RU2538553C1 - Method of oil pool development - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: method includes injection of disperse polymer system to the formation through injectors interconnected through a pressure manifold and valve manifold to the well pad pumping station (WPPS). According to the method using the above equipment the water conduit is equipped with a water meter and an adjustable gate coupled functionally to the water meter. The mixing plant is connected to the water conduit upstream and downstream the WPPS, which is input for the valve manifold. The disperse polymer system prepared at the mixing plant is injected through the pipeline with the gate at the water conduit being the input for the valve manifold with maintenance of water supplied from the valve manifold at the same consumption rate. It allows injection of the disperse polymer system with required concentration.

EFFECT: improved oil recovery in result of injection of disperse polymer system to the formation through injectors with simplified technology and reduced costs.

1 dwg

Description

The invention relates to the field of the oil industry, in particular to methods for developing oil fields using methods for increasing oil recovery by injecting a mixing unit (CSS) of components with water from a well pump station (SPS) into injection wells of various compositions through a SPS block. The invention provides a reduction in operating costs and an increase in the efficiency of use of CSS components due to the use of new technological schemes for connecting the CSS with BG.

A known method of oil production (patent RU No. 2292450, ЕВВ 43/22, C09K 8/88, publ. 01/27/2007, bull. No. 3), including the preliminary conduct of a complex of hydrodynamic studies and injection into the formation of a composition containing polyacrylamide, aluminum salt and water.

A known method of developing a heterogeneous oil reservoir (patent RU No. 2298088, E21B 43/22, C09K 8/88, publ. 04/27/2007, bull. No. 12) based on the injection into the reservoir of an aqueous dispersion of colloidal particles of polyacrylamide, or polysaccharide, or cellulose ether containing aluminum polyoxychloride.

A known method of developing a heterogeneous oil reservoir (patent RU No. 2431741, E21B 43/22, publ. 10/20/2011, bull. No. 29) based on the injection into the reservoir of an aqueous solution of anionic polymer, chromium acetate and zinc oxide.

The disadvantage of all the analogues of the proposed method is the sequential injection of compositions separately into each well from its mouth. As a result, when injecting formulations into several wells connected with one BG, it is necessary to perform additional work on delivering components to each well, connecting the equipment to the wellhead fittings, injecting the composition into each well, dismantling the equipment and transporting it to another well with repeating operations .

Closest to the technical nature of the proposed method is a method of developing a heterogeneous oil reservoir (patent RU No. 2418156, E21B 43/20, publ. 05/10/2011, bull. No. 13), including the injection into the reservoir through injection wells of a composition in the form of a dispersed polymer system , which is a polymer dispersion containing the polyvalent metal salt at the desired concentration _(SLE)., wherein the pre-selected injection wells communicated with a comb CND. At the mixing plant, a dispersed polymer system is prepared with a concentration of components (C _mouth ) in water for each, determined by the formula

From the _mouth. = _Well V _well / V _mouth ,

where C _mouth. - the concentration of the components of the polymer system prepared at the installation,%;

With _well - the required concentration of the components of the polymer system injected into the wells,%;

V _well - total injectivity of working wells, m ³ / day;

V _mouth - productivity of the mixing plant, m ³ / day,

and cooked for installing the dispersed polymer system is dosed into the water extending from the combs CND to selected wells, injecting in that the polymer system produced at the desired concentration (C _BH.) simultaneously or sequentially to disconnect the wells at the end of the planned volume of injection and reducing the pick-up is not less than 10% of the original.

However, this method of pumping polymer compositions through BG has the following significant disadvantages:

- to connect and disconnect the outlet pipeline of the US with the drainage line of the BG requires significant labor costs to close and open all the valves on the drainage line of the BG;

- when the BG is located close to the pumping station, water is pumped in the BG inlet pipeline at high pressure values (over 10 MPa), therefore, the connection of the US with the inlet of the high pressure BG reduces the service life and industrial safety of the US, and also necessitates the installation of a material-intensive pipeline and valves for supplying water to the DC at high pressure;

- when polymer compositions are injected through the BG and at the same time other geological methods are carried out in the field selected for polymer impact, spasmodic changes in water flow in the BG inlet pipeline occur, which lead to unplanned changes in the concentration of components in the polymer compositions when injected into wells;

- in the absence of a BG drainage line, it is necessary to carry out material-intensive and labor-intensive preparatory work to install a drainage line.

The technical objectives of the invention are to create a simple and effective way to develop an oil field, which allows to reduce the material-intensive and labor-intensive preparatory work for installing the drainage line, to provide the necessary concentration of components in the polymer compositions when injected into the wells, to increase the service life of the CSS and to reduce the material consumption of the pipeline and valves for supply water at US.

Technical problems are solved by a method of developing an oil field, including injection into a formation through injection wells communicated through a pressure collector of one BG, of a composition in the form of a dispersed polymer system with the necessary concentrations of components in the water prepared at the mixing unit, which is inlet connected to the water conduit going to the BG, and with the exit - with wells through pressure water conduits going from the BG.

What is new is that the water supply system is equipped with a flow meter and an adjustable valve functionally connected to the flow meter, the mixing unit is connected to the water supply system before or after the SPS, which is the input to the BG, while the compositions prepared at the mixing installation are pumped through the pipeline with the valve into the water supply, which is the input for BG with the possibility of maintaining at the same level the flow rate of water entering the BG, which allows injection of the polymer system in the required concentration.

The drawing shows a flow chart of the injection of polymer compositions by mixing in the inlet pipe BG without drainage line.

The method of pumping polymer compositions into the inlet pipe BG, communicated with the pressure collector BG, is carried out in the following sequence. From the source of water supply (IW) 1, water flows through the KNS 2 to BG 3 for injection into injection wells. At the same time, part of the water from KNS 2 is supplied to CSS 4 for the preparation of polymer compositions. If, when water is injected, the pressure in the inlet pipe of KNS 2 is much lower than the pressure in the inlet pipe of BG 3 and BG 3 are located quite close to KNS 2, water is supplied to the DC 4 from the KNS 2 intake pipe through pipeline 5 with a valve 6. This allows to increase the service life and industrial safety of the use of CSS 4, as well as reduce material costs for the manufacture of the pipeline 5 and valves 6, which operate at lower pressure.

If, when water is injected, the pressure in the inlet pipe of SPS 2 is slightly different from the pressure in the inlet pipe of BG 3 or BG 3 is removed from the SPS 2, water is supplied to the DC 4 from the inlet pipe of the BG 3 through the pipeline 7 and the valve 8. The compositions prepared for the DC 4 are pumped through a pipe 9 with a valve 10 to the inlet pipe BG 3 and then to the selected injection wells.

To exclude spasmodic changes in the water flow rate in the inlet pipe of the BG 3, leading to unplanned changes in the concentrations of the components in the polymer compositions, an additional flow meter 11 and an adjustable gate valve 12 are installed to maintain the water flow rate in the BG 3 at the same level.

To exclude spasmodic changes in the water flow rate in the inlet pipe of the BG 3, leading to unplanned changes in the concentrations of the components in the polymer compositions, an additional flow meter 11 and an adjustable gate valve 12 are installed to maintain the water flow rate in the BG 3 at the same level.

The proposed method of developing an oil field with the injection of polymer compositions in the pressure head of the BG reduces the material-intensive and labor-intensive preparatory work for installing the drainage line, provides the necessary concentration of components in the polymer compositions when injected into wells, increases the service life of the CSS and reduces the material consumption of the pipeline and valves for water supply on the CSS.

Claims (1)

 A method of developing an oil field, including injection into a formation through injection wells communicated through a pressure manifold of one comb unit - BG with a well pump station - SPS, of a composition in the form of a dispersed polymer system with components in water prepared in a mixing unit, which is connected with the input to the going on the BG with a water conduit, and the outlet - with wells through the discharge water conduits going from the BG, characterized in that the water conduit is equipped with a flow meter and an adjustable valve, functionally connected to the flow meter, the mixing unit is in communication with the water supply system before or after the pumping station, which is the input to the BG, while the dispersed polymer system prepared at the mixing plant is pumped through a pipeline with a valve into the water supply, which is the input to the BG, with the possibility of maintaining the flow rate of the water entering the BG, allowing the injection of a dispersed polymer system in the required concentration.

Images