Method for preparing nano-micron autolysis temporary plugging diverter
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A nano-micron, diverting agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as permanent formation blockage, tackifier polymer residues, and difficult recovery of formation permeability damage, etc. The effect of formation permeability recovery, simple preparation method and good plugging performance
Inactive Publication Date: 2018-04-20
CNPC BOHAI DRILLING ENG
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However, these two methods have certain limitations: chemical particle diversion technology, whether it is oil-soluble resin or water-soluble resin, although it can form a filter cake on the wall of the wellbore or fracture and then block the high-permeability area to achieve the purpose of diverting acid fluid. purpose, but the particles of this type of organic resin are very sensitive to natural fractures in the formation, which mainly form filter cakes on the fracture walls so that they cannot reach deeper layers
Second, mos...
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[0019] The preparation method of nano-micron-scale self-dissolving temporary plugging diversion agent for acidification of the present invention comprises the following steps:
[0020] (1) At room temperature, measure a certain amount of water and add an iron ion stabilizer, a clay stabilizer, a drainage aid, and a high-temperature corrosion inhibitor to it and stir to obtain a mixed solution I;
[0021] (2) Continue to add dispersant to mixed solution I and stir, then add suspending agent and sodium chloride and stir for 3-10min to obtain mixed solution II;
[0022] (3) Measure concentrated hydrochloric acid, slowly add in mixed solution II and constantly stir 10-30min, obtain the suspension that separates out to have sodium chloride particle;
[0023] The proportions of the above components are: 0.5-1.5 parts by mass of iron ion stabilizer, 0.5-1.5 parts by mass of clay stabilizer, 0.5-1.5 parts by mass of drainage aid, 0.5-1.5 parts by mass of high temperature Corrosion in...
Embodiment
[0034] This embodiment provides 1-4 examples of soluble salt particles self-turning temporary plugging diversion acidification fluid, which is prepared by the following steps:
[0035] At room temperature, add water first, then add iron ion stabilizer, clay stabilizer, drainage aid, high temperature corrosion inhibitor and stir, then add dispersant, suspending agent and sodium chloride in sequence, and stir for 3 to 10 minutes. When it is completely dissolved, measure concentrated hydrochloric acid and add it for 10-30 minutes while stirring to obtain a suspension with precipitated sodium chloride particles. Wherein, the amount of sodium chloride, concentrated hydrochloric acid and various additives is shown in Table 1 below.
[0036] Table 1 1 to 4 cases of sodium chloride, concentrated hydrochloric acid and the dosage of various additives
[0037] substance
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Abstract
The invention discloses a method for preparing a nano-micron autolysis temporary plugging diverter. The method comprises the following steps: at the room temperature, weighing a certain quantity of water, adding an iron ion stabilizer, a clay stabilizer, a cleanup additive and a high-temperature corrosion inhibitor into the water, performing stirring to obtain a mixed liquid I; continuously addinga dispersant into the mixed liquid I, performing stirring, then adding a suspending agent and sodium chloride, and performing stirring for 3-10 min to obtain a mixed liquid II; and weighing concentrated hydrochloric acid, adding the weighed concentrated hydrochloric acid into the mixed liquid II, and performing continuous stirring for 10-30 min to obtain a suspension out of which sodium chlorideparticles are separated. The formed diverter is a sodium chloride particulate substance with the grain size smaller than 3 [mu]m, and can deeply enter a reservoir to temporarily plug a high-permeability layer and seams. Along with ending of acidizing construction, sodium chloride particles which play a temporary plugging role are dissolved into a residual acid liquid or formation water for unplugging. The method has the characteristics that an organic high-molecular compound is not contained, gluing linkage or gel breaking is not needed, self-unplugging is realized, little formation damage iscaused and the method is simple and is low in cost.
Description
technical field [0001] The invention relates to the field of oil and gas field development, in particular to a preparation method of a temporary plugging diversion self-dissolving diversion agent, in particular to an autodissolvable temporary plugging diversion agent containing nano-micron sodium chloride particles. Background technique [0002] Acidizing and acid fracturing is one of the commonly used stimulation measures for low-permeability reservoirs in the exploration and development of oil and gas fields. Through the contact reaction between the acid liquid and the formation rock, acid corrosion holes are generated, which makes the formation oil and gas flow out more easily, and achieves the purpose of increasing production capacity. However, the acid liquid follows the principle of natural selection during acidification, that is, it preferentially enters the high-permeability area of the reservoir, and it is difficult to effectively transform the low-permeability of...
Claims
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