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Methods for high solids fluids in oilfield applications

A fluid, first fluid technology, applied in the fields of production of fluids, chemical instruments and methods, earth-moving drilling and mining, etc.

Inactive Publication Date: 2016-02-03
PRAD RES & DEV LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These advantages are again lost by using PADs that require fluid additives

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  • Methods for high solids fluids in oilfield applications
  • Methods for high solids fluids in oilfield applications
  • Methods for high solids fluids in oilfield applications

Examples

Experimental program
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Effect test

example 1

[0067] The following is an example to help illustrate the use of such calculations. Assume the following input parameters:

[0068]

[0069] Using these parameters, W f / L*E' / σ=8.33e-3, and it can be determined that p / σ is 1.053. This produces a net pressure (p-σ) of 212 psi. This net pressure is of the same order of magnitude as typical hydraulic fracturing pressures. This means that for this particle size and for a fracture of sufficient length to have developed over 50ft, the fracture width is sufficient to accept the particle without additional pressure.

[0070] For fractures initiated from a wellbore, the pressurization of the wellbore needs to be considered. Figure 8 Displays the geometry of the considered fracture. To evaluate the fracture opening at the fracture entrance, we make the pressurized well approximately represent a pressurized fracture segment of length equal to the diameter of the wellbore, as Figure 9 shown in . Using this approximation, the w...

example 2

[0076] The following is a second embodiment, all parameters are the same as in the previous embodiment, and r w = 0.5ft. We can calculate W f / r w *E' / σ=0.833, and p / σ was determined to be 1.64. This produces a net pressure of 2560psi. This pressure is quite high, but not unrealistic to initiate fracture for the first time.

[0077] In order to avoid high fracture pressures, HSCF with small particles can be used. Using the above equation, the expected pressure can be estimated. Particle size can be optimized so that acceptable pressures can be achieved.

example 3

[0079] Using this computational approach, we have evaluated fracture initiation and propagation stresses under several different scenarios.

[0080] Formation depth: shallow wells equivalent to 5000psi closure stress and deep wells equivalent to 10000psi closure stress.

[0081] Formation hardness: soft rock with Young's modulus of 0.5Mpsi, conventional rock with 1Mpsi and hard rock with 5Mpsi.

[0082] Maximum particle sizes used in the manufacture of HSCFPAD: 20, 40, 100 and 400 mesh.

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Abstract

A method for a wellbore is disclosed, comprising: providing a first fluid comprising at least a first type of particulate material having a first average particle size and a second type of particulate material having a second average particle size, wherein the first average particle size is smaller than the second average particle size; providing a second fluid comprising at least a third type of particulate material having a third average particle size and a fourth type of particulate material having a fourth average particle size, wherein the third average particle size is smaller than a fourth average particle size; and introducing the first fluid into the wellbore followed by introducing the second fluid into the wellbore, wherein the third average particle size is substantially equal to the second average particle size.

Description

technical field [0001] The present invention relates to methods for treating earth formations. More specifically, the present invention relates to methods for optimizing the content of particulate material in a fluid. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. [0003] Hydrocarbons (petroleum, condensate and gas) are generally produced from wells drilled into the formations containing them. For various reasons (such as the inherent low permeability of the reservoir or formation failure caused by drilling and completion), the hydrocarbon content flowing into the well is too low. In this case, the well is "stimulated" using, for example, hydraulic fracturing, chemical (usually acid) stimulation, or a combination of the two (known as acid fracturing or frac-acidizing). [0004] In hydraulic and acid fracturing, a first viscous fluid called pad fluid is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/13
CPCC09K8/70C09K8/74C09K8/80E21B43/26E21B43/267C09K8/62
Inventor 陈一岩顾洪仁翁晓伟皮特·J·弗图斯莫汉·K·R·番加
Owner PRAD RES & DEV LTD