Wellhead pulse-type dosing device and dosing method in single-well production

Abstract

The present application relates to single well production technical field, it is a kind of wellhead pulse type dosing device and dosing method in single well production, the former includes crude oil wellhead, medicine tank, polished rod, oil towing machine, auxiliary production pipeline and single well metering station, the latter is carried out according to the following method: production reagent is sent to the bottom of medicine tank, when the polished rod upstroke, the crude oil and gas in production main pipe are brought into auxiliary production pipeline, part of crude oil and gas on the left side of auxiliary production pipeline enters the inside of medicine tank, gas gathers to the top of medicine tank, crude oil and reagent gather to the bottom of medicine tank;When the polished rod downstroke, production reagent and crude oil are brought into left side auxiliary production pipeline by the gas discharged in medicine tank, after mixing with another part of crude oil and gas, it is sent to single well metering station.The present application realizes wellhead automatic closed pulse type dosing according to the pressure difference of the up-and-down reciprocating motion of polished rod, its operation is simple and production cost is low, not only can quickly reduce wellhead back pressure, but also can reduce environmental pollution risk, improve on-site staff work efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of single well production, and is a wellhead pulse type dosing device and a dosing method in single well production. BACKGROUND

[0002] Wellhead back pressure mainly refers to the flow resistance of the crude oil produced from the formation to the ground pipeline between the oil well and the metering station, and is an important parameter affecting the yield of the oil well. During the development of the oilfield, the wellhead back pressure should be maintained within a reasonable range (≤2.5 MPa), and when the wellhead back pressure is high, the yield of the oil well will certainly be affected, thereby causing certain economic losses to the oilfield unit. If the high back pressure condition is not discovered in time, it will cause pressure change, flange leakage, environmental pollution, waste of manpower and material resources, and affect production.

[0003] At present, the main ways to deal with high back pressure in the crude oil production site are well washing and using a pipeline heater to warm the pipeline. Both of the above two ways have the disadvantages of high cost, large workload and low efficiency. SUMMARY

[0004] The present application provides a wellhead pulse type dosing device and a dosing method in single well production, which overcomes the shortcomings of the prior art, and effectively solves the problems of high wellhead back pressure in crude oil production, high cost and large workload and low efficiency in dealing with back pressure.

[0005] One of the technical solutions of the present application is realized by the following measures: a wellhead pulse type dosing device for single well production, comprising a crude oil wellhead, a medicine tank, a polished rod, an oil dragging machine, a secondary production pipeline and a single well metering station, the crude oil wellhead is fixedly connected with a production main pipeline, the secondary production pipeline crosses the production main pipeline and is connected therewith, the secondary production pipeline is divided into a left secondary production pipeline and a right secondary production pipeline through the production main pipeline, a polished rod capable of reciprocating is arranged in the production main pipeline, a rope is fixedly connected between the top end of the polished rod and the oil dragging machine, a rubber valve is arranged at the top of the production main pipeline, a packing is arranged at the top of the rubber valve, a dosing hopper is arranged at the top of the medicine tank, a medicine inlet pipeline is fixedly connected between the outlet at the bottom of the medicine tank and the left secondary production pipeline, a single well pipeline is fixedly connected between the right secondary production pipeline and the single well metering station, a first production valve is arranged between the right end of the left secondary production pipeline and the production main pipeline, and a second production valve is arranged between the left end of the right secondary production pipeline and the production main pipeline.

[0006] The following is a further optimization or / and improvement of the above-mentioned one of the technical solutions:

[0007] The outlet at the bottom of the dosing hopper is fixedly connected with a dosing pipeline, and a dosing control valve is fixedly installed on the dosing pipeline.

[0008] The left end of the left side auxiliary production pipeline is fixedly communicated with a first venting pipeline, and a first venting valve is fixedly installed on the first venting pipeline.

[0009] The upper outlet of the medicine tank is fixedly communicated with a third venting pipeline, and a third venting valve is fixedly installed on the third venting pipeline.

[0010] The controller is further included, and a crude oil output control valve is fixedly installed on the single well pipeline, and the first production valve, the second production valve, the dosing control valve, the first venting valve, the second venting valve, the third venting valve, the medicine tank control valve and the crude oil output control valve are electrically connected with the controller.

[0011] The second technical scheme of the present application is realized by the following measures: a dosing method of a wellhead pulse type dosing device in single well production, which is performed according to the following method: first, production medicaments are sent to the bottom of a medicine tank through a dosing funnel; second, when the optical rod is ascending, crude oil and gas in a production main pipeline are brought into an auxiliary production pipeline, part of the crude oil and gas enters the left side of the auxiliary production pipeline, and the other part of the crude oil and gas enters the right side of the auxiliary production pipeline; third, part of the crude oil and gas on the left side of the auxiliary production pipeline enters the inside of the medicine tank through a dosing pipeline, the pressure in the medicine tank is continuously increased, the gas is gathered to the top of the medicine tank, and the crude oil and the medicaments are gathered to the bottom of the medicine tank; fourth, when the optical rod is descending, the pressure in the left side auxiliary production pipeline is gradually decreased, the production medicaments and the crude oil at the bottom of the medicine tank are brought into the left side auxiliary production pipeline by the gas discharged from the medicine tank, and then the production medicaments and the crude oil are mixed with the other part of the crude oil and gas on the right side of the auxiliary production pipeline and automatically enter a single well pipeline; and fifth, the crude oil and the gas mixed with the production medicaments are sent to a single well metering station through the single well pipeline.

[0012] According to the pressure difference of the up-and-down reciprocating motion of the optical rod, the wellhead automatic sealing pulse type dosing is realized, the operation is simple, the production cost is low, the wellhead back pressure can be quickly reduced, the environmental pollution risk can be reduced, and the work efficiency of the on-site staff can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] ATTACHMENT Figure 1 The figure is a process flow diagram of the present application.

[0014] The codes in the attached diagram are as follows: 1 for crude oil wellhead, 2 for chemical tank, 3 for polished rod, 4 for tractor, 5 for single-well metering station, 6 for main production line, 7 for left-side auxiliary production pipeline, 8 for right-side auxiliary production pipeline, 9 for rope, 10 for rubber valve, 11 for packing, 12 for chemical dosing funnel, 13 for chemical inlet pipeline, 14 for single-well pipeline, 15 for first production valve, 16 for second production valve, 17 for chemical dosing pipeline, 18 for chemical dosing control valve, 19 for first vent pipeline, 20 for first vent valve, 21 for second vent pipeline, 22 for second vent valve, 23 for third vent pipeline, 24 for third vent valve, 25 for chemical tank control valve, and 26 for crude oil output control valve. Detailed Implementation

[0015] This invention is not limited to the following embodiments; specific implementation methods can be determined according to the technical solutions and actual conditions of this invention. Unless otherwise specified, the equipment and apparatus used in this invention are all existing, publicly known, and commonly used equipment and apparatus in the art.

[0016] The present invention will be further described below with reference to embodiments:

[0017] Example 1: As shown in the attached document Figure 1 As shown, the wellhead pulse dosing device for single-well production includes an oil wellhead 1, a chemical tank 2, a polished rod 3, a trailer 4, auxiliary production pipelines, and a single-well metering station 5. The oil wellhead 1 is fixedly connected to a main production line 6. The auxiliary production pipeline crosses the main production line 6 and is connected to it. The auxiliary production pipeline is divided into a left auxiliary production pipeline 7 and a right auxiliary production pipeline 8 via the main production line 6. A polished rod 3 capable of reciprocating motion is fitted inside the main production line 6. A rope 9 is fixedly connected between the top of the polished rod 3 and the trailer 4. The unit is equipped with a rubber valve 10, and a packing 11 is installed on the top of the rubber valve 10. A dosing funnel 12 is installed on the top of the medicine tank 2. A medicine inlet pipeline 13 is fixedly connected between the bottom outlet of the medicine tank 2 and the left auxiliary production pipeline 7. A single well pipeline 14 is fixedly connected between the right auxiliary production pipeline 8 and the single well metering station 5. A first production valve 15 is installed between the right port of the left auxiliary production pipeline 7 and the main production pipeline 6. A second production valve 16 is installed between the left port of the right auxiliary production pipeline 8 and the main production pipeline 6.

[0018] As needed, during the production process, the rubber valve 10 is in the open state, and the packing 11 plays a sealing role. After a period of use, the packing 11 wears out, and crude oil leaks. The packing 11 needs to be replaced. At this time, the machine must be stopped, the rubber valve 10 is closed to play a temporary sealing role, and then the packing 11 is replaced manually. After the packing 11 is replaced, the rubber valve 10 is opened and production is resumed.

[0019] Example 2: As an optimization of the above examples, as shown in the appendix Figure 1As shown, the bottom outlet of the dosing funnel 12 is fixedly communicated with the top inlet of the medicine tank 2, and a dosing pipeline 17 is fixedly installed between the bottom outlet of the dosing funnel 12 and the top inlet of the medicine tank 2, and a dosing control valve 18 is fixedly installed on the dosing pipeline 17.

[0020] Embodiment 3: As an optimization of the above-mentioned embodiments, as shown in the accompanying Figure 1 As shown, the left end of the left-side auxiliary production pipeline 7 is fixedly communicated with a first venting pipeline 19, the first venting pipeline 19 is fixedly installed with a first venting valve 20, the right end of the right-side auxiliary production pipeline 8 is fixedly communicated with a second venting pipeline 21, and the second venting pipeline 21 is fixedly installed with a second venting valve 22.

[0021] Embodiment 4: As an optimization of the above-mentioned embodiments, as shown in the accompanying Figure 1 As shown, the upper outlet of the medicine tank 2 is fixedly communicated with a third venting pipeline 23, the third venting pipeline 23 is fixedly installed with a third venting valve 24, and the dosing pipeline 13 is fixedly installed with a medicine tank control valve 25.

[0022] According to the needs, when the production is abnormal, the first venting valve 20, the second venting valve 22, the third venting valve 24 and the medicine tank control valve 25 can be used for timely pressure relief.

[0023] Embodiment 5: As an optimization of the above-mentioned embodiments, as shown in the accompanying Figure 1 As shown, a controller is further included, the crude oil output control valve 26 is fixedly installed on the single-well pipeline 14, and the first production valve 15, the second production valve 16, the dosing control valve 18, the first venting valve 20, the second venting valve 22, the third venting valve 24, the medicine tank control valve 25 and the crude oil output control valve 26 are electrically connected with the controller.

[0024] The pipelines and equipment of the wellhead pulse-type dosing device in the single-well production can be further provided with conventional valves, thermometers, liquid level meters and pressure gauges commonly known in the art according to the production needs, and when the equipment and pipelines are fixedly connected, threaded connection can be used to avoid welding, so that the installation is convenient.

[0025] Embodiment 6: As shown in the accompanying Figure 1As shown, the single well production wellhead pulse type dosing device dosing method is carried out according to the following method: first, the production reagent is sent to the bottom of the medicine tank 2 through the dosing funnel 12; second, when the optical rod 3 is ascending, the crude oil and gas in the production main pipe 6 are brought into the auxiliary production pipeline, part of the crude oil and gas enters the left side of the auxiliary production pipeline, and the other part of the crude oil and gas enters the right side of the auxiliary production pipeline; third, part of the crude oil and gas on the left side of the auxiliary production pipeline enters the inside of the medicine tank 2 through the medicine pipeline 13, the pressure in the medicine tank 2 increases continuously, the gas is gathered to the top of the medicine tank 2, and the crude oil and the reagent are gathered to the bottom of the medicine tank 2; fourth, when the optical rod 3 is descending, the pressure in the left auxiliary production pipeline 7 gradually decreases, the production reagent and the crude oil at the bottom of the medicine tank 2 are brought into the left auxiliary production pipeline 7 by the gas discharged from the medicine tank 2, and after mixing with the other part of the crude oil and gas on the right side of the auxiliary production pipeline, the mixture automatically enters the single well pipeline 14; fifth, the crude oil and gas mixed with the production reagent are sent to the single well metering station 5 through the single well pipeline 14.

[0026] The present application is suitable for single well production wells with high back pressure, and the pressure difference formed by the up-down reciprocating movement of the optical rod 3 realizes automatic pulse type dosing of the crude oil at the wellhead, which not only reduces the yield loss caused by high wellhead back pressure, but also reduces the risk of environmental pollution, reduces the environmental protection treatment cost, and moves the risk prevention and control port forward, improving the work efficiency of the site staff.

[0027] At present, the main ways to deal with high back pressure in crude oil production sites are well washing and using a pipeline heater to warm the pipeline.

[0028] Using the well washing method: about 10m³ of water is consumed for each well washing, the price of water is 80 yuan per cubic meter, and the well is washed about once every 3 to 5 days, so the annual well washing cost of each well is about 60,000 yuan.

[0029] According to the calculation of washing the well once every 5 days: 10m³×80 yuan×365 days÷5 days=58,400 yuan

[0030] Using the pipeline heating method:

[0031] The rated power of the pipeline heater is 30KW·h, and the electricity cost is 0.5 yuan per degree, so the annual electricity cost of each well is about 130,000 yuan;

[0032] 30kw·h×0.5 yuan / degree×24h×365=131,400 yuan

[0033] After using the present application, the well washing time can be prolonged, and the well is washed once every 1 to 3 months, so the annual well washing cost of each well can be saved by about 50,000 yuan.

[0034] In summary, the application realizes automatic sealing and pulse type dosing of wellhead according to pressure difference of up and down reciprocating movement of the polished rod, has simple operation and low production cost, can not only quickly reduce wellhead back pressure, but also reduce environmental pollution risk and improve work efficiency of on-site staff.

[0035] The above technical features constitute embodiments of the application, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the needs of different situations.

Claims

1. A method for dosing in a single well production wellhead pulsed dosing device, characterized by Perform the following steps: The first step is to send the production reagent to the bottom of the medicine tank for storage via a dosing funnel; The second step is to bring the crude oil and gas in the main production pipe into the auxiliary production pipeline when the rod is in motion. Part of the crude oil and gas enters the left side of the auxiliary production pipeline, and the other part of the crude oil and gas enters the right side of the auxiliary production pipeline. Third, some crude oil and gas from the left side of the auxiliary production pipeline enter the tank through the inlet pipeline. The pressure inside the tank increases continuously, gas accumulates at the top of the tank, and crude oil and chemicals accumulate at the bottom of the tank. Fourth step: When the polished rod is in the downward stroke, the pressure in the left auxiliary production pipeline gradually decreases. The production reagent and crude oil at the bottom of the reagent tank are carried into the left auxiliary production pipeline by the gas discharged from the reagent tank. After mixing with another part of crude oil and gas on the right side of the auxiliary production pipeline, they automatically enter the single well pipeline. The fifth step involves mixing the crude oil and gas with the added production reagents and then sending them to the single-well metering station via a single-well pipeline. The single-well production wellhead pulse dosing device includes an oil wellhead, a dosing tank, a polished rod, a trailer, a secondary production pipeline, and a single-well metering station. The oil wellhead is fixedly connected to a main production line. The secondary production pipeline crosses the main production line and is connected to it. The secondary production pipeline is divided into a left secondary production pipeline and a right secondary production pipeline through the main production line. A polished rod capable of reciprocating motion is fitted inside the main production line. A rope is fixedly connected between the top of the polished rod and the trailer. A rubber valve is installed at the top of the main production line, and a packing gland is installed at the top of the rubber valve. A dosing funnel is installed at the top of the dosing tank. A dosing inlet pipeline is fixedly connected between the bottom outlet of the dosing tank and the left secondary production pipeline. A single-well pipeline is fixedly connected between the right secondary production pipeline and the single-well metering station. A first production valve is installed between the right end of the left secondary production pipeline and the main production line, and a second production valve is installed between the left end of the right secondary production pipeline and the main production line.

2. The dosing method of the wellhead pulse dosing device in single-well production according to claim 1, characterized in that... A dosing pipeline is fixedly connected between the bottom outlet of the dosing funnel and the top inlet of the medicine tank, and a dosing control valve is fixedly installed on the dosing pipeline.

3. The dosing method of the wellhead pulse dosing device in single-well production according to claim 1 or 2, characterized in that... The left side auxiliary production pipeline is fixedly connected to the left end of the first vent pipeline, and the first vent pipeline is fixedly installed with the first vent valve. The right side auxiliary production pipeline is fixedly connected to the right end of the second vent pipeline, and the second vent pipeline is fixedly installed with the second vent valve.

4. The dosing method of the wellhead pulse dosing device in single-well production according to claim 3, characterized in that... The upper outlet of the medicine tank is fixedly connected to a third venting pipeline, and a third venting valve is fixedly installed on the third venting pipeline. The medicine tank control valve is fixedly installed on the medicine inlet pipeline.

5. The dosing method of the wellhead pulse dosing device in single-well production according to claim 4, characterized in that... It also includes a controller. A crude oil output control valve is fixedly installed on the single well pipeline. The first production valve, the second production valve, the chemical dosing control valve, the first vent valve, the second vent valve, the third vent valve, the chemical tank control valve, and the crude oil output control valve are all electrically connected to the controller.

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