System suitable for recovering barite in oil field

Abstract

The utility model relates to the technical field of petroleum and natural gas drilling fluid treatment systems, in particular to a system suitable for recycling barite in an oil field, which comprises an independent skid seat divided into an upper layer and a lower layer, a first centrifugal machine and a second centrifugal machine are mounted on the upper layer of the independent skid seat, and a first liquid supply pump and a second liquid supply pump are mounted on the lower layer of the independent skid seat. The first liquid supply pump is connected with a feeding port of the first centrifugal machine, the second liquid supply pump is connected with a feeding port of the second centrifugal machine, a feeding hopper and a centrifugal pump are further installed on the lower layer of the independent skid-mounted base, and a suction inlet of the centrifugal pump is connected with the feeding hopper. The cost can be saved, and the environment is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas drilling fluid treatment systems, and particularly relates to a system suitable for recovering barite in oil fields. Background Art

[0002] During the drilling and workover operations, the drilling fluid returned from the wellhead contains a large amount of cuttings and needs to be processed by five-stage purification equipment (vibrating screen, degasser, desander, desilter, centrifuge) to remove most of the harmful solids, maintain the performance of the drilling fluid and recycle it. When passing through the centrifuge, a large amount of small particle substances are separated out. What is separated is not only harmful solids such as cuttings, but also useful substances such as barite and iron ore powder that need to re-enter the drilling fluid circulation system, resulting in great waste. In the subsequent process, these useful substances still need to be added again to meet the needs of drilling. With the increase of drilling costs, major drilling companies are trying to implement the scheme of barite recovery.

[0003] Therefore, it is necessary to propose a system suitable for recovering barite in oil fields to save drilling costs. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problem that the existing purification equipment is easy to separate useful substances such as barite when separating cuttings, resulting in great waste, and now provides a system suitable for recovering barite in oil fields.

[0005] The technical solution of the utility model is as follows:

[0006] A system suitable for recovering barite in oil fields includes an independent skid base divided into upper and lower layers. A first centrifuge and a second centrifuge are installed on the upper layer of the independent skid base. A first liquid supply pump and a second liquid supply pump are installed on the lower layer of the independent skid base. The first liquid supply pump is connected to the feed inlet of the first centrifuge, and the second liquid supply pump is connected to the feed inlet of the second centrifuge. A feeding funnel and a centrifugal pump are also installed on the lower layer of the independent skid base. The suction port of the centrifugal pump is connected to the feeding funnel;

[0007] It further includes a solids control tank and a collection tank. The solids control tank is connected to the first liquid supply pump, and the collection tank is respectively communicated with the liquid outlet of the first centrifuge and the second liquid supply pump;

[0008] It further includes a mud pit. The slag discharge port of the first centrifuge is connected with a cuttings discharge pipeline, and the cuttings discharge pipeline is alternately communicated with the feeding funnel and the mud pit. The discharge port of the centrifugal pump is connected to the solids control tank. The liquid outlet of the second centrifuge is connected to the solids control tank, and the slag discharge port of the second centrifuge is connected to the mud pit.

[0009] Furthermore, there are two centrifugal pumps. The suction ports of the two centrifugal pumps are in parallel, and the discharge ports of the two centrifugal pumps are in parallel.

[0010] Furthermore, a sunshade is provided at the top of the upper layer of the independent skid base.

[0011] Furthermore, aisle railings are provided on the upper layer of the independent skid base.

[0012] Furthermore, the first centrifuge is a variable-frequency medium-speed centrifuge, and the second centrifuge is a variable-frequency or non-variable-frequency high-speed centrifuge.

[0013] Furthermore, the columns of the independent skid base are of telescopic structure, and the telescoping of the columns can drive the independent skid base to lift.

[0014] For the system of the present utility model applicable to the recovery of barite in oilfields, after the liquid supply pump of the first centrifuge sucks the mud to be treated from the side solids control tank, through the primary separation of cuttings by the first centrifuge, the liquid is discharged into the collection tank on the independent skid base. The large cuttings and large barite particles enter the mud pit or the feeding hopper through the cuttings discharge pipeline. The small cuttings and large barite particles enter the collection tank along with the liquid. When used for non-weighted drilling fluid, the cuttings discharge pipeline is connected to the mud pit, so as to be directly discharged into the mud pit. When barite needs to be recovered, the cuttings discharge pipeline is connected to the feeding hopper, so as to discharge the large cuttings and large barite particles into the feeding hopper. The feeding hopper separates the large cuttings and barite. The large barite particles enter the subsequent solids control tank after being circulated by the centrifugal pump, while the large cuttings are discarded and discharged. After the second liquid supply pump sucks the mud to be treated from the collection tank, through the secondary separation of cuttings by the second centrifuge, the liquid containing small barite particles is discharged into the adjacent solids control tank for collection and storage, and the small cuttings are directly discharged into the mud pit;

[0015] The suction port of the centrifugal pump can suck mud from the adjacent solids control tank, and the discharge port can either be directly discharged back into the solids control tank for mud transfer between solids control tanks, or be discharged back into the solids control tank after feeding through the feeding hopper to achieve the function of preparing mud. Compared with the traditional technology, this technical solution reduces the consumption of barite in mud preparation, which can not only save costs but also protect the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the front view of the present utility model;

[0017] Figure 2 is the left view of the present utility model;

[0018] Figure 3 is the system flow chart of the present utility model.

[0019] Reference numerals: 1, independent skid base; 2, first centrifuge; 3, second centrifuge; 4, first liquid supply pump; 5, second liquid supply pump; 6, feeding hopper; 7, centrifugal pump; 8, solids control tank; 9, collection tank; 10, cuttings discharge pipeline; 11, sunshade; 12, aisle railing. Detailed implementation mode

[0020] In order to make the technical means, technical features, utility model purpose and technical effects achieved by the present utility model easy to understand, the present utility model will be further elaborated below with reference to specific drawings.

[0021] Embodiment 1:

[0022] As Figure 1 and Figure 2 shown, this embodiment provides a system suitable for recovering barite in oil fields, including an independent skid base 1 divided into upper and lower layers. The upper layer of the independent skid base 1 is screwed with a first centrifuge 2 and a second centrifuge 3, and the lower layer of the independent skid base 1 is screwed with a first liquid supply pump 4 and a second liquid supply pump 5. The first liquid supply pump 4 is connected to the feed inlet of the first centrifuge 2 by screws, and the second liquid supply pump 5 is connected to the feed inlet of the second centrifuge 3 by screws. The lower layer of the independent skid base 1 is also screwed with a feeding hopper 6 and a centrifugal pump 7. The suction port of the centrifugal pump 7 is connected to the feeding hopper 6 by pipes and screws;

[0023] It also includes a solids control tank 8 and a collection tank 9. The solids control tank 8 is connected to the first liquid supply pump 4 by pipes and screws. The collection tank 9 is respectively connected to the liquid outlet of the first centrifuge 2 and the second liquid supply pump 5 by pipes and screws. The collection tank 9 is preferably 3.5 m³. It also includes a mud pit. The slag outlet of the first centrifuge 2 is screwed with a cuttings discharge pipeline 10. The cuttings discharge pipeline 10 is a rotatable structure, which can be alternately connected to the feeding hopper 6 and the mud pit. The discharge port of the centrifugal pump 7 is connected to the solids control tank 8, the liquid outlet of the second centrifuge 3 is connected to the solids control tank 8, and the slag outlet of the second centrifuge 3 is connected to the mud pit. The mud pit is used to collect and hold waste liquid. The solids control tank 8 is a prior art, and the specific structure of the solids control tank will not be elaborated here.

[0024] Preferably, two centrifugal pumps 7 are provided. The suction ports of the two centrifugal pumps 7 are connected in parallel, and the discharge ports of the two centrifugal pumps 7 are connected in parallel. The two centrifugal pumps 7 with their suction ports connected in parallel can suck mud from the adjacent solids control tank 8. The discharge ports connected in parallel can either be directly discharged back into the solids control tank 8 for mud transfer between the solids control tanks 8, or can be discharged back into the solids control tank 8 after feeding through the feeding hopper 6 to achieve the function of preparing mud.

[0025] Preferably, a sunshade 11 is fixedly installed on the top of the upper layer of the independent skid base 1, which can provide a shady environment for the operator.

[0026] Preferably, an aisle railing 12 is fixedly installed on the upper layer of the independent skid base 1, which expands the space and meets the requirements of oilfield HSE.

[0027] Preferably, the first centrifuge 2 is a variable-frequency medium-speed centrifuge, and the second centrifuge 3 is a variable-frequency or non-variable-frequency high-speed centrifuge.

[0028] Preferably, the columns of the independent skid base 1 are of telescopic structure. The telescoping of the columns can drive the independent skid base 1 to lift and lower. It is in a high position during the working state to ensure that the liquid discharge of the second centrifuge can flow back to the adjacent solids control tank 8 normally; it is in a low position during the transportation state to facilitate road and railway transportation.

[0029] During operation, as Figure 1 and Figure 3 shown, the feed pump of the first centrifuge 2 sucks the mud to be processed from the adjacent solids control tank 8. After the primary separation by the first centrifuge 2, the liquid is discharged into the collection tank 9 on the independent skid base 1. Large-particle cuttings and large-particle barite enter the mud pit or the feeding funnel 6 through the cuttings discharge pipeline 10. Small-particle cuttings and large-particle barite enter the collection tank 9 along with the liquid. When used for non-weighted drilling fluid, the cuttings discharge pipeline 10 is connected to the mud pit, so as to be directly discharged into the mud pit. When barite needs to be recovered, the cuttings discharge pipeline 10 is connected to the feeding funnel 6, so as to discharge large-particle cuttings and large-particle barite into the feeding funnel 6. The feeding funnel 6 separates large-particle cuttings and barite. The large-particle barite enters the subsequent solids control tank 8 after being circulated by the centrifugal pump 7, while the large-particle cuttings are discarded and discharged. The second feed pump 5 sucks the mud to be processed from the collection tank 9. After the secondary separation by the second centrifuge 3, the liquid containing small-particle barite is discharged into the adjacent solids control tank 8 for collection and storage, and the small-particle cuttings are directly discharged into the mud pit, realizing the secondary filtration of the cuttings in the liquid;

[0030] The suction port of the centrifugal pump 7 can suck mud from the adjacent solids control tank 8. The discharge port can either be directly discharged back into the solids control tank 8 for mud transfer between the solids control tank 8 and the solids control tank 8, or be discharged back into the solids control tank 8 after feeding through the feeding funnel 6, realizing the function of preparing mud;

[0031] Through a set of independent systems, this technical solution associates two centrifuges, their feed pumps, two centrifugal pumps 7, and one feeding funnel 6, which is used to recover barite in the weighted drilling fluid and remove low-density fine harmful solids, and can also be directly used for the treatment of non-weighted drilling fluid. This system reduces the consumption of barite in the mud proportioning, which can not only save costs but also protect the environment.

[0032] The above are only the preferred embodiments of the present utility model, and are not intended to limit the scope of implementation of the present utility model. That is, all equivalent changes and modifications made to the content within the scope of the patent application of the present utility model shall fall within the technical scope of the present utility model.

Claims

1. A system applicable to the recovery of barite in oil fields, comprising an independent skid base (1) divided into upper and lower layers, characterized in that: The upper layer of the independent skid base (1) is equipped with a first centrifuge (2) and a second centrifuge (3), and the lower layer of the independent skid base (1) is equipped with a first liquid supply pump (4) and a second liquid supply pump (5). The first liquid supply pump (4) is connected to the feed inlet of the first centrifuge (2), and the second liquid supply pump (5) is connected to the feed inlet of the second centrifuge (3). A feeding funnel (6) and a centrifugal pump (7) are also installed on the lower layer of the independent skid base (1), and the suction port of the centrifugal pump (7) is connected to the feeding funnel (6). It also includes a solids control tank (8) and a collection tank (9). The solids control tank (8) is connected to the first liquid supply pump (4), and the collection tank (9) is respectively communicated with the liquid outlet of the first centrifuge (2) and the second liquid supply pump (5). It also includes a mud pit. The slag discharge port of the first centrifuge (2) is connected with a cuttings discharge pipeline (10), and the cuttings discharge pipeline (10) is alternately communicated with the feeding funnel (6) and the mud pit. The discharge port of the centrifugal pump (7) is communicated with the solids control tank (8), the liquid outlet of the second centrifuge (3) is communicated with the solids control tank (8), and the slag discharge port of the second centrifuge (3) is communicated with the mud pit.

2. The system applicable to barite recovery in oil fields according to claim 1, characterized in that: There are two centrifugal pumps (7). The suction ports of the two centrifugal pumps (7) are in parallel, and the discharge ports of the two centrifugal pumps (7) are in parallel.

3. The system applicable to barite recovery in oil fields according to claim 1, wherein: A sunshade (11) is provided at the top of the upper layer of the independent skid base (1).

4. The system for recovering barite applicable to oil fields according to claim 1, wherein: An aisle railing (12) is provided on the upper layer of the independent skid base (1).

5. The system applicable to barite recovery in oil fields according to claim 1, characterized in that: The first centrifuge (2) is a variable-frequency medium-speed centrifuge, and the second centrifuge (3) is a variable-frequency or non-variable-frequency high-speed centrifuge.

6. The system applicable to the recovery of barite in oil fields according to claim 1, characterized in that: The columns of the independent skid base (1) are of a telescopic structure, and the telescoping of the columns can drive the independent skid base (1) to lift and lower.

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