A method of operating an oil production well

 

The invention relates to the field of the oil industry and contributes to the efficiency of operation of the production well. Ensures the prevention of the formation at the bottom of sand and clay or liquid tube. The inventive method includes downhill tubing centrifugal pump and separator. According to the invention before its descent centrifugal pump and separator in the borehole with a focus on the bottom or sump set the packer and the shank of the tubing with a perforated bottom. This allows you to create the desired speed of the upward flow of formation fluids for removal from the bottom of produced water and mechanical impurities. Raspaculo packer carried out due to weight centrifugal pump, separator and part of the weight of the upstream column tubing. 1 Il.

The present invention relates to the field of oil industry, namely to increase the efficiency of operation of the production well.

The known method of operation of the production well, including drilling, the slope of the production string and its cementeros due to the energy of the productive formation (see Amelin, I. D., Andriasov R. S., Gimatdinov W. K., and others, Exploitation and development of oil and gas fields. Nedra, 1978, S. 154-175).

The disadvantages of this method are the following:

- fairly short period of wellhead production due to the reduction in reservoir pressure and water cut in crude production;

- often relatively low flow rate because of the impossibility of creating increased depression on a layer.

Closest to the proposed method is a method of mechanized oil production, including drilling, descent, cementing, perforation of the production string, the well completion, downhill tubing downhole pump, such as electrical submersible pump (ESP), followed by oil and then watered products using ESP (see Amelin I. D., Andriasov R. S., Gimatdinov W. K., and others, Exploitation and development of oil and gas fields. Nedra, 1978, S. 239-248).

The disadvantage inherent in the method under consideration is high suspension tubing, i.e., when the tubing is at a considerable distance from the borehole bottom.

This is because the design of the ESP is not possible to hold large or overweight prikacene savings on the tubing. It means that all production wells in Russia or constructive reasons, or to reduce the cost structure are operated with high pendants tubing. This fact leads to the following negative consequences.

Well the space from the bottom to the tubing has a cross section that is several times superior to that of a section of tubing. In addition, the flow rate of the produced fluid (oil+water) increases from zero at the bottom hole to the maximum size of tubing. This means that the space is a good separator. The result is carried from the reservoir mechanical impurities in the form of remnants of mud, cement, sand productive reservoir, products, abrasive wear, corrosion deposited on the borehole bottom. On hole accumulates also produced water or water coming into the well because it leaks. The consequence of the formation at the bottom of sand and clay, mud, liquid tube is

- serial disconnected from the drainage of the lower perforations;

- reduction in time of the flow rate as the fluid, and oil;

- reduction of reservoir sweep generowanego of the invention is to provide a method of operation of the production well, ensuring the prevention of the formation at the bottom of sand and clay or liquid tube that prevents serial disconnected from the drainage perforations, the reduction of oil output, the lower end KEAN.

The task is achieved in that in the method of operation of the production well providing downhill tubing centrifugal pump and separator, used the shank of the tubing with a perforated bottom portion, with a focus on the bottom that allows you to create the desired speed of the upward flow of formation fluids for removal from the bottom of produced water and solids, as well as the fact that:

shank with a focus on the bottom is set to the descent ESP and separator;

under an electric motor is attached to the pipe with filter holes and the guide cone;

- respecrive packer at the expense of the weight of the ESP, the separator and part of the weight of the upstream tubing;

in the case of fountain operation of the column tubing with perforated holes directly installed with an emphasis on the face.

The way his illustration in the drawing is as follows.

After focusing on the face down pipe “shank” 7 with a set of centralizers 8 and a filter 9 holes opposite the productive formation or below this interval.

On the tubing string 3 is lowered ESP 4 with the separator, a pipe with a filter 5 and the guide cone 10 (see drawing). While packer with a focus on the face in the upper part connects with the “load” of the packer 11, sufficient to respitrace. The shank 7 with packer 6 and “load” 11 lowered into the well on the desktop tool to descent ESP.

Well run. The extracted product through openings in the lower part of the shank 9 is fed into the shank. As a result, in the shank with the flow of formation fluid received mechanical particles remains of drilling mud, cement, corrosion products, destruction of the skeleton of the productive reservoir.

In the process of lifting the shank of the extracted fluid and particles due to the reduction of pressure is the degassing of oil. After passing through the pipes of the shank and the “load” 11 carbonated liquid flows into the annulus.

Then the extracted product is directed into the separator. The separated oil with produced water and mechanical impurities is fed to the receiving ESP and the tubing string is served at the wellhead.

Separated in the separator gas enters the annulus. Here the gas voltage is the column tubing for the implementation of useful work to lifereview of products produced.

In the case of wellhead production implementation of the proposed method is significantly simplified, since there are eye-catching in the tubing of oil dissolved gas does positive role lifereview of products produced, and the use of structural elements required for the use of ESP is not required. Unlike the traditional approach of the column tubing with perforated bottom pipe is lowered with a focus on the bottom or sump of the well.

Thus, in contrast to the traditional approach in the proposed method, there are no conditions for the deposition of solids, the formation of sand-clay, mud tubes or trap, which can have a negative impact on the processes and performance of oil recovery.

An example implementation of

The main oil reservoir Irivonskaya field, located in the Saratov region, lies at a depth of about 550 m from the field in the 90-ies drilled a number of wells horizontal drilling technologies. They are characterized by low productivity. It would seem that the increased viscosity of the oil (about 10 MPaC) no flooding of productive reservoir completely explained the situation with low rates of horizontal wells with different trajectory is Elano the assumption of the presence in these wells mud tubes.

To check the assumptions made in SLE. No. 49. This well is operated oil pump with a depth of 300 m Length inclined to the horizontal shaft 75 m

According to the recommendations of the wells were extracted tubing and pump. Then began washing the face with a continuous extension of the casing up to the level of the initial slaughter.

As a result of the operation of the wells was removed about 2.5 m3remnants of mud and cement.

If flushing the borehole was mined per day about 1 t of oil and 1 m3water, after washing the flow rate of the liquid was 9 m3per day, and oil - 6 t/d. This was due to the initiation of the drainage just opened the productive interval, for 2.5 m3retrieved mud tubes almost completely blocked the entire drilled interval in the reservoir. However, due to the shallow depth of the reservoir, low gas factor was not taken down the shank on these technologies. It was enough to increase the depth of the tubing hangers.

Thus, it seems that the proposed approach to the exploitation of the production well will allow characterized by novelty items, required for a patent.

Claims

A method of operating an oil production well, including downhill tubing centrifugal pump and separator, characterized in that before the descent of electrical submersible pump and separator in the borehole with a focus on the bottom or sump set the packer and the shank of the tubing with a perforated bottom that allows you to create the desired speed of the upward flow of formation fluids for removal from the bottom of produced water and solids, raspaculo packer carried out due to weight centrifugal pump, separator and part of the weight of the upstream column tubing.

 

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2 dwg

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25 cl, 1 tbl, 3 ex

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