Application of closed cycle heating energy saving technology for double hollow sucker rod_Industry News_News_Kenli JinXiu Petroleum Machinery Co., Ltd.

Application of closed cycle heating energy saving technology for double hollow sucker rod

2017-11-16 14:20:13	1239 views
Author：管理员

In the process of heavy oil recovery, "double hollow sucker rod internal circulation heating" technology belongs to the wellbore viscosity reduction way. Through field application, compared with the same technology, the effect is more prominent, and the field application is more convenient. Extensive research on heavy oil lifting technology Jinzhou oil production plant of Liaohe Oilfield in this paper, all kinds of heavy oil viscosity reduction technology assisted technology has some limitations in the application range and effect, and can't wait for the extensive spread of coaxial hollow pumping using cyclic heating technology of rod in heavy oil recovery in energy saving effect, and can reduce the viscosity of wellbore viscosity of crude oil and improve the fluidity, oil in wellbore for lifting, can reduce or remove the oil mineral oil, greatly solves the problem of part of heavy oil lifting difficulty of Liaohe oilfield oil production plant of jinzhou.

In the process of heavy oil recovery, the most commonly used wellbore heating and viscosity reduction technology is chemical viscosity reduction, electrical heating, viscosity reduction and hot water viscosity reduction. However, there are some defects in the process of using in the field. The cost of chemical viscosity reduction and electric heating viscosity reduction is higher, and the effect of hot water viscosity reduction is not ideal. The inner circulation heating of double hollow sucker rod has remarkable effect on reducing viscosity of heavy oil well shaft.

First, the basic concept of the device

1. working principle

In the cycle of heating rod coaxial double hollow pumping, the basic working principle of pipe sealing is independent each other through the two miles away, using the ground heating furnace heat carrier heating, and then after the pressurized circulating pump, after the buffer tank and the buffer gas separator, through the four interface using a custom-made. The double hollow pumping rod in the inner channel, high pressure heat carrier circulation pump and driving under the pipe friction wall can restrain the bottom heating speed to flow to the double hollow rod, and then after three double hollow rod outer ring returned to the ground in the furnace to carry out two times heating.

The inner circulation of double hollow sucker rod is a totally enclosed circulation system. The heat carrier does not contact with crude oil and air, so as to prevent the consumption of heat carrier and the leakage.

2. operation characteristics

The use of the transmission shaft of crude oil heating visbreaking; not consume heat carrier, causing environmental and equipment pollution, more conducive to environmental protection; various operation structure is more compact, two-way sealing form strength is taken by the D grade and H grade; operation process more simple and more convenient installation under wells management, makes the operation easier.

3. device structure

Double hollow sucker rod not only need to have the special performance of two-way sealing, change the kinetic energy and potential energy also need to bear large tension and long time, in order to prevent fatigue and break off the situation, the use of external pipeline endurance quality alloy steel better, after cold rolling and quenching medium further processing is completed, because the pipe from the space constraints, but also need to complete the high insulation operation, so the choice of 1Crl8Ni9Ti stainless steel processing Q9 made the size 2mmx2mm of the external pipe laying micron other polyurethane filled little hollow particles used in aerospace engineering, through constant pressure, constant temperature and quantitative processing operation is completed shape after forming insulation thermal conductivity layer can not be more than 0.02. when the difference in temperature reached 40 degrees Celsius, in order to ensure the well bottom The heating is more stable and reliable, and it needs to keep the heat dissipation within 50% numerical range, so as to meet the requirements of heating conditions in the deep oil well. It needs more than the crude oil solidification and wax precipitation temperature.

Two 、 field application effect

1. field use

The operation is the use of double hollow rod 1180 meters, and equipped with ground operating equipment, began to operate underground in November. Softened water needs to be pressurized by circulating pump at first, then it is heated to 90 degrees Celsius after heating furnace, then it starts circulating operation. When the softened water is preheated to 70 degrees away from the outlet, the soft water is opened, and the flushing rate is raised from 1 times to 2.5 times.

From the job well open until August this year, the cumulative production of more than one hundred days, the average daily production is 12. Before the measures were taken, the load of the pumping unit was too large to affect the production after the measures were prevented. The former type 10 pumping unit was replaced by a 12 type machine. After the measures, the current was 38/32A, the stroke was 5 meters, and the stroke was 2.5 times.

Three, the specific production and use efficiency

1. compared with the traditional wellbore viscosity reduction method, its field application advantages are very obvious. Specific parameters are listed below.

2. high export temperature, obvious effect of increasing production

Conventional heavy oil, the use of double hollow rod inner loop heating operation process, after the circulating water outlet temperature can reach 85 degrees Celsius above, wellhead crude oil temperature can reach 53 degrees Celsius to 69 degrees Celsius, has very good viscosity reducing effect.

3. double hollow rod wear better effect

Double hollow rod bearing outer tube is the choice of good quality steel, after cold rolling and processing into intermediate frequency adjustment, compared with common sucker rod, the rod is better wear resistance, can effectively reduce the influence caused by wear because of oil production, lengthen the working time of the.

4. double hollow rod convenient maintenance

The inner pipe is fixed in each hollow rod by screw, and is connected into a section. In the work, tighten the outer pipe thread internal rod can realize automatic splicing, the two together. The ground work also does not need the specialized facility to do the work arrangement, the electric heating cable and the connecting rod compares, the engineering quantity is not big. At the same time, the double hollow rod is also passed through one

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