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Pumping device and working method for intermediate displacement fluid in pulse sand fracturing

A pulse sand fracturing and displacement fluid technology, which is applied in the field of oil and gas field development and research, can solve the problems of inability to alternately inject intermediate displacement fluid and sand-carrying fluid, failure to form proppant slugs, and no proppant slug visualization device, etc. problems, to achieve the effect of improving the conductivity of fractures, preventing mutual backflow, and improving operating efficiency

Active Publication Date: 2018-02-27
DONGYING DAHAIRUN PETROLEUM TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the ideal proppant clusters formed by the pulsed injection of pulsed sand fracturing are described qualitatively, and there is no research on the pumping of intermediate displacement fluids.
In 2014, Wu Shunlin and others proposed a new pulse sand fracturing method to achieve high conductivity of fractures in "A New Method of Pulse Sand Fracturing to Realize High Conductivity of Fractures", and verified the uneven filling At the same time, the stability and integrity of the proppant slug have been explored, but there is no research on the influence of the intermediate displacement fluid on the uneven filling layer and the pumping of the intermediate displacement fluid. fully explore the process
The domestic patent document "Fluid Alternate Continuous Pumping Device for Hydraulic Fracturing Simulation Experiment" (CN203515536U) proposes an experimental device for pumping two kinds of experimental fluids. The established procedure adjusts the sand ratio of the sand-carrying fluid and adds other additives
In addition, only the wellhead device is designed at the end, and there is no visual device for the proppant slug, and the effective recycling of the liquid cannot be achieved.
The domestic patent document "Sand-carrying fluid pump injection device for hydraulic fracturing simulation experiment" (CN204371292U) has designed a pump injection simulation device for sand-carrying fluid, but it cannot make the alternate injection of intermediate displacement fluid and sand-carrying fluid, and also The corresponding proppant slug cannot be formed, and the suitable liquid flow rate, pumping time and sand-carrying liquid concentration cannot be optimized

Method used

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  • Pumping device and working method for intermediate displacement fluid in pulse sand fracturing
  • Pumping device and working method for intermediate displacement fluid in pulse sand fracturing
  • Pumping device and working method for intermediate displacement fluid in pulse sand fracturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] like figure 1 as shown,

[0042] An intermediate displacement fluid pumping device for pulse sand fracturing, including an intermediate displacement fluid pump unit, a sand mixing vehicle pump unit, a liquid storage tank, a computer control system, a simulated wellbore and a visible flat plate fracture device, the sand mixing vehicle pump unit and The outlet of the intermediate displacement pump unit is connected to the simulated wellbore, the inlets of the sand mixing truck pump unit and the intermediate displacement pump unit are respectively connected to the liquid storage tank, the simulated wellbore is connected to the visible flat plate fracture device, and the computer control system is connected to the sand mixing unit respectively. The truck pump unit and the intermediate displacement pump unit are connected; the sand mixer pump unit is used to pump the sand-carrying fluid for fracturing, the intermediate displacement pump unit is used to pump the intermediate ...

Embodiment 2

[0050] A method utilizing the device described in embodiment 1, comprising the steps of:

[0051] (1) Prepare experimental materials such as proppant, fiber, and other fracturing fluid additives required by the experimental plan; connect the pumping device and test the tightness of the entire device;

[0052] (2) In the liquid storage tank, configure the guar gum fracturing fluid base fluid as required, and use the agitator above the liquid storage tank to fully stir the fracturing fluid base fluid; avoid fish eyes;

[0053] (3) Set the pumping control program in the computer control system. The set control parameters include the pulse time and pulse frequency of the intermediate displacement fluid and the sand-carrying fluid, and the respective pumping flow rates of the sand mixer pump unit and the intermediate displacement fluid pump unit. ; Rotate the inner casing of the simulated wellbore so that the column of perforations with 8 perforations is aligned with the gap of the...

Embodiment 3

[0060] For the pumping device for displacing fluid in the middle of pulse sand fracturing as described in embodiment 1, and the working method described in embodiment 2, the specific experimental method of the device is:

[0061] (1) Experimental displacement

[0062] In the experiment, a small-displacement pump was used to fill the sand-carrying fluid and the intermediate displacement fluid. The pumping flow rate of both was set to 50 L / min. At the beginning, no closing pressure was applied to the visible plate fracture device, and the fracture width was set to 8 mm.

[0063] (2) Experimental proppant particle size

[0064] The commonly used proppant particle size is selected as the proppant used in this experiment. In this experiment, 20 / 40 mesh ceramsite was finally selected as the experimental proppant. Its main parameters are shown in Table 1 below:

[0065] Table 1 Routine performance tests of proppants

[0066]

[0067] (3) Viscosity of fracturing fluid

[0068]...

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Abstract

The invention relates to a pump casting device of impulse sand fracturing intermediate displacement fluid and a working method. The pump casting device of the impulse sand fracturing intermediate displacement fluid comprises an intermediate displacement fluid pump assembly, a fracturing blender truck pump assembly, a fluid storage tank, a computerized control system, a simulation shaft and a visual planar slotted device, wherein the outlet of the fracturing blender truck pump assembly and the outlet of the intermediate displacement fluid pump assembly are jointly connected into the simulation shaft; the inlet of the fracturing blender truck pump assembly and the inlet of the intermediate displacement fluid pump assembly are respectively connected with the fluid storage tank; the simulation shaft is connected with the visual planar slotted device; the computerized control system is respectively connected with the fracturing blender truck pump assembly and the intermediate displacement fluid pump assembly; sand-carrying fluid and intermediate displacement fluid are alternately pumped in an impulse mode through the computerized control system; and finally, a certain propping agent slug is formed to guarantee flow guiding ability of fractures. Through the visual planar slotted device, formation and distribution of the propping agent slug can be observed from the outside, fracture widths can be adjusted, closing pressures can be provided, forms and stability of the propping agent slug can be observed under different closing pressures, and experiment efficiency is high.

Description

technical field [0001] The invention relates to a pumping device and a working method for an intermediate displacement fluid in pulse sand fracturing, and belongs to the technical field of oil and gas field development and research. Background technique [0002] Pulse sand fracturing is to pump a section of proppant into a section of proppant in a pulse mode through a special sand mixing vehicle during the sand injection fracturing process, and then pump a section of pure liquid in a pulse mode to perform repeated alternating cycles of sand injection fracturing. The sum of proppant pulse time and pure liquid pulse time is one pulse cycle. [0003] The injection of pulse sand fracturing pre-fluid is consistent with the conventional fracturing process, the main difference is that the proppant is injected in the form of pulse slug in the sand-carrying fluid stage, one stage of proppant and one stage of intermediate displacement fluid are carried out alternately, and the concent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26
Inventor 张炜李龙斌于海洋
Owner DONGYING DAHAIRUN PETROLEUM TECH DEV CO LTD