Plugging and unplugging effect evaluation method for plugging material
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A technology of plugging materials and evaluation methods, applied in the field of drilling plugging materials, can solve the problems of plugging cracks, large experimental errors, and single function, etc. effect of demand
Pending Publication Date: 2021-11-12
CHINA PETROCHEMICAL CORP +2
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[0005] The purpose of the present invention is to provide a method for evaluating the effect of plugging and plugging removal with plugging materials, so as to solve the problems of plugging cracks with plugging materials that generally exist in existing experimental devices such as complex operation, large experimental errors and single functions.
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Embodiment 1
[0058] see Figure 1-5 , in an embodiment of the present invention, a method for evaluating the effect of plugging and plugging removal with plugging materials, including a core column, liquid plugging materials, and a dynamic damage evaluation instrument, the steps are as follows,
[0059] S1: Prepare a plurality of core pillars with different fracture widths, the core pillars are made of stainless steel, and the fracture width is in the range of 0.05-8mm;
[0060] Among them, a plurality of core pillars with different fracture widths are prepared. The core pillars are prepared through the following sub-steps. Two symmetrical stainless steel half cylinders are prepared, and the diameter surfaces of the two half cylinders are wire cut to make fracture grooves, and the two half cylinders are The length of the crack grooves cut by one half cylinder is the same, and the cut two half cylinders are combined, wrapped with sealing tape, so that the two half cylinders fit closely, and...
Embodiment 2
[0099] A method for evaluating the effect of plugging and plugging removal with plugging materials, comprising a core column, liquid plugging materials, and a dynamic damage evaluation instrument, the steps are as follows,
[0100]S1: Prepare a plurality of core pillars with different fracture widths, the core pillars are made of stainless steel, and the fracture width is in the range of 0.05-8mm;
[0101] S2: Inject the liquid leakage plugging material into the fracture of one of the core columns, and perform curing under simulated formation temperature and pressure conditions, and obtain the core column after the liquid leakage plugging material is consolidated;
[0102] S3: Use a dynamic damage evaluation instrument to evaluate the plugging of the core column obtained in step S2. The dynamic damage evaluation instrument includes a connected wellbore simulation system, a core holder, and a base fluid collection device. The inlet end of the core holder is equipped with Pressu...
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Abstract
The invention discloses a plugging and unplugging effect evaluation method for a plugging material. The method comprises the steps of S1 preparing a plurality of core columns with different crack widths, the core columns are made of stainless steel, and the crack width is in a range of 0.05 to 8 mm; S2 injecting a liquid plugging material into the crack of one of the core columns, maintaining under the simulated formation temperature and pressure condition, and obtaining the core column solidified by the liquid plugging material after the maintenance is completed; S3 carrying out plugging evaluation on the core column prepared in the step S2 by adopting a dynamic damage evaluation instrument; S4 performing a dynamic acid dissolution experiment on the core column prepared in the step S2 to obtain the mass, the acid dissolution depth and the gas logging permeability of the core column after acid dissolution; and S5 carrying out a static acid dissolution experiment on the core column or the consolidation block of the liquid plugging material prepared in the step S2, and recording the acid dissolution soaking time and the mass of the core column or the consolidation block after acid dissolution. According to the invention, the plugging and unplugging effects of the plugging material can be evaluated with high precision.
Description
technical field [0001] The invention relates to the technical field of drilling plugging materials in the field of petroleum exploration, in particular to a method for evaluating the effects of plugging and removing plugging materials. Background technique [0002] Lost circulation refers to the phenomenon that various working fluids (including drilling fluid, cement slurry, completion fluid and other fluids, etc.) leak into the formation under the action of pressure difference during drilling, cementing, well completion and other downhole operations. The loss of drilling fluid into the formation leads to an increase in economic costs, and may also lead to some well control problems. The incidence of lost circulation in the world accounts for about 20% to 25% of the total number of wells. Therefore, lost circulation has always been a concern at home and abroad. [0003] For the problem of well leakage, experts at home and abroad have continuously explored the plugging materi...
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