The way to create low cost in-situ grid field development petroleum or other subsurface fluids (options)

 

The invention relates to the oil and gas industry, can be used to significantly reduce the cost of building the grid design and the unit cost of production, and also when removing other underground fluids. The technical result - the reduction of the cost of most capital-intensive part of the development of oil and gas resources - drilling field development wells and obtaining low-cost grids development of secondary faces inflow instead of the traditionally used grids of vertical wells, reducing the unit cost of production. The inventive method for plot development determines the cost of drilling a vertical borehole, vertical-horizontal wells, by performing the secondary faces inflow from horizontal wells. Determine the length of the horizontal well. Calculate the optimal density of shallow vertical wells. Determine the criterion of economic efficiency creating a reservoir grid using analytical expressions. When the value of the criterion of economic efficiency is less than 1 square field is divided into a rectangular strip of fixed width equal to twice previously about what each other lay and drill triple vertical-horizontal wells. Their vertical trunks open reservoir for serial execution of exploration and mining functions. Two horizontal section, equal in length to half the width of the strip, drill into the productive formation in diametrically opposite directions to each other across the width of the strip. On the same fixed distance from each other in the horizontal section perform the secondary faces of the flow in different ways. 3 c.p. f-crystals, 3 ill.

The invention relates to the oil and gas industry, can be used to significantly reduce the cost of building the grid design and the unit cost of production, and also when removing other underground fluids.

There is a method in which in the system of oil field development traditional grid design replaces placed on the square in horizontal wells, designed to increase production wells, extraction of oil from the reservoir and reduce the unit cost of production, including drilling of horizontal wells (GS) and receiving horizontal wellbore large extent, productive along its entire length (which was the basis of the concept of multiple ascending Debi-2.5 times the average in Russia and up to 4-5 times in the USA and Canada, an important result of this method (Development of oil and gas fields. Status, problems and ways of their solution. -M.: VNIIEM, 1996, page 242). One disadvantage of this method is due to the known reasons (the negative effects of drilling mud on the productivity of wells, deformation effects in the near-wellbore zone, the anisotropy of the reservoir), the reduced productivity per meter horizontal wellbore compared to the vertical. As a result, in horizontal wells is not obtained in a high increase of the flow rate, which was expected based on the ratio of length of productive intervals of horizontal wells.

Another disadvantage of this method is the high cost of drilling horizontal wells compared to vertical: the ratio of the value of the HS and VS reaches in Russia 2-3, and in countries with the greatest experience and high technology HS (USA, Canada) - 1,25-1,5.

Know of any other way to create grids of oil field development (adopted as a prototype), including field development uniform square grid of vertical wells, the drilling of the reservoir and creating a secondary intervals inflow of liquids which for nearly a hundred years, designed and developed (with rare exceptions) all oil and gas fields of Russia, CIS countries and other oil producing countries. It is established that a uniform square grid in many properties (providing additional exploration, simplicity even further compaction, stability in time, the possibility of predicting and controlling the development, possibilities of mathematical modeling) is preferable, and it laid the basis for the development of the largest fields in Russia and abroad (C. D. Lysenko. "Oil exploration", Theory and practice, M., Nedra, 1996, pages 132-135, C. D. Lysenko, "Innovative development of oil fields", M., Nedra, 2000, page 20-25, 68-69, 314).

Continued practice of development and improvement of methods of oil field development systems, based on a uniform square meshes well placement and spacing of the flow), which fully confirmed the positive quality of this mesh.

The disadvantage of this method is the high cost of the complex work associated with penetration into the formation, especially the passage of drilling a huge (multi-kilometer) non-productive complex of rocks, the eve ENT of the upper part of the oil reservoir - the perforated interval, which is a few meters or (rarely) two or three dozen meters.

Another disadvantage of the traditional method is the need to separate drilling expensive wells for each face (interval inflow (PI)) of the generated mesh. Both of the mentioned factors lead to high unit costs for creating a productive slaughter and FE, which is a major limitation for drilling a large number of wells and the creation of high-density grids development of oil fields, especially in the context of the great depths, the share of which naturally increases in oil and gas industries. The next disadvantage of this method is a natural concomitant increase in the value of the vertical wells and declines in productivity with increasing depth of the productive layers, contributing to a sharp decrease in the return to the traditional grid.

The technical result achieved by the invention, is to reduce the cost of the most costly part of the development of oil and gas resources - drilling field development wells and obtaining low-cost grids development of secondary faces of the flow, rather than the traditional p is glycaemia in the achievement of the technical result in the way to create a square low-cost in-situ grid field development, for plot development determines the cost of drilling a vertical borehole, vertical-horizontal wells, by performing the secondary faces of the influx of horizontal wells to determine the length of the horizontal wells, calculate the optimal density of shallow vertical wells, determine the criterion R economic efficiency of the in-situ grid aswhenKf= (2Lg)/(2-1), where- the ratio of the value of one of the secondary face of the influx of horizontal wells to the cost of a single vertical borehole; Ssoptimal density of laying a square grid of vertical wells, m; F - area strip field m2;in-the cost of one vertical well on the field, RUB;- the constant in the formula for calculation of oil recovery factor; Ct- the market price of oil, RUB/t;
GFgeological reserves of oil on the area F,t;
Lg- the length of the horizontal wells, m;
- the ratio of the value of the vertical-horizontal squaring field is divided into a rectangular strip of fixed width, equal to twice the previously defined length of horizontal wells, an average line width of each strip at a fixed distance from each other, lay and drill triple vertical-horizontal wells, vertical trunks which reveal the reservoir for serial execution of exploration and mining functions, and two horizontal section, equal in length to half the width of the strip, drill into the productive formation in a diametrically opposite direction to each other across the width of the strip, then on the same fixed distance from each other in the horizontal section perform the secondary faces of the influx.

This technical result is achieved in the method of creating a square-situ grid field development petroleum or other subsurface fluids, which for plot development determines the cost of drilling a vertical borehole, vertical-horizontal wells, by performing the secondary faces of the influx of horizontal wells, determine the length of horizontal wells, calculate the optimal density of vertical wells, determine the criterion R economic efficiency of the in-situ grid as
- the ratio of the value of one of the secondary face of the influx of horizontal wells to the cost of one vertical well;
Ssoptimal density of laying a square grid of vertical wells, m;
F - the area of the strip fields, m2;
Within-the cost of one vertical well on the field, RUB;
- the constant in the formula for calculation of oil recovery factor;
Witht- the market price of oil, RUB;
GF2geological reserves of oil on the area F, t;
Lg- the length of the horizontal wells, m;
- the ratio of the value of the vertical-horizontal wells to the cost of a vertical well,
and when the value of the criterion of economic efficiency is less than 1 square field is divided into a rectangular strip of fixed width equal to twice the previously defined length of horizontal wells, an average line width of each strip at a fixed distance from each other and lay Buryats triple vertical-horizontal wells, vertical trunks which reveal the reservoir for the serial issue, wrath in impervious roof in diametrically opposite directions to each other across the width of the strip, then on the same fixed distance from each other in the horizontal section perform secondary faces inside the reservoir.

The same technical result is achieved in the method of creating a rectangular reservoir grid field development petroleum or other subsurface fluids, which for plot development determines the cost of drilling a vertical borehole, vertical-horizontal wells, by performing the secondary faces of the influx of horizontal wells, determine the length of horizontal wells, calculate the optimal density of vertical wells, determine the criterion R economic efficiency of the in-situ grid as
when
Kf= (2Lg)/(2-1), SCR= Ss/n
where- the ratio of the value of one of the secondary face of the influx of horizontal wells to the cost of one vertical well;
SCRoptimal density of a rectangular grid of vertical wells;
Sabout the of an unforgettable, m2;
Within- the cost of one vertical well on the field, RUB;
- the constant in the formula for calculation of oil recovery factor;
Ct- the market price of oil, RUB/t;
GFgeological reserves of oil on the area F, t;
Lg- the length of the horizontal wells, m;
- the ratio of the value of the vertical-horizontal wells to the cost of a vertical well;
n - additional secondary faces inflow, PCs

and when the value of the criterion of economic efficiency is less than 1 square field is divided into a rectangular strip of fixed width equal to twice the previously defined length of horizontal wells, an average line width of each strip at a fixed distance from each other and lay Buryats triple vertical-horizontal wells, vertical trunks which reveal the reservoir for serial execution of exploration and mining functions, and two horizontal section, equal in length to half the width of the strip, drill into the productive formation in a diametrically opposite direction to each other across the width of the strip, next to the same pixaround the RNO placed additional secondary faces of the inflow.

The invention is illustrated by drawings, where Fig. 1 shows a diagram of the drilling unit of the well at the location of the horizontal sections in the reservoir, Fig. 2 - scheme of drilling a single hole at the location of the horizontal section in an impenetrable roof of Fig. 3 - grid scheme of development of the field.

The method is as follows.

Selected for the development of the field determines the cost of drilling a vertical borehole, vertical-horizontal wells, by performing the secondary faces of the influx of horizontal wells, determine the length of horizontal wells Lt. Next, calculate the optimal density of Ssvertical wells and determine the criterion R economic efficiency of the in-situ grid as
when
Kf= (2Lg)/(2-1),
where- the ratio of the value of one of the secondary face of the influx of horizontal wells to the cost of one vertical well;
Ssoptimal mesh density vertical wells;
F - area strip field;
WithinI calculate the oil recovery factor;
Witht- the market price of oil;
GFgeological reserves of oil on the area F;
- the ratio of the value of the vertical-horizontal wells to the cost of a vertical well.

The value of the constantis 0.11.

When the value of the criterion for the effectiveness of R less than 1, the reservoir area is divided into rectangular strips of fixed width equal to twice the previously defined length of horizontal wells. On an average line width of each strip at a fixed distance from each other equal to the square root from the optimal density vertical wells Ssestablish and drill triple vertical-horizontal wells (HCV) 1, vertical sections 3, 4 open the reservoir 6. Two diametrically oppositely directed horizontal section 2 is carried out in the reservoir (for option 1). These plots have a total length 2Lgwhile Lg- the length of the horizontal section (SU) horizontal wells - optimal for data geological and mechanical conditions and the company (the company), which manufactures drilling operations. In the absence of the necessary data to directly determine the Value of Lglargely depends on the condition and quality drilling equipment and technology, professional-level drill crews and specialists drilling company, gained experience drilling horizontal wells - factors, which in recent years are developing rapidly. Depending on these factors, the optimal length of the horizontal sections of the already reach many hundreds and the first thousand meters, but the pace of technology development drilling horizontal sections (SU) so high (some wells already exceeded 10,000 m, while the vertical drilling at more than two thousand years of history has not overcome this level) that in the near future we can expect changes in the direction of increasing the optimal Lg.

Then on the horizontal section of the wellbore to perform secondary faces inflow (HICP) 5.

To perform HICP use low-cost (compared to the cost of drilling vertical and especially horizontal wells) device, which in recent decades has also been extensively updated and improved penetration and reduce the cost. In the running faces of the inflow create based on the combination of technical means is expensive (also compared to vertical wells) devices to perform themselves VZP, in this combination, forming a uniform square grid HICP, there is a special economic law according to which the number of low-cost HICP in-situ combined grid development (vksr) is proportional to the square of the number of cost-HCV:
NVZP=((2Lg)2/F)NGHS2,
where NGHS- the number of low-cost VZP,
NGHSthe number of cost-HCV.

When carrying out variant, in which the horizontal wells are drilled in an impenetrable roof, secondary faces inflow perform inside the reservoir.

For option a rectangular grid development is made between version 1 HICP perform additional n secondary faces of the flow, while the coefficient R is calculated with the following formula:
when
Kf= (2Lg)/(2-1), SCR= Ss/n.
All values in these formulas are the same as previously defined, SCRoptimal density of a rectangular grid of vertical wells.

The method is illustrated by the following example.

The field "M" has a size of 4000

The band is characterized by the following parameters:= 0,0210-4; GF= 4,8l06t; Cin=50l06RUB

The price of a ton of oil acceptedt=3000 rubles/so

The value offor bandwidth equal to 2.

Kf=1500/(2 x 2-l)=500.

With these parameters, the optimal density of conventional nets VS will be equal to
With this optimal density have cost grid SU:
WithSt=(610650106)/(10,2104)=2941,2106RUB,
and the criterion of economic efficiency R

Savings on one band size 6106m2through the use of grid vksr instead of a grid SU with the same density will be ep= 2941,2106-0,642941,2l06= 1058,8106RUB

Savings on Deposit, consisting of 4 lanes, with the up>6RUB

Thus, creating a reservoir grid (vksr) according to the method according to the invention saves 36% of the funds spent on creating traditional uniform square grids drilling vertical wells.

Technological implementation of the claimed method of creating vksr for the above example.

The field "M" has a size (40006000) m including 2Lg=1500m field is divided into 4 bands dimensions (15004000) m

The optimal mesh density SU equal to 10.2104. The number of HCV, revealing the reservoir, as well 12.52. HCV Buryats in the midline along the strip. On the horizontal section length of 1500 m by means of the device according to patent RU 2109129 at a distance from each other equal to 319,4 m, perform the HICP in the number 46,28.

As a result, in the productive stratum receive a grid above the specified density value and the estimated value.


Claims

1. The way to create a square-situ grid field development petroleum or other subsurface fluids, namely, that for plot development determine stoimost inflow from horizontal wells, determine the length of the horizontal wells, calculate the optimal density of shallow vertical wells, determine the criterion R economic efficiency of the in-situ grid as

when
Kf= (2Lg)/(2-1),
where- the ratio of the value of one of the secondary face of the influx of horizontal wells to the cost of one vertical well;
Ssoptimal density of a square grid of vertical wells, m;
F - the area of the strip fields, m2;
Within- the cost of one vertical well on the field, RUB;
is a constant for the calculation of oil recovery factor;
Witht- the market price of oil, RUB/t;
GFgeological reserves of oil on the area F, t;
Lg- the length of the horizontal wells, m;
- the ratio of the value of the vertical-horizontal wells to the cost of a vertical well,
and when the value of the criterion of economic efficiency is less than 1 square field is divided into a rectangular strip of fixed width, RA is sirovina distance from each other and lay Buryats triple vertical-horizontal wells the vertical trunks of which reveal the reservoir for serial execution of exploration and mining functions, and two horizontal section, equal in length to half the width of the strip, drill into the productive formation in diametrically opposite directions to each other across the width of the strip, then on the same fixed distance from each other in the horizontal section perform the secondary faces of the influx.

2. The way to create a square-situ grid field development petroleum or other subsurface fluids, namely, that for plot development determines the cost of drilling a vertical borehole, vertical-horizontal wells, by performing the secondary faces of the influx of horizontal wells, determine the length of horizontal wells, calculate the optimal density of shallow vertical wells, determine the criterion R economic efficiency of the in-situ grid as

when
Kf= (2Lg)/(2-1),
where- the ratio of the value of one of the secondary face of the influx of horizontal wells to wells, m;
F - the area of the strip fields, m2;
Within- the cost of one vertical well on the field, RUB;
is a constant for the calculation of oil recovery factor;
Witht- the market price of oil, RUB/t;
GFgeological reserves of oil on the area F, t;
Lg- the length of the horizontal wells, m;
- the ratio of the value of the vertical-horizontal wells to the cost of a vertical well,
and when the value of the criterion of economic efficiency is less than 1 square field is divided into a rectangular strip of fixed width equal to twice the previously defined length of horizontal wells, an average line width of each strip at a fixed distance from each other and lay Buryats triple vertical-horizontal wells, vertical trunks which reveal the reservoir for serial execution of exploration and mining functions, and two horizontal section, equal in length to half the width of the strip, drill into the impenetrable roof in diametrically opposite directions to each other across the width of the strip, also, at the same fixed distance from the Oia rectangular in-situ grid field development of oil or other fluids, namely, that for plot development determines the cost of drilling a vertical borehole, vertical-horizontal wells, by performing the secondary faces of the influx of horizontal wells, determine the length of horizontal wells, calculate the optimal density of shallow vertical wells, determine the criterion R economic efficiency of the in-situ grid as

when
Kf= (2Lg)/(2-1), SCR= Ss/n
where- the ratio of the value of one of the secondary face of the influx of horizontal wells to the cost of one vertical well;
SCRoptimal density of a rectangular grid of vertical wells, m;
Ssoptimal density of a square grid of vertical wells, m;
F - the area of the strip fields, m2;
Within- the cost of one vertical well on the field, RUB;
is a constant for the calculation of oil recovery factor;
Witht- the market price of oil, RUB/t;
GFgeological reserves of oil on the area F, t is about-a horizontal well to the cost of a vertical well;
n - additional secondary faces inflow, PC,
and when the value of the criterion of economic efficiency is less than 1 square field is divided into a rectangular strip of fixed width equal to twice the previously defined length of horizontal wells, an average line width of each strip at a fixed distance from each other and lay Buryats triple vertical-horizontal wells, vertical trunks which reveal the reservoir for serial execution of exploration and mining functions, and two horizontal section, equal in length to half the width of the strip, drill into the productive formation in diametrically opposite directions to each other across the width of the strip, also, at the same fixed distance from each other in the horizontal section perform the secondary faces of inflow and between them evenly placed additional secondary faces of the inflow.

 

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1 ex, 2 dwg

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3 cl, 2 ex, 1 tbl, 8 dwg

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1 ex, 2 dwg

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2 cl, 2 ex, 1 tbl

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