CN108505967A - Experimental provision is temporarily blocked up in a kind of oil/gas well eyelet and crack - Google Patents

Abstract

The invention discloses an oil and gas well hole and fracture temporary plugging experiment device, which comprises a transparent wellbore and a funnel installed on the top of the wellbore. A number of round holes and rectangular holes are set in different positions on the wellbore, and a flow hole is directly installed at each round hole. For the outlet pipe, first install a flat fracture device at each rectangular hole, and then install an outlet pipe at the end of the flat fracture device. Each outlet pipe and flat fracture device are made of transparent materials, and a water injection port is also set on the upper part of the wellbore. The invention can be used for the research of the temporary plugging mechanism of the temporary plugging agent, the evaluation of the temporary plugging effect, and the guidance of the design of the construction parameters of the temporary plugging acidification fracturing, and has positive significance for improving the success rate of the temporary plugging transformation.

Description

An experimental device for temporary plugging of holes and fractures in oil and gas wells

technical field

The invention relates to the field of oil and gas field development, in particular to an experimental device for temporarily plugging holes and fractures of oil and gas wells.

Background technique

With the continuous development of high water cut, low permeability, and complex heterogeneous oil and gas fields, higher and higher technical requirements are put forward for oil reservoir fracturing and acid fracturing technology, and fracturing and acid fracturing operations are becoming more and more difficult. In formations with large differences in permeability, the purpose of uniform reconstruction can be achieved by using temporary plugging technology. The temporary plugging technology is to pump a temporary plugging agent into the target layer under certain conditions, and use the difference in permeability in the layer to block the high-permeability layer and let the injected fluid flow to the low-permeability layer, so as to change the flow direction of the original liquid and improve the The purpose of the low-permeability section. Temporary plugging agent is a treatment agent widely used in oilfield production, and has been maturely used in on-site construction operations, including: drilling, stimulation, cementing, workover, well washing, etc. Currently commonly used temporary plugging agents mainly include organic jelly temporary plugging agents, chemical particle temporary plugging agents, and fiber temporary plugging agents. Organic gel temporary plugging agents are mainly used to plug micron-scale fractures; chemical particle temporary plugging agents have better temporary plugging effects and a wide range of applications; degradable fiber temporary plugging agents are widely used in reservoirs with strong heterogeneity and natural fractures. Better temporary blocking effect.

Although various types of temporary plugging agents have been widely used in oilfields, there are still unclear temporary plugging mechanism of temporary plugging agents, imperfect evaluation methods of temporary plugging effects, and design of construction parameters for temporary plugging fracturing and temporary plugging acid fracturing. The method is not scientific enough and so on.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned problems, and provide an experimental device for temporary plugging of oil and gas wells and fractures, which can be used for the study of temporary plugging mechanism of temporary plugging agent, evaluation of temporary plugging effect, and guidance of temporary plugging and acidizing fracturing construction. Parameter design has positive significance for improving the success rate of temporary plugging reconstruction.

The technical scheme that the present invention adopts is such:

An oil and gas well hole and fracture temporary plugging experiment device, including a transparent wellbore and a funnel installed on the top of the wellbore, a number of round holes and rectangular holes are opened in different positions on the wellbore, and an outlet pipe is directly installed at each round hole, and each First install a flat fracture device at the first rectangular hole, and then install an outlet pipe at the end of the flat fracture device. Each outlet pipe and flat fracture device are made of transparent materials, and a water injection port is also set on the upper part of the wellbore. Temporary blocking agent is contained in the funnel. Preferably, an outlet valve is respectively installed on each outlet pipe.

When conducting the temporary plugging experiment, firstly, according to the experimental needs, open the first outflow pipe, the second outflow pipe, the third outflow pipe, the fourth outflow pipe, the fifth outflow pipe, the sixth outflow pipe, the seventh outflow pipe One or several of the outflow pipes, then open the water injection port, continuously inject water into the device, then open the funnel valve, inject temporary blocking agent into the device, observe the movement of the temporary blocking agent, record the first outflow pipe, the second The flow data of the outflow pipe, the third outflow pipe, the fourth outflow pipe, the fifth outflow pipe, the sixth outflow pipe and the seventh outflow pipe can realize temporary blockage simulation. The outflow valve can control the opening and closing of the opened outflow pipe, and is used to simulate the temporary plugging experiment under the combination conditions of different diameter outflow pipes and cracks.

Preferably, each of the circular holes has a different size, and each of the rectangular holes has a different size. Different circular hole sizes can simulate different perforation hole diameters, and different rectangular hole sizes can simulate different fracture sizes near the wellbore.

As a preference, a funnel valve is installed at the lower end of the funnel. The funnel valve is used to control whether to inject temporary plugging agent.

In summary, owing to adopting above-mentioned technical scheme, the beneficial effect of the present invention is:

(1) The wellbore, each outflow pipe, and the flat fracture device of the device are made of transparent materials to realize the visualization of the temporary plugging effect of the temporary plugging agent;

(2) The manufacturing cost of the whole device is low, the experimental operation is simple, and the later maintenance is convenient;

(3) By designing different numbers and sizes of outlets and plate fractures, the temporary plugging effect under various formation conditions can be simulated and studied.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the embodiment of the present invention;

Fig. 2 is a front structural schematic diagram of an embodiment of the present invention.

Fig. 3 is a schematic diagram of cracks in a flat plate according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a wellbore according to an embodiment of the present invention.

As shown in the figure: 1 is the funnel, 2 is the funnel valve, 3 is the water injection port, 4 is the first outflow pipe, 5 is the second outflow pipe, 6 is the third outflow pipe, 7 is the plate crack, 8 is the second Four outflow pipes, 9 is the fifth outflow pipe, 10 is the sixth outflow pipe, 11 is the seventh outflow pipe, 12 is the wellbore, 41 is the first outflow valve, 51 is the second outflow valve, 61 is The third outflow valve, 81 is the fourth outflow valve, 91 is the fifth outflow valve, 101 is the sixth outflow valve, 111 is the seventh outflow valve.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is described in detail.

Example:

As shown in Figures 1, 2, 3, and 4, an experimental device for temporary plugging of holes and fractures in oil and gas wells includes a transparent wellbore 12 and a funnel 1 installed on the top thereof. There are different circular holes and a rectangular hole, and the outflow pipes are directly installed at each round hole, which are respectively the first outflow pipe 4, the second outflow pipe 5, the third outflow pipe 6, the fifth outflow pipe 9, the first outflow pipe Six outflow outlet pipes 10, the seventh outflow outlet pipe 11, a flat plate crack 7 is installed at each rectangular hole place, and a fourth outflow outlet pipe 8 is installed at the end of the flat plate slit 7, and each outflow outlet pipe (4, 5, 6, 9 , 10, 11) and the flat fracture 7 are made of transparent materials, and the top of the shaft 12 is also provided with a water injection port 3. An outlet valve is respectively installed on each outlet pipe, respectively the first outlet valve 41, the second outlet valve 51, the third outlet valve 61, the fourth outlet valve 81, the fifth outlet valve 91, the sixth outlet valve The outlet valve 101 and the seventh outlet valve 111 . The positions and sizes of the round holes and rectangular holes are different, so that the temporary blocking effect under various bottom conditions can be simulated. A funnel valve 2 is installed at the lower end of the funnel 1 .

Claims (4)

1. An experimental device for temporary plugging of holes and fractures in oil and gas wells, characterized in that: it includes a transparent wellbore (12) and a funnel (1) installed on the top of the wellbore (12), and a water injection port (3) is also set on the top of the wellbore (12). A number of round holes and rectangular holes are set in different positions on the wellbore (12). Outflow pipes are directly installed at each round hole, and a flat fracture device is installed at each rectangular hole, and then the outlet pipe is installed at the end of the flat fracture device. Both the outlet pipe and the flat fracture device are made of transparent materials, and the upper part of the wellbore is also provided with a water injection port. 2. An experimental device for temporary plugging of holes and fractures in oil and gas wells according to claim 1, characterized in that: each outlet pipe is respectively equipped with an outlet valve. 3. An experimental device for temporary plugging of holes and fractures in oil and gas wells according to claim 1 or 2, characterized in that: each of the circular holes has a different size, and each of the rectangular holes has a different size. 4. An oil and gas well hole and fracture temporary plugging experimental device according to claim 1 or 2, characterized in that: a funnel valve (2) is installed at the lower end of the funnel (1).