SU1609976A1 - Method of removing liquid from well - Google Patents

Abstract

The invention relates to the oil and gas industry and can be advantageously used at the late stage of the development of gas and gas condensate fields. The purpose of the invention is to increase the efficiency of fluid removal from the well. To implement the method, when the valve is open on the annular space, a water solution of the sugar industry (deficit) and foaming surfactant, for example TEAL - M, a solution of tar oil in vegetable oil and hydrochloric acid are sequentially pumped into the well through the tubing. They are pumped with water or oil, or gas, or air until the hydrochloric acid is completely released from the tubing into the well, where it interacts with the deficit. As a result, carbon dioxide is released and foaming of the fluid removed from the well followed by removal of this fluid to the surface. In addition, the belt possesses high inhibiting properties from carbon dioxide corrosion and forms a protective layer on the inner and outer surfaces of the tubing, as well as on the inner surface of the production string. 2 tab.

Description

The invention relates to the oil and gas industry, in particular to methods for removing fluid from a well, and can advantageously be used in the late stage of development of gas and gas condensate fields.

The aim of the invention is to increase the efficiency of fluid removal from the well.

The deficat used in the process as a gassing agent (waste products from the sugar industry) contains 70-75% chalk (CaCoS) and 25-30% fine particles insoluble in hydrochloric acid. Vegetable oil tar (GRM) is a paste-like non-flammable and non-toxic substance with mol. 300-310, insoluble in water and unlimited soluble in petroleum products. RM has the properties of an inhibitor of carbon dioxide, the protective effect reaches 98%.

Tests have shown that in the interaction of 1 kg of deficate and hydrochloric acid (of various concentrations) the reaction proceeds. chi: CaCO3 + 2HCI CaCIa + NaO + COA, with the release of carbon dioxide under normal conditions 201.6. The amount of hydrochloric acid of various concentrations per 1 kg of the certificate required for the complete interaction of the components is given in table. 1. To implement the method number

oh oh oh

N4

Och

Deficient and hydrochloric acid are selected from the condition of obtaining carbon dioxide in a volume equal to the volume of the well (taking into account the pressure in it) from which the liquid is removed.

in the solution of the GRM and hydrocarbon head, the components of the bone are taken in the ratio x + oil (with a density not higher than 0.95) 1: 3; GRM + gas condensate or salt 1; 2; ГРМ-ь + kerosene 1: 1.

At the T8KY ratios of the GRM and hydrocarbon fluid, the section / whole medium has almost the same viscosity, fluidity and adsorption properties (stickiness).

The estimated amount of the separation medium, taking into account the attainment of a maximally high overhang of 0.5 m per 1000 m of the length of the tubing.

As a foaming surfactant, the use of TEA1-M reagent is most effective. The amount of surfactant, which is chosen depending on the composition and salinity of the liquid being removed, is 3.0–10% of the latter.

The method is carried out as follows.

Based on the volume of a specific well (production column) and mineralization of the liquid being removed, the necessary quantities of the detergent, hydrochloric acid, an aqueous solution of TEAS-1 surfactant or other foaming surfactant, timing and hydrocarbon liquids are determined by calculation. By intensively moving, a solution of the deficate and TEAS-M (the first solution) and a timing solution in the hydrocarbon liquid (separation liquid) are prepared separately.

With the valve open on the annular space, the first solution, separation liquid and hydrochloric acid are sequentially pumped into the well through the tubing. Then, hydrochloric acid is pumped with water, or oil, or gas, or air until complete extraction of hydrochloric acid from the tubing into the well, where it interacts with the deficit. Close the gate valve and supply well production to the line,

In the interaction of hydrochloric acid with

carbon dioxide is released by the deficiency, which foams the liquid at the bottom of the well, forms a three-phase foam due to the content of insoluble in the defi

hydrochloric acid particles, followed by the removal of this fluid, which entails the influx of hydrocarbons from the reservoir and an increase in well productivity. In addition, the timing, having a high polarity of molecules, forms a protective inhibitory layer on the inner and outer surfaces of the tubing, as well as on the inner surface of the production string. Following the GRM pumped solution of hydrochloric acid.

To maintain high well productivity, the method is applied periodically as its productivity decreases,

Table 2 shows the results of fluid removal from the well model by this method and the method of the prototype.

Claims (1)

Invention Formula A method of removing fluid from a well, which involves injecting a mixture of a surfactant with a gassing agent and hydrochloric acid into the well, characterized in that to increase the efficiency of fluid removal from the well, a mixture of the surfactant with the gassing agent and hydrochloric acid is pumped into the well sequentially, and before by pumping hydrochloric acid into the well, a solution of vegetable oil tar oil in the hydrocarbon fluid is additionally pumped as a separation medium, and waste gas from the production of the sugar industry (deficit) is used as a gaseous reagent. Table 1 Continuation of table 1 Table 2