Summary of the invention
The object of this invention is to provide a kind of method, the method can carry out effective evaluation to interleaving agent, and evaluation result can directly apply to scene.
To achieve these goals, the invention provides a kind of human-cutting high slope interleaving agent evaluation method, the method comprises: the physical characteristic determining described interleaving agent, and this physical characteristic comprises and of the fracturing fluid compatibility; When determining described interleaving agent and described of the fracturing fluid compatibility is good, detect the floating/subsidence velocity of described interleaving agent in described fracturing fluid; Determine that intensity is blocked on the stratum of described interleaving agent; And output evaluation result.
Further, the described floating/subsidence velocity of described interleaving agent is average speed, wherein, calculates this average speed by the particle recording described interleaving agent float/sink in described fracturing fluid time of a segment distance.
Further, describedly determine that the stratum of described interleaving agent is blocked intensity and comprised: make described fracturing fluid flow through the interlayer be made up of described interleaving agent; And determine that intensity δ is blocked on the stratum of described interleaving agent by following equation
2:
Wherein, δ
1intensity is blocked, V for interleaving agent described under experiment condition
1for of the fracturing fluid flow velocity described under experiment condition, μ
1for fracturing fluid described under experiment condition flows through the viscosity after described interleaving agent, V
2for of the fracturing fluid rate of flow of fluid described under formation condition, and μ
2for formation condition fracturing liquid flows through the viscosity after described interleaving agent.
Further, the method also comprises: detect described fracturing fluid and flow through the pressure reduction before and after described interlayer and the thickness measuring described interlayer; And block intensity δ by described interleaving agent under following equation determination experiment condition
1:
δ
1=ΔP/L,
Wherein, Δ P is the pressure reduction that described fracturing fluid flows through before and after described interlayer, and L is the thickness of described interlayer.
Further, described formation condition is simulated by adding gentle pressurization to described experiment condition.
Further, the physical characteristic of described interleaving agent also comprises following one at least: the order number of described interleaving agent, bulk density and real density.
Further, described fracturing fluid is the base fluid by melon glue and water configuration.
Further, described base fluid concentration is following one at least: 0.1%, 0.15%, 0.2%, 0.25% and 0.3%.
Pass through technique scheme, can comprehensively carry out physical characteristic evaluation, floating/subsidence velocity evaluation to interleaving agent to be evaluated and block intensity evaluation, thus effective evaluation is carried out to interleaving agent, and evaluation method considers the applied environment on stratum, the result therefore evaluated can directly apply to scene.
Other features and advantages of the present invention are described in detail in detailed description of the invention part subsequently.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, detailed description of the invention described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
Fig. 1 is a kind of human-cutting high slope interleaving agent evaluation method flow chart according to embodiment of the present invention.As shown in Figure 1, the human-cutting high slope interleaving agent evaluation method that embodiment of the present invention provides, comprising: S101, determines the physical characteristic of described interleaving agent, and this physical characteristic comprises and of the fracturing fluid compatibility; S102, when determining described interleaving agent and described of the fracturing fluid compatibility is good, detects the floating/subsidence velocity of described interleaving agent in described fracturing fluid; S103, determines that intensity is blocked on the stratum of described interleaving agent; And S104, export evaluation result.Pass through technique scheme, can comprehensively carry out physical characteristic evaluation, floating/subsidence velocity evaluation to interleaving agent to be evaluated and block intensity evaluation, thus effective evaluation is carried out to interleaving agent, and evaluation method considers the applied environment (temperature and pressure) on stratum, and the result therefore evaluated can directly apply to scene.
In embodiments, can for the base fluid by melon glue and water configuration according to the fracturing fluid used in evaluation method of the present invention.Such as, melon matrix liquid concentration can be following one at least: 0.1%, 0.15%, 0.2%, 0.25% and 0.3%.By detecting the floating/subsidence velocity of interleaving agent to be measured in the melon matrix liquid of variable concentrations, combination property and the applicability of interleaving agent can be checked.
In evaluation procedure is carried out, after certain density interleaving agent adds base fluid, the most particle of interleaving agent with fast speed deposition or can float up to container bottom or liquid level.And may there are differences due to the particle diameter of often kind of interleaving agent, cause sinking between the particle of single interleaving agent or ascent rate phase missionary society very large.And likely there will be to unite between particle sinking or rising phenomenon, thus accelerate sinking or the ascent rate of interleaving agent.These situations bring difficulty to the measurement of interleaving agent float-and-sink rate.Therefore, in a preferred embodiment, the floating/subsidence velocity of interleaving agent can be average speed, and wherein, the time of the segment distance that can be floated/sink in described fracturing fluid by the particle recording described interleaving agent calculates this average speed.By recording the total time spent by most of particle moving certain distance, ask for average speed, though this average speed accurately can not react sedimentation or the floating rule of interleaving agent, but can as a reference, can from sinking or the ascent rate macroscopically characterizing different interleaving agent.
Below by a concrete embodiment, principle of the present invention is further illustrated.
In embodiments, utilize human-cutting high slope interleaving agent evaluation method provided by the invention to evaluate, wherein, in floating agent following four kinds of interleaving agents: S1 is the floating agent of certain field produces, S2 is the hollow glass micropearl that certain company produces; In sinking agent: X1 is 80/100 order haydite, X2 is 100/120 order haydite.
First, the base fluid of 0.1%, 0.15%, 0.2%, 0.25%, 0.3% can be respectively as fracturing fluid with melon glue and clear water configuration concentration.Capillary viscosimeter can be used to measure the viscosity of each melon gum concentration base fluid.The viscosity that the melon matrix liquid of variable concentrations is corresponding is as shown in table 1.
Table 1
Can physical method be utilized, measure the physical characteristic of above-mentioned interleaving agent by experiment, namely bulk density, real density and they under room temperature and formation temperature conditions with of the fracturing fluid compatibility, measurement result is as shown in table 2.
Table 2
Title |
Order number |
Bulk density g/cm
3 |
Real density g/cm
3 |
With fracturing fluid compatibility |
S1 |
5~180 |
0.70 |
0.90 |
Good |
S2 |
16~50 |
0.52 |
0.83 |
Good |
X1 |
80/100 |
1.75 |
2.65 |
Good |
X2 |
100/120 |
1.85 |
2.81 |
Good |
For the interleaving agent good with of the fracturing fluid compatibility, can continue to detect its floating/subsidence velocity in fracturing fluid.For then can not eliminating or be evaluated as and can not select with the interleaving agent of the good compatibility of fracturing fluid.Detect the floating/subsidence velocity of interleaving agent in fracturing fluid can mode by experiment carry out.Experiment can select the instrument commonly used, such as, and electronic balance, glass bar, magnetic stirring apparatus, beaker, graduated cylinder, stopwatch etc.Can detect in the following way: the heavy formula/floating diversion agent (i.e. interleaving agent) adding finite concentration (sand than) inside the graduated cylinder filling melon matrix liquid, after stirring with glass bar, with stopwatch record interleaving agent sink/floating certain distance needed for time, computes convergence/ascent rate.Can change interleaving agent concentration and repeat said process, and the concentration changing melon matrix liquid repeats said process.Utilize the data recorded can draw floating/subsidence velocity and melon gum concentration and interleaving agent concentration relationship curve as shown in Figure 2.
As can be seen from Figure 2, interleaving agent sinking/ascent rate all reduces along with the increase of melon matrix liquid concentration, and wherein, the subsidence velocity of sinking agent X1 is better than X2, and the ascent rate of floating agent S1 is better than S2.Illustrate below how to determine different interleaving agent block intensity.
Fig. 3 is the apparatus structure schematic diagram implementing human-cutting high slope interleaving agent evaluation method provided by the invention.Fig. 3 shows and carries out detecting the core flow test instrument that can adopt to the intensity of blocking of interleaving agent, can comprise: constant flow pump 1, intermediate receptacle 2, pressure meter 3, confined pressure pump 4, metering device 5, confined pressure pipe 8 and two ends are provided with the hollow cylinder container 6 of steel column plug 7.Said elements is connected by pipeline, and pipeline is provided with valve.Wherein place interleaving agent to be measured in hollow cylinder container 6, this hollow cylinder container 6 can be provided with filter screen with the contact surface of steel column plug 7.Can the state of analog isolation agent by the duty controlling confined pressure pump 4, such as, correspond to the natural packing state of interleaving agent when not adding confined pressure, when applying confined pressure, in hollow cylindrical chamber 6, interleaving agent rock core length L can reduce.Can be measured pipeline, steel column and the filter screen pressure reduction under same traffic condition by pressure meter 3.
In embodiments, what the device shown in Fig. 3 can be utilized to detect four kinds of interleaving agents blocks intensity, flows through the pressure reduction before and after interleaving agent interlayer and the thickness measuring described interlayer by detecting described fracturing fluid; And under determining experiment condition by following equation (1) described interleaving agent block intensity δ
1:
δ
1=ΔP/L (1)
Wherein, Δ P is the pressure reduction that described fracturing fluid flows through before and after described interlayer, and L is the thickness (or segment length) of described interlayer.Intensity that what four kinds of interleaving agents recorded under experimental conditions block is as shown in table 3.
Table 3
Wherein, independent test line and filter screen additional pressure drop, can obtain additional pressure drop, such as, and 1.2KPa.What calculate at table 3 blocks in intensity, is deducted by the Pressure Drop that pipeline and filter screen add.
According to Darcy's law (2):
Wherein, Q is the flow under given pressure reduction, and L is experiment interleaving agent rock core length, and μ is fracturing fluid viscosity, and Δ p is experiment pressure reduction, and A is interleaving agent rock core cross-sectional area.
Record by experiment above and blocked intensity under experiment condition.Can be converted to and block intensity under formation condition the intensity of blocking of interleaving agent under experiment condition.Utilize Darcy formula, suppose that the pressure drop that in stratum, 1m interleaving agent produces is δ 2, blocking intensity under experiment condition is δ 1, then can obtain following equation (3):
Wherein, δ
1intensity is blocked, V for interleaving agent under experiment condition
1for the flow velocity of experiment condition fracturing liquid, μ
1for experiment condition fracturing liquid flows through the viscosity after interleaving agent, V
2for the rate of flow of fluid of formation condition fracturing liquid, and μ
2for formation condition fracturing liquid flows through the viscosity after interleaving agent.In embodiments, can be simulated by heat to experiment condition (such as heating hollow cylinder container 6) and pressurize (such as adding confined pressure to hollow cylinder container 6) and obtain formation condition.
Herein, formation fracture pattern analog result carries out the hypothesis that is similar to.According to professional software (the such as Fracpro-PT software) analog result to Different Strata condition, crack can be reduced to major semiaxis is 42m, semi-minor axis is about the model of ellipse of 20m, and fluid is equal along crack periphery seepage velocity in hypothesis seam, the on-the-spot fluid efficiency provided finally is provided, the seepage velocity of fluid in stratum can be estimated.
Based on the calculating of this model hypothesis, when infusion discharge capacity is 3m
3during/min, edge of crack liquid flow velocity V in stratum
2=98.3cm/min, flow velocity V during experiment test
1=1.132cm/min, experiment condition fracturing liquid flows through the viscosity, mu after interleaving agent
1=3.04mPas(can be taken as 3mPas), formation condition fracturing liquid can be obtained be about 2mPas by adding gentle pressurization to experiment condition by the filtrate viscosity after interleaving agent, so block multiple intensity and ground blocking intensity in stratum to be about 52 times, what can obtain interleaving agent under formation condition accordingly blocks intensity, in table 4.
Table 4
Integrated comparative settling rate and to block intensity known, floating agent S1 and sinking agent X2 successful are better than other two kinds of interleaving agents (block intensity large, isolation effect is good, and interleaving agent is more excellent), thus by evaluating the interleaving agent obtaining applicable onsite application.Then, further combined with the Fracturing design software analog result of specialty, the consumption of interleaving agent can be calculated.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present invention; multiple simple variant can be carried out to technical scheme of the present invention; such as, interleaving agent interlayer or interleaving agent rock core, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each the concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, can be combined by any suitable mode.In order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible combination.
In addition, also can be combined between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.