CN105334295A - Clay stabilizer washing resistance evaluation device and method - Google Patents

Abstract

The invention discloses a clay stabilizer washing resistance evaluation device and method. The device is composed of a vacuum pump, a glass two-way piston, a vacuum meter, a safety bottle, a glass filter column, a filter membrane, a spring clamp, a glass sand core connector and a suction filter flask. The method adopting the device for evaluating clay stabilizer washing resistance comprises the steps that a to-be-tested sample to which a clay stabilizer is added is poured into the glass filter column, time t0 for filtering the to-be-tested sample in a suction mode from the volume V1 to the volume V2 is recorded, then clean water with the volume of V1-V2 is added again to carry out repeated testing, the number n of repetition times and the corresponding time tn are recorded, the suction filtration speed Mu0 of the to-be-tested sample and the suction filtration speed Mun of the to-be-tested sample after the clean water is added are calculated respectively, Mu0 is calculated according to 100%, the washing suction filtration speed specific value omega n of the clay stabilizer is calculated, and the higher the omega n is, the better the washing resistance of the clay stabilizer is. The evaluation device is simple in structure and low in cost; by the adoption of the device, the washing resistance of the clay stabilizer can be evaluated fast, and the measurement accuracy is higher.

Description

A kind of clay stabilizer wash durability evaluating apparatus and method

Technical field

The invention belongs to the Performance Evaluation Technique field of clay stabilizer in oil gas field production, be specifically related to a kind of evaluating apparatus and method of clay stabilizer wash durability.

Background technology

Clay mineral is extensively present in oil reservoir, and in oil-field flooding, acid fracturing process, clay mineral meets water generation hydration swelling, dispersion and migration, very easily blocks oil reservoir path, destroys stratum, causes permeability plugging, have a strong impact on the production efficiency of oil.Prevent the common method of reservoir injury from being the clay stabilizer using this stratum applicable targetedly, effectively control hydration swelling and the dispersion migration of clay mineral.

Clay stabilizer is a kind of common oilfield chemistry reagent, and it is of a great variety, therefore, evaluates the key factor that clay stabilizer performance is its application.Wherein the wash durability of clay stabilizer is extremely important to its rig-site utilization, if clay stabilizer wash durability is poor, injects stratum, wash away the swollen deleterious of rear defence through water, clay mineral grain expands, and causes result of use not good.

At present, the evaluation method of clay stabilizer wash durability has three kinds: a kind of method is in graduated cylinder, puts into the bentonitic clay of certain mass respectively, and adds clear water, the clay stabilizer of certain volume respectively, fully shake up, at room temperature leave standstill 12 hours, read bentonite inflated volume, and do data record, then the liquid that graduated cylinder is clarified is poured out above, add the clear water of equivalent, every 12 hours repeat once, in the expansivity 100% of clear water; Another kind method is in centrifuge tube, puts into the bentonitic clay of certain mass respectively, and adds clear water, the clay stabilizer of certain volume respectively, fully shake up, at room temperature leave standstill 12 hours, fully shake up in rear loading hydro-extractor, centrifuging 15min under rotating speed is 1500r/min, read bentonite inflated after volume, and do data record, then pour out the liquid that centrifuge tube is clarified above, add the clear water of equivalent, every 12 hours repeat once, in the expansivity 100% of clear water; The third method evaluates the long-lasting of clay stabilizer by rock core flowing experiment, if clay stabilizer wash durability is poor, inject stratum and washed away rear suppression clay swelling decreased effectiveness by liquid, the injury rate that formation causes increases.

The water resistance evaluation method measurement result poor repeatability of the first clay stabilizer above-mentioned, measuring error is large, and minute is longer, although second method accuracy is higher, but minute is also longer, the third method accuracy is also higher, but minute is long and to measure core flow test instrument used expensive.

Summary of the invention

Technical matters to be solved by this invention is to overcome existing determinator and method exists shortcoming, there is provided that a kind of structure is simple, cost is low, easy-operating clay stabilizer wash durability evaluating apparatus, and adopt the method for this device Fast Evaluation clay stabilizer wash durability.

Solving the problems of the technologies described above adopted technical scheme is: on bottle,suction, be provided with glass core joint, glass core joint is provided with filter membrane, filter membrane is arranged the graduated glass filtration post of processing, the bottom outer rim of glass filtration post is processed with base, the base spring clamp of glass core joint and filter membrane, glass filtration post grips, the bleeding point of glass core joint is connected with the import a of safety flack by rubber tube, and the outlet b of safety flack is connected with vacuum pump by rubber tube.

The present invention arranges vacuum meter between the preferred bleeding point at glass core joint and the import of safety flack further, arranges an outlet c on safety flack more simultaneously, outlet is arranged the glass two be connected with the external world and leads to piston.

The diameter of above-mentioned filter membrane is not less than the core diameter of glass core joint, and the internal diameter of glass filtration post is less than the diameter of filter membrane.

The method adopting said apparatus to evaluate clay stabilizer wash durability is made up of following step:

1, in clay stabilizer aqueous solution, add bentonitic clay, stir, leave standstill 2 hours, make its abundant hydration swelling, obtain testing sample.

2, pour into after testing sample being stirred in the graduated glass filtration post of processing, open vacuum pump, with stopwatch record testing sample by volume V ₁suction filtration is to volume V ₂time t ₀, then in glass filtration post, add (V ₁-V ₂) clear water carry out repeating experiment, record multiplicity n and corresponding time t _n, wherein n>0, calculates the washing suction filtration speed μ of clay stabilizer according to following formula _n:

${\mathrm{\μ}}_n=\frac{V_2-V_1}{t_n}$

In the washing suction filtration speed of clay stabilizer for 100%, calculate the washing suction filtration rate ratio ω of clay stabilizer according to following formula _n:

${\mathrm{\ω}}_n=\frac{{\mathrm{\μ}}_n}{{\mathrm{\μ}}_0}$

μ in formula ₀for not adding the suction filtration speed of clay stabilizer before clear water, μ _nfor adding the suction filtration speed of clay stabilizer n-th washing after clear water; The washing suction filtration rate ratio ω of clay stabilizer _nhigher, illustrate that clay stabilizer wash durability is better.

Beneficial effect of the present invention is as follows:

Clay stabilizer wash durability evaluating apparatus structure of the present invention is simple, with low cost, and it is simple to operate, adopt this device can Fast Evaluation clay stabilizer wash durability, minute short (generally only needing 12 hours), and accuracy of measurement is higher, basically identical with rock core flowing experiment measurement result.

Accompanying drawing explanation

Fig. 1 is the structural representation of clay stabilizer wash durability evaluating apparatus of the present invention.

Fig. 2 is the long-lasting result figure of clay stabilizer adopting rock core flowing experiment to measure.

Embodiment

Below in conjunction with drawings and Examples, the present invention is described in more detail, but protection scope of the present invention is not limited only to these embodiments.

Embodiment 1

As shown in Figure 1, clay stabilizer wash durability evaluating apparatus of the present invention leads to piston 2 by vacuum pump 1, glass two, vacuum meter 3, safety flack 4, glass filtration post 5 with a scale, filter membrane 6, spring clamp 7, glass core joint 8, bottle,suction 9 form.

Bottle,suction 9 is set with glass core joint 8, and the end opening of glass core joint 8 is beam ground, matches with the bottleneck of bottle,suction 9; The core diameter of glass core joint 8 is 6cm.Glass core joint 8 is placed with the filter membrane 6 that diameter is 6cm, aperture is 0.45 μm, filter membrane 6 is placed the graduated glass filtration post 5 of processing, the precision of scale is 0.5mL.Glass filtration post 5 is hollow cylinder, and cylinder inner diameter is 2cm.The bottom outer rim of glass filtration post 5 is processed with annular base, and the external diameter of base is 6cm.Glass filtration post 5 is for splendid attire testing sample and measure the volume change of testing sample.The base spring clamp 7 of glass core joint 8 and filter membrane 6, glass filtration post 5 grips.The bleeding point of glass core joint 8 is connected with the import a of safety flack 4 by rubber tube, and safety flack 4, for regulating pressure, prevents suck-back.The outlet b of safety flack 4 is connected with vacuum pump 1 by rubber tube, and vacuum pump 1 is for vacuumizing bottle,suction 9.Due in the process that vacuumizes at vacuum pump 1, vacuum tightness in bottle,suction 9 can reduce a little, in order to reduce measuring error as far as possible, between safety flack 4 and the bleeding point of glass core joint 8, vacuum meter 3 is installed, on safety flack 4, process an outlet c simultaneously, outlet c installs the glass two be connected with the external world and leads to piston 2, lead to the piston on piston 2 by rotary glass two, make the constant pressure of vacuum meter 3 a fixing value, thus ensure the constant pressure in bottle,suction 9.

Adopt the method for said apparatus evaluation clay stabilizer wash durability as follows:

1, in clay stabilizer aqueous solution, add bentonitic clay, stir, leave standstill 2 hours, make its abundant hydration swelling, obtain testing sample.

2, pour in the graduated glass filtration post 5 of processing after testing sample being stirred fast, open vacuum pump 1, lead to the piston on piston 2 by rotary glass two, make the constant pressure of vacuum meter 3 under-0.08MPa, with testing sample in stopwatch record glass filtration post 5 by volume V ₁suction filtration is to V ₂time t ₀, then in glass filtration post 5 with a scale, add (V ₁-V ₂) clear water of volume carries out repeating experiment, record multiplicity n and corresponding time t _n, wherein n>0, calculates the washing suction filtration speed μ of clay stabilizer according to following formula _n:

${\mathrm{\μ}}_n=\frac{V_2-V_1}{t_n}$

V in formula ₁, V ₂unit be cm ³; t _nunit be second;

In the washing suction filtration speed of clay stabilizer for 100%, calculate the washing suction filtration rate ratio ω of clay stabilizer according to following formula _n:

${\mathrm{\ω}}_n=\frac{{\mathrm{\μ}}_n}{{\mathrm{\μ}}_0}$

μ in formula ₀for not adding the suction filtration speed of clay stabilizer before clear water, μ _nfor adding the suction filtration speed of clay stabilizer n-th washing after clear water.The washing suction filtration rate ratio ω of clay stabilizer _nhigher, illustrate that clay stabilizer wash durability is better.

In order to prove beneficial effect of the present invention, inventor gets KCl aqueous solution, 40mL massfraction TR-2 clay stabilizer (Tuo Rong Chemical Industry Science Co., Ltd provides by the Xi'an) aqueous solution that is 0.5%, 40mL massfraction LY2560 clay stabilizer (Lu Yue Chemical Co., Ltd. provides by the Shandong) aqueous solution that is 0.5% that 40mL massfraction is 0.5% respectively, and respectively add 0.8g bentonitic clay wherein, then said apparatus and method is adopted, measure the wash durability of clay stabilizer respectively, mensuration the results are shown in Table 1.

Table 1 clay stabilizer wash durability measurement result

For different clay stabilizer, its water-fastness ability is different.In the washing suction filtration speed of clay stabilizer for 100%, the washing suction filtration rate ratio ω of clay stabilizer _nhigher, illustrate that clay stabilizer wash durability is better.The measurement result of table 1 shows, the wash durability of TR-2 clay stabilizer is best, is secondly LY2560 clay stabilizer, and the water-fastness ability of KCl is the poorest.

Above three kinds of clay stabilizers evaluate by rock core flowing experiment that it is long-lasting, and result as shown in Figure 2.Rock core flowing experiment result shows, long-lasting it is preferred that TR-2 clay stabilizer, and the artificial rock core water fire extinguishing after metaideophone tap water after its process is still below 20%; Next is LY2560 clay stabilizer; And KCl's is long-lasting the poorest.Rock core flowing experiment measurement result is consistent with measurement result of the present invention.

Claims (4)

1. a clay stabilizer wash durability evaluating apparatus, it is characterized in that: on bottle,suction (9), be provided with glass core joint (8), glass core joint (8) is provided with filter membrane (6), filter membrane (6) is arranged the graduated glass filtration post (5) of processing, the bottom outer rim of glass filtration post (5) is processed with base, glass core joint (8) and filter membrane (6), the base spring clamp (7) of glass filtration post (5) grips, the bleeding point of glass core joint (8) is connected by the import (a) of rubber tube with safety flack (4), the outlet (b) of safety flack (4) is connected with vacuum pump (1) by rubber tube.

2. clay stabilizer wash durability evaluating apparatus according to claim 1, it is characterized in that: between the bleeding point of described glass core joint (8) and the import of safety flack (4), be provided with vacuum meter (3), safety flack (4) is also provided with one and leads to piston (2) and the extraneous outlet (c) be connected by glass two.

3. clay stabilizer wash durability evaluating apparatus according to claim 1 and 2, it is characterized in that: the diameter of described filter membrane (6) is not less than the core diameter of glass core joint (8), and the internal diameter of glass filtration post (5) is less than the diameter of filter membrane (6).

4. adopt device described in claim 1 to evaluate a method for clay stabilizer wash durability, it is characterized in that it is made up of following step:

(1) in clay stabilizer aqueous solution, add bentonitic clay, stir, leave standstill 2 hours, make its abundant hydration swelling, obtain testing sample;

(2) pour into after testing sample being stirred in the graduated glass filtration post (5) of processing, open vacuum pump (1), with stopwatch record testing sample by volume V ₁suction filtration is to volume V ₂time t ₀, then in glass filtration post (5), add (V ₁-V ₂) clear water carry out repeating experiment, record multiplicity n and corresponding time t _n, wherein n>0, calculates the washing suction filtration speed μ of clay stabilizer according to following formula _n:

${\mathrm{\μ}}_n=\frac{V_2-V_1}{t_n}$

In the washing suction filtration speed of clay stabilizer for 100%, calculate the washing suction filtration rate ratio ω of clay stabilizer according to following formula _n:

${\mathrm{\ω}}_n=\frac{{\mathrm{\μ}}_n}{{\mathrm{\μ}}_0}$

μ in formula ₀for not adding the suction filtration speed of clay stabilizer before clear water, μ _nfor adding the suction filtration speed of clay stabilizer n-th washing after clear water; The washing suction filtration rate ratio ω of clay stabilizer _nhigher, illustrate that clay stabilizer wash durability is better.