Three-dimensional deep composite sand control method for oil and gas wells

Abstract

The invention relates to a three-dimensional deep-formation compound sand control method for an oil and gas well under complex conditions of sand production and accompanying of water channeling, gas channeling or water cut increasing and the like. The method comprises the following steps: determining an optimal formula of a profile control agent; calculating the use quantity of the profile control agent; testing a water injective index of a target well, knowing about the injection capacity of the well, determining the construction pressure range and displacement based on the pressure stability condition, and increasing the effective rate of plugging zone entry by the profile control agent; determining the squeezing manner of the profile control agent, wherein the squeezing pressure is lower than 80% of the formation fracturing pressure; descending a construction pipe string, connecting with a ground pipeline, preparing the profile control agent, and starting a pump truck set to squeeze the profile control agent after sufficient stirring; after squeezing is completed, continuing to inject clear water for over displacement, performing over-displacement on a plugging agent in a shaft, ejecting the plugging agent into a producing formation by certain depth, and guaranteeing that the plugging agent is 3-5 meters away from a well hole; shutting in the well and waiting on cement setting for 24-48 hours; descending a precise microporous compound sand control sieve pipe string, and performing well completion after completing hanging and sealing of sieve pipes.

Description

technical field [0001] The invention relates to a method for downhole operation of oil and gas exploitation, in particular to a three-dimensional deep layer composite sand control method for oil and gas wells under complex conditions such as sand production in oil and gas wells accompanied by water channeling, gas channeling or water content rise. Background technique [0002] Unconsolidated sandstone oil and gas reservoirs have low rock particle cementation strength and are prone to sand production during oil and gas well production, which has many adverse effects on oil and gas field production management. Especially for unconsolidated sandstone oil and gas reservoirs developed by water injection and steam injection, the injection of water and steam can easily reduce the strength of reservoir rocks and intensify the sand production of oil and gas wells. At the same time, due to the long-term sand production of oil and gas wells and the injection of foreign fluids, it is ea...

AI Technical Summary

Problems solved by technology

However, mechanical sand control does not block the large pores with high permeability and high permeability formed inside the reservoir, and cannot solve complex problems such as water channeling, steam channeling, and water content rise; it does not consolidate the loose sand particles inside the reservoir , it is easy to cause erosion of the sand control pipe and reduce the effective period of sand control

The disadvantage of chemical sand control is that the injection agent has aging phenomenon and the validity period is short; the damage to the reservoir is serious, and the production of oil and gas wells decreases after sand control

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