Gas well thawing method

FIELD: oil and gas production industry, particularly for well thawing.

SUBSTANCE: method involves lowering flushing pipe string of lesser diameter into producing tube; flushing well bore with hot technological solution and lengthening flushing pipes as hydrate ice block damages, wherein potassium chloride electrolyte is used as the technological solution.

EFFECT: increased reliability and efficiency.

 

The invention relates to the oil and gas industry, namely the thawing gas wells.

There is a method of thawing gas wells, including the descent into the internal cavity of the Elevator pipe string, an additional column of drilling pipes of smaller diameter, flush the hot barrel technological solution with increasing flushing pipes as destruction hydrate-ice tube [RF Patent №2176724, IPC 7 E 21 In 37/00, published in 2001].

The disadvantage is significant duration and low efficiency of destruction hydrate-ice tube when used as a flushing technological solution is an aqueous solution of calcium chloride, as well as a greater likelihood of obtaining high-viscosity suspension by the interaction of calcium chloride with mud, which will additionally cover the wellbore.

The challenge when creating the invention is to develop a method to improve the reliability and efficiency of works on thawing gas wells.

The technical result is the provision of conditions for heat wells with minimal capital and operating costs.

This technical result is achieved by the known method of thawing gas wells, including a descent into the inner Polo is th tubing pipe string, an additional column of drilling pipes of smaller diameter, rinse the barrel hot technological solution with increasing flushing pipes as destruction hydrate-ice tube, unlike the prototype, as a technological solution is a solution of potassium chloride is the electrolyte.

Potassium chloride is the electrolyte produced according to TU 1714-453-05785388-99 and represents gray granules with a particle size of from 3 to 5 mm potassium chloride is the electrolyte is a by-product in the production of magnesium by electrolysis of carnallite, is used as flux in metallurgical industry, as well as in agriculture for soil for growing agricultural crops. The composition of the product product potassium chloride is the electrolyte, wt.%: potassium chloride (KCl) is not less than 68 (in terms of oxide potassium K2Of not less than 43); magnesium chloride (MgCl2) not less than 4-9 (in terms of magnesium oxide MgO is at least 1.7 to 3.8); sodium chloride (NaCl) 12-24 (in terms of sodium oxide Na2O 6-13); calcium chloride (l2) 0,7-1,4 (in terms of calcium oxide Cao 0.4 to 0.7); water not more than 4.0. He never gets frozen, toxic compounds in the air does not form, non-flammable, pozharovzryvobezopasen, hygroscopic. The degree of impact on the body belongs to the 3rd class of hazard. Certificate of use of this product in the oil and gas industry: 153.39.RU.245860.00.560.10.03 from 8.10.03,

The way of implementing what is in the following way.

In lifting the string of pipe is additionally down the column of drilling pipes of smaller diameter to the depth location of hydrate-ice tube. Prepare a solution of potassium chloride is the electrolyte, according to the required density, and heated to a temperature of 60°using steam installation. Through the column of drilling pipes pumped to a heated solution of potassium chloride is the electrolyte and washed them wellbore, creating circulation in the annular space between the wash and Elevator pipes. As destruction hydrate-ice tube producing capacity of the column of drilling pipes with the descent into the borehole to the complete destruction of hydrate-ice tube. After the complete destruction of hydrate-ice plugs continue the descent of the wash pipe to the bottom of the borehole with the purpose of thawing the entire wellbore. After unfreezing the wellbore (as evidenced by the restoration of circulation in the annulus of the well between the casing lift pipes and the production column) of the wash pipe is removed from the well. Washed the wellbore by pumping heated solution of potassium chloride is the electrolyte in the Elevator column pipes, creating circulation in the pipe and the annular space of the well. The well is completed and put into operation.

The proposed technology provides efficiency is ü destruction hydrate-ice caps and thawing wellbore with minimal costs without receiving any high-viscosity slurry, to seal the wellbore and the reservoir.

Method heat a gas well, including the descent into the internal cavity of the Elevator pipe string, optional column of drilling pipes of smaller diameter, flush the hot barrel technological solution with increasing flushing pipes as destruction hydrate-ice tube, characterized in that as a technological solution using a solution of potassium chloride is the electrolyte.



 

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