Oil-and-gas stratum splitting method

FIELD: oil-and-gas field development.

SUBSTANCE: method involves forming continuous disc-shaped slot in well by successive blasting gunpowder charges along with increasing power thereof in trinitrotoluol equivalent from explosion set to explosion set as slot length increases and strengthening the slot. The slot is formed so that aperture and radius thereof are related by analytical correlation.

EFFECT: increased ability of oil and gas extraction.

3 cl, 2 dwg

 

The invention relates to improving the extraction of oil and gas in the development of oil and gas fields. We and abroad preferential developed methods of fracturing with vertical cracks in relatively thick layers. This was promoted by the mining and geological conditions and the ease of creating a vertical slots in conditions exceeding the vertical stress above the horizontal. In low-power and medium-power gas reservoirs with low permeability and viscous oil under hydrostatic stress distribution in the subsurface vertical, artificially constructed cracks ineffective and short-lived. The closest analogue is a method of hydraulic fracturing jets of perforated pipes carrying out the vertical gap (U.S. Pat. 93/04268, 6 E 21 In 43/26, "Method of hydraulic fracturing" priority 16.04.91,) authors: Jones, Lloyd, Garner and others, adapted and effective frac thick layers and in the near zone of borehole array.

Known hydraulic fracturing according to the method Sattarov MS (Sattarov MS, Pat. No. 2071557, 6 E 21 In 43/27, with priority 11.02.93, BI No. 1, 10.01.97).

The main drawbacks are:

jumbled education zone cracks with opening of several millimeters and, therefore, shallow penetration in the array (1-2 m);

- no wrong is Yunosti in formation fracturing, and vertical fracturing is limited and even the capacity of the reservoir;

- the complexity of the method: a preliminary pressure of the working fluid exceeds the formation, pairwise blasting charges (secondary and primary).

Force, pushing the banks of the cracks, is the working fluid that is dispersed in the well explosion, which quickly goes out because of the hydraulic resistance in the cracks (narrowing to the top, the roughness of the walls, change of direction etc). Therefore, regardless of the power of the explosion cracking penetrates deep into the array at 1-2 m during the opening of cracks in a few millimeters. When the crack opening is significantly larger cracks are formed on dozens of meters deep.

Hydraulic calculations of the velocity of the fluid in the cavity cracks and pressure on the walls of the wells caused by the weight of CENTURIES and its capacity allowed us to find the optimal value of these parameters. With an initial guide cavity with opening of 5 m, crack growth covers a zone with a radius of 42 m and average disclosure cavity 3-4 m crack growth stops as soon as the speed of the fluid in the fracture does not provide pressure on the wall equal to the effective stress in the reservoir. Naturally, further opening at the mouth of the guide cracks creates an increased length of GI is orasrv.

The aim of the invention is to significantly improve the extraction of oil and gas from the bowels. This goal is achieved as follows.

1. Way hydraulic splitting of oil and gas formation in low-power and medium-power reservoirs differs from the well creates a solid disc-shaped fixed the crack with a radius related to the disclosure slit Δ value

where ν is the Poisson's ratio,

E - the modulus of elasticity

σeff- effective stress in the reservoir, kg/cm2,

L is the radius of the slit,

deeffective hydraulic diameter of the slit, de=2.

2. Way hydraulic splitting according to claim 1 characterized in that in the vicinity array on a path crossing the surface of the wells with the average plane of the oil and gas reservoir originally constructed mechanically guide the Ironman slot on the depth of discharge of the vertical stresses of borehole array.

3 Way hydraulic splitting according to claim 1 characterized in that gap, including the original part of the building plots corresponding to the powder explosive charge TNT equivalent, increasing as the distance of the slit.

Identified distinctive features not found in the known technical solutions, therefore, offer UEMOA technical solution meets the criterion of "significant differences".

The proposed method of increasing the recovery of oil and gas from the subsurface is implemented as follows. Originally from well 1 (figure 2) disc-shaped saw with telescopic nominated cutters, deepening into an array, constructed along the contour of intersection of the surface of the well layer 2 guide Ironman slot 4, as shown in figure 2, the depth of 0.2 m and the opening width of several centimeters, for example 5 to see If the hole is perpendicular to the horizontal layer, the electric gap in the plan will have the shape of a circle, otherwise the shape of the ellipse. Guide Ironman slot is constructed approximately in the middle of the layer thickness, so the borehole intersects with the median plane of the layer. The undercut 4 (figure 2) is the pilot for the subsequent construction of the slit 3, depicted in figure 1, sections 5, 6 and 7 (figure 2).

The next stage is lowered into the well hemispherical screen in the form of a ring-time actions with evenly placed on it powder explosive charge. The screen serves as a hub explosive energies and in complex with the finished Ironman slit determines the direction of further destruction of the array by splitting and retraction of the crack edges fluids to the estimated parameters. If well prepared for blasting is not filled with water, it is filled up to the wellhead. Posledovatel the Noah blasting powder charges, increasing from series to series, allow you to build 3 crack (figure 1) plots of 15 m each, up to a limit value of the charge weight 0,10 kg 0.15 kg and 0.25 kg of This technology allows you to build a continuous slot with a radius of 42 m and the average splitting 3-4 cm

The final stage of construction of the slit 3 (figure 1) is pinning it against the pressing force during operation. There are many ways of fastening slits, for example, by chemical means through the discharge quickly coagulating solutions with the formation of a solid porous structures. The most cheap and simple is how they are placed in the cracks of the large sand fractions with the same grain size, 8 in figure 2. As a result of hydraulic fracturing on the banks of the cracks appear small cracks surrounding the crack as a result of the destruction of interporous jumpers rocks and merge them. The appearance of this area 9 shown in figure 2, is inevitable and its distribution ranges from 5-50 see better Than made a slit with a large coefficient of the blast, the less damage is observed in its vicinity, and those longer than its and without jumper she made.

Creating deep cracks in various mining and geological conditions using the energy of the explosion fully described in monographs Dr. Wiertsema (Management deformirovny the receiving undermined rocks deep cracks." Stroiizdat, 1983, Ed. "Nedra", 1995).

In addition, the technique and technology of hydraulic fracturing fully understood and mastered here and especially abroad, in the United States. ("Oil industry"overview "Equipment and technology for hydraulic fracturing abroad" VIP(101), M, 1985).

To create a guide Ironman slit from a well with a depth of 20 cm mechanised way, there is a special drill attachment with telescopic growing body.

The enhancement layer, processed by the proposed method, measured by the ratio of the flow rates of the well before and after use of the method of deep cleavage oil reservoir, taken from specific fields. For deposits, lying horizontally at a depth of 2 km with pressure oil reservoir 27 MPa, with a rock pressure of 47 MPa hydrostatic pressure of 20 MPa, the relationship of flow rate after the application of the method of splitting the flow rate q to the q0before applying it is

according to (michaluk AV "Torpedo and impulsive hydraulic fracturing", Kiev: Naukova Duma, 1986, str).

Because fracturing takes the form of an ellipse instead of a rectangle (in the vertical section of the reservoir), on the basis of proportionality of the flow rate of the square cross sections of drains is given radius of drainage will be less r< Rn. It is determined from the ratio

S/S1=Rn/r,

where S is the area of the vertical cross section of the rectangular slit shape for Rn,

Rn is the radius of the path of power,

S1- the area of the vertical section of the slot of the fracture

r - the radius of the well fracturing.

Where r=(S1/S)*Rn=of 0.786*42=33 m

Substituting in the above-mentioned ratio of the flow rates of the well data of full-scale tests on the oil fields of Western Siberia, received

Comparative calculations show that the production of the well with a deep cleavage layer on the order increases and more effectively than any of the known methods.

Instead of many small cracks tend to be created in the near zone and quickly colibacilosis outside, there is a splitting seam slit, which is perfect Drenai, serving as a battery and a kind of pump that drives the oil on a continuous slit under pressure in the direction of wells under conditions of depression. The pressure increase in the well press the oil from the cracks in the host rock. Thus, as a result of deep pumping cleaned pores and flow channels from rock trivia, wax, clay particles and the like, providing high productivity wells.

1. Way hydraulic Rasse the population of oil and gas formation in low-power and medium-power reservoirs, including the creation of well solid disc-shaped crack serial blasting powder charges, the mass of TNT increase from series to series as the length of the slit, and the slit creates such a way that the disclosure of the slit (Δ) and its radius (L) connected by the relation

▵/L=[0,1(1+ν)σeff·L]/Ede,

where ν is the Poisson's ratio of the reservoir rock;

σeff- effective stress in the formation rock, kg/cm2;

E - the modulus of elasticity of the reservoir rock;

deeffective hydraulic diameter of the slit,

then the crack is fixed.

2. Way hydraulic splitting according to claim 1, characterized in that in the vicinity array on a path crossing the surface of the wells with the median plane of the oil and gas reservoir originally constructed mechanically guide the Ironman slot on the depth of discharge of the vertical stresses of borehole array.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: method includes placement of deep operation body in perforation zone, capable of forming pressure pulses via remote initiation of gas mixture explosions. Depression of bed is performed by lowering liquid level in a well, forming a certain volume of explosive gas mixture in deep body, performing multiple effect on bed without raising of body until well product influx increases. Explosion pressure is set on basis of hydrostatic pressure of well liquid and volume of explosive gas mixture on basis of table provided in description.

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