CN-119203806-B - Reservoir matrix fracturing fluid filtration loss calculation method, device and computer equipment

CN119203806BCN 119203806 BCN119203806 BCN 119203806BCN-119203806-B

Abstract

The embodiment of the specification provides a reservoir matrix fracturing fluid filtration loss calculation method, a device and computer equipment, which relate to the technical field of petroleum exploitation, and the method comprises the steps of acquiring pressure data of each pressure measuring point of a rock core in the process of a reservoir core fracturing fluid damage experiment; the method comprises the steps of determining the damage length of fracturing fluid of a reservoir core according to pressure data, calculating the parameter of the permeability of fracturing fluid of a reservoir matrix along with the invasion depth according to the damage length of the fracturing fluid, calculating the fluid loss depth of the fracturing fluid of the reservoir according to the parameter of the density of the fracturing fluid, the viscosity of the fracturing fluid and the permeability of the fracturing fluid of the reservoir matrix along with the invasion depth, and calculating the total fluid loss of the fracturing fluid according to the average seam height and seam length of a hydraulic main seam, the average seam height and seam length of a branch seam and the fluid loss depth of the fracturing fluid of the reservoir. The method can take the influences of factors such as the change of the permeability of the fracturing fluid of the reservoir matrix along with the invasion depth, the density of the fracturing fluid, the viscosity of the fracturing fluid and the like into consideration, and can rapidly and accurately calculate the filtrate loss of the fracturing fluid of the reservoir matrix.

Inventors

LI BEN
WANG YUN
ZHANG FENG
YANG KAI
ZUO JIE
YAO ERDONG
LIANG TIANBO
HU XIAODONG
XU ZHENGJIE
LI HUI
ZHOU FUJIAN
YANG XIWU
LI YESONG
ZHOU LIBO
Pu Shengxian
JIA HAILIANG

Assignees

中国石油大学(北京)

Dates

Publication Date: 20260505
Application Date: 20240730

Claims (8)

1. A reservoir matrix fracturing fluid loss calculation method, characterized in that the method comprises: acquiring pressure data of each pressure measuring point of a rock core in the process of a reservoir rock core fracturing fluid damage experiment; determining the damage length of fracturing fluid of the reservoir core according to the pressure data; calculating the variation parameter of the permeability of the fracturing fluid of the reservoir matrix along with the invasion depth according to the damage length of the fracturing fluid; According to the parameters of the fracturing fluid density, the fracturing fluid viscosity and the reservoir matrix fracturing fluid permeability along with the invasion depth, the reservoir fracturing fluid filtration depth is calculated, wherein the reservoir fracturing fluid filtration depth is: Wherein, the The depth of the fracturing fluid is cm; G/cm 3 as the density of the fracturing fluid; The permeability of the fracturing fluid at the position of the invasion depth i after invasion injury is 10 -3 μm 2 , i is the invasion depth, cm; is the fluid pressure in the seam, MPa; is reservoir pore pressure, MPa; viscosity of fracturing fluid, mpa.s; 10 -3 μm 2 for reservoir matrix permeability; The porosity-permeability regression coefficient of the reservoir matrix is dimensionless; Calculating to obtain the total fluid loss of the fracturing fluid according to the average seam height and seam length of the hydraulic main seam, the average seam height and seam length of the branch seam and the reservoir fracturing fluid loss depth; According to the average seam height and seam length of the hydraulic main seam, the average seam height and seam length of the branch seam and the reservoir fracturing fluid filtration depth, calculating to obtain the total filtration of the fracturing fluid, and further: Wherein, the The total filtrate loss of the fracturing fluid is m 3 ; The depth of the fracturing fluid is cm; 10 -3 μm 2 for permeability at the i-site of penetration depth; The average seam height of the hydraulic main seam is m; the length of the main seam is the length of the hydraulic main seam, m; The average seam height of the branch seam 1 is m; the length of the branch seam is 1 seam length, m; The average seam height of the branch seam 2 is m; the length of the branch seam is 2 seams, m; The average seam height of the branch seam n is m; The length of the branch seam n is m.
2. The method of claim 1, wherein determining a fracturing fluid damage length of the reservoir core from the pressure data further comprises: acquiring pressure data of each pressure measuring point on a core holder under the conditions of initial inlet end pressure, initial outlet end pressure and preset fracturing time in a fracturing fluid damage experiment; Calculating a pressure gradient difference coefficient of each pressure measuring point according to the pressure data of each pressure measuring point, the initial inlet end pressure and the initial outlet end pressure; Judging whether pressure measuring points exist in the pressure measuring points or not, wherein the pressure gradient difference coefficient meets the preset condition; when a pressure measuring point with the pressure gradient difference coefficient meeting the preset condition exists, determining the damage length of the fracturing fluid according to the pressure measuring point with the pressure gradient difference coefficient meeting the preset condition and the repeated times of the damage experiment of the fracturing fluid; And when all the pressure measuring points do not meet the preset conditions, updating the initial inlet end pressure, and repeating the fracturing fluid damage experiment for the preset fracturing time until the pressure measuring points with the pressure gradient difference coefficients meeting the preset conditions exist.
3. The method of claim 2, wherein the pressure gradient difference coefficient is calculated according to the formula: Wherein, the The pressure gradient difference coefficient of the j-th pressure measuring point is dimensionless; the pressure gradient corresponding to the jth pressure measuring point is MPa/cm; the pressure gradient between the outlet end and the inlet end of the core holder is MPa/cm; Wherein, the The pressure of the j-th pressure measuring point is MPa; The pressure is the pressure of the j-1 th pressure measuring point and MPa; the length of the core between two adjacent pressure measuring points is cm; The pressure at the inlet end of the core holder is MPa; the pressure of the outlet end of the core holder is MPa; Is the length of the reservoir core, cm.
4. The method of claim 3, wherein when there is a pressure measurement point where the pressure gradient difference coefficient satisfies a preset condition, determining the fracture fluid injury length according to the pressure measurement point where the pressure gradient difference coefficient satisfies the preset condition and the number of fracture fluid injury experiment repetitions is: Wherein, the N is the number of repeated fracturing fluid injury experiments; Is the length of the core of the reservoir, cm; The length of the core between two adjacent pressure measuring points is cm, and j is the number of the j-th pressure measuring point.
5. A method according to claim 3, wherein the initial inlet-end pressure is updated when none of the pressure taps meet a preset condition, further comprising: And when the fracturing duration reaches the preset pressure time in the previous fracturing fluid damage experiment, the pressure of the outlet end of the core holder updates the pressure of the initial inlet end.
6. The method of claim 1, wherein calculating a reservoir matrix fracturing fluid permeability as a function of invasion depth from the fracturing fluid damage length further comprises: Wherein, the 10 -3 μm 2 For permeability at the i-site of penetration depth; 10 -3 μm 2 for reservoir matrix permeability; Is the damage rate of the fracturing fluid, and has no dimension; the damage length of the core fracturing fluid is cm; The specific calculation formula is as follows: i is the depth of penetration, cm.
7. A reservoir matrix fracturing fluid loss calculation device, comprising: the acquisition module is used for acquiring pressure data of each pressure measuring point of the rock core in the process of a reservoir rock core fracturing fluid damage experiment; the determining module is used for determining the damage length of fracturing fluid of the reservoir core according to the pressure data; the permeability calculation module is used for calculating the parameters of the permeability of the fracturing fluid of the reservoir matrix along with the invasion depth according to the damage length of the fracturing fluid; The fluid loss depth calculation module is used for calculating the reservoir fracturing fluid loss depth according to the parameters of the fracturing fluid density, the fracturing fluid viscosity and the reservoir matrix fracturing fluid permeability along with the invasion depth, wherein the reservoir fracturing fluid loss depth is as follows: Wherein, the The depth of the fracturing fluid is cm; G/cm 3 as the density of the fracturing fluid; The permeability of the fracturing fluid at the position of the invasion depth i after invasion injury is 10 -3 μm 2 , i is the invasion depth, cm; is the fluid pressure in the seam, MPa; is reservoir pore pressure, MPa; viscosity of fracturing fluid, mpa.s; 10 -3 μm 2 for reservoir matrix permeability; The porosity-permeability regression coefficient of the reservoir matrix is dimensionless; The total fluid loss calculation module is used for calculating and obtaining the total fluid loss of the fracturing fluid according to the average seam height and seam length of the hydraulic main seam, the average seam height and seam length of the branch seam and the reservoir fracturing fluid loss depth based on the following formula: Wherein, the The total filtrate loss of the fracturing fluid is m 3 ; The depth of the fracturing fluid is cm; 10 -3 μm 2 for permeability at the i-site of penetration depth; The average seam height of the hydraulic main seam is m; the length of the main seam is the length of the hydraulic main seam, m; The average seam height of the branch seam 1 is m; the length of the branch seam is 1 seam length, m; The average seam height of the branch seam 2 is m; the length of the branch seam is 2 seams, m; The average seam height of the branch seam n is m; The length of the branch seam n is m.
8. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 6 when the computer program is executed.

Description

Reservoir matrix fracturing fluid filtration loss calculation method, device and computer equipment Technical Field The embodiment of the specification relates to the technical field of petroleum exploitation, in particular to a reservoir matrix fracturing fluid loss calculation method, a device and computer equipment. Background In the hydraulic fracturing process of a reservoir, the fluid loss of the fracturing fluid is one of important parameters for evaluating the efficiency of the fracturing fluid and the size of a joint. First, the fracturing fluid loss will cause a change in the effective fracturing fluid volume within the hydraulic fracture, i.e., the effective fracturing fluid volume is the difference between the pumped fracturing fluid volume and the fracturing fluid loss volume. The ratio of the volume of the fracturing fluid in the seam to the volume of the pumped fracturing fluid can be defined as the efficiency of the fracturing fluid, and the greater the efficiency of the fracturing fluid in the seam, the higher the efficiency of the seam making. Therefore, the effective evaluation of the fracturing fluid filtration loss is beneficial to the fine design of the fracturing fluid quantity so as to construct the fracturing fluid quantity reasonably in design, thereby realizing the target reconstruction volume of the reservoir fracture. Second, the fluid loss of the fracturing fluid causes a change in fluid pressure in the seam. Under the condition of the same pumping displacement, the larger the fluid loss of the fracturing fluid is, the smaller the fluid pressure in the seam is, the smaller the seam width of the hydraulic fracture is, the larger the migration resistance of the propping agent is easily caused, and finally, the diversion capacity of the fracturing fracture cannot meet the high-efficiency production requirement of oil gas in a reservoir. For reservoirs, the fluid loss of fracturing fluid is mainly affected by factors such as rock matrix permeability, porosity, intra-fracture pressure and the like. In the prior art, a calculation method for reservoir fracturing fluid filtration loss is lacking. In view of this, the present description embodiments are directed to a reservoir matrix fracturing fluid loss calculation method, apparatus, and computer device. Disclosure of Invention In view of the foregoing problems in the prior art, an object of an embodiment of the present disclosure is to provide a method, an apparatus, and a computer device for calculating a fluid loss of a fracturing fluid of a reservoir matrix, so as to solve the problem that a method for calculating the fluid loss of the fracturing fluid is lacking in the prior art. In a first aspect, embodiments of the present disclosure provide a reservoir matrix fracturing fluid loss calculation method, including: acquiring pressure data of each pressure measuring point of a rock core in the process of a reservoir rock core fracturing fluid damage experiment; determining the damage length of fracturing fluid of the reservoir core according to the pressure data; calculating the variation parameter of the permeability of the fracturing fluid of the reservoir matrix along with the invasion depth according to the damage length of the fracturing fluid; According to the parameters of the fracturing fluid density, the fracturing fluid viscosity and the reservoir matrix fracturing fluid permeability along with the invasion depth, the reservoir fracturing fluid filtration depth is calculated, wherein the reservoir fracturing fluid filtration depth is: Wherein D loss is the fracturing fluid filtration depth, cm, ρ fluid is the fracturing fluid density, g/cm 3;Km (i) is the permeability of the fracturing fluid at the position of the invasion depth i after invasion injury, 10 -3μm2, i is the invasion depth, cm, P fracture is the in-seam fluid pressure, MPa, P formation is the reservoir pore pressure, MPa, μ fluid is the fracturing fluid viscosity, mPa.s, K rock is the reservoir matrix permeability, 10 -3μm2, a and b are the reservoir matrix porosity-permeability regression coefficients, and the method is dimensionless; and calculating to obtain the total fluid loss of the fracturing fluid according to the average seam height and seam length of the hydraulic main seam, the average seam height and seam length of the branch seam and the reservoir fracturing fluid loss depth. Specifically, determining a fracturing fluid damage length of the reservoir core according to the pressure data, further comprises: acquiring pressure data of each pressure measuring point on a core holder under the conditions of initial inlet end pressure, initial outlet end pressure and preset fracturing time in a fracturing fluid damage experiment; calculating to obtain a pressure gradient difference coefficient of each pressure measuring point according to the pressure data of each pressure measuring point, the initial inlet end pressure and the initial outlet end pres