pipe A to clean the crude oil in the mud and sand, including the infusion pipe for inputting the cleaning liquid arranged on the box body, the liquid discharge pipe A for discharging the separated crude oil, and the sand discharge pipe for discharging the cleaned mud and sand Tube B, and submerged pump A provided in the tank to provide stirring power.

Further, the cleaning tank at least includes a first cleaning tank and a second cleaning tank with the same structure, the first cleaning tank is provided with a secondary filter pipe connected to the liquid inlet pipe of the separator, and the second cleaning tank The drain pipe B of a cleaning tank is connected to the drain pipe A to output the cleaned crude oil, the submerged pump B of the first cleaning tank is connected to the secondary filter pipe, and the second cleaning tank The output pipeline of the submerged pump C is connected to the liquid inlet pipe of the separator, the liquid discharge pipe of the separator is connected to the liquid discharge pipe A, and the sand discharge port is connected to the second cleaning tank; Each pipeline is provided with a valve to realize the independent operation, simultaneous operation and cycle operation of the first cleaning tank and the second cleaning tank.

Further, the valve includes a first valve and a second valve installed on the secondary filter pipe and located on both sides of the connection end of the submerged pump B, and the oil discharge port of the separator is connected to the liquid discharge port. The pipe B is connected, and the discharge pipe B on both sides of its connection point is provided with a third valve and a fourth valve, and the outlet pipe connected to the liquid inlet pipe of the submerged pump C is There is a fifth valve on the road.

Further, the separator includes a separation tank, a liquid discharge pipe and a sand discharge port, the upper part of the separation tank is cylindrical and the lower part is a constricted cone, and the liquid inlet pipe is connected to the upper part of the separation tank obliquely , the drain pipe is installed at the center of the upper part of the separation tank and the connecting end is inserted into the separation tank, and the sand discharge port is installed at the conical outlet of the lower part of the separation tank.

Further, the input of the infusion pipe is a heat medium whose temperature is higher than that of the crude oil.

Further, the heat medium is hot water, steam or diluent.

Further, a cleaning device for pushing the washed mud and sand to the sand discharge pipe B is installed at the bottom of the cleaning box.

Further, the cleaning device is provided with an auger with helical blades.

Further, a rotary scrubbing device is installed in the cleaning box, and the scrubbing device includes two rotating shafts arranged at intervals and a driving motor for driving the rotating shafts. and staggered stirring rods.

Further, the rotation tracks of the stirring rods of the two rotation shafts are staggered.

The invention has a simple structure and high separation efficiency, is easy to realize automatic control, and can directly clean the sandy crude oil discharged from the oil well on-line without affecting the normal production of the oil well.

Description of drawings

Fig. 1 is a schematic structural view of a separation and cleaning device according to an embodiment of the present invention;

Fig. 2 is a schematic structural view of two cleaning boxes connected in series according to an embodiment of the present invention;

Fig. 3 is the structural representation of liquid-solid separator among Fig. 1;

Fig. 4 is a schematic structural view of three cleaning boxes connected in series according to an embodiment of the present invention;

Fig. 5 is a schematic structural view of two sets of separators and cleaning tanks circulating according to an embodiment of the present invention;

In the figure: 1-Inlet pipe, 2-Separator, 21-Oil discharge port, 22-Sand discharge port, 23-Separation tank, 3-Drain pipe B, 4-Solid receiving box, 5-Installation frame, 6 -Sand discharge pipe A, 7-cleaning box, 71-first cleaning box, 72-second cleaning box, 73-discharge pipe B, 74-secondary filter tube, 75-submerged pump B, 76-submerged Pump C, 77-transfusion pipe, 78-submerged pump A, 8-sand discharge pipe B.

detailed description

As shown in Figures 1 and 2, the separation and cleaning device of one embodiment of the present invention generally includes: a separator 2 for liquid-solid separation of the received crude oil in a rotating manner, a solid receiving box 4 for accumulating and separating mud and sand, receiving Accumulated silt to clean the cleaning box 7.

The separator 2 is connected to the oil production wellhead through the liquid inlet pipe 1. It is provided with an oil discharge port 21 connected to the discharge pipe A3 for discharging the separated crude oil at the top, and a sand discharge port 22 for discharging the separated mud and sand at the bottom. The solid receiving box 4 is installed below the separator 2, and its upper part communicates with the sand discharge port 22, and its lower part is provided with a sand discharge pipe A6. The cleaning box 7 is connected to the sand discharge pipe A6 of the fixed receiving box 4, and the cleaning box 7 is provided with an infusion pipe 77 for inputting the cleaning liquid, and is connected with the liquid discharge pipe A3 to discharge the liquid discharge pipe B73 of the crude oil after separation, and discharges and cleans. The sand discharge pipe B8 for the rear mud and sand, and the submerged pump A78 provided in the box to provide stirring power.

The crude oil produced underground directly enters the separator 2 through the liquid inlet pipe 1, and the separator 2 uses centrifugal force to separate the crude oil from liquid to solid. The silt enters the solid receiving box 4 by the sand discharge port 22, and the solid receiving box 4 can discharge the internal silt to the cleaning box 7 in a manner of discharging at any time, or it can wait for its internal silt to accumulate to a certain amount before discharging again. The discharged mud and sand are uniformly cleaned in the cleaning box 7 . When the cleaning box 7 is cleaned, a fully enclosed method can be used to stir and clean the mud and sand in the cleaning liquid. After cleaning for a specified time, it is allowed to stand and settle to separate the cleaned mud and sand from crude oil and liquid. The liquid can be discharged through the drain pipe B73. The discharged crude oil can be directly transported, or it can be separated from the crude oil and the cleaning solution and then processed separately, and the separated cleaning solution can be recycled. The settled mud and sand meeting the discharge standard can be directly discharged from the sand discharge pipe B8.

This embodiment has a simple structure, high separation efficiency, and is easy to realize automatic control, and can directly clean the crude oil discharged from the oil well on-line without affecting the normal production of the oil well. In addition, this scheme can not only carry out sand washing operation on the directly produced crude oil, but also clean and deoil the oily mud sand deposited in the oil storage tank after extraction.

The specific cleaning solution can be hot water, steam or diluent. When the crude oil is heavy oil with a low temperature, hot water or steam with a temperature higher than that of the crude oil can be used to improve the liquid-solid separation effect of the crude oil. When the temperature of the crude oil itself is high, the diluent can be used to reduce the consistency of the crude oil to improve the liquid-solid separation effect.

As shown in FIG. 5 , in this solution, the separator 2 and the solid receiving box 4 can be installed on a mounting frame 5 . When necessary, a separation group composed of multiple separators 2 and solid receiving boxes 4 can be connected in series to improve the separation effect of mud and sand.

Further, for avoiding that the mud and sand in the cleaning box 7 are not easy to discharge after being deposited, a cleaning device (not shown) that pushes the cleaned mud and sand to the sand discharge pipe B8 can be installed at the bottom of the cleaning box 7 . The specific cleaning device may be a structure such as a corresponding scraper and a push plate controlled by a motor. And the bottom of the cleaning box 7 can also be set to a corresponding arc structure, so that the mud and sand can be more easily processed in a concentrated manner.

In one embodiment of the present invention, the cleaning device may be an auger (not shown in the figure) provided with helical blades. The auger is driven by the motor, and the blades can be used to push the mud and sand at the bottom of the box to the sand discharge pipe B8. The auger structure can reduce resistance and occupy space. Now, in order to facilitate the auger to work, a groove can be set at the bottom of the cleaning box 7, the groove and the bottom of the cleaning box 7 are connected obliquely, the auger is installed in the groove, and the mud and sand can be made to flow toward the groove through this structure. Concentrated inside to facilitate the work of the auger.

Further, in one embodiment of the present invention, in order to improve the cleaning effect of mud and sand, there can be multiple concrete cleaning boxes 7, and a structure interconnected step by step is formed between a plurality of cleaning boxes 7, so that the discharged mud and sand can be Each cleaning box 7 is cleaned in turn, and discharged until the discharge standard is met. The specific number of cleaning boxes 7 can be determined according to parameters such as the cleaning capacity, cleaning effect, and cleaning time of the cleaning box 7 used. And can realize intercommunication between adjacent cleaning boxes 7 .

A cleaning method is described below with an embodiment in which two cleaning tanks are interconnected.

This embodiment includes the first cleaning tank 71 and the second cleaning tank 72 of the same structure, the first cleaning tank 71 is provided with a secondary filter pipe 74 connected with the liquid inlet pipe 1 of the separator 2, the first cleaning tank 71 The drain pipe B73 of the drain pipe is connected with the drain pipe A3 to output the cleaned crude oil, the submerged pump B75 of the first cleaning tank 71 is connected with the secondary filter pipe 74, and the output pipe of the submerged pump C76 of the second cleaning tank 72 The road is connected with the liquid inlet pipe 1 of the separator 2, and the sand discharge port 22 of the separator 2 is connected with the second cleaning tank 72.

During operation, the crude oil on the upper part of the box body cleaned during the cleaning process in the first cleaning tank 71 contains less solids, and can be directly transported to the drain pipe A3 through the drain pipe B73 at this time. Except for this part of crude oil, the remaining crude oil and cleaning liquid mixed liquid can be transported to the separator 2 under the drive of the submerged pump B75 for liquid-solid separation, and the separated mud, sand and liquid are discharged into the second cleaning tank 72 , and the crude oil that meets the discharge standard after separation can be directly transported to the discharge pipe A3 through the discharge pipe B73 for discharge. The liquid cleaned in the second cleaning tank 72 is transported to the separator 2 by the liquid pump C76 for liquid-solid separation, wherein the crude oil that meets the standard is transported to the drain pipe A3 by the separator 2, and the separated mud, sand and liquid Then enter the second cleaning tank 72 again for cleaning. In this embodiment, the oil-containing mud and sand are repeatedly cleaned by means of cyclic cleaning until the discharge standard of the mud and sand meets the requirements. The entire cleaning process does not require manual intervention, and automatic processing can be realized, and the cleaning times can be adjusted at any time according to the discharge standard, and the operation is simple. , The cleaning effect is obvious.

In this embodiment, the structure of a separator 2 is used for illustration. In other embodiments, one or more separators can also be installed separately in a plurality of interconnected cleaning tank systems, and the crude oil output from the wellhead The processed separator is unchanged.

As shown in Fig. 4, when there are three cleaning tanks 7, the first cleaning tank communicates with the second cleaning tank, and the third cleaning tank communicates with the second cleaning tank. The mud, sand and liquid that have been preliminarily cleaned in the first cleaning tank are discharged to the second cleaning tank for cleaning again, and the liquid cleaned in the second cleaning tank is discharged to the third cleaning tank for cleaning again. The liquid after cleaning can be directly discharged from the discharge pipe B73, and the liquid containing solids under a certain standard can also be directly discharged from the discharge pipe B73 during the cleaning process of the first and second cleaning tanks. The mud and sand that can be discharged after cleaning in the cleaning box can be discharged through the respective sand discharge pipes B8. In order to reduce the content of solids in the liquid, a separator 2 can be arranged on the liquid communication pipelines of the adjacent cleaning tanks 7, so as to minimize the solids in the liquid when communicating.

In addition, in this embodiment, in order to control the first cleaning tank 71 and the second cleaning tank 72 to achieve different processes, each pipeline can be set to realize the first cleaning tank 71 and the second cleaning tank 72 working independently, simultaneously and circulating working valve. For example, the pipelines of the first cleaning tank 71 and the second cleaning tank 72 can be used in a mixed manner, but corresponding control valves can be installed at different positions, and the two cleaning tanks can be realized under the condition of sharing pipelines by switching the valves. Realize the respective conveying work.

Specifically, the valve may include a first valve 31 and a second valve 32 installed on the secondary filter pipe 74 and located on both sides of the connection end of the submerged pump B75, and the oil discharge port 21 of the separator 2 is connected to the drain pipe B73 , and the third valve 33 and the fourth valve 34 are set on the discharge pipe B73 on both sides of its connection point, and the fifth valve 35.

For the first cleaning tank 71, close the second valve 32, open the first valve 31 and the submerged pump B75, the oily mud and sand are continuously mixed and stirred with hot water in the first cleaning tank 71, and the first stage of degreasing cleaning is carried out; After the first level of cleaning, close the first valve 31, open the second valve 32 and the third valve 33, ensure that the fourth valve 34 and the fifth valve 35 are closed, and the liquid in the first cleaning tank 71 is lifted to the The second cleaning tank 72, the silt that has taken off most of the liquid is discharged into the second cleaning tank 72 through the bottom of the separator 2, and crude oil and part of the liquid return to the first cleaning tank 71 through the oil discharge port 21 at its top; In the second cleaning box 72, the fourth valve 34 can be opened, the second valve 32, the third valve 33, and the fifth valve 35 can be closed, and the submerged pump C76 can be opened to carry out circular sand washing. The shear washing in the interior further reduces the oil content; when the fourth valve 34, the fifth valve 35 are opened, the second valve 32 and the third valve 33 are closed, and the submerged pump C76 is turned on, the crude oil in the second cleaning tank 72 And part of the liquid can be directly transported to the discharge pipe B73, and the remaining mud and sand meeting the discharge standard in the second cleaning tank 72 are discharged outwards through the sand discharge pipe B8 at the bottom.

As shown in Fig. 3, further, the separator 2 that the present invention adopts can be following structure, and it comprises separating tank 23, oil discharge port 21 and sand discharge port 22, and the upper part of this separating tank 23 is cylindrical and the lower part is contracted Conical, the liquid inlet pipe 1 is connected to the upper part of the separation tank 23 obliquely, the oil discharge port 21 is installed at the center of the upper part of the separation tank 23 and the connection end is inserted into the separation tank 23, and the sand discharge port 22 is installed at the bottom of the separation tank 23 Tapered exit. During separation, the liquid enters at a certain speed and is tangential to the central axis of the separation tank 23, and forms an angle with the inner peripheral side wall of the separation tank 23 that is conducive to the rotation of the liquid. The angle can be less than 90 degrees, specifically The included angle between the liquid inlet pipe 1 and the axis line of the separation tank 23 can be between 30° and 60°. The liquid rotates around its axis in the separation tank 23. During the rotation, the silt in the liquid is thrown to the side wall of the separation tank 23 under the action of centrifugal force, and gradually descends in a spiral manner. The sand outlet 22 is discharged. The liquid containing less mud and sand is gathered at the axis of the separation tank 23 under the centrifugal force, and then discharged from the oil discharge port 21 to the discharge pipe A3 connected thereto.

Further, in order to improve the cleaning effect of mud and sand, in one embodiment of the present invention, a rotary scrubber (not shown) can be installed in the cleaning box 7, and the scrubber includes two rotating shafts arranged at intervals and a driving The drive motor that rotates the rotary shaft is provided with vertical and staggered stirring rods on the peripheral surface of the rotary shaft.

The two rotating shafts are fixed vertically to the bottom of the box, and each stirring rod stirs the mud and sand in the box in the horizontal direction to speed up and improve the reaction speed with the cleaning liquid, and at the same time crush the larger mud and sand. The rotation time of the rotating shaft can be controlled by the motor, and after stirring for a predetermined time, it can be left to stand for a period of time to separate liquid and silt. The quantity, position, and rotating speed of the stirring rods can also be based on the installation positions of each component, such as the stirring rods are only arranged at the bottom of the casing to avoid affecting the upper submerged pump. The rotation ranges of the stirring rods on the two rotating shafts can be staggered or overlapped, and can also be spaced.

So far, those skilled in the art should appreciate that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, the disclosed embodiments of the present invention can still be used. Many other variations or modifications consistent with the principles of the invention are directly identified or derived from the content. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (10)

1. a crude oil silt particle separation cleaning device, it is characterised in that including:

Separator, utilizes feed tube to be connected with production wellhead, by the mode of eddy flow, the crude oil received is carried out solid-liquor separation, and top be provided with discharge separate after the discharging tube A of crude oil, bottom be provided with discharge separate after the sand removing hole of silt particle；

Solid receiving magazine, is arranged on the lower section of described separator, is connected with described sand removing hole by top, and bottom is provided with sediment outflow pipe A；

Cleaning case, it is connected with described sediment outflow pipe A, to clean the crude oil in silt particle, including the tube for transfusion inputting cleanout fluid being arranged on casing, discharge the sediment outflow pipe B of silt particle after the discharging tube A of crude oil, discharge after separating are cleaned, and be arranged on the interior submerged pump A that stirring power is provided of casing.

2. crude oil silt particle separation cleaning device according to claim 1, it is characterised in that

Described cleaning case at least includes the first cleaning case and second cleaning case of same structure, described first cleaning case is provided with the secondary filter pipe that the feed tube with described separator is connected, the discharging tube B of described first cleaning case and described discharging tube A is connected with by the crude oil output after cleaning, the submerged pump B of described first cleaning case is connected with described secondary filter pipe, the output pipe of the submerged pump C of described second cleaning case is connected with the feed tube of described separator, the discharging tube of described separator is connected with described discharging tube A, and sand removing hole is connected with described second cleaning case；Each pipeline is arranged and realizes described first cleaning case and described second cleaning case works alone, works and the valve of periodic duty simultaneously.

3. crude oil silt particle separation cleaning device according to claim 2, it is characterised in that

Described valve includes the first valve and the second valve that are arranged on described secondary filter pipe and are positioned at described submerged pump B link both sides, the oil drain out of described separator is connected with described discharging tube B, and it is provided with the 3rd valve and the 4th valve on the described discharging tube B of the both sides of its junction point, the described submerged pump C output pipe being connected with the feed tube of described separator is provided with the 5th valve.

4. crude oil silt particle separation cleaning device according to claim 1, it is characterised in that

Described separator includes knockout drum, discharging tube and sand removing hole, the top of described knockout drum is cylindrical lower portion is the taper shunk, described feed tube is connected with the top of described knockout drum obliquely, described discharging tube is arranged in top circle centre position and the link described knockout drum of insertion of described knockout drum, and described sand removing hole is arranged on the conical outlet place of described knockout drum bottom.

5. crude oil silt particle separation cleaning device according to claim 1, it is characterised in that

The input of described tube for transfusion is the temperature thermal medium that is higher than described crude oil temperature.

6. crude oil silt particle separation cleaning device according to claim 5, it is characterised in that

Described thermal medium is hot water, steam or dilution medicament.

7. crude oil silt particle separation cleaning device according to claim 1, it is characterised in that

The box bottom of described cleaning case is provided with the cleaning plant that silt particle after cleaning is pushed to sediment outflow pipe B.

8. crude oil silt particle separation cleaning device according to claim 7, it is characterised in that

Described cleaning plant is provided with the auger of spiral vane.

9. crude oil silt particle separation cleaning device according to claim 1, it is characterised in that

Being provided with rotary Scrubbing apparatus in described cleaning case, described Scrubbing apparatus includes two spaced rotating shafts and the drive motor driving described rotating shaft to rotate, and is provided with vertical and staggered puddler on the circumferential surface of described rotating shaft.

10. crude oil silt particle separation cleaning device according to claim 9, it is characterised in that

The swing-around trajectory of the puddler of two described rotating shafts interlocks.